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Author Rezk, M. ♦ Friedlander, B.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2002
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science ♦ Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics
Subject Keyword Channel estimation ♦ MIMO ♦ Detectors ♦ Signal to noise ratio ♦ Receivers ♦ Space time codes ♦ Estimation ♦ ordered-branch-estimate-bound algorithm ♦ Multiple-input multiple-output ♦ channel estimation error ♦ correlated block fading ♦ mismatched maximum likelihood detector ♦ generalized likelihood ratio detector
Abstract This paper compares the performance of a MIMO system applying a Mismatched Maximum Likelihood Detector (MMLD) with that applying a Generalized Likelihood Ratio Detector (GLRD) in the presence of channel estimation errors. Two sources of error are considered: errors due to noise and errors due to time variations induced by Doppler effects. The MMLD relies on the available channel estimate whereas the GLRD combines the channel estimate with a block of received data and uses a joint channel-symbol estimation approach to solve for the transmitted symbols. The GLRD is shown to outperform the MMLD whenever errors in channel estimation are incurred and the performance gap depends on the amount of error. Furthermore, the GLRD provides a unified receiver structure which can also be applied to differentially encoded MIMO systems and to situation where no channel estimate is available as in blind MIMO. The improved performance of the GLRD comes with increased computational complexity. This problem is addressed through search efficient algorithms based on the branch-estimate-bound optimization framework. We analyze the performance of the GLRD and provide a tight upper bound on the BER of the system at high SNR. Simulation results are shown for a 2 × 2 MIMO system.
Description Author affiliation :: Dept. of Electr. Eng., Univ. of California Santa Cruz, Santa Cruz, CA, USA
ISSN 15361276
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-02-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 10
Issue Number 2
Size (in Bytes) 429.70 kB
Page Count 12
Starting Page 602
Ending Page 613


Source: IEEE Xplore Digital Library