NDLI: Transmit beamforming for a large reconfigurable antenna array

Content Provider	IEEE Xplore Digital Library
Author	Li Liu Jafarkhani, H.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., California Univ., Irvine, CA (Li Liu; Jafarkhani, H.)
Abstract	Many space-time transmission schemes have been proposed recently to exploit the high channel capacity from the MIMO communication systems. However, algorithms for a large antenna array (LAA) remain an open research problem. The standard channel estimation and space-time modulation schemes are not practical for LAAs due to high implementation complexity. In this paper, we propose a novel transmit beamforming scheme based on a reconfigurable LAA. Compared to the traditional schemes, our new scheme requires a much smaller number of radio frequency (RF) chains, yet it still enjoys the high performance offered from the LAA. Based on a reconfigurable LAA, we present a pilot assisted round robin channel estimation algorithm. With this estimation algorithm, the tracking of the fading channel is significantly simplified at the mobile station. We then introduce an adaptive transmit beamforming algorithm based on relative channel phase feedback at the transmitter. For a time varying Rayleigh fading channel, we investigate the system SNR as a function of the latency of the round robin channel estimation and derive the optimal training duration for given mobile speed. Finally, numerical simulations show that the proposed scheme accomplishes superior performance for various kinds of time varying Rayleigh fading channels. Overall, the proposed system enjoys good performance, high flexibility, low cost as well as low power consumption at both the base station and mobile station
Starting Page	6
Ending Page	3438
File Size	308707
Page Count	3433
File Format	PDF
ISBN	0780394143
DOI	10.1109/GLOCOM.2005.1578411
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Transmitting antennas Antenna arrays Round robin Channel estimation Fading Radio frequency Channel capacity MIMO Feedback
Content Type	Text
Resource Type	Article

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