Diversity combining with imperfect channel estimation
You, R.
Hong Li
Bar-Ness, Y.
Electr. & Comput. Eng. Dept., New Jersey Inst. of Technol., Newark, NJ, USA;
This paper appears in: Communications, IEEE Transactions on
Publication Date: Oct. 2005
Volume: 53,
Issue: 10
On page(s): 1655- 1662
ISSN: 0090-6778
INSPEC Accession Number: 8675869
Digital Object Identifier: 10.1109/TCOMM.2005.857156
Current Version Published: 2005-10-10
Abstract
The optimal diversity-combining technique is investigated for a multipath Rayleigh fading channel with imperfect channel state information at the receiver. Applying minimum mean-square error channel estimation, the channel state can be decomposed into the channel estimator spanned by channel observation, and the estimation error orthogonal to channel observation. The optimal combining weight is obtained from the first principle of maximum a posteriori detection, taking into consideration the imperfect channel estimation. The bit-error performance using the optimal diversity combining is derived and compared with that of the suboptimal application of maximal ratio combining. Numerical results are presented for specific channel models and estimation methods to illustrate the combined effect of channel estimation and detection on bit-error rate performance.
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