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http://dx.doi.org/10.7840/kics.2016.41.12.1903

Reduced Feedback Beamforming with a Large Antenna Array in Wireless Backhaul Downlink Systems  

Park, Jaebum (School of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Kwon, Girim (School of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Park, Hyuncheol (School of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.41, no.12, 2016 , pp. 1903-1913 More about this Journal
Abstract
In this paper, we propose 2-stage beamformer with linear receiver in wireless backhaul downlink system where macro base station has large antenna array with sub-array structure. Also, to compare the system capacity, we apply 3-stage beamformer with zero-forcing precoder and calculate the achievable sum rate of received small cell base stations. Considering scattering and path-loss property of wireless backhaul channel, we combine precoding technique for spatial multiplexing and beamforming technique to overcome path-loss. Therefore, we design DFT-based fixed beam patterns for the first stage. The simulation results show that considering spatial multiplexing, proposed 2-stage beamformer with linear receiver can increase the achievable sum rate as well as reduce the feedback information.
Keywords
Large antenna array; wireless backhaul; 2-stage beamformer; block diagonalization; reduced feedback;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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