NDLI: On quasi-orthogonal signatures for CDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Heath, R.W. Strohmer, T. Paulraj, A.J.
Copyright Year	1963
Abstract	Sum capacity optimal signatures in synchronous code-division multiple-access (CDMA) systems are functions of the codebook length as well as the number of active users. A new signature set must be assigned every time the number of active users changes. This correspondence considers signature sets that are less sensitive to changes in the number of active users. Equiangular signature sequences are proven to solve a certain max-min signal-to-interference-plus-noise problem, which results from their interference invariance. Unions of orthonormal bases have subsets that come close to satisfying the Welch bound. Bounds on the maximum number of bases with minimum maximum correlation are derived and a new construction algorithm is provided. Connections are made between these signature design problems, Grassmannian line packing, frame theory, and algebraic geometry
Sponsorship	IEEE Information Theory Society
Starting Page	1217
Ending Page	1226
Page Count	10
File Size	351874
File Format	PDF
ISSN	00189448
Volume Number	52
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-01
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 Interference Fading Geometry Code division multiplexing Gaussian channels White noise Colored noise Iterative algorithms Circuits Walsh sequences Code-division multiple-access (CDMA) systems
Content Type	Text
Resource Type	Article
Subject	Library and Information Sciences Information Systems Computer Science Applications

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Construction of equiangular signatures for synchronous CDMA systems

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Iterative MAP multi-user detection of synchronous CDMA with channel distortion

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