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A Relay System Power Control Method Based on Statistical Channel State Information

A channel state information and relay system technology, applied in power management, wireless communication, electrical components, etc.

Active Publication Date: 2020-06-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The relay system power control method of the present invention, on the one hand, solves the problem of power control in the case of a multi-relay system with path delay difference, and on the other hand, uses statistical channel state information to ensure system performance in a fast fading environment

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  • A Relay System Power Control Method Based on Statistical Channel State Information
  • A Relay System Power Control Method Based on Statistical Channel State Information
  • A Relay System Power Control Method Based on Statistical Channel State Information

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Embodiment Construction

[0039] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0040] The system structure of relay system power control method based on statistical channel state information is as follows: figure 1 , for a rhombus relay system with N+2 nodes, the source node S first broadcasts the signal to the relay node R 1 , R 2 ,...,R N ; N relay nodes R i After the signal is decoded, the correctly decoded signal is forwarded to the destination node D at the same time; the node D receives the multi-channel superimposed signal with random phase difference, outputs the local received signal-to-noise ratio and makes a judgment, if the signal-to-noise ratio is lower than the preset Threshold gamma th , an interruption occurs.

[0041] This example is based on figure 2 The algorithm flow chart is given. The relay system obtains the channel fading factor by collecting the statistical channel state information of the comm...

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Abstract

The invention discloses a relay system power control method based on statistical channel state information. The method comprises the following steps: firstly, establishing a multi-relay cooperative communication system framework with path delay, and establishing a power control optimization problem model shaped like symbolic programming by taking minimization of the interruption probability of a relay system as a target; carrying out variable substitution, linear approximation and piecewise linear approximation on the symbolic programming problem, and converting an original problem into a mixed integer linear programming problem which is easier to solve; and finally, obtaining an optimal power control coefficient of all relay nodes by utilizing a global optimal algorithm. According to themethod, for the multi-relay cooperative communication system with time delay, the power control optimal solution is obtained on the basis of statistical channel state information of all links, the communication overhead is low, and the robustness to a fast fading channel is high.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a relay system power control method based on statistical channel state information. Background technique [0002] In view of the fading characteristics of wireless channels, diversity technology is a commonly used method to combat fading and improve receiving performance. In the relay system, multiple relay nodes cooperate to help the source node forward signals to the destination node, so as to achieve cooperative diversity, and have many advantages such as low transmission power, large communication range, and wide application scenarios. [0003] Power control is a classical communication system performance optimization method. However, the existing relay system power control methods generally consider how to increase the system capacity. These methods are based on the instantaneous channel state information of the system, and each communication node...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/24H04W52/30H04W52/46
CPCH04W52/24H04W52/241H04W52/30H04W52/46
Inventor 谢磊陈惠芳赵越王匡
Owner ZHEJIANG UNIV
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