Method for realizing frequency spectrum sensing by using multi-phase filter

Abstract

The invention discloses a method for realizing frequency spectrum sensing by using a multi-phase filter. The method is implemented on a field programmable gate array (FPGA) by using a Xilinx / System Generator development tool. According to the method, a multi-phase filtration part and an energy detection part are adopted, wherein the multi-phase filtration part comprises a data type conversion unit, a delay unit, a filter group coefficient address generation unit, a filter group coefficient storage unit, a filter group coefficient analysis unit, a multiplication unit, an addition unit, a clock synchronization unit and a fast Fourier transformation (FFT) unit; the energy detection part comprises the addition unit, the multiplication unit and a mean value acquiring unit; a wireless signal is received and subjected to frequency mixing by an antenna and then converted into I and Q channels of baseband signals; the two channels of baseband signals are sampled by two analog-to-digital converters (ADC) and then converted into digital baseband signals; the digital baseband signals are input into a multi-phase filter group and then filtered under the control of an enabling signal; and the filtered signals are input into the energy detection part and subjected to energy detection, so that the frequency spectrum sensing is realized.

Description

technical field [0001] The invention relates to a method for realizing frequency spectrum sensing by using a polyphase filter bank, and belongs to the technical field of digital signal processing and analysis. Background technique [0002] In the field of electromagnetic environment detection, the receiving system is required to process multiple signals in different frequency bands at the same time, that is, to perform broadband signal reception and processing. Channelization processing based on filter bank is an effective method for receiving and processing broadband signals. At the same time, the high-efficiency filtering structure of the polyphase filter provides a guarantee for the real-time performance of multi-channel reception. The invention patent with the patent number 03109015 belongs to the related invention in this field. In engineering practice, the received signal data is often not continuous and effective; when receiving and filtering signals, a faster proce...

AI Technical Summary

Problems solved by technology

The above problems bring certain difficulties in the implementation of spectrum sensing

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