Joint Estimation of Carrier Frequency and DOA Based on the MR-MWC System

In view of the problems that the traditional Nyquist sampling generates huge data volume and the existing array compressed sampling systems have complex structures and large reconstruction operations, this paper proposes an ar⁃ ray reception system based on an improved modulated wideband converter (MWC) of uniform linear array, which can direct⁃ ly perform carrier frequency and direction of arrival (DOA) estimation on the compressive sampling (CS) data of the re⁃ ceived signal without reconstruction. The proposed system sets multiple MWC branches after the first antenna, and selects the periodic cyclic shift pseudo-random sequence as the mixing function, so that there is a fixed phase difference between the compressed sampled values of adjacent branches, and the subband index estimation can be obtained from the phase differ⁃ ence. The baseband frequency is estimated by FFT (Fast Fourier Transform) spectral line interpolation method, and the carri⁃ er frequency estimation of the received signal can be obtained when the two estimated values are combined. The rest of the array antennas are set as a single channel MWC structure, and the mixing function of each channel is the same as that in the first MWC branch of the first array antenna, which avoids the need for phase compensation and the resulting error in DOA es⁃ timation. The high-resolution multiple signal classification (MUSIC) algorithm can be directly used to complete DOA esti⁃ mation on the CS data obtained from the first branch and other array antennas. The experimental simulation results show that the proposed system can estimate the carrier frequency and DOA parameters of the target from the compressed sampling data. © 2023 Chinese Institute of Electronics. All rights reserved.