Unitary space vector quantization codebook design for spatial correlated limited feedback MIMO system

In the transmitting, beamforming, and receivingcombing (TBRC) MIMO system, a codebook based feedbackstrategy is usually used to provide the transmitter with thebeamforming vector. The adopted codebook affects the systemperformance considerably. Therefore, the codebook design is akey technology in the TBRC MIMO system. In this article, theunitary space vector quantization (USVQ) codebook designcriterion is proposed to design optimal codebooks for variousspatial correlated MIMO channels. And the unitary spaceK-mean (USK) codebook generating algorithm is provided togenerate the USVQ codebooks. Simulations show that thecapacities of the feedback based TBRC systems using USVQcodebooks are very close to those of the ideal cases.