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物理层网络编码技术大大提升了双向中继系统的吞吐量。然而,当把OFDM技术引入物理层网络编码双向中继系统中时,会产生很多问题,其中的一个问题就是很难在中继节点对两路上行OFDM信号的频率偏差同时做出有效补偿,这是因为两路信号的频率偏差不同,并且中继节点处的信号是叠加在一起的。本文对该问题进行了分析,提出了一种基于黄金分割数值计算方法的频率偏差补偿算法。仿真结果表明,在上行信道状况相同的情况下,该算法和补偿均值的方法性能相同,但是在其他的情况,即上行信道状况不同时,该算法将大大提高中继节点的误比特率性能。
Physical layer network coding technology has greatly enhanced the throughput of two-way relay system. However, many problems arise when OFDM technology is introduced into the physical layer network coding bidirectional relay system. One of the problems is that it is very difficult to effectively compensate for the frequency offset of the two uplink OFDM signals at the relay node. Because the frequency deviation of two signals is different, and the signal at the relay node is superposed together. This paper analyzes the problem and proposes a frequency offset compensation algorithm based on the golden section numerical method. The simulation results show that the proposed method has the same performance as the method of compensating the average under the condition of the same uplink channel. However, in other cases, when the condition of the uplink channel is different, the algorithm will greatly improve the bit error rate performance of the relay node.