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Data transmission method based on cooperation between ships in VDES system

A technology for data transmission and system parameters, applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc., and can solve problems such as limitations

Active Publication Date: 2019-09-27
山东星通易航通信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned method is limited to solve the above-mentioned problems existing in the communication between the ship and the satellite

Method used

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  • Data transmission method based on cooperation between ships in VDES system
  • Data transmission method based on cooperation between ships in VDES system
  • Data transmission method based on cooperation between ships in VDES system

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, in a kind of VDES system disclosed by the present invention, the data transmission method based on cooperation between ships comprises the following steps:

[0039] Step 1: Setting of VDES system parameters; when data is transmitted between ship A and satellite B, it is assumed that there are L ships within the communication radius of ship A, respectively numbered as ship 1 , ship 2 ,L ship L , where the i-th ship is denoted as ship i , i∈{1,2,L,L}; the uplink communication frequency between the ship and the satellite B is f 1 , the downlink communication frequency is f 2 ; The communication frequency between ships is f 3 ; The uplink channel coefficient from ship A to satellite B is h A,B , the downlink channel coefficient from satellite B to ship A is h B,A ; ship ship i The uplink channel coefficient to satellite B is Satellite B to ship i The downlink channel coefficient of is Ship A to ship ship i , ship i The channel coeff...

Embodiment 2

[0066] Embodiment 2 (experimental example)

[0067] The following is a simulation experiment for the method of the present invention to illustrate the effectiveness and feasibility of the method of the present invention. The simulation experiment assumes that all channels are independent Rayleigh fading channels, and the channel coefficient i, j represent ships or satellites, g i,j Obeys a circularly symmetric complex Gaussian distribution with a mean of 0 and a variance of 1, d i,j Indicates the distance between the corresponding nodes i and j, and υ is the path loss coefficient. The simulation parameters are set as the distance between all satellites and ships is 600km, the distance between all ships is 1km, and the path loss coefficient υ=4. The variance of all additive Gaussian white noise is equal to 1, that is and The signal transmission power of all ships to the satellite is 110dB×p t , the signal transmission power of all satellites to ships is 110dB×p t ,Rig...

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Abstract

The invention relates to the technical field of wireless communication, in particular to a data transmission method based on cooperation between ships in a VDES system, and the method comprises the following steps: setting VDES system parameters, wherein the data transmission based on cooperation between the ships comprises uplink data transmission and downlink data transmission. The uplink data transmission comprises the following steps: selecting an uplink relay ship; and carrying out uplink data transmission according to the selection result of the uplink relay ship. The downlink data transmission comprises the following steps: selecting a downlink relay ship; and performing downlink data transmission according to the selection result of the downlink relay ship. Compared with an existing method for optimizing the performance of a single channel, the method has the advantage that the problem of poor communication quality between a satellite and a ship is solved by utilizing a multi-channel transmission diversity forming method. Particularly, when the channel quality from a ship to a satellite is extremely poor and the ship needs to send an emergency signal to the satellite, the method disclosed by the invention can play an important role.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a data transmission method based on inter-ship cooperation in a VDES system. Background technique [0002] Ship Automatic Identification System (AIS) is a marine VHF broadcasting system. A ship equipped with AIS can broadcast its position, speed, course and some registration parameters of the ship to nearby ships, land-based base stations and satellite broadcasts in a timely manner. , so that the surrounding ships can avoid in time. At the same time, the relevant maritime management units and institutions can also quickly obtain the distribution and operation information of the ships and manage the ships according to these information. Therefore, AIS plays a very important role in ensuring the safety of ship navigation and improving maritime traffic management. [0003] With the globalization of the economy and the prosperity of maritime trade, the number of ship...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/024H04B7/026H04B7/185H04W40/12H04W4/90
CPCH04B7/026H04B7/024H04B7/18523H04W40/12H04W4/90Y02D30/70
Inventor 李洪星丁大为智慧张红伟
Owner 山东星通易航通信科技有限公司