Research Article
Limited feedback scheme based on zero-forcing precoding for multiuser MIMO-OFDM downlink systems
@INPROCEEDINGS{10.4108/ICST.WICON2010.8548, author={Zhiyong Chen and Wenbo Wang and Mugen Peng and Fengming Cao}, title={Limited feedback scheme based on zero-forcing precoding for multiuser MIMO-OFDM downlink systems}, proceedings={5th International ICST Conference on Wireless Internet}, publisher={IEEE}, proceedings_a={WICON}, year={2010}, month={4}, keywords={Zero-forcing precoding CQI CDI MMSE MU-MIMO}, doi={10.4108/ICST.WICON2010.8548} }- Zhiyong Chen
Wenbo Wang
Mugen Peng
Fengming Cao
Year: 2010
Limited feedback scheme based on zero-forcing precoding for multiuser MIMO-OFDM downlink systems
WICON
IEEE
DOI: 10.4108/ICST.WICON2010.8548
Abstract
Conventional zero-forcing precoding was well investigated, but it hadn't considered the channel quality indicator (CQI) mismatch for practical system with limited feedback. This paper studies a novel zero-forcing precoding with channel quality indicator (CQI) estimation and adjusting, channel directional information(CDI) quantization, user scheduling and link adaptation and then proposes a CQI estimation algorithm for multiuser multiple input multiple output antenna (MU-MIMO) downlink systems with limited feedback. Simulation with 3GPP long term evolution system demonstrates that the scheme with proposed method can significantly improve system performance, compared with conventional zero-forcing precoding and single user MIMO systems.