Combating Strong-Weak Spatial-Temporal Resonances in Time-Reversal Uplinks

—In a time-reversal (TR) communication system, the signal-to-noise ratio (SNR) is boosted and the inter-user interference (IUI) is suppressed due to the spatial–temporal resonances, commonly known as the focusing effects, of the TR technique when implemented in a rich scattering environment. However, since the spatial–temporal resonances highly depend on the locationspecific multipath profile, there exists a strong–weak spatial– temporal resonances effect. In the TR uplink system, different users at different locations enjoy different strengths of spatial– temporal resonances, i.e., the received signal-to-interference-noise ratios (SINRs) for different users vary, and the weak ones can be blocked from correct detection in the presence of strong ones. In this paper, we formulate the strong–weak spatial–temporal resonances in the multiuser TR uplink system as a max–min weighted SINR balancing problem by joint power control and signature design. Then, a novel two-stage...

• Type: Journal
• Year: 2016
• Where: TWC
• Authors: Qinyi Xu, Yan Chen, K. J. Ray Liu
• Keywords: TWC 2016