Investigation of mobile antenna diagrams on cochannel interference

One of the most decisive factors for the quality of service in cellular mobile radio systems is the co-channel interference ratio (C/I), the required carrier signal power divided by the interference power from cochannels. Known methods of improving the C/I include an appropriate choice of the cluster size, directional antennas at the base station and/or steerable directional antennas at the (semi) mobile station. This paper for the first time presents a comprehensive investigation of randomly orientated, directional mobile antennas. This shows some important tradeoffs being of particular importance for the design of cellular picocell systems supporting mobiles with handhelds.