ABSTRACT
This chapter discusses the basics of single-frequency network (SFN). In a SFN there are several conditions to be fulfilled. First of all, the main purpose of a SFN is to reuse the same frequency over a bigger coverage area. A multifrequency network is nothing more than a broadcast network using the historical principle of transporting different local content on different transmitter stations using different frequencies. The broadcast transmission time in the radio frequency domain, which is the beginning of an orthogonal frequency-division multiplexed symbol, frame or superframe, can be shifted slightly forward and backward in the transmitters to optimize the SFN. The SFN adapter in the broadcast headend and all transmitter stations in an SFN contain redundant Global Positioning System receivers. The main parameters of a digital terrestrial broadcast transmitter need to be tested shortly before the network is to go on air. Terrestrial Integrated Services Digital Broadcasting is the Japanese system for digital terrestrial television.
