Chirp-Like Jammer Excision in DSSS Communication Systems Using EMD Based Radon Wigner Distribution

In this paper, the empirical mode decomposition (EMD) is employed for chirp-like jammer excision in direct sequence spread spectrum (DSSS) communication systems. According to the proposed method, the received signal is iteratively decomposed into intrinsic mode functions (IMFs); then we calculate Wigner distribution to IMF in order to yield time frequency spectrum, where the embedded jammer can be well localized in the time-frequency plane. With Radon transform applying to this time frequency spectrum, the parameters of the jammer is estimated and thus the jammer in time domain is restructed. The restructed jammer is excised from the received signal, and the excised signal goes through the detector for a decision. The performance of the proposed method is evaluated in the presence of chirp-like jammer plus Gaussian noise.