Relay selection and power distribution method for amplifying-and-forwarding collaborative network

Abstract

The invention provides a relay selection and power distribution method for an amplifying-and-forwarding collaborative network. The amplifying-and-forwarding collaborative communication network is built and comprises a source node S, a destination node D and N backup relays from R1 to RN. A transmission process is divided into two phases, wherein in the first phase, signals x are broadcast to all the backup relays through the source node S; in the second phase, best relay selection and power distribution are carried out, and information is forwarded to the destination node through the selected best relay. According to the method, the source node does not need to know instant channel state information of all channels; only after the backup relays feed back instant channel state information of one hop of two hops of links where each backup relay is located, can the backup relays be selected, feedback cost is little and the method is easy to achieve.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a relay selection and power allocation method, in particular to a relay selection and power allocation method based on partial channel state information under the Amplify-and-Forward (AF) protocol . Background technique [0002] Cooperative communication technology introduces space diversity by sharing resources such as spectrum with multiple single-antenna users independently distributed in the wireless network, so as to obtain the same system performance as the MIMO system, which is one of the important means to combat multipath fading and improve communication quality one. However, the improvement of its system performance is at the cost of increasing system complexity and feedback load. For example, in order to enable the relays to cooperate effectively, the central node may need channel state information (Channel State Information, CSI) of the relays distributed through...

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Problems solved by technology

[0004] However, in order to perform relay selection, on the one hand, traditional methods often require a central node (such as a source node) to know the real-time channel state information of all relay channels in the network

As the number of relays in the network increases, this method will bring a heavy feedback burden to the communication system, and the required feedback load is often unbearable, so it is difficult to apply in practical systems

On the other hand, some existing relay selection methods only use limited channel state information (such as only known "source-relay" link CSI) for relay selection, lack of full use of channel conditions, the obtained There is a significant gap between the system performance and that obtained with the full CSI known

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