Decision-feedback equalization of pulse-position modulation on measured nondirected indoor infrared channels

We examine the performance of two decision-feedback equalizers (DFEs) for pulse-position modulation (PPM) on measured nondirected indoor infrared channels with intersymbol interference. PPM offers high average-power efficiency, but on ISI channels, unequalized PPM suffers severe performance penaltie...

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Bibliographic Details
Published in:IEEE transactions on communications 1999-04, Vol.47 (4), p.500-503
Main Authors: Audeh, M.D., Kahn, J.M., Barry, J.R.
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Decision feedback equalizers
Delay
Equalization
Equalizers
Indoor
Infrared
Intersymbol interference
Maximum likelihood detection
Modulation
Optical fiber communication
Optical noise
Optical receivers
Optical transmitters
Optimization
Pulse measurements
Pulse modulation
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Summary:We examine the performance of two decision-feedback equalizers (DFEs) for pulse-position modulation (PPM) on measured nondirected indoor infrared channels with intersymbol interference. PPM offers high average-power efficiency, but on ISI channels, unequalized PPM suffers severe performance penalties. We have previously examined the performance of the maximum-likelihood sequence detector (MLSD), and found that it yields significant improvements. However, the MLSD often requires such large complexity and delay that it may be impractical. We investigate suboptimal, reduced-complexity equalization techniques for PPM, providing a performance analysis of zero-forcing chip-rate and symbol-rate DFEs. Our results show that a symbol-rate DFE provides performance that closely approaches that of the optimal MLSD.
ISSN:0090-6778
1558-0857
DOI:10.1109/26.764921