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http://dx.doi.org/10.5515/KJKIEES.2009.20.3.248

An Adaptive Adjacent Cell Interference Mitigation Method for Eigen-Beamforming Transmission in Downlink Cellular Systems  

Chang, Jae-Won (Department of Electronic Engineering, Sogang University)
Kim, Se-Jin (Department of Electronic Engineering, Sogang University)
Kim, Jae-Won (Department of Electronic Engineering, Sogang University)
Sung, Won-Jin (Department of Electronic Engineering, Sogang University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.3, 2009 , pp. 248-256 More about this Journal
Abstract
EB(Eigen-Beamforming) has widely been applied to MIMO(Multiple-Input Multiple-Output) systems to form beams which maximize the effective signal-to-interference plus noise ratio(SINR) of the receiver using the singular value decomposition(SVD) of the MIMO channel. However, the signal detection performance for the mobile station near the cell boundary is severely degraded and the transmission efficiency decreases due to the influence of the interference signal from the adjacent cells. In this paper, we propose an adaptive interference mitigation method for the EB transmission, and evaluate the reception performance. In particular, a reception strategy which adaptively utilizes optimal combining(OC) and minimum mean-squared error for Intercell spatial demultiplexing(MMSE-lSD) is proposed, and the reception performance is investigated in terms of the effective SINR and system capacity. For the average system capacity, the proposed adaptive reception demonstrates the performance enhancement compared to the conventional EB reception using the receiver beamforming vector, and up to 2 bps/Hz performance gain is achieved for mobile station located at the cell edge.
Keywords
Cellular System; MIMO; Eigen-Beamforming; Intercell Interference; Interference Mitigation;
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