DIFFERENTIALLY COHERENT DETECTION TECHNIQUE FOR DIRECT-SEQUENCE CODE ACQUISITION IN A RAYLEIGH FADING MOBILE CHANNEL

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Electrical Engineering > journal & Dissertation > Item 987654321/29378

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/29378

Title:	DIFFERENTIALLY COHERENT DETECTION TECHNIQUE FOR DIRECT-SEQUENCE CODE ACQUISITION IN A RAYLEIGH FADING MOBILE CHANNEL
Authors:	CHUNG,CD
Contributors:	電機工程研究所
Keywords:	SPECTRUM PARALLEL ACQUISITION;UNIFIED APPROACH
Date:	1995
Issue Date:	2010-06-29 20:23:10 (UTC+8)
Publisher:	中央大學
Abstract:	A novel differentially coherent (DC) detection scheme for rapid code acquisition is proposed for a direct-sequence (DS) spread-spectrum system being used to communicate over a fast Rayleigh fading mobile radio channel. The scheme processes the received signal at baseband using a complex differential detector with one-chip time delay and then performs a coherent partial correlation of the detector output with the product of a local DS code and its one-chip delayed phase to form a test sample. While stil-1 preserving the pseudo-noise attribute at its output, the differential detector is able to effectively suppress slowly-fluctuating phase components due to fading and carrier frequency offset, thereby enhancing the in-syne correlation at the following correlator. The performance of this detection scheme is analyzed based on a central-limit-theorem argument, and verified by simulation. Both serial and parallel acquisition systems employing the proposed DC detector are compared with the conventional parallel I-Q system by mean acquisition time performance. It is shown that the serial DC acquisition system significantly outperforms the parallel I-Q system in very fast Rayleigh fading environments.
Relation:	IEEE TRANSACTIONS ON COMMUNICATIONS
Appears in Collections:	[Graduate Institute of Electrical Engineering] journal & Dissertation

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