Abstract
According to the Tag application with function of covert communication, a method for sparse frequency waveform design based on radar-embedded communication is proposed. Firstly, sparse frequency waveforms are designed based on power spectral density fitting and quasi-Newton method. Secondly, the eigenvalue decomposition of the sparse frequency waveform sequence is used to get the dominant space. Finally the communication waveforms are designed through the projection of orthogonal pseudorandom vectors in the vertical subspace. Compared with the linear frequency modulation waveform, the sparse frequency waveform can further improve the bandwidth occupation of communication signals, thus achieving higher communication rate. A certain correlation exists between the reciprocally orthogonal communication signals samples and the sparse frequency waveform, which guarantees the low SER (signal error rate) and LPI (low probability of intercept). The simulation results verify the effectiveness of this method.
Highlights
The purpose of general radar-communication integration design is to achieve high bandwidth data communications between radar platforms by using radar transmitter/receiver subsystem
We propose the sparse frequency waveform design based on radar-embedded communication to improve the performance of the existing radar Tag system with the function of covert communication
Sparse frequency waveforms are designed based on power spectral density fitting with the quasi-Newton method and the eigenvalue decomposition is used to get the dominant space of the waveform sequence
Summary
The purpose of general radar-communication integration design is to achieve high bandwidth data communications between radar platforms by using radar transmitter/receiver subsystem. Due to nearly flat spectral characteristic of LFM, the embedded communication signals can only utilize a small range of spectrum band, which leads to limited available communication waveform samples and low efficiency of communication. In view of this problem, a method for sparse frequency waveform design based on radar-embedded communication is proposed. It can improve the band utilization of the communication signal, increase the number of communication samples, and achieve low signal error rate and low probability of intercept while the detecting performance of the radar will not be degraded. The use of sparse frequency waveform stopband can effectively increase the frequency band occupation of communication signals, to gain a higher communication rate
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