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利用配置多个天线实现高速可靠的通信是当今无线通信领域研究的热点之一。本文介绍了具有多个天线系统的几种不同构成方式 ,从系统误码率和频带利用率两个方面讨论了不同构成方式对系统的改善。同时 ,对多天线技术应用于正交频分复用 (OFDM)系统的性能进行了分析 ,并给出了频率选择性瑞利衰落信道中最优译码算法下的系统性能比较。仿真结果表明 ,多天线OFDM系统既保持了OFDM抗频率选择性衰落的特点 ,又能够改善系统的误码率性能 ,提高频带利用率。
It is one of the hot spots in the field of wireless communication today to realize the high-speed and reliable communication by using multiple antennas. This paper introduces several different ways of constructing multiple antenna systems, and discusses the improvement of the system from two aspects of system bit error rate and frequency band utilization. At the same time, the performance of multi-antenna technology applied to Orthogonal Frequency Division Multiplexing (OFDM) system is analyzed and the system performance comparison is given under the optimal decoding algorithm in frequency-selective Rayleigh fading channels. The simulation results show that the multi-antenna OFDM system not only maintains the anti-frequency selective fading characteristics of OFDM, but also improves the BER performance and frequency band utilization.