Waveform design for integrated radar and communication system with orthogonal frequency modulation

Abstract

The exponentially increasing demand for spectrum from commercial communication applications has created additional stress on defense applications. The waveform design method to realize the integration of radar and communications for spectrum sharing has thus gained focus. In this study, we develop a frequency modulation (FM) scheme for the integrated radar and communication system with orthogonal FM function. The FM of our proposed waveform is a weighted sum of multiple sub-FM functions. This technique, which is based on sub-FM terms comprising the signal that is mathematically orthogonal in the inner product domain, is developed by rationally designing the sub-FM term. The information-bearing communication sequences are carried out by the coefficients of different sub-FM terms. These sub-FM terms are designed to be real for high-power efficiency, to be mathematically orthogonal with one another for the demodulation procedure, and to have a large degrees of freedom for bulk data transfer. The performance of the designed waveform, including time-bandwidth product, auto-ambiguity function, cross-ambiguity function, and demodulation procedure, is analyzed. Simulation results, which are presented to verify the performance of the designed waveform, show that the designed waveform has the capacity to realize radar and communication integration in one joint platform.