Methods and systems for mitigating signal interference

摘要

A received signal that includes a target signal and an interference signal is sampled in space and time and then filtered into a matched-filtered signal and into a mis-matched-filtered signal, which is orthogonal to, or nearly orthogonal to, the matched-filtered signal The interference signal is present in both the matched-filtered signal and the mis-matched-filtered signal, whereas the target signal is present in only the matched-filtered signal. In the mis-matched-filtered signal, the interference signal is different from the matched-filtered signal in the temporal property, but is the same as the matched-filtered signal in the spatial property. After the matched-filtered signal and the mis-match-filtered signals have been obtained for the signals received by each antenna element of an array of antenna elements, they are processed to obtain a result vector, W, that is a representation of the target signal without the interference.

主权项

1. A system for mitigating electromagnetic interference, the system comprising:
an array of N spatially-separated antenna elements, where N is a positive integer that is greater than or equal to 2; at least one analog electrical circuit arranged to receive an electrical signal from a respective antenna element of the N spatially separated antenna elements, split the electrical signal into a first electrical signal and a second electrical signal, the analog electrical circuit introducing a first reference signal having a first modulation that is matched to a target signal and a second reference signal having a second modulation that is mis-matched to the target signal and mixing the first reference signal with one of the first electrical signal and the second electrical signal and mixing the second reference signal with the remaining one of the first electrical signal and the second electrical signal; and a processing circuit arranged to receive a matched signal and a mis-matched signal from the at least one analog electrical circuit, wherein a respective target signal and a respective interference signal that are part of the respective received electrical signal are present in the matched signal and wherein the interference signal, but not the target signal, is present in the mis-matched signal, and wherein the processing circuit generates a result vector, W, that is a representation of the target signal without the interference signal.