Anti-interference frequency spectrum access method based on full duplex OFDM cooperation

Abstract

Provided is an anti-interference frequency spectrum access method based on full duplex OFDM cooperation. According to the method, if the speed during direct transmission of an authorized user is lower than the target speed, cooperation request signals will be sent to surrounding cognitive users for seeking the cooperation of the cognitive users. The cognitive user which can help the authorized user to obtain the maximum speed can be found out from all the cognitive users receiving the cooperation request signals, if the user can help the authorized user to achieve the target speed, the user will be allowed to have access to the frequency spectrum of the authorized user in a full duplex OFDM cooperation mode, and otherwise, the authorized user continues to send own information through direct transmission. After the cognitive user has access to the frequency spectrum of the authorized user, the cognitive user helps the authorized user to forward the information of the authorized user by using one part of subcarriers and power in a second time slot, and sends own information by using the other part of subcarriers and power in a first time slot and a second time slot. The anti-interference frequency spectrum access method based on the full duplex OFDM cooperation effectively solves the problem of mutual interference between the authorized user and the cognitive users, and improves the throughput of a cognitive system.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio communication in the field of wireless communication, in particular to a frequency spectrum access method. Background technique [0002] Since entering the 21st century, communication technology has been extensively developed, especially the rapid development of wireless communication technology is the most prominent. With the rapid development of wireless communication technology, the problem of scarcity of spectrum resources is becoming more and more serious. According to the research report of the Spectrum Policy Task Force of the Federal Communications Commission of the United States, the utilization rate of the existing licensed spectrum is only 15% to 85%. The spectrum allocated to licensed users is not fully utilized in time and space, which shows the lack of spectrum resources. Much of this is due to unreasonable radio spectrum management. Since most of the spectrum has been allo...

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Problems solved by technology

[0004] In order to overcome the problem of mutual interference between licensed users and cognitive users in existing coexistence spectrum access methods, and the problem of throughput loss caused by half-duplex mode, the present invention provides a method that effectively eliminates licensed users and cognitive users. Anti-interference spectrum access method based on full-duplex OFDM cooperation for mutual interference problem and throughput loss problem between users

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