Experimental Performance Results of Adaptive Antenna Array System at Base and Mobile Stations in Mobile Environment
Okino Kenta, Fangwei Tong, Yamazaki Chiharu, Tohru Sunaga, Masanori Kato, Shigeru Kimura · 2006
In a TDD based AAA/SDMA system, the array weights determined from up-link signals are applied to the downlink transmission because of the channel reciprocity. However, under fast fading conditions, for example due to fast moving MS, the array weights are no longer optimum for the downlink signal transmission and hence the spectral efficiency of the system degrades. In this paper, we present the downlink performance of MS with two antenna elements moving at speeds of ~5, 20 and 40 kmph in the field trial system of i-Burst, which is a wireless broadband system employing AAA and SDMA techniques. The field experiment results show that adaptive antenna processing at MS is effective in improving the mobility performance of TDD-AAA/SDMA system