Power distribution method for reducing interruption probability in AF-DSTC collaboration communication protocol

Abstract

The invention relates to a power allocation method to reduce interruption probability with an AF-DSTC cooperative communication protocol in the wireless communication field, the method comprises the following steps: after receiving a message from a source node, cooperative nodes calculate the selection determinate factor SDP of the source node and determine whether the source node can participate a second communication process by the selection status according to the selection determinate factor SDP. The cooperative nodes feed back the SDP factor and the selection status to the source node. The source node allocates power to the cooperative nodes in accordance with messages fed back and broadcasts the power allocation information. The chosen cooperative nodes repeat the source information to target nodes by the allocated power. With low complexity in calculation, the invention can reduce dramatically the interruption probability of AF-DSTC cooperative communication and only the average value of the channel gain from a cooperative node to a target node is required.

Description

technical field [0001] The invention relates to a power distribution method in the technical field of wireless communication, in particular to a power distribution method for reducing interruption probability in an AF-DSTC (amplification and forwarding distributed space-time coding) cooperative communication protocol. Background technique [0002] The multi-antenna technology can greatly improve the capacity and reliability of the wireless communication system. In recent years, as an extension of multi-antenna technology, cooperative communication technology, in which single-antenna users cooperate to form a virtual antenna array, has attracted widespread attention from all walks of life. In the mobile communication system, each single-antenna mobile terminal can obtain the diversity gain similar to that in the multi-antenna technology by cooperating with each other, and improve the reliability of communication without increasing the cost of the terminal. It has a good appl...

AI Technical Summary

Problems solved by technology

[0004] In 2006, "DistributedSpace-Time Coding in Wireless Relay Networks" published by Yindi Jing et al. in "IEEE Trans.On Wireless Communications" ("Institute of Electrical and Electronics Engineers Wireless Communications") (Vol. Following Distributed Space-Time Coding in the Network), the AF-DSTC cooperative communication protocol is proposed: in the first stage, the source node broadcasts information to each cooperative node, and in the second stage, the cooperative node re-encodes the received information and sends it to target node, but the paper assumes that all cooperative nodes are in the same channel condition, and does not mention how to reasonably allocate power to each cooperative node according to the different channel information

This scheme can effectively reduce the interruption probability of the system and has low complexity. Its shortcoming is that the cooperative node must be able to decode the source node, and it can only be applied to the DF-DSTC protocol

Although the traditional equal distribution and optimal distribution methods are simple, they cannot effectively reduce the outage probability of the AF-DSTC system

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