基于最大比合并的低复杂度OTFS系统信号检测算法OA

In high-speed multipath environments,the orthogonality of orthogonal frequency division mul-tiplexing(OFDM)subcarriers is severely compromised by frequency dispersion.In contrast,orthogonal time frequency space(OTFS)modulation shows promising potential thanks to its excellent resistance to multipath and Doppler interferences.To reduce the signal detection complexity in OTFS systems,this pa-per proposes a low complexity signal detection algorithm based on maximal ratio combining.First,the al-gorithm reduces complexity by employing a zero-padding technique and exploiting the circulant structure property of channel matrices.Second,it employs the maximal ratio combining algorithm to extract and co-herently combine the received multipath signal components,thereby improving the signal-to-noise ratio of the combined signal.Third,the generalized minimal residual algorithm is utilized to simplify the inver-sion operation of the channel gain matrix,further lowering the algorithm's complexity.The comparative analysis incorporating computational complexity,bit error rate,and convergence speed of different algo-rithms demonstrates that the proposed algorithm achieves a faster convergence speed and lower computa-tional complexity while maintaining a competitive bit error rate performance.