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This paper proposes an effective method for frequency spectrum estimation using multi-channel co-prime sampling. Previous work has adopted a multi-channel sampling system to sense sparse signals, but its model suffers from the grid mismatch problem and the average sampling rate is high due to the redundancy among different channels. In this paper, we design a multi-channel co-prime sampling scheme...
In this paper, a novel transmission scheme based on constellation rotation and weighted fractional Fourier transform (WFRFT) is proposed to enhance the physical-layer security in polarization modulation (PM)-based dual-polarized satellite communications. Typically, by appropriately selecting the WFRFT order, the distribution of the signals processed by WFRFT can be close to Gaussian, which makes them...
Chirp spread spectrum (CSS) technique has been extensively studied in the application of Ultra-wide band (UWB). Considering the long distance propagation capacity and low intercepted probability of chirp signal, we propose to apply the CSS technique to the very low frequency (VLF) communication system. First, we discuss the CSS system based on fractional Fourier transform (FRFT), including the definition...
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