WO2014142082A1 - 送信装置、受信装置および通信システム - Google Patents
送信装置、受信装置および通信システム Download PDFInfo
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- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- 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
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- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/26265—Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
Definitions
- the present invention relates to a transmission device, a reception device, and a communication system.
- transmission path frequency selectivity and time variation occur due to multipath fading caused by reflection of a transmission signal on a building or the like and Doppler fluctuation caused by movement of a terminal.
- the received signal is a signal that interferes with a transmitted symbol and a symbol that arrives after a delay time.
- a single carrier block transmission method has recently attracted attention in order to obtain the best reception characteristics (for example, see Non-Patent Document 1 below).
- the single carrier (SC) block transmission system has lower peak power than the OFDM (Orthogonal Frequency Division Multiplexing) transmission system (for example, see Non-Patent Document 2 below), which is a multiple carrier (MC) block transmission. can do.
- OFDM Orthogonal Frequency Division Multiplexing
- a transmitter that performs SC block transmission for example, the following transmission is performed to take measures against multifading.
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- the digital modulation signal is converted into a time domain signal by the precoder and IDFT (Inverse Discrete Fourier Transform) processing unit. Convert.
- IDFT Inverse Discrete Fourier Transform
- a CP is inserted in a CP (Cyclic Prefix) insertion unit.
- the CP insertion unit copies a predetermined number of samples after the time domain signal and adds them to the beginning of the transmission signal.
- ZP Zero Padding
- a transmitter that performs SC transmission generally performs DFT (Discrete Fourier Transform) processing in a precoder.
- DFT Discrete Fourier Transform
- the transmission peak power is suppressed while reducing the influence of multipath fading.
- the phase and amplitude between the SC blocks are discontinuous, which causes an out-of-band spectrum or out-of-band leakage.
- the out-of-band spectrum becomes interference of adjacent channels and needs to be suppressed.
- a spectrum mask is defined in a general communication system, and it is necessary to suppress the out-of-band spectrum so as to satisfy the mask.
- the present invention has been made in view of the above, and an object thereof is to obtain a transmission device, a reception device, and a communication system that can suppress out-of-band spectrum.
- the present invention is a transmission apparatus that transmits a block signal including a plurality of data symbols, and is similar to a data symbol generation unit that generates data symbols in a complex plane.
- a symbol arrangement unit that generates a block symbol by arranging the data symbol and the same quadrant symbol so that a single quadrant symbol serving as a quadrant signal point is inserted at a predetermined position in each block signal per block.
- a CP insertion unit that inserts a Cyclic Prefix for the block symbol, and an interpolation unit that performs an interpolation process on the block symbol after CP insertion.
- FIG. 1 is a diagram illustrating a functional configuration example of a transmission apparatus according to the first embodiment.
- FIG. 2 is a diagram illustrating an example of a frame configuration used in a communication system that performs SC block transmission.
- FIG. 3 is a diagram showing an example in which the phase and amplitude between SC blocks are discontinuous in conventional SC block transmission.
- FIG. 4 is a diagram illustrating a fixed symbol arrangement example according to the first embodiment.
- FIG. 5 is a diagram illustrating an example of a block symbol after CP insertion.
- FIG. 6 is a diagram illustrating an example of a frame configuration according to the first embodiment.
- FIG. 7 is a diagram illustrating an example of a fixed symbol when a QPSK symbol is used as a data symbol.
- FIG. 8 is a diagram illustrating a functional configuration example of the transmission apparatus according to the second embodiment.
- FIG. 9 is a diagram illustrating an example of processing data in the transmission apparatus according to the second embodiment.
- FIG. 10 is a diagram for explaining the out-of-band leakage suppression effect by the transmission apparatus of the second embodiment.
- FIG. 11 is a diagram illustrating a functional configuration example of the transmission apparatus according to the third embodiment.
- FIG. 12 is a diagram illustrating an example of the arrangement of pilot symbols in the frequency domain.
- FIG. 13 is a diagram illustrating an example of a relationship between a time domain pilot signal and a frequency domain pilot signal.
- FIG. 14 is a diagram illustrating an example of the symbol arrangement of the present embodiment after correction by the symbol correction unit.
- FIG. 14 is a diagram illustrating an example of the symbol arrangement of the present embodiment after correction by the symbol correction unit.
- FIG. 15 is a diagram illustrating an example of a frame configuration according to Embodiment 3 in which pilot symbols are inserted into all blocks in a frame.
- FIG. 16 is a diagram illustrating an example of a frame configuration in a case where blocks into which pilot symbols are inserted and blocks into which pilot symbols are not inserted are mixed.
- FIG. 17 is a diagram illustrating a functional configuration example of the transmission apparatus according to the fourth embodiment.
- FIG. 18 is a diagram illustrating a functional configuration example of the receiving apparatus according to the fifth embodiment.
- FIG. 19 is a diagram illustrating a functional configuration example of the transmission apparatus according to the sixth embodiment.
- FIG. 20 is a diagram illustrating an example of symbol arrangement according to the sixth embodiment.
- FIG. 21 is a diagram showing a mapping area of a 64QAM constellation and a quadrant symbol.
- FIG. 22 is a diagram illustrating an example of a block symbol when 64QAM is used.
- FIG. 23 is a diagram illustrating an example of a block symbol when 64QAM is used.
- FIG. 24 is a diagram illustrating an arrangement example of fixed symbols according to the seventh embodiment.
- FIG. 1 is a diagram illustrating a functional configuration example of a first embodiment of a transmission device according to the present invention.
- the transmission apparatus according to the present embodiment includes a data symbol generation unit 1, a fixed symbol arrangement unit (symbol arrangement unit) 2, a CP insertion unit 3, an interpolation unit 4, and a transmission processing unit 5.
- the data symbol generator 1 generates data symbols (for example, PSK (Phase Shift Keying) symbols, QAM (Quadrature Amplitude Modulation) symbols, etc.).
- the fixed symbol arrangement unit 2 generates a block symbol in which one predetermined fixed symbol (fixed signal) is arranged at a predetermined position for a data symbol.
- the CP insertion unit 3 performs CP insertion on the block symbols generated by the fixed symbol arrangement unit 2.
- the interpolation unit 4 performs an interpolation process on the block symbol after CP insertion.
- the transmission processing unit 5 performs transmission filter processing, analog signal conversion processing, and the like on the block symbol of the interpolation processing unit, and transmits it as an SC block signal (block signal).
- FIG. 2 is a diagram illustrating an example of a frame configuration used in a communication system that performs SC block transmission.
- D k (n) in FIG. 2 indicates the k-th symbol of the n-th block.
- SC block is composed of N b symbols
- one frame shows an example composed of N F SC block.
- FIG. 3 is a diagram showing an example in which the phase and amplitude between SC blocks are discontinuous in conventional SC block transmission.
- an out-of-band spectrum or out-of-band leakage occurs between the kth block and the (k + 1) th block.
- Such an out-of-band spectrum becomes interference of adjacent channels.
- out-of-band spectrum is reduced by inserting fixed symbols between data symbols and performing CP insertion after the insertion of fixed symbols.
- the fixed symbol arrangement unit 2 arranges one predetermined fixed symbol “A” for the data symbol at a predetermined position.
- the fixed symbol may be any symbol as long as it satisfies the regulations of the applied communication system, and may be a symbol such as a PSK symbol or a QAM symbol.
- FIG. 4 is a diagram illustrating a fixed symbol arrangement example according to the present embodiment.
- the fixed symbol “A” is inserted in the NN CP + 1st position within a block symbol (a symbol group constituting one block).
- d k represents the k-th data symbol among the data symbols in one block.
- FIG. 5 is a diagram illustrating an example of a block symbol after CP insertion.
- the CP insertion unit 3 copies (duplicates) the last N CP symbols of the block symbol after the fixed symbol insertion, and adds it to the head of the block symbol, as shown in FIG.
- FIG. 6 is a diagram illustrating an example of a frame configuration according to the present embodiment. As shown in FIG. 6, a fixed symbol is inserted at the same position (N ⁇ N CP +1) of each block in the frame. In this way, if the first (NN CP + 1) th symbol in the region copied by the CP insertion unit is set as a fixed symbol, the first symbol of the block after CP insertion becomes a fixed symbol.
- FIG. 7 is a diagram illustrating an example of a fixed symbol when a QPSK symbol is used as a data symbol.
- a data symbol is assigned to one of four points shown as a QPSK constellation (abbreviated as a constellation in the figure) shown in the upper part of FIG. 7 according to information to be transmitted.
- the 1st symbol and the NN CP + 1st symbol become fixed symbols and are fixed at 1 + j.
- FIG. 7 is an example, and the fixed symbol is not limited to the QPSK symbol, and the fixed symbol value is not limited to 1 + j.
- N CP 0, the CP insertion unit 3 does not perform copy processing.
- an oversampling process (a process of increasing the sampling rate, that is, reducing the sampling interval) is performed. Oversampling is performed on the time domain signal input to the interpolation unit 4 so that L sampling points per symbol are obtained. That is, oversampling is performed so that the sampling rate is L times the input.
- the oversampling rate is a value indicating how many times the sampling rate after oversampling is higher than the input sampling rate.
- the interpolation unit 4 converts an input time domain signal into a frequency domain signal, performs zero insertion processing for inserting zeros into the frequency domain signal, and converts the signal into a time domain signal again. To do.
- oversampling processing can be performed using zero insertion processing.
- the oversampling process (interpolation process) in the interpolation unit 4 may use other interpolation methods. A method of performing interpolation (oversampling) without changing to a frequency domain signal may be used.
- Sample points interpolated between symbols are added by the oversampling process (interpolation process) of the interpolation unit 4.
- the last sample of the SC block and the first sample (fixed symbol) of the next SC block are added.
- An oversampling process is performed so that the phase and amplitude are smoothly connected. For example, interpolation is performed assuming that there is a fixed symbol point next to the last sample point of the SC block, and an interpolation point is added after the last sample point of the SC block.
- the oversampling rate is L
- the number of samples of the output signal of the interpolation unit 4 is (N + N CP ) ⁇ L.
- the “fixed symbol” indicates a symbol whose phase and amplitude are fixed, but a symbol in a specific quadrant may be used.
- the above processing is performed for each single carrier block symbol.
- the oversampling rate L need not be an integer.
- fixed symbol placement unit 2 places a fixed symbol at the beginning of the area copied by data CP insertion unit 3 for each data symbol for each block, and inserts a CP.
- the unit 3 performs CP insertion on the block symbol after the fixed symbol insertion.
- the interpolation unit 4 performs oversampling processing on the block symbol after CP insertion. For this reason, the continuity of the phase and amplitude between blocks is maintained, and the out-of-band spectrum can be suppressed.
- FIG. FIG. 8 is a diagram illustrating an example of a functional configuration of the transmission apparatus according to the second embodiment of the present invention.
- FIG. 8 illustrates a configuration example of the interpolation unit 4 of the transmission apparatus according to the first embodiment.
- the interpolation unit 4 in FIG. 1 includes a DFT unit (Fourier transform unit) 41, a waveform shaping filter 42, and an oversampling / IDFT (Inverse DFT) unit (inverse Fourier transform unit) 43.
- IDFT Inverse DFT
- Data symbol generation unit 1, fixed symbol arrangement unit 2, CP insertion unit 3 and transmission processing unit 5 are the same as those in the first embodiment.
- Components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant description is omitted.
- the DFT unit 41 performs (N + N CP ) point DFT processing to convert an input time domain signal into a frequency domain signal.
- the waveform shaping filter processing unit 42 performs a filtering process for removing signals other than the desired frequency domain from the frequency domain signal.
- this filtering processing for example, "T. S. Rappaport,” Wireless Communications “, 2 nd edition, Prentice Hall PTR, 2002” (hereinafter referred to Rappaport document) using a process such as Nyquist filtering that is described in be able to.
- the filtering process is not limited to this.
- the oversampling process / IDFT unit 43 increases the number of samples L times by zero insertion or the like with respect to the frequency domain signal after the filtering process (increases the number of samples corresponding to the oversampling rate L). Thereafter, the oversampling process / IDFT unit 43 performs IDFT processing on the frequency domain signal to generate a time domain signal.
- the number of samples of the IDFT processing is L ⁇ (N + N CP ).
- an oversampling processing unit that performs oversampling processing and an IDFT unit that performs IDFT processing may be provided.
- N + N CP 2 p (P is an integer of 1 or more)
- L is preferably an integer.
- the waveform shaping filter 42 changes the number of signal samples, it is desirable that the number of samples to be input to the IDFT processing is 2 p ′ (P ′ is an integer of 1 or more).
- N A N + N CP in this example, but N A > N + N CP may be used.
- the waveform shaping filter unit does not change the number of points, s i (0 ⁇ i ⁇ N + N CP ⁇ 1) is output from the waveform shaping filter unit, and 0 (bold) 1, M is 1 ⁇ M zero.
- s i is mapped to the N A carrier in the oversampling processing / IDFT unit 43 as shown in the following equation (1). Further, zero insertion is performed for y (bold) and oversampling is performed. In this case, the number of output samples of the oversampling / IDFT unit 43 may be N A * L. Note that any process may be used for mapping to total carriers.
- FIG. 9 is a diagram illustrating an example of processing data in the transmission apparatus according to the present embodiment.
- BPSK Binary Phase Shift Keying
- the numbers are rounded to the fifth decimal place for the sake of simplicity.
- the fixed symbol is inserted at the first and thirteenth symbol and output from the CP insertion unit 3.
- a symbol serving as an interpolation point is added after the last symbol in the symbol group.
- the zero insertion method in this example is merely an example, and other zero insertion methods such as performing zero insertion after applying a cyclic shift to the signal in the frequency domain may be used.
- FIG. 10 is a diagram for explaining the out-of-band leakage suppression effect by the transmission apparatus of the present embodiment.
- FIG. 10 shows a transmission signal 101 when the out-of-band leakage suppression using the above-described fixed symbol according to the present embodiment is performed, and a transmission signal 102 when the out-of-band leakage suppression is not performed.
- the desired band is shown in the center, and areas that cause out-of-band leakage are shown at both ends of the desired band.
- the out-of-band leakage is reduced by about 16 dB in the transmission signal 101 in which out-of-band leakage suppression is performed, compared to the transmission signal 102 in the case where out-of-band leakage suppression is not performed.
- N A 512
- the waveform shaping filter uses the frequency domain zero roll-off filter described in the Rappaport literature, and the frequency domain
- the mapping to the carrier was performed as shown in the following formula (2).
- the signal y (bold) is an input value of the oversampling process / IDFT unit 43.
- the oversampling process / IDFT unit 43 performs the oversampling process, and after the oversampling process These signals are converted into time domain signals by IDFT. For this reason, as described in Embodiment 1, the continuity of the phase and amplitude between the blocks is maintained, and the out-of-band spectrum can be suppressed.
- N CP 0, the CP insertion unit 3 in FIG. 8 does not perform the copy process, and d 0 (first symbol in the block) is set as a fixed symbol in the fixed symbol arrangement unit 2.
- FIG. FIG. 11 is a figure which shows the function structural example of Embodiment 3 of the transmitter concerning this invention.
- FIG. 11 illustrates a configuration example of the interpolation unit 4 of the transmission apparatus according to the first embodiment.
- the transmission apparatus of the present embodiment includes a data symbol generation unit 1, a fixed symbol arrangement unit 2, a CP insertion unit 3, a symbol correction unit 40, a DFT unit 41, waveform shaping filters 42-1 and 42-2, pilot signal generation / A CP processing unit 6, a frequency domain multiplexing unit 7, an oversampling / IDFT unit 43 and a transmission processing unit 5 are provided.
- Data symbol generation unit 1 fixed symbol arrangement unit 2, CP insertion unit 3, DFT unit 41, oversampling / IDFT unit 43, and transmission processing unit 5 are the same as those in the second embodiment.
- Components having the same functions as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and redundant description is omitted.
- pilot signal that is a known signal may be used to perform synchronization processing or transmission path estimation on the receiving side.
- pilot signals pilot symbols
- pilot symbols are generally arranged in the frequency domain.
- pilot signals pilot symbols
- the pilot signal generation / CP processing unit 6 generates a pilot signal in the time domain and a pilot signal in the frequency domain, inputs the pilot signal in the frequency domain to the waveform shaping filter 42-2, and corrects the pilot signal in the time domain by symbol correction. Input to the unit 40.
- the pilot signal generation / CP processing unit 6 may add CP processing (CP insertion processing) to the pilot symbols in the time domain. Further, the pilot signal generation / CP processing unit 6 may normalize the pilot signal.
- the time domain signal of the pilot signal is q 0 , q 1 ,..., Q N-1 and N CP is the CP length
- q N-NCP q N ⁇ 1 , q 1 , q after CP processing 0 , q 1 ,..., Q N-1 (in the subscript, N CP is expressed as NCP).
- the pilot signal generation / CP processing unit 6 generates a signal obtained by performing DFT processing on the signal inserted into the time domain signal of the pilot signal as the frequency domain pilot signal.
- the frequency domain pilot signal is used for multiplexing, and the time domain pilot signal is used for fixed symbol calculation.
- the frequency domain multiplexing unit 7 converts the data symbol converted into the frequency domain signal by the DFT unit 41 input via the waveform shaping filter 42-1, and the frequency domain pilot signal (via the waveform shaping filter 42-2). Pilot symbols) in the frequency domain.
- the waveform shaping filters 42-1 and 42-2 are the same as the waveform shaping filter 42 of the second embodiment.
- the waveform shaping filter 42-1 performs waveform shaping in the frequency domain on the output from the DFT unit 41, and the waveform shaping filter 42-2 performs waveform shaping on the pilot symbols in the frequency domain. There are no particular restrictions on the pilot signal, and any signal may be used.
- the time domain pilot signal is generated based on the arrangement position of the pilot signal in the frequency domain.
- FIG. 12 is a diagram illustrating an example of the arrangement of pilot symbols in the frequency domain.
- N ′ / 2 An example in which the number of data symbols including symbols is N ′ / 2 is shown.
- pilot symbols p 0 , p 1 ,..., P N ′ / 2-1 in the frequency domain are replaced with data symbol symbols s 0 , s 1 ,. 1 and are arranged alternately.
- FIG. 12 is an example, and there are no restrictions on the pilot symbol arrangement and the number of pilot symbols in the block symbol.
- the fixed symbol in the time domain signal that is the IDFT output (output from the oversampling process / IDFT unit 43) is “ To set A ′′, it is necessary to consider a time domain pilot signal.
- the pilot signal time domain signals are q 0, q 1, q 2, ...
- the values of b k ′ and c k ′ are determined by the pilot signal insertion position and fixed symbol arrangement position in the frequency domain.
- N T N ′ / 2
- the data symbols into which the CP has been inserted are assumed to be x 0 , x 1 ,..., X ND ⁇ 1 .
- the pilot symbol p (bold) z arranged in the frequency domain is represented by the following expression (3).
- the pilot symbol q (bold) in the time domain after IDFT processing is expressed by the following equation (4).
- the pilot signal multiplexed in the frequency domain and the data signal to which DFT processing is added are expressed by the following equation (7), and the time domain signal after the IDFT processing is expressed by the following equation (8).
- FIG. 13 is a diagram illustrating an example of the relationship between a time domain pilot signal and a frequency domain pilot signal.
- FIG. 13 is based on the arrangement of data symbols and pilot symbols in the frequency domain shown in FIG.
- a time domain pilot signal is obtained by performing IDFT processing using a signal obtained by replacing a data symbol (including a fixed symbol) portion with 0 as an input of IDFT processing. Can be obtained.
- a time-domain pilot signal that does not perform oversampling is shown for the sake of simplification, but a pilot signal that has been subjected to oversampling such as zero insertion may be used in the frequency domain. .
- FIG. 14 is a diagram illustrating an example of the symbol arrangement of the present embodiment after correction by the symbol correction unit 40.
- the total number of symbols before CP insertion in one block is N
- phase rotation and amplitude adjustment may be applied to the fixed symbol, or a fixed signal may be added.
- FIG. 14 shows that the ⁇ N CP + 1st symbol and the N / 2 ⁇ N CP + 1th symbol are adjusted, only the ⁇ N CP + 1th symbol may be adjusted.
- FIG. 15 is a diagram illustrating an example of a frame configuration (fixed symbols and data symbols after correction by the symbol correction unit 40) of the present embodiment when pilot symbols are inserted into all blocks in the frame. As shown in FIG. 15, the fixed symbols after correction are inserted so that the fixed symbol insertion positions are the same between the blocks.
- Embodiment 1 is an example in which block symbols are configured only by data symbols
- Embodiment 2 is an example in which block symbols are configured by pilot symbols and data symbols, but fixed symbols in the time domain. Can be arranged in the same position for each block, a frame configuration combining the two embodiments may be used. Also in this case, an out-of-band spectrum suppression effect can be obtained.
- FIG. 16 is a diagram illustrating an example of a frame configuration in a case where blocks into which pilot symbols are inserted and blocks into which pilot symbols are not inserted are mixed. In FIG.
- FIG. 17 is a diagram illustrating a functional configuration example of the transmission apparatus according to the fourth embodiment of the present invention.
- the transmission apparatus of the present embodiment includes a data symbol generation unit 1, a fixed symbol arrangement unit 2, a CP insertion unit 3, a symbol correction unit 40, an interpolation unit 4, a pilot signal generation / CP processing unit 61, a time domain multiplexing unit 8, and A transmission processing unit 5 is provided.
- Data symbol generation unit 1, fixed symbol arrangement unit 2, CP insertion unit 3, interpolation unit 4, and transmission processing unit 5 are the same as those in the first embodiment.
- the symbol correction unit 40 is the same as that in the second embodiment. Components having the same functions as those in the first or second embodiment are denoted by the same reference numerals as those in the first or second embodiment, and redundant description is omitted.
- pilot signals are multiplexed in the time domain.
- the pilot signal generation / CP processing unit 61 generates a time domain pilot signal and inputs it to the time domain multiplexing unit 8 and the symbol symbol correction unit 40.
- the interpolation unit 4 generates time-domain data symbols (including fixed symbols)
- the time-domain multiplexing unit 8 includes time-domain data symbols (including fixed symbols) and time-domain data symbols.
- the pilot signal is multiplexed in the time domain.
- the symbol correction unit 40 corrects fixed symbols. For this reason, even when pilot signals are multiplexed in the time domain, the continuity of phase and amplitude between blocks is maintained, and the out-of-band spectrum can be suppressed.
- FIG. FIG. 18 is a diagram illustrating a functional configuration example of a fifth embodiment of the receiving device according to the present invention.
- the receiving apparatus according to the present embodiment receives the SC block signal transmitted by the transmitting apparatus described in the first to fourth embodiments.
- the reception / synchronization processing unit 10 performs synchronization processing such as frame synchronization, frequency synchronization, and symbol synchronization on the received signal (SC block signal).
- CP removing section 11 performs CP removal on the received signal after the synchronization processing.
- the DFT unit 12 performs DFT processing on the received signal from which the CP has been removed.
- the transmission path estimation unit 13 performs transmission path estimation based on the signal after DFT processing.
- the sampling / interference removal processing unit 14 performs a downsampling process on the signal after the DFT process.
- the FDE unit (equalization processing unit) 15 performs FDE (Frequency Domain Equalizer) processing based on the downsampled signal and the transmission path estimation result.
- the IDFT unit 16 performs IDFT processing on the signal after the FDE processing.
- Fixed symbol removal / demodulation / decoding section 17 removes fixed symbols from the signal after IDFT processing, and performs demodulation / decoding processing on the signal after fixed symbol removal.
- the fixed symbol removal / demodulation / decoding unit 17 performs fixed symbol removal and demodulation / decoding processing, but the fixed symbol removal unit and demodulation / decoding processing for removing fixed symbols are performed. You may make it each provide the demodulation / decoding part to perform.
- the oversampling process is performed on the signal including the CP subjected to the DFT process on the transmission side, the CP component enters the data area. Therefore, if necessary, CP interference cancellation is performed on the receiving side. For example, since the value of the CP symbol and the interference value can be estimated in the synchronization processing unit 10, the CP interference value can be given to the sampling / interference removal processing unit 14 to perform CP interference removal. Further, CP estimation may be performed in the transmission path estimation unit 13.
- the receiving apparatus that receives the SC block signal transmitted by the transmitting apparatus described in Embodiments 1 to 3 has been described.
- the received signal is demodulated and decoded.
- FIG. 19 is a diagram illustrating a functional configuration example of the transmission apparatus according to the sixth embodiment of the present invention.
- the transmission apparatus according to the present embodiment includes a data symbol generation unit 1, a quadrant mapping unit 21, a CP insertion unit 3, a DFT unit 41, a waveform shaping filter 42, an oversampling / IDFT unit 43, and a transmission processing unit 5.
- Data symbol generation unit 1, CP insertion unit 3, DFT unit 41, waveform shaping filter 42, oversampling processing / IDFT unit 43, and transmission processing unit 5 are the same as those in the second embodiment.
- Components having the same functions as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and redundant description is omitted.
- the same quadrant mapping unit 21 performs mapping so that a symbol at a predetermined position in the block becomes the same quadrant symbol in the time domain.
- FIG. 20 is a diagram illustrating an example of the symbol arrangement of the present embodiment.
- Symbol A (i) indicates the same quadrant symbol of the i-th block.
- a (i-1) and A (i) are mapped to the same quadrant, though not necessarily the same.
- FIG. 21 is a diagram showing a mapping area of a 64QAM constellation and a quadrant symbol.
- a 64QAM symbol is used as a data symbol
- the same quadrant symbol is mapped to, for example, a point in the upper right quadrant (area surrounded by a dotted line in FIG. 21).
- the symbol A (i) which is the same quadrant symbol of the i-th block, has only to be arranged in the area indicated by the dotted line, the upper 2 bits of the same quadrant symbol are fixed to “00”.
- the remaining lower 4 bits can be used as data bits.
- the upper 2 bits of the same quadrant symbol placed at a predetermined position in the time domain are fixed to “00”, and the lower 4 bits are set to arbitrary values.
- the mapping area of the same quadrant symbol is set in one quadrant, but the same quadrant symbol may be mapped in a narrower area in the same quadrant.
- FIG. 22 and 23 are diagrams illustrating examples of block symbols when 64QAM is used.
- FIG. 22 shows an example in which the NN CP +1 symbol is the same quadrant symbol, the upper 2 bits of the same quadrant symbol are fixed to “01”, and the same processing is given to all blocks.
- FIG. 23 shows an example in which the NN CP +1 symbol is the same quadrant symbol, the upper 4 bits of the same quadrant symbol are fixed to “0100”, and the same processing is given to all blocks.
- the number of data bits per block symbol is 6N-2 bits
- the number of data bits per block symbol is 6N-4 bits.
- the configuration example in which interpolation using DFT is performed is shown.
- the same quadrant symbol is used instead of the fixed symbol in the configuration example in which the interpolation unit 4 is used.
- the receiving apparatus that receives the signal transmitted from the transmitting apparatus according to the present embodiment is the same as the fixed symbol removing / demodulating / decoding unit 17 of the receiving apparatus described in the fifth embodiment in place of fixed symbol removal.
- the remainder after removing the fixed bits is treated as a data bit, and the decoding process is performed.
- the same quadrant symbol is arranged instead of the fixed symbol. For this reason, data loss can be reduced compared with the case where a fixed symbol is used.
- the present invention is not limited to this, and can be applied to various types of transmission devices and reception devices including wired communication. Further, generation of the fixed symbol and the same quadrant symbol has been described, but the present invention is not limited to the example described above, and for example, a plurality of methods may be combined. Further, the configurations of the transmitting device and the receiving device are not limited to the device configurations shown in the respective embodiments. As the interpolation method and transmission processing method used in the oversampling process described in the embodiment, any method can be used as long as the continuity of the first and last samples is maintained in the SC block symbol. May be.
- Embodiment 7 FIG. Next, a transmission apparatus according to the seventh embodiment will be described.
- FIG. 24 is a diagram illustrating an arrangement example of fixed symbols according to the present embodiment.
- N CP 0, fixed symbols are inserted around the first symbol and the last symbol in the block in order to improve the suppression effect of the out-of-band spectrum.
- F i indicates a fixed symbol.
- N L + N R +1 out of N symbols in one block are fixed symbols.
- N R indicates the number of consecutive fixed symbols arranged on the right side from the first symbol.
- N L is the number of fixed symbols consecutive on the left side from the last symbol. In the present embodiment, this N L + N R +1 fixed symbols are referred to as fixed symbol sequences. As shown in FIG.
- F i the fixed symbol sequence [F -NL, F -NL + 1 , F -NL + 2, ..., F -1, F 0, F 1, ..., F NR] denoted.
- NL and NR in the subscript indicate N L and N R , respectively.
- F i may be set to have different values.
- F i may use symbols such as M-PSK (M-ary-Phase Shift Keying) and M-QAM (M-ary Quadrature Amplitude Modulation), and some of F i may be zero. It may be set to.
- a sequence described in “D. C. Chu,“ Polyphase Codes With Good Periodic Correlation Properties ”, IEEE Transactions on Information Theory, pp. 531-532, July 1972” may be used as a fixed symbol sequence.
- the same fixed symbol sequence is used in all blocks, and the same fixed symbols are arranged at the same position between blocks.
- the arrangement method of the fixed symbol series is as follows. F 0 of the fixed symbol series is arranged at the first position in the block. And these positional reference in the order of the fixed symbol sequence a [F -NL, F -NL + 1 , F -NL + 2, ..., F -1, F 0, F 1, ..., F NR] symbols However, the fixed symbols are arranged on the left and right of the reference position so that they are arranged in the order without changing the relative order.
- sample points interpolated between symbols are added. Due to the cyclic nature of the IDFT output, the interpolation point added after the last symbol is the last symbol. The point is to interpolate between F ⁇ 1 and the first (first) symbol F 0 . For this reason, the continuity of the phase and amplitude between blocks can be maintained, and an out-of-band spectrum can be suppressed. Further, by increasing N L and N R , further out-of-band spectrum suppression effect can be obtained.
- the fixed symbol series is the same between the blocks.
- the fixed symbol series may be configured to have the same quadrant symbol between the blocks. .
- the first (upper) bit of the symbol with the symbol number N is fixed to “00”
- the fixed symbol sequence of the present embodiment may be used.
- the same fixed symbol series is arranged in each block around the reference position with the first block symbol as the reference position. For this reason, the continuity of the phase and amplitude between blocks can be maintained, and an out-of-band spectrum can be suppressed.
- the transmission device, the reception device, and the communication system according to the present invention are useful for a communication system that performs SC block transmission.
- 1 data symbol generation unit 1 fixed symbol placement unit, 3 CP insertion unit, 4 interpolation unit, 5 transmission processing unit, 6, 61 pilot signal generation / CP processing unit, 7 frequency domain multiplexing unit, 8 time domain multiplexing unit, 21 Same quadrant mapping unit, 40 symbol correction unit, 41 DFT unit, 42, 42-1, 42-2 waveform shaping filter, 43 oversampling processing / IDFT unit, 10 reception / synchronization processing unit, 11 CP removal unit, 12 DFT unit , 13 Transmission path estimation unit, 14 Sampling / interference removal processing unit, 15 FDE unit, 16 IDFT unit, 17 Fixed symbol removal / demodulation / decoding unit.
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Abstract
Description
図1は、本発明にかかる送信装置の実施の形態1の機能構成例を示す図である。図1に示すように、本実施の形態の送信装置は、データシンボル生成部1、固定シンボル配置部(シンボル配置部)2、CP挿入部3、補間部4および送信処理部5を備える。
図8は、本発明にかかる送信装置の実施の形態2の機能構成例を示す図である。図8では、実施の形態1の送信装置の補間部4の構成例を示している。本実施の形態では、図1の補間部4が、DFT部(フーリエ変換部)41、波形整形フィルタ42およびオーバーサンプリング処理・IDFT(Inverse DFT)部(逆フーリエ変換部)43で構成される例を示す。データシンボル生成部1、固定シンボル配置部2、CP挿入部3および送信処理部5は、実施の形態1と同様である。実施の形態1と同様の機能を有する構成要素は、実施の形態1と同一の符号を付して重複する説明を省略する。
図11は、本発明にかかる送信装置の実施の形態3の機能構成例を示す図である。図11では、実施の形態1の送信装置の補間部4の構成例を示している。本実施の形態の送信装置は、データシンボル生成部1、固定シンボル配置部2、CP挿入部3、シンボル修正部40、DFT部41、波形整形フィルタ42-1,42-2、パイロット信号生成・CP処理部6、周波数領域多重部7、オーバーサンプリング処理・IDFT部43および送信処理部5を備える。データシンボル生成部1、固定シンボル配置部2、CP挿入部3、DFT部41、オーバーサンプリング処理・IDFT部43、送信処理部5は、実施の形態2と同様である。実施の形態2と同様の機能を有する構成要素は、実施の形態2と同一の符号を付して重複する説明を省略する。
図17は、本発明にかかる送信装置の実施の形態4の機能構成例を示す図である。本実施の形態の送信装置は、データシンボル生成部1、固定シンボル配置部2、CP挿入部3、シンボル修正部40、補間部4、パイロット信号生成・CP処理部61、時間領域多重部8および送信処理部5を備える。データシンボル生成部1、固定シンボル配置部2、CP挿入部3、補間部4、送信処理部5は、実施の形態1と同様である。シンボル修正部40は、実施の形態2と同様である。実施の形態1または2と同様の機能を有する構成要素は、実施の形態1または2と同一の符号を付して重複する説明を省略する。
図18は、本発明にかかる受信装置の実施の形態5の機能構成例を示す図である。本実施の形態の受信装置は、実施の形態1~4で説明した送信装置により送信されたSCブロック信号を受信する。
図19は、本発明にかかる送信装置の実施の形態6の機能構成例を示す図である。本実施の形態の送信装置は、データシンボル生成部1、同象限マッピング部21、CP挿入部3、DFT部41、波形整形フィルタ42およびオーバーサンプリング処理・IDFT部43および送信処理部5を備える。データシンボル生成部1、CP挿入部3、DFT部41、波形整形フィルタ42、オーバーサンプリング処理・IDFT部43および送信処理部5は、実施の形態2と同様である。実施の形態2と同様の機能を有する構成要素は、実施の形態2と同一の符号を付して重複する説明を省略する。
次に実施の形態7の送信装置について説明する。実施の形態1の図5で、NCP=0の例について説明したが、本実施の形態では、NCP=0の場合の拡張としてさらに帯域外スペクトルを抑制する固定シンボルの配置方法について説明する。
Claims (15)
- 複数のデータシンボルを含むブロック信号を送信する送信装置であって、
データシンボルを生成するデータシンボル生成部と、
複素平面において同象限の信号点となる同象限シンボルを、各ブロック信号内の所定の位置に1ブロックにつき1シンボル挿入するように、前記データシンボルおよび前記同象限シンボルを配置してブロックシンボルを生成するシンボル配置部と、
前記ブロックシンボルに対してCyclic Prefixの挿入を行うCP挿入部と、
CP挿入後の前記ブロックシンボルに対して補間処理を行う補間部と、
を備えることを特徴とする送信装置。 - データシンボルを生成するデータシンボル生成部と、
時間領域のパイロット信号を生成するパイロット信号生成部と、
複素平面において同象限の信号点となる同象限シンボルを、各ブロック信号内の所定の位置に1ブロックにつき1シンボル挿入するように、前記データシンボルおよび前記同象限シンボルを配置してブロックシンボルを生成するシンボル配置部と、
前記ブロックシンボルに対してCyclic Prefixの挿入を行うCP挿入部と、
CP挿入後の前記ブロックシンボル内の前記同象限シンボルを前記パイロット信号に基づいて修正して修正シンボルとするシンボル修正部と、
前記シンボル修正部により前記同象限シンボルが修正された後のCP挿入後の前記ブロックシンボルに対して補間処理を行う補間部と、
前記パイロット信号と、前記補間処理後の信号とを多重する時間領域多重部と、
を備え、
前記シンボル修正部は、前記時間領域多重部による多重後の前記修正シンボルに対応する位置のシンボルの値が前記シンボル配置部により生成された前記同象限シンボルの値となるよう前記同象限シンボルを修正することを特徴とする送信装置。 - 前記シンボル配置部は、前記同象限シンボルをCyclic Prefixとしてコピーされるシンボルの先頭に配置し、
前記補間部は、前記ブロックシンボルの最後のシンボルとCP挿入後の前記ブロックシンボルの先頭のシンボルとの間を補間した補間点が前記最後のシンボルの後ろに追加されるように前記補間処理を実施することを特徴とする請求項1または2に記載の送信装置。 - 前記補間部は、
前記ブロックシンボルに対してフーリエ変換処理を行うフーリエ変換部と、
前記フーリエ変換処理後のデータに対してデータ点数を増加させるオーバーサンプリング処理を行うオーバーサンプリング処理部と、
前記オーバーサンプリング処理後のデータに対して逆フーリエ変換を行う逆フーリエ変換部と、
を備えることを特徴とする請求項3に記載の送信装置。 - 複数のデータシンボルを含むブロック信号を送信する送信装置であって、
データシンボルを生成するデータシンボル生成部と、
周波数領域のパイロット信号と、前記パイロット信号の時間領域信号を生成するパイロット信号生成部と、
複素平面において同象限の信号点となる同象限シンボルを、各ブロック信号内の所定の位置に1ブロックにつき1シンボル挿入するように、前記データシンボルおよび前記同象限シンボルを配置してブロックシンボルを生成するシンボル配置部と、
前記ブロックシンボルに対してCyclic Prefixの挿入を行うCP挿入部と、
CP挿入後の前記ブロックシンボル内の前記同象限シンボルを前記時間領域信号に基づいて修正して修正シンボルとするシンボル修正部と、
前記シンボル修正部により前記同象限シンボルが修正された後のCP挿入後の前記ブロックシンボルに対してフーリエ変換処理を行うフーリエ変換部と、
前記フーリエ変換処理後のデータと前記パイロット信号とを周波数領域上で多重した多重データを生成する周波数領域多重部と、
前記多重データに対してデータ点数を増加させるオーバーサンプリング処理を行うオーバーサンプリング処理部と、
前記オーバーサンプリング処理後のデータに対して逆フーリエ変換を行う逆フーリエ変換部と、
を備え、
前記シンボル修正部は、前記逆フーリエ変換後の前記修正シンボルに対応する位置のシンボルの値が前記シンボル配置部により生成された前記同象限シンボルの値となるよう前記同象限シンボルを修正することを特徴とする送信装置。 - 前記シンボル配置部は、前記同象限シンボルをCyclic Prefixとしてコピーされるシンボルの先頭に配置することを特徴とする請求項5に記載の送信装置。
- 前記同象限シンボルとして位相および振幅が同一のシンボルを生成することを特徴とする請求項1から6のいずれか1つに記載の送信装置。
- 前記同象限シンボルのうち一部のビットをデータビットとして用いることを特徴とする請求項1から6のいずれか1つに記載の送信装置。
- 前記同象限シンボルのうち前記データビット以外のビットを固定の値とすることを特徴とする請求項8に記載の送信装置。
- フレーム内の全てのブロック信号に対して、ブロック信号内の同一位置に前記同象限シンボルが配置することを特徴とする請求項1から9のいずれか1つに記載の送信装置。
- 前記同象限シンボルに対し、それぞれ位相回転、振幅調整のうち1つ以上を加えることを特徴とする請求項1から10のいずれか1つに記載の送信装置。
- 前記所定の位置を、前記ブロックシンボルの先頭とし、
前記シンボル配置部は、前記同象限シンボルを含む複数のシンボルにより構成されるシンボル系列を生成し、前記シンボル系列は、第1のシンボル位置より前の第1のシンボル群と前記第1のシンボル位置以降の第2のシンボル群とで構成され、前記ブロックシンボルの先頭が前記第2のシンボル群の先頭となるよう前記第2のシンボル群を配置し、前記ブロックシンボルの最後のシンボルが前記第1のシンボル群の最後のシンボルとなるよう前記第1のシンボル群を配置することを特徴とする請求項1から11のいずれか1つに記載の送信装置。 - 請求項7に記載の送信装置から送信された信号を受信信号として受信する受信装置であって、
前記受信信号からCyclic Prefixを除去するCP除去部と、
Cyclic Prefix除去後の前記受信信号に対してDFT処理を行うDFT処理部と、
前記DFT処理後の信号に対してダウンサンプリング処理を行うサンプリング処理部と、
前記DFT処理後の信号に基づいて伝送路推定を行う伝送路推定部と、
前記伝送路推定の結果と前記ダウンサンプリング処理の信号とに基づいて等化処理を行う等化処理部と、
前記等化処理後の信号から所定位置に挿入されているデータシンボル以外のシンボルである固定シンボルを除去する固定シンボル除去部と、
前記固定シンボルが除去された後の信号に基づいて復調および復号を行う復調復号処理部と、
を備えることを特徴とする受信装置。 - 請求項8に記載の送信装置から送信された信号を受信信号として受信する受信装置であって、
前記受信信号からCyclic Prefixを除去するCP除去部と、
Cyclic Prefix除去後の前記受信信号に対してDFT処理を行うDFT処理部と、
前記DFT処理後の信号に対してダウンサンプリング処理を行うサンプリング処理部と、
前記DFT処理後の信号に基づいて伝送路推定を行う伝送路推定部と、
前記伝送路推定の結果と前記ダウンサンプリング処理の信号とに基づいて等化処理を行う等化処理部と、
前記等化処理後の信号のうち所定位置のデータシンボルに基づいて復調および復号を行い、一部のビットがデータビットとして用いられている所定位置の同象限シンボルについて前記同象限シンボルのデータビットに基づいて復調および復号を行う復調復号処理部と、
を備えることを特徴とする受信装置。 - 請求項1から12のいずれか1つに記載の送信装置と、
前記送信装置から送信された信号を受信する受信装置と、
を備えることを特徴とする通信システム。
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CN108737316A (zh) | 2018-11-02 |
JP6162859B2 (ja) | 2017-07-12 |
EP2975790A1 (en) | 2016-01-20 |
CN105009490A (zh) | 2015-10-28 |
JP5952487B2 (ja) | 2016-07-13 |
US11290312B2 (en) | 2022-03-29 |
US9917716B2 (en) | 2018-03-13 |
EP3499752A1 (en) | 2019-06-19 |
JP6657277B2 (ja) | 2020-03-04 |
CN105009490B (zh) | 2018-07-24 |
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