Noncoherent detection of DQPSK in OFDM systems using predictive VA

2016 International Conference on Communication, Image and Signal Processing

物理学;无线电电子学;计算机科学

Veludandi, Vineel K.^1 ; Vasudevan, K.^1

Department of Electrical Engineering, IIT Kanpur, Kanpur

208016, India^1

关键词: Differential quaternary phase shift keying;    High SNR;    M-ary PSK;    Noise variance;    Noncoherent detection;    OFDM systems;    Prediction filter;    Training symbols;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/787/1/012024/pdf
DOI  :  10.1088/1742-6596/787/1/012024

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Noncoherent detection of differential quaternary phase shift keying (DQPSK) signals in OFDM systems is efficiently implemented using a predictive Viterbi algorithm (VA) operating on a trellis with just ST= MP-1states instead of MPstates, where M denotes an M-ary PSK constellation and P denotes the order of the prediction filter. The prediction filter coefficients are generated based on the channel DFT alone making a high SNR approximation, since the estimation of the noise-variance using training symbols results in loss of throughput.