| 摘要: |
| 正交时频空（Orthogonal Time Frequency Space，OTFS）调制作为极具潜力的调制方案能够显著提升高移动场景下通信系统的鲁棒性。传统的OTFS同步消息传递（Message Passing,MP）检测算法及其变体每次迭代都需要更新并传递所有的信息，从而导致收敛速度过慢。针对上述问题，提出基于残差的OTFS异步消息传递算法。该算法利用消息更新前后的差值作为知情调度信息来控制消息传递的顺序，从而实现迭代资源的非均匀分配。仿真结果表明，基于残差的OTFS异步消息传递算法相较于传统的同步消息传递算法，在信噪比为20 dB时，迭代次数减少了45%，误比特性能提高了7 dB。 |
| 关键词: 正交时频空(OTFS) 消息传递算法 残差置信度传播 知情调度 异步传播 |
| DOI：10.20079/j.issn.1001-893x.240401001 |
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| 基金项目:轨道交通工程信息化国家重点实验室(中铁一院) 开放课题(SKLKZ19-03) |
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| An Orthogonal Time Frequency Space Asynchronous Message Passing Algorithm Based on Residuals |
| ZENG Qinyue,LIU Lin |
| (1.Laboratory of Information Coding & Transmission,Southwest Jiaotong University,Chengdu 611756,China;2.State Key Laboratory of Rail Transit Engineering Informatization,Xi’an 710043,China) |
| Abstract: |
| As a promising modulation scheme,orthogonal time frequency space(OTFS) modulation can significantly improve the robustness of communication systems in high-mobility scenarios.The traditional OTFS synchronous message passing(MP) detection algorithm and its variants need to update and pass all the information every iteration,resulting in slow convergence speed.In order to solve above problems,an OTFS asynchronous message passing algorithm based on residuals is proposed.The algorithm uses the difference before and after the message update as the informed scheduling information to control the order of message delivery,so as to realize the non-uniform distribution of iterative resources.The simulation results show that compared with the traditional synchronous messaging algorithm,the residual-based OTFS asynchronous messaging algorithm reduces the number of iterations by 45% and improves the bit error performance by 7 dB when the signal-to-noise ratio is 20 dB. |
| Key words: orthogonal time frequency space(OTFS) message passing algorithm residual belief propagation informed scheduling asynchronous propagation |
