IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0087179
(2005-12-26)
|
등록번호 |
US-8209579
(2012-06-26)
|
국제출원번호 |
PCT/RU2005/000668
(2005-12-26)
|
§371/§102 date |
20090224
(20090224)
|
국제공개번호 |
WO2007/075098
(2007-07-05)
|
발명자
/ 주소 |
- Belogolovy, Andrey Vladimirovich
|
출원인 / 주소 |
|
대리인 / 주소 |
Schwegman, Lundberg & Woessner, P.A.
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
23 |
초록
▼
Methods, apparatus, and systems are provided for error correction of a communication signal. A generalized multiple threshold scheme for iteratively decoding a received codeword may include generating a bit reliability based on a channel output reliability and an updated bit reliability from a previ
Methods, apparatus, and systems are provided for error correction of a communication signal. A generalized multiple threshold scheme for iteratively decoding a received codeword may include generating a bit reliability based on a channel output reliability and an updated bit reliability from a previous decoding iteration, where the bit reliability is updated using a scaling factor and a comparison with a threshold. The threshold may have a plurality of threshold values during the iterative decoding.
대표청구항
▼
1. A method comprising: operating a decoder using a processor to perform operations to decode a codeword received from a communication channel, the operations including generating a bit reliability to iteratively decode a received codeword including generating the bit reliability based on a summatio
1. A method comprising: operating a decoder using a processor to perform operations to decode a codeword received from a communication channel, the operations including generating a bit reliability to iteratively decode a received codeword including generating the bit reliability based on a summation, the summation including a channel output reliability and an updated bit reliability from a previous decoding iteration, such that for each iteration the bit reliability is updated using a scaling factor with respect to the bit reliability from the previous decoding iteration and a comparison with a threshold, wherein the threshold has a plurality of threshold values during the iterative decoding. 2. The method of claim 1, wherein the method includes selecting the scaling factor based on a predetermined low-density parity check code construction. 3. The method of claim 1, wherein the method includes correcting one or more bits of a test codeword based on a comparison of the updated bit reliability with the threshold to provide a valid codeword, the test codeword initially generated from the received codeword. 4. The method of claim 1, wherein the method includes applying a channel scale factor to generate the channel output reliability to update the bit reliability, the channel scale factor being less than the scaling factor. 5. The method of claim 1, wherein the method includes: performing a soft decision process on each bit of the received codeword to generate a received vector from which a hard decision vector and bit reliabilities are generated;calculating parity-check reliabilities using the bit reliabilities;recalculating the bit reliabilities adjusted by the scaling factor; andcalculating a value for the threshold. 6. The method of claim 1, wherein the method includes acquiring the plurality of threshold values as predetermined values generated based on a communication channel parameter. 7. The method of claim 1, wherein the method includes acquiring the plurality of threshold values form a set of predetermined values generated based on one or more low-density parity check code constructions. 8. The method of claim 1, wherein the scale factor includes a value in the range from 0.68 to 0.85. 9. The method of claim 1, wherein iteratively decoding a received codeword includes limiting the iteration to a number of iterations, the number of iterations equal to log2 n, where n is a code length of the codeword. 10. The method of claim 1, where using the comparison with the threshold includes using a threshold value computed by setting the threshold to a value selected from a set of updated bit reliabilities in a decoding activity correlated to decoding the codeword received from the communication channel, the threshold value used to decide whether the bit and its reliability should be updated. 11. A non-transitory machine-readable medium that stores instructions, which when performed by a machine, cause the machine to: operate a decoder using a processor to perform operations to decode a codeword received from a communication channel, the operations including operations to generate a bit reliability to iteratively decode a received codeword, the generated bit reliability based on a channel output reliability and an updated bit reliability from a previous decoding iteration such that for each iteration the bit reliability is updated using a scaling factor and a comparison with a threshold, wherein the threshold has a plurality of threshold values during the iterative decoding, generating a bit reliability to iteratively decode a received codeword including generating the bit reliability based on a summation, the summation including a channel output reliability and an updated bit reliability from a previous decoding iteration, such that for each iteration the bit reliability is updated using a scaling factor with respect to the bit reliability from the previous decoding iteration and a comparison with a threshold, wherein the threshold has a plurality of threshold values during the iterative decoding. 12. The non-transitory machine-readable medium of claim 11, wherein the instructions include instructions to correct one or more bits of a test codeword initially generated from the received codeword to provide a valid codeword. 13. The non-transitory machine-readable medium of claim 11, wherein the instructions include instructions to provide a message word from the received codeword after iteratively decoding the received codeword. 14. The non-transitory machine-readable medium of claim 11, wherein the instructions include instructions to: perform a soft decision process on each bit of the received codeword to generate a received vector from which a hard decision vector and bit reliabilities are generated;calculate parity-check reliabilities using the bit reliabilities;recalculate the bit reliabilities adjusted by the scaling factor; andcalculate a value for the threshold. 15. The non-transitory machine-readable medium of claim 11, wherein the instructions include instructions to acquire the plurality of threshold values form a set of predetermined values generated based on one or more low-density parity check code constructions. 16. The non-transitory machine-readable medium of claim 11, wherein the scale factor includes a value in the range from 0.68 to 0.85. 17. An apparatus comprising: a processor;a decoder arranged with the processor to iteratively decode a received codeword from a communication channel, the decoder including: a bit reliability generator to provide a set of bit reliabilities, each bit reliability corresponding to a bit of a received codeword acquired by the receiver; anda comparison unit using a threshold such that, for each iteration of an iterative process to decode the received codeword, the bit reliability is updated based on a summation, the summation including a channel output reliability and a bit reliability from a previous decoding iteration, such that for each iteration the bit reliability is updated using a scaling factor with respect to the bit reliability from the previous decoding iteration and a comparison with the threshold, wherein the threshold has a plurality of threshold values during the iterative decoding. 18. The apparatus of claim 17, wherein the apparatus includes a threshold unit to store the plurality of threshold values as predetermined values generated based on a communication channel parameter. 19. The apparatus of claim 17, wherein the apparatus includes a threshold unit to store the plurality of threshold values as predetermined values generated based on one or more low-density parity check code constructions. 20. The apparatus of claim 17, wherein the scale factor includes a value in the range from 0.68 to 0.85. 21. The apparatus of claim 17, wherein the apparatus includes a 10G Base-T network card in which the decoder is disposed. 22. The apparatus of claim 17, where the plurality of threshold values includes a threshold value selected from a set of updated bit reliabilities in a decoding activity correlated to the decode of the received codeword. 23. A system comprising: a controller;a parallel bus; anda decoder communicatively coupled to the controller through the parallel bus, the decoder to iteratively decode a received codeword, the decoder including: a bit reliability generator to provide a set of bit reliabilities, each bit reliability corresponding to a bit of a received codeword acquired by the receiver; anda comparison unit using a threshold such that, for each iteration of an iterative process to decode the received codeword, the bit reliability is updated based on a summation, the summation including a channel output reliability and a bit reliability from a previous decoding iteration, such that for each iteration the bit reliability is updated using a scaling factor with respect to the bit reliability from the previous decoding iteration and a comparison with the threshold, wherein the threshold has a plurality of threshold values during the iterative decoding. 24. The system of claim 23, wherein the system includes a machine-readable medium that stores instructions, which when performed by the system, cause the system to control the decoder to iteratively decode the received codeword. 25. The system of claim 24, wherein the instructions include instructions to generate the plurality of threshold values. 26. The system of claim 23, wherein the system includes memory to store the plurality of threshold values as predetermined values generated based on a communication channel parameter. 27. The system of claim 23, wherein the system includes a threshold unit to store the plurality of threshold values as predetermined values generated based on one or more low-density parity check code constructions. 28. The system of claim 23, wherein the scale factor includes a value in the range from 0.68 to 0.85. 29. The system of claim 23, wherein the system includes memory to store multiple values of the scale factor. 30. The system of claim 23, wherein the network interface card includes a 10GBase-T network card. 31. The system of claim 23, wherein the decoder includes an output to provide a codeword decoded from a received low-density parity check code.
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