Reduced-dimension eigen-direction alignment precoding for MIMO two-way relay channels

Tao Yang, Xiaojun Yuan, Iain B. Collings
2012 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC)  
We propose a new reduced-dimension (RD) eigendirection alignment (EDA) precoder for MIMO two-way relay channels (TWRCs) with nR > nT , where nR denotes the number of antennas at the relay, and nT is that at each of the two users. The RD-EDA precoder can efficiently create aligned eigen-modes for the two users, enabling independent streams of physical-layer network coding. We investigate the design of the RD-EDA and develop a simple suboptimal solution. It is shown that the proposed RD-EDA
more » ... performs close to the sum-capacity upper bound of the MIMO TWRC. Moreover, it is shown that the proposed scheme can significantly outperform other existing schemes in the literature.
doi:10.1109/pimrc.2012.6362869 dblp:conf/pimrc/YangYC12 fatcat:37uqm4n5jrbgpn53n7bkjdajby