Title :
Codebook Design for LTE-A Downlink System
Author :
Wu, Lu ; Chen, Jinhui ; Yang, Hongwei ; Lu, Di
Author_Institution :
Res. & Innovation Center, Alcatel-Lucent Shanghai Bell, Shanghai, China
Abstract :
Multiple-input multiple-output (MIMO) has been adopted by long term evolution (LTE) and its updated version LTE-Advanced (LTE-A) to increase the spectrum efficiency. However, the benefits of multi-user (MU) MIMO highly rely on the accurate channel knowledge at the transmitter. So proper codebook design is a key problem for LTE-A FDD downlink system. In this paper, a codebook design with phase adjustment in the precoder targeting wideband channel properties is proposed. The average cell spectrum efficiency and cell-edge user spectrum efficiency of the proposed scheme are evaluated through system level simulation and compared to the discrete Fourier transform (DFT) based feedback scheme. The results show that the proposed codebooks significantly improve feedback efficiency and system performance for co-polarized linear antenna array.
Keywords :
Long Term Evolution; MIMO communication; codecs; discrete Fourier transforms; feedback; linear antenna arrays; precoding; telecommunication channels; DFT based feedback scheme; LTE-A FDD downlink system; LTE-A downlink system; MIMO; cell-edge user spectrum; codebook design; copolarized linear antenna array; discrete Fourier transform; feedback efficiency; long term evolution; multi-user MIMO; multiple-input multiple-output; precoder targeting wideband channel properties; Antenna feeds; Arrays; Discrete Fourier transforms; Downlink; MIMO; Vectors;
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2011 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-8328-0
DOI :
10.1109/VETECF.2011.6092993
