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The dual-functional radar-communication (DFRC) system is an attractivetechnique, since it can support both wireless communications and radar by aunified hardware platform with real-time cooperation. Considering the appealingfeature of multiple beams, this paper proposes a precoding scheme thatsimultaneously support multiuser transmission and target detection, with anintegrated continuous phase modulation (CPM) and linear frequency modulation(LFM) signal, based on the designed dual mode framework. Similarly to theconception of communication rate, this paper defines radar rate to unify theDFRC system. Then, the maximum sum-rate that includes both the communicationand radar rates is set to be the objective function. Regarding as the optimalissue is non-convex, the optimal problem is divided into two sub-issues, one isthe user selection issue, and the other is the joint beamforming design andpower allocation issue. A successive maximum iteration (SMI) algorithm ispresented for the former issue, which can balance the performances between thesum-rate and complexity; and maximum minimization Lagrange multiplier (MMLM)iteration algorithm is utilized to solve the latter optimal issue. Moreover, wededuce the spectrum characteristic, bit error rate (BER) and ambiguity function(AF) for the proposed system. Simulation results show that our proposed systemcan provide appreciated sum-rate than the classical schemes, validating theefficiency of the proposed system.

A Joint Beamforming Design and Integrated CPM-LFM Signal for Dual-functional Radar-communication Systems