An asynchronous random access method based on multi-satellite cooperative beamforming technology

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

Active Publication Date: 2022-08-02
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 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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  • An asynchronous random access method based on multi-satellite cooperative beamforming technology
  • An asynchronous random access method based on multi-satellite cooperative beamforming technology
  • An asynchronous random access method based on multi-satellite cooperative beamforming technology

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

[0059] like Figure 4 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 random access data packets without collision in time sequence from the forwarded signal of the double-star feeder link, and uses the preamble sequence to complete the time-frequency synchronization and channel estimation functions of the data packet; After satellite 1 and satellite 2 are time-frequency synchronized, whether the preambles are aligned in the two dimensions of time and frequency determines whether they are data packets transmitted by the same IoT terminal. Different time-frequency synchronization algorithms and channel estimation algorithms can be used in the present invention without creative work.

[0061] Step S2, the gateway ...

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Abstract

The present invention provides an asynchronous random access method based on multi-satellite cooperative beamforming technology, including time-frequency synchronization, collision detection, multi-satellite cooperative beamforming, and cooperative interference elimination; The characteristics of strong burstiness and short data packets, combined with the large number of visible satellites in the future giant low-orbit satellite constellation, alleviate the problem of "deadlock" that is prone to occur in the random access system under high load conditions; simulation results It is shown that the multi-satellite cooperative beamforming random access method proposed by the present invention has better throughput performance than the traditional pure ALOHA, slotted ALOHA, and the multi-satellite cooperative asynchronous random access scheme proposed by the predecessors.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and mainly relates to an asynchronous random access method based on a multi-satellite cooperative beamforming technology. Background technique [0002] With the penetration of IoT applications into all fields of human activities, in some areas of data collection in large-scale, cross-regional, harsh environments, etc., due to the limitations of space and environment, the Internet of Things on the ground is powerless, and there is a mismatch between service capabilities and needs. Phenomenon. The reason is 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, the deployment of base stations on the ground and the communication network connecting base stations are subject to many limitations: base stations cannot be established in ar...

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Application Information

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Patent Type & Authority Patents(China)
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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