WO2008029704A1 - Dispositif de transmission, dispositif de réception, système de communication, et procédé de communication - Google Patents

Dispositif de transmission, dispositif de réception, système de communication, et procédé de communication Download PDF

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Publication number
WO2008029704A1
WO2008029704A1 PCT/JP2007/066889 JP2007066889W WO2008029704A1 WO 2008029704 A1 WO2008029704 A1 WO 2008029704A1 JP 2007066889 W JP2007066889 W JP 2007066889W WO 2008029704 A1 WO2008029704 A1 WO 2008029704A1
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Prior art keywords
spreading
unit
code
signal
chips
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PCT/JP2007/066889
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English (en)
Japanese (ja)
Inventor
Ryota Yamada
Takashi Yoshimoto
Minoru Kubota
Takashi Onodera
Toshizo Nogami
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Sharp Kabushiki Kaisha
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Publication of WO2008029704A1 publication Critical patent/WO2008029704A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems

Definitions

  • the present invention relates to a transmission device, a reception device, a communication system, and a communication method, and more particularly to a transmission device, a reception device, a communication system, and a communication method that perform communication using a signal that has been spread using a spreading code and then interleaved.
  • MC-CDMA Multi-Carrier Code Division Multiple Access
  • OFCDM Orthogonal Frequency and Code Division Multiplexing
  • information symbols are repeated on continuous subcarriers corresponding to the spreading factor ( Copy) and multiply the repeated subcarriers by the spreading code (hereinafter referred to as frequency axis spreading). Since the subcarrier symbols are frequency-axis spread with separable spreading codes, code multiplexing can be performed.
  • demodulation is performed by extracting the desired information symbol by despreading using a spreading code in which the desired information symbol is spread, and restoring the information transmitted on each subcarrier. .
  • Non-Patent Document 1 The MC-CDMA system and OFCDM system that operate as described above are described in Non-Patent Document 1, for example. MC-CDMA and OFCDM receivers need to maintain good orthogonality between spreading code sequences in order to obtain information symbols accurately from code-multiplexed signals. .
  • interleaving for rearranging signals in the time direction or frequency direction is usually performed on the transmission side, and the original is performed on the reception side. Perform a Dinter Leave to return.
  • This interleaving / dinterleaving includes, for example, chip interleaving that rearranges in the frequency direction in units of chips, and symbol interleaving that rearranges in the frequency direction in units of symbols before spreading. In these interleavings, frequency selective features with large frequency fluctuations are used.
  • Non-Patent Document 1 Maeda, Shin, Abeda, Sawahashi, "VSF using OFD-OFCDM and its characteristics", IEICE Technical Report RCS2002-61, May 2002
  • Non-Patent Document 2 Maeda, H. Atarashi, M. sawahashi, Performance Comparison of Channel Interleaving Methods in Frequency Domain for VSF-OFCDM Broadband Wireless Access in Forward Link, IEICE trans, commun., Vol. E86-B, No. 1, Jan. 200 3
  • Fig. 7 multiplexes 3 code channels via a propagation path in an ideal frequency-selective fading environment with no frequency fluctuation on the coordinate plane with the horizontal axis representing frequency and the vertical axis representing received power.
  • the received power frequency characteristics of the received signal are illustrated.
  • the received signal indicates 8 chips on the frequency axis. These 8 chips are obtained by spreading one symbol.
  • the signals received in the environment shown in the upper part of Fig. 7 are spread codes C and C, respectively.
  • Figure 8 shows the received signal described in Figure 7 multiplied by the spreading code C to perform inverse expansion.
  • ⁇ represents transposition of a matrix.
  • FIG. 9 shows an example of a received signal when frequency fluctuation occurs in the spreading code.
  • the upper part of Fig. 9 shows the received signal that has passed through the propagation path in a frequency selective fading environment with frequency fluctuations in the spread code on the coordinate plane with the horizontal axis representing frequency and the vertical axis representing received power.
  • the received power frequency characteristics are illustrated.
  • the received signal indicates 8 chips on the frequency axis for convenience of explanation. These 8 chips are chips obtained by spreading one symbol.
  • the received signals for four chips with low frequency are hardly affected by the propagation path, as in the case of Fig. 7 above, but the received signals for four chips with high frequency are The received power is extremely reduced due to the strong attenuation caused by. Therefore, as shown in the lower part of Fig. 9, the signal with the symbol "1" spread by spreading codes C, C, C
  • Inter-code interference MCI has occurred.
  • FIG. 10 is a diagram for explaining the symbol interleaver.
  • the upper part of Fig. 10 shows the case where a symbol interleaver is used, and the signal passes through a propagation path in a frequency-selective fading environment with frequency fluctuations in the coordinate plane with the horizontal axis representing frequency and the vertical axis representing received power.
  • the received power frequency characteristics of the received signal are shown for the Dinterleave operation on the receiving side.
  • the received signal shows 16 chips equivalent to 2 symbols on the frequency axis. Since the symbol interleaver performs rearrangement for each symbol, the eight received chips that remain adjacent on the frequency axis before and after the rearrangement receive almost the same received power with almost no influence of frequency fluctuations. It becomes.
  • Symbol 1 (8 chips on the lower frequency side in 16 chips) and Symbol 2 (8 chips on the higher frequency side in 16 chips) are placed in different frequency regions due to symbol interleaving. Among these, the received power tends to be different due to the influence of frequency fluctuation.
  • each chip of symbol 1 can obtain sufficient received power, whereas each chip of symbol 2 is sufficiently attenuated to obtain sufficient received power. Not happen.
  • C [1-1-1 1 1-1-1 1]
  • Each of the received signals is the spreading code C C itself. Like this 2
  • the received signals of 8 and 7 are “0 0 0 0 0 0 0 0 0” and “0 0 0 0 0 0 0 0”, respectively.
  • FIG. 11 is a diagram illustrating a chip interleaver.
  • the upper part of Fig. 11 shows the propagation path in a frequency-selective fading environment with frequency fluctuations in the coordinate plane with the horizontal axis representing frequency and the vertical axis representing received power when a chip interleaver is used.
  • This figure shows the received power frequency characteristics of the received signal that passed through, for the Dinterleave operation on the receiving side.
  • the received signal shows 16 chips equivalent to 2 symbols on the frequency axis. Since the chip interleaver performs rearrangement for each chip, it is placed in a different frequency region for each chip due to rearrangement. Therefore, the received power varies from chip to chip under the influence of frequency fluctuations. Cheap.
  • the first, second, fourth, fifth and eighth chips of symbol 1, and the second, third and sixth chips of symbol 2 Provides sufficient received power, and the third, sixth, and seventh chips of symbol 1 and the first, fourth, fifth, seventh, and eighth chips of symbol 2 are strongly attenuated.
  • the received signals are “1 1 0 1 1 0 0 1” and “1 1 0 1 1 0 0 1”, respectively. Multiplying the received signal including these two signals by spreading code C
  • the present invention can obtain a symbol with high accuracy on the receiving side from a code-multiplexed signal while obtaining a frequency diversity effect by using code multiplexing by spreading code and interleaving in units of chips. It is an object to provide a transmission device, a reception device, a communication system, and a communication method.
  • the present invention has been made to solve the above-described problem, and the transmission apparatus of the present invention spreads transmission symbols using a spreading code to generate a chip for each code channel.
  • a group consisting of a code multiplexing unit that multiplexes the chips of a plurality of channels and generates a multiplexed signal, and a group of the multiplexed signals adjacent to each other in the spreading direction with a smaller number of chips than the spreading rate of the spreading code.
  • an interleaver for rearranging the order of the spreading direction of the multiplexed signal.
  • the transmitting apparatus of the present invention transmits a signal capable of accurately obtaining a symbol on the receiving side from a code-multiplexed signal while obtaining a frequency diversity effect by using an appropriate spreading code and group. it can.
  • the multiplexed signal can be separated by a spreading code corresponding to the group among the spreading codes.
  • the portion between the spreading codes corresponding to the group is orthogonal or quasi-orthogonal.
  • the transmitting apparatus of the present invention can transmit a signal that can accurately acquire symbols on the receiving side from a code-multiplexed signal while obtaining a frequency diversity effect.
  • the group is preferably within a unit of spreading processing by the spreading unit! /.
  • the number of chips constituting each group is the same.
  • the receiving apparatus of the present invention receives a group of signals composed of signals adjacent to each other in the spreading direction of the spreading process having a smaller number of chips than the spreading rate of the spreading code used for the spreading process at the time of transmission.
  • the spreading code by multiplying the spreading code by the Dinterleaver section that performs Dinterleaving by rearranging the order of the spreading direction of the signal and the received signal that is Dinterleaved by the Dinterleaver section.
  • a despreading unit for separating and extracting symbols.
  • the receiving apparatus of the present invention can obtain a symphony with high accuracy from a code-multiplexed signal while obtaining a frequency diversity effect by using an appropriate spreading code and group.
  • the correlation between the spreading codes of the part corresponding to the group is orthogonal or quasi-orthogonal.
  • the receiving apparatus of the present invention can acquire a symbol with high accuracy from a code-multiplexed signal while obtaining a frequency diversity effect.
  • the group is within the unit of the spreading process.
  • the number of chips constituting each group is the same.
  • the communication system of the present invention is a communication system including a transmission device and a reception device, wherein the transmission device spreads transmission symbols using a spreading code and generates a chip for each code channel.
  • Multiplexer and multiple channels chip are multiplexed and multiplexed
  • the order of the spreading direction of the multiplexed signal is rearranged in units of groups of the code multiplexing unit that generates the multiplexed signal and the multiplexed signal adjacent in the spreading direction with a smaller number of chips than the spreading rate of the spreading code.
  • An interleaver unit, and the reception apparatus rearranges the order of the spreading direction of the received signal in units of the group so that the rearrangement by the interleaver unit is restored.
  • a despreading unit that separates and extracts symbols corresponding to the spreading code by multiplying the received signal that has been deinterleaved by the dingerleaver unit by the spreading code.
  • the communication method of the present invention is a communication method in a communication system composed of a transmission device and a reception device, wherein the transmission device spreads transmission symbols using a spreading code for each channel to generate a chip.
  • the first process the second process in which the transmitter multiplexes the chips of the plurality of channels generated in the first process and generates a multiplexed signal, and the transmitter in the spreading direction.
  • a received signal that has been deinterleaved in the fourth step by the receiver and a fourth step in which the receiver is rearranged so that the rearrangement in the third step is restored.
  • the by multiplying the spreading code comprises a fifth step of extracting separation symbols channel corresponding to the spreading code.
  • FIG. 1 is a schematic block diagram showing a configuration of a transmission device according to a first embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of interleaving by grouping a plurality of chips by an interleaver unit 7 according to the first embodiment.
  • 3 This is a diagram showing an example of a received signal when there is a frequency variation when the interleaver grouped by the interleaver unit 7 is used.
  • FIG. 5 A schematic block diagram showing the configuration of the receiving device according to the second embodiment.
  • FIG. 6 is a schematic block diagram showing a configuration of an MCI replica generation unit 27 in the same embodiment.
  • FIG. 6 is a diagram showing an example of a received signal when frequency axis spreading and code multiplexing are performed. 8]
  • FIG. 8 is a diagram showing a despreading process for the received signal example shown in FIG.
  • FIG. 9 It is a diagram showing a despreading process for an example of a received signal that has undergone frequency fluctuation.
  • Fig. 10 is a diagram showing an example of the received signal when there is a frequency fluctuation when the symbol interleaver is used.
  • the power to be described in the case of MC-CDMA system using frequency axis spreading for multi-carrier transmission! / Is applied to the present invention is limited to frequency axis spreading. It can be used even in the case of spreading in the time axis, or in the case of spreading in two dimensions, the frequency axis and the time axis. Further, the present invention can be used even in the case of single carrier transmission, which is not limited to application to multicarrier transmission.
  • FIG. 1 is a schematic block diagram showing the configuration of the transmission apparatus according to the first embodiment.
  • the transmitter is a code channel signal generator 1;! ⁇ 1 Cn, code multiplexer 6, interleaver 7, IFFT (Inverse Fast Fourier Transformation) 8, parallel / serial converter 9, pilot It consists of a multiplexing unit 10, a GI (Guard Interval) insertion unit 11, a D / A conversion unit 42, a transmission filter unit 12, a radio unit 43, and a transmission antenna unit 14.
  • GI Guard Interval
  • Cn is the number of multiplexed codes.
  • the code channel signal generation unit 1 1 to 1 Cn includes an error correction coding unit 2 that performs error correction coding such as a turbo code and a convolutional code on information bits, and QPSK ( Quadrature Phase Shift Keying), 16Q AM (Quadrature Amplitude Modulation), etc. It consists of a spreading unit 5 that generates chips by multiplying and spreading spreading code sequences.
  • error correction coding such as a turbo code and a convolutional code on information bits, and QPSK ( Quadrature Phase Shift Keying), 16Q AM (Quadrature Amplitude Modulation), etc.
  • QPSK Quadrature Phase Shift Keying
  • 16Q AM Quadadrature Amplitude Modulation
  • the code multiplexing unit 6 multiplexes signals output from the code channel signal generation units 11 to 1 Cn to generate a multiplexed signal.
  • the interleaver unit 7 rearranges the multiplexed signals in the frequency direction while suppressing inter-code interference (MCI) and performs chip interleaving.
  • the IFFT unit 8 performs frequency time conversion on the chip interleaved signal.
  • the parallel / serial converter 9 performs parallel / serial conversion on the frequency-time converted signal.
  • the pilot multiplexing unit 10 time-multiplexes the pilot signal generated by the pilot signal generation unit 13.
  • the GI insertion unit 11 inputs a guard interval GI.
  • the D / A converter 42 generates a transmission signal by D / A converting the signal inserted with the guard interval GI.
  • the transmission filter unit 12 performs waveform shaping of the transmission signal.
  • the radio unit 43 converts the transmission signal into a radio frequency.
  • the transmission antenna unit 14 transmits a transmission signal converted into a radio frequency.
  • FIG. 1 shows the interleaving performed by the interleaver unit 7 , in which a plurality of chips in a spreading unit are grooved and the interleaving in units of groups is described.
  • Figure 2 shows the As an example of interleaving, an example is shown in which chips that have been spread in the frequency axis with a spreading factor of “8” are grouped every two chips and rearranged in the subcarrier direction.
  • Fig. 1 shows the interleaving in which chips that have been spread in the frequency axis with a spreading factor of “8” are grouped every two chips and rearranged in the subcarrier direction.
  • the number of subcarriers is N, and the darno rape is performed every two chips from the chip assigned to the first subcarrier, one group of chip N-1 and chip N). Interleaving is then performed by rearranging the groups in the frequency direction.
  • the interleaver unit 7 stores a rearrangement destination position for each chip in advance, and arranges each input chip at the stored rearrangement destination position. That is, the interleaver part
  • the spreading direction here, frequency axis direction
  • the number of chips here, 2
  • the spreading factor here, “8”.
  • Interleaving is performed by rearranging the order of the spreading direction (here, the frequency axis direction) in units of units.
  • FIG. 3 shows a frequency-selective fading environment with frequency fluctuations in the coordinate plane with the horizontal axis representing frequency and the vertical axis representing received power when a grooving interleaver (interleaver unit 7) is used.
  • the figure shows the received power frequency characteristics of the received signal that has passed through the propagation path below, with the Dinterleave operation performed on the receiving side.
  • the received signal indicates 16 chips corresponding to 2 symbols on the frequency axis. Since the interleaver unit 7 performs rearrangement in units of two adjacent chips, the interleaver unit 7 is arranged in a different frequency region for each group due to rearrangement. Therefore, the interleaver unit 7 is affected by frequency fluctuations. The received power tends to be different for each group.
  • the 1st, 2nd, 5th and 6th chips of symbol 1 and the 3rd, 4th, 5th and 6th chips of symbol 2 are Power that provides enough received power
  • the third, fourth, seventh, and eighth chips of Simponole 1 and the first, second, seventh, and eighth chips of Simponole 2 are strongly attenuated. It may happen that the received power cannot be obtained.
  • the received signals are “1 1 0 0 1 1 0 0” and “1 1 0 0 1 —1 0 0”, respectively. Become. Multiplying the received signal including these two signals by spreading code C
  • the grouped interleaver performed by the interleaver unit 7 varies within the spreading unit as in the case of the chip interleaver, but no inter-code interference MCI occurs even when despreading is performed. This is because C binding force 3 ⁇ 4 orthogonality is maintained for each chip.
  • An interleaver grouped in this way has the effect of eliminating the reception quality difference for each symbol, which is a problem with symbol interleaving, and suppressing the disruption of orthogonality, which is a problem with chip interleaving.
  • the interleaving method performed by the interleaver unit 7 includes, for example, rearrangement at random, ERA, and erformance Comparison of Cnannel Interleaving Methods in Frequency Domain for VSF-OFCDM Broadband Wireless Access in Forwar d Link (N Maeda, H. Atarashi, M. Sawahashi, IEICE trans. Commun., Vol. E86-B) may be used, and the interleaving method and block interleaving may be used. Anything can be used if done.
  • the chip grouping method uses, for example, an orthogonal code such as a Hadamard code, so the spreading factor is 2 k (k is an integer of 1 or more). , 2 chips, 4 chips,...
  • the number of chips in each group should be a power of two. For example, if the spreading factor is 8, you may group every 4 chips so that the number of chips is equal! /, And the 8 chips that are the unit of the result of the spreading process will be divided into two 2-chip groups. It may be grouped into a group of 4 chips. That is, when orthogonal codes are used, the chips corresponding to each group in the spread code are The arrangement of the spreading code used in spreading section 5 and the group for interleaving in interleaver section 7 may be selected so as to be orthogonal between the spreading codes in the range.
  • the spreading factor is generally not a power of 2, and therefore it cannot be divided into groups with an equal number of chips.
  • the grouping may be performed with the number of chips having a low correlation.
  • the spreading code used in spreading section 5 and the group arrangement when interleaving in interleaver section 7 are selected so that the correlation between spreading codes in the range of chips corresponding to each group becomes low among the spreading codes. Please! /
  • FIG. 4 is a schematic block diagram illustrating a configuration of the receiving device according to the first embodiment.
  • the receiving apparatus includes a receiving antenna unit 15, a radio unit 52, an A / D conversion unit 53, a GI removal unit 16, a series-parallel conversion unit 17, an FFT (Fast Fourier Transformation) unit 18, a propagation path compensation unit 19, and a dintarreever unit 20. .., 26-Cn, and propagation path estimation unit 25.
  • the despreading unit 21, parallel-serial conversion unit 22, demodulating unit 23, decoding unit 24, and code separation unit 26-;!-26-Cn are also included.
  • the radio unit 52 converts the signal received by the receiving antenna unit 15 from a radio frequency into a baseband signal (hereinafter referred to as a received signal).
  • the A / D conversion unit 53 generates a digital signal obtained by A / D converting the received signal and inputs the digital signal to the GI removal unit 16.
  • the GI removal unit 16 removes the guard interval from the input digital signal, and the serial / parallel conversion unit 17 performs serial / parallel conversion on the signal from which the guard interval has been removed.
  • the FFT unit 18 performs time-frequency conversion on the serial / parallel converted signal and inputs the signal to the propagation path compensation unit 19.
  • the propagation path compensation unit 19 suppresses frequency fluctuations based on the propagation path estimated by the propagation path estimation unit 25.
  • the propagation path estimation performed by the propagation path estimation unit 25 is performed by using, for example, an RLS (Recursive Least Square) algorithm using a pilot signal.
  • H (n) be the transfer function of the nth subcarrier in the propagation path estimated by the propagation path estimator 25.
  • the MMSE weight W (n) used in the propagation path compensation unit 19 is, for example, as shown in the following equation (1). Where * represents the complex conjugate and H * (n) represents the complex conjugate of H (n).
  • the propagation path compensation unit 19 uses W (n) in Equation (1) to Calculate and output S (n) expressed by equation (2).
  • the output S (n) of the propagation path compensator 19 is processed by the Dinterleaver unit 20 by performing a reverse process to that performed by the interleaver unit 7 on the transmission side and performing interleaving. Dinter leave by returning to the order in which it was before.
  • the code separation unit 26— ;! to 26—Cn obtains information bits in each code channel.
  • despreading unit 21— ;! to 21—Cn performs despreading by multiplying the deinterleaved signal by a spreading code corresponding to each code channel.
  • the parallel-to-serial converter 22 performs parallel-to-serial conversion on the despread signal, the demodulator 23 calculates a bit LLR (Log Likelihood Ratio) from the despread signal, and the decoder 24 makes an error with respect to the bit LLR. A correction decoding process is performed, and the obtained information bits are output. The processing of the demodulator 23 is performed later.
  • LLR Log Likelihood Ratio
  • a repetitive parallel MCI canceller is used on the receiving side.
  • the repetitive MCI canceller generates MCI replicas on the receiving side and subtracts it from the received signal to suppress inter-code interference MCI.
  • FIG. 5 shows the configuration of the receiving device in the second embodiment.
  • the receiving device includes a receiving antenna unit 15, a radio unit 52, an A / D conversion unit 53, a GI removal unit 16, a serial-parallel conversion unit 17, an FFT unit 18, a code separation unit 31—l—31-Cn, and a code channel replica signal.
  • Code separation unit 31— ;! to 3 1— Cn is added to addition unit 30— ;! to 30—N, propagation path compensation unit 32, Dinter river unit 20, and despreading unit 21— ;!
  • the code channel replica signal generation unit 28— ;! to 28—Cn includes a symbol replica generation unit 27, a serial-parallel conversion unit 4, and a spreading unit 5, respectively.
  • the radio unit 52 converts the signal received by the receiving antenna unit 15 from a radio frequency into a baseband signal (hereinafter referred to as a received signal).
  • the A / D conversion unit 53 generates a digital signal obtained by A / D converting the received signal and inputs the digital signal to the GI removal unit 16.
  • the GI removal unit 16 removes the guard interval from the input digital signal, and the serial / parallel conversion unit 17 performs serial / parallel conversion on the signal from which the guard interval has been removed.
  • the FFT unit 18 performs time-frequency conversion on the serial / parallel converted signal, and inputs the conversion result to the code separation unit 31— ;! to 31—Cn. Code separation unit 31— ;!
  • Cn subtracts the MCI replica generated by the MCI replica generation unit 29 in the addition units 30-1 to 30-N from the input signal, thereby inter-code interference. Suppress MCI. Thereafter, the channel compensation unit 32 suppresses the frequency fluctuation.
  • the MMSE weight Wc (n) when the MCI canceller is applied uses, for example, the following equation (3) using the estimated transfer function H (n).
  • Equation (1) is used for the initial processing that cannot generate a replica. If the received signal after subtraction of the MCI replica, that is, the output of the adder 30— ⁇ is Rc (n), the propagation path compensator 32 calculates Sc (n) represented by the following equation (4) and outputs it. To do.
  • the Dinterleaver unit 20 performs Dinterleave on the output Sc (n) of the propagation path compensation unit 32. As described in the first embodiment, the processing in the Dinterleaver unit 20 performs reverse processing of interleaving that groups a plurality of chips performed on the transmission side.
  • the despreading unit 21— ;! to 21—Cn performs despreading by multiplying the corresponding spreading code.
  • the despread signal is parallel-serial converted by the parallel-serial converter 22, the bit LLR is obtained by the demodulator 23, and error correction decoding processing is performed by the decoder 33 to obtain information bits and encoded bits LLR . If no error is detected in the information bits, or if the number of repetitions is less than the specified number of repetitions, processing is repeated.
  • a CRC Cyclic Redundancy Check
  • the processing of the demodulation unit 23 will be described.
  • the spreading factor is SF
  • the signal from the first to the SF chips deinterleaved by the Dinterleaver unit 20 is the despreading unit 21 — ;! ⁇ Cn is the despread signal.
  • S ′ can be expressed by the following equation (5).
  • S is a transmission signal corresponding to S '
  • 11 is an equivalent amplitude
  • ⁇ is an error signal with an average of 0 and variance
  • the equalized amplitude is expressed by the following equation (6) as the variance of the error signal V 2 is the following formula (7).
  • W (n) in equation (1) is used in the initial processing
  • Wc (n) in equation (3) is used in the iterative processing.
  • the case of QPSK modulation is shown as an example where the demodulator 23 obtains the bit log likelihood ratio using the equivalent amplitude from S ′. Bit when S 'is sent B and b (b and b are 1 or 1), the bit sequences b and b are QPSK modulated.
  • the transmission signal S can be expressed as in equation (8).
  • bit LLR of b can be replaced by the real part and the imaginary part of equation (9)! /.
  • Re (x) represents the real part of the complex number X.
  • the coded bit LLR with the updated likelihood is output from the decoding unit 33 and input to the code channel replica signal generation unit 28— ;! to 28—Cn.
  • a symbol replica generator 27 generates a replica signal of a modulation symbol from the coded bit LLR.
  • the serial-parallel converter 4 performs serial-parallel conversion on this replica signal
  • the spreading unit 5 spreads the replica signal subjected to serial-parallel conversion with a spreading code corresponding to each code channel, thereby transmitting the transmission signal in each code channel.
  • a replica is generated and input to the MCI replica generation unit 29.
  • the MCI replica generation unit 29 generates a replica of the inter-code interference MCI using the input transmission signal replica in each code channel and the channel estimation value output from the channel estimation unit 25.
  • the symbol replica generation unit 27 calculates S,
  • FIG. 6 shows details of the MCI replica generation unit 29.
  • FIG. 6 is a schematic block diagram of the MCI replica generation unit 29 in the k-th code channel.
  • the MCI replica generation unit 29 includes a code multiplexing unit 34, an interleaver unit 7, and a transfer function multiplication unit 36.
  • the code multiplexing unit 34 multiplexes replica signals other than the replica signal of the k-th code channel. That is, 1,..., K ⁇ l, k + 1,..., Cn-th code channel replica signal is multiplexed.
  • the multiplexed replica signal is interleaved by the interleaver unit 7 in the same manner as on the transmission side, and the transfer function multiplication unit 36 transmits the transfer function H (n (n) estimated by the propagation path estimation unit 25 in FIG. ) Is multiplied by the interleaved replica signal to generate an MCI replica frequency signal.
  • the transfer function multiplication unit 36 inputs these frequency signals to the code separation unit 31— ;!
  • the code separation unit 31— ;! to 31—Cn addition unit 30— ;! -30-N subtracts MCI replica from received signal in frequency domain to suppress inter-code interference MCI, propagation path compensation unit 32 suppresses frequency fluctuation, decoding unit 33 specifies error correction decoding process Repeat until the number of repeats or no error is detected.
  • the MCI replica is generated by the frequency signal and the inter-code interference MCI removal is performed in the frequency domain.
  • the MCI replica is generated by the time signal and is transmitted to the GI removal unit 16 in the time domain. Inter-code interference MCI cancellation may be performed.
  • the generation unit 29 and the propagation path estimation unit 25 may be realized by dedicated hardware. Each of these units is configured by a memory and a CPU (central processing unit) to realize the function of each unit. This function may be realized by the CPU executing the program for this purpose.
  • CPU central processing unit
  • the present invention is not limited to this force that is suitable for use in a mobile phone and a base station apparatus that communicate in a multi-carrier transmission scheme.

Abstract

La présente invention concerne un dispositif de transmission comportant: une unité d'étalement permettant l'étalement d'un symbole de transmission au moyen d'un code d'étalement afin de générer un signal de chaque bribe pour chaque canal ; une unité de multiplexage par code permettant le multiplexage de signaux de bribe d'une pluralité de canaux afin de générer un signal multiplexé ; et une unité d'entrelacement permettant la restructuration des signaux multiplexés dans la direction d'étalement au moyen d'un groupe de signaux multiplexés adjacents dans la direction d'étalement ayant un nombre inférieur de bribes au rapport d'étalement du code d'étalement sous forme d'une unité. Il est possible d'obtenir un effet de diversité de fréquence et d'obtenir de manière précise un symbole à partir des signaux multiplexés par code côté réception.
PCT/JP2007/066889 2006-09-06 2007-08-30 Dispositif de transmission, dispositif de réception, système de communication, et procédé de communication WO2008029704A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009142025A1 (fr) * 2008-05-23 2009-11-26 パナソニック株式会社 Dispositif de station mobile de communication sans fil et procédé de distribution et de placement pour des éléments de ressource
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JP2009302766A (ja) * 2008-06-11 2009-12-24 Sharp Corp 受信装置、通信システム及び通信方法

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