Tuo Wu Miao Jiang Qi Zhang 0002 Quanzhong Li 0001 Jiayin Qin Beamforming Design in Multiple-Input-Multiple-Output Symbiotic Radio Backscatter Systems. 2019 abs/1907.05585 CoRR http://arxiv.org/abs/1907.05585 db/journals/corr/corr1907.html#abs-1907-05585