| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 99 === In this paper, we study a turbo code decoder for 3GPP Long Term Evolution (LTE) system. We use Maximum A Posteriori Probability (MAP), Log-MAP and MAX-Log-MAP algorithm for turbo code decoding, under AWGN channel and fading channel. After channel decoding, we realize that MAP and Log-MAP has the same performance better than Max-Log-MAP, but Max-Log-MAP algorithm reduce more complexity than MAP and Log-MAP algorithm. If turbo code decoding cannot get SNR information, we use SNR estimation to solve SNR unknown. Furthermore, we consider if fading amplitude unknown, what situation will occur under fading channel.
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