Interference rejection by time selective sampling

In broadband receivers, small signals can be corrupted by the existence of large interferers operating in the presence of receiver nonlinearity. This paper proposes a time sampling scheme that keeps only samples that do not exceed a threshold amplitude and thus are not distorted by amplifier nonlinearities. After the receiver concept is described, preliminary measurements are presented to verify feasibility. Interferers plus a small message signal drive a standard commercial amplifier into saturation. Samples are taken using a high speed oscilloscope, sorted by amplitude and a subset selected for use in extracting the message signal. The error vector magnitude (EVM) of the extraction is plotted versus amplitude threshold and interference level. We discuss the effects that impact accuracy and the role of compressive sensing.