01 Nov Spectrum Efficiency – Your Question Answered
Our best specialists will respond in brief to your questions. We will
post them regularly. Please submit them in writing and in audio
with your picture and we will post the answers here. Please keep your
questions short and relevant and send them to: projectoffice@drm.
Which digital radio system has the highest available bit rate for the amount of spectrum “real estate”?
In the VHF band there is more “real estate” available, DRM is the most efficient with 1.8 kilobits/kHz. This is followed by DAB(+) 0.75 and all digital HDFM 0.48. In the high and medium frequency bands in the Americas, DRM is 3.6 and all digital HDAM 2.0 for a 20 kHz channel width, which uses part of each adjacent channels aggravating interference. To keep the digital within the channel a 10 kHz wide signal is used where DRM is 3.48 and all digital HDAM 2.0. In the rest of the world in the medium (and Europe’s low frequency bands) the equivalents are 3.6 for 18 kHz channel and 3.4 for 9 kHz channel.