Simplified, Energy Efficient, Catalytic, Reactive Distillation of Conventional Ethylbenzene

Not Available The object of the proposed effort is to develop a new improved serial-tone HF modem capable of two-way data communications at variable rates up to 64 kb/s over a single frequency band. The proposing company has recently developed a serial-tone 64 kb/s modem using two frequencies for full duplex operation. The new single-frequency approach addresses improved bandwidth efficiency and adds both a secure and a non-secure orderwire mode. The new modem will result in an order of magnitude increase in HF link capacity permitting a more efficient integration of HF radio links into a broad range of backbone networks, such as TCP/IP, ATM, or X.25. The serial-tone waveform will allow much more efficient use of HF power amplifiers. The modem will also be designed to be resistant to narrowband interference and impulse noise. The Phase I effort will analyze and simulate performance of the most promising approaches to the difficult proposed objectives, including coding tradeoffs improving bandwidth efficiency, data interface types, and the new duplex operational mode, when interfaced with the adaptive equalizer, the link protocol, and the amplifier interface. Detailed computer simulations will be used to validate the design choices. A prototype will be designed, with a view towards a Phase II implementation and test.