Hybrid duplex transmission method in cognitive relay network based on relay selection

Abstract

The invention discloses a hybrid duplex transmission method in a cognitive relay network based on relay selection. The cognitive relay network includes a pair of transmitter and receiver of authorized users and a pair of transmitter and receiver of unauthorized users, and potential cooperative relays made up of a plurality of idle unauthorized users. First, a potential relay maximizing the sum of end-to-end signal-to-noise ratio of authorized users and unauthorized users is selected as an optimal relay according to instantaneous channel state information. In half-duplex transmission, a relay transmission frame is divided into two equal time slots. In full-duplex transmission, a relay transmission frame is not divided into time slots. When the signal-to-noise ratio received by the relay is lower than a threshold, full-duplex transmission is employed. Otherwise, half-duplex transmission is employed. Transmission is switched between a half-duplex transmission mode and a full-duplex transmission mode according to the signal-to-noise ratio received by the relay. The advantage of full duplex in transmission capacity is utilized, and the adverse effect of self-interference on the performance of transmission capacity is weakened. Therefore, the total transmission capacity of the cognitive relay network is increased.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a hybrid duplex transmission method in a cognitive relay network based on relay selection. Background technique [0002] Today's world has entered the information society, and information and communication technology has penetrated into all aspects of people's lives. Among them, the development of wireless communication technology is changing with each passing day, and various new wireless communication systems and services are constantly emerging. This makes the available spectrum resources more and more scarce. Although new frequency bands are constantly being developed and utilized, it is still difficult for the existing available spectrum resources to meet the high-speed, high-reliability communication needs of a large number of users. The increasingly intensified contradiction between the shortage of spectrum resources and the low utilization rate has prompt...

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Problems solved by technology

[0007] For the existing cognitive relay network transmission, only half-duplex and full-duplex transmission methods are considered separately, but the technical problems of half-duplex and full-duplex hybrid transmission are not considered. The purpose of the present invention is to provide a relay-based The hybrid duplex transmission method in the selected cognitive relay network switches between half-duplex transmission and full-duplex transmission according to the signal-to-interference-noise ratio received by the relay, so as to take advantage of the full-duplex transmission capacity and weaken the self- Adverse effect of interference on transmission capacity performance; ultimately achieves the goal of maximizing the overall transmission capacity of relay-assisted cognitive networks

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