HDL A High Performance, High Capacity Data Link Protocol Based On and Designed For STANAG 4538

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HDLA High Performance, High Capacity Data Link
Protocol - Based On and Designed For STANAG 4538

• Mark W. Chamberlain, Senior Principal Engineer
• William N. Furman, Harris Fellow, Senior
  Scientist
• Harris Corporation
• RF Communications Division

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Preliminary Results

• These are PRELIMINARY simulation results of a new
  HDL style data link protocol which utilizes the
  High Data Rate Waveforms defined in STANAG 4539
  and U.S. MIL-STD-188-110B
• A more comprehensive presentation will be given
  by Mark Chamberlain of Harris at MILCOM 2002
  Session U104 HF Radio Systems and Techniques

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Presentation Overview

• XDL Overview
• HDL Overview
• HDL Preliminary Performance
• Way Ahead

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XDL Overview

• XDL is a data link protocol offering error free
  data delivery
• Two modulation techniques
• Low-latency Data Link (LDL) - optimized for low
  SNR, poor channel conditions, smaller message
  sizes
• High-rate Data Link (HDL) - optimized for better
  channel conditions, larger message sizes
• Both techniques utilize extremely robust burst HF
  data waveforms
• Originally developed by Harris and defined in
  U.S. MIL-STD-141B Appendix C and adopted by
  STANAG 4538

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XDL Overview

• Harris was an original developer of U.S.
  Fed-Std-1052. This protocol utilizes adaptive
  data rate techniques to improve message
  throughput.
• XDL improves on this technology by
• Utilizing synchronous robust burst waveforms for
  ARQ signaling, no long preambles
• Forward / reverse transmission times fixed at
  link setup for duration of transfer
• Code-combining techniques use all received energy
  for optimal data delivery with NO data rate
  adaptation, effective code rate quickly self
  adapts to channel conditions

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LDL Performance500 Byte Payload
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HDL Performance5000 Byte Payload
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HDL Overview

• Higher Capacity Waveform Utilized
• These simulations employ the 64 QAM constellation
  (12,800 uncoded bit rate) defined in STANAG 4539
  with a Rate ¼ convolutional code
• More Efficient TM and Acknowledge Burst
• The team at Harris has been defining a new Burst
  Waveform, based on the previously presented
  scaleable Burst modem, which will deliver a 50
  bit payload in approximately 400ms
• Easily implemented by vendors already producing
  STANAG 4538 and STANAG 4539 or MIL-STD-188-110B
  products

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HDL Performance (5000 Byte Payload)
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HDL Performance (50,000 Byte Payload)
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Way Ahead

• This Presentation will be offered to the NATO
  AHWG in Livorno, Italy, June 25-27, 2002 as a
  possible enhancement to 4538.
• Harris plans further development work
  investigating
• Improved code combining techniques
• Improved Burst waveform techniques
• Additional methods to minimize protocol overhead
• An updated presentation will be made at MILCOM
  2002