Analysis of interference to cable television due to mobile usage in the Digital Dividend

The start of use of mobile applications in the 800 MHz band, which forms part of the ‘Digital Dividend’, will cause interference to TV signals under certain conditions. The new mobile applications (called LTE, Long Term Evolution) use frequencies also used in cable TV networks. This report examines how much interference may occur when providing digital television over cable networks

Onderzoek naar storing op kabeltelevisie door mobiel gebruik in het Digitaal Dividend

De introductie van het gebruik van mobiele toepassingen in de 800 MHz band, die onderdeel vormt van het zogenaamde digitaal dividend, leidt onder bepaalde omstandigheden tot een verstoring van tv-signalen. De nieuwe (LTE) mobiele toepassingen gebruiken frequenties die ook worden toegepast in kabel-tv-netwerken. Dit rapport gaat in op de mate waarin deze storing kan plaatsvinden in het (digitale) televisie aanbod van de kabel.\u

Comparison of UHF measurements with the propagation model of Recommendation ITU-R P.1546

This report describes a radio propagation measurement campaign that has been performed along paths between the Netherlands and the United Kingdom. The campaign focused on UHF propagation on mixed land/sea paths. Special attention was given to calibration accuracy and validation of the measurement data. The result is a highly accurate and very extensive set of measurement data, that can be used for validation of existing propagation models and models being (re)developed. Inaccuracies in the model have been indicated by several parties since the introduction in 2001 of the propagation model of Rec. ITU-R P. 1546, specifically on paths where radio waves travel partly over land and partly over sea. This research seeks to check the existence of these inaccuracies and assess their impact. Furthermore an analysis is made of possible causes in order to initiate discussion on how to correct them. The measurement results have been compared with calculations using the propagation model of Recommendation ITU-R P.1546-4. The differences between the model and measurements have been analyzed to obtain conclusions on the existence and the magnitude of the error

Mixed-path trans-horizon UHF measurements for P.1546 propagation model verification

An extensive propagation measurement survey was performed between The Netherlands and the United Kingdom. Seven mixed land/sea paths were monitored simultaneously, with path lengths ranging from 55 to 370 km. Eight frequencies between 500 and 700 MHz were used. Over 21 million measurements were collected during 500 days. This paper describes the survey and actions taken to assure high data quality. Detailed results are provided and can be used as propagation model test vectors. These results are compared with predictions of the ITU-R Rec. P.1546-4 propagation model. The results are disappointing: differences of up to 20 dB are found. Suggestions are made for improvement of the model