On The Impact of Time-Varying Interference-Channel on the Spatial Approach of Spectrum Sharing between S-band Radar and Communication System

摘要

Spectrum sharing is a new approach to solve the congestion problem in the RFspectrum. A spatial approach for spectrum sharing between a radar and acommunication system was proposed, which mitigates the radar interference tocommunication by projecting the radar waveform onto the null space of theinterference channel, between radar and communication system [1]. In this work,we extend this approach to a maritime MIMO radar which experiences a timevarying interference channel due to the oscillatory motion of a ship, becauseof the breaking of sea/ocean waves. We model this variation by using the matrixperturbation theory and the statistical distribution of the breaking waves.This model is then used to study the impact of perturbed interference channelon the spatial approach of spectrum sharing. We use the maximum likelihood (ML)estimate of a target's angle of arrival to study the radar's performance whenits waveform is projected onto the null space of the perturbed interferencechannel. Through our analytical and simulation results, we study the loss inthe radar's performance due to the null space projection (NSP) of its waveformon the perturbed interference channel.