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Hybrid Adaptive Channel Estimation in WCDMA Downlink Systems
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- Authors
- Issue Date
- 2003-06
- Citation
- Proc. IST Mobile and Wireless Communications Summit, 2003
- Keywords
- channel estimation ; WCDMA
- Abstract
- The receiver performance of DS-CDMA
systems is significantly affected by the accuracy of
channel estimate. In WCDMA downlink systems, the
channel information can be estimated using a common
pilot channel (CPICH). Since this pilot signal is
transmitted to all users in the cell with constant power,
we consider the improvement of channel estimate by
additionally using power-controlled data signal in the
dedicated physical channel (DPCH). Since decision
errors are unavoidable in the DPCH decoding process,
we combine the channel estimate from the CPICH and
DPCH, considering the DPCH data decision error. For
further improvement of channel estimate, we also
employ an adaptive channel estimation filter (CEF).
Numerical results show that the proposed channel
estimator outperforms the conventional pilot channel
aided estimator, particularly when the channel
condition becomes worse
- Language
- English
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