Question

Many terrestrial digital TV broadcasting systems are based on the DVB-T standard, implemented using a Single Frequency Network, in which the same channel can broadcast on the same frequency in different locations, even when there is overlapping coverage. OFDM modulation is used, commonly with several thousand subcarriers within each 6-8 MHz bandwidth channel. Error correcting codes are applied to the digital bitstreams representing the TV video, audio and data streams, and they typically contribute a 10-20% increase in bit rate.

Given that error correcting codes involve greater overhead than error detecting codes, why have correcting codes been chosen for this application?

Answer 1