Title :
Performance improvement of CDMA/QPSK systems with nonlinear channel using decision feedback equalizers
Author :
Kusaka, Hiroji ; Kominami, Masanobu ; Matsumoto, Keiji ; Tashiro, Yasutaka
Author_Institution :
Dept. of Inf. Syst. Eng., Osaka Sangyo Univ., Japan
Abstract :
This paper proposes an improvement method of the performance characteristics of a quadriphase phase-shift-keyed code-division multiple-access (CDMA/QPSK) system with a nonlinear channel such as a satellite repeater which consists of a traveling-wave tube (TWT). Two adaptive decision feedback equalizers are used to improve the system performance degraded by the nonlinear channel. From calculation results, it is shown that the degradations are improved considerably
Keywords :
AWGN channels; adaptive equalisers; code division multiple access; decision feedback equalisers; quadrature phase shift keying; satellite communication; CDMA/QPSK systems; adaptive decision feedback equalizers; decision feedback equalizers; degradation; nonlinear channe; performance improvement; quadriphase phase-shift-keyed code-division multiple-access; satellite repeater; traveling-wave tube; Additive white noise; Artificial satellites; Decision feedback equalizers; Degradation; Gaussian noise; Multiaccess communication; Quadrature phase shift keying; System performance; Systems engineering and theory; Transponders;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on
Conference_Location :
Sun City
Print_ISBN :
0-7803-4281-X
DOI :
10.1109/ISSSTA.1998.722491
