MIMO—OFDM中基于波束成形的天线选择研究

为减少多输入多输出（MIMO）正交频分复用（OFDM）系统的复杂度，本文基于最小化差错概率准则，提出一种波束成形的天线选择算法。该算法不仅可以减少收发两端DFT／IDFT的个数，而且有效减少射频模块的个数，从而大大降低系统的复杂度。为降低天线选择算法本身的复杂度，文中提出一种简化的天线选择算法。仿真结果表明，与时频联合波束成形算法相比．相同性能要求下，其需要的射频模块的个数可减少37．5％以上。

Antenna Selection Based on Beamforming in MIMO-OFDM System

In order to reduce the complexity of MIMO (Multiple-Input and Multiple-Output) OFDM (Orthogonal Frequency Division Multiplexing) systems, an antenna selection algorithm is proposed based on beamforming with error probability minimization criteria. Using the proposed algorithm, both the number of DFT/IDFT (Discrete Fourier Transform/Inverse DFT) blocks and RF (Radio Fre-quency) chains can be reduced, which result in great system complexity reduction. To further reduce the complexity of the selection algorithm, a simplified scheme is also proposed. Simulation results show that, to achieve the same performance, the number of RF chains can be reduced by more than 37.5% in comparison with joint time- frequency beamforming algorithm.