Research on the High Symbol Rate ISI Transmission and the Detection/Decoding Algorithm of the Coded ISI System
Daoben Li · Beijing Youdian Xueyuan xuebao · 2007
The performance of the high symbol rate intersymbol interference(ISI) transmission with maximum likelihood sequence detection(MLSD) utilized at receiver is researched.Compared with the Mary-quadrature amplitude modulation(M-QAM) non-ISI system that has the same spectral efficiency,the bit error rate performance of the ISI system outperforms gradually with the spectral efficiency increasing.The optimal algorithm of the coded ISI system is proposed that is iteratively soft-in soft-out joint detection and decoding under maximum a posterior(MAP) criterion.Simulation shows that optimal algorithm obtains the optimal coding gain for it fully utilizing the encoding constraints formed by ISI.