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Constrained Codebook Design for a MISO Beamforming System in a Rician Channel

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Executive Summary

This paper presents a limited feedback codebook design for a Multiple-Input Single-Output (MISO) beamforming system in a Rician fading channel. To support the Rician fading channel, the physical characteristics of the channel are exploited in designing the codebook by Grassmannian Line Packing (GLP). To this end, a portion of the total codewords is allocated for supporting the Line-Of-Sight (LOS) channel. By a proposed design procedure, it is possible to design a codebook which can increase the system capacity in a large K-factor region without any capacity loss in a Rayleigh fading channel. The simulation results show that the overall capacity can be remarkably increased by the proposed codebook.

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