Title :
Channel Estimation Error on Performance of Zero Force Beamforming Based Multiuser SDMA in Downlink
Author :
Zhang, Jianhua ; Liu, Guangyi
Author_Institution :
Beijing Univ. of Posts & Telecommun.
Abstract :
In a MIMO OFDMA multiuser system, the multiuser diversity gain can be achieved both in spatial and frequency domain by joint spatial and frequency scheduling. Although the channel estimation error (CEE) may degrade such multiuser diversity gain, little work has been performed on it. In this paper, we investigate the effect of the CEE on MIMO OFDMA downlink based on multiuser zero force beamforming (ZFB). The effect of channel estimation error on the signal to noise ratio of the desired user is analyzed, and the system spectrum efficiency is evaluated for different CEE value. The simulation results show that ZFB is not sensitive to CEE when a reasonable CEE value is guaranteed in a cellular system. Compared to the multiuser diversity gain from joint spatial frequency scheduling, the performance degradation from CEE is acceptable
Keywords :
MIMO communication; OFDM modulation; cellular radio; channel estimation; diversity reception; frequency division multiple access; radio links; space division multiple access; MIMO OFDMA multiuser system; cellular system; channel estimation error; downlink; joint spatial frequency scheduling; multiuser SDMA; multiuser diversity gain; multiuser zero force beamforming; signal to noise ratio; Array signal processing; Channel estimation; Degradation; Diversity methods; Downlink; Frequency diversity; Frequency domain analysis; MIMO; Multiaccess communication; Signal to noise ratio;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2006. WiCOM 2006.International Conference on
Conference_Location :
Wuhan
Print_ISBN :
1-4244-0517-3
DOI :
10.1109/WiCOM.2006.81
