EM Interference Analysis of the Fly's Eye Antenna System in Stadium Scenarios

Abstract

In this thesis the interference aspect of the Fly's Eye multi-beam antenna system of \cite{FlyEye}, a new base station concept to tackle the high data rate demands in spart stadiums is investigated. In particular the co-polar interference performance and the degree of multipath interference within the single spatial channel are considered. A tool is developed to quickly evaluate the co-polar isolation (CI) achieved by a given base station element pattern. With it the design described in \cite{MartaLens} is evaluated and it is found that the pattern achieves a CI of 11.2dB.
The single spatial channel of the system, stretching from the base station suspended above the pitch to the user terminal (e.g. a smartphone) held by the user located in the seating area of the stadium, is analyzed in downlink and applying a deterministic approach. Three frequencies - 120GHz, 25GHz and 5GHz - as well as the two separate cases of smooth and rough surface scatterers are considered.
The incident and scattered field of the main scatterers in the geometry are studied in the region in front of the user, where the terminal is likely to be held.
Further the received power for various terminal locations and orientation angles is evaluated.
It is shown that an antenna with directivity larger than 7dB is sufficient to effectively filter out any unwanted multipath. Further, allowing for more complex terminal antenna structures enables to implement the concept of direct NLOS and maintain connectivity in shadowed regions by pointing the antenna at the torso, although in the rough case the received power can still fluctuate about 10dB according to the location of the terminal.