| 摘要: |
| 正交时频空（Orthogonal Time and Frequency Space,OTFS）作为6G候选调制方案，旨在支持下一代无线通信系统在高速移动场景的异构性需求。为解决系统硬件成本高昂和功耗高的问题，构建了低精度量化OTFS系统，并推导了b-bit量化最小均方误差（Minimum Mean Square Error,MMSE）检测矩阵。通过加性量化噪声模型（Additive Quantization Noise Model,AQNM）推导系统输入-输出关系，并基于MMSE接收机评估系统误比特率（Bit Error Rate,BER）和可达速率性能。仿真结果表明，4-bit量化较全精度量化系统性能在BER=10-2处损失约1 dB，可达速率减小约0.98%；8-bit量化与全精度量化的可达速率相当，验证了分析结果的有效性。 |
| 关键词: 正交时频空(OTFS) 低精度量化 快速时变信道 |
| DOI：10.20079/j.issn.1001-893x.240912001 |
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| 基金项目:中国博士后科学基金项目第74批面上资助项目（2023M740223）；2023年度国家资助博士后研究人员计划（GZC20230241） |
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| Performance Analysis of OTFS System with Low-resolution Quantization |
| ZHANG Xinyue,LI Hua,LI Xing |
| (1.PotinBeijing Technology Co.,Ltd.,Beijing 100096,China;2.School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China) |
| Abstract: |
| Orthogonal time frequency space(OTFS) is a candidate modulation scheme for the sixth generation mobile communication(6G) to support heterogeneous requirements of next wireless communication systems in high-mobility scenarios.Considering the problems of high hardware cost and power consumption,the authors construct a low-resolution quantized OTFS system and derive a minimum mean square error(MMSE) detection matrix based on b-bit quantization.The input-output relationship of the system is derived using the additive quantization noise model(AQNM),and the bit error rate(BER) and achievable rate performance are evaluated using the MMSE receiver.Numerical results show that 4-bit quantization loses about 1 dB of performance at BER=10-2 and decreases the achievable rate by around 0.98% compared with full-resolution quantization;8-bit quantization achieves achievable rate comparable to full-precision quantization,confirming the validity of the analytical results. |
| Key words: orthogonal time frequency space(OTFS) low-resolution quantization fast time-varying channel |
