MIL-STD-188-110C


Overview:

The RapidM modems include the narrowband and wideband HF data modem waveforms which are in compliance with MIL-STD-188-110C. This version of the standard includes the wideband HF data modems spanning bandwidth from 3 to 24 kHz in 3 kHz steps, as described in Appendix D.

Status:

The third revision of the MIL-STD-188-110 “Military Standard Interoperability and Performance Standards for Data Modems” was released in April 2000. The updated MIL-STD-188-110C Appendix D WBHF waveform standard was ratified in 2011. It has since been superseded by later revisions, the current one being MIL-STD-188-110D (December 2017).

Key Features:

  • Autobaud capable Single Sideband (SSB) Narrowband STM waveforms including the Legacy MS110A and the high data rates waveform modes of MS110B Appendix C, providing data rates above from 75 bps to 9600 bps in 3 kHz.
  • Autobaud capable Single Sideband (SSB) Wideband STM waveforms described in Appendix D of the MIL-STD 188-110C standard specifies wideband HF Data Modem Waveforms for bandwidths from 3 kHz to 24 kHz in 3 kHz steps. In 24 kHz the date rates range from 600 bps to 120 000 bps.

Relevance:

  • The 3 kHz bandwidth waveforms as specified in MIL-STD 188-110C Appendix D provides a better performance compared to the 75 bps to 2400 bps waveforms of the MS110A/MS110B specifications.
  • The motivation for extending the HF bandwidths is to provide user bit rates up to 120 kbps and allow users the option of selecting the bandwidth and modulation so as to optimize modem and ARQ (e.g. STANAG 5066 WB) performance.
  • HF communication has generally been limited to narrower bandwidths and lower data rates compared to satellite communication. The availability of high data rate Beyond Line of Sight (BLOS) communications without the use of satellites or radio-relay is important to provide satellite-like data services over HF.
  • The higher data rates supported by the Appendix D waveforms are sufficient to support services not previously practical over HF radio such as real-time video transmission.

Serial Tone Mode (STM) – Single Sideband:

The table below summarises the complete MIL-STD 188-110C Appendix D STM waveform suite. Included in the table are the data rate as a function of bandwidth, waveform number and modulation.

Data Rate [bps]
Bandwidth Waveform Number & Modulation
13 12 11 10 9 8 7 6 5 4 3 2 1 0
Q-PSK 256-QAM 64-QAM 64-QAM 32-QAM 16-QAM 8-PSK Q-PSK B-PSK B-PSK B-PSK B-PSK B-PSK WALSH
24 kHz 120000 96000 76800 64000 51200 38400 25600 12800 9600 4800 2400 1200 600
21 kHz 115200 76800 57600 48000 38400 28800 19200 9600 4800 2400 1200 600 300
18 kHz 90000 72000 57600 48000 38400 28800 19200 9600 4800 2400 1200 600
15 kHz 76800 57600 48000 40000 32000 24000 16000 8000 4800 2400 1200 600 300
12 kHz 64000 48000 38400 32000 25600 19200 12800 6400 4800 2400 1200 600 300
9 kHz 48000 36000 28800 24000 19200 14400 9600 4800 2400 1200 600 300
6 kHz 32000 24000 19200 16000 12800 9600 6400 3200 2400 1200 600 300 150
3 kHz 2400 16000 12000 9600 8000 6400 4800 3200 1600 1200 600 300 150 75
Ground Wave Sky Wave

Table 1: MIL-STD-188-110C Appendix D – STM Waveform Suite

MIL-STD-188-110C Modems

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