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Relay node distribution method in unmanned aerial vehicle (UAV) relay multi-hop communication system

A multi-hop communication and relay node technology, which is applied in the field of UAV communication, can solve problems such as complex calculations, intuition, and inability to obtain closed-form solutions to optimization problems, so as to improve communication quality, reduce computational complexity, and achieve good results. The effect of engineering reference

Inactive Publication Date: 2018-06-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] In the existing methods, most of the numerical solutions can only be obtained through numerical simulation, and then analyzed and discussed based on the numerical solutions and images, and the closed-form solution of the optimization problem cannot be obtained, which is not intuitive enough, and the calculation is more complicated

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  • Relay node distribution method in unmanned aerial vehicle (UAV) relay multi-hop communication system
  • Relay node distribution method in unmanned aerial vehicle (UAV) relay multi-hop communication system
  • Relay node distribution method in unmanned aerial vehicle (UAV) relay multi-hop communication system

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[0027] The technical solution of the present invention will be described in detail below according to the accompanying drawings.

[0028] Technical steps: a method for deploying relay nodes in a UAV relay multi-hop communication system of the present invention includes the following steps:

[0029] Step 1. Build as figure 1 The model of the UAV relay multi-hop communication system shown assumes that the relay forwarding mode is decode-and-forward (DF), and that the signal obeys the Rayleigh fading distribution during transmission.

[0030] Step 2. Use the outage probability of the mobile station to construct the objective function, and then construct the restrictive conditions based on the distance between the base station and the mobile station, so as to transform the UAV relay deployment problem into an optimal mathematical model. The specific operation is as follows figure 2 shown.

[0031] Step 3. Simplify the objective function of the optimization model by utilizing th...

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Abstract

The invention discloses a relay node distribution method in an unmanned aerial vehicle (UAV) relay multi-hop communication system, and provides a UAV relay position distribution method based on an outage probability minimum criterion under a Rayleigh fading channel. The method comprises the following steps: firstly, building a target function by using the outage probability of a mobile station, and building a limiting condition according to the distance between a base station and the mobile station in order to transform a UAV relay distribution problem into an optimal mathematic model; secondly, simplifying the target function of an optimal model by means of the monotonicity of an exponential function and the hypothesis of a relation between the distance from the relay UAV to the base station and the height of the relay UAV; and lastly, solving a convex optimization problem by using a conventional KKT (Karush-Kuhn-Tucker) optimizing condition to obtain a closed-form solution of a bestUAV position. Thus, the calculation complexity is lowered under the condition of keeping the calculation accuracy, and a good engineering reference is provided for the design and optimization of a UAVrelay communication system.

Description

technical field [0001] The invention relates to wireless relay communication technology and unmanned aerial vehicle technology, and belongs to the technical field of unmanned aerial vehicle communication. Background technique [0002] In recent years, UAVs have been widely used in military and civilian fields due to their advantages such as good maneuverability, flexible deployment and control, and large coverage of high-altitude operations. It can be used for battlefield reconnaissance, weather monitoring, forest fire detection, traffic control, as well as cargo transportation, emergency search and rescue, etc. In various applications, using UAV as a relay platform for wireless communication is a research hotspot in the current communication field. Especially when the wireless communication link cannot be established due to the distance between the base station (BS) and the mobile station (MS) due to factors such as too far away or obstructions, using UAV as a communicatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/22H04W16/26H04W40/20H04W40/22H04B7/155
CPCH04B7/15507H04W16/22H04W16/26H04W40/20H04W40/22Y02T10/40
Inventor 韦薇颜俊朱卫平
Owner NANJING UNIV OF POSTS & TELECOMM
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