High-energy-efficiency relay selection method in energy constraint cooperative communication system

A collaborative communication, energy-limited technology, applied in the field of communication, can solve the problems of power exhaustion, the energy resources of relay nodes cannot be fully utilized, etc., and achieve the effect of improving energy efficiency

Inactive Publication Date: 2013-10-23
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

For existing relay selection algorithms that only consider channel state information, relay nodes with better channel conditions are often ove

Method used

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  • High-energy-efficiency relay selection method in energy constraint cooperative communication system
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  • High-energy-efficiency relay selection method in energy constraint cooperative communication system

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: the present embodiment is implemented under the premise of the method of the present invention, has provided detailed embodiment and concrete operation step, but protection scope of the present invention is not limited to following the embodiment.

[0025] The model of the multi-source multi-relay cooperative communication system adopted by the present invention is as follows: figure 1 shown, where S 1 ,…S l ,...,S M is the set of source nodes, R 1 ,...R j ,...,R K is a set of relay nodes, D is a destination node, and the number K of relay nodes is not less than the number M of source nodes, that is, K≥M. Each source node selects only one relay node to communicate with the destination node, and each relay node serves only one source node. All communication nodes adopt single antenna and work in time division duplex mode.

[0026] refer to figure 2 , t...

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Abstract

The invention discloses a relay selection method in an energy constraint cooperative communication system. The relay selection method comprises the following realization steps that (1) M source nodes utilize K energy constraint relay nodes to carry out cooperative communication with target nodes D; (2) one relay node with the least rest energy is found and is marked as R*; (3) the life cycle T<S1R> of a link from S1 to R* to D is constructed; (4) the source nodes are ranked according to the T<S1R> in sequences from small ones to large ones, a new set S is obtained, a node counter is set, in addition, the initial value m of the node counter is set to be zero; (5) m is increased by 1, and the life cycle T<SmRj> of the link is constructed; (6) the relay node corresponding to the maximum value of the T<SmRj> is marked as Rm; (7) steps (5) to (6) are repeated until m is equal to M, the relay nodes Rm are ranked according to subscripts in sequences from small ones to large ones, and a new set R is obtained; and (8) the resource nodes in the set S are selected to carry out cooperative communication with the relay nodes with the same subscripts in the set R. The relay selection method has the advantages that the energy efficiency is high, the realization complexity is low, and the relay selection method can be used for the cooperative communication system in energy constraint environment.

Description

technical field [0001] The invention belongs to the communication field, and relates to a relay selection method of an energy-limited cooperative communication system, which can be used to improve the energy efficiency of a multi-relay cooperative communication system. Background technique [0002] Multiple-input multiple-output MIMO technology can make full use of space resources, and can effectively resist the fading of wireless channels without increasing the system bandwidth and transmission power, thereby improving the spectrum utilization of the communication system. However, in some practical application scenarios, such as the uplink of cellular systems, wireless ad hoc networks and wireless sensor networks, mobile terminals or network nodes are limited by their own size, complexity and power consumption, so it is difficult to directly apply MIMO technology. Therefore, a new space diversity technology - cooperative diversity technology emerges at the historic moment. ...

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Application Information

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IPC IPC(8): H04W40/22H04W52/04H04B7/04
CPCY02B60/50Y02D30/70
Inventor 高洋葛建华高明张南付少忠岳安军
Owner XIDIAN UNIV
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