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Frequency spectrum sensing method based on signal frequency spectrum envelope

A signal spectrum and spectrum sensing technology, which is applied in transmission monitoring, electrical components, transmission systems, etc., can solve the problems of low time-domain correlation and poor performance of spectrum sensing when there is no correlation

Inactive Publication Date: 2012-02-29
NINGBO UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a signal spectrum envelope-based signal detection system with good spectrum sensing performance, which can effectively overcome the disadvantage of low time-domain correlation or poor spectrum sensing performance between multi-antenna received signals. Spectrum sensing method

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  • Frequency spectrum sensing method based on signal frequency spectrum envelope
  • Frequency spectrum sensing method based on signal frequency spectrum envelope
  • Frequency spectrum sensing method based on signal frequency spectrum envelope

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] A spectrum sensing method based on the signal spectrum envelope proposed by the present invention, its flow chart is as follows figure 1 As shown, it mainly includes the following steps:

[0017] ① Assume that the cognitive radio system uses two receiving antennas to receive time-continuous radio frequency signals, and express the time-domain continuous radio frequency signals received by the two receiving antennas as a function of time t. The continuous radio frequency signal in time domain is denoted as x 1 (t), the time-domain continuous radio frequency signal received by the second receiving antenna is denoted as x 2 (t).

[0018] ② Respectively for the time-domain continuous radio frequency signal x received by the first receiving antenna 1 (t) and the time-domain continuous radio frequency signal x received by the second recei...

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Abstract

The invention discloses a frequency spectrum sensing method based on signal frequency spectrum envelope. The frequency spectrum sensing method comprises the following steps of: firstly, receiving a time domain continuous radio frequency signal by using two receiving antennae; secondly, carrying out down conversion and time domain sampling processing on the time domain continuous radio frequency signal to obtain a time domain discrete base band signal; carrying out discrete Fourier transform on the time domain discrete base band signal to obtain a signal frequency spectrum; calculating a signal frequency spectrum enveloped crosscorrelation coefficient; and finally, judging whether a frequency band is occupied by other wireless communication services by comparing the signal frequency spectrum enveloped crosscorrelation coefficient with a decision threshold and realizing the frequency spectrum cognition. According to the frequency spectrum sensing method disclosed by the invention, the defects that the frequency spectrum cognition is failed when the time-domain correlation among a plurality of antenna receiving signals is lower or uncorrelated in a traditional covariance matrix detection method and a characteristic value detection method are overcome.

Description

technical field [0001] The invention relates to a spectrum sensing technology in a cognitive radio system, in particular to a spectrum sensing method based on a signal spectrum envelope. Background technique [0002] With the rapid growth of wireless communication services, people's demand for spectrum resources continues to increase. However, the available physical spectrum resources that can be used for wireless communication services are limited, and the existing fixed spectrum resource allocation strategy makes the utilization rate of spectrum resources low, which results in a serious shortage of spectrum resources. The cognitive radio (Cognitive Radio, CR) technology can effectively improve the utilization rate of spectrum resources, thereby alleviating the problem of lack of spectrum resources. Spectrum sensing is an important part of cognitive radio technology. It can effectively prevent wireless communication services using cognitive radio technology from interferin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 金明李有明
Owner NINGBO UNIV
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