Abstract: A robust detection algorithm based on the array signal processing theory is proposed for V-BLAST(Vertical Bell Labs Layered Space-Time) OFDM systems with a channel estimation error. The covariance matrix of receive data is eigendecomposed, and the signal subspace is obtained. Then the channel vector (with error) is projected onto the subspace, and more accurate channel vector is obtained. According to the beamforming algorithm, the detection filter coefficients are calculated. Simulation results show that the performance of the proposed algorithm is much better than ZF(Zero-Forcing) and MMSE(Minimum Mean Square Error) algorithms.

Key words: Vertial Bell Labs Layered Space-Time(V-BLAST), Orthogonal Frequency Division Multiplexing(OFDM), channel estimation error, robustness