In this paper, time-frequency distributions (TFD) are applied for interference excision in spread spectrum communication systems. The focus is on jammers consisting of pulses of constant envelop frequency modulated interference. The time-support and the instantaneous fi-equenq (IF) information provided by rhe TFD are used to reduce the jammer effect on the receiver performance. This is achieved by applying an excision notch filter with a null placed at the interference IF. The filter is turned on and off in synchronous with the inte@erence duty cycle. The bit error rates at different frequencies are given cold compared with those obtained using the multiresolution analyses.
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