Polar-Cap Codebook Design for MISO Rician Fading Channels with Limited Feedback

TL;DR

This paper introduces a polar-cap codebook design for MISO Rician fading channels with limited feedback, adaptively adjusting to LOS component strength to improve beamforming performance.

Contribution

It proposes a novel polar-cap codebook that considers LOS channel strength, enhancing transmit beamforming in Rician fading environments.

Findings

Significant SNR improvement with the new codebook

Adaptive codebook construction based on LOS strength

Enhanced beamforming performance in simulations

Abstract

Most of the prior works on designing codebooks for limited feedback systems have not considered the presence of strong line-of-sight (LOS) channel component. This paper proposes the design of polar-cap codebook (PCC) for multipleinput single-output (MISO) limited feedback systems subject to Rician fading channels. The codewords of the designed PCC are adaptively constructed according to the instantaneous strength of the LOS channel component. Simulation results show that the codebook can significantly enhance the performance of transmit beamforming in terms of received signal-to-noise ratio (SNR).