Enhanced Channel-Estimation Technique for MIMO-OFDM Systems
MIMO-OFDM系统中一种有效的信道估计方法

In multi-input multi-output orthogonal frequency-division multiplexing systems,conventional channel estimation techniques using comb-type training symbols give relatively large mean squared errors(MSEs) at the edge subcarriers.To reduce the MSEs at these subcarriers,a cyclic comb-type training structure was proposed.In the proposed cyclic training structure,all types of training symbols were transmitted cyclically at each antenna.At the receiver,the channel frequency responses that were estimated using each training symbol were averaged with weights obtained from the corresponding MSEs.Computer simulations show that the proposed cyclic training structure gives more signal-to-noise ratio gain than the conventional training structure.