编码16DAPSK 信号解调译码新方法
A Novel Demodulation Decoding Method for Coded 16DAPSK Signals
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摘要: 基于子载波采用16阶差分幅度相移键控(16DAPSK)的正交频分复用(OFDM)系统，提出并分析了编码16DAPSK信号的一种新的简单易行的比特软输出解调译码方法。仿真结果表明，在高斯信道、平坦Rayleigh衰落信道和多径Rayleigh衰落信道下，采用编码速率为3/4的punctured卷积码与16DAPSK信号的硬输出解调译码方法相比，系统的误码性能可改善约1.2dB。新方法应用在日本CRL开发的100Mbps毫米波16DAPSK-OFDM宽带移动接入实验系统，将进一步提高系统误码性能。Abstract: An OFDM system with 16DAPSK modulation for each subcarrier is considered. In this paper, a novel bit soft-output demodulation decoding scheme which is simpler to implement for coded 16DAPSK signal is proposed and investigated. The simulation results show that about 1.2dB performance gain can be achieved in AWGN, flat Rayleigh fading, and multipath Rayleigh fading channels with forward error correct coding (rate 3/4, punctured convolutional coding) compared with hard-decision decoding. The Bit-Error-Rate (BER) will be reduced if this method is applied in 100Mbps 16DAPSK-OFDM millimeter-wave broadband mobile access experimental system developed by CRL in Japan.
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