Digital Audio Broadcasting experimental results of the coverage obtained using the COFDM system

The aim of Digital Audio Broadcasting (DAB) is to deliver near-CD quality stereo audio programmes in digital form to domestic receivers. One of the limitations of conventional FM radio is that the signal received, in particular by portable and mobile receivers, is often degraded by multipath propagation. A DAB system should therefore be resistant to degradation in the presence of multipath. It should also be spectrally efficient. The DAB transmission system is described. Results are presented of the coverage achieved from a DAB transmitter. The difference in performance resulting from changing various system parameters such as transmit frequency, and RF bandwidth is also compared