Improved circular straight cone channel model for high altitude platform in urban environment

To revise the fallacies of the straight circular cone channel model for high altitude platform (HAP), an improved model is proposed by introducing the concept of blockage theory. The improved model successfully revised the wrong delay spread in the straight circular cone channel model and provided the revised delay spread, which is consistent with measured data. The improved model also gives the existing probability of single bounce echoes in three-dimensional space, which is also useful in other analysis of multipath effects. The revised cumulative distribution function, the power spread profile and the coherence bandwidth is obtained by applying the improved model, which proves the new model is more approximate to actual situations and more accurate in the analysis of the channel for HAP.