基于检测残差消除的CP-OTFS系统信号检测算法OACSTPCD

Orthogonal time frequency space(OTFS)modulation,known for its high resistance to frequency dispersion,is expected to become a key technology for communication in high-mobility scenarios in 6G.By introducing a cyclic prefix(CP)at the transmitter of the OTFS system,it is possible to overcome inter-symbol interference caused by channel multipath effects.To address the issue of high computational complexity in current CP-OTFS system signal detection algorithms,a signal detection algorithm based on the elimination of residual of detection is proposed.After using low complexity initial detection in time-frequency domain,the initial residual of detection is calculated by combining the input-output relationship of system delay-time domain.By taking the residual of detection as an iterative variable,the detection signal is updated by calculating the feedback value,and the maximum likelihood detection is carried out symbol by symbol in delay-Doppler domain.The residual of detection is gradually eliminated in the process of iterative calculation,and the stopping criterion of the algorithm is given.The experimental results demonstrate that the proposed algorithm improves the bit error performance by 2.79 dB in comparison with the linear minimum mean square error(LMMSE)algorithm and 1.76 dB in comparison with the message passing(MP)algorithm when the signal-to-noise ratio(SNR)is at 15 dB.Additionally,the proposed algorithm exhibits better convergence and lower computational complexity.