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A Downlink Spectral Efficiency Improvement Scheme Using Intercell Cooperative Spatial Multiplexing and Beamforming  

Chang, Jae-Won (Department of Electronics Engineering, Sogang University)
Jin, Gwy-Un (Department of Electronics Engineering, Sogang University)
Sung, Won-Jin (Department of Electronics Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.7, 2008 , pp. 45-52 More about this Journal
Abstract
In typical cellular systems using frequency reuse scheme, the terminal suffers a performance degradation due to the intercell interference signals from adjacent cells as the terminal moves toward the cell boundary. In this paper, a signal transmission and reception scheme which achieve spatial multiplexing and beamforming gain from a distributed MIMO (multiple-input multiple-output) channel using multiple-antenna terminal is proposed for the spectral efficiency enhancement in a multi-cell downlink environment, when geographically separated base stations cooperatively transmit signals. In particular, we analyze the effective signal-to-interference ratio and spectral efficiency of the proposed scheme for different frequency reuse patterns and for varying numbers of receive antennas, and compare with the performance of the MRC (maximal ratio combining) reception scheme in typical cellular systems. We evaluate the amount of transmission efficiency of the scheme by comparing the performance near the cell boundary where the strong intercell interference is experienced.
Keywords
협조적 전송;주파수 재사용;공간 다중화;빔포밍;분산 MIMO;다중 안테나 단말기;
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