A discrete pseudo Wigner distribution spread spectrum detection procedure employing complex spreading sequences

An efficient quadratic time-frequency (TF) discrete pseudo Wigner distribution (DPWD) based detection procedure is proposed for utilisation in direct sequence spread spectrum (DSSS) receivers. A class of complex generalised chirp-like (GCL) perfect-squares minimum-phase constant-amplitude-zero-autocorrelation (PS-MP CAZAC) signature or spreading sequences is employed to facilitate communications in a code division multiple access (CDMA) environment. It is shown that the new detection procedure, based on a computationally efficient DPWD algorithm, is equivalent to integrating the WD of the GCL spreading sequences along their respective lines of instantaneous frequency (IF). A simple DPWD aided frame synchronisation technique is also introduced. Simulation results of the WD scheme are presented to demonstrate the applicability and versatility of the proposed technique compared to conventional correlation-based methods.