NATO is the North Atlantic Treaty Organization. Packet is a collection of information symbols transmitted together on a communications channel. It was precompetitive research on advanced communications systems. It was superseded by the ACTS program. Radio spectrum is a range of radio frequencies required to support one or more communications channels.
RAM is random-access memory.
It provides a variety of cross-networking, repeater, and information services. RF is radio frequency. The program is sponsored by the Defense Advanced Research Projects Agency and the National Science Foundation. The higher the SNR, the clearer the transmission. Software-defined radio is a radio implemented on DSPs with functions defined by software, which can be downloaded as needed.