Hyun Jong Yang Joohwan Chun Arogyaswami Paulraj Asymptotic capacity of the separated MIMO two-way relay channel with linear precoding. 86-93 2010 Allerton https://doi.org/10.1109/ALLERTON.2010.5706892 conf/allerton/2010 db/conf/allerton/allerton2010.html#YangCP10