Direct Sequence Spread Spectrum Simulation in a CDMA Environment with the Conventional Sliding Correlator
G.G. Koller, M.A. Belkerdid · 1992
A relatively new software package has emerged that facilitates the modeling of Direct Sequence Spread Spectrum (LXSS) systems. The Signal Processing Worksystem with Block Oriented Sofiware Simulator (SPWIBOSS) by Comdisco (l) provides the flexibility of an open architecture and the strength of a vast component library. It was used extemively in this paper to generate models and simulate Code Division Multiple Access (CDMA) systems. The upcoming examples feature data sources andspreading mechanisms designedwith individual Pseudo-Noise (PN) sequence generators with different polynomiul orders, channels containing Additive White Gaussian Noise (AWGN), and receivers made up of ConventionalSliding Correlators (CSC) that are usedas test bed to measure model integrity andperformance trends. Contained within the CSC is a local PN generator with a sequence that matches the targeted transmitter, except for a possiblephase sh@ Further complexity is added to the models by studying the near-farprob1em associated with CDMA systems. These effects are simulated in software by altering the amplitudes of the transmitted signals. simulation results are compared to analyticalpredications.