Code Acquisition of a DS/CDMA System with Imperfect Power Control for LEO Mobile Satellite Communica - Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

In this paper, the performance of a parallel acquisition scheme is evaluated for a direct-sequence/codedivision-multiple-access (DS/CDMA) system with imperfect power control in a low-earth-orbit (LEO) mobile satellite environment. The acquisition scheme consists of a parallel matched-filter and a FFT processor. The uplink of mobile satellite channel is modeled as a shadowed Rician fading channel. The acquisition performance is evaluated in terms of mean acquisition time. The effect of power control error is considered in the analysis of acquisition performance. And acquisition-based c a p a c i t y is defined and estimated. It is shown that the power control error causes acquisition to be slower than the case of perfect power control, and for high SNR/chip, the effect of power control error becomes less significant. The better acquisition performance is achieved for the case of high elevation angle compared to that of low elevation angle because the propagation conditions becomes worse as the elevation angle is lower.