Least Squares Based Timing Acquisition and Tracking for Closely Spaced Multipath in DS-CDMA
Summary :
In this paper, we present a time-delay estimation algorithm in a closely spaced multipath environment for a direct-sequence code division multiple access (DS-CDMA) systems. The proposed scheme first converts the observed signal to the frequency domain by Fast Fourier Transform (FFT). We then formulate a nonlinear estimation problem, and convert it into a large scale linear least squares problem. We apply conjugate gradients iterations on the resulting normal equations to obtain the solution. Unlike the methods which invoke the criterion of nonlinear least squares, the proposed scheme can achieve higher resolution. The delay estimation is combined with a tracking algorithm based on a FIR prefilter. Simulation results confirm the effectiveness of the proposed algorithm in both AWGN and Rayleigh fading channels.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E89-B No.3 pp.959-962
- Publication Date
- 2006/03/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1093/ietcom/e89-b.3.959
- Type of Manuscript
- LETTER
- Category
- Transmission Systems and Transmission Equipment for Communications
Authors
Keyword
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Inwoo SONG, Jungwoo LEE, "Least Squares Based Timing Acquisition and Tracking for Closely Spaced Multipath in DS-CDMA" in IEICE TRANSACTIONS on Communications,
vol. E89-B, no. 3, pp. 959-962, March 2006, doi: 10.1093/ietcom/e89-b.3.959.
Abstract: In this paper, we present a time-delay estimation algorithm in a closely spaced multipath environment for a direct-sequence code division multiple access (DS-CDMA) systems. The proposed scheme first converts the observed signal to the frequency domain by Fast Fourier Transform (FFT). We then formulate a nonlinear estimation problem, and convert it into a large scale linear least squares problem. We apply conjugate gradients iterations on the resulting normal equations to obtain the solution. Unlike the methods which invoke the criterion of nonlinear least squares, the proposed scheme can achieve higher resolution. The delay estimation is combined with a tracking algorithm based on a FIR prefilter. Simulation results confirm the effectiveness of the proposed algorithm in both AWGN and Rayleigh fading channels.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e89-b.3.959/_p
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@ARTICLE{e89-b_3_959,
author={Inwoo SONG, Jungwoo LEE, },
journal={IEICE TRANSACTIONS on Communications},
title={Least Squares Based Timing Acquisition and Tracking for Closely Spaced Multipath in DS-CDMA},
year={2006},
volume={E89-B},
number={3},
pages={959-962},
abstract={In this paper, we present a time-delay estimation algorithm in a closely spaced multipath environment for a direct-sequence code division multiple access (DS-CDMA) systems. The proposed scheme first converts the observed signal to the frequency domain by Fast Fourier Transform (FFT). We then formulate a nonlinear estimation problem, and convert it into a large scale linear least squares problem. We apply conjugate gradients iterations on the resulting normal equations to obtain the solution. Unlike the methods which invoke the criterion of nonlinear least squares, the proposed scheme can achieve higher resolution. The delay estimation is combined with a tracking algorithm based on a FIR prefilter. Simulation results confirm the effectiveness of the proposed algorithm in both AWGN and Rayleigh fading channels.},
keywords={},
doi={10.1093/ietcom/e89-b.3.959},
ISSN={1745-1345},
month={March},}
Copy
TY - JOUR
TI - Least Squares Based Timing Acquisition and Tracking for Closely Spaced Multipath in DS-CDMA
T2 - IEICE TRANSACTIONS on Communications
SP - 959
EP - 962
AU - Inwoo SONG
AU - Jungwoo LEE
PY - 2006
DO - 10.1093/ietcom/e89-b.3.959
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E89-B
IS - 3
JA - IEICE TRANSACTIONS on Communications
Y1 - March 2006
AB - In this paper, we present a time-delay estimation algorithm in a closely spaced multipath environment for a direct-sequence code division multiple access (DS-CDMA) systems. The proposed scheme first converts the observed signal to the frequency domain by Fast Fourier Transform (FFT). We then formulate a nonlinear estimation problem, and convert it into a large scale linear least squares problem. We apply conjugate gradients iterations on the resulting normal equations to obtain the solution. Unlike the methods which invoke the criterion of nonlinear least squares, the proposed scheme can achieve higher resolution. The delay estimation is combined with a tracking algorithm based on a FIR prefilter. Simulation results confirm the effectiveness of the proposed algorithm in both AWGN and Rayleigh fading channels.
ER -
English
