On the average near-far resistance for MMSE detection of direct sequence CDMA signals with random spreading

Upamanyu Madhow; Michael L. Honig

doi:10.1109/18.782129

On the average near-far resistance for MMSE detection of direct sequence CDMA signals with random spreading

Upamanyu Madhow^*, Michael L. Honig

^*Corresponding author for this work

Electrical and Computer Engineering

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

53 Scopus citations

Abstract

The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.

Original language	English (US)
Pages (from-to)	2039-2045
Number of pages	7
Journal	IEEE Transactions on Information Theory
Volume	45
Issue number	6
DOIs	https://doi.org/10.1109/18.782129
State	Published - 1999

Keywords

Cdma (code-division multiple access)
Direct sequence
Interference suppression
Multiuser detection
Random signature sequence
Spread spectrum

ASJC Scopus subject areas

Information Systems
Computer Science Applications
Library and Information Sciences

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title = "On the average near-far resistance for MMSE detection of direct sequence CDMA signals with random spreading",

abstract = "The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.",

keywords = "Cdma (code-division multiple access), Direct sequence, Interference suppression, Multiuser detection, Random signature sequence, Spread spectrum",

author = "Upamanyu Madhow and Honig, {Michael L.}",

note = "Funding Information: Manuscript received February 23, 1996; revised May 22, 1998. The work of U. Madhow was supported in part by the Office of Naval Research under Grant N00014-95-1-0647. The work of M. L. Honig was supported in part by the Army Research Office under Grant DAAH04-96-1-0378. The material in this correspondence was presented in part at the 1993 IEEE International Symposium on Information Theory, San Antonio, TX, January 17–22, 1993.",

year = "1999",

doi = "10.1109/18.782129",

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AU - Honig, Michael L.

N1 - Funding Information: Manuscript received February 23, 1996; revised May 22, 1998. The work of U. Madhow was supported in part by the Office of Naval Research under Grant N00014-95-1-0647. The work of M. L. Honig was supported in part by the Army Research Office under Grant DAAH04-96-1-0378. The material in this correspondence was presented in part at the 1993 IEEE International Symposium on Information Theory, San Antonio, TX, January 17–22, 1993.

PY - 1999

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N2 - The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.

AB - The performance of a near-far-resistant, finite-complexity, minimum mean squared error (MMSE) linear detector for demodulating direct sequence (DS) code-division multiple access (CDMA) signals is studied, assuming that the users are assigned random signature sequences. We obtain tight upper and lower bounds on the expected near-far resistance of the MMSE detector, averaged over signature sequences and delays, as a function of the processing gain and the number of users. Since the MMSE detector is optimally near-far-resistant, these bounds apply to any multiuser detector that uses the same observation interval and sampling rate. The lower bound on near-far resistance implies that, even without power control, linear multiuser detection provides near-farresistant performance for a number of users that grows linearly with the processing gain.

KW - Cdma (code-division multiple access)

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KW - Interference suppression

KW - Multiuser detection

KW - Random signature sequence

KW - Spread spectrum

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