单天线干扰消除
异步通信
计算机科学
瑞利衰落
误码率
偏移量(计算机科学)
载波频率偏移
干扰(通信)
频率偏移
多用户检测
算法
诺玛
电子工程
衰退
电信
正交频分复用
电信线路
码分多址
频道(广播)
解码方法
程序设计语言
工程类
作者
Chang Liu,Sheng Wu,Chunxiao Jiang,Hongwen Yang
出处
期刊:China Communications
[Institute of Electrical and Electronics Engineers]
日期:2022-11-01
卷期号:19 (11): 195-208
标识
DOI:10.23919/jcc.2022.00.009
摘要
An asynchronous transmission scenario for non-orthogonal multiple access (NOMA) user signals with arbitrary phase offset is investigated in this paper. To improve the system performance in the user power-balanced conditions, we adopt a synthetic detection method at the receiver, i.e., the jointly optimal maximal likelihood detection aided triangular successive interference cancellation (JO ML-TSIC) method. Analytical bit error rate (BER) solutions are obtained for a two-user case with the optimal, intentional one-half symbol period time delay implemented between the user signals. Furthermore, closed-form BER solutions for the case using the triangular successive interference cancellation (TSIC) detection method are also derived for comparisons. Numerical results show that the JO ML-TSIC receiver for the asynchronous system outperforms the TSIC receiver as well as the synchronous successive interference cancellation (SIC) receiver in all the conditions concerned. The results also show that the superiority of the JO ML-TSIC receiver is strengthened when the signals experience flat Rayleigh fading channels compared to the TSIC and the synchronous SIC receivers.
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