Spectral redundancy exploitation in narrow band interferencerejection for a PN-BPSK system

摘要

Different techniques have been proposed to excise narrow bandninterference from a direct sequence spread spectrum signal. One suchntechnique is the frequency domain threshold exciser (THE). The THEnestimates the spectrum of the received signal and weights the frequencynbins appropriately. One disadvantage of this technique is that the powernof the signal of interest (SOI) also gets reduced and thus the number ofnnarrow-band interferers that can be excised is limited. This papernproposes a new technique which makes use of the spectral redundancynbetween the sidebands of the PN-BPSK signal to obtain a better estimatenof the spectral energy of the SOI, by replacing corrupted spectralnestimates with uncorrupted and correlated estimates. This spectralnredundancy exploiting interference suppressor (SPREIS) provides improvednperformance over the THE with a small increase in the computationalncomplexity. Simulation results are presented