Chao Wang 0028 Bohan Zhang Xiaodan Zhang Ke Deng Linear precoder designs for interference alignment in constant MIMO interference channels. 3573-3578 2013 WCNC https://doi.org/10.1109/WCNC.2013.6555140 conf/wcnc/2013 db/conf/wcnc/wcnc2013.html#WangZZD13