Rapid Acquisition in Direct-Sequence/Spread-Spectrum Systems

ISBN-13: 9783639191936 / Angielski / Miękka / 2009 / 164 str.

Fabio Principe

Opis

This book tackles the issue of the rapid acquisition of spreading codes in Direct-Sequence/Spread-Spectrum systems. In particular, a new algorithm is proposed that exploits the experience of the iterative decoding of modern codes to detect these sequences. This new method is a Message-Passing-based algorithm. Specifically, instead of correlating the received signal with local replicas of the transmitted Linear-Feedback-Shift-Register sequence, an iterative Message-Passing (MP) algorithm is implemented to be run on a loopy graph. Thus, this work is an analysis of the detection technique based on MP algorithms to acquire m-Sequences and Gold codes. In detail, an unified treatment to design and implement a specific set of graphical models for these codes is reported. A theoretical study on the acquisition time performance and the comparison to the standard algorithms is done. A preliminary architectural design is also provided. Finally, the analysis is also enriched by comparing this new technique to the standard algorithms in terms of computational complexity and (missed/wrong/correct) acquisition probabilities as derived by simulations.

O autorze

F. Principe received the PhD grade in Information Engineering from the University of Pisa. He collaborated with INTECS SpA and LABEN SpA. He also spent 7 months at the Communication Sciences Institute USC, in Los Angeles. Currently, he works in IDS SpA. His research interests lie in the broad area of communication and satellite positioning systems.