A ULA-Based MWC Discrete Compressed Sampling Structure for Carrier Frequency and AOA Estimation

A Sub-Nyquist Sampling Digital Receiver System Based on Array Compression

“…1, the number of array elements is L, and the number of branches is M with M < L. We design to detect and acquire the signal pulse in a very short time by using the proposed receiver. There would be only one signal detected and acquired in the short time [15]. Suppose that there is only one far-field narrowband signal s(t) impinging on the proposed CULA-based system with a Nyquist sampling rate f NY Q = 1/T NY Q ; the signal vector x(t) received by L antennas is…”

“…The low-pass filter h[n] is designed as an ideal filter with the cut-off frequency f s /2. We denote the mixing rate f s as f s = f p = 1/T p = f NY Q /M p , and f p ≥ B is designed to avoid edge effects [15]. According to spectrum segmentation characteristics of the MWC discrete CS system analysed in [15], the incident signal will only exist in an unknown sub-band l , and the spectrum information in other subbands can be approximately ignored.…”

“…According to the analysis of noise about MWC discrete CS structure in [11], it is known that the proposed system does not change the signal-to-noise ratio (SNR). Compared with the output of basic receiver proposed in [15] and [16], it is known that the new receiver has the same capabilities using less branches.…”

“…This method increased the complexity of the system. In [15], we proposed a ULA-based MWC discrete CS structure and achieved the joint estimation of the CF and angle-of-arrival (AOA) by processing the CS data directly. The cyclic-shifted pseudo random sequence (PRS) was used to mix the signal in each branch of the MWC, causing a special phase difference in the CS data.…”

“…Subsequently, we corrected the phase and used the MUSIC algorithm to estimate the CF and AOA. In [16], we extended the structure proposed in [15] and obtained the better estimation. However, in order to improve the performance, more branches are needed.…”