Multiple jammer cancelation in Spectrally-Encoded Spread-Time asynchronous CDMA system: Matched & partially-matched schemes

In this paper, we study and analyze the performance of matched and partially-matched receivers for a typical ultra wide-band Spectrally-Encoded Spread-Time (SE/ST) CDMA in the presence of multiple tone jammers. We investigate a scenario where there is no information about the jammer frequencies in the transmitter side while it is desirable to cancel it in the receiver side. We will demonstrate the performance of the SE/ST system would be improved through partially matched filter at the receiver. In addition, we approximate the two-dimensional RAKE receiver by a simple one-dimensional RAKE for the scenario where there are K asynchronous users. Furthermore, closed form formula for the characteristic function of the decision variable will be found and used to evaluate the probability of error. Our numerical results show that the partially-matched receiver outperforms the conventional matched filter in case of high jammer to signal power ratio.