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Dual binary turbo code decoding method based on adaptive principle

A dual-binary, self-adaptive technology, applied in the field of decoding, can solve problems such as high complexity, loss of decoding performance, and low decoding complexity

Inactive Publication Date: 2006-03-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Among them, the Log-MAP algorithm has better decoding performance, but due to the existence of many exponential logarithmic operations, the complexity is relatively high; correspondingly, the Max-log-MAP algorithm completely avoids complex exponential logarithmic operations, and replaces them with simple Addition, subtraction, and maximum value calculations have low decoding complexity, which is conducive to hardware implementation. However, this reduction in complexity comes at the expense of decoding performance loss.

Method used

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  • Dual binary turbo code decoding method based on adaptive principle
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Embodiment

[0017] Concrete steps of the present invention are as follows:

[0018] 1) Iterative decoding starts, and the parameters are set as follows iter=0, method=2, T=30, T -1 =0 (iter represents the number of iterations, method represents which decoding algorithm is used, method=1 represents the Log-MAP algorithm, method=2 represents the Max-log-MAP algorithm; T iter Represents the conditional judgment value of the termination iteration criterion based on the information bit posterior logarithmic ratio, and its specific expression is as follows:

[0019] T iter = min 1 ≤ k ≤ N iter { | L 1 ( u k ) | + | L 2 (...

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Abstract

The method is applicable to technical area of communication. Using criterion for ending iteration based on posteriori log likelihood ratio of information bits in dual binary Turbo code, the method compares value of conditional judgment of the criterion in this iteration with value of previous iteration. If the value of conditional judgment of this iteration is larger than the value of previous iteration, then Max-log-MAP algorithm will be used for next iteration; otherwise, Log-MAP algorithm will be used for next iteration. The invention combines criterion for ending iteration based on posteriori log likelihood ratio of information bits in dual binary Turbo code with self-adapting principle. Thus, decoding performance of the method is close to Log-MAP algorithm, and decoding complexity is equivalent to Max-log-MAP algorithm. The method is a compromise between decoding performance and decoding complexity. The method is in favor of realization of hardware.

Description

technical field [0001] The present invention relates to a decoding method used in the technical field of communication, in particular, a double binary Turbo code decoding method based on the principle of self-adaptation. Background technique [0002] Dual binary turbo code is one of the forward error correction code schemes adopted in the physical layer of multi-carrier OFDM system in the 802.16d standard supporting Wireless Metropolitan Area Network (WMAN). Compared with classical turbo codes, dual binary turbo codes have the advantages of high coding efficiency, good error correction performance under the same complexity decoder, small decoding delay and no error floor. The dual binary Turbo code uses a cyclic recursive systematic convolutional code as a subcode. It does not require a "tail bit" to make each packet have the same start state and end state. This same state is called the cyclic state S C . Before the actual encoding, the cyclic state S must be found through...

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Application Information

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IPC IPC(8): H03M13/29H03M13/03
Inventor 张乐李俊徐友云张海滨
Owner SHANGHAI JIAO TONG UNIV