Decision-Feedback Equalization for Pulse-Position Modulation

In this paper, we propose a minimum mean squared error (MMSE) decision feedback equalizer (DFE) for pulse position modulated (PPM) signals in the presence of intersymbol interference (ISI). While traditional uses of PPM may not have had ISI, PPM is increasingly being considered for use in situations...

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Vydáno v:	IEEE transactions on signal processing Ročník 55; číslo 11; s. 5361 - 5369
Hlavní autoři:	Klein, A.G., Duhamel, P.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York, NY IEEE 01.11.2007 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Algorithms Amplitude modulation Applied sciences Channels Computational efficiency Computer simulation Decision feedback equalization (DFE) Decision feedback equalizers Detection, estimation, filtering, equalization, prediction Equalization Equalizers Exact sciences and technology Finite impulse response filter Information, signal and communications theory Intersymbol interference Maximum likelihood estimation Modulation Modulation, demodulation optical communication Optical feedback Optical fiber communication Optical pulses Pulse modulation pulse position modulation (PPM) Signal and communications theory Signal, noise Telecommunications and information theory Ultra wideband technology Ultrawideband pulse position modulation (PPM) optical communication Decision feedback equalization (DFE) ultrawideband Performance evaluation High performance Optical telecommunication Modulated signal Decision feedback equalizers Pulse position modulation Stochastic method Ultra wide band Mean square error Learning Simulation Intersymbol interference Telecommunication system Descent method Gradient method
ISSN:	1053-587X, 1941-0476
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Popis
Shrnutí:	In this paper, we propose a minimum mean squared error (MMSE) decision feedback equalizer (DFE) for pulse position modulated (PPM) signals in the presence of intersymbol interference (ISI). While traditional uses of PPM may not have had ISI, PPM is increasingly being considered for use in situations where ISI is an issue, such as high-performance optical communication systems and ultrawideband communications. First, we review previous work on the subject which used the zero-forcing criterion under strict assumptions about the channel and equalizer lengths. Then, we derive a computationally efficient MMSE equalizer which removes these restrictions, and is suitable for use with training-based stochastic gradient-descent algorithms. Finally, we demonstrate the performance of the proposed equalizer with simulations.
Bibliografie:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 content type line 23
ISSN:	1053-587X 1941-0476
DOI:	10.1109/TSP.2007.899392