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Design of high-speed preamble searcher adequate for RACH preamble structure in WCDMA reverse link receiver  

정은선 (성균관대학교 정보통신공학부)
도주현 (성균관대학교 정보통신공학)
이영용 (삼성전자 TN총괄 통신연구)
정성현 (에이로직스 정보통신연구)
최형진 (성균관대학교 정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.8A, 2004 , pp. 898-908 More about this Journal
Abstract
In this paper, we propose a high speed preamble searcher feasible for RACH(Random Access Channel) preamble structure in WCDMA reverse link receiver. Unlike IS-95, WCDMA system uses AISMA(Acquisition Indication Sense Multiple Access) process. Because of the time limit between RACH preamble transmission and AI(Acquisition Indicators), and the restriction on the number of RACH signatures assigned to RACH preamble, fast acquisition indication is required for efficient operation. The preamble searcher proposed in this paper is based on 2-antenna system and has adopted FHT algorithm that has the radix-2 16 point FFT structure. The acquisition speed using FHT is 64 times faster than the conventional method that correlates each signature. Based on their fast aquisition scheme, we improved the acquisition performance by calculating the correlation up to the 4096 chips of the total preamble length. The performance is analyzed by using Neyman-pearson method. The proposed algorithm has been applied for the implementation of WCDMA reverse link receiver modem successfully.
Keywords
WCDMA reverse link; PRACH; Preamble searcher; FHT; AISMA; Fast acquisition;
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