Non-stationary interference exciser in smart antenna systems using an adaptive Gabor expansion

Since smart antenna systems which employ spread spectrum methods are sensitive to a time-correlated non-stationary jammer precise excision of the jammer is required. To remove this non-stationary jammer, we propose, a new adaptive Gabor jammer exciser, which can track optimally the change of the time and frequency densities of the jammer. To find the optimum time-frequency Gabor expansion for the received signal, we utilize the optimum projection method. In the time-frequency Gabor domain, we remove the non-stationary jammer with a constant false alarm rate, and reconstruct the jammer-removed signal from the remaining Gabor coefficients. This approach exhibits better performance than the non-optimized Gabor transform exciser