Research Article
Feedback Overhead Reduction Method for 3D MIMO Precoding Systems
@INPROCEEDINGS{10.4108/icst.chinacom.2014.256224, author={li liu and Xiao Jing and Xue Wu}, title={Feedback Overhead Reduction Method for 3D MIMO Precoding Systems}, proceedings={9th International Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2015}, month={1}, keywords={3d mimo spatial-correlated limited feedback pmi feedback overhead}, doi={10.4108/icst.chinacom.2014.256224} }- li liu
Xiao Jing
Xue Wu
Year: 2015
Feedback Overhead Reduction Method for 3D MIMO Precoding Systems
CHINACOM
IEEE
DOI: 10.4108/icst.chinacom.2014.256224
Abstract
For 3D MIMO precoding systems over spatially correlated channel, a novel limited feedback method is proposed by utilizing the nature of the spatial correlation and clustering of the subchannel of transmitting and receiving antenna pair. In this method, due to the co-phased and spatial-correlated characteristics of the vertical channel for 2D antenna array, each vertical antenna is assumed to have the same horizontal phase and all the horizontal channels only feedback one precoding matrix index (PMI), while the adjacent vertical channels are grouped into clusters and the subchannels in the same cluster use the same precoding vectors. Then an auxiliary bit is added in front of the horizontal and vertical PMI to classify the two type feedback bits. According to the feedback bits, the base station (BS) finds the horizontal and vertical precoding vectors, and re-constructs the 3D precoding matrix by expanding and pointing multiplication operation. The simulation results show that the method can obtain good BER performance with reduced feedback overhead.