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MIMO-OFDM能极大提高系统的容量,同时能克服频率选择信道对于信号的影响。文中讨论了MIMO-OFDM信道估计中能解决带宽有效利用率的信道盲估计技术。在虚载波可用的情况下,信道盲估计可以不用循环前缀来提高信道利用率,避免由于插入导频符号而带来的资源浪费。通过对一个二传送、三接收天线系统的仿真结果表明,文中提出的噪声子空间方法,能有效地减少信道估计错误,使系统容量达到更高信道利用率。
MIMO-OFDM can greatly improve the system capacity, while overcoming the impact of frequency selective channel on the signal. In this paper, channel blind estimation techniques that can solve the problem of effective bandwidth utilization in MIMO-OFDM channel estimation are discussed. In the case of virtual carrier available, channel blind estimation may not use cyclic prefix to improve channel utilization, to avoid wasting resources due to inserting pilot symbols. The simulation results of a two-transmit and three-receive antenna system show that the proposed noise subspace method can effectively reduce the channel estimation error and make the system capacity reach higher channel utilization.