7.2.3121 cell structure results
7.3.1Two-dimensional spatial interpolation beamformer (2D SIB)
7.3.2Design example of two-dimensional spatial interpolation filter
7.4High-Altitude Platform Cell Planning
7.4.1Coverage and cell partition of high-altitude platforms
7.5High-Altitude Platform Transmission Mechanism
7.5.1The introduction of related technologies
7.5.3Singular vector-based training method
7.5.4Steering vector-based training method
Chapter 8.Space-Based Cooperative Transmission System
8.1The Overview of Space-Based Transmission Technology
8.2Constellation Cooperative Multi-Beam Transmission Technology
8.3Constellation Cooperative MIMO System Modeling
8.3.1Single-antenna constellation
8.3.2Array antenna constellation
8.4Constellation-Cooperative MIMO System Capacity
8.4.2Single-antenna constellation capacity
8.4.3Array antenna constellation capacity
8.5Analysis of Factors Affecting Capacity of Constellation Cooperative MIMO System
8.5.1Single-antenna constellation
8.5.2Array antenna constellation
Chapter 1
Introduction
With the rapid development of wireless broadband communication and the swift progress in the Internet industry, mobile Internet is showing a booming trend with its unprecedented way to change people’s social lives and lifestyles, and it has become one of the necessary means for modern human information interaction. Traditional wireless communication is mostly based on ground-based cellular communication. However, with the continuous improvement of aerospace technology and the rapid growth of the types and quantities of space-based and air-based platforms, the space–air–ground integrated information network consisting of satellites, stratospheric balloons, and various aerospace vehicles is developing rapidly. The resulting space–air–ground integrated mobile Internet will become an information bridge for human beings to understand, enter, use, and develop space in the future.
Since the birth of wireless communication, the shortage of spectrum resources has been the biggest bottleneck restricting its development. The efficient use of spectrum resources and the development of the corresponding spatial multidimensional cooperative transmission technology have brought new growth points for future wireless communication and also provided theoretical and technical guarantee for the healthy development of the space–air–ground integrated mobile Internet in the future. This chapter will outline the characteristics and development history of ground-based, air-based, and space-based wireless communication.
1.1Overview of Ground-based Wireless Communication System
Since the concept of mobile communication was proposed by Bell Labs in the United States in 1947,1 mobile communication technology has made rapid progress in the past 30 years and has become one of the indispensable communication means in modern ground-based communication networks. In this section, we will first expound the development of the four generations of ground-based mobile communications and the corresponding key technologies.2
1.1.1The first generation of mobile communication system
