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A beam tracking algorithm for space-time Rake receiver with a new beamformer

A beamforming algorithm suitable for space-time Rake receiver in CDMA system is addressed. The algorithm is the optimal solution in the sense of minimum variance when interference number approaches to infinite. Simulation results demonstrate that the proposed algorithm approximates to the Capon's MVDR (minimum variance distortionless response) beamformer when the interference number is much more than the number of array elements. In comparison with Capon's, the algorithm has the advantages of lower computation and no coherent problem. Based on the method described above, a space-time searcher and a spatial frequency detector are presented, by which a beam tracking algorithm is proposed. Simulation results demonstrate that the algorithm can efficiently track the direction of desired signals and has the advantages of lower static error and better dynamic tracking performance.