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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...
In this paper, a directional polarization modulation (DPM) scheme is proposed to enhance the secure transmission performance of the dual-polarized satellite multi-input multi-output (MEMO) system. Indeed, the signal's polarization state (PS) is determined by its two components and two orthogonally polarized arrays are designed to transmit these two components in the proposed scheme. In this way, the...
The problem of joint frequency and direction of arrival (DOA) estimation for multiple narrowband signals is addressed here. Previous work has employed co-prime arrays and co-prime samplers to estimate the frequency and DOA individually. Though this can increase the degrees of freedom (DOFs) in the space or time domain, the drawback lies in that it requires an extra procedure to pair these two kinds...
The transmit signal with good performance is the precondition of the excellent multiple-input and multiple-output (MIMO) synthetic aperture radar (SAR). In order to obtain waveforms of MIMO SAR based on linear frequency modulation with higher tolerance of receiver noise, the improved non-dominated sorting genetic algorithm II (NSGA-II) with elite strategy is proposed. Application of orthogonal linear...
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