If the angular spread is not zero, the diversity gain can be achieved in the antenna-array reception. In order to achieve the diversity gain, this paper proposes a beamforming method that utilizes two beamforming weight vectors and applies this beamforming technique to Code-Division Multiple-Access (CDMA) systems equipped with antenna arrays under a time-varying multipath-fading channel environment. In the proposed beamforming method, the channel vector has been estimated using two basis vectors that span the signal subspace. Since the proposed beamforming method utilizes two-Dimensional (2-D) signal subspace, it provides better performance than the conventional beamforming method, which utilizes one-dimensional signal subspace.
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