The theoretical bandwidth advantage of CDMA over FDMA in a gaussian MAC

Biao Chen; Peter Willett

doi:10.1109/18.782131

The theoretical bandwidth advantage of CDMA over FDMA in a gaussian MAC

Biao Chen, Peter Willett

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

4 Scopus citations

Abstract

We develop an expression for the minimum extra bandwidth needed for a frequency-division multiple-access (FDMA) system to outperform its code-division (CDMA) counterpart uniformly (that is, for all rate n-tuples) in a Gaussian multiple-access channel (MAC). For equalpower sources, the behavior of this factor is as an iterated logarithm of the number of users; hence it increases slowly yet is unbounded. Asymmetric power cases are also studied and it was shown that the equal power scenario provides the least bandwidth expansion factor assuming constant constraint on total power.

Original language	English (US)
Pages (from-to)	2046-2053
Number of pages	8
Journal	IEEE Transactions on Information Theory
Volume	45
Issue number	6
DOIs	https://doi.org/10.1109/18.782131
State	Published - 1999
Externally published	Yes

Keywords

CDMA
Capacity region
FDMA
MAC

ASJC Scopus subject areas

Information Systems
Computer Science Applications
Library and Information Sciences

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10.1109/18.782131

Cite this

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title = "The theoretical bandwidth advantage of CDMA over FDMA in a gaussian MAC",

abstract = "We develop an expression for the minimum extra bandwidth needed for a frequency-division multiple-access (FDMA) system to outperform its code-division (CDMA) counterpart uniformly (that is, for all rate n-tuples) in a Gaussian multiple-access channel (MAC). For equalpower sources, the behavior of this factor is as an iterated logarithm of the number of users; hence it increases slowly yet is unbounded. Asymmetric power cases are also studied and it was shown that the equal power scenario provides the least bandwidth expansion factor assuming constant constraint on total power.",

keywords = "CDMA, Capacity region, FDMA, MAC",

author = "Biao Chen and Peter Willett",

note = "Funding Information: Manuscript received January 2, 1998; revised January 2, 1999. This work was supported in part by NUWC, Newport, under Contract N66604-97-M-3139 and by the Office of Naval Research under Contract N00014-98-1-0049. The material in this correspondence was presented in part at the 1997 Conference on Information Sciences and Systems, Baltimore, MD, March 1997. B. Chen was with U-157, University of Connecticut, Storrs, CT 06269 USA. He is now with Cornell University, Ithaca, NY 14853 USA. P. Willett is with U-157, University of Connecticut, Storrs, CT 06269 USA (e-mail: [email protected]). Communicated by S. Shamai, Associate Editor for Shannon Theory. Publisher Item Identifier S 0018-9448(99)05866-6.",

year = "1999",

doi = "10.1109/18.782131",

language = "English (US)",

volume = "45",

pages = "2046--2053",

journal = "IEEE Transactions on Information Theory",

issn = "0018-9448",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - The theoretical bandwidth advantage of CDMA over FDMA in a gaussian MAC

AU - Chen, Biao

AU - Willett, Peter

N1 - Funding Information: Manuscript received January 2, 1998; revised January 2, 1999. This work was supported in part by NUWC, Newport, under Contract N66604-97-M-3139 and by the Office of Naval Research under Contract N00014-98-1-0049. The material in this correspondence was presented in part at the 1997 Conference on Information Sciences and Systems, Baltimore, MD, March 1997. B. Chen was with U-157, University of Connecticut, Storrs, CT 06269 USA. He is now with Cornell University, Ithaca, NY 14853 USA. P. Willett is with U-157, University of Connecticut, Storrs, CT 06269 USA (e-mail: [email protected]). Communicated by S. Shamai, Associate Editor for Shannon Theory. Publisher Item Identifier S 0018-9448(99)05866-6.

PY - 1999

Y1 - 1999

N2 - We develop an expression for the minimum extra bandwidth needed for a frequency-division multiple-access (FDMA) system to outperform its code-division (CDMA) counterpart uniformly (that is, for all rate n-tuples) in a Gaussian multiple-access channel (MAC). For equalpower sources, the behavior of this factor is as an iterated logarithm of the number of users; hence it increases slowly yet is unbounded. Asymmetric power cases are also studied and it was shown that the equal power scenario provides the least bandwidth expansion factor assuming constant constraint on total power.

AB - We develop an expression for the minimum extra bandwidth needed for a frequency-division multiple-access (FDMA) system to outperform its code-division (CDMA) counterpart uniformly (that is, for all rate n-tuples) in a Gaussian multiple-access channel (MAC). For equalpower sources, the behavior of this factor is as an iterated logarithm of the number of users; hence it increases slowly yet is unbounded. Asymmetric power cases are also studied and it was shown that the equal power scenario provides the least bandwidth expansion factor assuming constant constraint on total power.

KW - CDMA

KW - Capacity region

KW - FDMA

KW - MAC

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JO - IEEE Transactions on Information Theory

JF - IEEE Transactions on Information Theory

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ER -

The theoretical bandwidth advantage of CDMA over FDMA in a gaussian MAC

Abstract

Keywords

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