Wireless energy-carrying communication method based on ofdm decoding and forwarding cooperative relay system

Abstract

The invention relates to a wireless energy-carrying communication method based on an OFDM decoding and forwarding cooperative relay system, which belongs to the field of cooperative communication. The method is implemented based on a relay decoding and forwarding system model, including 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. The communication process includes two time slots. In the first time slot, the source node S broadcasts information; the relay R uses a part of subcarriers for information decoding, and another part of subcarriers for energy harvesting. In the second time slot, pairing of subcarriers is performed first, and each subcarrier is allocated. The relay R forwards the information of the source node S to the destination node D1 using the energy collected in the first time slot and the paired subcarriers. At the same time, the relay node R also uses the rest of the subcarriers to transmit its own information to its own destination node D2. The invention combines the cooperative relay technology with the wireless energy-carrying communication technology, improves the energy efficiency and spectrum efficiency of the transmission system, and improves the overall performance of the system.

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 decoding 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 these inf...

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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