Nujira’s award-winning technology powers the world’s highest efficiency Digital TV transmitter
Worldwide ‘digital switchover’ is leading to significant numbers of new digital terrestrial TV transmitters and systems being installed. However, with continual rise in energy prices and increasing concerns over environmental impact, it is important that these new transmitters are as energy-efficient as possible.
Operational costs have always been a key issue for broadcasters, and a substantial part of these costs is due to the electricity required to run the transmitters (typically accounting for over 75% of total electricity usage).
Aside from the cost argument for increased transmitter efficiency, there is also a strong desire from the broadcasters to improve their environmental or 'green' credentials and to be seen to be responsible in their use of energy.
Modern modulation schemes, such as Orthogonal Frequency-Division Multiplexing (“OFDM”) used in DVB-T systems have waveforms with high PAPR which result in limited efficiencies in these output stages – typically around 30%.
Nujira has developed Coolteq.u - a high power Envelope Tracking system that can be added to a conventional broadcast RF system topology providing significantly increased efficiency in the output stages: the combined efficiency of the output stage and the Coolteq.u components typically exceeds 40% across the whole DVB-T frequency band. The graph below shows the typical efficiencies achieved with Nujira’s Coolteq.u system.