Relay selection method based on multi-source multi-relay wireless network power minimization

Abstract

A relay selection method based on multi-source multi-relay wireless network power minimization comprises the following steps that 1 each relay node senses channel gain from a sending node to the relay node and channel gain from the relay node to a destination node then informs the channel gain and the maximum sending power of the relay node to the sending node; 2 each source node calculates minimum sending powers of a next source node and the relay node under the condition that the outage probability requirement is met; 3 each user needs to select one relay node to enable the total transmission power of a whole system to be minimum for a wireless communication network; 4 the maximum sending power of the source node i and the relay node j is calculated according to the outage probability of a channel from a user i to the destination node D under the condition that channel interruption does not occur; 5 the user i selects the relay node enabling benefit to be maximum so as to facilitate information transfer. According to the relay selection method, the relay node minimizing total transmission power of the system serves as the source node in a Rayleigh fading channel.

Description

technical field [0001] The invention belongs to the communication field, in particular to a method for selecting a suitable relay node for a multi-source multi-relay network to optimize the total system transmission power. Background technique [0002] In wireless broadband services, cooperative communication is considered to be an effective technique to improve spectral efficiency and spatial diversity. Most cooperative communication models use single or multiple relay nodes to forward information from source nodes to destination nodes. In these relay networks, amplify-and-forward and decode-and-forward are the two most commonly used relay protocols. For a relay network, the transmission power of different source nodes and relay nodes is not exactly the same. If the source node can select an appropriate relay node when communicating with the destination node, then the spectrum efficiency and energy efficiency of the entire network will increase substantially. Therefore, ...

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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing multi-source multi-relay network, the total transmission power of the nodes is relatively large, the operation complexity is high, and the hardware equipment is relatively high, the present invention provides a decoding and forwarding relay network, for the existence of Swiss How to select a relay node in a fading channel to minimize the total transmission power and maximize the system benefit. Relay selection method for power minimization of multi-source multi-relay wireless network

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