Joint estimation of carrier offset and code timing for DS-CDMA with performance analysis

Khaled Amleh, Hongbin Li

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper considers the problem of joint carrier offset and code timing estimation for code-division multiple-access (CDMA) systems. In contrast to existing schemes that require nonlinear iterative searches over the multidimensional parameter space, this paper proposes a blind estimator that provides an algebraic solution to the joint parameter estimation problem. By exploiting the subspace structure of the observed signal, the multiuser estimation is first decoupled into a series of single-user estimation problems, and then analytical tools of polynomial matrices are invoked for joint carrier and code timing estimation of a single user. The proposed estimator is near-far resistant. It can deal with frequency-selective and time-varying channels. The performance of the proposed scheme is examined analytically by a first-order perturbation analysis. The authors also derive an unconditional Cramér-Rao bound (CRB) that is conditioned neither on fading coefficients nor information symbols; as such, the CRB is considered a suitable lower bound for blind methods. Numerical examples are presented to evaluate and compare the proposed and a multidimensional search (MD-search)-based scheme.

Original languageEnglish (US)
Pages (from-to)1980-1987
Number of pages8
JournalIEEE Transactions on Wireless Communications
Volume4
Issue number5
DOIs
StatePublished - Sep 1 2005

Fingerprint

Code Division multiple Access
Code division multiple access
Performance Analysis
Timing
Time-varying Channels
Estimator
Polynomial Matrices
Perturbation Analysis
Fading
Parameter estimation
Parameter Space
Parameter Estimation
Subspace
Polynomials
Lower bound
First-order
Numerical Examples
Series
Evaluate
Coefficient

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Cite this

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title = "Joint estimation of carrier offset and code timing for DS-CDMA with performance analysis",
abstract = "This paper considers the problem of joint carrier offset and code timing estimation for code-division multiple-access (CDMA) systems. In contrast to existing schemes that require nonlinear iterative searches over the multidimensional parameter space, this paper proposes a blind estimator that provides an algebraic solution to the joint parameter estimation problem. By exploiting the subspace structure of the observed signal, the multiuser estimation is first decoupled into a series of single-user estimation problems, and then analytical tools of polynomial matrices are invoked for joint carrier and code timing estimation of a single user. The proposed estimator is near-far resistant. It can deal with frequency-selective and time-varying channels. The performance of the proposed scheme is examined analytically by a first-order perturbation analysis. The authors also derive an unconditional Cram{\'e}r-Rao bound (CRB) that is conditioned neither on fading coefficients nor information symbols; as such, the CRB is considered a suitable lower bound for blind methods. Numerical examples are presented to evaluate and compare the proposed and a multidimensional search (MD-search)-based scheme.",
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Joint estimation of carrier offset and code timing for DS-CDMA with performance analysis. / Amleh, Khaled; Li, Hongbin.

In: IEEE Transactions on Wireless Communications, Vol. 4, No. 5, 01.09.2005, p. 1980-1987.

Research output: Contribution to journalArticle

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