WO2016039236A1 - 無線通信装置及び方法 - Google Patents
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- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
- H03M13/45—Soft decoding, i.e. using symbol reliability information
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H04L1/0041—Arrangements at the transmitter end
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- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
- H03M13/3723—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35 using means or methods for the initialisation of the decoder
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- H03M13/61—Aspects and characteristics of methods and arrangements for error correction or error detection, not provided for otherwise
- H03M13/612—Aspects specific to channel or signal-to-noise ratio estimation
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
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- 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
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- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
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- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
- H03M13/2792—Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
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- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
- H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
- H03M13/41—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
- H03M13/4138—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors soft-output Viterbi algorithm based decoding, i.e. Viterbi decoding with weighted decisions
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- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/65—Purpose and implementation aspects
- H03M13/6508—Flexibility, adaptability, parametrability and configurability of the implementation
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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- 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
- H04L25/03891—Spatial equalizers
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- 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
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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- 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
- H04L27/38—Demodulator circuits; Receiver circuits
Definitions
- the present invention relates to a wireless communication apparatus and method, and more particularly to a wireless communication apparatus and method for decoding data by calculating soft symbols from a received signal in which codes are interleaved and modulation symbol points are scrambled.
- a modulation bit sequence x (m) (m is a symbol (in the time direction) that has been subjected to error correction coding and interleaving in the transmission-side baseband signal processing.
- Number is converted into a symbol mapping number N (m), scrambled with a predetermined scramble code N SCR (m) and converted into a transmission symbol number N TX (m), which is converted into a PSK (Phase -Shift Keying) or QAM (Quadrature Amplitude Modulation) modulation is specified for transmission.
- PSK Phase -Shift Keying
- QAM Quadrature Amplitude Modulation
- QPSK Quadrature-PSK
- 8PSK 16QAM
- 32QAM 32QAM
- 64QAM 64QAM are defined as modulation schemes to be used, and their scramble processing is defined as follows.
- PSK scrambling is It is.
- mod (A, B) is a remainder when A is divided by B.
- FIG. 1 shows PSK transmission symbol mapping numbers and their arrangement. From FIG. 1 and Equation 1, it can be seen that PSK scrambling is a phase rotation operation of ( ⁇ / 4) * N SCR (m).
- QAM scramble processing is It is.
- bitxor (A, B) is an operation for converting A and B into binary numbers and taking the XOR (exclusive OR) of each bit.
- QAM is not a simple phase rotation like PSK, but a scramble process in which symbol mapping points are irregularly replaced.
- the symbol mapping points of QAM in MIL-STD-188-110B Appendix C are arranged in a non-lattice manner (12/4 star QAM) as shown in FIG.
- a descrambling process may be performed on the received bit sequence subjected to the hard decision by an operation reverse to the scramble process of each modulation method.
- the symbol-mapped signal is rotated by ( ⁇ / 4) * N SCR (m) phase in the transmission-side baseband signal processing unit, and the reception detection signal is-( ⁇ / 4) * N SCR (m) for processing equivalent to descrambling, or mapping reference point signal to ( ⁇ / 4) * N SCR (m) phase rotation, or reference point signal symbol mapping
- a method has been proposed in which all combinations of symbol mapping points that can be taken by the number N (m) and the scramble code N SCR (m) are stored in advance in a ROM (Read Only Memory) or the like and referred to.
- the QAM descrambling method there is a method faithful to the principle of calculating a bit likelihood and then performing code conversion (equivalent to XOR operation) processing with reference to a scramble code.
- PSK and QAM can be demodulated with a simple implementation by providing a means for obtaining the reference point using the transmission symbol number that is scrambled for the symbol number at the time of reference point generation. And it aims at realizing soft symbol calculation.
- a wireless communication system includes: In the transmitter baseband signal processor, Means for converting the modulated bit sequence into a predetermined symbol mapping number; Generating means for generating a scramble code for the symbol mapping number; Means for scrambling the symbol mapping number using the scramble code to convert it to a transmission symbol mapping number; Means for mapping according to the transmission symbol mapping number and the modulation scheme; Modulation transmission means for converting the output of the mapping into a time signal, converting it to a transmission frequency and transmitting it, In the receiver baseband signal processor, Means for receiving and detecting the signal transmitted by the modulation transmission means; Means for performing channel equalization or processing corresponding to the detected signal; Means for generating a first reference point symbol mapping number for generating a reference point in the modulation scheme; Means for scrambling the first reference point symbol mapping number using the scramble code to convert it to a first reference point transmission symbol mapping number; First reference point mapping means for mapping according to the first
- a wireless communication system includes an error correction coding process in the transmission unit baseband signal processing unit, and performs an interleaving process on the error correction coded signal to perform the symbol mapping number.
- First interleaving means for outputting to the converting means, and means for deinterleaving the bit likelihood in the receiving unit baseband signal processing unit, and soft-input soft-output error correction decoding of the deinterleaved signal
- a second interleaving unit having the same interleaving pattern as the first interleaving unit with respect to the soft input / soft output error correction decoding output, and the bit likelihood of the output of the second interleaving unit is represented by a bit probability.
- Means for converting the bit probability to a symbol mapping probability based on the modulation scheme Means for generating a second reference point symbol mapping number for calculating soft symbols, and using the scramble code for the second reference point symbol mapping number, a second reference point transmission symbol mapping number is provided. And a second reference point mapping means for mapping according to the second reference point transmission symbol mapping number and the modulation scheme, the symbol mapping probability calculating means output and the second reference point mapping means output And a turbo equalizing means for feeding back the output of the soft symbol calculating means to the channel equalizing means.
- a wireless communication method includes: On the sending side, Convert the modulation bit sequence to a predetermined symbol mapping number, Generating a scramble code for the symbol mapping number; The symbol mapping number is scrambled using the scramble code and converted to a transmission symbol mapping number, Mapping according to the transmission symbol mapping number and the modulation scheme, The mapping output is converted into a time signal, converted into a transmission frequency, and transmitted.
- Channel equalization or equivalent processing is performed on the detected signal, Generating a first reference point symbol mapping number for generating a reference point in the modulation scheme; Using the scramble code, the first reference point symbol mapping number is scrambled and converted to a first reference point transmission symbol mapping number; Mapping according to the first reference point transmission symbol mapping number and the modulation scheme, Calculating the distance between the output of the mapping and the channel equalization output; The bit likelihood is calculated with reference to the first reference point symbol mapping number and the distance.
- a reference point can be generated for any symbol mapping pattern of the PSK and QAM modulation schemes, and the amount of calculation and memory can be reduced by simple methods in demodulation and soft symbol calculation.
- the implementation scale can be reduced by unifying the bit likelihood calculation processing in PSK and QAM.
- Appendix C The figure which shows the symbol mapping point arrangement
- C The functional block diagram which shows 1st embodiment of this invention.
- FIG. 3 shows the configuration of the wireless communication apparatus 1 according to the first embodiment.
- the wireless communication apparatus 1 includes an error correction encoder 11, an interleave unit 12, a serial / parallel converter 13, a symbol mapping number converter 14, a scramble code generator 15, and a transmission symbol mapping number converter 16.
- a reference point transmission symbol mapping number generation unit 25 a reference point symbol mapping unit 26, a bit LLR calculation unit 27, a deinterleave unit 28, and an error correction decoder 29.
- the error correction encoder 11 performs an error correction encoding process such as a convolutional encoding process on the input information bit sequence and outputs the result to the interleaving unit 12.
- the interleaving unit 12 rearranges the input bit series in a predetermined order and outputs it to the serial / parallel conversion unit 13.
- the serial / parallel converter 13 bundles the input bit series for each number of modulation bits of a predetermined modulation method and outputs the bundle to the symbol mapping number converter. For example, QPSK is processed every 2 bits, and 8PSK is processed every 3 bits.
- the symbol mapping number conversion unit 14 converts the input modulation bit sequence into a symbol mapping point number according to a predetermined conversion rule, and outputs the symbol mapping point number to the transmission symbol mapping point number conversion unit 16.
- a symbol mapping point conversion rule for example, MIL-STD-188-110B Appendix C performs conversion as shown in FIG.
- the scramble code generation unit 15 outputs a scramble code bit sequence having the number of bits corresponding to a predetermined modulation scheme to the transmission symbol mapping point number conversion unit 16.
- a scramble code bit sequence for example, an output according to a predetermined clipping rule of a PN (Pseudo ⁇ ⁇ random Noise) generator is used.
- the transmission symbol mapping number conversion unit 16 uses the expression 1 and the expression 2 when the symbol mapping number is N (m) and the scramble code is N SCR (m).
- the mapping number N TX (m) is calculated, and the transmission symbol mapping number N TX (m) is output to the symbol mapping unit 17.
- the symbol mapping unit 17 selects a predetermined symbol mapping point using the input transmission symbol mapping number N TX (m) and outputs the selected symbol mapping point to the modulation unit 18.
- the modulation unit 18 converts the input mapping output into a time signal, converts it into a transmission frequency, and outputs it to the transmission antenna 19.
- the transmission antenna 19 transmits the input modulation signal to the wireless transmission space.
- the reception antenna 20 receives a transmission signal from the wireless transmission space and outputs it to the detection unit 21.
- the detection unit 21 detects the input signal, converts it to a frequency signal, and outputs it to the channel equalizer 22.
- the channel equalizer 22 estimates the channel distortion between transmission and reception of the input reception frequency signal, corrects it, and outputs it to the bit LLR calculation unit 27.
- Channel equalization is Y (m) for the received signal, H ⁇ (m) for the estimated channel between transmission and reception, and X ⁇ (m) for the equalization output.
- MMSE Minimum Mean Square Error norms Is used to perform channel equalization processing.
- [ ⁇ ] H is the complex conjugate
- ⁇ 2 is the noise power.
- the reference point symbol mapping number generation unit 23 generates an integer (reference point symbol mapping number) of 0 .. Q-1 where Q is the number of mapping points that can be taken by the modulation scheme, and transmits the reference symbol transmission symbol mapping number.
- the data is output to the generation unit 25 and the bit LLR calculation unit 27.
- Number generation uses, for example, a register value, ROM read value, or counter value prepared in advance.
- the scramble code generation unit 24 has the same function as the scramble code generation unit 15, and outputs the generated scramble code bit sequence to the reference point transmission symbol mapping number generation 25.
- the reference point transmission symbol mapping number conversion unit 25 has the same function as the transmission symbol mapping number conversion unit 16, generates a reference point transmission symbol mapping number from the input reference point symbol mapping number and the scramble code bit sequence, The data is output to the reference point symbol mapping unit 26.
- the reference point symbol mapping unit 26 has the same function as the symbol mapping 17, selects a predetermined mapping point using the input reference point transmission symbol mapping number, and outputs it to the bit LLR calculation unit 27.
- the bit LLR calculation unit 27 calculates the bit likelihood using the input channel equalization output, the reference point mapping output, and the reference point symbol mapping number, and outputs the bit likelihood to the deinterleaving unit 28. Hereinafter, calculation of bit likelihood including transmission side processing and reference point generation will be described.
- FIG. 5 shows an example of a 16QAM transmission signal. This figure is an example when the symbol mapping number is 3 and the scramble code is 5. The transmission symbol mapping number is converted to 6 using Equation 2. Therefore, symbol mapping number 6 is mapped and output in this symbol.
- FIG. 6 shows a state before and after the scramble application of the reception point and the reference point transmission symbol number when the transmission signal of FIG. 5 is received.
- the reference point mapping point arrangement is the left diagram of FIG. It is obvious from the figure that the minimum distance point is 6. Therefore, when the hard decision is made, the transmission symbol mapping number of the transmission source of this received signal is 6. When 6 is descrambled, 3 is obtained, which matches the symbol mapping number of the transmission source.
- the mapping arrangement of the reference points is as shown on the right side of FIG. From the figure, it is obvious that the minimum distance point is 3. Therefore, when the hard decision is made, it is obtained that the symbol mapping number of the transmission source of this received signal is 3.
- bit LLR Log Likelihood Ratio
- the bit LLR ⁇ (m, b n ) is calculated by the following equation, for example.
- b n is the nth bit of the modulation bit of the symbol
- q is a reference point symbol mapping number
- Y R (m, q) is a reference point symbol mapping output.
- the calculation is performed using the minimum distance from 1 and the minimum distance from 0 when paying attention to each bit.
- the above method can be applied even if the mapping arrangement is a grid. Also, a known method for finding a symbol having the minimum distance more efficiently than the full search can be used.
- the bit likelihood calculation process in the present embodiment is a method of calculating the likelihood by obtaining the distance from the reference point with respect to the equalized output of the mapping arrangement that is not in a lattice shape, and the channel estimation value and the reference mapping point are calculated. This is different from MLD (Maximum Likelihood Detection), which uses this to generate a replica and calculates the distance between the received signal and the replica.
- MLD Maximum Likelihood Detection
- FIG. 7 shows a configuration of the LLR calculation unit 30 when the bit likelihood calculation process of the first embodiment is not applied for comparison.
- the LLR calculation unit 30 includes a phase rotation unit 31, bit LLR calculation units 27 a and 27 b, a code conversion unit 32, and a signal selector 33. Since the bit LLR calculation units 27a and 27b are the same as the above-described bit LLR calculation unit 27, redundant description is omitted.
- the phase rotation unit 31 outputs a signal X ⁇ ′ (m) obtained by performing phase rotation processing using the scramble code N SCR (m) to the equalized output signal X ⁇ (m) to the bit LLR calculation unit 27.
- the phase rotation is calculated as follows.
- j is an imaginary unit. This operation corresponds to descrambling in PSK.
- the bit LLR calculation unit 27b calculates a bit LLR ⁇ QAM (m, b n ) based on the input equalized output signal X ⁇ (m) based on, for example, Equation 7.
- FIG. 8 shows a distance calculation result in the bit LLR calculation process when the reception point in 16QAM of FIG. 6 is ( ⁇ 0.9, 0.3).
- the symbol whose bit is 0 and has the smallest distance, and the symbol whose bit is 1 and the distance is the smallest are selected.
- the code conversion unit 32 performs code conversion corresponding to the scramble code N SCR (m) on the bit LLR ⁇ QAM (m, b n ) input from the bit LLR calculation unit 27b, and the code converted bit LLR ⁇ ′ QAM (m, b n ) is output to the signal selector 33.
- the code conversion is performed according to the following equation.
- bitget (A, B) is a function for extracting the B-th bit when A is expressed in binary. This operation corresponds to descrambling in QAM.
- the signal selector 33 selects and outputs ⁇ PSK (m, b n ) if the modulation method is PSK. If QAM, ⁇ ′ QAM (m, b n ) is selected and output.
- FIG. 10 shows a bit LLR calculation result according to Example 1 (scramble processing of reference point symbol mapping number). It can be seen from both results that the same calculation results are obtained. When this embodiment is applied, it is not necessary to divide processing by PSK and QAM and select an output as shown in FIG.
- the deinterleaving unit 28 rearranges the input bit LLR rearranged by the interleaving unit 12 in the original arrangement order, and outputs the result to the error correction decoder 29.
- the error correction decoder 29 performs error correction decoding processing such as Viterbi algorithm decoding processing on the input bit LLR, and outputs an error correction result.
- the transmission signal scrambled to the symbol mapping number on the transmission side is received, and the reference point symbol mapping number is scrambled to generate the reference point, thereby generating a bit LLR.
- a soft decision value can be calculated.
- FIG. 11 shows the configuration of a wireless communication apparatus according to Embodiment 2 of the present invention.
- the radio communication apparatus 200 according to the second embodiment includes an error correction encoder 11, an interleaving unit 12, a serial / parallel conversion unit 13, a symbol mapping number conversion unit 14, a scramble code generation unit 15, a transmission symbol mapping number conversion unit 16, and a symbol.
- Radio transmission apparatus including mapping unit 17, modulation unit 18, and transmission antenna 19, reception antenna 20, detection unit 21, SC / MMSE filter 201, reference point symbol mapping number generation unit 23, scramble code generation unit 24, and reference point Transmission symbol mapping number generation unit 25, reference point symbol mapping unit 26, bit LLR calculation unit 27, deinterleave unit 28, soft input / soft output error correction decoder 202, hard decision unit 203, interleave unit 204, and bit probability calculation unit 205 And symbol mapping probability calculator 20 And a reference point soft symbol mapping number generation unit 207, a scramble code generation unit 208, a reference point transmission soft symbol mapping number conversion unit 209, a reference point soft symbol mapping unit 210, and a soft symbol calculation unit 211,
- the radio reception apparatus realizes iterative decoding using soft symbols (soft decision values).
- All configurations of the wireless transmission device are the same as those in the first embodiment, and are not shown. Also, among the configurations of the radio reception apparatus, apparatus reception antenna 20, detection unit 21, reference point symbol mapping number generation unit 23, scramble code generation unit 24, reference point transmission symbol mapping number generation unit 25, reference Since the point symbol mapping unit 26, the bit LLR calculation unit 27, and the deinterleaving unit 28 are the same as those in the first embodiment, description thereof will be omitted.
- the SC / MMSE filter 201 estimates a channel between transmission and reception from an input reception signal, generates a reference point of an interference component included in the reception signal from a channel estimation result and an input soft symbol, and subtracts it from the reception signal. Equalization processing based on the MMSE norm is performed, and the equalization output is output to the bit LLR calculation unit 27.
- the soft input soft output error correction decoder 202 performs soft input soft output error correction on the input bit LLR based on, for example, SOVA (Soft Output Viterbi Algorithm) or BCJR (Bahl, Cocke, Jelinek, Raviv) algorithm. Decoding is performed, and the decoding result is output to hard decision section 203 and interleaving section 204.
- SOVA Soft Output Viterbi Algorithm
- BCJR Bohl, Cocke, Jelinek, Raviv
- the hard decision unit 203 performs a hard decision such that 0 is output if the sign of the input bit LLR is positive, and 1 is output if the sign is negative, and the determination result is output.
- the interleaving unit 204 rearranges the input bit LLRs in the same order as the interleaving unit 12 and outputs the result to the bit probability calculation unit 205.
- the bit probability calculation unit 205 calculates a bit probability from the input bit LLR, and outputs the bit probability to the symbol mapping probability calculation unit 206.
- the bit probability is calculated by, for example, converting an error-corrected bit LLR to Le D (m, b n ), a bit probability of 0 being p 0 (m, b n ), and a bit probability of 1 being p When 1 (m, b n ), the following equation is used.
- the symbol mapping probability calculation unit 206 calculates the symbol mapping probability P i (m) using the input bit probabilities p 0 (m, b n ) and p 1 (m, b n ), and the soft symbol calculation unit 211 Output to.
- the symbol mapping probability calculation is based on, for example, the following equation.
- B is the number of modulation bits of the modulation scheme.
- U is calculated by the following equation.
- the reference point symbol mapping number generation unit 207 has the same function as the reference point symbol mapping point number generation unit 23.
- Q is the number of mapping points that can be taken by the modulation scheme, an integer of 0..Q-1 ( A reference point soft symbol mapping number) is generated and output to the reference point transmission soft symbol mapping number conversion unit 209.
- Number generation uses, for example, a register value, ROM read value, or counter value prepared in advance.
- the scramble code generation unit 208 has the same function as the scramble code generation unit 15 and the scramble code generation unit 24, and outputs the generated scramble code bit sequence to the reference point transmission soft symbol mapping number conversion unit 209.
- the reference point transmission soft symbol mapping number conversion unit 209 has the same functions as the transmission symbol mapping number conversion unit 16 and the reference point transmission symbol mapping number conversion unit 25, and the input reference point symbol mapping number and scramble code bit sequence From this, a reference point transmission symbol mapping number is generated and output to the reference point soft symbol mapping unit 210.
- the reference point soft symbol mapping unit 210 has the same functions as the symbol mapping 17 and the reference point symbol mapping unit 26, selects a predetermined mapping point using the input reference point transmission soft symbol mapping number, and generates a soft symbol Output to the calculation unit 211.
- the soft symbol calculation unit 211 calculates a soft symbol using the input symbol mapping probability P i (m) and the reference point symbol mapping output S q (m), and outputs the calculation result to the SC / MMSE filter unit 201.
- the calculation of the soft symbols S to (m) is based on, for example, the following equation.
- q ′ is when the modulation method is PSK, And when the modulation method is QAM, It is.
- FIG. 12 shows the configuration of soft symbol calculation when the second embodiment is not applied.
- the soft symbol calculation of FIG. 12 includes interleaving 204, code conversion unit 401, signal selector 402, bit probability calculation unit 205, symbol probability calculation unit 206, reference point symbol mapping generation unit 207, scramble code generation unit 208, and reference point symbol.
- a mapping unit 210, a soft symbol calculation unit 211, a phase rotation unit 403, and a signal selector 404 are provided.
- the interleave 204, the bit probability calculation unit 205, the symbol probability calculation unit 206, the reference point symbol mapping generation unit 207, the scramble code generation unit 208, the reference point symbol mapping unit 210, and the soft symbol calculation unit 211 are the same as those in the second embodiment. Therefore, the description is omitted.
- the code conversion unit 401 has the same function as the code conversion unit 302 and performs code conversion corresponding to the input scramble code N SCR (m) for the input bit LLR L e D (m, b ′ n ). And the sign-converted bit LLR L e ' D (m, b' n ) is output to the signal selector 402.
- Signal selector 402 the bit LLR L e D (m, b input 'n) and transcoded bit LLR L e' D (m, b 'n), the modulation scheme depending on the modulation scheme PSK If so, Le D (m, b ′ n ) is selected, and if the modulation method is QAM, L e D (m, b ′ n ) is selected and output to the bit probability calculation unit 205.
- the phase rotation unit 403 has the same function as the phase rotation unit 301, performs phase rotation according to the scramble code N SCR (m) on the input soft symbols S ⁇ ′ (m), and performs phase rotation of the software
- the symbol S ⁇ ′ ROT (m) is output to the signal selector 404.
- the signal selector 404 uses the input soft symbols S ⁇ ′ (m) and phase-rotated soft symbols S ⁇ ′ ROT (m) according to the modulation method, and if the modulation method is PSK, S ⁇ ′ ROT ( m), if the modulation method is QAM, S ⁇ '(m) is selected and output.
- the reference point symbol mapping number is scrambled.
- code conversion and phase rotation processing are required, but the present invention does not require them, and a reduction in mounting scale can be realized.
- the present invention is particularly suitable for the wireless communication system defined in MIL-STD-188-110B, but is not limited to this. It should be noted that the scope of the present invention is not limited to the illustrated and described exemplary embodiments, and includes all embodiments that provide the same effects as those intended by the present invention. Further, the scope of the present invention can be defined by any desired combination of particular features among all the disclosed features.
- the present invention can be applied to various types of wireless communication systems that perform wireless communication using white space.
- SYMBOLS 11 Error correction encoder, 12 ... Interleave part, 13 ... Serial / parallel conversion part, 14 ... Symbol mapping number conversion part, 15 ... Scramble code generation part, 16 ... Transmission symbol mapping number conversion part, 17 ... Symbol mapping part , 18 ... modulation section, 19 ... transmission antenna, 20 ... reception antenna, DESCRIPTION OF SYMBOLS 21 ... Detection part, 22 ... Channel equalization part, 23 ... Reference point symbol mapping number generation part, 24 ... Scramble code generation part, 25 ... Reference point transmission symbol mapping number generation part, 26 ... Reference point symbol mapping part, 27 ... Bit LLR calculation unit, 28 ... deinterleave unit, 29 ...
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Abstract
Description
送信部ベースバンド信号処理部において、
変調ビット系列を所定のシンボルマッピング番号に変換する手段と、
前記シンボルマッピング番号に対するスクランブルコードを生成する生成手段と、
前記スクランブルコードを用いて前記シンボルマッピング番号をスクランブル処理して送信シンボルマッピング番号へ変換する手段と、
前記送信シンボルマッピング番号と当該変調方式によりマッピングする手段と、
前記マッピングの出力を時間信号に変換して送信周波数に変換し送信する変調送信手段を備え、
受信部ベースバンド信号処理部において、
前記変調送信手段により送信された信号を受信して検波する手段と、
前記検波された信号に対してチャネル等化あるいはそれに相当する処理を行う手段と、
当該変調方式における基準点を生成するための第一の基準点シンボルマッピング番号を発生させる手段と、
前記スクランブルコードを用いて前記第一の基準点シンボルマッピング番号をスクランブル処理して第一の基準点送信シンボルマッピング番号へ変換する手段と、
前記第一の基準点送信シンボルマッピング番号と当該変調方式によりマッピングする第一の基準点マッピング手段と、
前記第一の基準点マッピング手段からの出力と前記チャネル等化出力との距離を算出する手段と、
前記第一の基準点シンボルマッピング番号と前記距離を参照してビット尤度を算出する手段と、を備えた。
送信側において、
変調ビット系列を所定のシンボルマッピング番号に変換し、
前記シンボルマッピング番号に対するスクランブルコードを生成し、
前記スクランブルコードを用いて前記シンボルマッピング番号をスクランブル処理して送信シンボルマッピング番号へ変換し、
前記送信シンボルマッピング番号と当該変調方式によりマッピングし、
前記マッピングの出力を時間信号に変換して送信周波数に変換し送信し、
受信側において、
前記送信された信号を受信して検波し、
前記検波された信号に対してチャネル等化あるいはそれに相当する処理を行い、
当該変調方式における基準点を生成するための第一の基準点シンボルマッピング番号を発生し、
前記スクランブルコードを用いて前記第一の基準点シンボルマッピング番号をスクランブル処理して第一の基準点送信シンボルマッピング番号へ変換し、
前記第一の基準点送信シンボルマッピング番号と当該変調方式によりマッピングし、
前記マッピングの出力と前記チャネル等化出力との距離を算出し、
前記第一の基準点シンボルマッピング番号と前記距離を参照してビット尤度を算出する。
図8は、図6の16QAMにおける受信点を(-0.9,0.3)とした場合の、ビットLLR計算の過程における距離計算結果である。各ビットのLLRを求めるにあたり、そのビットが0になるようなシンボルであって距離が最小のものと、そのビットが1になるようなシンボルであって距離が最小のもの(本例では、シンボルマッピング番号6、7、14)が選ばれる。
また、無線受信装置の構成の内、装置受信アンテナ20と、検波部21と、基準点シンボルマッピング番号生成部23と、スクランブルコード生成部24と、基準点送信シンボルマッピング番号生成部25と、基準点シンボルマッピング部26と、ビットLLR算出部27と、デインタリーブ部28は、実施例1と同一であるので、説明は省略する。
なお、本発明の範囲は、図示され記載された例示的な実施形態に限定されるものではなく、本発明が目的とするものと同様な効果をもたらす全ての実施形態をも含む。更に、本発明の範囲は、全ての開示されたそれぞれの特徴のうち特定の特徴のあらゆる所望する組み合わせによって画されうる。
21…検波部、 22…チャネル等化部、 23…基準点シンボルマッピング番号生成部、 24…スクランブルコード生成部、 25…基準点送信シンボルマッピング番号生成部、 26…基準点シンボルマッピング部、 27…ビットLLR算出部、 28…デインタリーブ部、 29…誤り訂正復号器、
201…ソフト干渉キャンセラ/MMSE等化部、 202…軟入力軟出力誤り訂正復号器、 203硬判定部、 204…インタリーブ部、 205…ビット確率計算部、 206…シンボル確率計算部、 207…基準点シンボルマッピング番号生成部、 208…スクランブルコード生成部、 209…基準点送信シンボルマッピング番号変換部、
210…基準点シンボルマッピング部、 211…ソフトシンボル計算部、
301…位相回転部、 302…符号変換部、 303…信号選択器、
401…符号変換部、 402…信号選択器、 403…位相回転部、 404…信号選択器。
Claims (3)
- 送信部ベースバンド信号処理部において、
変調ビット系列を所定のシンボルマッピング番号に変換する手段と、
前記シンボルマッピング番号に対するスクランブルコードを生成する生成手段と、
前記スクランブルコードを用いて前記シンボルマッピング番号をスクランブル処理して送信シンボルマッピング番号へ変換する手段と、
前記送信シンボルマッピング番号と当該変調方式によりマッピングする手段と、
前記マッピングの出力を時間信号に変換して送信周波数に変換し送信する変調送信手段を備え、
受信部ベースバンド信号処理部において、
前記変調送信手段により送信された信号を受信して検波する手段と、
前記検波された信号に対してチャネル等化あるいはそれに相当する処理を行う手段と、
当該変調方式における基準点を生成するための第一の基準点シンボルマッピング番号を発生させる手段と、
前記スクランブルコードを用いて前記第一の基準点シンボルマッピング番号をスクランブル処理して第一の基準点送信シンボルマッピング番号へ変換する手段と、
前記第一の基準点送信シンボルマッピング番号と当該変調方式によりマッピングする第一の基準点マッピング手段と、
前記第一の基準点マッピング手段からの出力と前記チャネル等化出力との距離を算出する手段と、
前記第一の基準点シンボルマッピング番号と前記距離を参照してビット尤度を算出する手段と、を備える無線通信装置。 - 請求項1記載の無線通信装置において、前記送信部ベースバンド信号処理部に誤り訂正符号化処理を備え、前記誤り訂正符号化された信号に対してインタリーブ処理して前記シンボルマッピング番号変換手段に出力する第一のインタリーブ手段を備え、前記受信部ベースバンド信号処理部において、前記ビット尤度をデインタリーブ処理する手段を備え、前記デインタリーブ処理した信号を軟入力軟出力誤り訂正復号する処理を備え、前記軟入力軟出力誤り訂正復号出力に対して前記第一のインタリーブ手段と同じインタリーブパターンの第二のインタリーブ手段を備え、前記第二のインタリーブ手段出力のビット尤度をビット確率に変換する手段を備え、前記ビット確率を当該変調方式に基づきシンボルマッピング確率を算出する手段を備え、ソフトシンボル計算用の第二の基準点シンボルマッピング番号を生成する手段を備え、前記第二の基準点シンボルマッピング番号に対し前記スクランブルコード用いて第二の基準点送信シンボルマッピング番号を生成する手段を備え、前記第二の基準点送信シンボルマッピング番号と当該変調方式によりマッピングする第二の基準点マッピング手段を備え、前記シンボルマッピング確率算出手段出力と前記第二の基準点マッピング手段出力からソフトシンボルを算出する手段を備え、前記ソフトシンボル算出手段出力を前記チャネル等化手段にフィードバックするターボ等化手段を備えることを特徴とする無線通信装置。
- 送信側において、
変調ビット系列を所定のシンボルマッピング番号に変換し、
前記シンボルマッピング番号に対するスクランブルコードを生成し、
前記スクランブルコードを用いて前記シンボルマッピング番号をスクランブル処理して送信シンボルマッピング番号へ変換し、
前記送信シンボルマッピング番号と当該変調方式によりマッピングし、
前記マッピングの出力を時間信号に変換して送信周波数に変換し送信し、
受信側において、
前記送信された信号を受信して検波し、
前記検波された信号に対してチャネル等化あるいはそれに相当する処理を行い、
当該変調方式における基準点を生成するための第一の基準点シンボルマッピング番号を発生し、
前記スクランブルコードを用いて前記第一の基準点シンボルマッピング番号をスクランブル処理して第一の基準点送信シンボルマッピング番号へ変換し、
前記第一の基準点送信シンボルマッピング番号と当該変調方式によりマッピングし、
前記マッピングの出力と前記チャネル等化出力との距離を算出し、
前記第一の基準点シンボルマッピング番号と前記距離を参照してビット尤度を算出する、ことを特徴とする無線通信方法。
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