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The Synchronization Acquisition of MAry/SS Communication System with Differential Detector
Nozomu HISHINAGA Yoshihiro IWADARE
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E80A
No.12
pp.23892397 Publication Date: 1997/12/25 Online ISSN:
DOI: Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications) Category: Keyword: Mary/spreadspectrum communication system, differential decoding, Sylvester type Hadamard matrix, M sequence type Hadamard matrix, Sylvester's expansion,
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Summary:
It is well known that Mary/spread spectrum (Mary/SS) system is superior to directsequence spread spectrum system under AWGN, and can achieve high spectral efficiency. On the other hand, however, the main drawback of this system is that the synchronization acquisition is difficult. In this paper, we propose a new synchronization acquisition method of Mary/SS system. This method acquires the code synchronization by introducing a symmetrical property in spreading sequences, and detecting this property with the differential decoding technique. As spreading sequences, a set of orthogonal sequences and a set of nonorthogonal sequences are considered. The strong features of proposed systems are that the systems can acquire the code synchronization in carrier band and can reduce the complexity of calculation greatly. Among the comparison results of the systems with newly proposed orthogonal and some specific nonorthogonal spreading sequences, it is especially noted that the latter can reduce the mean acquisition time and calculation complexity much greater than the former.

