矩形窗正交时频空检测算法

An Orthogonal Time Frequency Space Detecting Algorithm with Rectangular Waveform

针对正交时频空(Orthogonal Time Frequency Space,OTFS)调制系统采用矩形窗函数时,信道矩阵结构复杂导致的鲁棒性差的问题,提出了一种基于时域处理和酉近似消息传递的检测算法。该算法首先添加循环前缀,将时域信道转换为分块对角矩阵;然后应用酉变换和近似消息传递建立迭代检测算法。仿真结果表明,所提检测算法能够在不增加复杂度的条件下有效提升检测精度和鲁棒性,特别是存在信道编码的条件下表现出2 dB的性能增益,使得该算法更适用于杂散多径、高速移动等环境,具有较高的应用价值。

To solve the problem of complex channel matrix structure when rectangular window function is used in orthogonal time-frequency space(OTFS)modulation system,a detection algorithm based on time domain processing and unitary approximate message transfer is proposed.In this algorithm,the time domain channel is converted to block diagonal matrix by adding cyclic prefixes(CP),and then an iterative detection algorithm is established by using unitary transformation and approximate message passing(AMP).Simulation results show that the proposed detection algorithm can effectively improve the detection accuracy and robustness without increasing the complexity.In the presence of channel coding,the performance gain is 2 dB,which makes it suitable for the scenarios of stray multipath and high-speed movement,so it has high application value.