Multithread bidirectional relay transmission method based on amplification forwarding

Abstract

The invention provides a multithread bidirectional relay transmission method based on amplification forwarding. The method comprises the following steps: (1) a relay antenna selection phase: two source nodes sends a training signal sequence to a relay node respectively, according to the received training signal sequence, the relay node estimates channel information between the relay node and the two source nodes respectively, two corresponding channel matrixes are obtained, according to the two channel matrixes, an antenna subset involving two users interaction communication is selected, complexity and forwarding energy consumption of a relay node processing signal is reduced, a diversity gain is obtained, and error code performance of a system is raised; (2) a bidirectional relay transmission phase: according to the selected antenna subset, the relay node carries out bidirectional relay transmission, and information interaction is completed. According to the invention, a high efficiency bidirectional communication strategy based on ANC (analog network coding) is employed, with regard to multithread transmission, an antenna selection scheme and a linear decoupling technique of a receiving signal are made, sending energy consumption and operation complexity are reduced, and a degree of freedom of a multiple-input-multiple-output bidirectional relay channel is effectively utilized.

Description

technical field [0001] The invention relates to a signal transmission method for spatial multiplexing of physical layer network coding, to be precise, to a multi-stream bidirectional relay transmission method based on amplification and forwarding, and belongs to the technical field of wireless communication. Background technique [0002] Two-way communication requires both ends of the communication to be able to send and receive information, and it is also a common means of communication; for example, real-time file interaction between users, video calls, and dedicated monitoring systems all require reliable two-way communication. Due to the geographical distance or the poor quality of the direct transmission channel, users who expect to achieve two-way communication are often unable to form a network by themselves to achieve reliable communication. At this time, relays are usually used to assist in completing two-way communication. Physical layer network coding utilizes the...

AI Technical Summary

Problems solved by technology

Moreover, for the relay, the hardware investment of the radio frequency unit is relatively expensive, while the antenna unit is relatively cheap, so antenna selection is undoubtedly a good way to reduce communication costs and improve transmission performance

However, the current antenna selection methods in multi-antenna systems are mainly proposed for point-to-point communication networks or one-way relay communication networks, and cannot be directly applied to two-way relay multi-antenna systems.

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