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Permutation-network-based optoelectronic path-history units for Viterbi decoders.

¹Department of Electronic Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei, Taiwan. mblin@et.ntust.edu.tw

|March 20, 2008

Summary

A novel optoelectronic path-history (PH) unit for Viterbi decoders is proposed, utilizing photonic signal propagation for faster trace-back operations. This design offers enhanced speed over traditional electronic implementations.

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Area of Science:

Electrical Engineering
Computer Science
Optoelectronics

Background:

Viterbi decoders are crucial for error correction in digital communication systems.
The path-history (PH) unit is a critical component of Viterbi decoders, responsible for the trace-back operation.
Current electronic implementations of PH units face speed limitations.

Purpose of the Study:

To introduce a new concept for designing Viterbi decoder PH units using permutation networks.
To propose an optoelectronic PH unit that leverages photonic signal propagation.
To demonstrate the potential for increased speed compared to electronic counterparts.

Main Methods:

The study conceptualizes the trace-back operation as a signal propagation through a trellis diagram.
An optoelectronic PH unit is designed using directional coupler switches and registers.
Both unfolded and folded architectures of the proposed optoelectronic PH unit are presented.

Main Results:

The proposed optoelectronic PH unit directly implements the trellis diagram.
Trace-back operations are performed using photonic signal propagation, controlled by decision bits.
The optoelectronic approach offers inherently faster performance than electronic Viterbi decoder PH units.

Conclusions:

The novel optoelectronic PH unit design provides a faster alternative for Viterbi decoders.
This approach offers a new paradigm for implementing complex digital signal processing functions.
Further research can explore the full potential of optoelectronic implementations in communication systems.