Short-wave spectrum sensing method and system

Abstract

The invention discloses a short-wave spectrum sensing method and a short-wave spectrum sensing system. An RF (radio-frequency) front-end unit dynamically adjusts the center frequency of a narrow-band electric tuning filter for multi-band short-waves at an RF analog front-end, and the Q value of a tuned loop is improved through an effective impedance matching network, thereby controlling the bandwidth of a filter to be fixed at a communication channel bandwidth or slightly greater than the communication channel bandwidth; after carrying out sampling on a signal, an analog-to-digital conversion module converts an analog short-wave signal in a pass band into a digital short-wave signal, and a digital signal processing unit realizes the sensing on the power spectrum of a received signal by using an energy detection algorithm. The method and system disclosed by the invention have the characteristics that the frequency band covering of short-waves is comprehensive, no image interference is introduced, and the method and the system are easy to implement.

Description

technical field [0001] The invention relates to the field of shortwave communication, in particular to a shortwave spectrum sensing method and system. Background technique [0002] In modern short-wave communication, the lack of spectrum resources and the low efficiency of spectrum management have increasingly become the technical bottleneck of short-wave communication, which greatly affects the efficiency of communication. Implementing cognitive radio technology in the shortwave frequency band is an effective means to solve the current shortage of shortwave spectrum resources. [0003] Cognitive radio technology is developed on the basis of software radio platform. The central idea of ​​the software radio platform is to push the analog-to-digital conversion function module as close as possible to the antenna receiving end, and the subsequent digital signal processing is all realized by digital software, so as to obtain the greatest design flexibility. However, in the actu...

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Problems solved by technology

In the above method, in the RF front-end unit, although the frequency of the received signal is effectively reduced, the reference of the mixer will inevitably introduce image interference, which has the greatest impact on the communication system and is one of the most difficult to eliminate; In the analog-to-digital conversion unit, although the requirements for ADC performance are reduced, the band-pass sampling makes the quantization noise spectrum and signal spectrum evenly distributed, and it is difficult to perform noise reduction processing; in the digital signal processing unit, complex frequency conversion Processing, occupying processor resources, naturally increases the requirements for the processor

[0004] In addition, since the existing cognitive radio system platform is mainly designed for signals above 2GHz, the processing of analog down-conversion and digital down-conversion of the existing cognitive radio system platform is not suitable for relatively low-frequency short-wave (1.5M ~ 30MHz ) signal becomes redundant, and greatly affects the performance and flexibility of the shortwave cognitive radio system

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