Energy Detection of DS-CDMA Signals with Jammer Excision in First Stage

J. Lehtomäki, J. Vartiainen, J. Pyhtilä, and H. Saarnisaari (Finland)


Interference suppression, signal detection, spread spectrum communication


This work studies performance of a two stage inter cept receiver, where the first stage consist of jamming ex cision based on Welch power spectral density estimate and consecutive mean excision (CME). The second stage has energy detector that compares energy in the cleaned sig nal to a threshold. The goal of the first stage is to allow detection of DS-CDMA signals even when strong narrow band signal is present. It is important that false alarm rate is small even when jammer is present and that the probability of detection is large when signal is present (with or with out jammer). The simulation results indicate that the CME algorithm is well suited to be used in association with the intercept receivers.

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