This paper presents a new adaptation algorithm using parallel subfilter structure, which enables fast-code acquisition for direct-sequence spread-spectrum systems. The proposed algorithm adapts the filter, based on a concept of dividing it into several subfilters, thus reducing the adaptation time. The detection and false-alarm probabilities are derived analytically. Simulation results show that the adaptive code-acquisition scheme, using the proposed algorithm, improves the mean-acquisition-time performance by 4-5 and 3-4 dB on additive white Gaussian noise and multipath Rayleigh fading channels for 64 taps, respectively.
Bibliographical noteFunding Information:
Manuscript received June 3, 2005; revised October 10, 2005, February 13, 2006, and February 26, 2006. This work was supported in part by the Ministry of Information and Communication, Korea, under the Information Technology Research Center support program supervised by the Institute of Information Technology Assessment. This work was also supported in part by the Ministry of Education and Human Resources Development, the Ministry of Commerce, Industry, and Energy, and the Ministry of Labor, through the fostering project of the Lab of Excellency. The review of this paper was coordinated by Prof. J. H. Cho.
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics