A real-time detection method and device of a target OFDM signal
A real-time detection and target technology, which is applied in the field of OFDM signal processing, can solve problems such as inaccurate detection results, high requirements for carrier synchronization, and difficult threshold setting, achieving the effect of not being affected by carrier synchronization and improving reliability
Active Publication Date: 2020-10-13
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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[0004] The purpose of the present invention is to provide a real-time detection method of a target OFDM signal to solve the problems of inaccurate detection results caused by difficult threshold setting and high carrier synchronization requirements in the current OFDM signal detection process; at the same time, the present invention also provides a target Real-time detection device for OFDM signal
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[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0034] The present invention first collects the signal data to be processed, and converts it into a complex signal matched with the target OFDM symbol rate; then processes the complex signal point by point, and performs M-point sliding autocorrelation on the complex signal interval N points according to the sample points, Among them, M is the number of cyclic prefix samples of the target OFDM signal, N is the number of samples of the useful signal, and N is a power of 2; and calculate the M-point energy of the complex signal and the M-point energy of the complex signal at an interval of N points, and combine the two The result of multiplying energy values is used as the adaptive threshold value; finally, the peak point is judged according to the relationship between the modulus value of the sliding autocorrelation and the adaptive threshold v...
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The invention relates to a real-time detection method and device for a target OFDM signal, belonging to the technical field of OFDM signal processing. The method of the invention includes the following steps: according to the characteristic that a cyclic prefix in an OFDM signal is a copy of an ending part of a useful signal, performing M point sliding autocorrelation on a signal to be processed at the interval of N points to ensure that an obtained autocorrelation function is not affected by the carrier frequency deviation; selecting the M point energy of a complex signal and the M point energy of the complex signal at the interval of N points as a threshold, wherein the threshold can be used for tracking the change of the signal energy; and detecting the target OFDM signal according to arelationship between a modulus value of the sliding autocorrelation and an adaptive threshold. According to the scheme of the invention, the problem of detecting the target OFDM signal in real time under the condition of frequency deviation can be solved, the scheme has the adaptive threshold and cannot be affected by the carrier frequency deviation, and the reliability of the real-time detectionof the OFDM signal can be improved.
Description
technical field [0001] The invention relates to a real-time detection method and device of a target OFDM signal, belonging to the technical field of OFDM signal processing. Background technique [0002] The purpose of signal detection is to judge the existence of the target signal and obtain the time and frequency position information of the target signal, which is the basis of subsequent signal processing. How to determine whether a useful target signal exists from an observation signal containing noise is an important topic in the field of signal processing. [0003] The most commonly used method for blind detection of burst signals is the short-term energy method. This method distinguishes signal and noise by calculating the energy value within a period of time. It has the advantages of small calculation and easy implementation, but this method is affected by noise. It is relatively large, and the threshold setting is more difficult; for OFDM signal detection, it is also...
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IPC IPC(8): H04L27/26
CPCH04L27/2647
Inventor 吴迪訾琳溁胡涛蒋腾
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU