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Double MAry/Spread Spectrum Communication Systems
Kentaro TAKEUCHI Masanori HAMAMURA Sin'ichi TACHIKAWA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E81A
No.10
pp.20642072 Publication Date: 1998/10/25 Online ISSN:
DOI: Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications) Category: Spread Spectrum System Keyword: spread spectrum, Mary/SS, double Mary/SS, spectral efficiency,
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Summary:
In this paper, to obtain higher spectral efficiency than a conventional Mary/Spread Spectrum (SS) communication system using an orthogonal code, we propose Double Mary/SS communication systems in which transmitting sequences are produced by multiplying two sequences obtained from different Mary/SS systems. First, we estimate the system performance of a Double Mary/SS in which transmitting sequences are composed of two kinds of sequences which have the same chip duration and the same sequence length in AWGN environment by theoretical analysis and computer simulations using random sequences. And we show that the bit error rate (BER) of the system can be improved, compared to that of the conventional Mary/SS. Next, we propose two concrete examples of the Double Mary/SS systems. We investigate the performance of these systems in AWGN environment by computer simulations, and show that the BER and spectral efficiency can be improved by the two systems compared to those of the conventional Mary/SS. Further, we consider a modified method of the demodulation for one of the examples of Double Mary/SS systems, and show that we can reduce quantity of calculations by the method.


