Approximate Minimum Variance Beamformer Suitable for Code Division Multiple Access System
Wang Wenjie,Jiang Bofeng,Yin Qinye
(Xi'an Jiaotong University, Xi'an 710049, China)

Abstract: A beamforming algorithm suitable for mitigation of multi-access interference in code division multiple access (CDMA) system is presented. It has been proved that the algorithm could obtain an optimal solution in the sense of minimum variance when interference number approaches infinity. The simulation results show that the algorithm approximates the Capon's minimum variance beamformer when the user number is greater than the number of array elements. It avoids the calculation of the array response covariance matrix and its inverse in addition to having the advantages of less computation and being free of coherent problem.
Keywords: array antenna;beamforming;code division multiple access (CDMA)