IrDA-VFIr (16 Mb/s): modulation code and system design

Devices for convenient information exchange over the wireless infrared channel are commonly found in many of today's mobile platforms for computing, communicating, and imaging. Most devices comply with the international standards promoted by the Infrared Data Association for data rates of up to...

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Bibliographic Details
Published in:IEEE personal communications 2001-02, Vol.8 (1), p.58-71
Main Authors: Hirt, W., Hassner, M., Heise, N.
Format: Article
Language:English
Subjects:
Decoding
Demodulation
Encoding
Modulation coding
Nonlinear optics
Optical distortion
Optical pulses
Optical receivers
Pulse modulation
Studies
Systems design
Transceivers
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Summary:Devices for convenient information exchange over the wireless infrared channel are commonly found in many of today's mobile platforms for computing, communicating, and imaging. Most devices comply with the international standards promoted by the Infrared Data Association for data rates of up to 4 Mb/s. With the approval of a 16 Mb/s data rate option called Very Fast Infrared, IrDA's point-to-point usage model is extendable to applications requiring wireless connectivity beyond 4 Mb/s. We describe the design and the properties of a new modulation code specifically developed for VFIr, and discuss related system design aspects. After defining basic system requirements and modulation constraints imposed by the WIrC, we introduce a rate-2/3 run-length-limited code designed to meet these criteria. The Boolean expressions for encoding and decoding are given, and their implementation is discussed together with various aspects of system design such as scrambling, invalid sequence detection, and error propagation. Furthermore, it is shown that the specific composite nature of the new RLL modulation code enables simple and efficient generation of VFIr packet frames by encoding an equivalent packet frame assembled entirely in the code's input data domain.
ISSN:1070-9916
1536-1284
1558-0687
DOI:10.1109/98.904900