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WO2009125501A1 - Récepteur et procédé de réception - Google Patents

Récepteur et procédé de réception Download PDF

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Publication number
WO2009125501A1
WO2009125501A1 PCT/JP2008/057216 JP2008057216W WO2009125501A1 WO 2009125501 A1 WO2009125501 A1 WO 2009125501A1 JP 2008057216 W JP2008057216 W JP 2008057216W WO 2009125501 A1 WO2009125501 A1 WO 2009125501A1
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WO
WIPO (PCT)
Prior art keywords
transfer characteristic
dimensional
data
carrier
symbol
Prior art date
Application number
PCT/JP2008/057216
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English (en)
Japanese (ja)
Inventor
幸雄 林
義徳 阿部
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP2010507108A priority Critical patent/JP5172951B2/ja
Priority to PCT/JP2008/057216 priority patent/WO2009125501A1/fr
Publication of WO2009125501A1 publication Critical patent/WO2009125501A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
    • H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain

Definitions

  • the present invention relates to a receiver for terrestrial digital broadcasting, for example.
  • a pilot carrier signal for facilitating estimation of transmission path transmission characteristics is used together with a data carrier signal for transmitting information data such as video and audio.
  • a pilot carrier signal called a distributed pilot (SP) signal (hereinafter referred to as “SP signal”) is defined.
  • SP signal is known to be superimposed at a specific position in the same space when assuming an OFDM symbol space consisting of two dimensions of carrier frequency and symbol time, and its complex amplitude, that is, the absolute value of the SP signal.
  • the amplitude and phase are also predetermined. Therefore, in a receiving apparatus that receives digital broadcasting according to these standards, the SP signal is used to estimate the transfer characteristics for each carrier of the radio wave propagation path, and based on such estimation results, correction processing related to the received signal, etc. Can be performed.
  • the conventional receiver calculates the transfer function for each detection signal of the pilot carrier signal arranged in the OFDM signal symbol space, and the transfer function A two-dimensional data space is generated by performing a two-dimensional Fourier transform on the impulse delay time and the symbol frequency. Further, the conventional receiving apparatus extracts a predetermined region of the two-dimensional data space by a filter extraction region, performs a two-dimensional inverse Fourier transform on the carrier frequency and symbol time for the data included in the extraction region, and obtains an estimated transfer function. It was generated (see Patent Document 1). Japanese Patent No. 3820311
  • the problems to be solved by the present invention include the above-mentioned problems as an example.
  • the invention according to claim 1 is characterized in that a pilot signal having a specific known complex amplitude is transmitted using a transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data as a transmission unit.
  • a received signal obtained by receiving an OFDM signal superimposed on a predetermined carrier in a symbol and detecting a carrier group included in a plurality of consecutive transmission symbols is converted into a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the characteristic estimation unit is configured to calculate a pilot signal transmission characteristic for a pilot signal arranged in the two-dimensional data region, and to perform a two-dimensional Fourier transform on the pilot signal transmission characteristic to obtain a transmission line delay time and a transmission line Transform means for generating two-dimensional Fourier transform data in a two-dimensional space corresponding to the fluctuation frequency, and supply means for calculating a two-dimensional filter window for allowing a group of data in a specific region of the two-dimensional Fourier transform data to pass through Filter means for selectively extracting a data group in the specific region determined based on the two-dimensional filter window, and performing a two-dimensional inverse Fourier transform on the selected and
  • the invention according to claim 6 is characterized in that a pilot signal having a specific known complex amplitude is transmitted with a transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data.
  • a received signal obtained by receiving an OFDM signal superimposed on a predetermined carrier in a symbol and detecting a carrier group included in a plurality of consecutive transmission symbols is converted into a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the transfer characteristic estimation step includes: a calculation step for calculating a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region; and a two-dimensional Fourier transform is performed on the pilot signal transfer characteristic to perform transmission.
  • a transform step for generating two-dimensional Fourier transform data in a two-dimensional space corresponding to a path delay time and a transmission path fluctuation frequency, and a two-dimensional filter for passing a data group in a specific region of the two-dimensional Fourier transform data A supply step for calculating a window; a filter step for selectively extracting a data group in the specific region determined based on the two-dimensional filter window; and a two-dimensional inverse Fourier transform for the selected and extracted data group 2D inverse Fourier transform data in 2D space corresponding to carrier frequency and symbol time Generating a reception signal transfer characteristic based on the generated data, wherein the calculation step calculates a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region A transfer characteristic calculating step for extracting the pilot signal transfer characteristic at a position where the pilot signal is superposed, excluding a carrier on which the pilot signal is not superposed, and a transfer characteristic extracting step for use in the conversion step Is provided.
  • the OFDM symbol is composed of 13 segments as shown in FIG. 1, and each segment includes, for example, a carrier of 108 waves in the case of transmission mode 1. Yes.
  • the partial receiving apparatus is a receiving apparatus that demodulates only the carrier included in segment 0 located in the center of the 13 segments.
  • FIG. 4 is a block diagram illustrating a configuration example of the receiving device 1 according to the first embodiment.
  • the receiving apparatus 1 mainly includes a symbol detection unit 11, a symbol storage unit 12, a frequency domain processing unit 13, a transfer characteristic estimation unit 20, and a data decoding unit 30.
  • the arrow which shows the flow of a signal in a figure shows the flow of the main signals between each component, For example, regarding signals, such as a response signal and a monitoring signal accompanying such a main signal, a figure. Including the case of transmission in the direction opposite to the arrow in the middle.
  • the arrows in the figure conceptually indicate the flow of signals between the components, and in an actual device, it is not necessary for each signal to be faithfully exchanged along the path indicated by the arrows. . Moreover, in an actual apparatus, it is not necessary that each component is divided faithfully as shown in FIG.
  • the symbol detection unit 11 detects a carrier group included in each symbol with respect to sequentially transmitted symbols, and obtains complex amplitudes (hereinafter referred to as “carrier amplitudes”) Sp, k of these carriers.
  • S p, k represents the p-th carrier amplitude of the k-th symbol
  • the symbol detection unit 11 is configured by each component circuit such as a tuner, an A / D converter, a transmission mode / guard interval ratio detector, a guard interval removal circuit, and an FFT circuit. It is not limited to cases.
  • the symbol storage unit 12 is a circuit that selects nX carrier amplitudes output from the symbol detection unit 11 and stores them for nY symbol times in the symbol time direction. . That is, for the carrier group of (2D region carrier width nX ⁇ 2D region symbol width nY) in the OFDM symbol space shown in FIG. 6, the carrier amplitude S p, q ( ⁇ nX / 2 ⁇ p ⁇ nX / 2) , K ⁇ nY ⁇ q ⁇ k). In the following description, these stored and held carrier amplitudes are considered as a two-dimensional array ⁇ S p, q : (p, q) ⁇ Z 2D ⁇ in the (p, q) space.
  • p is a carrier index
  • q is a symbol index
  • each index corresponds to a carrier frequency and a symbol time.
  • the Z 2D range is in the carrier frequency direction, ⁇ nX / 2 ⁇ p ⁇ nX / 2
  • the frequency domain processing unit 13 performs frame synchronization processing, TMCC demodulation processing, etc., generates symbol count values from 0 to 203 for each symbol, and stores them in the symbol storage unit 12.
  • the symbol storage unit 12 stores the symbol count value provided from the frequency domain processing unit 13 in association with each symbol provided from the symbol detection unit 11.
  • the data decoding unit 30 further includes an estimation region Z EST ( ⁇ wX / 2 ⁇ p ⁇ wX / 2, k ⁇ nY / 2) shown in FIG. 6 from the carrier amplitude data group stored in the symbol storage unit 12.
  • the carrier amplitude ⁇ S p, q : (p, q) ⁇ Z EST ⁇ within ⁇ wY / 2 ⁇ q ⁇ k ⁇ nY / 2 + wY / 2) is extracted, and this is subjected to decoding processing.
  • the transfer characteristic estimation unit 20 calculates an estimated transfer characteristic with respect to the carrier amplitude in the estimation region Z EST based on the carrier amplitude stored in the symbol storage unit 12, and supplies this to the data decoding unit 30 It is.
  • the data decoding unit 30 performs processing such as equalization, deinterleaving, and Reed-Solomon decoding based on the carrier amplitude from the symbol storage unit 12 and the estimated transfer characteristic from the transfer characteristic estimation unit 20, and is obtained as a result. Output received data.
  • the transfer characteristic estimation unit 20 estimates transfer characteristics for consecutive wY symbol intervals, so it does not need to operate at the timing of each received symbol, and is once per wY symbol reception. Should work. Such operation timing is the same for the operation timing of the data decoding unit 30.
  • the transfer characteristic estimation unit 20 mainly includes an SP transfer characteristic calculation unit 21, a two-dimensional Fourier transform unit 22, a two-dimensional filter circuit 23, a two-dimensional inverse Fourier transform circuit 24, and an estimated transfer characteristic output.
  • the circuit 25 and the filter coefficient determination circuit 26 are included.
  • these circuits are referred to as a calculation unit 21, a conversion unit 22, a filter circuit 23, an inverse conversion unit 24, an output circuit 25, and a determination circuit 26, respectively, in order to simplify the description.
  • the calculation unit 21 and the inverse conversion unit 24, which are specific configurations in the present embodiment will be mainly described, and other circuit configurations will be described in the operation description.
  • the calculation circuit 21 includes an SP transfer characteristic calculation circuit 21a and an SP transfer characteristic extraction circuit 21b.
  • the SP transfer characteristic extraction circuit is referred to as an “extraction circuit”.
  • the SP transfer characteristic calculation circuit 21a extracts only the carrier amplitude related to the SP signal from the carrier amplitude supplied from the symbol storage unit 12, and divides this by the known transmission complex amplitude value. As a result, the SP transfer characteristic calculation circuit 21a can obtain the transfer characteristic ⁇ H p, q : (p, q) ⁇ Z 2D ⁇ for the SP signals scattered in the (p, q) space.
  • the extraction circuit 21b provides the conversion unit 22 with SP signal transfer characteristics for every three carrier indexes except for a carrier index on which no SP signal is superimposed.
  • the inverse transform unit 24 includes an inverse Fourier transform circuit 24a, a multiplier circuit 24b, and a Fourier transform circuit 24c.
  • the inverse Fourier transform circuit 24a performs an inverse Fourier transform process on the data in the symbol index direction over all carrier indexes.
  • the multiplication circuit 24b multiplies each carrier by a complex twiddle factor coefficient (exp ( ⁇ j ⁇ o t)). Note that j represents an imaginary unit, and exp (x) represents a complex function.
  • the Fourier transform circuit 24 c calculates an estimated transfer characteristic by performing a Fourier transform process on the data in the carrier index direction over all symbol indexes, and provides it to the output circuit 25. That is, the multiplication circuit 24b and the Fourier transform circuit 24c perform the calculation in the carrier index direction.
  • the transfer characteristic estimation unit 20 As described above, in the terrestrial digital broadcasting of the ISDB-T standard, the position of the SP signal in the carrier arrangement in the OFDM symbol space and the complex amplitude value of the SP signal at the time of transmission are determined in advance. Therefore, the calculation unit 21 extracts only the carrier amplitude related to the SP signal from the carrier amplitudes supplied from the symbol storage unit 12, and divides this by the known transmission complex amplitude value. Thereby, the transfer characteristics ⁇ H p, q : (p, q) ⁇ Z 2D ⁇ can be obtained for the SP signals scattered in the (p, q) space. Such a calculation procedure is as follows.
  • the SP transfer characteristic calculation circuit 21a shown in FIG. 9 extracts only the carrier amplitude related to the SP signal from the carrier amplitude supplied from the symbol storage unit 12, and this is extracted as a known transmission complex amplitude value. Divide by.
  • the SP transfer characteristic calculation circuit 21a performs the following operation on data carrier signals other than SP signals.
  • H p, q 0
  • the transfer function ⁇ H p, q ⁇ is defined as follows.
  • the SP transfer characteristic calculation circuit 21a can obtain the transfer characteristic ⁇ H p, q : (p, q) ⁇ Z 2D ⁇ for the SP signals scattered in the (p, q) space.
  • the extraction circuit 21 b supplies the SP signal transfer characteristic ⁇ H p, q ⁇ for each three carrier index to the conversion unit 22 except for the carrier index on which no SP signal is superimposed.
  • the SP signal superposed at a rate of 1 on 12 carriers is present only every 3 carriers as shown in FIG.
  • the SP signal in which the superposition position has been cyclically changed by three carriers for each symbol has its superposition position cyclically changed by one carrier for each symbol.
  • the SP signal transfer characteristic ⁇ H of 2D-FFT region Z ′ 2D ( ⁇ mX / 2 ⁇ p ⁇ mX / 2, k ⁇ nY ⁇ q ⁇ k) ' p, q : (p, q) ⁇ Z' 2D ⁇ is provided to the conversion unit 22.
  • the range of the estimation region Z ′ EST is ( ⁇ vX / 2 ⁇ p ⁇ vX / 2, k ⁇ nY / 2 ⁇ wY / 2 ⁇ q ⁇ knY / 2 + wY / 2).
  • the transform unit 22 performs a two-dimensional Fourier transform on the SP signal transfer characteristic ⁇ H ′ p, q ⁇ in the (p, q) space, and performs this on the SP signal transfer characteristic ⁇ h in the (m, n) space.
  • m, n (m, n) ⁇ Z ′ TRA ⁇ That is, for the carrier frequency direction (p direction) in (p, q) space, IFFT (Inverse Fast Fourier Transform) processing is performed to convert the frequency domain to the time domain, and for the symbol time direction (q direction), The time domain is converted into the frequency domain by performing FFT (Fast Fourier Transform) processing.
  • FFT Fast Fourier Transform
  • the m-axis direction corresponds to the time dimension
  • the n-axis direction corresponds to the frequency dimension.
  • the region Z ′ 2D in the (p, q) space corresponds to the region Z ′ TRA converted in the (m, n) space, and this region is -MX / 2 ⁇ m ⁇ mX / 2
  • this region is -MX / 2 ⁇ m ⁇ mX / 2
  • ⁇ nY / 2 ⁇ n ⁇ nY / 2 Is defined as
  • the determination circuit 26 calculates a two-dimensional filter window ⁇ W m, n ⁇ based on the data group that has been Fourier-transformed in the (m, n) space by the conversion unit 22. As described in Patent Document 1, the power spectrum distribution of the transmission path transfer characteristic tends to be concentrated in a specific region on the (m, n) space according to the nature of the transmission path. Therefore, the decision circuit 26 calculates a real coefficient two-dimensional filter window ⁇ W m, n ⁇ having a pass band covering this area, and supplies it to the filter circuit 23.
  • window functions having various shapes such as a rectangular window and a cosine descent window can be applied.
  • the decision circuit 26 should set the passband of the two-dimensional filter window adapted to the reception environment.
  • the filter circuit 23 is a circuit that performs a predetermined filtering process on the data group that has been Fourier-transformed in the (m, n) space by the conversion unit 22.
  • the filter circuit 23 multiplies the SP signal transfer characteristic ⁇ h m, n ⁇ in the (m, n) space by the real coefficient two-dimensional filter window ⁇ W m, n ⁇ provided by the decision circuit 26 ( m, n) Calculate the estimated transfer characteristic ⁇ g m, n ⁇ in space.
  • the estimated transfer characteristic ⁇ g m, n ⁇ calculated by the filter circuit 23 is output to the inverse conversion unit 24 in the next stage.
  • the inverse transform unit 24 performs a two-dimensional inverse Fourier transform, which is an inverse process of the two-dimensional Fourier transform, on the estimated transfer characteristic ⁇ g m, n ⁇ provided from the filter circuit 23, and from ⁇ g m, n ⁇ to ( p, q) Estimated transfer characteristic ⁇ Gp , q : (p, q) ⁇ Z 2D ⁇ in space is calculated.
  • the inverse transform unit 24 performs transform from the frequency domain to the time domain by performing an inverse Fourier transform process over the entire carrier index in the symbol index direction (n-axis direction) by the inverse Fourier transform circuit 24a shown in FIG.
  • the multiplication circuit 24b multiplies the complex twiddle factor coefficient (exp ( ⁇ j ⁇ o t)) so that a predetermined phase rotation occurs in the mX section in the time domain in the carrier index direction (m-axis direction).
  • j represents an imaginary unit
  • exp (x) represents a complex exponential function.
  • the Fourier transform circuit 24c performs transform from the time domain to the frequency domain by performing a Fourier transform process in the carrier index direction (m-axis direction).
  • the estimated transfer characteristic calculated by the inverse transform unit 24 is ⁇ G ′ p, q : (P, q) ⁇ Z ′ 2D ⁇ and the estimated region is Z ′ EST .
  • the region where the transfer characteristic estimation unit 20 should estimate the transfer characteristic is Z EST
  • the estimated region Z ′ EST is a region of 1/3 with respect to the carrier direction.
  • the inverse transform unit 24 of the present embodiment performs an inverse Fourier transform process in the symbol direction (n-axis direction) in the inverse Fourier transform circuit 24a.
  • the multiplication circuit 24b multiplies the carrier direction by a complex twiddle factor coefficient
  • the Fourier transform circuit 24c performs Fourier transform in the carrier direction three times for each symbol.
  • the estimated transfer characteristic ⁇ G p, q (p, q) ⁇ Z 2D ⁇ including the range of the estimated region Z EST is calculated.
  • the estimated transfer characteristic ⁇ G p, q ⁇ calculated by the inverse conversion unit 24 is provided to the output circuit 25.
  • the output circuit 25 extracts the estimated transfer characteristic ⁇ G p, q : (p, q) ⁇ Z EST ⁇ corresponding to the carrier amplitude of the estimation region Z EST extracted by the data decoding unit 30 and extracts such extracted data. Is provided to the data decoding unit 30.
  • the reason why the estimated transfer characteristic for the entire Z 2D region is not output from the transfer characteristic estimating unit 20 to the data decoding unit 30 is that the estimated transfer characteristic is changed due to the influence of the end of the region in the peripheral part of the (p, q) space. This is because an error occurs.
  • the specific values of the two-dimensional region carrier width nX and the two-dimensional region symbol width nY values larger than those in the present embodiment may be used.
  • FIG. 13 is a diagram showing a power spectrum distribution of the transmission path transfer characteristic of the SP signal described in FIG. 9 of Patent Document 1.
  • the m-axis direction is time, and represents the delay time to the effective symbol length Te.
  • the n-axis direction is a frequency and represents a Doppler frequency up to the symbol transmission frequency Fa.
  • the transmission path transmission characteristic is repeated in the m-axis direction in 1/3 period of the effective symbol length Te.
  • the SP signal transfer characteristic can be observed only in a form that is folded back to 1/3 period of the effective symbol length Te. Therefore, the effective SP signal transfer characteristic is only the Te / 3 section with respect to the m-axis direction.
  • 2 ⁇ represents a delay time up to 1/3 of the effective symbol length Te in the m-axis direction, as shown in FIG.
  • the frequency of the symbol transmission frequency Fa is shown as in the case shown in FIG.
  • the transfer characteristic is calculated over the Te / 3 width that is an effective section in the time direction (m-axis direction) of the SP signal transfer characteristic, the accuracy of the estimated transfer characteristic is calculated.
  • the estimated transfer characteristic can be calculated with a smaller amount of calculation processing without lowering the.
  • FIG. 15 is a flowchart illustrating a procedure example of 2D inverse Fourier transform processing.
  • the inverse Fourier transform process is executed by the inverse Fourier transform unit 24.
  • Symbol direction inverse Fourier transform processing indicates processing for performing inverse Fourier transform in the symbol direction for the (p, q) space (step S100).
  • the carrier direction Fourier transform process also referred to as C-IFFT process indicates a process of performing a Fourier transform in the carrier direction for the (p, q) space (step S200).
  • each calculation formula is expressed as follows.
  • FFT indicates a function for performing Fourier transform
  • IFFT indicates a function for performing inverse Fourier transform
  • FIG. 16 is a flowchart showing a procedure example of the symbol direction inverse Fourier transform process shown in FIG.
  • the symbol “ ⁇ ” indicates that the value or expression on the right side is set to the variable on the left side.
  • step S102 an inverse Fourier transform process is performed on the symbol direction counter value n.
  • the step S102 is repeated in the carrier direction two-dimensional region carrier width mX times (steps S101, S103, S104).
  • FIG. 17 is a flowchart showing a procedure example of the carrier direction Fourier transform process shown in FIG.
  • step S300 a twiddle factor multiplication process is executed.
  • a twiddle factor coefficient based on the repetition index k and the carrier index m is multiplied in the carrier direction. Details of the twiddle factor multiplication process will be described later.
  • step S203 a Fourier transform process is performed on the carrier index m.
  • step S400 an estimated area extraction process is executed. This estimated area extraction process extracts estimated transfer characteristics of the estimated area. In this estimated area extraction processing, only the estimated transfer characteristic of the estimated area width vX (corresponding to the estimated area carrier width wX / 3 in FIG. 6) shown in FIG. 11 is extracted and stored in a memory (not shown).
  • steps S300, S203, and S400 are repeated three times for each symbol as an example (steps S202, S204, and S205).
  • the Fourier transform process in the carrier direction is repeatedly executed over the two-dimensional area symbol width nY (steps S201, S206, S207), but is repeatedly executed over the estimated area symbol width wY. Also good.
  • FIG. 18 is a flowchart showing a specific procedure example of the twiddle factor multiplication process shown in FIG.
  • step S302 the complex exponent ph of the twiddle factor coefficient is calculated based on the repetition count index k and the carrier index m.
  • step S303 the variable z is calculated.
  • the symbol “&” represents, for example, that a logical product operation is performed on a variable or the like described on the left and right of each bit.
  • step S304 the twiddle factor exp (ph) is multiplied using the complex exponent ph calculated in step S302.
  • the target carrier calculation variable c represents a calculation variable for specifying a carrier to be processed.
  • step S404 a variable z is set.
  • step S405 the estimated transfer characteristic calculated for each carrier direction Fourier transform is stored in a memory (not shown) for each three carrier index.
  • step S406 the target carrier calculation variable c is incremented by 3 so that the carrier to be targeted is every three carriers.
  • Steps S404, S405, and S406 as described above are executed as an example from ⁇ nT / 2 to nT / 2 every three carriers (steps S401, S402, S403, S407, and S408).
  • the receiving apparatus 1 is configured so that a pilot signal having a specific known complex amplitude with the transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data as a transmission unit is the transmission symbol. 2 received in a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the received signal obtained by receiving the OFDM signal superimposed on a predetermined carrier and detecting the carrier group included in a plurality of consecutive transmission symbols.
  • the transfer characteristic estimation unit 20 includes a calculation unit 21 (SP transfer characteristic calculation unit) that calculates a pilot signal transfer characteristic with respect to a pilot signal arranged in the two-dimensional data region;
  • a conversion means 22 (2D Fourier transform unit) that performs two-dimensional Fourier transform on the pilot signal transfer characteristics to generate two-dimensional Fourier transform data in a two-dimensional space corresponding to the transmission line delay time and the transmission line fluctuation frequency;
  • Supply means 26 filter coefficient setting circuit for calculating a two-dimensional filter window for passing a data group in the specific area of the two-dimensional Fourier transform data, and the specific area determined based on the two-dimensional filter window
  • Filter means 23 (2D filter circuit) for selecting and
  • the calculating means 21 includes a transfer characteristic calculating means 21a (SP transfer characteristic calculating circuit) for calculating a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region, The pilot signal transmission characteristic for every three carriers is extracted except for the carrier on which the pilot signal is not superimposed, and is provided with transmission characteristic extraction means 21b (SP transmission characteristic extraction circuit) for use in the conversion means 22.
  • a transfer characteristic calculating means 21a SP transfer characteristic calculating circuit
  • the pilot signal transmission characteristic for every three carriers is extracted except for the carrier on which the pilot signal is not superimposed, and is provided with transmission characteristic extraction means 21b (SP transmission characteristic extraction circuit) for use in the conversion means 22.
  • a pilot signal having a specific known complex amplitude is superimposed on a predetermined carrier in the transmission symbol with a transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data as a transmission unit.
  • a received signal obtained by receiving a received OFDM signal and detecting a carrier group included in a plurality of consecutive transmission symbols is arranged in a two-dimensional data region on a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the transfer characteristic estimation step for estimating the received signal transfer characteristic for each of the received signals based on the pilot signal arranged in the two-dimensional data region, the received signal and the received signal transfer characteristic
  • a data decoding step for decoding the transmission data.
  • the characteristic estimation step includes a calculation step for calculating a pilot signal transmission characteristic for a pilot signal arranged in the two-dimensional data region, and a two-dimensional Fourier transform is performed on the pilot signal transmission characteristic to obtain a transmission line delay time and a transmission line A conversion step for generating two-dimensional Fourier transform data in a two-dimensional space corresponding to a variable frequency, and a supply step for calculating a two-dimensional filter window for allowing a group of data in a specific region to pass through the two-dimensional Fourier transform data.
  • a filter step for selectively extracting a data group in the specific region determined based on the two-dimensional filter window, and performing a two-dimensional inverse Fourier transform on the selected and extracted data group, Generate two-dimensional inverse Fourier transform data in a two-dimensional space corresponding to the symbol time, and generate the data Generating a reception signal transfer characteristic based on the received data, wherein the calculation step calculates a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region And a transfer characteristic extracting step for extracting the pilot signal transfer characteristic for every three carriers except for a carrier on which the pilot signal is not superimposed and for use in the process of the conversion step.
  • the estimated transfer characteristic can be calculated with a smaller amount of calculation processing without lowering the accuracy of the estimated transfer characteristic.
  • FIG. 20 shows the power spectrum distribution ⁇
  • the (m, n) space corresponds to the OFDM symbol space.
  • the SP signal transfer characteristic ⁇ hm , n ⁇ calculated by performing the 2D Fourier transform process in the conversion unit 22 has the following properties due to the regular arrangement of the SP signals.
  • the SP signal transfer characteristic ⁇ h m, n ⁇ corresponds to h (m, n).
  • the variable mode represents the transmission mode, for example, 0 for mode 1, 1 for mode 2, and 2 for mode 3.
  • the function floor (x) is a function for calculating the maximum integer value less than or equal to x.
  • equation (1) shows that an arbitrary SP signal transfer characteristic ⁇ h m, n ⁇ in the (m, n) space can be easily calculated from the SP signal transfer characteristic of the region H. Therefore, equation (1) means that the SP signal transfer characteristic ⁇ hm , n ⁇ is composed of one independent variable group and three dependent variable groups in the (m, n) space. This property is referred to as property A as a name.
  • the calculation processing amount of the conversion unit 22 can be further reduced by devising only the SP signal transfer characteristic corresponding to the region H in FIG.
  • the second embodiment described below is intended to further reduce the amount of calculation processing of the conversion unit 22 by using the property A.
  • FIG. 21 is a block diagram illustrating a configuration example of the receiving device 1a according to the second embodiment.
  • the receiving device 1a according to the second embodiment has substantially the same configuration as the receiving device 1 according to the first embodiment and performs substantially the same operation.
  • the same configurations and operations are denoted by the same reference numerals as in FIGS. 1 to 19 in the first embodiment, and the description thereof is omitted. In the following description, differences will be mainly described. .
  • the receiving device 1a according to the second embodiment includes a transfer characteristic estimation unit 20a having substantially the same function as the transfer characteristic estimation unit 20 instead of the transfer characteristic estimation unit 20 according to the first embodiment.
  • FIG. 22 is a block diagram showing a configuration example of the transfer characteristic estimation unit 20a shown in FIG.
  • the transfer characteristic estimation unit 20a according to the second embodiment mainly differs from the transfer characteristic estimation unit 20 according to the first embodiment mainly in a part of the function of the calculation unit 21 and the configuration and function of the conversion unit 22. .
  • the SP transfer characteristic calculation circuit 21a of the calculation unit 21 extracts the transfer characteristic ⁇ H p, q ⁇ of the SP signal for every three carrier indexes, for example, but this is the second embodiment. Then, the SP transfer characteristic extraction circuit 21a extracts the transfer characteristic ⁇ H p, q ⁇ of only the SP signal for every 12 carrier indexes, for example.
  • the calculating unit 21 extracts only the carrier amplitude related to the SP signal from the carrier amplitude supplied from the symbol storage unit 12 by the SP transfer characteristic calculating circuit 21a shown in FIG. Divide by value.
  • ⁇ R p, q ⁇ is a known transmission complex amplitude value of the SP signal.
  • the SP transfer characteristic calculation circuit 21a performs the following operation on data carrier signals other than SP signals.
  • H p, q 0
  • the transfer function ⁇ H p, q ⁇ is defined as follows.
  • the SP transfer characteristic calculation circuit 21a can obtain the transfer characteristic ⁇ H p, q : (p, q) ⁇ Z 2D ⁇ for the SP signals scattered in the (p, q) space.
  • the extraction circuit 21b extracts only the SP signal transfer characteristic ⁇ H p, q ⁇ at the SP signal position and supplies it to the converter 22x. Specifically, the extraction circuit 21b extracts the SP signal transfer characteristic only at the SP signal position shown in FIG. 24, and supplies the SP signal transfer characteristic to the conversion unit 22x in the form of packing in the carrier direction as shown in FIG.
  • the SP signal transfer characteristics ⁇ H ′′ p, q ⁇ provided to the conversion unit 22x are arranged in the OFDM space as shown in Fig. 23.
  • Range of 2D Fourier transform region in the second embodiment Z " 2D is ⁇ kX / 2 ⁇ p ⁇ kX / 2; k ⁇ nY ⁇ q ⁇ k Is defined.
  • the estimated area Z " EST is ⁇ uX / 2 ⁇ p ⁇ uX / 2; k ⁇ nY / 2 ⁇ wY / 2 ⁇ q ⁇ k ⁇ nY / 2 + wY / 2 Is defined.
  • the conversion unit 22x performs a two-dimensional Fourier transform on the SP signal transfer characteristic ⁇ H " p, q ⁇ in the (p, q) space provided from the SP transfer characteristic calculation unit 21, and converts this to (m, n ) SP signal transfer characteristics in space ⁇ h m, n : (m, n) ⁇ Z ′ TRA ⁇
  • the conversion unit 22 x outputs this to the filter circuit 23 and the decision circuit 26.
  • the inverse Fourier transform circuit 22a and the multiplier circuit 22b shown in FIG. 26 perform processing in the carrier index direction, and the Fourier transform circuit 22c performs processing in the symbol index direction.
  • the SP signal transfer characteristic provided to the converter 22x is degenerated in the carrier direction as shown in FIG. 25, and is different from the superimposed position in the (p, q) space as originally shown in FIG.
  • the SP signal superposition position is not shifted in the carrier direction every time. Therefore, the transform unit 22x performs the inverse Fourier transform process in the carrier direction for each symbol by the inverse Fourier transform circuit 22a using the frequency shift theorem described above, and then multiplies a predetermined complex twiddle factor coefficient in the multiplier circuit 22b. As a result, a result that is relatively shifted by a desired position on the time axis before the inverse Fourier transform processing is calculated.
  • the complex twiddle factor coefficient is determined based on the symbol count value and transmission mode associated with each symbol provided from the symbol storage unit 12. Therefore, the complex factor coefficient is updated for each symbol, and in the case of the present embodiment, the cycle is 4 symbols.
  • the SP signal transfer characteristic ⁇ h ′ m, n ⁇ in the (m, n) space is calculated by performing Fourier transform processing in the symbol direction.
  • 2 ⁇ of the SP signal transfer characteristic ⁇ h ′ m, n ⁇ calculated by the converter 22x is the effective symbol length Te in the m-axis direction.
  • the delay time is up to 1/12, and in the n-axis direction, the frequency is equal to the symbol transmission frequency Fa.
  • the SP signal transfer characteristic ⁇ h ′ m, n ⁇ calculated by the conversion unit 22x corresponds to the area H of FIG. 20 used in the description of the property A described above.
  • conversion unit SP signal transfer characteristic calculated in 22x ⁇ h 'm, n ⁇ from the calculated conversion unit 22 in the first embodiment SP signal transfer characteristic ⁇ h m, n ⁇ easily Can be converted. That is, the converter 22x outputs the SP signal transfer characteristic ⁇ h m, n ⁇ to the filter circuit 23 and the determination circuit 26.
  • the determination circuit 26, the filter circuit 23, the inverse conversion unit 24, and the output circuit 26 may be processed in the same manner as in the first embodiment. Since the determination circuit 26, the filter circuit 23, the inverse conversion unit 24, and the output circuit 25 are the same as those in the first embodiment, description thereof is omitted.
  • FIG. 28 is a flowchart showing a procedure example of 2D Fourier transform processing.
  • This 2D Fourier conversion process represents a process performed by the conversion unit 22x.
  • the 2D Fourier transform process includes a carrier direction inverse Fourier transform process (corresponding to step S500) and a symbol direction Fourier transform process (corresponding to step S600).
  • the carrier direction inverse Fourier transform process as shown in FIG. 29, the Fourier transform process (step S501) is repeatedly performed along the symbol direction (steps S502 and S503).
  • FIG. 30 is a flowchart showing a procedure example of the carrier direction inverse Fourier transform process shown in FIG.
  • step S602 the shift amount s in the carrier direction for each symbol is calculated based on the transmission mode mode and the symbol count value symco.
  • the transmission mode mode is a variable that is, for example, 0 in mode 1, 1 in mode 2, and 2 in mode 3.
  • step S603 a Fourier transform process in the carrier direction is performed.
  • step S605 the complex exponent ph of the twiddle factor coefficient is calculated based on the shift amount s calculated in step S602 and the carrier index m.
  • step S607 ⁇ H " z, q ⁇ (corresponding to H" (z, q)) subjected to the Fourier transform is multiplied by a twiddle factor exp (ph). The above process is repeated kX times in the carrier direction and nY times in the symbol direction.
  • the SP signal transfer characteristic ⁇ H p, q ⁇ provided to the conversion unit 22x is limited in the calculation unit 21, and the calculation is devised in the conversion unit 22x. As compared with the above, the amount of calculation can be further reduced without degrading the accuracy of the estimated transfer characteristic.
  • the receiving apparatus 1a uses the transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data as a transmission unit, and a pilot signal having a specific known complex amplitude is the transmission symbol. 2 received in a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the received signal obtained by receiving the OFDM signal superimposed on a predetermined carrier and detecting the carrier group included in a plurality of consecutive transmission symbols.
  • a signal detector 11 symbol detector arranged in the two-dimensional data region, and a transfer characteristic estimator for estimating a received signal transfer characteristic for each of the received signals based on a pilot signal arranged in the two-dimensional data region 20 and a data decoding unit 30 for decoding the transmission data based on the received signal and the received signal transfer characteristic
  • the transfer characteristic estimation unit 20 includes a calculation unit 21 (SP transfer characteristic calculation unit) that calculates a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region; A conversion unit 22x (2D Fourier transform unit) that performs two-dimensional Fourier transform on the pilot signal transfer characteristics to generate two-dimensional Fourier transform data in a two-dimensional space corresponding to the transmission line delay time and the transmission line fluctuation frequency; Supply means 26 (filter coefficient setting circuit) for calculating a two-dimensional filter window for passing a data group in the specific area of the two-dimensional Fourier transform data, and the specific area determined based on the two-dimensional filter window Filter means 23 (2D filter circuit) for selectively extracting
  • a pilot signal having a specific known complex amplitude is superimposed on a predetermined carrier in the transmission symbol with a transmission symbol generated by orthogonally modulating a plurality of carriers based on transmission data as a transmission unit.
  • a received signal obtained by receiving a received OFDM signal and detecting a carrier group included in a plurality of consecutive transmission symbols is arranged in a two-dimensional data region on a two-dimensional space corresponding to the carrier frequency and symbol time.
  • the transfer characteristic estimation step for estimating the received signal transfer characteristic for each of the received signals based on the pilot signal arranged in the two-dimensional data region, the received signal and the received signal transfer characteristic
  • a data decoding step for decoding the transmission data.
  • the characteristic estimation step includes a calculation step for calculating a pilot signal transmission characteristic for a pilot signal arranged in the two-dimensional data region, and a two-dimensional Fourier transform is performed on the pilot signal transmission characteristic to obtain a transmission line delay time and a transmission line A conversion step for generating two-dimensional Fourier transform data in a two-dimensional space corresponding to a variable frequency, and a supply step for calculating a two-dimensional filter window for allowing a group of data in a specific region to pass through the two-dimensional Fourier transform data.
  • a filter step for selectively extracting a data group in the specific region determined based on the two-dimensional filter window, and performing a two-dimensional inverse Fourier transform on the selected and extracted data group, Generate two-dimensional inverse Fourier transform data in a two-dimensional space corresponding to the symbol time, and generate the data Generating a reception signal transfer characteristic based on the received data, wherein the calculation step calculates a pilot signal transfer characteristic for a pilot signal arranged in the two-dimensional data region And a transfer characteristic extracting step for extracting the pilot signal transfer characteristic at a position where the pilot signal is superimposed, except for a carrier on which the pilot signal is not superimposed, and for performing the process of the conversion step. And
  • the estimated transfer characteristic can be calculated with a smaller amount of calculation processing without lowering the accuracy of the estimated transfer characteristic as compared with the first embodiment.
  • the converting means 22x (2D Fourier transform unit) further uses the frequency shift theorem and is based on the pilot signal transmission characteristics for every 12 carriers.
  • the two-dimensional Fourier transform data is generated, and the generation means 24 (2D inverse Fourier transform circuit) uses a frequency shift theorem, and based on the data group selected and extracted, A reception signal transfer characteristic is calculated.
  • the converting means 22x (2D Fourier converter) further multiplies the pilot signal transmission characteristics for every 12 carriers by a twiddle factor to The dimensional Fourier transform data is generated, and the generation means 24 (2D inverse Fourier transform circuit) multiplies the selected and extracted data group by a twiddle factor to calculate the reception signal transfer characteristic in the two-dimensional data area.
  • the calculation unit 21 calculates the SP signal transfer characteristic ⁇ H p, q ⁇ in the (p, q) space as in the above embodiment. Then, the SP transfer characteristic extraction circuit 21b extracts the SP signal transfer characteristic ⁇ H " p, q ⁇ only for the carrier position of the SP signal (see FIG. 24), and SP signal transfer characteristics (see FIG. 25) packed in the carrier direction. Is provided to the converter 22x.
  • the conversion unit 22x performs 2D Fourier transform processing on the SP signal transfer characteristics provided from the calculation unit 21.
  • FIG. 31 shows a flowchart of the conversion unit 22x when an SP signal exists at the origin (0, 0) in the (p, q) space.
  • the 2D Fourier transform processing indicates carrier direction inverse Fourier transform processing (corresponding to the illustrated C-IFFT processing step S500) and symbol direction Fourier transform processing (corresponding to the illustrated S-IFFT processing step S600).
  • FIG. 32 is a flowchart showing a procedure example of the inverse Fourier transform process (step S500) in the carrier direction. This flowchart is executed by the conversion unit 22x.
  • step S522 a value that is incremented by 1 every time the index is incremented by 4 in the symbol index q-axis direction is calculated.
  • step S524 an index to be circulated in the carrier index p-axis direction is calculated based on the value calculated in step S522.
  • step S525 the data that has been circulated in the carrier index p-axis direction is stored in the temporary storage area temp (pa).
  • the process of step S525 is a process of changing the top address (origin) of data used for inverse Fourier transform, and does not necessarily require the temporary storage area temp (pa).
  • steps S524 and S525 are repeatedly executed over the two-dimensional region carrier width kX (S526 and S527).
  • step S528 an inverse Fourier transform process is performed in the carrier direction.
  • steps S522 to S528 are repeatedly executed over the two-dimensional symbol width nY (S529, S530).
  • FIG. 33 is a flowchart showing an example of the procedure of Fourier transform processing in the symbol direction. This flowchart is executed by the conversion unit 22.
  • step S621 the carrier index m is initialized.
  • step S622 a Fourier transform process in the symbol direction is performed.
  • step S623 an offset value ma for circulating data in the symbol index q-axis direction is calculated.
  • step S625 the index na to which data is circulated in the symbol index q-axis direction is calculated.
  • step S626 the data after Fourier transformation in the symbol direction is circulated in the symbol index q-axis direction to calculate the SP signal transfer characteristic ⁇ hm , na ⁇ .
  • steps S625 and S626 are repeatedly executed over the two-dimensional area symbol width nY (S627, S628).
  • steps S622 to S628 are executed over the two-dimensional region carrier width mX (S629, S630).
  • the SP transfer characteristic extracting circuit 21b first extracts the SP signal transfer characteristic only at the SP carrier signal position, and the symbol direction To the conversion unit 22.
  • the transform unit 22 performs the Fourier transform process in the symbol direction first, it is possible to perform the 2D Fourier transform only by the index (address) operation without multiplying the complex twiddle factor coefficient as described above. .
  • FIG. 34 is a block diagram illustrating a configuration example of a receiving device 1x configured to divide the symbol storage unit 12 into a data carrier storage unit 12a and an SP carrier storage unit 12b in the receiving device 1 illustrated in FIG.
  • the receiving apparatus 1x shown in FIG. 34 has substantially the same configuration as that of the receiving apparatus 1 shown in FIG. 4 and the receiving apparatus 1a shown in FIG.
  • the data carrier storage unit 12a and the SP carrier storage unit 12b may be two storage regions secured by dividing the storage region of the symbol storage unit 12, or may be physically separated storage regions.
  • the symbol storage unit 12 may be divided into a data carrier storage unit 12a and an SP carrier storage unit 12b. Since other configurations are almost the same as those in the above embodiment, the following description will mainly focus on the data carrier storage unit 12a and the SP carrier storage unit 12b.
  • the frequency domain processing unit 13 performs frame synchronization processing, TMCC demodulation processing, and the like, and generates symbol count values from 0 to 203 for each symbol.
  • the symbol count value is provided to the data carrier storage unit 12a and the SP carrier storage unit 12b.
  • the data carrier storage unit 12a only the carrier sequence used in the data decoding unit 30 is selected for each symbol and stored as a two-dimensional space in the carrier frequency direction and the symbol time direction. Further, the data carrier storage unit 12 a stores the symbol count value provided from the frequency domain processing unit 13 in association with each symbol provided from the symbol detection unit 11. The stored carrier group is provided to the data decoding unit 30.
  • the SP carrier storage unit 12a selects only the SP carrier sequence used by the transfer characteristic estimation unit 20 for each symbol and stores it as a two-dimensional space in the carrier frequency direction and the symbol time direction. Further, the symbol count value provided from the frequency domain processing unit 13 is stored in a form associated with each symbol provided from the symbol detection unit 11. The stored subcarrier group is provided to the transfer characteristic estimation unit 20.
  • the data decoding unit 30 performs processes such as equalization, deinterleaving, and Reed-Solomon decoding based on the carrier complex amplitude from the data carrier storage unit 12a and the estimated transfer characteristic from the transfer characteristic estimation unit 20, and outputs TS data. .
  • the SP carrier storage unit 12a selects only the SP carrier from the nX carriers in the channel center portion of the symbol comprising the carrier sequence provided from the symbol detection unit 11, and stores this for nY symbols in the symbol time direction. . That is, in the SP carrier storage unit 12a, the carrier amplitude ⁇ S p, q ⁇ of only the SP carrier in the hatched portion ( ⁇ nX / 2 ⁇ p ⁇ nX / 2, k ⁇ nY ⁇ q ⁇ k) in the OFDM space of FIG. Is retained. As shown in FIG. 35, the carrier index in the carrier frequency direction is p, and the symbol index in the symbol time direction is q.
  • the data carrier storage unit 12a only the data carrier is selected from the wX carriers in the channel center portion of the symbol composed of the carrier sequence provided from the symbol detection unit 11, and this is selected in the symbol time direction (two-dimensional region symbol width nY). / 2 + estimated area symbol width wY / 2) Stores over symbols. That is, the carrier amplitude ⁇ SD p, q ⁇ of only the data carrier of the lattice portion ( ⁇ wX / 2 ⁇ p ⁇ wX / 2, k ⁇ nY / 2 ⁇ wX / 2 ⁇ q ⁇ k) in the OFDM space of FIG. Retained.
  • the receiving device 1x in the embodiment further includes storage means for sequentially storing carrier amplitudes output from the signal detection means 11 (symbol detection unit), and the storage The means selects only the carrier sequence used in the data decoding means 30 (data decoding section) for each symbol, and stores it as a two-dimensional space in the carrier frequency direction and symbol time direction, the first storage means 12a (data carrier storage section) And a second storage unit 12b (SP carrier storage unit) for storing the symbol count value provided from the frequency domain processing unit 13 (frequency domain processing unit) for each symbol provided from the signal detection unit 11 ).
  • storage means for sequentially storing carrier amplitudes output from the signal detection means 11 (symbol detection unit), and the storage The means selects only the carrier sequence used in the data decoding means 30 (data decoding section) for each symbol, and stores it as a two-dimensional space in the carrier frequency direction and symbol time direction, the first storage means 12a (data carrier storage section) And a second storage unit 12b (SP carrier storage unit) for storing the symbol
  • the two-dimensional area carrier nX is set so that the total storage area of the data carrier storage unit 12a and the SP carrier storage unit 14 is constant regardless of the transmission mode.
  • the two-dimensional area symbol width nY may be variable with respect to the transmission mode.
  • the transfer characteristic estimation unit 20 variably sets each parameter depending on the transmission mode so that the storage capacity is constant regardless of the transmission mode.
  • the transfer characteristic estimation unit 20 prevents the estimated area carrier width wX ⁇ estimated area symbol width WY, 2D carrier width nX ⁇ 2D area symbol width nY from changing even if the transmission mode changes.
  • each parameter is set as shown in FIG.
  • ceil_pow (x) represents a function that returns the minimum factorial value of 2 that is greater than or equal to the value x.
  • nX (ceil_pow (wX / 3)) ⁇ 3
  • the supply unit 26 (filter coefficient determination circuit) further includes a carrier frequency width wX, nX and a symbol time width wY, nY as the two-dimensional filter window according to a transmission mode. It is characterized by providing.
  • the total storage area used in the data carrier storage unit 12a and the SP carrier storage unit 12b is made constant regardless of the transmission mode. can do.
  • FIG. 1 It is a block diagram which shows the specific structural example of the inverse transformation part shown in FIG. It is explanatory drawing which shows the structure of OFDM symbol space. It is explanatory drawing which shows the attribute of the carrier arrange
  • FIG. 5 is a block diagram illustrating a configuration example of a receiving device in which a symbol storage unit is divided into a data carrier storage unit and an SP carrier storage unit in the receiving device shown in FIG. 4. It is explanatory drawing which shows the structural example of OFDM symbol space. It is explanatory drawing which shows the structural example of OFDM symbol space. It is a figure which shows an example of each parameter set according to the transmission mode.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

[PROBLÈMES]  Bien qu'un récepteur conventionnel soit capable de calculer avec précision une caractéristique de transfert estimée par rapport à une amplitude de porteuse spécifique, il ne prend pas en compte les calculs nécessaires pour le traitement par transformée de Fourier 2D (2D inverse). [MOYEN POUR RÉSOUDRE LES PROBLÈMES]  Un circuit de calcul de caractéristique de transfert SP (21a) calcule une caractéristique de transfert de signal de commande par rapport à un signal de commande situé dans une zone de données bidimensionnelles. Un circuit d'extraction de caractéristique de transfert SP (21b) extrait la caractéristique de transfert du signal de commande à la position à laquelle les signaux de commande sont superposés, à l'exception de la porteuse dans laquelle les signaux de commande ne sont pas superposés, pour la fournir à une partie transformée de Fourier bidimensionnelle (22).
PCT/JP2008/057216 2008-04-12 2008-04-12 Récepteur et procédé de réception WO2009125501A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0575568A (ja) * 1991-01-17 1993-03-26 Fr Telecom 通信路の周波数応答の評価と限界判定を備えた時間周波数領域に多重化されたデイジタルデータをコヒレント復調するための装置
JP2002261729A (ja) * 2001-03-06 2002-09-13 Hitachi Ltd Ｏｆｄｍ受信装置
US20040086055A1 (en) * 1998-12-31 2004-05-06 Ye Li Pilot-aided channel estimation for OFDM in wireless systems
JP2005229466A (ja) * 2004-02-16 2005-08-25 Pioneer Electronic Corp 受信装置及び受信方法
WO2005122717A2 (fr) * 2004-06-10 2005-12-29 Hasan Sehitoglu Procedes et appareil a valeur de matrice destines au traitement de signaux
JP2006148387A (ja) * 2004-11-18 2006-06-08 Pioneer Electronic Corp Ｏｆｄｍ信号受信機及び受信方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0575568A (ja) * 1991-01-17 1993-03-26 Fr Telecom 通信路の周波数応答の評価と限界判定を備えた時間周波数領域に多重化されたデイジタルデータをコヒレント復調するための装置
US20040086055A1 (en) * 1998-12-31 2004-05-06 Ye Li Pilot-aided channel estimation for OFDM in wireless systems
JP2002261729A (ja) * 2001-03-06 2002-09-13 Hitachi Ltd Ｏｆｄｍ受信装置
JP2005229466A (ja) * 2004-02-16 2005-08-25 Pioneer Electronic Corp 受信装置及び受信方法
WO2005122717A2 (fr) * 2004-06-10 2005-12-29 Hasan Sehitoglu Procedes et appareil a valeur de matrice destines au traitement de signaux
JP2006148387A (ja) * 2004-11-18 2006-06-08 Pioneer Electronic Corp Ｏｆｄｍ信号受信機及び受信方法

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