Receiver system and receiving method with cognitive function

Abstract

The invention discloses a receiver system and receiving method with the cognitive function. A radio frequency front end module is connected with a digital circuit module through an analog-digital conversion module. A radio frequency preselecting filter with the tuned bandwidth and under digital control is introduced to the radio frequency front end so that mirror image and harmonic interference can be effectively avoided and control can be convenient. Meanwhile, spectrum sensing and cognitive user data receiving are combined into a whole, a feature detection algorithm based on cyclic prefix correlation is adopted, spectrum sensing and data receiving can be conducted at the same time, intervention of signals of a main user can be found in time, a silent period is avoided, and communication efficiency is improved. In addition, idle channels can be provided for cognitive users and the current idle channels are continuously monitored. Under the condition that a local oscillator is not changed, spectrum sensing is conducted on other channels in an XMHZ and spare channels are provided. When the main user occupies an authorized frequency band again, the idle channels can be dynamically and intelligently switched in real time.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a receiver system and method with cognitive functions. Background technique [0002] In modern communication, the scarcity of spectrum resources and the low efficiency of spectrum management have become the bottleneck restricting the development of wireless communication technology. Cognitive radio technology is an effective means to solve current problems. At the same time, terrestrial digital television (DVB-T), as an important part of people's leisure and entertainment, has a lot of idle spectrum in time, frequency and space. With the help of cognitive radio technology, cognitive users can communicate data in the unlicensed digital TV spectrum. [0003] To utilize the vacant spectrum of terrestrial digital TV, it is first necessary to determine the vacant spectrum of terrestrial digital TV through spectrum sensing, and then allocate the perceived vacant spe...

AI Technical Summary

Problems solved by technology

But in order to ensure the reliability of spectrum sensing, the sensing process needs to use the silent period

During the silent period, cognitive users must interrupt their own transmission, resulting in discontinuous data transmission and affecting communication efficiency

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