Professional user radio systems come in a very wide range of forms and complexity. They vary from simple 'infrastructureless' systems in which users with handportable or vehicle-mounted radios talk only to each other, to systems that are more complex and sophisticated than present day digital cellular telephone systems. In this chapter we will look at how and why these different systems have evolved, their structure and how they operate. We will see how digital techniques are coming into use in these systems, and will review briefly the Trans-European Trunked Radio (TETRA) standard developed by ETSI for digital professional user radio systems.

Inspec keywords: mobile radio

Other keywords: digital professional user radio systems; digital techniques

Subjects: Mobile radio systems