Work

On quasi-orthogonal signatures for CDMA systems

Year: 2006

Type: article

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

Source: IEEE Transactions on Information Theory

DOI: 10.1109/tit.2005.864469

Authors: R.W. Heath, T. Strohmer, A.J. Paulraj

Institutions: University of California, Davis, The University of Texas at Austin, Stanford University

Language: English

Topic: Wireless Communication Networks Research

Subfield: Computer Networks and Communications

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Imperial College London

OpenAlex ID: W2123618483