학술논문
Performance of /spl pi//4-shift DQPSK direct-sequence spread-spectrum multiple-access with diversity combining over frequency-selective Rician fading channels
Document Type
Conference
Author
Source
IEEE 43rd Vehicular Technology Conference Vehicular technology conference Vehicular Technology Conference, 1993., 43rd IEEE. :827-830 1993
Subject
Language
ISSN
1090-3038
Abstract
The bit-error-rate (BER) performance of a /spl pi//4-differential quadrature phase shift keying (DQPSK) direct sequence spread spectrum multiple access (DS/SSMA) modem scheme in a digital cellular mobile communication system is analyzed. The system is modeled as a frequency-selective Rician fading channel corrupted by additive white Gaussian noise (AWGN). The correlations of received signals, assumed to be normally distributed, are first obtained, then adopted to average bit error probability. In order to overcome multipath fading effects, the postdetection equal-gain diversity technique is selected. The received baseband signal is composed of specular signals, faded signals by multipath, interferences by other users, and AWGN. The bit-error-rate is finally calculated by numerical integration with the Gold sequence as spread sequence.