Title :
Adaptive hybrid acquisition with antenna diversity in CDMA systems
Author :
Lim, Chae-Hyun ; Oh, Hae-Sock ; Han, Dong-Seog ; Cho, Myoung-Je
Author_Institution :
Sch. of Electron. & Electr. Eng., Kyungpook Nat. Univ., Taegu, South Korea
Abstract :
Since existing acquisition systems have a fixed threshold value, they are unable to adapt to varying mobile communication environments. This results in a high false-alarm rate or low detection probability. In this paper, an adaptive hybrid acquisition system that adopts an antenna diversity technique and the cell-averaging constant false alarm rate (CA-CFAR) algorithm is presented to acquire a pseudo-noise (PN) signal for CDMA systems. The CA-CFAR algorithm and an antenna diversity technique are adopted to adjust the decision threshold according to environments and to improve detection performance, respectively. The detection probability, false alarm, rate, miss detection probability, and mean acquisition time in the Rayleigh fading channel are derived and compared to those of the conventional hybrid acquisition system with fixed threshold.
Keywords :
Rayleigh channels; antenna arrays; antenna theory; code division multiple access; diversity reception; mobile radio; pseudonoise codes; signal detection; spread spectrum communication; synchronisation; CA-CFAR; CDMA; CDMA systems; Rayleigh fading channel; adaptive hybrid acquisition; antenna diversity; antenna diversity technique; cell averaging constant false alarm rate; decision threshold; detection performance; detection probability; false-alarm rate; mean acquisition time; miss detection probability; pseudo-noise signal; varying mobile communication environments; Adaptive arrays; Character generation; Correlators; Multiaccess communication;
Conference_Titel :
Military Communications Conference, 2001. MILCOM 2001. Communications for Network-Centric Operations: Creating the Information Force. IEEE
Print_ISBN :
0-7803-7225-5
DOI :
10.1109/MILCOM.2001.986051
