Joint relay selection-based communication method in bidirectional delay network

Abstract

The invention discloses a joint relay selection-based communication method in a bidirectional delay network, and belongs to the field of wireless communication. The method comprises that: 1) source nodes respectively send pilot symbol sequences to all relay nodes; 2) the source nodes respectively receive pilot signals amplified and forwarded by all the relay nodes, and estimate an effective signal to noise ratio; 3) the source nodes determine an optimal relay node according to the effective signal to noise ratio; 4) the source nodes perform differential modulation coding on signals to be sent, and send the signals to the optimal relay node; 5) the optimal node amplifies received signals, and forwards conjugate values of the signals to all the source nodes; 6) the source nodes receive the signals forwarded by the optimal relay node, and eliminate interfering signal terms in the received signals; and 7) the source nodes differentially decode the signals treated by the last step. The joint relay selection-based communication method in the bidirectional delay network can exchange information among a plurality of the source nodes without channel state information, so that the performance of the system is greatly improved.

Description

technical field The invention relates to a communication method based on joint relay selection applied in a two-way relay network, belonging to the field of wireless communication. Background technique Two-way relay communication is one of the research hotspots in the field of wireless communication. In a two-way relay network, two source nodes exchange information with the assistance of one or more relay nodes, and the data transmission can adopt different transmission strategies, which can generally be completed in four, three or two time slots . For the four-slot transmission mechanism, source node 1 sends information to source node 2 in the first two time slots, and source node 2 sends information to source node 1 in the next two time slots. This transfer mechanism is less efficient. For the three time slot transmission mechanism, the source node 1 and the source node 2 send the information to be exchanged to the relay node in different time slots, and the relay nod...

AI Technical Summary

Problems solved by technology

These issues pose great challenges to the design of differential modulation schemes in bidirectional relay networks

Images