Wireless energy-carrying communication method based on OFDM amplification forwarding cooperative relay

Abstract

The invention discloses a wireless energy-carrying communication method based on OFDM amplification forwarding cooperative relay, and belongs to the field of cooperative communication. The method is realized based on a relay amplification forwarding system model, and comprises a source node S, a relay node R, a destination node D1 of the source node and a destination node D2 of the relay node. Thewireless energy-carrying communication process comprises two time slots, in the first time slot, a source node S broadcasts information outwards, a relay node R uses one part of subcarriers for information decoding, the other part of subcarriers are used for energy collection, and D1 receives information directly transmitted by the source node S. And in the second time slot, subcarrier pairing iscarried out, the relay node R forwards the information of the source node S to the destination node D1 by utilizing the energy collected in the first time slot and the paired subcarriers, and also forwards the information of the relay node R to the destination node D2 by utilizing the rest subcarriers. The cooperative relay technology and the wireless energy-carrying communication technology arecombined, the energy efficiency and the spectral efficiency of the transmission system are improved, and the overall performance of the system is improved.

Description

technical field [0001] The invention belongs to the field of cooperative communication, and relates to a wireless energy-carrying communication technology based on OFDM amplification and forwarding cooperative relay. Background technique [0002] OFDM is an orthogonal frequency division multiplexing system, which plays a very important role in wireless communication systems. In wireless information transmission, spectrum resources are very precious. Radio signals use radio waves as carriers and use the same frequency for communication. If we want to carry out multiple communications at the same time, then we need to have many different frequencies so that the various communications do not interfere with each other. The general principle of OFDM is that when high-speed information flows pass by, they are divided into many low-speed information flows, and then these low-speed information are allocated to different sub-channels for propagation. When the receiver receives thes...

AI Technical Summary

Problems solved by technology

This will lead to very low energy efficiency of relay nodes;

[0008] (3) TS requires accurate time synchronization because it needs to divide time slots accurately, which will increase the complexity of the algorithm

Since PS will reduce the signal-to-noise ratio of the cooperative system, it will lead to poor decoding ability of the system

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