Detection method and system of straight receiver

Abstract

The invention discloses a detection method of a straight receiver, comprising the steps of: after a communication link is established between a main receiver and a main transmitter, transmitting signals to a peripheral subordinate user by the main receiver through a signal transmitter arranged on the main receiver per se so as to inform the main receiver of a used authorization receiving frequency; and determining a frequency spectrum cavity by a slave transmitter receiving the signal according to the signal. The invention also relates to a detection system of the straight receiver, comprising the main receiver provided with the signal transmitter, and the slave transmitter. In the invention, an information interaction mode between a main user and a subordinate user is adopted and the main receiver is used for informing the subordinate user of the authorization receiving frequency information so that the subordinate user can determine the frequency spectrum cavity depending on the main receiver, and the method can effectively solve the hidden station problems and other problems of interference on the main receiver due to inaccurate subordinate user frequency spectrum detection.

Description

technical field [0001] The invention relates to spectrum detection technology in cognitive radio, in particular to a direct receiver detection method and system. Background technique [0002] At present, the interference in cognitive radio can be divided into two types, one is the direct interference caused by using the licensed frequency band of the primary user (Primary User) from the secondary user (Secondary User); the other is due to the interference detected from the user spectrum Inaccurate, causing secondary users to use frequency bands that should not be used, thereby causing interference to primary users. A typical scenario of such interference is the hidden station problem (Hidden Terminal Problem). A brief introduction to the hidden station problem is given below. [0003] figure 1 Shown is a typical covert station problem scenario, which is also a class of intractable interference problems in cognitive radio systems. Only relying on the traditional transmitte...

AI Technical Summary

Problems solved by technology

[0015] However, this method cannot guarantee strong protection for the primary user system, especially the primary receiver that receives the low signal strength of the primary transmitter is easily interfered by secondary users

The biggest difficulty in implementing this kind of receiver detection lies in how to effectively measure the interference temperature

Since the main receiver is usually passive, the user cannot know the specific location of the main receiver, so it is impossible to effectively estimate how much interference will be caused to the adjacent main receiver.

Moreover, effective interference temperature measurement requires the slave user to measure the interference it causes to all possible primary receivers, and there is currently no practical way to solve this problem

[0016] To sum up, the existing transmitter detection cannot completely solve the interference problems such as hidden stations, while the receiver detection scheme is still in the research stage, and there is no mature feasible solution

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