Orthogonal multiple access over time- and frequency-selective channels

Geert Leus; Shengli Zhou; Georgios B. Giannakis

doi:10.1109/TIT.2003.814477

Orthogonal multiple access over time- and frequency-selective channels

Geert Leus, Shengli Zhou, Georgios B. Giannakis

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

Suppression of multiuser interference (MUI) and mitigation of time- and frequency-selective (doubly selective) channel effects constitute major challenges in the design of third-generation wireless mobile systems. Relying on a basis expansion model (BEM) for doubly selective channels, we develop a channel-independent block spreading scheme that preserves mutual orthogonality among single-cell users at the receiver. This alleviates the need for complex multiuser detection, and enables separation of the desired user by a simple code-matched channel-independent block despreading scheme that is maximum-likelihood (ML) optimal under the BEM plus white Gaussian noise assumption on the channel. In addition, each user achieves the maximum delay-Doppler diversity for Gaussian distributed BEM coefficients. Issues like links with existing multiuser transceivers, existence, user efficiency, special cases, backward compatibility with direct-sequence code-division multiple access (DS-CDMA), and error control coding, are briefly discussed.

Original language	English (US)
Pages (from-to)	1942-1950
Number of pages	9
Journal	IEEE Transactions on Information Theory
Volume	49
Issue number	8
DOIs	https://doi.org/10.1109/TIT.2003.814477
State	Published - Aug 2003

Bibliographical note

Funding Information:
Manuscript received July 2, 2001; revised January 28, 2003. This work was supported by the FWO–Flanders (Belgium), the ARL/CTA under Grant DAAD19-01-2-011, and the National Science Foundation Wireless Initiative under Grant ECS-9979443. The material in this paper was presented in part at the 35th Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, November 2001 and at IEEE GLOBECOM, San Antonio, TX, November 2001.

Keywords

Delay diversity
Doppler diversity
Multiple access
Multiuser detection
Time- and frequency-selective channels

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abstract = "Suppression of multiuser interference (MUI) and mitigation of time- and frequency-selective (doubly selective) channel effects constitute major challenges in the design of third-generation wireless mobile systems. Relying on a basis expansion model (BEM) for doubly selective channels, we develop a channel-independent block spreading scheme that preserves mutual orthogonality among single-cell users at the receiver. This alleviates the need for complex multiuser detection, and enables separation of the desired user by a simple code-matched channel-independent block despreading scheme that is maximum-likelihood (ML) optimal under the BEM plus white Gaussian noise assumption on the channel. In addition, each user achieves the maximum delay-Doppler diversity for Gaussian distributed BEM coefficients. Issues like links with existing multiuser transceivers, existence, user efficiency, special cases, backward compatibility with direct-sequence code-division multiple access (DS-CDMA), and error control coding, are briefly discussed.",

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Orthogonal multiple access over time- and frequency-selective channels

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Keywords

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