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

A beamforming and random access technology, applied in synchronization devices, baseband systems, baseband system components, etc., can solve problems such as inability to demodulate colliding data packets, deadlock, etc., and achieve the effect of improving throughput and alleviating deadlock.

Active Publication Date: 2020-12-18
NANJING UNIV OF POSTS & TELECOMM +1
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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 collide

Method used

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

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with the accompanying drawings.

[0059] Such as figure 1 The shown asynchronous random access method based on multi-satellite cooperative beamforming technology includes the following steps:

[0060] Step S1, the gateway station captures the preamble sequence of the random access data packet without collision in time order from the forwarded signal of the dual-star feeder link, and uses the preamble sequence to complete the time-frequency synchronization and channel estimation functions of the data packet; the gateway station according to After the time-frequency synchronization of satellite 1 and satellite 2, whether the preamble is aligned in time and frequency dimensions determines whether it is a data packet transmitted by the same IoT terminal. Different time-frequency synchronization algorithms and channel estimation algorithms are used in the present invention without inventive effort.

[00...

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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 ...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W56/00H04L25/02H04L25/03H04B7/185H04B7/06
CPCH04W74/0833H04W56/001H04L25/0224H04L25/03006H04B7/18528H04B7/0617H04L2025/03611
Inventor 洪涛席博丁晓进张更新
Owner NANJING UNIV OF POSTS & TELECOMM
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