CN115801142A - Multi-bandwidth mode wireless signal detection method based on dual-mode communication standard - Google Patents
Multi-bandwidth mode wireless signal detection method based on dual-mode communication standard Download PDFInfo
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Abstract
The invention discloses a method for detecting a multi-bandwidth mode wireless signal based on a dual-mode communication standard, which comprises the following specific steps: 101 ) a signal preprocessing step, 102) a signal processing step, 103) a judgment processing step; the invention directly distinguishes the bandwidth mode of the current wireless signal by utilizing the characteristics of short leading signals under three bandwidth modes of HRF in a dual-mode communication standard and processing such as unified sampling rate, multi-length correlation, signal arrival detection and the like.
Description
Technical Field
The invention relates to the field of communication transmission, in particular to a multi-bandwidth mode wireless signal detection method based on a dual-mode communication standard.
Background
After the national power grid continuously applies the HPLC broadband carrier product in a large range for several years, the dual-mode communication standard of HPLC + HRF is provided based on the practical application effect. Wherein the working frequency band of the HRF is 470MHz-510MHz. The standard defines three bandwidth modes for HRF, respectively: 1MHz, 500kHz, 200kHz, the intercommunication can not be realized under different bandwidth modes, and 200, 79, 39 working channels are respectively divided into the whole working frequency range under three modes.
The presence of three modes of HRF results in inefficient attempts at bandwidth mode by bandwidth mode while synchronizing communications through the wireless frequency sweep. Therefore, a method for processing signals is urgently needed to realize automatic detection and identification of wireless signals in three bandwidth modes, so that the efficiency of wireless frequency sweeping is obviously improved, and the time consumed for accessing the network of equipment is reduced.
Disclosure of Invention
The invention overcomes the defects of the prior art, and directly distinguishes the bandwidth mode of the current wireless signal by utilizing the characteristics of short leading signals under three bandwidth modes of HRF in a dual-mode communication standard and processing such as uniform sampling rate, multi-length correlation, signal arrival detection and the like.
The technical scheme of the invention is as follows:
a method for detecting a multi-bandwidth mode wireless signal based on a dual-mode communication standard comprises the following specific steps:
101 Signal preprocessing step: acquiring a multi-bandwidth mode wireless signal of a dual-mode communication standard, and adjusting the sampling rate of a digital signal, namely outputting a sampled digital signal by taking the symbol rate of a bandwidth mode 1 as a sampling rate reference, wherein the symbol rates of a bandwidth mode 3, a bandwidth mode 2 and a bandwidth mode 1 are respectively f s /4、f s /2、f s ；
102 Signal processing step: the method comprises the steps that by utilizing the characteristic that the three bandwidth mode short preamble signal repetition periods of HRF wireless signals in a dual-mode communication standard are different, the correlation lengths of a bandwidth mode 3, a bandwidth mode 2 and a bandwidth mode 1 are 16, 32 and 64 respectively, and delay autocorrelation and energy calculation are carried out on sampled input digital sampling signals;
calculating normalized delay autocorrelation through the delay autocorrelation and the energy value to obtain curves of each correlation length, respectively recording the curves as Curve16, curve32 and Curve64, and taking the three curves as judgment basis of signal arrival;
103 ) a judgment processing step: respectively carrying out signal arrival platform search on 3 normalized delay autocorrelation curves, wherein the mode judgment standard based on the search result is as follows: the signal arrival platform is searched by the Curve16, the Curve32 and the Curve64, and the bandwidth mode is corresponding to the bandwidth mode 1; both the Curve32 and the Curve64 search a signal arrival platform, and the signal arrival platform corresponds to a bandwidth mode 2; only Curve64 searches for a signal to reach the platform, corresponding to Bandwidth mode 3.
Further, the time delay autocorrelation and the energy value calculation normalization time delay autocorrelation in the step 102) of signal processing are both realized in a sliding window mode, the window width is the repetition period of the short preamble signal, and the window sliding step is 1;
the data of the window display sampling points move in a sliding window in a first-in first-out mode, and each time the window slides and steps once, a group of time delay autocorrelation and sampling point energy values are output, so that one point of a normalized time delay autocorrelation curve is obtained.
Further, for data of sampling points input by a window, normalized delay autocorrelation of three correlation lengths needs to be acquired simultaneously;
the maximum correlation length is designed for the correlation length, so that three correlation length curve points are synchronously output, the width of a window, namely the correlation length, is 64, and the remaining 2 correlation length curve points of 32 and 16 are synchronously output.
Furthermore, when the collected signal appears, the normalized delay autocorrelation value gradually increases along with the movement of the sliding window, and when the sampling points in the correlation operation sliding window are all effective signals, the normalized delay autocorrelation value is constant and is fixed to 1 under an ideal condition.
Furthermore, by smoothing the normalized delay autocorrelation curve, the length of the smoothing window can be adjusted, and the larger the length is, the better the noise resisting effect is.
Further, performing peak-based search on each smoothed normalized delay autocorrelation curve, and performing signal arrival search of an absolute value threshold on each smoothed normalized delay autocorrelation curve, wherein when the two conditions are met simultaneously, the signal arrival is detected;
and stopping searching itself after detecting the arrival of the signal on any normalized delay autocorrelation curve, and waiting for the end of continuous calculation of other curves.
The invention has the advantages that:
according to the scheme, the signals are sampled at a uniform sampling frequency by utilizing the multiple relation of wireless multi-mode short preamble symbol rates defined by an HPLC (high performance liquid chromatography) and HRF (high resolution factor) dual-mode standard, so that the signals in different bandwidth modes have different signal repetition periods, a correlator is used for calculating a normalized delay correlation curve according to different correlation lengths, and finally the bandwidth mode of the current signal is directly judged. The scheme can judge three bandwidth modes at one time, and greatly improves the working efficiency and greatly reduces the frequency scanning time compared with the mode of scanning the bandwidth modes one by one.
The scheme optimizes the use of the correlator in the design to reduce the resource occupation; the delay correlation curve is smoothed to better resist noise.
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FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a diagram of a short preamble sequence in three bandwidth modes of HRF according to the present invention;
FIG. 3 is a graph illustrating normalized delayed autocorrelation curves under noise-free conditions in accordance with the present invention;
FIG. 4 is a diagram illustrating a normalized delayed autocorrelation curve when the normalized SNR is 0dB according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description. It should be understood that the embodiments described herein are only for illustrating the present invention and are not to be construed as limiting the present invention, and the parts of the present invention which are not described in detail can be implemented by the conventional technical means.
As shown in fig. 1 to 4, the method for detecting a multi-bandwidth mode wireless signal based on a dual-mode communication standard specifically includes the following steps:
101 Signal preprocessing step: acquiring a multi-bandwidth mode wireless signal of a dual-mode communication standard, and adjusting the sampling rate of a digital signal, namely outputting a sampling digital signal by taking the symbol rate of a bandwidth mode 1 as a sampling rate reference, and then carrying out the band-passThe symbol rates of the wide mode 3, the bandwidth mode 2 and the bandwidth mode 1 are f s /4、f s /2、f s 。
102 Signal processing step: by utilizing the characteristic that the three bandwidth modes of the HRF wireless signal in the dual-mode communication standard have different short preamble signal repetition periods, the correlation lengths of the bandwidth mode 3, the bandwidth mode 2 and the bandwidth mode 1 are respectively 16, 32 and 64, and the time delay autocorrelation and the energy value calculation are carried out on the sampling input digital sampling signal.
That is, the number of fft points of HRF in different bandwidth modes in the dual-mode communication standard, and the number of OFDM subcarriers is 128, 64, and 32, respectively. The preambles of the three bandwidth modes are time domain repeated sequences generated in a frequency domain uniform interpolation mode, and the repeated times are respectively 8, 4 and 2. Therefore, the repetition periods of the time domain short preamble sequences are the same and are 16 sampling points under each mode, and the time domain repetition times are different. Specifically, as shown in fig. 2, a time domain diagram of a short preamble sequence in three bandwidth modes is given, so that it can be known from the standard content that although bandwidths of the three bandwidth modes are not in an equal ratio relationship, digital symbol rates are in an equal ratio relationship, and a ratio relationship is 4:2:1, and therefore the symbol rate of bandwidth mode 3, bandwidth mode 2 and bandwidth mode 1 is set as f respectively by taking the symbol rate of bandwidth mode 1 as the sampling rate reference and outputting the sampled digital signal s /4、f s /2、f s 。
Therefore, a buffer with the length of 128 is utilized and designed as a sampling point sliding window with the step of 1, then normalized delay autocorrelation is calculated through delay autocorrelation and energy values, curves with the correlation lengths of 16, 32 and 64 are obtained and are respectively marked as Curve16, curve32 and Curve64, and the three curves are used as judgment bases of signal arrival. Because for the data of the sampling points input by the window, normalized delay autocorrelation of three correlation lengths needs to be acquired simultaneously.
For convenience of processing, the correlation length adopts a window for designing the maximum correlation length so as to synchronously output three kinds of correlation length curve points. The width of the window, i.e. the correlation length, is 64, and the curve points of the remaining 2 correlation lengths 32 and 16 can be synchronously output, and the buffer with the length of 128 is sufficient for reasonable realization. The time delay autocorrelation and the energy value calculation normalization time delay autocorrelation are realized in a sliding window mode, and the window sliding step is 1.
The data of the window display sampling points move in a sliding window in a first-in first-out mode, and each time the window slides and steps once, a group of time delay autocorrelation and sampling point energy values are output, so that one point of a normalized time delay autocorrelation curve is obtained. When the collected signal appears, the normalized delay autocorrelation value gradually increases along with the movement of the sliding window, and when the sampling points in the correlation operation sliding window are all signals, the normalized delay autocorrelation value is constant and is fixed to 1 under an ideal condition.
Specifically, each incoming sampling point x is subjected to one time delay autocorrelation calculation and energy calculation, and the formula is as follows:
wherein A is corr (i) And P ower (i) Respectively time delay autocorrelation and energy value of a time point i, abs () is a function for solving an absolute value, and CLEn is correlation length, namely window width;
synchronous calculable normalized delay autocorrelation value NA corr (i)
NA corr (i)＝A corr (i)/P ower (i) Formula (3)
From the above, since it is necessary to calculate normalized delay autocorrelation curves of three correlation lengths, i.e., correlation lengths of 16, 32, and 64, respectively; the above formula shows that the calculation of correlation lengths 16 and 32 are part of the correlation length 64 calculation, so that 3 kinds of correlation length data can be obtained simultaneously by one correlation length 64 calculation.
For dividing the results of different correlation lengths into regionsMin, is denoted as NA corr (i) (l), l =1,2,3, corresponding to correlation lengths 16, 32, 64, i as time points. Designing three first-in first-out caches with the length of M, respectively smoothing normalized delay autocorrelation curves with three correlation lengths, and performing operation once when one point is input; the length M is selected to be any natural number larger than 2, and in consideration of realizing resources and smoothing effects, the length M is selected to be 16 reasonably; the processed data is recorded as SNA corr (i) (l), l =1,2,3,i is the time point.
The length M of a smooth window can be adjusted and set by carrying out smoothing treatment on the normalized delay autocorrelation curve, and the larger the length is, the better the noise resisting effect is. The value here is only an example, and the setting should be adjusted actually through various channel simulation situations.
103 ) a judgment processing step: and respectively carrying out signal arrival platform search on the three normalized delay autocorrelation curves, wherein the mode judgment standard based on the search result is as follows: the signal arrival platform is searched by the Curve16, the Curve32 and the Curve64, and the bandwidth mode is corresponding to the bandwidth mode 1; both the Curve32 and the Curve64 search a signal arrival platform, and the signal arrival platform corresponds to a bandwidth mode 2; only Curve64 searches for a signal to reach the platform, corresponding to Bandwidth mode 3.
Specifically, a peak-based search is performed on each smoothed normalized delay autocorrelation curve, and a signal arrival search of an absolute threshold is performed on each smoothed normalized delay autocorrelation curve, and when both conditions are satisfied, it indicates that a signal arrival is detected.
After the peak value is detected, whether the current peak value meets the threshold requirement needs to be judged; considering the influence of the normalized delay autocorrelation value under the noise condition, the absolute threshold is set to 0.6, and the setting should be actually adjusted by various channel simulation results.
If the peak condition and the absolute threshold condition are both met, setting the corresponding detection result as 1, and recording the result as J (l), wherein l =1,2,3; if the absolute threshold condition is not met, the search for peaks continues. And stopping self search after the arrival of the detected signal on any normalized delay autocorrelation curve, waiting for the end of continuous calculation of other curves, generally lasting for W sampling points, wherein W can be set according to the actual situation, and the value is recommended to be 2 times of the maximum correlation length. The final mode decision condition is then the following equation:
the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention, and these modifications and decorations should also be regarded as being within the scope of the present invention.
Claims (6)
1. A method for detecting a multi-bandwidth mode wireless signal based on a dual-mode communication standard is characterized in that: the method comprises the following specific steps:
101 Signal preprocessing step: acquiring a multi-bandwidth mode wireless signal of a dual-mode communication standard, and adjusting the sampling rate of a digital signal, namely outputting a sampled digital signal by taking the symbol rate of a bandwidth mode 1 as a sampling rate reference, wherein the symbol rates of a bandwidth mode 3, a bandwidth mode 2 and a bandwidth mode 1 are respectively f s /4、f s /2、f s ；
102 Signal processing step): the method comprises the steps that by utilizing the characteristic that three bandwidth mode short preamble signal repetition periods of HRF wireless signals in a dual-mode communication standard are different, the correlation lengths of a bandwidth mode 3, a bandwidth mode 2 and a bandwidth mode 1 are respectively 16, 32 and 64, and delay autocorrelation and energy calculation are carried out on sampling input digital sampling signals;
calculating normalized delay autocorrelation through the delay autocorrelation and the energy value to obtain curves of each correlation length, respectively recording the curves as Curve16, curve32 and Curve64, and taking the three curves as judgment basis of signal arrival;
103 ) a judgment processing step: respectively carrying out signal arrival platform search on 3 normalized delay autocorrelation curves, wherein the mode judgment standard based on the search result is as follows: the signal arrival platform is searched by the Curve16, the Curve32 and the Curve64, and the bandwidth mode is corresponding to the bandwidth mode 1; both the Curve32 and the Curve64 search a signal arrival platform, and the signal arrival platform corresponds to a bandwidth mode 2; only Curve64 searches for a signal to reach the plateau, corresponding to bandwidth mode 3.
2. The method of claim 1, wherein the method comprises: step 102) in the signal processing step, the time delay autocorrelation and the energy value calculation normalization time delay autocorrelation are both realized in a sliding window mode, the window width is the repetition period of the short preamble signal, and the window sliding step is 1;
the data of the window display sampling points move in a sliding window in a first-in first-out mode, and each time the window slides and steps once, a group of time delay autocorrelation and sampling point energy values are output, so that one point of a normalized time delay autocorrelation curve is obtained.
3. The method of claim 2, wherein the method comprises: for data of sampling points input by a window, normalized delay autocorrelation of three correlation lengths needs to be acquired simultaneously;
the maximum correlation length is designed for the correlation length, so that three kinds of correlation length curve points are synchronously output, the width of a window, namely the correlation length, is 64, and the other 2 kinds of curve points with the correlation lengths of 32 and 16 are synchronously output.
4. The method of claim 1, wherein the method comprises: when the collected signal appears, the normalized delay autocorrelation value gradually increases along with the movement of the sliding window, and when the sampling points in the correlation operation sliding window are all effective signals, the normalized delay autocorrelation value is constant and is fixed to 1 under an ideal condition.
5. The method of claim 1, wherein the method comprises: by smoothing the normalized delay autocorrelation curve, the length of a smoothing window can be adjusted, and the larger the length is, the better the noise resisting effect is.
6. The method of claim 5, wherein the method comprises: carrying out peak-based search on each smoothed normalized delay autocorrelation curve, and carrying out signal arrival search of an absolute value threshold on each smoothed normalized delay autocorrelation curve, wherein when the two conditions are met simultaneously, the signal arrival is detected;
and stopping searching itself after detecting the arrival of the signal on any normalized delay autocorrelation curve, and waiting for the end of continuous calculation of other curves.
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