Title :
Optimal Codes and Filters for Hard-Limited OQPSK/DS Multiple Access Systems
Author :
Elhakeen, A.K. ; Hafez, H.M. ; Ghafar, A.Abel
Abstract :
The worst case detectability is optimized with respect to the combined choice of the Spread Spectrum (SS) codes and receiver filters in a hard limited multi-access system. The multi-access repeater with a hard limiter will provide access to a group of n SS users, each employing pseudorandom (i.e. direct sequence DS) codes in the inphase (I) and quadrature (Q) channels of the offset Quadrature Phase Shift Keying OQPSK/DS system. Both like user interference and AWGN will be considered. Maximal linear codes, Gold, and Kassami codes of different lengths and raised cosine, Gaussian, Butterworth and Chebyshev band-pass filters of different shapes will form the set of the maximizing parameters.
Keywords :
AWGN; Band pass filters; Chebyshev approximation; Gold; Interference; Linear code; Quadrature phase shift keying; Repeaters; Shape; Spread spectrum communication;
Conference_Titel :
Military Communications Conference - Progress in Spread Spectrum Communications, 1982. MILCOM 1982. IEEE
DOI :
10.1109/MILCOM.1982.4805922