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Improved channel estimation and SIR measurement in WCDMA downlink systems

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Authors
Choi, Ji-Woong; Lee, Yong-Hwan
Issue Date
2005-03
Publisher
Institute of Electrical and Electronics Engineers
Citation
IEEE Transactions on Vehicular Technology, vol. 54, no. 2, pp. 525-537, March 2005
Keywords
signal-to-interference power ratio (SIR) measurementwide-band code-division multiple access (WCDMA).
Abstract
The rake receiver performance of a direct-sequence code-division multiple-access (DS-CDMA) system can significantly be degraded unless the channel condition is properly estimated. Since the channel condition is time-varying and location-dependent, it is desirable to employ an adaptive channel estimator (ACE) that can properly adjust the bandwidth of the channel estimation filter (CEF) according to the channel condition such as the maximum Doppler frequency. To this end, we propose low-complexity ACE and signal-to-interference power ratio (SIR) estimator for wide-band CDMA downlink systems with and without the use of transmit antenna diversity. The proposed schemes adjust the bandwidth of theCEF by exploiting the correlation characteristics of the received pilot signal. The analytic design is verified by computer simulation. Simulation results show that the proposed ACE and SIR estimator can significantly improve the link performance for a wide range of channel condition, particularly when the channel condition is poor.
ISSN
0018-9545
Language
English
URI
http://hdl.handle.net/10371/6736
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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