Modified Viterbi decoders for joint data detection and timing recovery of convolutionally encoded PPM and OPPM optical signals

Author

Lai, Che-Hsi ; Kiasaleh, Kamran

Author_Institution

Nokia Telecommun. Inc., Westlake, TX, USA

Volume

45

Issue

1

fYear

1997

fDate

1/1/1997 12:00:00 AM

Firstpage

90

Lastpage

94

Abstract

Two novel Viterbi decoders, known as joint Viterbi decoder (JVD) and enhanced Viterbi decoder (EVD), for synchronization and data detection are introduced and analyzed for convolutionally-encoded (CE) optical pulse-position modulation (PPM) and overlapping PPM (OPPM) channels. For the JVD algorithm, a count metric is employed to perform the Viterbi decoding in the absence of synchronization. For the EVD algorithm, a memory array is utilized to reduce the computation time of the JVD algorithm. With the aid of a previously proposed upper-bound and taking advantage of the minimal asymptotic normalized timing error (MANTE) concept, approximate performance measures for the EVD and JVD receivers are obtained

Keywords

Viterbi decoding; computational complexity; convolutional codes; optical communication; optical modulation; optical signal detection; pulse position modulation; telecommunication channels; timing; EVD algorithm; EVD receivers; JVD algorithm; JVD receivers; Viterbi decoding; approximate performance measures; computation time reduction; convolutionally encoded OPPM optical signals; convolutionally encoded PPM optical signals; count metric; enhanced Viterbi decoder; joint Viterbi decoder; joint data detection; memory array; minimal asymptotic normalized timing error; modified Viterbi decoders; optical communication; optical pulse position modulation; overlapping PPM channels; synchronization; timing recovery; upper bound; Convolution; Decoding; Optical modulation; Optical pulses; Optical receivers; Phase locked loops; Pulse modulation; Space vector pulse width modulation; Timing; Viterbi algorithm;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.554290

Filename

554290