论文部分内容阅读
单载波频分多址(SC-FDMA)系统由于其低峰均比特性,广泛受到人们的关注。为了有效的增加发射分集但又不破坏其低峰均比特性,一种新型的空频编码方案即单载波空频块编码(SC-SFBC)被发现。针对单载波空频块编码系统中,发射机与接收机之间存在载波频偏(CFO)降低链路传输可靠性问题,建立接收信号模型,提出一种迭代载波频偏补偿方法。提出的算法通过分离子载波间干扰(ICI)并迭代消除,同时每个子载波独立进行频偏补偿与均衡,降低算法复杂度。仿真结果表明这种算法能显著提高存在载波频偏时的SC-SFBC系统性能。
Single-carrier frequency division multiple access (SC-FDMA) systems have drawn much attention due to their low peak-to-average ratio. In order to effectively increase the transmit diversity without damaging the low peak-to-average ratio, a new type of space-frequency coding scheme called single-carrier space-frequency block coding (SC-SFBC) was found. For single-carrier space-frequency block coding system, Carrier Frequency Offset (CFO) exists between the transmitter and the receiver to reduce the reliability of the link transmission. The received signal model is established and an iterative carrier frequency offset compensation method is proposed. The proposed algorithm separates subcarrier interference (ICI) and iteratively cancels each other, while each subcarrier independently compensates for frequency offset and equalization, reducing the complexity of the algorithm. The simulation results show that this algorithm can significantly improve the SC-SFBC system performance in the presence of carrier frequency offset.