NDLI: Partitioning of spreading sequences for increased minimum distance using CPFSK modulation

Content Provider	IEEE Xplore Digital Library
Author	Fulghum, T.L. Miller, S.L.
Copyright Year	1972
Abstract	By using continuous-phase frequency shift keying (CPFSK) in a direct-sequence code-division multiple-access (DS-CDMA) system, and by partitioning the spreading sequence so that differing patterns of plus and minus chips are multiplied onto successive data bits, the net phase change will differ from bit to bit, giving an apparent variation in modulation index similar to multi-h CPFSK. This gives similar coding gain effects as multi-h CPFSK when maximum-likelihood sequence detection is used. Improved probability of error performance in terms of increased minimum distance has been demonstrated when the spreading sequence of a CDMA system is properly overlaid on outgoing data bits in the CPFSK modulation scheme. At the best modulation index observed, h=5/7, a computer search shows /spl sim/1.4-dB advantage over binary phase shift keying, and a /spl sim/0.6-dB advantage over the best fixed-h CPFSK.
Starting Page	493
Ending Page	497
Page Count	5
File Size	79174
File Format	PDF
ISSN	00906778
Volume Number	47
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Frequency shift keying Continuous phase modulation Spread spectrum communication Demodulation Multiple access interference Modulation coding Maximum likelihood detection Computer errors Binary phase shift keying
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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