DRM for VHF / FM (DRM+)

The Extension of DRM to VHF Frequencies:

The DRM standard for broadcast frequencies above 30MHz (called 'DRM+') uses the same audio coding, data services, multiplexing and signalling schemes as DRM30, but uses a transmission mode optimised for those bands.

In the VHF bands, DRM+ can be configured to use less spectrum than current stereo FM broadcasts, whilst

additionally deriving the potential benefits of increased robustness, reduced transmission power, increased coverage or additional services.

DRM+ is the name applied to the DRM standard when used in the VHF frequencies.It is “DRM but at higher frequencies”.

Therefore, it has:
The same multiplex and signaling scheme.
The same OFDM design (with new parameters)
The same audio codecs

DRM+ is implemented in the standard as robustness mode E. Its spectrum usage parameters are determined from the internationally agreed norms in the FM band (88 to 108 MHz). Therefore it has an occupied bandwidth of 96 kHz and a frequency grid of 100 kHz.

DRM+ provides bit rates from 35 kbps to 185 kbps at SNRs from 2 dB to 14dB and, like DRM, permits up to four services. It is therefore a flexible solution allowing single or small numbers of audio services to be broadcast together.