DVB-T (Digital Video Broadcasting-Terrestrial) spectrum sensing method and system

Abstract

The invention discloses a DVB-T (Digital Video Broadcasting-Terrestrial) spectrum sensing method and a DVB-T spectrum sensing system. A data output end of a radio-frequency receiving module is connected with a data input end of a central control processing module through a digital-to-analog conversion module. A data output end of a radio-frequency transmitting module is connected with the data input end of the central control processing module through a digital-to-analog conversion module. A local oscillator output end of the central control processing module is respectively connected with local oscillator control ends of the radio-frequency receiving module and the radio-frequency transmitting module. Aim at simplifying the system hardware structure, realizing the quick switching of a DVB-T frequency band, guaranteeing the spectrum sensing speed and saving processor resources, by using an FPGA (Field Programmable Gate Array) as a processor for flexibly controlling local oscillator frequency output, the goal of full-band coverage of DVB-T is realized; by windowing acquired signals and by adopting a CORDIC (Coordinated Rotation Digital Computer) algorithm, FFT (Fast Fourier Transform) processing is realized; by adopting an energy detection algorithm based on FFT, the sensing of the DVB-T frequency band is realized.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a terrestrial digital television broadcasting (DVB-T) spectrum sensing method and system. Background technique [0002] With the development of wireless communication services, available spectrum resources are becoming increasingly scarce, and limited spectrum resources have gradually become a bottleneck restricting the development of wireless communication technologies. Therefore, saving spectrum resources and improving spectrum utilization will be an important field for future wireless communication development. However, under the current spectrum authorization allocation system, competition for spectrum resources in certain specific frequency bands is fierce, and unlicensed users cannot occupy unused frequency bands in other licensed frequency bands, resulting in low spectrum utilization. In the case of scarce spectrum resources and low utilization rate, in ...

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Problems solved by technology

However, because the system is difficult to meet the real-time and processing speed requirements of the spectrum sensing system, and the hardware structure is complex, it is difficult to implement and the cost is high, which is not conducive to commercial promotion.

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