TY - JOUR
T1 - Blind and training-assisted subspace code-timing estimation for CDMA with bandlimited chip waveforms
AU - Amleh, Khaled
AU - Li, Hongbin
AU - Li, Tao
N1 - Funding Information:
Manuscript received July 13, 2003; revised March 16, 2004, May 15, 2004, and June 30, 2004. This work was supported in part by the New Jersey Commission on Science and Technology and by the Army Research Office by Grant DAAD19-03-1-0184. K. Amleh is with the Department of Engineering, Pennsylvania State University, Mont Alto, PA 17237 USA (e-mail: [email protected]). H. Li is with the Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030 USA (e-mail: [email protected]). T. Li is with the Computer Department, Sichuan University, Chengdu 610065, P.R. China (e-mail:[email protected]). Digital Object Identifier 10.1109/TVT.2004.836963
PY - 2004/11
Y1 - 2004/11
N2 - In this paper, we present a group of subspace code-timing estimation algorithms for asynchronous code-division multiple-access (CDMA) systems with bandlimited chip waveforms. The proposed schemes are frequency-domain based techniques that exploit a unique structure of the received signal in the frequency domain. They can be implemented either blindly or in a training-assisted manner. The proposed blind code-timing estimators require only the spreading code of the desired user, whereas the training-assisted schemes assume the additional knowledge of the transmitted symbols of the desired user. Through a design parameter of user choice, the proposed schemes offer flexible tradeoffs between performance, user capacity, and complexity. They can deal with both time- and frequency-selective fading channels. Numerical simulations show that the proposed schemes are near-far resistant, and compare favorably to an earlier subspace code-timing estimation scheme that is implemented in the time domain.
AB - In this paper, we present a group of subspace code-timing estimation algorithms for asynchronous code-division multiple-access (CDMA) systems with bandlimited chip waveforms. The proposed schemes are frequency-domain based techniques that exploit a unique structure of the received signal in the frequency domain. They can be implemented either blindly or in a training-assisted manner. The proposed blind code-timing estimators require only the spreading code of the desired user, whereas the training-assisted schemes assume the additional knowledge of the transmitted symbols of the desired user. Through a design parameter of user choice, the proposed schemes offer flexible tradeoffs between performance, user capacity, and complexity. They can deal with both time- and frequency-selective fading channels. Numerical simulations show that the proposed schemes are near-far resistant, and compare favorably to an earlier subspace code-timing estimation scheme that is implemented in the time domain.
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U2 - 10.1109/TVT.2004.836963
DO - 10.1109/TVT.2004.836963
M3 - Article
AN - SCOPUS:10244279153
SN - 0018-9545
VL - 53
SP - 1735
EP - 1745
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 6
ER -