Uplink Payload Power Control in Cell-Free Communication and Radar Networks

Abstract

This paper considers the cell-free (CF) massive multiple-input multiple-output (MIMO) architecture with an added virtual uplink radar integration. We consider joint communications and radar (JCR) in the uplink payload of the time-division duplex (TDD) frame and formulate a set of linear interference constraints in order to limit the user equipment (UE) interference imposed on the radar system at each access-point (AP) through power control. The constraints are incorporated into the sum spectral efficiency (SSE) and the sum-log-SNR (SLS) policies. Furthermore, a largest large-scale fading (LLSF) heuristic is formulated as an approximate low-complexity solution. Numerical simulations indicate that all methods provide similar performance in terms of spectral efficiency (SE) and that power control allows the communication system to be controlled to satisfy a given worst case radar performance.