Interference Suppression with Downlink Beamforming for a TDD-Based OFDMA System

Eunchul YOON  Sun-Yong KIM  Suhan CHOI  Hichan MOON  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.2   pp.666-670
Publication Date: 2009/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.666
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
interference suppression,  downlink beamforming,  OFDMA,  

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The downlink beamforming weights which can suppress interfering signals toward out-of-cell mobile stations for a TDD-based OFDMA system are introduced. First, the downlink beamforming weights are optimally designed based on iteration. Then, the downlink beamforming weights are designed in a sub-optimal way. It is shown that the sub-optimally designed downlink beamforming weights have the same structure as that of the uplink beamforming weights which are derived based on MMSE. The performance of these schemes is compared based on the average receive SINR. The performance of a heuristic scheme which exploits uplink beamforming weights for downlink beamforming weights is also investigated.