Wideband receiver design using frequency-dependent magnitude/phase mismatch

Abstract

We propose a digital wideband receiver scheme covering multiple Nyquist zones by exploiting phase and magnitude mismatch in the conversion from real-valued signals to complex-valued signals. The digital wideband receiver is designed to detect uncooperative signals. The magnitude/phase mismatch due to an imperfect hybrid coupler is often considered undesirable and needs to be compensated. However, by exploiting the frequency-dependent magnitude/phase mismatch phenomenon, we can distinguish signals from different Nyquist zones. Simulation results demonstrate that, using carefully designed magnitude/phase mismatch, we can detect signals over multiple Nyquist zones. The proposed method can lead to a new wideband receiver design.

A comparison of modified periodogram and Blackman-Tucky methods for wideband receiver applications

“…The wideband receiver like an electronic warfare receiver is designed to detect an unknown number of signals and determine their characteristics [1][2][3][4][5][6][7][8][9]. A simplified Fast Fourier Transform (FFT)-based wideband receiver is illustrated in Fig.…”