Contents

This document states the measured performance standards of the RM6.

• STANAG 4539(QAM)
• STANAG 4285(PSK)
• STANAG 4415(PSK NATO robust)
• MIL-STD-188-110B(QAM)
• STANAG 4529 (NB PSK)
• MIL-STD-188-110A (PSK)
• MIL-STD-188-110B Appendix F (QAM, ISB)

STANAG 4539

STANAG 4539 standard provides a family of coded data rates from 75 to 9600 bps and an uncoded data rate of 12k8 bps. In addition, these waveforms incorporate AUTOBAUD. STANAG 4539 is an attractive choice for Automatic-Repeat-Request (ARQ) systems.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

Table 1 presents the complete STANAG 4539 suite of waveforms. Included in the table are the modulation, code rate and interleaver settings for each data rate. The lower rates include Tone Excision (TEX) (see TEX column table below). Cancellation of up to 4 tones is possible.

The tables below present the different interleaver sizes.

The following tables give performance results for the RM6 unit for various data rates. The results were established using an HF Channel Simulator.

An AWGN channel is representative of ground wave propagation while the POOR channel represents skywave conditions. A RICEAN channel has a steady (specular) component and a fading component, thus representing a mixture of the ground and skywave propagation scenarios

MIL-STD-188-110B

The MIL-STD-188-110B serial tone waveform comprises of the same family of data rates, coding and interleavers as STANAG 4539. Each setting is fully interoperable with its STANAG 4539 equivalent. In addition, an uncoded data rate of 4800 bps is supported.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

The lower rates include Tone Excision (TEX) (see TEX column table below). Cancellation of up to 4 tones is possible.

The MIL-STD-188-110B is functionally the same as STANAG 4539. The Performance specification differs insofar as:

• The performance requirements for a Ricean channel are omitted.
• Design objectives are omitted
• The STANAG 4203 filters are omitted from the HFCS for this test.

The following table gives performance results for the RM6 unit (established using HF Channel Simulator).

STANAG 4285

The STANAG 4285 waveform does not have embedded AUTOBAUD fields. Thus the transmitter and receiver need to be set up to the desired data rate and interleaver at both ends of the link. The setting used in one direction of the link by no means need to be the same as in the reverse direction.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

The STANAG 4285 waveform includes TEX capability. Cancellation of up to 4 tones is possible. Table 7 and Table 8 below summarise the waveform OTA settings.

The following table gives performance results for the RM6 unit (established using HF Channel Simulator).

The STANAG 4285 standard does not specify any performance requirements. The requirements and measurement conditions given below are based on MS 110A. Please note that the SNR is measured in 3 kHz to alleviate comparisons.

STANAG 4529

This waveform is suitable for shore-to-ship use in 1240 Hz channels.

The narrower occupied bandwidth is achieved by using a symbol rate of 1200 symbols per second. The transmitter and receiver need to be set up to the desired data rate and interleaver at both ends of the link.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

The STANAG 4529 waveform includes TEX capability. Cancellation of up to 4 tones is possible. Table 10 and Table 11 below summarise the waveform OTA settings.

The following table gives performance results for the RM6 unit (established using HF Channel Simulator).

The STANAG 4529 standard does not specify any performance requirements. The requirements and measurement conditions given below are based on MS 110A. Please note that the SNR is measured in 3 kHz to alleviate comparisons.

STANAG 4415

The STANAG 4415 is also known as the very robust 75 bps HF data waveform. It will operate effectively almost 11 dB below the noise floor in a noise dominated environment.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous. The STANAG 4415 waveform includes TEX capability. This waveform is also included as the 75 bps rate of STANAG 4539, MIL-STD-188-110B and MIL-STD-188-110A.

The waveform supports the interleaver sizes given in Table 2.

The following tables give performance results for the RM6 unit (HF Channel Simulator).

MIL-STD-188-110A

This waveform provides a family of rates from 75 bps to 2400 bps with convolution coding and 4800 bps in an uncoded form. For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

The MIL-STD-188-110A waveform suite includes TEX capability whereby suppression of up to 4 interfering tones is possible.

Table 15 summarises the waveform OTA settings.

The waveform supports the interleaver sizes given in Table 2.

The following table gives performance results for the RM6 unit (HF Channel Simulator).

MIL-STD-188-110B Appendix F (ISB operation)

The rates specified in MIL-STD-188-110B Appendix F are for ISB operation and require an ISB capable radio. These rates of this waveform family include 9600, 12800, 16000 and 19200 bps (all coded). This waveform is suitable for very high data rate traffic under ground-wave or benign HF propagation conditions.

For this waveform the RM6 modem supports the DTE modes Standard Async, High-speed and synchronous.

Table 17 represents the data rates for MIL-STD-188-110B Appendix F.

The following table gives performance results for the RM6 unit (established using HF Channel Simulator).

The MS 110B App. F standard does not specify any performance requirements. The requirements and measurement conditions given below are bases on STANAG 4539.