Coded-IRC Suppression Algorithm for Co-channel Interference in OFDMA
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摘要: 正交频分多址（Orthogonal Frequency Division Multiple Access，OFDMA）的同频干扰问题一直是蜂窝移动通信系统的研究重点。本文从信号域时延出发，通过分析推导了系统中干扰的表达式，并验证了不同相对时延方差下同频干扰（Co-Channel Interference, CCI）对系统的影响。针对干扰的异步非相关性以及传统干扰抑制合并（Interference Rejection Combining, IRC）算法的局限性，利用卷积码时延小、高编码增益的特点，采用Coded-IRC方法抑制干扰。仿真结果表明，时延导致的CCI在很大程度上降低了系统的误比特率性能,而Coded-IRC算法克服了IRC的局限，使得系统误比特率性能得到提升。Abstract: The co-channel interference of Orthogonal Frequency Division Multiple Access has been the research focus for cellular mobile communication system. This paper analyzes and derives the mathematic expression of the system interference with considering the delay of signal domain , and verify the Co-Channel Interference (CCI) influence on the system with vary relative delay variances. In view of the limitations for co-channel due to the asynchronous non-correlative interference and the Interference Rejection Combining (IRC) and the advantages of convolutional code with small time delay and high coding gain Coded-IRC algorithm is presented to suppress interference. The simulation results show that the CCI resulting from delay decreases the system bit error rate performance, and the Coded-IRC algorithm overcomes the limitations of the IRC and improves the system bit error rate performance.
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