Title :
Probability of acquisition with noncoherent and differentially coherent code acquisition in Doppler
Author :
Iinatti, Jari ; Pouttu, Hi
Author_Institution :
Telecommun. Lab., Oulu Univ., Finland
Abstract :
This paper considers the use of differentially coherent (DC) matched filter (MF) code acquisition in a direct-sequence (DS) spread-spectrum system. An approximate analysis in an AWGN channel and in a Doppler environment is presented. The performance measure is the probability of acquisition, Pacq, during a certain observation interval. The performance is compared to conventional noncoherent (NC) code acquisition. The differentially coherent method requires about 2.5 dB lower signal-to-noise ratio when optimal thresholds are used and no Doppler shift exists. The DC method has a better performance if the normalized Doppler shift is of the order of 0.15 or less
Keywords :
AWGN channels; Doppler shift; approximation theory; filtering theory; matched filters; optimisation; probability; spread spectrum communication; synchronisation; AWGN channel; DS-SS; Doppler environment; acquisition probability; approximate analysis; code synchronization; detection probability; differentially coherent code acquisition; differentially coherent matched filter; direct-sequence spread-spectrum system; noncoherent code acquisition; normalized Doppler shift; observation interval; optimal thresholds; performance; performance measure; signal-to-noise ratio; Delay; Doppler shift; Filtering; Jamming; Laboratories; Matched filters; Multiple access interference; Signal to noise ratio; Spread spectrum communication; Wireless communication;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on
Conference_Location :
Parsippany, NJ
Print_ISBN :
0-7803-6560-7
DOI :
10.1109/ISSSTA.2000.878123
