Dynamic Spectrum Sharing for TD-LTE and FD-LTE Users Based on Joint Polarization Adaption and Beamforming

In this work, a joint polarization adaption and beamforming technique is proposed for horizontal spectrum sharing for TD-LTE and FD-LTE users. The polarization and spatial information of multiple dual-polarized antennas on current LTE nodes is exploited to mitigate the mutual interference among the primary, TD-LTE and FD-LTE users. By this means, the opportunities in polarization and spatial domains are exploited, which means the licensed spectrum can be shared by TD-LTE and FD-LTE users with primary users simultaneously, thus the spectrum efficiency is improved. Simulation results show that the proposed technique can improve the spectrum efficiency in comparison traditional spectrum sharing approaches that utilize the spectrum opportunities in temporal domain, while acceptable interference is introduced to the primary user.