Transform-selective interference suppression algorithm for spread-spectrum communications

Abstract

An adaptive method for suppressing interference with an unknown model is presented. The method is based on computation of several transforms in parallel and selecting the most suitable one depending on a priori unknown the interference type based on a compression gain (CG) metric, which is related to the interference concentration in the transform domain. It is also possible to estimate the a priori parameters required by some transforms. The method can be expanded to utilize an arbitrary number of transforms. It is shown through computer simulations that the CG is a good metric for choosing the proper domain for interference excision.

A Minimum Value Based Threshold Setting Strategy for Frequency Domain Interference Excision

“…Note that the performance enhancement of the proposed strategy partially comes at the cost of reduced adaptability to nonstationary interferences, depending on the number of coefficient records involved in calculating . For future research direction, the transplant of this strategy into other transform domains where some wideband nonstationary jammers are well localized [13], [14] could be studied. Another potential limitation is that the calculation of calls for additional memory to keep .…”

Pulsed and narrowband mixed interference mitigation technique for single antenna GNSS receivers

“…Periodic-pulsed interference (PPI) and narrowband interference (NBI) are two types of detrimental interference for Global Navigation Satellite System (GNSS) receivers [1] and the immunity of single antenna GNSS receivers against PPI and NBI can be greatly enhanced by the corresponding mitigation techniques [2,3,4]. The typically PPI sources for GNSS receivers are transmitted from DME/TACAN, primary L-band radars, AEW&C L-band radars and TADIL-J/Link-16 [5].…”