Patent ID: 9543994
Date: 2017-01-10
CPC Classifications: H04B

Claim:
1. A method for estimating a swept-tone interferer, the method comprising: receiving a composite signal over an observation bandwidth, wherein the composite signal comprises a signal of interest and the swept-tone interferer; modeling the swept-tone interferer over the observation bandwidth as a magnitude-periodic signal, wherein the magnitude-periodic signal comprises a plurality of phase-rotated pulses, and wherein each of the plurality of phase-rotated pulses comprises a common pulse shape and a distinct phase rotation; generating an energy signal based on the composite signal; estimating a period of the magnitude-periodic signal based on the energy signal; generating an initial estimate of the common pulse shape based on the period and energy detection of the energy signal, wherein a length of the initial estimate of the common pulse shape is equal to the period; generating a plurality of phase estimates based on a plurality of epochs and the initial estimate of the common pulse shape, wherein the plurality of epochs corresponds to non-overlapping, contiguous segments of the composite signal, wherein a length of each of the plurality of epochs is equal to the period, wherein each of the plurality of epochs comprises the common pulse shape, and wherein each of the plurality of phase estimates is generated for each of the plurality of epochs; generating a plurality of phase de-rotated pulse estimates, wherein each of the plurality of phase de-rotated pulse estimates is based on each of the plurality of epochs and each of the plurality of phase estimates; computing a weighted average of the plurality of phase de-rotated pulse estimates to generate a final estimate of the common pulse shape; and generating an estimate of the swept-tone interferer based on the final estimate of the common pulse shape and the plurality of phase estimates.