An OFDM adaptive antenna array based on beam-space CSI estimation

In current pre-FFT OFDM (pre-Fast Fourier Transform Orthogonal Frequency-Division) adaptive antenna systems, the CSI (Channel Statement Information) estimation is made in the element-space and the performance may deteriorate due to its poor anti-jamming ability. An adaptive antenna scheme based on beam-space CSI estimation is proposed to improve the accuracy and robustness of the estimation. The simulation results show that a prominent performance improvement can be achieved. In environments with strong interferences, the proposed scheme still performs well, while the element-space scheme may fail to work.