LTE-A下行 MIMO 链路时频同步方法研究

摘要

The OFDM ( orthogonal frequency division multiplexing ) technology used in LTE-A is very sensitive to frequency offset , even a small frequency offset will lead to the rapid decline in system performance .A good time-frequency estimation algorithm can significantly improve the system performance, therefore is one of the key techniques in receiver design .In this paper, we propose a multi-signal synchronisation ( MSS) method in LTE-A downlink with shared channel which is based on 4 ×4 MIMO, and carry out the software and hardware integrated simulating verification by C and LABVIEW tools .Simulation results show that the proposed synchronisation algorithm has 1~2 dB performance improvement than the classic algorithm .%LTE-A中使用的OFDM（ Orthogonal Frequency Division Multiplexing ）技术对频偏非常敏感，很小的频偏会导致系统性能的急剧下降，一个好的时频估计算法能够大幅提高系统性能，是接收机设计中关键技术之一。提出一种基于4发4收MIMO（ Multiple-Input Multiple-Output）的LTE-A下行共享链路的MSS（Multi-signal synchronization）同步方法，并利用C和LABVIEW进行了软硬件联合仿真验证。仿真结果表明，提出的同步算法较经典算法有1～2 dB的性能提升。