WO2007139119A1 - Procédé et dispositif d'estimation de caractéristique pluri-chemin, procédé de réception, procédé de correction du signal de réception et dispositif - Google Patents

Procédé et dispositif d'estimation de caractéristique pluri-chemin, procédé de réception, procédé de correction du signal de réception et dispositif Download PDF

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Publication number
WO2007139119A1
WO2007139119A1 PCT/JP2007/060926 JP2007060926W WO2007139119A1 WO 2007139119 A1 WO2007139119 A1 WO 2007139119A1 JP 2007060926 W JP2007060926 W JP 2007060926W WO 2007139119 A1 WO2007139119 A1 WO 2007139119A1
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signal
multipath
procedure
chip
received
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PCT/JP2007/060926
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English (en)
Japanese (ja)
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Naoki Suehiro
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Naoki Suehiro
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Priority to JP2008517949A priority Critical patent/JP5261173B2/ja
Publication of WO2007139119A1 publication Critical patent/WO2007139119A1/fr

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    • 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
    • H04L25/0204—Channel estimation of multiple channels
    • 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

Definitions

  • Multipath characteristic estimation method and apparatus reception method, and reception signal correction method and apparatus
  • the present invention relates to a multipath characteristic estimation method and apparatus, a reception method, and a received signal correction method and apparatus, and more particularly to a multipath characteristic estimation method and apparatus using oversampling, a reception method, and a received signal correction.
  • the present invention relates to a method and an apparatus.
  • the present invention has been made in view of the above problems, and provides a reception signal correction method, a reception method, a reception signal correction device, and a reception device that accurately estimate the characteristics of a line that uses a broadband pilot signal. It is intended to provide.
  • the multipath characteristic estimation method of the present invention is such that the time length of each chip is abbreviated and an N-chip multipath characteristic measurement signal is received and the multipath characteristic of the line is According to the multipath characteristic estimation method for estimating characteristics, an oversampling procedure for sampling M (M is a natural number of 2 or more) times for each chip of the received multipath characteristic measurement signal, A discrete filter procedure for performing discrete filter processing by the filter, and the multipath characteristics oversampled by the oversampling procedure.
  • the multipath characteristic of the line can be estimated by filtering the signal for measuring the characteristic by the discrete filter procedure.
  • the multinos characteristic estimation method of the present invention receives the N-chip multipath characteristic measurement signal with the time length of each chip being abbreviated.
  • the received multipath characteristic measurement signal is shifted and sampled N times in M (M is a natural number of 2 or more) different periods.
  • Multipath characteristics of the line are obtained by performing Nth-order discrete filtering on the sampling procedure and the M signals obtained by the sampling procedure according to the multipath characteristic measurement signal. Can be configured to estimate.
  • the multinos characteristics estimation method of the present invention has an abbreviation for the time length of each chip, receives an N-chip multipath characteristics measurement signal, and The multi-path characteristic estimation method for estimating the multi-path characteristics, and oversampling procedure for sampling M (M is a natural number of 2 or more) times for each chip of the received multi-path characteristic measurement signal.
  • M is a natural number of 2 or more
  • the sampling procedure that thins out the signal obtained by the oversampling procedure to 1ZM and the M signals obtained by the sampling procedure.
  • the multipath characteristic estimation method of the present invention can be configured such that the dispersive filter processing is matched filter processing or ZCZ filter processing.
  • the multinos characteristic estimation method of the present invention has a time length of each chip of about ⁇ , and a multipath characteristic measurement signal S (S, S ⁇ S)
  • a filter processing procedure to be processed by the matched filter and can be configured to estimate the multinos characteristic of the line based on the signal obtained by the discrete filter procedure!
  • the multipath characteristic estimation method of the present invention can be configured such that the multipath characteristic measurement signal is a pseudo-periodic signal.
  • the multinos characteristic estimation apparatus of the present invention receives an N-chip multipath characteristic measurement signal whose time length of each chip is abbreviated,
  • the multipath characteristic estimation device for estimating the multipath characteristic has an oversampling means for sampling M (M is a natural number of 2 or more) times for each chip of the received multipath characteristic measurement signal.
  • the multinos characteristic can be estimated.
  • the multinos characteristic estimation apparatus of the present invention receives an N-chip multipath characteristic measurement signal whose time length of each chip is abbreviated,
  • the multipath characteristic estimation device for estimating the multipath characteristic shifts the received multipath characteristic measurement signal and samples N times in M (M is a natural number of 2 or more) different periods.
  • Multipath characteristics of the line are obtained by performing Nth-order discrete filter processing according to the multipath characteristic measurement signal for each of the sampling means and the M signals obtained by the sampling means. Can be configured to estimate.
  • the multi-nos characteristic estimation apparatus of the present invention receives an N-chip multi-path characteristic measurement signal whose time length of each chip is abbreviated, and In a multipath characteristic estimation device that estimates multipath characteristics,
  • M is 2 or more natural Multi-path characteristic measurement for each of the oversampling means that samples a number of times, the sampling means that thins out the signal obtained by the oversampling means to 1ZM, and the M signals obtained by the sampling means It can be configured to estimate the multipath characteristics of a line by performing Nth-order discrete filter processing according to the signal used.
  • the multipath characteristic estimation apparatus of the present invention can be configured such that the dispersive filter processing is matched filter processing or ZCZ filter processing.
  • the multi-nos characteristic estimation apparatus of the present invention uses an N-chip multi-path characteristic measurement signal S (S, S... S) with a chip frequency of 1Z.
  • the received multipath characteristics measurement signal is frequency M times the chip frequency (M is a natural number of 2 or more).
  • M is a natural number of 2 or more.
  • Filter processing means for processing by the matched filter, and can be configured to estimate the multi-nos characteristics of the line based on the signal obtained by the discrete filter means.
  • the multipath characteristic estimation apparatus of the present invention can be configured such that the multipath characteristic measurement signal is a pseudo-periodic signal.
  • the received signal correction method of the present invention is a received signal correction method in which a known pilot signal of a chip is received and the received signal is corrected. Oversampling procedure that samples ⁇ ( ⁇ is a natural number of 2 or more) times and oversampling procedure. Based on NM pilot signals! /, And a correction coefficient generation procedure for generating NM correction coefficients. Based on the correction coefficients generated in the correction coefficient generation procedure, the received signal is It can be configured to correct.
  • the receiving method of the present invention is based on the estimated multipath characteristics of the line in advance from the received signal of the chip whose time length of each chip is approximately ⁇ .
  • An equation generation procedure for generating a set of simultaneous equations on the basis of the multipath characteristics corresponding to each chip of the received signal;
  • the multipath characteristic power of the line is estimated by a signal oversampling procedure for estimating the next characteristic and a multipath characteristic estimating procedure,
  • ⁇ The multipath characteristic estimation signal of the chip is received, and for each chip of the received multinos characteristic estimation signal, ⁇ ( ⁇ is a natural number of 2 or more) Signal oversampling procedure for characteristic estimation with multiple sampling
  • the equation generation procedure generates ⁇ simultaneous equations based on the received signal oversampled by the received signal oversampling procedure and the multipath characteristics estimated by the multipath characteristic estimation procedure, and the simultaneous equations
  • the solution procedure can be configured to solve the simultaneous equations generated in the equation generation procedure.
  • the receiving method of the present invention estimates the received signal power of the chip and the transmitted signal of the chip based on the multipath characteristics estimated in advance.
  • the multipath characteristics of the line are estimated by the following signal oversampling procedure for characteristic estimation and the multipath characteristic estimation procedure.
  • ⁇ The multipath characteristic estimation signal of the chip is received, and for each chip of the received multinos characteristic estimation signal, ⁇ ( ⁇ is a natural number of 2 or more) Signal oversampling procedure for characteristic estimation with multiple sampling 'Multipath characteristics estimation procedure for estimating the multipath characteristics of a line by filtering the multipath characteristics estimation signal oversampled by the characteristics estimation signal oversampling procedure using the discrete filter procedure
  • a signal that has passed through the multipath characteristic line is estimated, and the estimated received signal is stored in the estimated received signal storage means.
  • the cross-correlation received signal stored in the estimated received signal storage means is compared by the least square method, and the estimated received signal with the least error as a result of the comparison is estimated as the transmitted signal.
  • the discrete filter procedure in the reception method of the present invention can be configured to be a matched filter processing procedure or a ZCZ filter processing procedure.
  • the received signal correction apparatus of the present invention receives an N-chip known pilot signal and corrects the received signal. Based on the oversampling means that samples M (M is a natural number of 2 or more) times for each chip of the pilot signal, and NM pilot signals oversampled by the oversampling means! Correction coefficient generating means for generating NM correction coefficients,
  • the received signal can be corrected.
  • the receiving device of the present invention is based on the estimated multipath characteristics of the line in advance from the received signal of the chip whose time length is approximately ⁇ .
  • an equation generating means for generating a number of simultaneous equations based on the multipath characteristics corresponding to each chip of the received signal, and an equation generating means
  • the system can be configured to have simultaneous equation solving means for solving the generated simultaneous equations.
  • the receiving apparatus of the present invention performs reception signal oversampling that samples ⁇ ⁇ ⁇ ( ⁇ is a natural number of 2 or more) times for each chip of the reception signal. Having means,
  • the multipath characteristics of the line are estimated by the following characteristic estimation signal oversampling means and multipath characteristic estimation means,
  • N-chip multipath characteristic estimation signal is received, and for each chip of the received multinos characteristic estimation signal, M (M is a natural number of 2 or more)
  • M is a natural number of 2 or more
  • Multipath characteristic estimation means for estimating the multipath characteristic of the line by filtering the multipath characteristic estimation signal oversampled by the characteristic estimation signal oversampling procedure with a discrete filter means
  • the equation generating means generates NM simultaneous equations based on the received signal oversampled by the received signal oversampling means and the multi-nos characteristic estimated by the multipath characteristic estimating means, and the simultaneous equations
  • the solving means can be configured to solve NM simultaneous equations generated by the equation generating means.
  • the discrete filter means in the receiving apparatus of the present invention can be configured to be a matched filter processing means or a ZCZ filter processing means.
  • a multipath characteristic estimation method and apparatus a reception method, and a received signal correction method and apparatus capable of estimating multipath characteristics with high accuracy without using a broadband pilot signal. Can do.
  • FIG. 1 is a diagram for explaining a matched filter.
  • FIG. 2 is a diagram (part 1) for explaining oversampling.
  • FIG. 3 is a diagram for explaining a multipath characteristic estimation apparatus (1).
  • FIG. 4 is a diagram for explaining a multipath characteristic estimation apparatus (part 2).
  • FIG. 5 is a diagram for explaining an output of a matched filter.
  • FIG. 6 is a diagram for explaining a multipath characteristic estimation apparatus (part 3).
  • FIG. 7 is a diagram for explaining a multipath characteristic estimation apparatus (part 4).
  • FIG. 8 is a diagram for explaining correction in OFDM.
  • FIG. 9 is a diagram for explaining a case where a guard inverter is provided in front.
  • FIG. 10 is a diagram for explaining the case where guard inverters are provided at the front and rear.
  • FIG. Ll is a diagram for explaining generation of a signal correction coefficient in OFDM.
  • FIG. 12 is a diagram (part 2) for explaining oversampling.
  • FIG. 13 is a diagram for explaining signal correction in OFDM.
  • FIG. 14 is a diagram for explaining received signal determination (part 1).
  • FIG. 15 is a diagram for explaining received signal determination (part 2).
  • FIG. 16 is a diagram for explaining generation of simultaneous equations based on received signals.
  • FIG. 17 is a flowchart for explaining a received signal correction processing method.
  • FIG. 18 is a diagram (part 1) for explaining the principle of oversampling in the RF band.
  • FIG. 19 is a diagram (part 2) for explaining oversampling in the RF band.
  • FIG. 20 is a diagram (part 3) for explaining oversampling in the RF band.
  • Reference numerals 12, 22, 32, and 42 denote pilot signal receivers.
  • Reference numerals 13, 23, 33, and 43 denote oversampling units.
  • Reference numeral 52 denotes an SZP conversion unit.
  • [0036] 53 is an IDFT.
  • Reference numeral 54 denotes a pseudo-cycle imparting unit.
  • Reference numeral 55 denotes a modulation unit.
  • Reference numeral 62 denotes a demodulation unit.
  • [0041] 64 is a pseudo-period removing unit.
  • [0042] 65 is a signal correction unit.
  • [0043] 66 is a DFT.
  • Reference numeral 67 denotes a PZS conversion unit.
  • Reference numerals 72 and 76 denote determination circuits.
  • [0046] 74 is an error correction circuit.
  • the pilot signal is a known signal on the receiving side, and the pilot signal includes a phase / amplitude correction pilot signal for correcting the phase and Z or magnitude of the received signal, and a multipath characteristic. There is an estimation pilot signal.
  • phase / amplitude correction pilot signal is transmitted prior to the data to be transmitted, and based on the phase / amplitude correction pilot signal received on the receiving side, the correction coefficient for correcting the received signal Create
  • the pilot signal for estimating the multipath characteristic is a signal different from the data signal, and at least a signal that is distinguished from the data signal.
  • the pilot signal a signal having a low cross-correlation with a data signal having a high autocorrelation is used.
  • the receiving side estimates the multipath characteristics by comparing the pilot signal that should be received with the pilot signal that is actually received. This comes out.
  • the pilot signal is transmitted on the transmission side in the following manner.
  • phase / amplitude correction pilot signal may be used as the phase / amplitude correction pilot signal and the multipath characteristic estimation pilot signal.
  • the pilot signal is assumed to be P (1, -1, 1, 1) and will be described with reference to FIG.
  • This signal From P (l, -1, 1, 1) add a signal of 1Z4 length in the second half of this signal before signal P, and add a signal of 1Z4 length in the first half of this signal after signal P.
  • the pseudo-periodic signal A (l, 1, -1, 1, 1, 1) is generated. A specific method for generating pseudo-periodic signals will be described later.
  • the oversampled signal is (# 1 of "1", # 2 of “1", # 3 of "1", # 4 of "1", # 1, "1", # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1, # 1 4, “1” # 1, “1” # 2, “1” # 3, “1” # 4).
  • the signal Q (l, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1) is obtained.
  • the oversampling cycle need not be the same.
  • the time length of each chip is approximately ⁇ , and each chip is sampled ⁇ ( ⁇ is a natural number of 2 or more) times ( ⁇ oversampling) for the multipath characteristics measurement signal of ⁇ chip. May be. (Multipath measurement (part 1))
  • the measurement of multipath characteristics will be explained using Fig. 3.
  • the multipath characteristic pilot signal is received by the antenna 11 and received by the pilot signal receiver 12.
  • the pilot signal receiver 12 transforms the radio frequency domain signal into an intermediate frequency or baseband signal. To do.
  • the output of the pilot signal receiving unit 12 is the pseudo-periodic signal A (l, 1, -1, 1, 1, 1) of the pilot signal P (l, -1, 1, 1) Will be described.
  • the oversampling unit 13 generates a pseudo-periodic signal A (l, 1, -1, 1, 1, 1).
  • a pseudo-periodic signal A (l, 1, -1, 1, 1, 1).
  • This signal C is connected to signal B (l, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1), as shown in the figure, the peak signal D based on the direct wave (value 4) and 3 After / 4, the peak signal R (its value 4a) based on the reflected wave can be obtained.
  • the measurement of multipath characteristics will be explained using Fig. 4.
  • the multipath characteristic pilot signal is received by the antenna 21 and received by the pilot signal receiver 22.
  • the no-lot signal receiving unit 22 transforms the radio frequency domain signal into an intermediate frequency or baseband signal.
  • pilot signal receiving unit 22 is pseudo-periodic signal A (l, 1, -1, 1, 1, 1) of pilot signal P (l, -1, 1, 1). Will be described.
  • the signals D (1) to D (4) are converted into the signal E (l, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0).
  • the four output signals, F (l) to F (4), when the matched filter is input are shown below.
  • F (3) (0, 0, 1, 0, 0, 0, 2 + a, 0, 0,-l + 2a, 0, 0, 0, — a, 0, 0, 0, 4, (0, 0, 0, 4a, 0, 0, 0, 1, 0, 0, 0, a, 0, 0, 0, 1, 0, 0, 0, a)
  • the four output signals F (1) force are also F (4), and the output near the peak value is shown in Fig. 5 (A).
  • the signal F (1) force is also F (4), the received signal is estimated by (estimated received signal) described later. This gives the direct wave in Fig. 5 (B). Also, if the direct wave is found, the reflected wave is also found, and as shown in Fig. 5 (B), it can be seen that there is a reflected wave of amplitude a that is 3 ⁇ / 4 shifted from the direct wave. .
  • the measurement of multipath characteristics will be explained using Fig. 6.
  • the multipath characteristic pilot signal is received by the antenna 31 and received by the pilot signal receiving unit 32.
  • the no-lot signal receiving unit 32 transforms the radio frequency domain signal into an intermediate frequency or baseband signal.
  • pilot signal receiving unit 32 is pseudo-periodic signal A (l, 1, -1, 1, 1, 1) of pilot signal P (l, -1, 1, 1) Will be described.
  • the oversampling unit 33 oversamples the pseudo-periodic signal A (l, 1, -1, 1, 1, 1) at the sampling frequency 4Z ⁇ , the following signal ⁇ is obtained.
  • the output signal C of oversampling in some cases is as follows.
  • the following shows four signals G (l) to G (4) sampled by shifting ⁇ ⁇ ⁇ ⁇ 4 at a chip frequency (1Z ⁇ ) with respect to signal C.
  • the signals other than the sampling time are used. No issue point is output.
  • the signals G (1) to G (4) are converted from the four output signals H (l) to H (4) when the signal E (l, -1, 1, 1) matched filter is input. Shown below.
  • the multipath characteristic estimation apparatus of FIG. 7 includes an antenna 41, a pilot signal receiver 42, an oversampling unit (sampling at a sampling frequency 4Z ⁇ ) 43 and
  • the matched filter 44 is provided.
  • the pseudo-periodic signal A (l, 1, -1, 1, 1, 1) generated from the pilot signal (1, -1, 1, 1) is received by the antenna 41, and the pilot signal receiving unit Receive at 42. Furthermore, when the oversampling unit 43 oversamples the quasi-periodic signal A (l, 1, -1, 1, 1, 1) at the sampling frequency 4 ⁇ , the following signal ⁇ is obtained.
  • the output signal C of oversampling in some cases is as follows.
  • the multipath characteristics were measured using the matched filter.
  • the present invention is not limited to the matched filter.
  • a discrete filter that can obtain a large pulsed filter output with respect to the pie-pit signal is acceptable.
  • a ZCZ filter may be used.
  • (Signal correction in OFDM) 08 is an OFDM transmitter 50, which comprises an SZP (serial Z parallel) converter 52, an IDFT (Inverse Discrete Fourier Transform) 53, a pseudo period imparting unit 54, a modulator 55, an oscillator 57, and an antenna 56. It has been.
  • SZP serial Z parallel
  • IDFT Inverse Discrete Fourier Transform
  • Transmission data (for example, a digital information sequence) is converted into a parallel signal by an S / P (serial Z parallel) converter 52.
  • the signal converted to the parallel signal is subjected to inverse DFT by IDFT53. This corresponds to each signal converted into an amplitude force parallel signal of a plurality of individual frequencies in an orthogonal relationship (this frequency is referred to as “subcarrier”).
  • subcarrier this frequency is referred to as “subcarrier”.
  • the pseudo period giving unit 54 inserts a guard interval (cyclic pre (post) status) GI.
  • a guard interval cyclic pre (post) status
  • GI guard interval
  • this is equivalent to copying a part of the latter half of the effective symbol ST and adding it before the effective symbol.
  • the OFDM signal in which the guard interval GI is inserted is radiated from the antenna 56 after the modulation unit 55 modulates the carrier wave (carrier) output from the oscillator 57.
  • mapping unit may be provided between the SZP conversion unit 52 and the IDFT 53, and mapping may be performed on the complex plane by QAM or the like.
  • the OFDM receiver 60 in FIG. 8B includes an antenna 61, a demodulator 62, and an oscillator 6.
  • Receiving device 60 in FIG. 8B performs the reverse process of the transmitting device.
  • the demodulator 62 demodulates the output of the oscillator 63 of the oscillator 63.
  • the pseudo-period remover 64 removes the guard interval.
  • the synchronization detection / signal correction unit 65 uses the received reference code to detect the synchronization signal. Correct outgoing and received signals.
  • the transmission-controlled OFDM signal is subjected to DFT calculation by DFT66, and further, the PZS conversion unit 67 performs parallel Z-serial conversion to output received data.
  • IEEE802.11a has 52 subcarriers. Four of these subcarriers are used for phase rotation correction, and the other 48 subcarriers are used for data transmission.
  • known signals (a, a,..., A) are transmitted to subcarriers 0 to 47 where data is transmitted.
  • Signals (a, a, ..., &) are received by the receiver and oversampled.
  • oversampling # M signal is a and oversampling for signal a #
  • oversampling signal # 2 is a
  • a is a signal a
  • Oversampling # 1 signal is a and oversampling # 2
  • the 1S reception output means that the channel exists virtually every oversampling.
  • the correction factor for the oversampling # 1 channel of signal a is to compensate the received signal a for a.
  • the correction factor for the oversampling # 1 channel of signal a is a / a
  • the correction factor for the oversampling # 1 channel of signal a is a / a.
  • the correction factor for the oversampling # 2 channel of signal a is a / a
  • the correction factor of the oversampling # 2 channel of signal a is a / ⁇ , and the correction factor of the oversampling # 2 channel of signal a is a / a.
  • the oversampling of signal a # M has a correction factor of a / a
  • the oversampling #M correction factor for signal a is a / a
  • the oversampling #M correction factor for signal a is a / a
  • This transmission data (b, b, ..., b) is received and the received signal is oversampled.
  • the received signal is corrected by multiplying the received signal by the correction coefficient obtained as described above.
  • the correction factor of the oversampling # 1 channel of signal a is a / a
  • the received b is multiplied by a / a and corrected.
  • the received b- is corrected by multiplying by a and a.
  • Received b is multiplied by a a and corrected.
  • the corrected b is multiplied by a to correct it.
  • the received b is corrected by multiplying by a / a.
  • Received b is multiplied by a a and corrected.
  • the received b is a, 'a
  • the received b is corrected by multiplying by a / a.
  • the received b is corrected by multiplying by a / a.
  • ⁇ x> represents X corrected as described above (correction by the correction coefficient).
  • ku x represents the determined result force.
  • the signals ⁇ b ⁇ , b b ⁇ , ⁇ b ⁇ are the signals b ⁇ b ⁇ b force This is a corrected signal.
  • Signals b>, b>, and b> are supplemented by signals b, b, b.
  • signals b>, b>, and b> are signals b, b, b
  • signals ⁇ b>, ⁇ b>, ⁇ b> are signals related to the transmission signal b
  • the following logic is used as the determination logic of the determination circuits 72-1 to 72-47.
  • Proportion of incorrect correction signal P is set to 0.1
  • Corrected signal is positive and the percentage of signals (1 P) is 0.9.
  • the error rate of this determination circuit is 0.1.
  • the correct rate for (B) is 0.23 for 3 X (1—P) 2 XP
  • the correct rate for (C) is 3 X (1— P) XP 2 (D0. 027
  • FIG. 15 shows a case where the transmission signal (b, b,---. B) is an error correction code. Error correction times
  • the error correction circuit 74-2 performs the processing for the received transmission signals (b, b, ..., b).
  • Error correction is performed based on the number.
  • the error correction circuit 74—M provides a code for the received transmission signal (b, b,..., B).
  • Error correction is performed based on the signal.
  • the signal corrected by the error correction circuit 72-1 to error correction circuit 72-47 is determined by the determination circuit 76 in the same manner as in FIG. ⁇ , ...
  • error correction is performed on signals with the same oversampling #. Error correction may be performed on signals with different oversampling #s.
  • a method for estimating a signal received via a transmission path having a multipath will be described. There are two methods of estimation: a method of solving simultaneous equations and a method of least squares. [0131] First, estimation of a received signal by solving simultaneous equations will be described.
  • This example explains how to estimate the received signal to be received when there is no multipath.
  • 0 1 2 63 is represented by the sum of a direct wave (FIG. 16 (a)) and a multipath wave (FIG. 16 (b) and FIG. 16 (c)).
  • the received signal (b, b, b,..., B) can be estimated.
  • the received signal to be received can also be referred to as a transmitted signal. Therefore, estimating the received signal to be received is performed by estimating the transmitted signal. There is.
  • a received signal via a multipath characteristic line is estimated, and the estimated received signal is stored in estimated received signal storage means.
  • the received signal actually received and the estimated received signal stored in the estimated received signal storage means are compared by the least square method. As a result of the comparison, the estimated received signal with the least error is obtained. Estimated as a transmission signal.
  • the simultaneous equations are similarly solved to oversample the 6 received signals (b, b, b,. ⁇ ⁇ ⁇ B) can be estimated.
  • Multipath characteristic power If estimated by oversampling M times, oversampling M times is also performed for 64 received signals (b, b, b, ..., b).
  • 64 X M simultaneous equations are generated in the same manner as in (estimation of received signal).
  • 64 X M received signals (b, b, b,..., B) oversampled can be estimated.
  • the received signal correction method will be described with reference to FIG.
  • a pilot signal is received (S10), and then the received pilot signal is oversampled (Sl l). Since the no-lot signal is known, a correction coefficient is generated based on the actually received value and the value to be received (S12). The generated correction coefficient is stored (S13).
  • FIG. 18 is a principle diagram of oversampling in the RF band.
  • Figure 18 shows two sinusoidal waveforms. One is an original carrier (carrier), which is indicated by y. The other is a received carrier wave that is affected by the characteristics of the line. y
  • sampling is performed at time 0 with respect to the received carrier y and at time ⁇ + ⁇ 2.
  • phase difference between the received carrier y and the original carrier y is ⁇ and received.
  • A can be obtained for the amplitude of carrier wave y.
  • FIG. 19 is a diagram in the case of signal (1, 1, 1, ⁇ 1) force balanced modulation (BM modulation is also binary phase modulation).
  • FIG. 18A shows the signal (1, 1, 1, ⁇ 1)
  • FIG. 18B shows the modulated wave.
  • the received carrier y is calculated from the first four sample points of “1”.
  • phase difference of 2 1 is 0, “ ⁇ ”, “ ⁇ ”, “ ⁇ ”, and “ ⁇ ” are output.
  • in-phase component output (I) and quadrature component output (Q) are obtained as outputs (D) and ( ⁇ ) in FIG.
  • d and d are signals, and the case of “1” or “1” is QPSK.
  • the Q-phase output was zero. This is the case where the receiver knows the original carrier and knows the original carrier.
  • sampling is performed at time t, 90 ° after time t. Real part value at that time
  • the I-phase signal is “rcos ⁇ ”
  • the Q-phase signal is “—rcos ⁇ ”.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

La présente invention concerne un procédé d'estimation de caractéristique pluri-chemin destiné à estimer la caractéristique pluri-chemin d'une ligne en recevant un signal de mesure de caractéristique pluri-chemin de N puces, la durée de chaque puce étant τ. Le procédé comprend une étape de sur-échantillonnage qui effectue l'échantillonnage M fois (M étant un nombre naturel supérieur ou égal à 2) pour chaque puce du signal de mesure de caractéristique pluri-chemin reçu et une étape de filtrage discret qui effectue un processus de filtrage discret par filtre de degré NM. Le signal de mesure pluri-chemin sur-échantillonné de l'étape de sur-échantillonnage est soumis au processus de filtrage par l'étape de filtrage discret, estimant ainsi la caractéristique pluri-chemin de la ligne.
PCT/JP2007/060926 2006-06-01 2007-05-29 Procédé et dispositif d'estimation de caractéristique pluri-chemin, procédé de réception, procédé de correction du signal de réception et dispositif WO2007139119A1 (fr)

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JP2008517949A JP5261173B2 (ja) 2006-06-01 2007-05-29 マルチパス特性推定方法及び装置、受信方法並びに受信信号補正方法及び装置

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JP2006-181372 2006-06-30
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US8213559B2 (en) 2007-06-28 2012-07-03 Naoki Suehiro Parallel sampling device, parallel sampling method, receiving device, and receiving method
WO2019094720A1 (fr) * 2017-11-13 2019-05-16 Nanosemi, Inc. Égaliseur non linéaire dans des dispositifs récepteurs de communication

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Publication number Priority date Publication date Assignee Title
US8213559B2 (en) 2007-06-28 2012-07-03 Naoki Suehiro Parallel sampling device, parallel sampling method, receiving device, and receiving method
WO2019094720A1 (fr) * 2017-11-13 2019-05-16 Nanosemi, Inc. Égaliseur non linéaire dans des dispositifs récepteurs de communication
US11258639B2 (en) 2017-11-13 2022-02-22 Nanosemi, Inc. Non-linear equalizer in communication receiver devices

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JPWO2007139119A1 (ja) 2009-10-08

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