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Performance of M-ary QAM demapper with Max-Log-MAP  

Lee Sang-Keun (청강문화산업대학 이동통신과)
Lee Yun-Hyun (한국항공대학교 전자 정보통신 컴퓨터공학부)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.10, no.1, 2006 , pp. 36-41 More about this Journal
Abstract
In this paper, we present the performance of iterative decoding with a Turbo decoder and a M-ary QAM(Quadrature Amplitude Modulation) demapper. The demappers are designed with Max-Log-MAP algorithm and it's approximated one. In addition, we provide implementing block for the approximated algorithm. From the results of computer simulations, the approximated algorithm of the Max-Log-MAP has little bit worse than the Max-Log-MAP but suggests low complexity for practical implementation.
Keywords
Log likelihood ratio; QAM; demapper; Max-log-MAP;
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