Title :
Code acquisition in CDMA cellular mobile networks. I. Theory
Author :
Corazza, Giovanni E. ; Polydoros, Andreas
Author_Institution :
Dept. of Electron. Eng., Rome Univ., Italy
Abstract :
The problem of acquiring code synchronization in a CDMA cellular mobile network is addressed in this paper. The fundamental issue is to set a theoretical framework for the analysis of the acquisition subsystem that remains valid in the presence of fading and shadowing effects with specified coherence time. A multi-dwell architecture adopting the MAX/TC criterion is considered, and the acquisition performance is analysed using both the direct approach and the flow-graph approach. Expressions for the acquisition time probability density function under different assumptions are given. The conditions under which the Markovian nature of the acquisition procedure can be assumed to be preserved in a fading channel are discussed. Closed form expressions for the mean and variance of the acquisition time are reported
Keywords :
Markov processes; cellular radio; code division multiple access; fading channels; synchronisation; CDMA cellular mobile networks; MAX/TC criterion; Markov acquisition procedure; acquisition performance; acquisition subsystem; closed form expressions; code acquisition; coherence time; direct approach; fading; fading channel; flow-graph approach; mean; multi-dwell architecture; probability density function; shadowing effects; variance; Cellular networks; Delay estimation; Fading; Fingers; Intelligent networks; Mobile communication; Multiaccess communication; Shadow mapping; Testing; Uncertainty;
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.1998.723825
