DTG Testing reveals challenges facing DTT receivers in White Space networks

UK communications regulator Ofcom has published details of DTG Testing research into the effects of White Space wireless networks on popular digital TV receivers.

Ofcom commissioned DTG Testing to discover if digital terrestrial television (DTT) equipment can function alongside proposed White Space wireless networking devices.

The research tested 50 receivers from the DTG Zoo (a collection of over 420 receivers) against the White Space Device (WSD) signals.

A selection of 35 DTT receiver chassis was made based on receivers encountered by Ofcom in consumers’ homes during field trials in Glasgow, Watford and Margate, and the remaining 15 receivers were chosen based on sales data.

The receivers were fed test signals emulating the UK’s DVB-T networks (as used by Freeview and YouView) alongside WSD master and slave devices communicating in different modes to measure the best and worst case scenarios for DTT coexistence.

Richard Carlton, associate director of DTG Testing, said: “The DTG is proud to support Ofcom and the industry through the unique facilities and expert knowledge of DTG Testing, and the work of the Dynamic Spectrum Access Forum.”

White Space networks would occupy currently-unused radio spectrum alongside the frequencies used for digital terrestrial TV and wireless performance equipment.

Ofcom has proposed a dynamic spectrum access system, where smart WSDs would check against a database of existing spectrum users to find available radio frequencies.

DTG Testing’s research is part of an ongoing pilot scheme to test different aspects of dynamic spectrum access, with a further Ofcom report due in early 2015.

DTG Staff  |  18.12.2014

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