Nyquist folding analog-to-information receiver: Autonomous information recovery using quadrature mirror filtering

A broadband Nyquist-folding analog-to-information receiver, allows multiple Nyquist zones to be directly undersampled and subsequently folded into a continuous time analog interpolation filter. This paper presents a new algorithm that autonomously extracts the intercepted pulse parameters on the time-frequency plane using a quadrature mirror filter bank at the output of the interpolation filter. Parameters include a running calculation of the exact bandwidth, frequency, pulse duration and slope. By the examination of the signal's slope we show that a direct computation of the actual Nyquist zone is possible. Monte Carlo simulation runs are presented to demonstrate the robustness of the algorithm for −20≤SNR≤10 dB.