Inter-sector Beamforming with MMSE Receiver in the Downlink of TDD Cellular Systems

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Yeom, Jae-Heung; Lee, Yong-Hwan
Issue Date
Korea Information and Communications Society = 한국통신학회
Journal of Communications and Networks, vol.10, no.2, pp.118-126, June 2008
array gainbeamformingcooperationinterferenceminimum mean square estimate (MMSE)sector boundarytime division duplex (TDD)
The use of beamforming is effective for users in limited power environments. However, when it is applied to the downlink
of a cellular system with universal requency reuse, users near the sector boundary may experience significant interference from
more than one sector. The use of a minimum mean square error (MMSE)-type receiver may not sufficiently cancel out the interference
unless a sufficient number of receive antennas are used. In this paper, we consider the use of inter-sector beamforming that cooperates with a neighboring sector in the same cell to mitigate this interference problem in time-division duplex (TDD) environments. The proposed scheme can avoid interference from an adjacent sector in the same cell, while enhancing the transmit array gain by using the TDD reciprocity. The performance of the proposed scheme is analyzed in terms of the output signal-to-interference-plus-noise power ratio (SINR) and the output capacity when applied to an
MMSE-type receiver. The beamforming mode can be analytically switched between the inter-sector and the single-sector mode based
on the long-term channel information. Finally, the effectiveness of the proposed scheme is verified by computer simulation.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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