Imperial College London > Talks@ee.imperial > COMMSP Seminar > Geolocation databases and white-space devices in UHF TV bands

Geolocation databases and white-space devices in UHF TV bands

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In recent years there has been a great deal of interest from both academia and industry in the use of UHF digital terrestrial TV (DTT) frequencies by so-called cognitive radios or white-space devices (WSDs). The high level of interest in this field has been counter-balanced by the obligation of national regulatory authorities worldwide to ensure that appropriate levels of protection are afforded to the incumbent DTT services. Much of the research in this field has been directed toward the operation of autonomous WSDs. These devices detect the presence of an existing DTT service via advanced spectrum sensing techniques, and only radiate where interference to the DTT service is deemed unlikely. The regulatory constraints on such autonomous WSDs can result in very stringent (low) WSD permitted radiated powers and required sensing levels, both applied uniformly at all locations. This reduces the utility of autonomous WSDs and increases their complexity. The above issue can be resolved if the WSDs operate with assistance from a geolocation database. This is because the impact of interference on a DTT receiver is linked to the quality of the DTT coverage in the geographical area where the DTT receiver is located. Therefore, the regulatory emission limits for a database-assisted WSD can be significantly increased in areas where the DTT SINR is high i.e., where the DTT coverage quality is good. This not only significantly improves the utility of the WSDs, but also removes the need for sensing. In this presentation we describe the detailed calculations which a geolocation database would need to perform in order to derive location-specific maximum permitted emission levels for WSDs.

This talk is part of the COMMSP Seminar series.

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