Abstract
Multi-beam antenna technology can effectively mitigate the impact of deep fading caused by multipath propagation on communication quality through spatial diversity and increase the reliability of wireless mobile communication systems. At the same time, the multi-beam antenna with beamforming algorithm as the key technology can realize spatial division multiple access (SDMA) by automatically adapting the weight vector of the antenna array, enhance the expected value, and suppress the interference. A novel beamforming technology increases the inner circle beam width and reduces the outer ring beam width to minimize the difference between the internal and external cell link SNR. This study considers reducing the number of cells by reasonably allocating beams, which satisfies both the requirements of coverage link quality and the difficulty of forming antenna beams. This research subject applies the scheme and strategy of improving multi-beam antenna technology in the same system. Under the requirement of cell coverage and partitioning, the related technologies and strategies combining multi-beamforming technology and space-time block code technology can obtain high coding gain and diversity gain without sacrificing bandwidth and effectivelyx improve the wireless systematic capacity.
Highlights
Interference in high altitude platform station (HAPS) communication is another major factor affecting and limiting system performance in addition to channel fading
It includes both inter-symbol interference (ISI) due to signal multipath propagation and delay spread and co-channel interference (CCI) and adjacent channel interference within the network. These interferences will cause problems such as crosstalk, dropped calls, or reduced communication quality during communication, reducing user satisfaction with the service. The existence of these interferences limits the reuse of the system frequency domain, time domain, and code domain resources, which greatly hinders the improvement of system capacity
This study considers reducing the number of cells by reasonably allocating beams, which satisfies both the requirements of coverage link quality and the difficulty of forming antenna beams
Summary
Interference in high altitude platform station (HAPS) communication is another major factor affecting and limiting system performance in addition to channel fading. The basic idea of this type of joint technology is to use the different polarizations of the antennas to achieve the irrelevant channel, apply space-time block coding, and perform beamforming in each polarization direction.
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