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http://dx.doi.org/10.4313/JKEM.2011.24.2.102

Adaptive Multiuser MIMO Transmission in Wireless Systems with Cooperating Cells  

Lee, Jin-Hee (The School of Electrical Engineering, Korea University)
Ko, Young-Chai (The School of Electrical Engineering, Korea University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.2, 2011 , pp. 102-107 More about this Journal
Abstract
In multicell wireless systems with insufficient frequency reuse, user transmission will suffer other-cell interference (OCI). Cell cooperation is an effective way to mitigate OCI and increase the system sum rate. An adaptive scheme for serving one user in each cell was proposed in [1]. In this paper, we generalize that scheme by serving two users in each cell with adaptive zeroforcing beamforming (ZF) strategies. Based on our derived statistics of the signal-to-noise plus interference ratios, we choose the scheme to maximize the total ergodic sum-rate based on user locations. Through the numerical examples, we show that the total system sum rate can be improved by selecting appropriate transmitting strategy adaptively. As a result, our proposed system can explore spatial multiplexing gain without additional power and thus improves total system sum rate significantly.
Keywords
Multicell wireless system; multiuser multiple-input multiple-output; other cell interference; cell cooperation; zeroforcing beamforming;
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