摘要
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 greatly improves the throughput in the two-way relay system. However, due to the difference between the two frequency offsets coming from two sources＇ transmitting signals and the fact that the signal at the relay node is overlapped, it is difficult to compensate the two different frequency offsets together. In the paper, this problem is analysied and a new method to calculate the compensation frequency offset based on golden section is put forward. Simulation results show that the algorithm has the same performance compared with the mean frequency offset compensation algorithm when the two signals from sources come through the symmetry channels, but in other cases that channels are not symmetry, the proposed algorithm will greatly improves the bit- error-rate（BER） performance of demodulated signal at the relay node,
出处
《软件》
2012年第12期130-135,共6页
Software
