IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0536146
(2012-06-28)
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등록번호 |
US-8671321
(2014-03-11)
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발명자
/ 주소 |
- Liberg, Olof
- Lopez, Miguel
- Das, Sajal Kumar
- Sundberg, Mårten
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출원인 / 주소 |
- Telefonaktiebolaget L M Ericsson (Publ)
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대리인 / 주소 |
Murphy, Bilak & Homiller, PLLC
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인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
A method and apparatus for retransmission processing in a communication receiver includes improving the performance of Incremental Redundancy (IR) combining and retransmission processing at minimal increased complexity. One aspect of these improvements involves the use of prior decoding results, if
A method and apparatus for retransmission processing in a communication receiver includes improving the performance of Incremental Redundancy (IR) combining and retransmission processing at minimal increased complexity. One aspect of these improvements involves the use of prior decoding results, if the decoding block quality is above a threshold value, rather than or in addition to prior demodulation results, in retransmission processing. That is, the teachings herein propose selectively using the hard bit decisions obtained from decoding previously transmitted data blocks, to improve the decoding of retransmitted data blocks.
대표청구항
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1. A method of retransmission processing in a communication receiver comprising: obtaining second soft bits by demodulating a second data block received as a retransmission of an earlier-received first data block that was unsuccessfully decoded by the receiver;evaluating whether the first data block
1. A method of retransmission processing in a communication receiver comprising: obtaining second soft bits by demodulating a second data block received as a retransmission of an earlier-received first data block that was unsuccessfully decoded by the receiver;evaluating whether the first data block satisfies a block quality target;if the first data block satisfies the block quality target, using a first type of soft combining to obtain combined demodulation results for decoding, said first type of soft combining including forming the combined demodulation results by combining the second soft bits with regenerated soft bits that were obtained by transforming first hard bits into said regenerated soft bits, wherein the first hard bits comprise decoding results obtained by decoding first soft bits that were obtained by demodulating the first data block;if the first data block does not satisfy the block quality target, using a second type of soft combining to obtain the combined demodulation results, said second type of soft combining including forming the combined demodulation results without use of the regenerated soft bits; anddecoding the combined demodulation results in an attempt to correctly recover information bits encoded in the first and second data blocks. 2. The method of claim 1, wherein, for the second type of soft combining, forming the combined demodulation results without use of the regenerated soft bits comprises forming the combined demodulation results as a function of the first and second soft bits, but not as a function of the regenerated soft bits. 3. The method of claim 1, further comprising determining whether the first data block meets the block quality target by evaluating a correspondence between the first soft bits and the first hard bits. 4. The method of claim 3, wherein evaluating the correspondence between the first soft bits and the first hard bits comprises one of: comparing sign values of the first soft bits with corresponding sign values of the regenerated soft bits, wherein a greater number of matching sign values indicates a higher block quality for the first data block; orcomparing bit values of the first hard bits to bit values of converted hard bits obtained by making hard decisions on the first soft bits, wherein a greater number of matching bit values indicates a higher block quality for the first data block. 5. The method of claim 1, wherein forming the combined demodulation results when using the first type of soft combining comprises forming them according to a function that weights the regenerated soft bits according to signal quality, wherein a lower signal quality results in less weighting of the regenerated soft bits in forming the combined demodulation results and a higher signal quality results in more weighting of the regenerated soft bits in forming the combined demodulation results. 6. The method of claim 1, wherein transforming the first hard bits into the regenerated soft bits comprises forming each regenerated soft bit as a sign determined by the binary value of the corresponding first hard bit and a magnitude that is set to a low-confidence value if the corresponding first hard bit corresponds to a punctured bit position in the first data block and that is set to a high-confidence value if the corresponding first hard bit corresponds to a non-punctured bit position in the first data block. 7. The method of claim 1, wherein transforming the first hard bits into the regenerated soft bits comprises forming a set of soft bits comprising, for each non-punctured bit position, the corresponding first soft bit, and, for each punctured bit position, the corresponding one of the soft values obtained by converting the first hard bits, after re-encoding, into said soft values. 8. The method of claim 1, further comprising, when using the first type of soft combining, forming the combined demodulation results by adding each second soft bit to the corresponding regenerated soft bit. 9. The method of claim 1, wherein the receiver comprises a GSM receiver, and further comprising receiving the first and second data blocks in a GSM/EDGE signal, as part of an incremental redundancy (IR), or chase combining, retransmission scheme. 10. The method of claim 1, further comprising determining whether the first data block satisfies a block quality target based on evaluating a Received Signal Strength Indicator (RSSI). 11. The method of claim 1, wherein transforming the first hard bits into the regenerated soft bits comprises weighting each first hard bit with a confidence weighting value that sets a confidence level of the resulting transformed soft bit, and combining the transformed soft bits with respective ones of the first soft bits to obtain the regenerated soft bits. 12. A communication receiver configured to perform retransmission processing and comprising one or more processing circuits configured to: obtain second soft bits by demodulating a second data block received as a retransmission of an earlier-received first data block that was unsuccessfully decoded by the receiver;evaluate whether the first data block satisfies a block quality target;if the first data block meets the block quality target, use a first type of soft combining to obtain combined demodulation results for decoding, said first type of soft combining including forming the combined demodulation results by combining the second soft bits with regenerated soft bits that were obtained by transforming first hard bits into said regenerated soft bits, wherein the first hard bits comprise decoding results obtained by decoding first soft bits that were obtained by demodulating the first data block;if the first data block does not satisfy the block quality target, use a second type of soft combining to obtain the combined demodulation results, said second type of soft combining including forming the combined demodulation results without use of the regenerated soft bits; anddecode the combined demodulation results in an attempt to correctly recover information bits encoded in the first and second data blocks. 13. The receiver of claim 12, wherein the one or more processing circuits comprise: a demodulation circuit that is configured to demodulate the first and second data blocks, to obtain the first and second soft bits, respectively;a decoding circuit that is configured to decode the first soft bits to obtain the first hard bits, and to decode the combined demodulation results; anda retransmission processing circuit configured to evaluate whether the first data block meets the block quality target and to correspondingly control whether the regenerated soft bits are used in forming the combined demodulation results, based on selecting either the first or the second type of soft combining. 14. The receiver of claim 12, wherein, for the second type of soft combining, the one or more processing circuits are configured to form the combined demodulation results without use of the regenerated soft bits by forming the combined demodulation results as a function of the first and second soft bits, but not as a function of the regenerated soft bits. 15. The receiver of claim 12, wherein the one or more processing circuits are configured to determine whether the first data block meets the block quality target by evaluating a correspondence between the first soft bits and the first hard bits. 16. The receiver of claim 15, wherein the one or more processing circuits are configured to evaluate the correspondence between the first soft bits and the first hard bits based on being configured to: compare sign values of the first soft bits with corresponding sign values of the regenerated soft bits, wherein a greater number of matching sign values indicates a higher block quality for the first data block; orcompare bit values of the first hard bits to bit values of converted hard bits obtained by making hard decisions on the first soft bits, wherein a greater number of matching bit values indicates a higher block quality for the first data block. 17. The receiver of claim 12, wherein the one or more processing circuits are configured to transform the first hard bits into the regenerated soft bits by forming a set of soft bits comprising, for each non-punctured bit position, the corresponding first soft bit, and, for each punctured bit position, the corresponding one of the soft values obtained by converting the first hard bits, after re-encoding, into said soft values. 18. The receiver of claim 12, wherein, when using the first type of soft combining, the one or more processing circuits are configured to form the combined demodulation results according to a function that weights the regenerated soft bits according to signal quality, wherein a lower signal quality results in less weighting of the regenerated soft bits in forming the combined demodulation results and a higher signal quality results in more weighting of the regenerated soft bits in forming the combined demodulation results. 19. The receiver of claim 12, wherein the one or more processing circuits are configured to transform the first hard bits into the regenerated soft bits based on forming each regenerated soft bit as a sign determined by the binary value of the corresponding first hard bit and a magnitude that is set to a low-confidence value if the corresponding first hard bit corresponds to a punctured bit position in the first data block and that is set to a high-confidence value if the corresponding first hard bit corresponds to a non-punctured bit position in the first data block. 20. The receiver of claim 12, wherein, when using the first type of soft combining, the one or more processing circuits are configured to form the combined demodulation results by adding each second soft bit to the corresponding regenerated soft bit. 21. The receiver of claim 12, wherein the receiver comprises a GSM receiver that is configured to receive the first and second data blocks in a GSM/EDGE signal, as part of an incremental redundancy (IR), or chase combining, retransmission scheme. 22. The receiver of claim 12, wherein the one or more processing circuits are configured to determine whether the first data block satisfies a block quality target based on evaluating a Received Signal Strength Indicator (RSSI). 23. The receiver of claim 12, wherein the one or more processing circuits are configured to transform the first hard bits into the regenerated soft bits by weighting each first hard bit with a confidence weighting value that sets confidence level of the resulting transformed soft bit, and combining the transformed soft bits with respective ones of the first soft bits to obtain respective ones of the regenerated soft bits. 24. A wireless communication apparatus comprising a communication receiver configured to perform retransmission processing and comprising one or more processing circuits configured to: obtain second soft bits by demodulating a second data block received as a retransmission of an earlier-received first data block that was unsuccessfully decoded by the receiver;evaluate whether the first data block satisfies a block quality target;if the first data block meets the block quality target, use a first type of soft combining to obtain combined demodulation results for decoding, said first type of soft combining including forming the combined demodulation results by combining the second soft bits with regenerated soft bits that were obtained by transforming first hard bits into said regenerated soft bits, wherein the first hard bits comprise decoding results obtained by decoding first soft bits that were obtained by demodulating the first data block;if the first data block does not satisfy the block quality target, use a second type of soft combining to obtain the combined demodulation results, said second type of soft combining including forming the combined demodulation results without use of the regenerated soft bits; anddecode the combined demodulation results in an attempt to correctly recover information bits encoded in the first and second data blocks.
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