Transmit Beamforming with Reduced Feedback Information in OFDM Based Wireless Systems

Abstract

-This paper considers a transmit beamforming scheme that works with reduced feedback information in OFDM based multiple-input single-output (MISO) wireless systems. The proposed scheme generates the beamforming weight using information on the previous beamforming weights and channel correlation, significantly reducing the amount of feedback signaling burden. The feedback signaling overhead can further be reduced with the use of clustering and interpolation techniques. Simulation results show that the proposed scheme outperforms conventional beamforming techniques, while using the same amount of feedback signaling overhead.

Beamforming matrix quantization with variable feedback rate

“…One is codebook based such as the vector quantization (VQ) scheme proposed in [5][6][7][8][9][10], and another is by using the Givens Rotation (GR) [1,4,[11][12][13]. Compared with the GR-based scheme, the VQ approach requires a higher storage, as a set of codebooks is needed for a particular antenna setting.…”