Data Receivers for the TETRA System

TETRA stands for Trans European Trunked RAdio (or TErrestrial Trunked RAdio) and is a pan-European standard for digital land mobile radio, built primarily to meet the demands from emergency services like police, fire brigade, Falck, etc. TETRA uses the modulation scheme "symmetrical differential 4-phase modulation", often called Pi/4-DQPSK. The overall objective of the project has been to analyse alternative types of detectors, non-coherent as well as coherent, for the TETRA system under realistic channel conditions. Employing the earlier established COSSAP simulation platform for the TETRA system, investigations have been carried out during 2000 within two areas: " Two Branch Diversity Combining Using Non-Coherent Differential Detectors" and "Turbo Coding Used as Channel Coding Principle in Mobile Communications Using TETRA as a Test System". (Johan Brøndum)