Energy capture cognitive radio communication method based on transmission after listening

Abstract

Provided is an energy capture cognitive radio communication method based on transmission after listening. The method is characterized by comprising a cognitive radio 'transmission after listening' frame structure, a cognitive radio transmitter and a cognitive radio receiver. The cognitive radio frame structure is divided into a perception time slot and a transmission time slot. The method has the advantages that the cognitive radio transmitter can capture energy of external signals while perceiving the external electromagnetic signals; the transmitter converts the energy of all the captured external signals into electric energy required by the system and stores the electric energy into a battery when perceiving that an authorized user is idle; due to the increase of the battery capacity, the transmitter can transmit more information data at higher transmitting power, and therefore the communication throughout capacity of the system can be improved.

Description

technical field [0001] The invention relates to the technical field of radio communication, in particular to an energy harvesting cognitive radio communication method based on listening first and transmitting later. Background technique [0002] Based on software radio, cognitive radio is an intelligent wireless communication technology that improves the utilization of spectrum resources. It greatly improves the utilization of limited spectrum resources by using the statutory spectrum allocated by the government to authorized users by choosing an opportunity, but the premise is that cognitive radio cannot cause any interference to the normal communication of authorized users. Therefore, before transmitting data, cognitive radio needs to detect whether there is an authorized user in the channel through spectrum sensing technology. Only when the authorized user is idle, cognitive radio can communicate. The most commonly used spectrum sensing technology in cognitive radio is e...

AI Technical Summary

Problems solved by technology

[0004] The existing cognitive radio communication technology has the following defects: (1) Cognitive radio can only use the spectrum when there is no authorized user, so the time for the system to use the spectrum is very limited and most of the time is idle, which directly leads to The communication throughput of the system is relatively low, which often cannot meet the user's demand for communication quality; (2) The energy of the cognitive radio system is very limited and needs to consume additional energy to perceive the authorized user signal, so the energy used to transmit data will decrease. (3) Cognitive radio lacks the effective use of external electromagnetic energy when performing spectrum sensing on the external electromagnetic environment

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