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Log-MAP decoding method and decoder

A decoder and decoding technology, which is applied in the field of Turbo code decoding, can solve the problems of high complexity of the Log-MAP algorithm, long operation time, and difficulties in hardware implementation and application of the Log-MAP algorithm, so as to simplify the Log-MAP algorithm. MAP algorithm, the effect of low computational complexity

Inactive Publication Date: 2014-01-22
LEADCORE TECH
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Problems solved by technology

[0105] The Log-MAP algorithm greatly simplifies the MAP algorithm, but due to max * For the existence of ( ) operator, for the formula (31), the complexity of the Log-MAP algorithm is still high, and the calculation time is relatively large, which is the biggest difficulty in the hardware implementation and application of the Log-MAP algorithm

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[0148] figure 1 A coding structure of a Turbo code is shown, which includes an interleaver 101 , a first component encoder 102 , a second component encoder 103 , and a multiplexer 104 . Such as figure 1 As shown, the Turbo code encoding process is as follows: On the one hand, the information sequence {u k} first as the system outputs {X s} directly into the multiplexer 104, and at the same time into the first component encoder for encoding to obtain the check sequence {X 1p}. On the other hand, the information sequence {u k} is also sent to the interleaver 101 to obtain the interleaved sequence new sequence Send it to the second component encoder 103 for encoding to obtain the check sequence {X 2p}. In order to improve the code rate of the Turbo code, the output X of the two component encoders can also be 1p and x 2p After puncturing matrix processing, some check digits are deleted to obtain the check sequence X p , followed by X s and x p They are sent to the m...

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Abstract

The invention relates to a Log-MAP decoding method and decoder. According to the Log-MAP decoding method and decoder, a simplified Log-MAP algorithm is used so that under a condition that an algorithm complexity is reduced, decoding performance close to the Log-MAP algorithm is still maintained. In the Log-MAP decoding method, max*() is used to calculate a forward metric, a backward metric and a log-likelihood ratio, wherein with respect to an operation expression: Max * (x, y) = ln (e<x>+e<y>) = max (x, y) +ln (1+e<-|x-y|>), a piecewise-approximation fitting function is used to approximately substitute a correlation function ln (1+e<-|x-y|>).

Description

technical field [0001] The present invention relates to Turbo code decoding used in LTE (Long Term Evolution, Long Term Evolution) / LTE-A (LTE-Advanced) next-generation mobile communication system, in particular to a Log-MAP decoding method and a decoder. Background technique [0002] At present, due to the high coding efficiency of Turbo codes and the potential to approach the Shannon limit, LTE / LTE-A mainly uses Turbo codes for coding. But at the same time of high-speed encoding, it brings contradictions and problems between high throughput rate, bit error rate and delay. MAP algorithm is a main method of Turbo code decoding, and its improved algorithm includes Log-MAP algorithm and MAX-LOG-MAP algorithm. [0003] The MAP decoding algorithm is a soft output decoding algorithm based on the maximum a posteriori probability. Its basic idea is to calculate the posterior probability of each state transition, message bit and coded symbol of the Markov process given the received ...

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Application Information

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IPC IPC(8): H03M13/45H03M13/29
Inventor 郑华晋陶玥琛宋春林
Owner LEADCORE TECH
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