Adaptive Mode Selection for Backscatter-Assisted Communication Systems With Opportunistic SIC

In this paper, we propose and analyze adaptive passive and active radio mode selection for backscatter-assisted communication, in which the passive radio (PR) mode refers to the backscatter communication (BackCom), and the active radio (AR) mode refers to the traditional battery-assisted communication. This is motivated by the fact that the PR mode can harvest power from the radio frequency (RF) source to support "green communication", while the AR mode can provide the stable power supply. Besides, opportunistic successive interference cancellation (SIC) is exploited to mitigate the direct link interference (DLI), which is in contrast to previous works assuming ideal SIC. Two adaptive mode selection (AMS) schemes are proposed, i.e., power maximization (PM)-oriented AMS and outage minimization (OM)-oriented AMS. Since exact closed-form expressions for the outage performance of proposed schemes are not attainable, lower bounds are obtained to facilitate our analysis. For comparison, benchmark schemes including the PR and the AR modes are investigated. Simulation results demonstrate the correctness and the tightness of our analysis, and show that significant performance gain can be achieved in the proposed OM-oriented AMS scheme.