Downlink Performance of WiMAX Broadband from High Altitude Platform and Terrestrial Deployments sharing a common 3.5GHz band

A downlink performance of deploying WiMAX (IEEE802.16a) both from High Altitude Platforms (HAPs) and from terrestrial base stations sharing the 3.5GHz band is presented. It is shown how these two wireless communication configurations can coexist with either adjacent or overlaying coverage areas. The performance of each deployment is affected by factors such as transmission power, antenna beamwidth, the propagation model and thermal interference level. To improve performance, a HAP transmission power control strategy is presented to improve the coexistence capabilities of terrestrial and HAP systems. It is found that under these circumstances HAP systems can provide WiMAX overlay and not disturb an island of terrestrial coverage, while sharing the same frequency band.