Title :
Adaptive double-dwell PN code acquisition in direct-sequence spread-spectrum systems
Author :
Oh, Hac-Sock ; Han, Dong-Seog ; Park, Kil-Houm ; Lim, Chang-Heon
Author_Institution :
Sch. of Electron. & Electr. Eng., Kyungpook Nat. Univ., Taegu, South Korea
Abstract :
An adaptive double-dwell acquisition system of pseudo-noise (PN) sequences is presented for direct-sequence spread-spectrum (DS-SS) systems. Since existing acquisition systems have a fixed threshold value, they are unable to adapt to various mobile communications environments. Accordingly, this results in a high false alarm rate or low detection probability. Therefore, an adaptively varying threshold scheme is proposed through the use of a constant false alarm rate (CFAR) algorithm. By deriving formulas for the detection probability and false alarm rate of the proposed adaptive system, its performance was analyzed and compared to an existing one. The results showed that the proposed adaptive double-dwell acquisition system. Provides a better performance than conventional systems
Keywords :
AWGN channels; adaptive codes; land mobile radio; probability; pseudonoise codes; sequences; signal detection; spread spectrum communication; synchronisation; CFAR algorithm; DS-SS systems; PN sequences; adaptive double-dwell PN code acquisition; adaptive system; adaptively varying threshold; constant false alarm rate; detection probability; direct-sequence spread-spectrum systems; mobile communications; nonfading AWGN channel; performance analysis; pseudo-noise sequences; 3G mobile communication; Adaptive systems; Detectors; Hardware; Matched filters; Military communication; Mobile communication; Performance analysis; Quality of service; Spread spectrum communication;
Conference_Titel :
MILCOM 2000. 21st Century Military Communications Conference Proceedings
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-7803-6521-6
DOI :
10.1109/MILCOM.2000.904928
