A novel sensing and symbiotic communication approach

Abstract

As next-generation technologies promise seamless integration of sensing and communication within unified systems by leveraging shared frequencies, signaling, and hardware, it is of interest to explore new communication approaches in a reciprocal and symbiotic manner. This letter proposes a sensing and symbiotic communication (SaSC) approach for uplink scenarios, where the base station simultaneously performs radar sensing, user communication, and backscatter information collection. To enforce symbiotic communications efficiently, adaptive reflective coefficients for backscatter nodes and diversity techniques for user communication receptions are jointly established. Upon this, closed-form expressions are derived to quantify outage probability for symbiotic communication and mutual information for radar sensing. Besides, deep quantitative analyses of high transmit power regimes and low rates are also analyzed to attain insights into system designs and solve a non-convex problem of the radar transmit power optimization to maximize radar mutual information under throughput constraints of symbiotic communication. Moreover, to achieve mutual interference cancellation between radar and symbiotic communication signals, a model of reversed radar symbols over consecutive periods has been outlined as a benchmark scheme. Simulation results affirm the potential and effectiveness of the proposed SaSC approach.