Abstract
Considerable interest has been shown in the coexistence between airborne radar and commercial communication systems in recent years. In particular, the integrated radar and communication system (IRCS) is promising for the airborne platforms like Unmanned Air Vehicles (UAVs). However, due to fast varying channels caused by high mobility, it is a great challenge for the fusion center to collect detection information within a given delay threshold through the air-to-ground (A2G) communication. Based on slowly varying components of the channel, i.e, target spectrum, power spectral densities of the signal dependent clutters, path loss and shadow fading, this paper considers the problem of power minimization for an IRCS and a base station (BS) coexisting in the same frequency band. The latency bound, latency violation probability (LVP), and channel capacity for the A2G communication to the fusion center are considered based on the effective capacity (EC) theory. The detection performance for radar and the rate requirement of BS user are also taken into account. The power allocation problem is non-convex and formulated to a monotonic optimization problem. Afterward, an efficient heuristic scheduling algorithm with acceptable computational complexity is proposed to solve the formulated problem. Then, the robust power allocation with channel estimation error is considered. Simulation results demonstrate the effectiveness of the proposed heuristic algorithm from the perspectives of the total transmit power, EC, and LVP of the IRCS.
Highlights
INTRODUCTIONCommunications and radar have typically been developed in isolation. with the spectral congestion concerns caused by the dramatic rise of commercial wireless communications, considerable interest exists in the coexistence between airborne radar and commercial communication systems in recent years
In the past, communications and radar have typically been developed in isolation
With the spectral congestion concerns caused by the dramatic rise of commercial wireless communications, considerable interest exists in the coexistence between airborne radar and commercial communication systems in recent years
Summary
Communications and radar have typically been developed in isolation. with the spectral congestion concerns caused by the dramatic rise of commercial wireless communications, considerable interest exists in the coexistence between airborne radar and commercial communication systems in recent years. With a constraint on the total power, the optimization problem, which simultaneously considers the conditional MI for radar and channel capacity for communications, is devised, and the analytic solution is derived. The target spectrum, PSDs of the signal dependent clutters, path loss and shadow fading of all channels are assumed to remain constant during the period of a block since the locations of IRCS, target, and BS user do not change too much. With channel information feedback once per block, the fusion center can be aware of all channels’ slowly varying components, i.e, target spectrum, PSDs of the signal dependent clutters, path loss and shadow fading. Prn,max and pBn,Smax are the maximum transmit power of the IRCS and BS on the nth subcarrier, respectively.
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