Single frequency networks (SFNs) are a form of broadcasting network, usually digital, in which all the national radio stations are broadcast on a single frequency.
This differs from conventional FM networks, in which stations are broadcast over many frequencies to avoid technical problems.
Single frequency networks usually use COFDM modulation.
The British digital radio network uses SFN technology.
A single-frequency network or SFN is a broadcast network where several transmitters simultaneously send the same signal over the same frequency channel.
SFN schemes are somewhat analogous to what in non-broadcast wireless communication, for example cellular networks and wireless computer networks, is called transmitter macrodiversity, CDMA soft handoff and Dynamic SingleFrequencyNetworks (DSFN).
In a SingleFrequencyNetwork, the transmitters and receivers are usually synchronized with the others, using GPS or a signal from the main station or network as a reference clock.
Dynamic SingleFrequencyNetworks (DSFN) is a transmitter macrodiversity technique for for example OFDM based cellular networks.
DSFN is based on the idea of singlefrequencynetworks (SFN), which is a group of radio transmitters that send the same signal simultaneously over the same frequency.
The term originates from the broadcasting world, where a broadcast network is a group of transmitters that send the same TV or radio program.
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