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Digital Audio Broadcasting
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====Modulation==== Immunity to fading and inter-symbol interference (caused by multipath propagation) is achieved without equalization by means of the [[OFDM]] and [[DQPSK]] modulation techniques. For details, see the [[OFDM system comparison table]]. Using values for Transmission Mode I (TM I), the [[OFDM]] modulation consists of 1,536 subcarriers that are transmitted in parallel. The useful part of the OFDM symbol period is 1.0 ms, which results in the OFDM subcarriers each having a bandwidth of 1 kHz due to the inverse relationship between these two parameters, and the overall OFDM channel bandwidth is 1.537 MHz. The OFDM guard interval for TM I is 0.246 ms, which means that the overall OFDM symbol duration is 1.246 ms. The guard interval duration also determines the maximum separation between transmitters that are part of the same single-frequency network (SFN), which is approximately 74 km for TM I.
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