Title :
Performance of Transmit Beamforming Codebooks with Separate Amplitude and Phase Quantization
Author :
Dowhuszko, Alexis ; Hamalainen, Jyri
Author_Institution :
Dept. of Commun. & Networking, Aalto Univ., Aalto, Finland
Abstract :
A simple quantization scheme is proposed to adjust separately the amplitudes and phases of signals in a codebook-based Transmit Beamforming (TBF) scheme. The proposed quantization scheme is valid for both desired signal power maximization (egoistic TBF) and co-channel interference mitigation (altruistic TBF), and does not require an exhaustive search to find the optimal TBF vector. Performance results are presented when variable numbers of bits for amplitude and phase feedback resolutions are used for both egoistic and altruistic TBF schemes.
Keywords :
array signal processing; cochannel interference; feedback; interference suppression; quantisation (signal); TBF vector; altruistic TBF schemes; amplitude resolutions; beamforming codebooks; cochannel interference mitigation; codebook-based transmit beamforming scheme; egoistic TBF; phase feedback resolutions; phase quantization; quantization scheme; separate amplitude; signal power maximization; Antennas; Array signal processing; Interchannel interference; Quantization (signal); Signal to noise ratio; Vectors; Codebook design; interference mitigation; limited feedback terms; separate quantization; transmit beamforming;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2370762
