Title :
A discrete pseudo Wigner distribution spread spectrum detection procedure employing complex spreading sequences
Author :
van Wyk, D.J. ; Linde, L.P.
Author_Institution :
Dept. of Electr. & Electron. Eng., Pretoria Univ., South Africa
Abstract :
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
Keywords :
Wigner distribution; code division multiple access; correlation methods; pseudonoise codes; radio receivers; sequences; signal detection; spread spectrum communication; synchronisation; time-frequency analysis; CDMA; DSSS; algorithm; code division multiple access; constant amplitude zero autocorrelation signature; direct sequence spread spectrum receivers; discrete pseudo Wigner distribution; frame synchronisation; instantaneous frequency; perfect-squares minimum-phase signature; quadratic time-frequency distribution; simulation results; spread spectrum detection; spreading sequences; Africa; Autocorrelation; Chirp; Computational modeling; Frequency synchronization; Gold; Multiaccess communication; Spread spectrum communication; Time division multiple access; Time frequency analysis;
Conference_Titel :
Communications and Signal Processing, 1994. COMSIG-94., Proceedings of the 1994 IEEE South African Symposium on
Conference_Location :
Stellenbosch
Print_ISBN :
0-7803-1998-2
DOI :
10.1109/COMSIG.1994.512433