Overview


The LINK Personal Communications Programme (PCP) was established to investigate the implications and impact of an expanding mobile communications market.  These web pages provide access to the final report of the LINK project entitled Electromagnetic Compatibility Aspects of Radio-based Mobile Telecommunication Systems which addressed the implications to electromagnetic compatibility of current and third generation mobile radio systems.

The objective of this study was to determine and quantify the potential for unwanted electromagnetic interactions from mobile communication devices to surrounding electrical systems and suggest practical mitigation techniques where appropriate.  The study was also to consider the projected future usage of mobile communications and technology such that the future threat could be assessed

Only mobile communication devices were to be considered in this study as fixed installations should be controlled and regulated in accordance with existing guide lines.  Also only interactions with electrical systems were to be considered,  personal safety issues were only considered in the context of the consequence of interference with an electrical system.  The unwanted interaction of EM signals with electrical systems can be considered as three separate steps:

    1.  The characteristics of the incident EM signal.
    2.  How the incident signal is coupled into the victim electrical system.
    3.  The characteristics of the EM energy needed to interfere with the electrical system.

The characteristics of an EM signal will include many different parameters,  i.e. peak level,  average level,  total energy,  frequency,  modulation,  etc.  The EM emissions from a single communications device are well regulated and thus can be accurately characterised.  However if more than one device is operated in close proximity the individual emissions will interact to generate a combined EM environment.  This combined environment is unlikely to be a simple addition of the individual sources it represents as relative distances,  signal frequency and phasing will all determine the resultant environment.  Being able to define the EM environment when more than one mobile communications device is in operation is considered to be a major component of this work programme.

EMC Aspects of Radio-based Mobile Telecommunications Systems originally gained approval in March 1995 and work commenced in April 1996.  The project was funded under the LINK PCP with the DTI and EPSRC providing half of the funding and the industrial partners providing the other half.  The total funding was approximately £370,000 over the three and a half year project.