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Soft decision for Gray Coded PAM Signals Using Max-Log-MAP  

Hyun, Kwang-Min (국립원주대학 정보통신과)
Yoon, Dong-Weon (한양대학교 전자통신컴퓨터공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.2C, 2006 , pp. 117-122 More about this Journal
Abstract
In this paper, we present a simple and general soft bit decision expression for a Gray coded PAM signal over additive white Gaussian noise(AWGN) channel with the log likelihood ratio(LLR). In order to reduce the complexity of the LLR calculation, we make the bitwise LLR expression simple by replacing the mathematical max functions of the conventional Max-Log-MAP expression with simple arithmetic functions associated with some deterministic parameters, such as a received value and distance between symbols on a signal space. Taking the implementation issues, like the area of silicon, the power consumption, the timing latency, and so on, into consideration, we submit that the proposed method is a promising alternative way to conventional methods for reconfigurable systems.
Keywords
Soft Decision; Max-log-MAP; PAM; Log Likelihood; QAM;
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