提出了一种MIMO-OFDM系统中基于Walsh码的同步训练序列结构。利用该结构可以在有效完成符号同步的同时准确估计MIMO-OFDM系统中不同信道的载波频偏。在2×2的MIMO-OFDM系统下的仿真结果表明,使用本训练序列可以获得较好的符号同步和载波频偏估计性能。
This paper proposes a new synchronization training sequence structure based on Walsh codes for MIMO-OFDM systems. By exploring the orthogonality of Walsh codes the receiver can differentiate each transmitting sym bol and estimate the different channel frequency offsets respectively. The simulation results under 2 × 2 MIMO-OFDM system prove that by using the training sequences, the symbol timing and frequency offset estimation could achieve good performance.