Asynchronous random access method based on multi-satellite cooperative beam forming technology

Abstract

The invention provides an asynchronous random access method based on a multi-satellite cooperative beam forming technology. The asynchronous random access method comprises the steps of time-frequencysynchronization, collision detection, multi-satellite cooperative beam forming and cooperative interference elimination. Aiming at the characteristics of mass connection, strong burstiness and short data packets of services in the satellite Internet of Things, and in combination with the characteristic that the number of visible satellites of a future giant low-orbit satellite constellation is large, the problem that deadlock is likely to occur in a random access system under the high-load condition is relieved; simulation results show that compared with a traditional pure ALOHA, a time slot ALOHA and a multi-satellite cooperative asynchronous random access scheme proposed by a former person, the asynchronous random access method provided by the invention has better throughput performance.

Description

technical field [0001] The invention relates to the technical field of wireless communication, and mainly relates to an asynchronous random access method based on multi-satellite cooperative beamforming technology. Background technique [0002] As the application of the Internet of Things penetrates into various fields of human activities, in some fields of data collection such as large-scale, cross-regional, and harsh environments, due to space and environmental constraints, the ground Internet of Things is helpless, and there is a mismatch between service capabilities and needs. Phenomenon. The reason is mainly that for the Internet of Things that relies on wireless access, in addition to the Internet of Things terminals, there must also be a communication network composed of enough base stations. However, there are many restrictions on the deployment of base stations on the ground and the communication network connecting base stations: it is impossible to establish base ...

AI Technical Summary

Problems solved by technology

However, this scheme believes that the data packets received by multiple satellite nodes must not collide on a certain satellite, and then the SIC technology can be used to iteratively recover more collided data packets. If the data packets are transmitted and collided on multiple satellites, A "deadlock" phenomenon occurs, such as image 3 As shown, the proposed algorithm cannot demodulate collided packets

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