A detection method and detection device for a wifi signal
A detection method and signal technology, applied in the field of digital information technology transmission, can solve the problems of low reliability
Active Publication Date: 2022-04-15
ALTO BEAM (CHINA) INC
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[0004] In view of this, the purpose of the embodiments of the present application is to provide a wifi signal detection method and detection device, by converting the signal from the time domain to the frequency domain, and processing the frequency domain signal, so as to overcome the low signal-to-noise ratio The problem of low reliability of autocorrelation detection of time domain signals under certain conditions
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Embodiment approach A
[0167] In one embodiment A, when the first result is determined according to step S210 and the second result is determined according to step S310, whether a wifi signal is detected can be determined in the following manner:
[0168] Exemplarily, for each group of subcarriers, it is judged whether a wifi signal is detected based on the magnitudes of the first result and the second result corresponding to the group of subcarriers.
[0169] Specifically, for the current group of subcarriers, the magnitude of the second result corresponding to the group of subcarriers is compared with the corresponding first result to obtain a ratio between the magnitude of the second result and the first result. If as i (the i-th group of subcarriers) increases, if the ratios of a predetermined number of consecutive groups are greater than a preset threshold value, then it is considered that a wifi signal is detected.
[0170] For example, the following formula can be used to judge whether a wifi...
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The present application provides a wifi signal detection method and detection device, wherein the method includes: acquiring at least one group of subcarriers in the frequency domain of the target signal; for each group of subcarriers, based on the The data power of all effective subcarriers and the data power of all effective subcarriers in the previous group of subcarriers adjacent to the group of subcarriers determine the first result; for each group of subcarriers, based on the The data carried by all effective subcarriers and the data carried by all effective subcarriers in the previous group of subcarriers adjacent to the group of subcarriers are used to determine the second result; for each group of subcarriers, based on the corresponding The first result and the corresponding second result determine whether a wifi signal is detected. According to the detection method and detection device, frequency domain signals can be processed, thereby improving the reliability of autocorrelation detection of signals under the condition of low signal-to-noise ratio.
Description
technical field [0001] The present application relates to the field of digital information technology transmission, in particular, to a method and device for detecting wifi signals. Background technique [0002] Currently, higher performance LDPC (Low Density Parity Check Code) channel coding is defined in the wireless network communication standards 802.11n, 802.11ac and 802.11ax, especially DCM modulation (dual carrier modulation) is defined in 802.11ax . Therefore, these WIFI (Wireless Fidelity) systems can theoretically work normally when the signal-to-noise ratio approaches 0 or lower. This requires the receiver to be able to detect and receive the signal correctly under the condition of very low signal-to-noise ratio or less received signal power. In the process of realizing the correct detection and reception of the signal, the signal will be firstly detected by autocorrelation. [0003] Usually, in the prior art, the autocorrelation detection of the signal under t...
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IPC IPC(8): H04W24/04H04W84/12
CPCH04W24/04H04W84/12Y02D30/70
Inventor 王军伟王晓辉
Owner ALTO BEAM (CHINA) INC