700 MHz modelling

We undertook a number of modelling studies for Ofcom in 2014-2015, to inform their policy on technical conditions relating to the release of 700 MHz broadcast spectrum for mobile use.  The most likely band-plan involved the user equipment (UE) handsets transmitting at frequencies immediately above the remaining broadcast allocation, with base stations assigned spectrum higher[…]

DTT signal strength variability measurements

The aim of the study was to gain a better understanding of radio signal variability in different clutter types in order to aid the modelling of potential coexistence issues with DTT using the UK DTT planning model.   Using our survey vehicle extensive measurements at different antenna heights and locations were carried out to gain detailed understanding[…]

Impact of building materials on radio waves

There is an increasing expectation that wireless services should be ubiquitously available, with seamless connectivity whether the user is indoors or outdoors.  It is therefore important that the impact of buildings on the propagation of radiowaves be understood and reliably characterised.  Although many measurements have been made over the decades, it is not always easy[…]

In-home propagation measurements

The study provided coverage statistics for in-home propagation at different frequencies, and in particular obtained a comparison between coverage statistics at 2.4 GHz and 5.8 GHz. The background requirement was to understand the possible utility of UHF spectrum for Wi-Fi type applications, and to understand the opportunities and limitations afforded by the 5 GHz band[…]

Long duration propagation measurements

Following on from a previous study measuring equipment, that had been used to investigate the technical and consumer impact of time-varying interference to digital TV services, was maintained for a further year in Brighton and Southwold to monitor interfering signals and propagation variability from the continent.  In addition a series of associated measurements were made using[…]

Development of wide range propagation model

The  aim of the study, a major two-year project, was to develop a unified propagation model for the prediction of signal levels on terrestrial paths in a frequency range of approximately 30MHz–50GHz, considering both availability and interference, which covers times from 0–100%. The work required a fundamental re-evaluation of the statistical relationship between different propagation mechanisms.[…]

Point to area propagation above 3 GHz

This study was undertaken to develop ITU-R P.452 for use in point-area modelling above 3 GHz has been described in other requirements for this Label. This work included a fairly extensive measurement campaign also involving the Rutherford Appleton Laboratory and Durham University. The purpose of the measurement campaign was twofold; to give a basis for model development and provide[…]

Wideband impulse response measurements

Undertook a campaign to measure the wideband impulse response of the outdoor-to-indoor channel for the UK Space Agency.  The work was undertaken in the context of global positioning system design. A sliding correlator channel sounder was designed and constructed, operating at a chip rate of 100 MHz and a carrier frequency of 2.4 GHz.  Measurements[…]