JP2002111537A - Demodulation method and communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demodulation method, in which processing delays can be reduced, when a control signal is demodulated in a communication apparatus which performs a demodulation by using a matrix computing operation, and to demodulate a received signal by the demodulation method. SOLUTION: Data 401 and control information 403 are separated from the received signal, and the separated data 401 is demodulated by joint detection in a JD demodulator 104. The control information 403 is subjected to RAKE composition and demodulated by a RAKE demodulator 105.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code D)
ivision Multiple Access) communication device,
The present invention relates to a demodulation method using a matrix operation.

[0002]

2. Description of the Related Art Conventionally, as a method of extracting a demodulated signal by removing various interferences such as interference due to multipath fading, inter-symbol interference, and multiple access interference, a joint signal is used.
There is a method using detection (Joint Detection; hereinafter, referred to as “JD”). For this JD, see "Int
erference Cancellation vs. Channel Equalization an
dJoint Detection for the Downlink of C / TDMA Mobile
Radio Concepts '' (BerndSteiner, Proceedings of EPMC
C Conference Germany 1997, No.145, pp.253-260) or `` EFFICIENT MULTI-RATE MULTI-USER DETECTION FOR
THE ASYNCHRONOUS WCDMA UPLINK '' (HRKarimi, VTC'9
9, pp. 593-597).

[0003] JD is an example of a demodulation method using a matrix operation. That is, the JD performs a predetermined matrix operation using a system matrix in which the convolution operation results of the channel estimation value for each communication terminal (user) and the spreading code assigned to each communication terminal (user) are arranged in a matrix. Then, by multiplying the matrix operation result by the data portion of the received signal, interference is removed and a demodulated signal is extracted. JD above
Thus, demodulated data from which interference has been removed can be obtained without performing despreading and RAKE combining. JD is RAKE
The feature is that the interference removal ability is higher and the reliability of demodulated data is higher than that of combining.

[0004] A conventional communication device that performs demodulation by JD will be described below with reference to FIGS. 4 and 7. FIG.
FIG. 3 is a diagram illustrating an example of a slot configuration of a signal transmitted and received in a communication device that performs demodulation by JD. As shown in this figure, a slot is configured by allocating pilot data 402 and control information 403 between data 401. The control information 403 is a signal for instructing control contents of various functions provided in the communication device, and includes a TPC (Transmit Power Control) command for instructing to increase or decrease transmission power, a channel modulation method, a transmission rate, and a user assignment. TFCI (Transmit
Format Combination Indicator) and the like.

FIG. 7 is a block diagram showing the configuration of a conventional communication device that performs demodulation by JD. Here, a case where the communication device is mounted on a base station will be described as an example. In addition, JD
The demodulator 104 is a demodulator that performs demodulation by JD.
The JD demodulator 104 will be described later in detail with reference to FIG. The base station 10 includes communication terminals 20-1 to 20-1.
The wireless communication is performed with the communication terminal 20-n. Base station 10
Receives a signal transmitted from the communication terminal 20-1 to the communication terminal 20-n from the antenna 11, and the radio receiver 12
The received signal is subjected to radio reception processing such as down-conversion, and the JD demodulator 104 removes interference to perform demodulation, thereby obtaining demodulated data # 1 to demodulated data #n.

[0006]

However, in the above-mentioned demodulation by JD, since a matrix operation is performed, RAKE
There is a problem that a processing delay is increased as compared with the demodulation method using synthesis. In particular, if the processing delay of the control information 403 of the signal configured in the frame format shown in FIG. 4 increases, a problem arises in that control processing using the control information 403 cannot be performed at an appropriate timing.

The above problem will be described with a specific example. For example, it is assumed that the base station 10 is performing closed-loop transmission power control on the downlink. In this case, the base station 10 raises or lowers the transmission power of the downlink according to the control content of the TPC command (control signal) included in the received signal. Since the closed-loop transmission power control is normally performed for each slot, if a processing delay exceeding one slot length occurs in the demodulation of the control signal, the transmission power control timing is delayed and the transmission power control can be appropriately performed. There is a problem that there is no.

[0008] The present invention has been made in view of the above points, and a communication apparatus that performs demodulation using a matrix operation includes:
An object of the present invention is to provide a demodulation method capable of reducing a processing delay when demodulating a control signal, and a communication device for demodulating a received signal by the demodulation method.

[0009]

According to the present invention, there is provided a communication apparatus comprising: a separating unit for separating a data part and a control information part from a received signal; and a first means for demodulating the data part by a demodulation method using a matrix operation. A configuration including demodulation means and second demodulation means for demodulating the control information portion using an operation having a smaller operation amount than the matrix operation is employed.

According to this configuration, the control information included in the received signal is demodulated using an operation having a smaller operation amount than the matrix operation, so that a processing delay in demodulating the control information can be reduced. This makes it possible to appropriately perform control processing such as transmission power control and modulation scheme switching.

The communication device according to the present invention, in the above communication device, employs a configuration in which the first demodulation means demodulates a data portion by joint detection.

According to this configuration, it is possible to reduce the processing delay when demodulating the control information and demodulate the data portion included in the received signal by joint detection, thereby eliminating interference and accurately demodulating. You can do it.

[0013] The communication device of the present invention, in the above communication device, employs a configuration in which the second demodulation means demodulates the control information portion using RAKE combining.

According to this configuration, since the control information included in the received signal is demodulated using RAKE combining, a processing delay in demodulating the control information can be reduced.

The base station apparatus according to the present invention comprises: a receiving means for allocating only a data portion to a first channel and allocating at least a control information portion to a second channel; Separation means for separating the control information portion from the control information portion; first demodulation means for demodulating the data portion by a demodulation method using a matrix operation; and using an operation having a smaller operation amount than the matrix operation for the control information portion. And a second demodulating means for demodulating the data.

According to this configuration, when communication is performed using an I / Q-multiplexed signal on the uplink, it is possible to reduce a processing delay when demodulating control information in the base station apparatus. By this means, it is possible to reduce processing delay when demodulating a TPC command included in uplink control information, so that closed-loop transmission power control can be appropriately performed.

The communication terminal device according to the present invention comprises: a receiving means for receiving a signal constituted by allocating only a data portion to a first channel and allocating at least a control information portion to a second channel; Separation means for separating the control information portion from the control information portion; first demodulation means for demodulating the data portion by a demodulation method using a matrix operation; and using an operation having a smaller operation amount than the matrix operation for the control information portion. And a second demodulating means for demodulating the data.

According to this configuration, it is possible to reduce a processing delay when demodulating control information included in a downlink received signal in the communication terminal device. This makes it possible to reduce the processing delay when demodulating the TFCI included in the downlink control information, so that the switching of the modulation scheme and the transmission rate can be appropriately performed.

According to the demodulation method of the present invention, a data portion and a control information portion are separated from a received signal, and the data portion is demodulated using a matrix operation. And demodulated using.

According to this method, the control information included in the received signal is demodulated using an operation having a smaller operation amount than the matrix operation, so that a processing delay in demodulating the control information can be reduced. This makes it possible to appropriately perform control processing such as transmission power control and modulation scheme switching.

According to the demodulation method of the present invention, a data part and a control information part are separated from a received signal, the data part is demodulated by joint detection, and the control information part is calculated more than a matrix operation used for the joint detection. Demodulation is performed using a small amount of calculation.

According to this method, the control information included in the received signal is demodulated using an operation having a smaller operation amount than the matrix operation used for joint detection, so that a processing delay in demodulating the control information is reduced. be able to. This makes it possible to appropriately perform control processing such as transmission power control and modulation scheme switching.

In the demodulation method of the present invention, a data part and a control information part are separated from a received signal, the data part is demodulated by joint detection, and the control information part is demodulated by R.
Demodulation was performed by AKE synthesis.

According to this method, since the control information portion included in the received signal is demodulated by RAKE combining, the processing delay in demodulating the control information can be reduced.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The gist of the present invention is that a control information portion included in a received signal is demodulated by joint detection, and a data portion included in the received signal is compared with joint detection to reduce the amount of operation. That is, demodulation is performed by a demodulation method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. (Embodiment 1) FIG. 1 is a block diagram showing a configuration of a communication apparatus for performing demodulation by JD according to the present embodiment.
Here, as in the case shown in FIG. 7, a case will be described as an example where the communication apparatus is mounted on a base station and performs wireless communication with communication terminals 20-1 to 20-n. Communication terminal 20-1
The signal transmitted from the communication terminal 20-n has a frame configuration as shown in FIG.

FIG. 4 is a diagram showing an example of a slot configuration of a signal transmitted / received in the communication apparatus according to Embodiment 1 of the present invention. As shown in FIG.
A configuration is adopted in which pilot data 402 (pilot data portion) and control information 403 (control information portion) are inserted between 1 (data portion). This pilot data 4
As 02, it is preferable to adopt a midamble. The midamble is pilot data generated by shifting a known basic code circulating at a predetermined chip cycle by a predetermined chip unit,
Used for channel estimation and the like. The control information 403 is a signal indicating the content of control of various functions provided in the communication device, and includes a TPC command for instructing an increase or decrease in transmission power,
A TFCI that controls a transmission format such as a channel modulation method, a transmission rate, and a user assignment can be given as an example.

In FIG. 1, a radio receiver 102 performs radio reception processing such as amplification and down-conversion on a signal received from an antenna 101. The received signal is configured as shown in FIG. Separator 103 converts the received signal into data 4
01, pilot data 402, and control information 403, the data 401 is transmitted to the JD demodulator 104, the pilot data 402 is transmitted to the channel estimator 106, and the control information 40 is transmitted.
3 is output to the RAKE demodulator 105.

Channel estimator 106 performs channel estimation for each user using inputted pilot data 402. That is, the channel estimator 106 determines the correlation between the known pilot data assigned to each of the communication terminals 20-1 to 20-n and the pilot data 402 separated from the received signal, by an assumed maximum delay. In the range of the width, channel estimation values # 1 to #n for each user are obtained. The obtained channel estimation values are sent to the matrix operation circuit 202 (see FIG. 2) and the corresponding RAKE combining circuits 302-1 to 302-n (see FIG. 3).

The JD demodulator 104 uses a system matrix in which the convolution operation results of the channel estimation value for each communication terminal (user) and the spreading code assigned to each communication terminal (user) are arranged in a matrix. And the result of the matrix operation is multiplied by the output signal (data 401) of the separator 103. By this multiplication processing, various interferences such as interference due to multipath fading, intersymbol interference, and multiple access interference are removed, and demodulated data # 1 to #n for each user are obtained. RAKE
The demodulator 105 outputs the output signal of the separator 103 (control information 4
03) is demodulated by RAKE combining to obtain control information # 1 to control information #n. These control information # 1 to control information #
n is used for subsequent processing such as transmission power control and switching of modulation scheme.

FIG. 2 is a functional block diagram showing the configuration of the JD demodulator 104. Data 401 output from the separator 103 is input to the delay circuit 201. Delay circuit 2
01 delays the input data 401 until the processing timing of the multiplication circuit 203 described later.

The matrix operation circuit 202 includes a channel estimator 1
Channel estimation values # 1 to # 1 for each user outputted from
The following matrix operation is performed using the channel estimation value #n. First, a convolution operation of a channel estimation value for each user and a spreading code assigned to each user is performed to obtain a convolution operation result represented by a matrix. Hereinafter, a matrix in which the convolution operation results for each user are regularly arranged is referred to as a system matrix. Here, for simplicity of description, the system matrix is represented as [A]. The matrix operation circuit 202 further performs a matrix multiplication represented by the following equation using the system matrix [A], and
Obtain [B].

[B] = ([A]^H・ [A])^-1・ [A]^H -However, [A]^HIs the conjugate transpose of the system matrix
And ([A]^H・ [A]) ^-1Is [A]^H・ In the inverse matrix of [A]
is there.

The matrix obtained by the above matrix operation
[B] is sent to the multiplication circuit 203. Multiplication circuit 203
Is a multiplication process between the data 401 of the received signal transmitted from the delay circuit 201 at the same timing and the matrix [B] transmitted from the matrix operation circuit 202 to remove interference for each user. Obtain soft decision data. Note that data 4
01 is treated as a vector amount in the multiplication circuit 203.

The soft decision data for each user obtained at this time is sent to the identification circuit 204. The identification circuit 204
The data for each user sent from the multiplication circuit 203 is hard-decided and demodulated data # 1 to demodulated data #n for each user.
Get.

FIG. 3 is a functional block diagram showing the configuration of the RAKE demodulator 105. In the RAKE demodulator 105, the despreading circuits 301-1 to 301-n
The control information 403 output from the demultiplexer 103 is multiplied by a spreading code unique to each user to perform a despreading process, and the processing result is associated with a corresponding RAKE combining circuit 302-1 to 302-1.
Output to the RAKE combining circuit 302-n. RAKE combining circuits 302-1 to 302-n RAKE combine the result of the despread processing with reference to the corresponding channel estimation value obtained in channel estimator 106, and
The AKE combining result is output to the corresponding identification circuits 303-1 to 303-n. The identification circuits 303-1 to 303-n make a hard decision on the RAKE combining result and obtain digital control information # 1 to control information #n. The control information # 1 to control information #n are demodulation results for each user of the control information 403 shown in FIG. The despreading circuit 301
-1 to despreading circuit 301-n, RAKE combining circuit 302
-1 to RAKE combining circuit 302-n, and identification circuit 30
3-1 to identification circuits 303-n are provided by the same number (= n) as the number of users in order to demodulate signals transmitted from the communication terminals 20-1 to 20-n.

Next, the operation of the communication device having the above configuration will be described. The signal received from the antenna 101 is subjected to predetermined radio reception processing by a radio receiver 102, and is separated into data 401, pilot data 402, and control information 403 by a separator 103. Among the separated received signals, data 401 is transmitted to JD demodulator 104, pilot data 402 is transmitted to channel estimator 106, and control information 403 is transmitted.
Is output to the RAKE demodulator 105.

The pilot data 402 output from the separator 103 is input to the channel estimator 106, where it is correlated with a known midamble, and channel estimation values # 1 to #n for each user are calculated. can get. The obtained channel estimation value # 1 to channel estimation value #n
The signal is sent to the matrix operation circuit 202 provided in the demodulator 104 and the corresponding RAKE combining circuits 302-1 to 302-n.

The control information 403 is transmitted to the RAKE demodulator 105
, Demodulated using RAKE combining to obtain hard-decided control information # 1 to control information #n. On the other hand, data 401 is demodulated using JD. That is, data 4
01 is multiplied in the JD demodulator 104 by the system matrix [A] multiplied by the matrix [B] subjected to the processing shown in the equation,
Demodulated data # 1 to demodulated data #n are obtained.

As described above, since the control information 403 is demodulated using RAKE combining, the processing delay can be reduced as compared with the case where demodulation is performed using JD. on the other hand,
Since the demodulated data of the data 401 is demodulated using JD, it is possible to reduce interference and obtain highly accurate demodulated data.

Next, the operation of the JD demodulator 104 will be described. The JD demodulator 104 demodulates the data portion (data 401) of the received signal using JD.

In the JD demodulator 104, the separator 103
The output data 401 is input to the delay circuit 201 and is delayed until the processing timing of the multiplication circuit 203 described later.

The matrix operation circuit 202 first performs a convolution operation on the channel estimation value for each user and the spreading code assigned to each user to obtain a system matrix [A]. Next, the matrix multiplication shown in the equation is performed using the system matrix [A], and the matrix [B]
Is obtained.

The matrix obtained by the above matrix operation
[B] is sent to the multiplication circuit 203. Multiplication circuit 203
Is the data 40 of the received signal sent from the delay circuit 201.
1 is multiplied by the matrix [B] sent from the matrix operation circuit 202 to obtain soft decision data for each user from which interference has been removed. The data for each user obtained at this time is hard-decided by the identification circuit 204, and the demodulated data # 1 to the demodulated data #n
Is obtained.

Next, the operation of the RAKE demodulator 105 will be described. In the RAKE demodulator 105, the demultiplexer 10
3 is output from the despreading circuit 301-
1 to the despreading circuit 301-n.
AKE combining circuit 302-1 to RAKE combining circuit 302-
n, and the hard decision is made by the discriminating circuits 303-1 to 303-n.
Control information #n is obtained. These pieces of control information # 1 to control information #n are used for processing at a later stage such as transmission power control and switching of modulation scheme.

Next, the calculation amount of the JD demodulator 104 and the RAK
The calculation amount of the E demodulator 105 is compared. In this case, RA
Despreading circuits 106-1 to 106-1 provided in KE demodulator 105
Since 106-n performs the same correlation processing as that of the channel estimator 106, the processing of the despreading circuits 106-1 to 106-n does not affect the processing delay. Therefore, the comparison between the calculation amount of the JD demodulator 104 and the calculation amount of the RAKE demodulator 105 is based on the calculation amounts of the matrix operation circuit 202 and the multiplication circuit 203 in the JD demodulator 104 and the RAKE combining circuit 302 in the RAKE demodulator 105. 1 to RAKE combining circuit 302-n.

First, the calculation amounts of the matrix operation circuit 202 and the multiplication circuit 203 in the JD demodulator 104 will be described. The operation in the matrix operation circuit 202 is as follows: (Step A1) Convolution operation of the channel estimation value for each user and the spreading code assigned to each user (Step A2) Operation shown in the equation using the system matrix [A] These are two steps. Further, the multiplication circuit 203
Is a multiplication of (step A3) matrix [B] and data 401. These (Step A1) to (Step A)
The calculation amount of each calculation in 3) will be described in order. However, here, the number of users is n, and the received signal data 40
The number of symbols of 1 is N, the spreading factor of the received signal is Q, and the maximum delay width (number of chips) is W. Also, the K-th user W
The channel estimation values for the chips are represented by H = (H ₁ ^(K) , H ₂ ^(K) ,.
, H _w ^(K) ) and the spreading code is C = (C ₁ ^(K) , C ₂ ^(K) ,
……, C _Q ^(K) ).

The amount of operation of (Step A1) The amount of operation of the convolution operation of the channel estimation value for each user and the spreading code assigned to each user is as follows:
The above H = (H ₁ ^(K) , H ₂ ^(K) ,..., H _w ^(K) ) and C = (C ₁
^(K) , C ₂ ^(K) ,..., C _Q ^(K) ).

(Step A2) Calculation Amount The calculation amount of the calculation shown in the equation using the system matrix [A] will be described. The size of the system matrix [A] under the above conditions is as described in the above “EFFICIENT MULTI-RATE MULTI”.
I-USER DETECTION FOR THE ASYNCHRONOUS WCDMA UPLIN
K ”(HRKarimi, VTC'99, pp. 593-597) and the like, the size is (N × Q + W−1) rows × (n × N) columns. Therefore, the number of multiplications in the [A] ^H. [A] part of the equation is (N ×
(Q + W-1) * (N * Q + W-1) * (n * N) times. Further, since the size of ([A] ^H · [A]) ⁻¹ is (n × N) rows × (n × N) columns, ([A] ^H · [A]) ⁻¹ · [A] ^H
The operation of the part (the operation of multiplying ([A] ^H · [A]) ^-1 by [A] ^H from the right) is (n × N) × (n × N) × (N × Q + W−
1) times. The multiplication in step A2 is a complex multiplication process.

Calculation Amount of (Step A3) The calculation amount of the multiplication of the matrix [B] and the data 401 will be described. Matrix [B] = ([A] ^H · [A]) ^-1 ·
[A] The size of ^H is (n × N) rows × (N × Q + W−1)
In a column, the matrix [B] is multiplied by the data 401 represented by the vector amount. Therefore, the number of multiplications in this case is (n × N) × (N × Q + W−1).

Next, the RAKE combining circuits 302-1 to 302-1R
The calculation amount of the AKE combining circuit 302-n will be described.
RAKE combining circuit 302-1 to RAKE combining circuit 302
In −n, the despread result is complex-multiplied with the channel estimation value of each path and added together with reference to the delay profile created by the corresponding channel estimator 106. Therefore, the processing amount in this case is a complex multiplication process for the number of delayed waves for each user.

As described above, since the processing in the JD demodulator 104 is a matrix operation, many multiplications are repeated.
On the other hand, the process in RAKE demodulator 105 is a complex multiplication process for the number of delayed waves for each user. In this case, RA
The number of multiplications in the KE demodulator 105 is determined by the JD demodulator 10
4 is significantly less than the number of multiplications. Therefore,
The demodulation processing by the RAKE demodulator 105 is performed by the JD demodulator 1
The amount of processing is significantly smaller than the demodulation processing performed by the D.04. As a result, the data 401 is stored in the RAKE demodulator 10.
5, demodulation can greatly reduce the amount of processing and the effect of processing delay.

As described above, according to the present embodiment, control information 403 included in a received signal is demodulated using RAKE demodulator 105, so that processing delay when demodulating control information 403 is reduced. be able to. This makes it possible to appropriately perform control processing such as transmission power control and modulation scheme switching.

Note that the above communication device uses J as a demodulator.
A JD demodulator 104 that performs demodulation by D and a RAKE demodulator 105 that performs RAKE combining are provided. However, the present invention is not limited to this, and the RAKE demodulator 105 demodulates with a smaller amount of computation than the JD demodulator 104. It can be replaced by other demodulators that can.

In the present embodiment, a case has been described in which a communication device that performs demodulation by JD is mounted on a base station. However, the present invention is not limited to this, and may be mounted on a communication terminal.

(Embodiment 2) FIG. 5 is a diagram showing an example of a slot configuration of a signal transmitted / received in a communication apparatus according to Embodiment 2 of the present invention. FIG. 5 shows the I
A slot configuration in which data 501 is assigned to a channel and pilot data 502 and control information 503 are assigned to a Qch is shown.

In the present embodiment, the communication device constructed in the first embodiment is
A case will be described as an example where wireless communication is performed with the communication terminal 20-n. The base station having received the I / Q-multiplexed signal shown in FIG.
1, the pilot data 502 and the control information 503, the data 501 to the JD demodulator 104, the pilot data 502 to the channel estimator 106, and the control information 503.
Is output to the RAKE demodulator 105. In this case, Ich
Are output to the JD demodulator 104, so that the Ich need not separate the signals.

As described above, according to the present embodiment, I / O
Even when communication is performed using the Q-multiplexed signal, the control information 503 of the received signal is transmitted to the RAKE demodulator 105.
Therefore, the processing delay when demodulating the control information 503 can be reduced.

The uplink control information 503 includes a TPC command for increasing or decreasing the transmission power of the downlink. According to the present embodiment, it is possible to reduce a processing delay when demodulating a TPC command, so that closed-loop transmission power control can be appropriately performed.

(Embodiment 3) FIG. 6 is a diagram showing an example of a slot configuration of a signal transmitted / received on a downlink in a communication apparatus according to Embodiment 3 of the present invention. Downlink Shared Channel (DSCH)
l) is a channel for transmitting data at high speed.
Dedicated Physical CHa (DPCH)
nnel) is a channel for transmitting and paging data for each communication terminal. For downlink, data, pilot data, and control information (for example, TPC commands and TFCI) are time-multiplexed. Only data 601 is assigned to DSCH, and data 602 is assigned to DPCH.
, Pilot data 603, and control information 604.

In the present embodiment, a case will be described as an example where the communication apparatus described in the first embodiment is mounted on a communication terminal to perform wireless communication with a base station. The communication terminal that has received the signal having the frame configuration shown in FIG. 6 separates the received signal into data 601, data 602, pilot data 603, and control information 604 in separator 103, and converts data 601 and data 602 into a JD demodulator. In step 104, pilot data 603 is output to channel estimator 106, and control information 604 is output to RAKE demodulator 105.

As described above, according to the present embodiment, even when communication is performed using a channel (DSCH) for performing high-speed data communication, processing delay when demodulating control information 604 is reduced. be able to.

The TFCI for controlling the transmission format such as the channel modulation method and transmission rate is included in the downlink control information 604. The DSCH and the DPCH are code-multiplexed and transmitted at the same time in the same frequency band. Each communication terminal that has received the code-multiplexed DSCH and DPCH from the base station transmits the TFCI for one frame included in the DPCH.
Is demodulated to know the transmission format of DSCH. According to the present embodiment, processing delay when demodulating TFCI can be reduced, so that the transmission format controlled by TFCI can be appropriately controlled.

[0064]

As described above, according to the present invention,
Since the control information included in the received signal is demodulated using the RAKE demodulator, a processing delay when demodulating the control information can be reduced. This makes it possible to appropriately perform control processing such as transmission power control and modulation scheme switching.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a communication device that performs demodulation using JD according to an embodiment of the present invention.

FIG. 2 is a functional block diagram showing a configuration of a JD demodulator;

FIG. 3 is a functional block diagram showing a configuration of a RAKE demodulator;

FIG. 4 is a diagram illustrating an example of a slot configuration of a signal transmitted and received in a communication device that performs demodulation by JD.

FIG. 5 is a diagram showing an example of a slot configuration of a signal transmitted and received in the communication device according to the second embodiment of the present invention.

FIG. 6 is a diagram showing an example of a slot configuration of a signal transmitted and received in a communication device according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a communication device including a conventional demodulator using JD.

[Explanation of symbols]

 103 Separator 104 JD demodulator 105 RAKE demodulator 202 Matrix operation circuit 203 Multiplication circuit 302-1 to 302-n RAKE synthesis circuit 401, 501, 601, 602 Data 402, 502, 603 Pilot data 403, 604 Control information

Claims (8)

[Claims] 1. A separating means for separating a data part and a control information part from a received signal; a first demodulating means for demodulating the data part by a demodulation method using a matrix operation; A second demodulating means for demodulating using an operation having a smaller amount of operation than the operation. 2. The communication device according to claim 1, wherein the first demodulation unit demodulates a data portion by joint detection. 3. The communication device according to claim 1, wherein the second demodulation unit demodulates the control information portion using RAKE combining. 4. A receiving means for receiving a signal constituted by allocating only a data portion to a first channel and allocating at least a control information portion to a second channel, and allocating a data portion and a control information portion from the received signal. Separating means for separating, first demodulating means for demodulating the data part by a demodulation method using matrix operation, and second demodulating means for demodulating the control information part using an operation having a smaller operation amount than the matrix operation.
And a demodulating means. 5. A receiving means for receiving a signal constituted by allocating only a data portion to a first channel and allocating at least a control information portion to a second channel, and comprising a data portion and a control information portion from the received signal. Separating means for separating, first demodulating means for demodulating the data part by a demodulation method using matrix operation, and second demodulating means for demodulating the control information part using an operation having a smaller operation amount than the matrix operation.
And a demodulating means. 6. Separating a data portion and a control information portion from a received signal, demodulating the data portion using a matrix operation,
A demodulation method, wherein the control information portion is demodulated using an operation having a smaller operation amount than the matrix operation. 7. A data portion and a control information portion are separated from a received signal, the data portion is demodulated by joint detection, and the control information portion is subjected to an operation having a smaller operation amount than a matrix operation used for the joint detection. A demodulation method characterized in that demodulation is performed using the demodulation method. 8. A demodulation method comprising separating a data portion and a control information portion from a received signal, demodulating the data portion by joint detection, and demodulating the control information portion by RAKE combining.