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Radio Link Modem

Fri, 04/06/2001 - 6:38am
The modem serves to secure full duplex transmissions of voice, data and commands over narrow band channels for V/UHF and HF/SSB. In addition it serves for precise network-wide synchronization for simulcast radio networks. Data transmission takes place over RS-232 and synchronous interfaces. Independently of these, remote control commands can be transmitted in both directions.

Data and voice are ciphered using an extremely secure technique. Coding delay is minimal and voice intelligibility is excellent. The modem adjusts automatically to current channel conditions. What ensues is adaptive line equalization and automatic link offset compensation. Beyond this, the transmission is secured with FEC and interleaving. The result is a very robust transmission even under extremely poor channel conditions and environments. The modem spectrum can be shifted in accordance with the bandwidth characteristics of the radio link. Existing link infrastructures can thus, to a great extent, remain in place as they are.

An implementation for military applications is available, which allows secure data transmission over V/UHF and HF/SSB channels even when speeds exceed MACH-2.

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