Bit error probability of a large jammer cancellation system
Abstract
A nonlinear jammer cancellation system is described and analyzed. The system uses a bandpass limiter to estimate the jammer carrier and a lowpass filter to estimate the jammer amplitude. The jammer amplitude is multiplied with the jammer carrier estimate to obtain the jammer estimate. This estimate is subtracted from the incoming signal to form the estimate of the desired signal. This quantity is input to a despreader and data detector to detect the sign of the biphasemodulated data bit. It is shown that the amount of cancellation increases as the incoming jammer power increases relative to the signal and noise power, due to the small error in estimating the jammer waveform. The bit error probabilities for the coherent detector both with and without the cancellation system are plotted and discussed.
 Publication:

NTC 1978; National Telecommunications Conference, Volume 3
 Pub Date:
 1978
 Bibcode:
 1978ntc.....3...35L
 Keywords:

 Bandpass Filters;
 Cancellation Circuits;
 Communication Satellites;
 Jammers;
 Signal Processing;
 Bandwidth;
 Error Signals;
 Frequency Modulation;
 Low Pass Filters;
 Nonlinear Systems;
 Phase Shift Keying;
 Probability Density Functions;
 Random Noise;
 Random Variables;
 Signal Detectors;
 Signal Reception;
 Signal To Noise Ratios;
 Communications and Radar