Low Complexity Turbo SIC-MMSE Detection for Orthogonal Time Frequency Space Modulation

作者：Qi Li, Jinhong Yuan, Min Qiu, Shuangyang Li, Yixuan Xie · 发表于：IEEE Transactions on Communications · 年份：2024 · DOI：10.1109/tcomm.2024.3357431 · 被引用次数：34 · 研究领域：Satellite Communication Systems、Wireless Communication Networks Research、Advanced Wireless Communication Techniques

Recently, orthogonal time frequency space (OTFS) modulation has garnered considerable attention due to its robustness against doubly-selective wireless channels. In this paper, we propose a low-complexity iterative successive interference cancellation based minimum mean squared error (SIC-MMSE) detection algorithm for zero-padded OTFS (ZP-OTFS) modulation. In the proposed algorithm, signals are detected based on layers processed by multiple SIC-MMSE linear filters for each sub-channel, with interference on the targeted signal layer being successively canceled either by hard or soft information. To reduce the complexity of computing individual layer filter coefficients, we also propose a novel filter coefficients recycling approach in place of generating the exact form of MMSE filter weights. Moreover, we design a joint detection and decoding algorithm for ZP-OTFS to enhance error performance. Compared to the conventional SIC-MMSE detection, our proposed algorithms outperform other linear detectors, e.g., maximal ratio combining (MRC), for ZP-OTFS with up to 3 dB gain while maintaining comparable computation complexity.