Title :
Effect of nonlinearities on spread spectrum communications systems
Author :
Demirkiran, I. ; Weiner, D.D. ; Varshney, P.K. ; Drozd, A.S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Syracuse Univ., NY, USA
Abstract :
While the performance of direct sequence spread spectrum systems have been studied extensively, the effect of nonlinearities on system performance has received limited attention. This paper addresses the performance of direct sequence spread spectrum systems employing a nonlinear amplifier. Inter-modulation products due to nonlinear amplification are analyzed and the effect of nonlinearities is illustrated by means of a simulation result. In the simulation a third-order nonlinear amplifier is used to represent the nonlinearity. Third-order inter-modulation terms which fall in the desired signal frequency band are shown to degrade system performance.
Keywords :
intermodulation; nonlinear systems; power amplifiers; radio receivers; radiofrequency amplifiers; spread spectrum communication; DS-SS; direct sequence spread spectrum systems; inter-modulation products; interference rejection; nonlinear amplification; nonlinearities effect; receiver nonlinearities; signal frequency band; signal representation; simulation result; spread spectrum communications systems; system performance; third-order nonlinear amplifier; Degradation; Ear; Interference; Linearity; Multiaccess communication; Performance analysis; Radio frequency; Radiofrequency amplifiers; Spread spectrum communication; System performance;
Conference_Titel :
Signals, Systems & Computers, 1998. Conference Record of the Thirty-Second Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5148-7
DOI :
10.1109/ACSSC.1998.751627
