DocumentCode
912609
Title
Spread spectrum mobile radio, 1977-1982
Author
Yue, On-Ching
Author_Institution
Bell Laboratories, Holmdel, NJ
Volume
32
Issue
1
fYear
1983
fDate
2/1/1983 12:00:00 AM
Firstpage
98
Lastpage
105
Abstract
In 1977, Cooper and Nettleton proposed a spread spectrum mobile radio system using frequency-hopping multiple access, Hadamard coding for error correction, and differential phase shift keyed (DPSK) modulation, and they claimed higher spectral efficiency than frequency-division (FD) FM systems. Subsequent analyses showed that the DPSK system has a spectral efficiency of 8.4 percent as compared to the efficiency of unity for a FD-FM system with 30-kHz channel spacings. Goodman et al. suggested an alternative modulation scheme in 1980, using multilevel frequency shift keying (MFSK), and a 30 percent efficiency was obtained. The research results in spread spectrum mobile radio are summarized, and the areas requiring further investigation before a commercial system can be implemented are identified.
Keywords
Channel spacing; Differential quadrature phase shift keying; Error correction; Error correction codes; Frequency modulation; Frequency shift keying; Land mobile radio; Modulation coding; Phase modulation; Spread spectrum communication;
fLanguage
English
Journal_Title
Vehicular Technology, IEEE Transactions on
Publisher
ieee
ISSN
0018-9545
Type
jour
DOI
10.1109/T-VT.1983.23949
Filename
1623079
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