Downlink Coexistence Performance Assessment and Techniques for WiMAX Services from High Altitude Platform and Terrestrial Deployments

Abstract

We investigate the performance and coexistence techniques for worldwide interoperability for microwave access (WiMAX) delivered from high altitude platforms (HAPs) and terrestrial systems in shared 3.5 GHz frequency bands. The paper shows that it is possible to provide WiMAX services from individual HAP systems. The coexistence performance is evaluated by appropriate choice of parameters, which include the HAP deployment spacing radius, directive antenna beamwidths based on adopted antenna models for HAPs and receivers. Illustrations and comparisons of coexistence techniques, for example, varying the antenna pointing offset, transmitting and receiving antenna beamwidth, demonstrate efficient ways to enhance the HAP system performance while effectively coexisting with terrestrial WiMAX systems.

CINR Performance of Downlink Mobile WiMAX IEEE 802.16e Deployed Using Coexistence Cellular Terrestrial and HAPS

“…In practice, there is unavoidably power spilling outside the coverage area, which can cause interference to other cells. In this paper, we employ a directive antenna pattern in [1], [2], [20]- [22], which can ensure more power radiated in the desired directions and decrease the power radiated towards undesired directions, on both the HAPS and ground user [23]- [26]. Antenna models are presented in (1) and (2), respectively.…”

Deployment and Capacity of Mobile WiMAX from High Altitude Platform

“…Knowing the size of the channel and capacity, the radius of the area supported by each modulation is obtained. The total capacity of an aerial system with 19 cells inside the coverage area can be calculated in (6). The individual cell DL and system capacity of an aerial platform with 19 cells are calculated in Table IV.…”

“…Percentage of area covered by different modulation schemes in the whole coverage area and in central cell can be obtained by using a cumulative distribution function (CDF) of SNR. Multiple cell deployment inside HAP coverage area[6] …”

Energy Per Useful Packet Optimization on a TDMA HAP Channel

“…where P r is the received power, M l is the link margin compensating the hardware process variations and other additive noise, and G 1 is the gain factor at d = 1 m. G 1 depends on the antennas efficiency and orientation, and on the signal frequency [2], [11]. κ = 2 and G 1 = 30dB will be assumed for this paper, modeling a free space propagation.…”

“…Once more, it is noticeable that the analytical values are accurate enough to model the proposed system. The analytical values of 1 − Q R+1 were obtained from (4); as for E[D], they were obtained from (11). It is perceivable that the delay for C-ARQ and for the proposed H-ARQ system with R = 2 is the same; however the success probability 1 − Q R+1 is different, favoring the proposed H-ARQ system.…”