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Beza?Negash?GetuEmail author J?rgen?Bach?Andersen 《Wireless Personal Communications》2004,30(1):27-61
The paper discusses the BER and spectral efficiency of different MIMO systems in random uncorrelated, correlated and deterministic environments, and more specifically uncorrelated and correlated Rayleigh and Ricean fading channels. It is known that the so-called MIMO eigenmode transmission assumes channel knowledge at the transmitter for pre-coding, whereas V-BLAST and STC do not assume the channel knowledge at the transmitter, instead they use it at the receiver for recovering the transmitted information. It is shown that for the same spectral efficiency, the BER performance of the MIMO eigenmode transmission outperforms MIMO systems like V-BLAST and STBC. In fully correlated random environment, transmitting through the largest eigenmode exploits the full transmitter-receiver array gain and diversity order, giving the maximal possible performance in terms of reducing the BER. In any of the scenarios, transmitting through the largest eigenmode gives better performance in terms of reducing the BER compared with STBC systems. Spatial multiplexing through the so-called eigensets (sets which consist of transmission modes with significant channel gain) outperforms systems like V-BLAST. In this context, adaptive modulation has been used to minimize the overall BER for a given spectral efficiency. 相似文献
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MIMO-OFDM最优导频设置与优化的信道估计方法 总被引:12,自引:0,他引:12
从系统设计的角度,根据最小化MSE原则,推导出一种基于MIMO—OFDM多发射天线优化的导频值插入方法,并提出一种健壮性的FDTC的信道估计处理方法。与已有的导频交替传输方法相比,这种优化的导频值能均布于各发射天线所有发射时段,尤其在时变信道中,具有更小的估计误差;在信道估计方法中,提出的频域分集时域合并的方法,通过仿真,表明这种方法能够更进一步的提高估计的精度,同时具有较好的健壮性和较低的计算复杂度。 相似文献
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一种低复杂度的MIMO-OFDM信道估计新方法 总被引:3,自引:1,他引:3
该文基于m序列设计了一种适合多天线收发-正交频分复用(MIMO-OFDM)系统的时域信道估计新方法.在时域OFDM符号之间插入附加循环前缀(CP)的m序列作为训练序列,在接收端将去掉循环前缀的接收序列与指定的循环移位m序列作相关运算,然后利用m序列的二值自相关特性获得信道的冲激响应估计,从而得到信道的频率响应估计.理论分析和仿真结果都表明:在频率选择性信道中,新方法在系统开销小、计算复杂度低的情况下可以取得比传统算法更好的性能. 相似文献
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