Aiming at the high dynamic and low throughput of HAPS wireless communication system in network space, a channel transmission model of HAPS wireless communication system is proposed. Firstly, the antenna model is established based on the 3dB beamwidth characteristics of the antenna. Secondly, the throughput of the communication system is analyzed with the Shannon formula. The bit error rate of the communication system is studied by using Markov chain attributes. Simulation results show that the

more »

... roposed model is better than the traditional HSDPA transmission model in terms of performance such as throughput and bit error rate, and the proposed model is reasonable and effective. Keywords high altitude platform station; transmission model; high dynamic; bit error 1. Introduction High Altitude Platform Stations (HAPS) is a platform that stays in the adjoining space at a height of 20km to 50km and is stationary relative to a specific location on the earth. It can be seen as a communication system between a land-based communication system and a satellite communication system, aiming to develop the potential for a high degree of space between land and space benefits, increase communication capacity and spectrum utilization, reduce system equipment cost and complexity. HAPS has a smaller path fading than terrestrial communication systems and has a smaller delay than satellite communication systems [1-3]. Research on the HAPS communication system began in the 1960s. The U.S. Echo satellite project facilitated the passive reflection of broadcast signals with large balloons in orbit [9-10]. With the development of airship technology, countries have successively launched airship-based communication system research projects or carried experiments, mainly including: North American SHARP, Sky Station, HALO, European HALE, HeliNet, CAPANINA, HAPCOS, Japan's SkyNet, etc. [4-5]. The technology involved in the near-space platform communication system is very complex and a new set of industry standards needs to be developed. The main research results at home and abroad include: 1) Research on platform mobility. Literature [6-7] studies the potential problems that platform mobility brings to communication performance. 2) Research on multi-beam cell partitioning. In [8-9], three multi-beam coverage schemes have been studied and proposed. 3) Platform antenna design. To achieve multi-beam coverage, multiple beam antennas are used in the near-space HAPS. Because HAPS communication has many advantages that traditional wireless communication facilities (such as terrestrial and satellite communication systems) do not have, the use of high-altitude platform wireless communication systems has become the focus of attention in the world. Using multiple high-altitude communication platforms with the same bandwidth to serve a common area can greatly increase user capacity and improve spectrum utilization [10-11]. Several kinds of HAPS spot beam structure channel assignment algorithms have been tested in [12-13], and ground algorithms, especially beam overlap,