The patent-pending cognitive frequency management protocol used by the XG1™ radios utilzing up to 45 radio channels simultaneously, each of which can instantly change to avoid interference without human intervention.
Cognitive Radio
Cognitive radio is a paradigm for wireless communication in which either network or wireless node itself changes particular transmission or reception parameters to fulfill specific tasks. This parameter alteration is based on observations of various factors from external and internal cognitive radio environment, like radio frequency spectrum, user behavior, network state etc. http://en.wikipedia.org/wiki/Cognitive_radio
Cognitive Software-Defined Radio - CSDR
A cognitive radio that is also software defined.
Cognitive Software Radio - CSR
A smart non-SDR.
Cognitive Hardware-Defined Radio - CHDR
A cognitive radio that has fixed modulation and demodulation characteristics.
Digipeating
A technique used to extend the range in a network of radios. Messages that cannot be directly transmitted to a distant radio are relayes through one or more intermediate radios.
The name is taken from frequency hopping spread spectrum (FHSS). It is a modulation technique of radio transmission where the carrier is continually “hopped” from one channel to another. http://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum
Modulation Techniques
Modulation is the process of varying a carrier signal, typically a sinusoidal signal, in order to use that signal to convey information. http://en.wikipedia.org/wiki/Modulation
OFDM - Orthogonal Frequency-Division Multiplexing
Orthogonal frequency-division multiplexing (OFDM), also sometimes called discrete multitone modulation (DMT), is a transmission technique based upon the idea of frequency-division multiplexing (FDM). This techniques increases bandwidth by modulating on multiple channels at the same time. http://en.wikipedia.org/wiki/OFDM
Radio Skip
In radio propagation, skip is when a radio signal is reflected or refracted by the atmosphere or ionosphere, and returns to Earth in an unexpectedly far-away place. http://en.wikipedia.org/wiki/Skip_%28radio%29
The radio spectrum, as regulated by the FCC, is divided into channels which are licensed by individuals, corporations and municipalities as primary users. Most of these channels are used for voice communications which actively transmit only a small fraction of the time. This is an inefficient use of the available spectrum. The FCC has licensed secondary users for many channels on the basis of non-interference with the primary users in an effort to "reuse" the radio spectrum over time. Although this increases efficiency, it is not optimal due to the availability of time when the primary user is idle, complaints about interference from secondary users, plus the necessity of managing licensees and their disputes. Adapt4 has developed its SRT technology to facilitate an efficient and unobtrusive way of using otherwise idle radio spectra. By combining OFDM, frequency hopping and cognitive radio technologies, the radio spectrum is put to optimal use while operating within existing FCC rules. http://www.adapt4.com
Spectrum Usage Policy
The FCC develops and administers a set of rules governing the use of the electromagnetic spectrum. Collectively these rules define a spectrum usage policy. http://www.fcc.gov
A private communications network usually used within a company, or by several different companies or organizations, to communicate over a public network. VPN message traffic is carried on public networking infrastructure (e.g. the Internet) using standard (often insecure) protocols, or over a service providers network providing VPN service guarded by well defined Service Layer Agreement (SLA) between the VPN customer and the VPN Service Provider. http://en.wikipedia.org/wiki/VPN
