WO2007119415A1

WO2007119415A1 - Frequency allocation method, detection method, transmission device, and reception device

Info

Publication number: WO2007119415A1
Application number: PCT/JP2007/055486
Authority: WO
Inventors: Jifeng Li; Zheng Zhao
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2006-03-20
Filing date: 2007-03-19
Publication date: 2007-10-25
Also published as: CN101043311B; CN101043311A

Abstract

Provided are a frequency allocation method and a detection method capable of simultaneously obtaining a frequency diversity gain and a time diversity gain. In this method, most of signals transmitted from a plurality of transmission antennas of a transmission device are not overlapped by one another on a frequency region by allocating a frequency for each of the transmission antennas by using one of the following methods: the Distributed-FDMA method for allocating a distributed frequency band, the Localized-FDMA method for allocating a local frequency band, and the Hybrid-FDMA method for allocating a mixed frequency band. Signals transmitted from the transmission antennas are received and the received signals are subjected to a time-space inverse Fourier transform so as to convert the received signal from the frequency region to the time region and perform MIMO detection on the time region, thereby detecting the transmission signals from the transmission antennas.

Description

TECHNICAL FIELD The present invention relates to a frequency allocation method, a detection method, a transmission device, and a reception device.

The present invention relates to a frequency allocation method, a detection method, a transmission device, and a reception device that allocate frequency bands in a mixed manner in an uplink MIMO (Multiple Input Multiple Output) system. For example, the present invention relates to high-speed wireless in various cellular systems. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency allocation method, a detection method, a transmission device, and a reception device applied to an uplink wireless communication system in a communication system and a high-throughput wireless local area network system.

[0002] As the transmission rate of third-generation mobile communication is increased, the duration of each symbol is shortened, so that 3GPP (3rd The proposals for each item of the Generation Partner Project are concentrated on methods using frequency division multiple access (FDMA). In a frequency division multiple access system, the frequency of each user is orthogonal, and the symbol duration of each user's signal does not become shorter as the number of users increases. The impact will never be severe.

[0003] Within the 3GPP organization, some operators have implemented orthogonal frequency division multiple access (OFDMA).

Adopting the Orthogonal Frequency Division Multiplex Access method The advantage is that the spectrum of users using the orthogonal frequency division method partially overlaps, so that the frequency utilization efficiency can be greatly improved, and the same multiple access method as that used for downlink can be used. It is. However, OFDMA needs to be strictly synchronized between users and has a high PAPR (Peak to Average Power Ratio), so it can be used as a user equipment terminal (UE: User Equipment). The demand for the dynamic range of the amplifier used will increase.

[0004] As the discussion on 3GPP uplink multiple access schemes deepens, DistributedFDMA (DFD), which allocates distributed frequencies as a multiple access scheme, is currently being implemented. Most attention has been focused on the MA) method and the Localized FDMA (LFDM A) method in which localized (Localized) frequencies are allocated (see Non-Patent Document 1).

FIG. 1 is a block diagram showing a main configuration of a transmission apparatus that realizes the DFDMA scheme. The bit'repetition unit 11 performs repetition processing on the bits so that diversity transmission can be realized, and the S / P (Serial to Parallel) conversion unit 12 is the bit sequence output from the bit'repetition unit 11 On the other hand, serial Z parallel conversion is performed. The modulation unit 13 modulates the bit sequence after serial Z parallel conversion, the M-point FFT (Fast Fourier Transform) unit 14 performs Fourier transform on the modulated signal, and the mapping unit 15 converts each frequency point. The upper signal is placed on the carrier frequency point at regular intervals. Figure 2 shows how frequency mapping is performed.

[0006] An N-point IFFT (Inverse Fast Fourier Transform) unit 16 performs an inverse Fourier transform process on the modulated signal after mapping, and a CP (Cyclic Prefix) -added Calo unit 17 A cyclic prefix (CP) is added to the converted data block, and the PZS converter 18 performs normal Z serial conversion on the data after the CP addition, and then passes through an antenna (not shown). Send.

FIG. 3 is a block diagram showing a main configuration of a transmission apparatus that realizes the LFDMA scheme. The bit'repetition unit 21 applies repetition processing to the bits so that diversity transmission can be realized, and the SZP conversion unit 22 Perform conversion. The modulation unit 23 modulates the bit sequence after serial Z-parallel conversion, the M point FFT unit 24 performs Fourier transform on the modulated signal, and the mapping unit 25 continues the signal on each frequency point. Place on the carrier frequency point. Figure 4 shows the frequency mapping.

[0008] N-point IFFT unit 26 performs an inverse Fourier transform process on the modulated signal after mapping, and CP adding unit 27 adds a cyclic 'prefix (CP) to the data block after the inverse Fourier transform, The P / S converter 28 performs normal / serial conversion on the data after CP addition, and then transmits the data via an antenna (not shown).

[0009] The DFDMA method and the LFDMA method described above have different characteristics and different suitable environments (see Non-Patent Document 2). [0010] For example, when channel information can be accurately estimated, the DFD MA method can obtain a higher frequency diversity gain than the LFDMA method. On the other hand, if there is an error in channel estimation, the gain of the DFDMA method is not significant. In addition, users who move at high speed can obtain higher time diversity by adopting the LFDMA method.

[0011] When viewed from the angle of channel estimation, in the LFDMA system, the frequency of each channel that needs to be estimated is continuous in a certain frequency band, and each channel has a relatively high correlation. . When using the same number of pilot signals with relatively few parameters to be estimated, the channel estimation accuracy of the LFDMA scheme is high.

[0012] In an actual system, not all channels on all frequency points are estimated using direct pilot signals, but only signals on some frequency points are used in the pilot signal. Channel estimates that are directly estimated and other frequency points are obtained by interpolation of the already estimated channel estimation results. When the DFDMA method is adopted, the frequency interval between the already estimated channel and the channel that needs to be obtained by interpolation is relatively long. Channel independence is high between different frequency points. Therefore, in the case of the DFDMA system, the channel estimation accuracy obtained by interpolation is low.

[0013] Thus, the DFDMA system and the LFDMA system have different characteristics and are used in different situations. In an actual system, the channel characteristics change as the scatterer in the outside world changes and the user's moving speed changes. However, all existing brands currently use only one type of DFDMA or LFDMA in a single system.

FIG. 5 is a block diagram showing a main configuration of a transmission apparatus that realizes hybrid FDMA (HFDMA: Hybrid Frequency Division Multiple Access) in which frequencies are mixedly (Hybrid). Bit'repetition unit 31 applies repetition processing to the bits to enable diversity transmission.S / P conversion unit 32 performs serial Z parallel processing on the bit sequence output from bit'repetition unit 31. Perform conversion. The modulation unit 33 modulates the bit sequence after serial Z-parallel conversion, and the M point FFT unit 34 applies to the modulated signal. The Fourier transform is performed, and the mapping unit 35 maps the signal on each frequency point onto the carrier frequency point.

FIG. 6 shows the frequency mapping. As shown in Fig. 6, in the HFDMA method, the carriers after mapping are arranged in a bundle, and one bundle is formed by a small number of adjacent carriers at a narrow frequency interval, and the frequency between the bundles is determined. The interval is far away. In this way, the carriers mapped by the HFDMA method are not arranged continuously like the LFDMA method, and even if they are arranged at regular intervals like the DFDMA method! /! /.

[0016] The N-point IFFT unit 36 performs inverse Fourier transform processing on the mapped carrier, and the CP adding unit 37 adds a cyclic prefix (CP) to the data block after the inverse Fourier transform, and P The / S conversion unit 38 performs normal / serial conversion on the data after CP addition, and then transmits the data via an antenna (not shown).

By the way, in recent years, in a multi-antenna communication system represented by a MIMO (Multiple Input Multiple Output) communication system, a frequency diversity gain and a time diversity gain are obtained by transmitting modulated signals from a plurality of antennas. Has become possible. Non-Patent Document 1: 3GPP R1-051290, "3GPP TSG WG1 Meeting # 42bis reports" Non-Patent Document 2: 3GPP Rl-050883 Samsung, "Performance comparison between LFDM

A and DFDMA for EUTRA "

Disclosure of the invention

Problems to be solved by the invention

However, when the frequency division multiple access method is adopted in the MIMO system, it is not always possible to obtain the frequency diversity gain and the time diversity gain.

That is, in the conventional MIMO system, as shown in FIGS. 7 and 8, each transmission antenna adopts the same frequency division multiple access scheme. That is, each transmitting antenna is either one that employs the DFDMA scheme as shown in FIG. 7, or all of the LFDMA scheme as shown in FIG. In such a DFDMA-MIMO system and LF DMA-MIMO system, the mapping of the DFDMAZLFDMA scheme to each transmit antenna is the same. Therefore, the same frequency after Fourier transform Region signals are mapped to the same carrier frequency. Therefore, when channel characteristics change, it is difficult for conventional MIMO systems to adapt to both low-time fluctuation systems and high-time fluctuation systems at the same time, and to obtain frequency diversity gain and time diversity gain at the same time. Is difficult.

[0020] An object of the present invention is to provide a frequency allocation method, a detection method, a transmission device, and a reception device capable of simultaneously obtaining a frequency diversity gain and a time diversity gain in a MIMO system! That is.

Means for solving the problem

[0021] One aspect of the frequency allocation method of the present invention includes a spatio-temporal processing step of distributing a signal to a plurality of transmission antennas included in a transmission device, and a signal transmitted from the plurality of transmission antennas. Distributed—FDMA, Localized—FD that allocates a distributed frequency band for each transmit antenna so that most of the transmitted signals for each transmit antenna do not overlap each other in the frequency domain. A frequency allocation step for allocating frequencies using either one of the MA scheme or the Hybrid—FDMA scheme for allocating a mixed frequency band is included.

[0022] According to this method, the frequency band is distributed in a distributed manner using a multi-antenna characteristic, the Distributed—FDMA method, the Localized—FD MA method in which a frequency band is assigned locally, or the frequency band in a mixed manner. Assigned Hybrid—FDMA method can coexist, so that when channel characteristics change, it can be adapted to both low time fluctuation and high time fluctuation at the same time, and frequency diversity gain and time diversity gain can be adjusted. Since it can be obtained at the same time, the adaptability of the system can be enhanced

[0023] One aspect of the detection method of the present invention is a Distributed-FDMA scheme in which a distributed frequency band is allocated to each of a plurality of transmission antennas included in a transmission apparatus, a Localized-FDMA scheme in which a local frequency band is allocated, or Hybrid band for allocating a mixed frequency band—receiving signals transmitted from the plurality of transmitting antennas, each of which is assigned a frequency using one of the FDMA schemes, and the received signal On the other hand, a transform step for transforming the received signal from the frequency domain to the time domain by performing a space-time inverse Fourier transform, and a transmission signal from the plurality of transmit antennas by performing MIMO detection in the time domain. And a detecting step for detecting.

[0024] According to this method, a Distributed—FDMA system that allocates frequency bands in a distributed manner, a Localized—FDMA system that allocates frequency bands locally, or a Hybrid—FDMA system that allocates frequency bands in a mixed manner coexists. Thus, by performing a spatio-temporal inverse Fourier transform on the received signals that overlap in the frequency domain, the received signal is converted from the frequency domain to the time domain, and MIMO detection is performed in the time domain. Since it is possible to detect transmission signals with multiple transmit antenna forces, it is possible to adapt to both low and high time fluctuations when the channel characteristics change, and frequency diversity gain and time diversity gain Can be obtained at the same time, so the adaptability of the system can be enhanced.

The invention's effect

[0025] According to the present invention, it is possible to obtain frequency diversity gain and time diversity gain at the same time in a MIMO system.

Brief Description of Drawings

[0026] [FIG. 1] A block diagram showing a main configuration of a conventional DFDMA transmission device

[Figure 2] Diagram showing frequency characteristics of conventional DFDMA system

[Fig. 3] Block diagram showing the main configuration of a conventional LFDMA transmitter

[Figure 4] Diagram showing frequency characteristics of conventional LFDMA system

FIG. 5 is a block diagram showing the main configuration of a conventional HFDMA transmitter.

[Figure 6] Diagram showing frequency characteristics of conventional HFDMA

[Fig.7] Block diagram showing the main configuration of a conventional DFDMA-MIMO transmitter

[Fig.8] Block diagram showing the main configuration of a conventional LFDMA-MIMO transmitter

FIG. 9 is a block diagram showing the main configuration of the transmitting apparatus according to Embodiment 1 of the present invention.

FIG. 10 is a diagram showing the frequency characteristics of a mixed FDMA scheme with distributed local antennas according to Embodiment 1.

FIG. 11 is a block diagram showing the main configuration of another transmitting apparatus according to Embodiment 1. FIG. 12 is a diagram showing frequency characteristics of the distributed single-mix FDMA scheme according to the first embodiment.

FIG. 13 is a block diagram showing a main configuration of another transmitting apparatus according to Embodiment 1.

FIG. 14 is a diagram showing frequency characteristics of the local single mixed FDMA scheme according to the first embodiment.

FIG. 15 is a block diagram showing a main configuration of another transmitting apparatus according to Embodiment 1.

FIG. 16 is a diagram showing frequency characteristics of the mixed one-mix FDMA system according to the first embodiment.

[Figure 17] Diagram showing the relationship between SINR frequency characteristics and optimum MCS for each SINR

FIG. 18 is a block diagram showing a main configuration of a transmitting apparatus according to Embodiment 2 of the present invention.

FIG. 19 is a block diagram showing a main configuration of a transmitting apparatus according to Embodiment 2.

FIG. 20 is a diagram showing frequency characteristics of the inter-antenna mixed FDMA scheme according to Embodiment 2.

FIG. 21 is a block diagram showing a main configuration of another transmitting apparatus according to Embodiment 2.

FIG. 22 is a diagram showing frequency characteristics and power characteristics of the inter-antenna mixed FDMA scheme according to the second embodiment.

FIG. 23 is a block diagram showing the main configuration of a receiving apparatus according to Embodiment 3 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

[0027] A system according to an embodiment of the present invention includes a transmission device including a plurality of transmission antennas and a reception device including a plurality of reception antennas.

[0028] In the present invention, different frequency division schemes can be used for each transmission antenna. Hereinafter, this is referred to as "inter-antenna mixed frequency division scheme (or inter-antenna confusion FDMA scheme)". For example, the transmission apparatus allocates the DFDMA scheme to some transmission antennas and allocates the LFDMA scheme to other partial antennas. As a result, the characteristics of the distributed FDMA (DFDMA) system that allocates the frequency band in a distributed manner and the localized dFDMA (LFDMA) system that allocates the frequency band locally can coexist in the transmitting apparatus using the multi-antenna characteristics of the transmitting apparatus. Can do. Considering that the channel characteristics change, a transmitter in which the DFDMA and LFDMA systems coexist can be applied simultaneously to a low time fluctuation system and a high time fluctuation system, and frequency diversity gain and time diversity gain Can be provided at the same time, so the adaptability of the system can be enhanced.

In the present invention, an inter-antenna mixed frequency division method is presented. Specific explanation is given below. As described above, the signal sequence is transmitted from each of the plurality of transmission antennas of the transmission apparatus after frequency allocation is performed by the mixed frequency allocation method of the present invention. On the receiving side, a signal including noise transmitted from each transmitting antenna is received. The noise is assumed to be white Gaussian noise. The channel fading on each antenna is independent of the channel fading between the antennas as well as the Rayleigh fading. If the receiving antenna or the transmitting antenna is different, the noise received by each antenna on the receiving antenna is also independent. Distribution. Various modulation schemes may be employed as the signal modulation scheme.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]

(1) DFDMA-LFDM A type mixed type

FIG. 9 is a block diagram showing a main configuration of the transmitting apparatus according to the first embodiment. The transmission apparatus 100 in FIG. 9 includes two transmission antennas, and performs frequency allocation using a distributed one-local frequency division multiple access scheme as an “inter-antenna mixed frequency division scheme”.

In FIG. 9, a transmitter 100 includes a space-time processing unit 110, an SZP conversion / modulation unit 120-1, 120-2, an M point FFT unit 130-1, 130-2, a DFDMA mapping unit 140, an LFDMA matrix. It is configured to include a webbing unit 150, an N-point IFFT unit 160-1, 160-2, a CP-attached calorie PZS conversion unit 170-1, 170-2, and a transmission antenna 180-1, 180-2.

The space-time processing unit 110 distributes the transmission data to the SZP conversion / modulation units 120-1 and 120-2.

[0034] The SZP conversion 'modulation units 120-1 and 120-2 perform serial Z-parallel conversion and modulation on the transmission data distributed by the space-time processing unit 110, and each of the obtained modulated signals is M. Point Output to FFT 咅 130-1 and 130-2.

[0035] The M-point FFT unit 130-1, 130-2 performs fast Fourier transform on the modulated signal to convert it to a frequency domain signal, and the M-point FFT unit 130-1 converts the frequency domain signal after the fast Fourier transform. The M point FFT unit 130-2 outputs the frequency domain signal after the fast Fourier transform to the LFDMA mapping unit 150.

[0036] The DFDMA mapping unit 140 is based on the DistributedFDMA method, and the frequency domain Map the signal onto each carrier frequency point. Specifically, as shown in FIG. 10A, the DFDMA mapping unit 140 arranges frequency domain signals at regular intervals on each frequency point.

[0037] LFDMA mapping section 150 maps a frequency domain signal onto each carrier frequency point based on the Localized FDMA scheme. Specifically, as shown in FIG. 10B, LFDMA mapping section 150 continuously arranges frequency domain signals on continuous frequency points with N-point IFFT section 160-2.

[0038] The N-point IFFT units 160-1 and 160-2 perform inverse fast Fourier transform on the frequency domain signals mapped on the respective carrier frequency points by the DFDMA mapping unit 140 and the LFDMA mapping unit 150, and perform inverse processing. The time domain signal after the fast Fourier transform is output to the CP-added PZS converter 170-1 and 170-2, respectively.

[0039] CP addition 'PZS converter 170—1, 170—2 adds CP to the time domain signal, performs parallel Z-serial conversion on the time domain signal after CP addition, and transmits antenna 180—1, 18 0—Send via 2 respectively.

[0040] Hereinafter, the operation of transmitting apparatus 100 configured as described above will be described.

[0041] The transmitting antenna 180-1 adopts a distributed frequency allocation method, and the signal subjected to serial Z parallel conversion and modulation by the SZP conversion 'modulation unit 120-1 is an M point FFT unit 1 30-1 By the fast Fourier transform. The signals after the fast Fourier transform are arranged at regular intervals on each frequency point as shown in FIG. 10A by the DFDMA mapping unit 140 before the inverse Fourier transform. N-point IFFT section 160-1 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and adds CP. • PZS transform section 170-1 converts the signal to the inverse Fourier transform signal. A CP is added, and the signal after the CP is subjected to normal / serial conversion and then transmitted via the transmitting antenna 180-1.

[0042] Transmitting antenna 180-2 employs a local frequency allocation method, and the frequency domain signal after the fast Fourier transform is a continuous signal having an N-point IFFT section 1602, as shown in FIG. 10B, before the inverse Fourier transform. It is arranged continuously on the frequency point to be.

[0043] In this way, the transmission antenna 180-1 modulates with the DistributedFDMA method. A signal is output, and a modulated signal by the Localized FDMA system is output from the transmitting antenna 180-2. Fig. 10C shows the frequency characteristics of the received signal received at the receiving device of the communication partner.

As described above, the multi-antenna characteristics of the transmission apparatus 100 are used so that the DFDMA scheme and the LFDMA scheme exist at the same time in the transmission apparatus 100. Therefore, by preventing most of the DFDM A mapping unit 140, LFDMA mapping unit 150, and force mapping destination frequency points from overlapping each other, as shown in FIG. It is possible to prevent most of the areas from overlapping each other. As a result, even when the channel characteristics change, the transmitter 100 can simultaneously adapt to both a system with low time fluctuation and a system with high time fluctuation, and simultaneously provides frequency diversity gain and time diversity gain. As a result, the adaptability of the system can be enhanced.

[0045] At the time of detection, a mixed user signal on each frequency point is separated for each frequency point using a MIMO detection method for a portion where the frequency points overlap.

[0046] (2) DFDMA HFDM A type mixed type

FIG. 11 is a block diagram showing another main configuration of the transmitting apparatus according to the present embodiment. In FIG. 11, the same components as those in FIG. Transmitting apparatus 200 in FIG. 11 includes two transmitting antennas, and performs frequency allocation by using a distributed single-mixing frequency division multiple access method as a mixed frequency division method between antennas.

The transmission apparatus 200 in FIG. 11 adopts a configuration in which the LFDMA mapping unit 150 is deleted and the HFDMA mapping unit 210 is added to the transmission apparatus 100 in FIG.

[0048] Based on the DistributedFDMA scheme, the DFDMA mapping unit 140 arranges frequency domain signals at regular intervals on each frequency point, as shown in FIG. 12A, as in FIG. 10A.

[0049] Based on the HybridFDMA scheme, the HFDMA mapping unit 210 converts the frequency domain signal after Fourier transform between a bundle having a narrow interval between bundles, as shown in FIG. 12B. Place the frequency points on the frequency points so that they are separated.

[0050] Hereinafter, the operation of transmitting apparatus 200 configured as described above will be described.

[0051] Transmitting antenna 180-1 employs a distributed frequency allocation method. The signal subjected to serial Z parallel conversion and modulation by the SZP conversion 'modulation unit 120-1 is fast Fourier transformed by the M-point FFT unit 130-1. The signal after the fast Fourier transform is arranged on each frequency point at regular intervals as shown in FIG. 12A by the DFDMA mapping unit 140 before the inverse Fourier transform. N-point IFFT section 160-1 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and adds CP. • PZS transform section 170-1 converts the signal to the inverse Fourier transform signal. A CP is added, and the signal after the CP is subjected to normal / serial conversion and then transmitted via the transmitting antenna 180-1.

[0052] The transmitting antenna 180-2 employs a mixed frequency allocation method. The frequency domain signals after the fast Fourier transform are arranged on the frequency points before the inverse Fourier transform, as shown in Fig. 12B, so that the distance between the bundles that are narrow in the bundle is separated. It is done.

[0053] In this way, a modulated signal based on the DistributedFDMA scheme is output from the transmitting antenna 180-1, and a modulated signal based on the HybridFDMA scheme is output from the transmitting antenna 180-2. Fig. 12C shows the frequency characteristics of the received signal received at the receiving device of the communication partner.

As described above, the multi-antenna characteristics of the transmission apparatus 200 are used so that the DFDMA scheme and the HFDMA scheme exist simultaneously in the transmission apparatus 200. Therefore, by preventing most of the frequency points of the DFDM A mapping unit 140, the HFDMA mapping unit 210, and the force mapping destination from overlapping each other, as shown in FIG. It is possible to prevent most of the areas from overlapping each other. As a result, even when the channel characteristics change, the transmitter 200 can simultaneously adapt to both a system with low time fluctuation and a system with high time fluctuation, and simultaneously provides frequency diversity gain and time diversity gain. As a result, the adaptability of the system can be enhanced.

[0055] (3) LFDMA—HFDMA mixed type FIG. 13 is a block diagram showing another main configuration of the transmitting apparatus according to the present embodiment. In FIG. 13, the same components as in FIG. Transmitting apparatus 300 in FIG. 13 includes two transmitting antennas, and performs frequency allocation using a local mixed frequency division multiple access scheme as a mixed frequency division scheme between antennas.

The transmission apparatus 300 in FIG. 13 adopts a configuration in which the DFDMA mapping unit 140 is deleted and the HFDMA mapping unit 310 is added to the transmission apparatus 100 in FIG.

[0057] Based on the Localized FDMA scheme, the LFDMA mapping unit 150 continues the frequency domain signal on the continuous frequency points with the N-point IFFT unit 160-2 as shown in FIG. 14A, as in FIG. 10B. Arrange.

[0058] Based on the HybridFDMA scheme, the HFDMA mapping unit 310 converts the frequencies of the N outputs of the Fourier transform between the bundles and the bundles that are narrow in the bundle, as shown in FIG. 14B. Place on the frequency point so that

[0059] Hereinafter, the operation of transmitting apparatus 300 configured as described above will be described.

[0060] Transmitting antenna 180-1 employs a mixed frequency allocation method. As shown in Fig. 14A, the frequency domain signal after the fast Fourier transform is placed on the frequency point so that the distance between the bundles that are narrow in the bundle is separated as shown in Fig. 14A. Are lined up.

[0061] The transmitting antenna 180-2 adopts a local frequency allocation method. The signal subjected to serial Z parallel conversion and modulation by the SZP conversion 'modulation unit 120-2 is subjected to fast Fourier transform by the M-point FFT unit 130-2. The signal after the fast Fourier transform is continuously arranged by the LFDMA mapping unit 150 on the continuous frequency points with the N-point IFFT unit 160-2 as shown in FIG. 14B before the inverse Fourier transform. N-point IFFT unit 160-2 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and CP addition 'PZS transform unit 170-2 converts the signal to the signal after inverse Fourier transform. CP is added, and the signal after CP is parallel-Z-serial converted, and then transmitted via transmit antenna 180-2.

[0062] In this manner, a modulated signal based on the HybridFDMA scheme is output from the transmitting antenna 180-1 and a modulated signal based on the Localized FDMA scheme is output from the transmitting antenna 180-2. Is output. Fig. 14C shows the frequency characteristics of the received signal received at the receiving device of the communication partner.

In this way, the multi-antenna characteristics of the transmission apparatus 300 are used so that the LFDMA scheme and the HFDMA mapping scheme exist at the same time in the transmission apparatus 300. Therefore, by preventing most of the frequency points of the HFDMA mapping unit 310, the LFDMA mapping unit 150, and the force mapping destination from overlapping each other, as shown in FIG. Most of the above can be non-overlapping so that the transmitter 300 can adapt simultaneously to both low and high time variation systems, even when channel characteristics change. In addition, since frequency diversity gain and time diversity gain can be provided simultaneously, the adaptability of the system can be enhanced.

[0064] (4) HFDMA HFDMA mixed type

FIG. 15 is a block diagram showing another main configuration of the transmitting apparatus according to the present embodiment. In FIG. 15, the same components as those in FIG. The transmission apparatus 400 in FIG. 15 includes two transmission antennas, and uses a mixed single-mixing mixed frequency multiple access method between antennas as a mixed frequency division method.

The transmitter 400 in FIG. 15 adopts a configuration in which the DFDMA mapping unit 140 and the LFDMA mapping unit 150 are deleted and the HFDMA mapping units 410 and 420 are added to the transmitter 100 in FIG.

[0066] Based on the HybridFDMA scheme, the HFDMA mapping units 410 and 420 convert the subsequent frequency domain signals between the bundles having a narrow interval between the bundles as shown in FIGS. 16A and 16B. Place the frequency points on the frequency points so that they are separated.

Hereinafter, the operation of the transmission apparatus 400 configured as described above will be described.

[0068] Transmitting antenna 180-1 employs a mixed frequency allocation method. The signal subjected to serial Z parallel conversion and modulation by the SZP conversion 'modulation unit 120-1 is fast Fourier transformed by the M-point FFT unit 130-1. As shown in FIG. 16A, the signal after the fast Fourier transform is separated by the HFDMA mapping unit 410 before the inverse Fourier transform so that the interval between the bundles in which the interval is narrow is separated as shown in FIG. 16A. Arranged on the frequency points. N-point IFFT unit 160-1 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and CP addition 'PZS transform unit 170-1 converts the signal to the signal after inverse Fourier transform. CP is added, and the signal after CP is converted to normal Z serial, and then transmitted via transmit antenna 180-1.

[0069] The transmission antenna 180-2 adopts a mixed frequency allocation method in the same manner as the transmission antenna 180-1. As shown in Fig. 16B, the frequency domain signal after the fast Fourier transform is placed on the frequency point so that the distance between the bundles that are narrow in the bundle is separated, as shown in Fig. 16B. Are lined up.

[0070] In this way, modulation signals by the HybridFDMA method are output from the transmitting antennas 180-1, 180-2, and the like. Fig. 16C shows the frequency characteristics of the received signal received at the receiving device of the communication partner.

As described above, the multi-antenna characteristics of the transmission apparatus 400 are used, and the transmission apparatus 400 uses the HFDMA scheme to assign frequencies. Therefore, the HFDMA mapping unit 410 and the HFDMA mapping unit 420 prevent most of the mapping destination frequency points from overlapping each other, so that the transmission signal for each transmission antenna is as shown in FIG. In the frequency domain, most of them do not overlap each other, so that even when the channel characteristics change, the transmitter 400 has a low time fluctuation system and a high time fluctuation. The system can be adapted to both the system and the frequency diversity gain and the time diversity gain can be provided at the same time, thereby enhancing the adaptability of the system.

[0072] As described above, according to the present embodiment, the transmission apparatus has a plurality of transmission antennas, and transmission signals for each transmission antenna are transmitted so as not to overlap each other in the frequency domain. Distributed—FDMA method that allocates a distributed frequency band for each antenna, Localized—FDMA method that allocates a local frequency band, or Hybrid—FDMA method that allocates a mixed frequency band. As a result, frequency diversity gain and spatio-temporal diversity gain can be obtained simultaneously.

[0073] Note that the number of transmission antennas adopting the local formula, distributed formula, and mixed formula depends on the mobility of the user. And the antenna correlation. As a result, the frequency band can be selected according to the change in channel characteristics, and the frequency diversity gain and the time diversity gain can be reliably obtained.

[Embodiment 2]

In a wireless environment, signal-to-interference noise ratio (SINR) varies with frequency. Figure 17 shows the relationship between the frequency characteristics of SINR and the optimal modulation scheme and coding rate (MCS: Modulation and Coding Scheme) for each SINR. As shown in the figure, SINR varies greatly depending on the frequency band. Therefore, since the SINR differs depending on the frequency band, the optimal MCS will differ for each frequency band. In MIMO systems, channel fading of each antenna is highly independent, so the transmission rate and MCS power of each antenna may be different for each antenna. Therefore, the transmission apparatus according to the present embodiment selects a different transmission rate or MCS for each frequency based on the difference in SINR for each frequency.

[0075] (1) Transmission rate

In the following, a case will be described in which two transmission antennas 580-1 and 580-2 have the same modulation scheme and transmit bit streams of different transmission rates.

FIG. 18 is a block diagram showing a main configuration of transmitting apparatus 500 according to Embodiment 2. 18 includes a spatio-temporal processing unit 510, SZP conversion / modulation unit 520-1, 520-2, Ml point FFT unit 530-1, M2 point FFT unit 530-2, HFDMAI mapping unit 540, HF DMAII. Mapping unit 550, N1 point IFFT unit 560-1, N2 point IFFT unit 560-2, Cal with CP • PZS conversion unit 570-1, 570-2, and transmission antennas 580-1, 580-2 Is done.

[0077] The spatio-temporal processing unit 510 performs spatio-temporal processing on the signal, and allocates data of a different transmission rate for each transmission antenna based on the fading characteristics of the antenna. In the following description, it is assumed that the transmission rate of transmission antenna 580-1 is higher than the transmission rate of transmission antenna 580-2.

[0078] The SZP conversion / modulation units 520-1 and 520-2 perform serial Z-parallel conversion and modulation on the transmission data distributed by the space-time processing unit 510, and each of the obtained modulated signals. Output Ml point FFT section 530-1, 1 ^ 2 point Pick section 530-2.

[0079] Ml point FFT unit 530-1 and M2 point FFT unit 530-2 perform fast Fourier transform on the modulated signal and convert it to frequency domain signal, and Ml point FFT unit 530-1 performs fast Fourier transform The frequency domain signal is output to the HFDMAI mapping unit 540, and the M2 point FFT unit 530-2 outputs the frequency domain signal after the fast Fourier transform to the HFDMAII mapping unit 550.

[0080] HFDMAI mapping unit 540, HFDMAII mapping unit 550 are Ml point FFT unit 530

1, M2 point FFT section 530-2 assigns each frequency domain signal output to the corresponding carrier by any one of DFDMA, LFDM A, and HFDMA. Since the transmission rate of transmission antenna 580-1 is larger than the transmission rate of transmission antenna 580-2, the number of carriers assigned to transmission antenna 580-1 is larger than the number of carriers assigned to transmission antenna 580-2. .

[0081] N1-point IFFT section 560-1, N2 ^ JFFT¾560-2 «, HFDMAI mapping section 540 and HFDMAII mapping section 550 perform inverse fast Fourier transform on the frequency domain signal mapped on each carrier frequency point The time domain signal after inverse fast Fourier transform is output to the CP-added 'PZS converters 570-1 and 570-2.

[0082] CP addition 'PZS converters 570-1, 1, 570-2 add CP to the time domain signal, perform parallel Z-serial conversion on the time domain signal after CP addition, and transmit antennas 580-1, 58 0—Send via 2 respectively.

Hereinafter, the operation of transmitting apparatus 500 configured as described above will be described.

The space-time processing unit 510 performs space-time processing on the signal, and data having a different transmission rate is assigned to each transmission antenna based on the fading characteristics of the antenna.

[0085] The data allocated by the spatio-temporal processing unit 510 is subjected to serial Z-parallel conversion and modulation by the SZP conversion / modulation unit 520-1, and then the Ml point FFT unit 530-1. Fast Fourier transform. Each frequency domain signal output from the Ml-point FFT unit 530-1 is assigned to the corresponding carrier by one of DFDMA, LFD MA, and HFDMA by the HFDMAI mapping unit 540 before the inverse Fourier transform. In addition, send Since the transmission rate of the transmission antenna 580-1 is larger than that of the transmission antenna 580-2, the carrier allocated to the transmission antenna 580-1 is larger than the carrier allocated to the transmission antenna 580-2.

[0086] The data allocated by the spatio-temporal processing unit 510 is subjected to serial Z-parallel conversion and modulation by the SZP conversion / modulation unit 520-2, and then the M2 point FFT unit 530-2. Fast Fourier transform. Each frequency domain signal output from the M2 point FFT unit 530-2 is assigned to the corresponding carrier by one of DFDMA, LFD MA, and HFDMA by the HFDMAII mapping unit 550 before the inverse Fourier transform.

[0087] Then, the N1-point IFFT section 560-1 and the N2-point IFFT section 560-2 are subjected to inverse fast Fourier transform on the frequency domain signal mapped on each carrier frequency point, and the inverse fast Fourier transform is performed. The converted time domain signal is output to the CP-added 'PZS converter 570-1, 570-2. CP addition 'PZS converter 570—1, 570—2 adds a CP to the time domain signal, and after normalization / serial conversion of the signal after CP addition, the transmission antenna 580—1, 580 — Sent via 2.

[0088] (2) MCS

Next, the case where two transmission antennas 580-1, 580-2 have the same transmission rate and are transmitted with different modulation schemes will be described. For example, if transmit antenna 580-1 power QPSK is selected, and transmit antenna 580-2 is selected 8PSK, and the transmission rate is the same, the occupied frequency band of transmit antenna 580-1 is occupied by transmit antenna 580-2. Double the frequency band. As a result, the reception signal on the receiving side shows a phenomenon of mixing at some frequency points. Such a system is also a kind of mixed frequency division system.

FIG. 19 is a block diagram showing another main configuration of the transmitting apparatus according to the present embodiment.

In FIG. 19, the same components as those in FIG.

The transmitting apparatus 600 in FIG. 19 deletes the spatio-temporal processing unit 510 and the S / P conversion / modulation units 520-1 and 520-2 from the transmitting apparatus 500 in FIG. , SZP converter 62 0-1, 620-2, MCSI 630-1, and MCSII 630-2 are added. The space-time processing unit 610 assigns different encoding and modulation schemes to the MCSI unit 620-1 and the MCSII unit 620-2 based on the fading characteristics of the antenna, and the MCSI unit 620-1 and the MCSII unit 620— Signals are assigned to SZP converters 620-1, 620-2 based on the code and modulation method assigned to 2.

[0092] The SZP conversion units 620-1 and 620-2 perform serial / parallel conversion on the signals assigned by the space-time processing unit 610, and the serial / parallel converted signals are respectively converted to MCSI units 630-1 And output to MCSII section 630-2.

[0093] The MCSI unit 630-1 and the MCSII unit 630-2 perform coding and modulation on the signal after serial Z parallel conversion, and the obtained modulated signals are respectively Ml-point FFT units 530-1 and 530-1, Output to M2 point FFT section 530-2.

Hereinafter, an operation of transmitting apparatus 600 configured as described above will be described.

The space-time processing unit 610 performs space-time processing on the signal and assigns a different code and modulation scheme to each antenna based on the fading characteristics of the antenna. S ZP conversion unit 620-1 converts the signal that has been converted from serial to parallel into the ZSI based on the encoding and modulation method of MCSI unit 6301, and Ml point FFT unit 53 0-1 uses fast Fourier transform. Converted. The signal after the fast Fourier transform is assigned to a corresponding carrier by one of DFDMA, LFDMA, and HFDMA by the HFDMAI mapping unit 540 before the inverse Fourier transform. At this time, since the modulation order of the transmitting antenna 580-1 is smaller than the modulation order of the transmitting antenna 580-2, when transmitting signals of the same rate from the two transmitting antennas 58 0-1 and 580-2, the transmitting antenna The number of carriers occupied by 580-1 is larger than the number of carriers occupied by transmitting antenna 580-2. N1 point I FFT section 560-1 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and CP addition 'PZS transform section 570-1 converts the signal to the inverse Fourier transform. CP is added, and the signal after CP is converted to normal Z serial, and then transmitted via transmit antenna 580-1.

On the other hand, the signal subjected to serial Z parallel conversion by SZP conversion section 620-2 is encoded and modulated based on the encoding and modulation scheme of MC SII section 630-2, and M2 point FFT section 530 — Fast Fourier transform by 2. The signal after the fast Fourier transform is Before conversion, each frequency domain signal output from the 1 ^ 2 point section 530-2 is assigned to the corresponding carrier by one of DFDMA, LFDMA, and HFDMA by the HFDMA II mapping section 550 . N2 point IFFT section 560-2 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, then CP addition 'PZS transform section 570-2 gives the signal after inverse Fourier transform CP is added to the signal, and the signal after the CP addition is subjected to normal Z-serial conversion and then transmitted via the transmitting antenna 580-2.

Note that FIG. 20 shows the usage status of the frequency points corresponding to each transmission antenna. 20A and 20B show the frequency characteristics of the modulated signals transmitted from the transmitting antennas 580-1 and 580-2, respectively. As shown in Fig. 20C, on the receiving side, the reception signal is mixed at some frequency points. Such a system is also a kind of mixed frequency division system. It should be noted that the frequency diversity gain can be improved by selecting the DistributedFDMA scheme in which the transmission antenna having a higher modulation order assigns more frequencies in a distributed manner.

[0098] (3) Antenna selection and power allocation

In a frequency selective channel, antenna selection and power allocation can be performed in the frequency domain. That is, at each frequency point, a certain antenna is selected (antenna selection) based on the SINR characteristic of each frequency point, or transmission power allocated to each antenna is controlled (power allocation). By adopting this method, it is possible to effectively improve the reception SNR (Signal to Noise Ratio). In the following, the case of performing power allocation will be described.

FIG. 21 is a block diagram showing another main configuration of the transmitting apparatus according to the present embodiment.

In FIG. 21, the same components as those in FIG. 18 are denoted by the same reference numerals and description thereof is omitted. The transmitter 700 in FIG. 21 adopts a configuration in which a power allocation unit 710 is added to the transmitter 500 in FIG.

[0100] The power allocation unit 710 allocates the signal power of the signal after the fast Fourier transform output from the Ml point FFT unit 530-1, 1 ^ 2 point capping unit 530-2. For example, the power allocation unit 710 is connected to the HFDMAI mapping unit 540 and the HFDMAII mapping unit 550 in the subsequent stage. Allocation is made such that the SINR characteristic of each frequency point to be applied is worse and the power is assigned larger, and the power is assigned as the SINR characteristic is better and smaller.

[0101] The operation of transmitting apparatus 700 configured as described above will be described below.

[0102] Spatio-temporal processing is performed on the signal by spatio-temporal processing unit 510, and different code symbols and modulation schemes are assigned to the respective antennas based on the fading characteristics of the antennas. The signal subjected to serial Z parallel conversion and modulation by the SZP conversion 'modulation unit 520-1 is fast Fourier transformed by the Ml point FFT unit 530-1. In the power allocation unit 710, for example, the signal power of the signal after the high-speed Fourier transform is allocated based on the SINR characteristic of each frequency point of the mapping destination. In the HFDMAI mapping unit 540, each frequency domain signal to which signal power is allocated is allocated to a corresponding carrier by any one of DFDMA, LFDMA, and HFDM A. N1 point IFFT section 560-1 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and CP addition 'PZS conversion section 570-1 provides the signal after inverse Fourier transform. CP is added to the signal, and the signal after CP is converted to normal Z serial, and then transmitted via the transmitting antenna 580-1.

On the other hand, the signal subjected to serial Z parallel conversion and modulation by the SZP conversion / modulation unit 520-2 is fast Fourier transformed by the M2 point FFT unit 530-2. In the power allocation unit 710, for example, the signal power of the signal after the high-speed Fourier transform is allocated based on the SINR characteristic of each frequency point of the mapping destination. In the HFDMAII mapping unit 550, each of the frequency domain signal powers DFDMA, LFDMA, and HFD MA to which the signal power is allocated is allocated to the corresponding carrier. N2 point IFFT section 560-2 performs inverse Fourier transform on the frequency domain signal mapped on each carrier frequency point, and CP addition 'PZS transform section 570-2 provides the signal after inverse Fourier transform. CP is added to the signal, and the signal after CP is converted to normal Z serial, and then transmitted via the transmitting antenna 580-2.

[0104] Fig. 22 shows the usage of the frequency points corresponding to each antenna and the state of the power characteristics. 22A and 22B show the frequency characteristics and power characteristics of the modulated signals transmitted from the transmitting antennas 580-1 and 580-2, respectively. As shown in Figure 22C, the receiving side In the received signal, there is a phenomenon that the received signal is mixed at some frequency points. Such a system is also a kind of mixed frequency division system. Frequency diversity gain can be improved by assigning higher power to frequency points with poor frequency characteristics.

[Embodiment 3]

FIG. 23 is a block diagram showing a main configuration of the receiving apparatus according to the present embodiment. 23 receives MIMO signals transmitted from transmitting apparatuses 100, 200, 300, 400, 500, 600, and 700 according to the above-described embodiments, and performs MIMO detection. In the following, a description will be given of the case where the transmission apparatus 100, 200, 300, 400, 500, 600, and 700 transmission antennas are provided, and the reception apparatus 800 is provided with R reception antennas.

In FIG. 23, receiving apparatus 800 includes receiving antennas 810-1 and 810-2, CP elimination 'SZ P conversion unit 820, N1 point FFT unit 830, space-time Fourier transform matrix generation unit 840, space-time IFF T 850, a maximum likelihood detection unit 860, and a demodulation unit 870.

[0107] CP removal 'The SZP converter 820 removes the CP added to the received signal received via the receiving antennas 810-1 and 810-2, and serial-parallel converts the received signal after CP removal. , The received signal of serial to parallel conversion is output to N1 point FFT unit 830.

N1 point FFT section 830 performs fast Fourier transform on the received signal of the serial “parallel conversion” output from CP removal “SZP conversion section 820”. As a result, the frequency domain signal of the mixed signal assigned to the same frequency is obtained on the transmission side.

[0109] The space-time Fourier transform matrix generation unit 840 generates a space-time Fourier transform matrix V, and the space-time IFFT unit 850 performs space-time inverse Fourier transform. The space-time inverse Fourier transform will be described later.

[0110] Maximum likelihood detector 860 estimates a signal using a maximum likelihood estimation algorithm, and demodulator 870

Then, a demodulation process is performed on the estimated signal.

[0111] Hereinafter, the operation of transmitting apparatus 600 configured as described above will be described using mathematical expressions.

[0112] In the receiving device 800, CP removal ′ The CP is removed by the SZP converter 820, and the serial Z parallel The Nl-point FFT unit 830 performs Fourier transform on the input signal, and then obtains the frequency domain signal of the mixed signal. In this frequency domain signal, the transmission antenna signal R _; is expressed as shown in Equation (1).

[Number 1]

H is the i-th column of the channel matrix H, and the j-th element corresponds to channel fading between the transmitting antenna i and the receiving antenna j. s is a sequence of M symbols transmitted from the i-th transmitting antenna, and is mapped to the d + 1st to (d + M) -th inverse Fourier transform input frequency points after Fourier transform. F is a Fourier transform matrix.

A space-time Fourier transform matrix V is constructed by the space-time Fourier transform matrix generation unit 840. The space-time Fourier transform matrix V is expressed by equation (2).

[Equation 2]

Considering the signals transmitted by all transmitting antennas, the signal R after the signal is Fourier transformed on the receiving side is expressed as shown in Equation (3) using the space-time Fourier transform matrix V.

[Equation 3]

In general, for arbitrarily mapped FDMA schemes, V is M blocks The matrix is arranged in a line. Note that the q-th non-zero column vector of the p-th blocked matrix exists at the position of the p-th blocked vector, and the frequency after the LD FMAZDFDMA scheme of the transmit antenna p is performed. Corresponds to the position of the inverse Fourier transform input frequency point on the transmitting side of the qth frequency point. The qth non-zero vector is a Vandermonde Vector that increases linearly based on the phase 2 π ZMq &) o.

Then, the spatiotemporal IFFT unit 850 performs a spatiotemporal inverse Fourier transform. In other words, the received signal after Fourier transform is multiplied from the right by the false inverse of V. Thereby, a time domain signal is obtained as shown in Equation (4).

[Equation 4]

If a signal sequence is multiplied by the inverse matrix of the right force F, it is equivalent to performing an inverse Fourier transform. The calculation that multiplies the false inverse of V by the right force includes the inverse Fourier transform process. V includes the Fourier correspondence of each antenna, and V is the Fourier transform that combines the space domain and the time domain. By multiplying the false inverse of V by the right force, the space-time domain inverse Fourier transform can be realized. For this reason, V is called a space-time Fourier transform matrix.

[0117] Thereafter, the maximum likelihood detection unit 860 uses the maximum likelihood estimation algorithm for the signal r to perform high-performance detection. Finally, the demodulation unit 870 demodulates the maximum likelihood estimation result, and then performs detection. Output power is obtained.

[0118] When detecting such a partially mixed situation using the conventional method, it is necessary to first perform fast Fourier transform on the received signal and then perform MIMO detection at the mixed frequency point was there. Since the signals on the mixed frequency points are frequency domain signals, they do not have the finite sample set characteristics of time domain signals, and therefore, a high-performance maximum likelihood detection algorithm can be applied for detection. It was difficult. [0119] In contrast, in the present invention, the time-domain inverse Fourier transform is performed on the frequency domain signals on all the frequency points to convert the signals from the frequency domain to the time domain, and then MIMO detection is performed in the time domain. Do. At this time, since the mixed signal of MIMO is a time-domain signal, high-performance detection can be realized by applying the maximum likelihood algorithm.

[0120] As described above, according to the present embodiment, the transmission apparatus has a plurality of transmission antennas, and the transmission signal for each transmission antenna is mostly in the frequency domain with respect to the plurality of transmission antennas. Allocate distributed frequency bands for each transmit antenna so that they do not overlap with each other. Distributed—FDMA method, Localized frequency band allocation—Localized—FDM A method, or Hybrid—FDMA method. Each one of them is used to assign a frequency, and the receiving apparatus receives signals transmitted from a plurality of transmitting antennas of the transmitting apparatus, and performs a space-time inverse Fourier transform on the received signals, thereby receiving the received signals. Is converted from the frequency domain to the time domain, and MIMO detection is performed on the time domain to detect transmission signals with multiple transmitting antenna powers.

[0121] With this, MIMO detection can be performed after the mixed signal transmitted from the multiple transmission antennas of the transmission device is converted to a time domain signal, so that a maximum likelihood algorithm with excellent performance can be used. As a result, demodulation accuracy can be improved.

[0122] It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with modifications without departing from the gist thereof.

[0123] The disclosure of the specification, drawings and abstract contained in the Chinese patent application No. 200610071412. filed on Mar. 20, 2006 is hereby incorporated by reference.

Industrial applicability

[0124] The frequency allocation method, detection method, transmission apparatus, and reception apparatus of the present invention can simultaneously obtain frequency diversity gain and time diversity gain in a MIMO system. For example, various cellular systems In the high-speed wireless communication system and the high-throughput wireless local area network system according to the above, it is useful for a frequency allocation method, a detection method, a transmitting apparatus, a receiving apparatus, etc. applied to the uplink wireless communication system.

Claims

The scope of the claims

[1] A spatio-temporal processing step for distributing a signal to a plurality of transmission antennas included in a transmission apparatus and a signal transmitted from each of the plurality of transmission antennas, In order to avoid overlapping each other, a distributed frequency band is allocated for each transmit antenna, a Distributed—FDMA scheme that allocates a local frequency band, a Localized—FDMA scheme that allocates a local frequency band, or a Hybrid—FDMA scheme that allocates a mixed frequency band! Assigning the frequency using one of the shifts, and assigning the frequency,

Frequency allocation method including:

[2] The frequency allocation step includes:

The frequency allocation method according to claim 1, wherein a frequency is allocated based on rate matching or MCS (modulation coding selection).

[3] The frequency allocation step includes:

Assign frequencies based on antenna selection in the frequency domain

The frequency allocation method according to claim 1.

[4] The frequency allocation step includes:

Assign frequencies based on power in the frequency domain

The frequency allocation method according to claim 1.

[5] The frequency allocation step includes:

A step of determining the number of transmitting antennas to which a distributed frequency band or a local frequency band is allocated based on user mobility or antenna correlation;

The frequency allocation method according to claim 1.

[6] The frequency allocation step includes:

The transmission antenna having a higher modulation order further includes a step of allocating frequency bands in a distributed manner

The frequency allocation method according to claim 1.

[7] Distributed—FDMA scheme that allocates distributed frequency bands for each of multiple transmit antennas in a transmitter—Localized—FDMA scheme that allocates local frequency bands, or Hybrid—FDMA scheme that allocates mixed frequency bands Receiving signals transmitted from the plurality of transmitting antennas, each of which is assigned a frequency using one of them,

A transforming step for transforming the received signal from the frequency domain to the time domain by performing a space-time inverse Fourier transform on the received signal;

A detection step of detecting transmission signals of the plurality of transmit antenna forces by performing MIMO detection in the time domain;

A detection method comprising:

[8] The detection step includes

Detect with maximum likelihood algorithm

The detection method according to claim 7.

[9] The conversion step includes

The received signal is converted to serial Z parallel,

Performs Fourier transform on the received signal after serial Z parallel conversion,

Obtaining a mixed domain representation signal of the transmit signal corresponding to the transmit antenna; obtaining a space-time Fourier transform matrix V;

Performing a spatio-temporal inverse Fourier transform on the mixed domain display signal using an inverse matrix of the spatio-temporal inverse Fourier transform matrix V;

including

The detection method according to claim 7.

[10] The space-time Fourier transform matrix V is configured by arranging M blocking matrices in a line,

Among the M blocking matrices, the q-th non-zero column vector of the p-th blocking matrix exists at the position of the p-th blocking matrix, and the frequency of the transmitting antenna p by LDFMA ZDFDMA Of the qth frequency point after mapping, Corresponding to the position of the inverse FFT input frequency point on the transmitting side, the q-th non-zero column vector is a van dermonde vector that increases linearly based on the phase 2 π ZMq.

The detection method according to claim 7.

[11] Multiple transmit antennas,

Spatio-temporal processing means for distributing a signal to the plurality of transmitting antennas;

Distributed-FDMA that allocates a distributed frequency band for each transmission antenna so that most of the transmission signals for each transmission antenna do not overlap each other in the frequency domain with respect to signals transmitted from the plurality of transmission antennas Assign a frequency using the Localized—FDMA method, or a Hybrid—FDMA method that allocates a mixed frequency band.

A transmission apparatus comprising:

[12] Distributed—FDMA system that allocates distributed frequency bands for each of multiple transmit antennas in the transmitter, Localized—FDMA system that allocates local frequency bands, or Hybrid—FDMA system that allocates mixed frequency bands Receiving means for receiving signals transmitted from the plurality of transmitting antennas, each of which is assigned a frequency,

A spatio-temporal inverse Fourier transform means for transforming the received signal into a frequency domain force time domain by performing a spatio-temporal inverse Fourier transform on the received signal;

Detecting means for detecting transmission signals of the plurality of transmitting antenna forces by performing MIMO detection in the time domain;

A receiving apparatus comprising: