Title :
Mobile satellite CDMA system robust to Doppler shift
Author :
Kajiwara, Akihiro
Author_Institution :
Dept. of Syst. & Comput. Sci. Eng., Carleton Univ. Ottawa, Ont., Canada
Abstract :
A novel detection scheme for mobile satellite CDMA (code division multiple access) personal communications is proposed. This dual-channel detector employing dual-channel signal processing can provide absolutely invariant system performance to Doppler shift of a carrier and local oscillator instability. In CDMA channels, the detector can provide good performance without pilot tone transmission and self-synchronizing circuits combined with poor transmission efficiency and demodulation loss. At C/N.Ws higher than 20 dB, the degradation as compared with a CPSK (coherent phase shift keying) detector with perfect carrier recovery is less than 25%. However, this degradation is significantly less than the loss incurred by pilot tone transmission, Doppler shift, and phase jitter
Keywords :
Doppler shift; cellular radio; code division multiple access; frequency stability; jitter; mobile satellite communication; personal communication networks; signal detection; spread spectrum communication; Doppler shift; code division multiple access; dual-channel detector; dual-channel signal processing; local oscillator instability; mobile satellite CDMA; performance; personal communications; phase jitter; pilot tone transmission; Artificial satellites; Degradation; Detectors; Doppler shift; Local oscillators; Multiaccess communication; Propagation losses; Robustness; Signal processing; System performance;
Conference_Titel :
Communications, 1993. ICC '93 Geneva. Technical Program, Conference Record, IEEE International Conference on
Conference_Location :
Geneva
Print_ISBN :
0-7803-0950-2
DOI :
10.1109/ICC.1993.397304
