摘要
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。
SC-FDMA （Single Carrier Frequency Division Multiple Access）, for its lower PAPR （Peak to Average Power Ratio）, attracts much attention from the people. In order to increase the effective transmit diversity and destroy no low-PAPR, a novel space-frequency coding scheme called SC-SFBC （single-carrier space-frequency block coding） is proposed. The transmission reliability of the SC-SFBC system is reduced because of carrier frequency offset （CFO） between transmitter and receiver. Thus the receiving signal model with CFO is established, and an iterative algorithm for compensating carrier frequency offset is suggested. Through iteration, ICI is separated and eliminated. CFO compensation and signal equalization are done at each subcarrier so that the complexity of the algorithm could be reduced. Simulation results show that the proposed method could improve the performance of SC-SFBC with CFO.
出处
《通信技术》
2011年第12期36-38,41,共4页
Communications Technology
