Communication in tunnel: Channel characteristics and performance of diversity schemes

This paper gives an overview of the theoretical and experimental approach which has been carried out in order to study the narrow band and wideband channel characteristics in a straight semi-arched tunnel. To improve the reliability of the link in terms of bit error rate and/or channel capacity, Multiple Input Multiple Output (MIMO) techniques have been proposed. Usually the efficiency of MIMO techniques is often compared to the performances of a Single Input Single Output (SISO) system, chosen as a reference. In this presentation, other diversity schemes at the receiving side as selection combining and maximum ratio combining are also considered since they have an easier implantation.