Wireless communications using distributed antenna networks- Part B: Distributed network design for in-building and tunnel coverage

An efficient distributed antenna system has been designed to provide in-building mobile coverage. Part A of the paper describes several assumptions that are taken into consideration for estimating uplink and downlink performances. Our system specifications based on TETRA ensure that the received signal is at least 5 dB higher than the TETRA dynamic sensitivity level. Our study found that the designed system provides more than 10 dB system margin under worst case scenario. The design is based around a common point of interconnect feeding a backbone coaxial system to distribute signals around the building. The floor distribution splitters and cables located on each floor are used to feed required signals to the designed ceiling antennas and radiated cables for mobile coverage. Handover overlap design in tunnels and open areas are also made. Calculated and measured signal strengths, noise levels and system losses are analysed and found them in compliance with the given specifications.