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Method for selecting relay node in multi-relay wireless network

A relay node, wireless network technology, applied in wireless communication, electrical components and other directions, can solve problems such as insufficient network, achieve good feasibility and practicability, and reduce system time complexity and network overhead.

Inactive Publication Date: 2010-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, this is not enough for networks that require high-speed transmission

Method used

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  • Method for selecting relay node in multi-relay wireless network
  • Method for selecting relay node in multi-relay wireless network
  • Method for selecting relay node in multi-relay wireless network

Examples

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Embodiment

[0040] like figure 1 As shown, in this embodiment, N+2 nodes in a single-source single-sink multi-relay half-duplex system network are respectively source node s and N relay nodes r 2 , r 3 ,...,r N+1 and a single destination node d (r described below 1 , r N+2 also represent the source node and the destination node, respectively). The nodes in this ellipse area can all communicate with each other, and the channels between them are quasi-static independent smooth Rayleigh fading channels. The channel fading coefficients between the source node and the destination node, the source node and the relay node, the relay node and the destination node, and the relay node and the relay node are respectively set as where i=1, . . . , N, and i≠j. These channel fading coefficients are zero-mean and the corresponding variances are Cyclic symmetric, independent complex Gaussian random variables of . At the same time, in order to avoid information interference between different nod...

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Abstract

The invention relates to a method for selecting relay node in a multi-relay wireless network, belonging to the technical field of wireless communication. The method comprises the following steps: performing channel estimation after a destination node d receives pilot frequency information transmitted by all nodes, and selecting a relay node with the optimum channel gain therebetween as a destination node rd; judging whether all the nodes satisfy the decoding condition or not and classifying the nodes; comparing the downlink chain gain of the current node participating in collaboration with the downlink chain gain of candidate nodes participating in collaboration, using the one with larger gain as the node to participate in next collaboration, i.e., using the downlink chain gain of the nodes as the judgment condition of the relay nodes participating in collaboration next time until the destination node decodes successfully. The invention avoids high calculating complexity required for obtaining the optimum broadcast path of the system and can greatly reduce the time complexity and network expense in case that the performance requirement of the system is satisfied.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication, in particular to a method for selecting a relay node in a multi-relay wireless network. Background technique [0002] In multi-relay networks, the selection of relay nodes is an important branch of cooperative communication research, and it even determines whether cooperative communication networks can bring gains. In addition, because the high-frequency channel changes relatively quickly, the overhead of channel estimation and channel information feedback will reduce the network throughput. Therefore, it is necessary to study the distributed relay node selection method for the actual system, so as to ensure that the system is as good as possible. Transmitting information at a high rate can make the network overhead relatively small. [0003] After searching the existing literature, it was found that: [0004] 1. K.Azarian et al published a paper titled "On the achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/12
Inventor 李倩雯蒋铃鸽何晨占敖
Owner SHANGHAI JIAO TONG UNIV
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