SNR Mismatch and Robust Schemes in MAP-based Iterative Detection System with CPM
In this paper, two MAP-based demodulation algo-rithmsof CPM modulation scheme are studied. It is shown thatthese algorithms have almost the same demodulation perfor-manceas Maximum Likelihood Sequence Estimation (MLSE)over AWGN channels. However, for the concatenated systemfollowed by a convolutional encoder, the performance of iter-ativedemodulation and decoding using the two demodulationalgorithms are widely different. Again, their effects of SNR mis-matchon iterative detection scheme are investigated respectively.Simulations show that the optimum MAP detection algorithmis sensitive to SNR estimation errors. Finally, a new iterativedetection method is proposed which is not only insensitive toSNR mismatch, but also makes a tradeoff between the BERperformance and the robustness to SNR offset. The validity ofour way is proved by simulation results.
Li Qiang Shaoqian Li
National Key Lab of Communication University of Electronic Science and Technology of China Chengdu,610054,P.R.China
国际会议
2007年通信、电路与系统国际会议(2007 International Conference on Communications,Circuits and Systems Proceedings)
日本福冈
英文
2007-07-11（万方平台首次上网日期，不代表论文的发表时间）