CN114401176B - Signal arrival detection method and device, electronic equipment and storage medium - Google Patents

Signal arrival detection method and device, electronic equipment and storage medium Download PDF

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CN114401176B
CN114401176B CN202111665740.3A CN202111665740A CN114401176B CN 114401176 B CN114401176 B CN 114401176B CN 202111665740 A CN202111665740 A CN 202111665740A CN 114401176 B CN114401176 B CN 114401176B
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CN114401176A (en
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李晓明
郑波浪
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Beijing Shengzhe Science & Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The application discloses a signal arrival detection method, a device, an electronic device and a storage medium, comprising: determining a first delay differential phase and an amplitude value of a signal to be detected and a second delay differential phase of the CPM signal, and determining standard values of various parameters of the CPM signal and current values of various parameters of the signal to be detected according to the first delay differential phase, the amplitude value and the second delay differential phase; detecting signals to be detected in a current access window according to standard values and corresponding current values of various parameters to obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result; and determining a comprehensive detection value according to the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results of the continuous multiple access windows, and determining that the signal of the signal to be detected reaches the detection result according to the comprehensive detection value. The technical scheme can realize low-complexity signal arrival detection and can meet the requirement of a receiver on low power.

Description

Signal arrival detection method and device, electronic equipment and storage medium
Technical Field
The embodiment of the application relates to the technical field of information communication, in particular to a signal arrival detection method, a signal arrival detection device, electronic equipment and a storage medium.
Background
The continuous phase modulation (Continuous Phase Modulation, CPM) signal has the characteristics of constant envelope, fast power spectrum sidelobe attenuation, flexible and various modulation formats and the like, and is widely applied to low-power wireless transmission networks such as Bluetooth, low-power wide area networks and the like.
According to the requirements of the IEEE 802.15.4 standard, the CPM receiver needs to support functions such as channel idle detection or listening before transmission. For this reason, the CPM receiver physical layer needs to have the capability to detect signal arrival. Conventional signal arrival detection is typically implemented using correlators, but correlation operations involve multiplication and accumulation, have high computational complexity, and are not suitable for low power receivers.
Disclosure of Invention
The embodiment of the application provides a signal arrival detection method, a device, electronic equipment and a storage medium, and the signal arrival detection with low complexity can meet the requirement of a receiver on low power.
In a first aspect, an embodiment of the present application provides a signal arrival detection method, where the method includes:
Determining a first delay differential phase and an amplitude value of a signal to be detected, and determining a second delay differential phase of a continuous phase modulation CPM signal;
determining standard values of various parameters of the CPM signal and current values of the various parameters of the signal to be detected in a current access window according to the first time delay differential phase, the amplitude value and the second time delay differential phase;
respectively carrying out signal detection on the signal to be detected in the current access window according to the standard values and the corresponding current values of the various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result;
and determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result of a plurality of continuous access windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value, wherein the current access window is included in the plurality of continuous access windows.
In a second aspect, embodiments of the present application provide a signal arrival detection apparatus, including:
the signal determining module is used for determining a first time delay differential phase and an amplitude value of the signal to be detected and determining a second time delay differential phase of the continuous phase modulation CPM signal;
The parameter determining module is used for determining standard values of various parameters of the CPM signal and current values of the various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase;
the parameter detection module is used for respectively carrying out signal detection on the signal to be detected in the current access window according to the standard values and the corresponding current values of the various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result;
the signal arrival detection module is used for determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result of a plurality of continuous sampling windows, and determining the signal arrival detection result of the signal to be detected according to the comprehensive detection value, wherein the current sampling window is included in the plurality of continuous sampling windows.
In a third aspect, an embodiment of the present application provides an electronic device, including:
one or more processors;
a storage means for storing one or more programs;
The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the signal arrival detection method described in any of the embodiments of the present application.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a signal arrival detection method according to any embodiment of the present application.
The embodiment of the application provides a signal arrival detection method, a device, electronic equipment and a storage medium, wherein the method comprises the following steps: determining a first delay differential phase and an amplitude value of a signal to be detected, and determining a second delay differential phase of a continuous phase modulation CPM signal; determining standard values of various parameters of the CPM signal and current values of various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase; respectively carrying out signal detection on signals to be detected in a current access window according to standard values and corresponding current values of various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result; and determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results of the continuous multiple sampling windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value. According to the CPM signal detection method and device, different characteristics of CPM signals and noise on the observables of differential phase, peak-to-peak value and amplitude are utilized, phase difference jump detection, modulation index detection and signal amplitude detection are carried out on signals to be detected, and finally comprehensive judgment is carried out on whether the CPM signals arrive or not by utilizing the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result.
It should be understood that the description of this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
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The drawings are for better understanding of the present solution and do not constitute a limitation of the present application. Wherein:
fig. 1 is a schematic flow chart of a signal arrival detection method according to an embodiment of the present application;
fig. 2 is a second flow chart of a signal arrival detection method according to an embodiment of the present application;
FIG. 3 is a block flow diagram of signal arrival detection provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a signal arrival detection apparatus according to an embodiment of the present application;
fig. 5 is a block diagram of an electronic device for implementing a signal arrival detection method according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Before describing the embodiments of the present application, it should be noted that: the signal arrival detection method of the present application detects a CPM signal, that is, the receiver detects whether the received signal (i.e., the signal to be detected) is a CPM signal. Optionally, the signal arrival detection method of the present application may be used to detect whether other signals arrive only by changing the CPM signal in the signal arrival detection method of the present application to other signals.
Example 1
Fig. 1 is a schematic flow chart of a signal arrival detection method according to an embodiment of the present application, where the embodiment is applicable to a situation that a receiver detects whether a CPM signal arrives. The signal arrival detection method provided by the embodiment of the present application may be performed by a signal arrival detection apparatus provided by the embodiment of the present application, where the apparatus may be implemented by software and/or hardware, and integrated into an electronic device that performs the method. Preferably, the electronic device in the embodiment of the present application may be a receiver, and the receiver may be a CPM receiver.
Referring to fig. 1, the method of the present embodiment includes, but is not limited to, the following steps:
s110, determining a first time delay differential phase and an amplitude value of the signal to be detected, and determining a second time delay differential phase of the continuous phase modulation CPM signal.
In the embodiment of the application, the receiver receives the signal to be detected, determines the delay differential phase and the amplitude value of the signal to be detected through a preset algorithm, and marks the delay differential phase and the amplitude value as a first delay differential phase. And determining the time delay differential phase of the continuous phase modulation CPM signal by adopting a preset algorithm, and recording the time delay differential phase as a second time delay differential phase. The preset algorithm is not limited in this application, and a coordinate rotation digital computing (Coordinate Rotation Digital Computer, CORDIC) algorithm is optional. It should be noted that, in order to facilitate the arrival of the detection signal of the receiver, the signal to be detected and the CPM signal are converted into corresponding discretized signals by the analog-to-digital converter.
Specifically, the determining process of the first delay differential phase is as follows: acquiring modulation parameters of a signal to be detected and a CPM signal, and determining a delay factor according to the modulation parameters; and determining a first delay differential phase of the signal to be detected according to the phase of the signal to be detected and the delay factor.
In the embodiment of the application, the delay factor deltan is calculated according to the frequency pulse function g (n), the modulation order M and the modulation index h in the CPM modulation format. The value of deltan should be greater than 0 and less than the duration of the frequency pulse function g (n). Illustratively, when the CPM signal is a continuous phase frequency shift keying (Continuous Phase Frequency Shift Keying, CPFSK) signal, the delay factor is equal to the number of samples of the CPM signal, i.e., Δn=s; when the CPM signal is a gaussian frequency pulse function with a bandwidth time product of 0.25,2 order modulation, the delay factor is equal to 2 times the sampling point number of the CPM signal, i.e., Δn=2s, where S is the sampling point number of the CPM signal.
In the embodiment of the application, the phase Θ (n) and the amplitude value |y (n) | of the signal to be detected are calculated by adopting a CORDIC algorithm. Then calculating a first delay differential phase delta theta according to the phase theta (n) of the signal to be detected and the delay factor delta n Δn (n) =Θ (n) - Θ (n- Δn), where n is time.
Specifically, determining the second delay differential phase of the continuous phase modulated CPM signal includes: and determining a second delay differential phase of the CPM signal according to the phase of the CPM signal, the delay factor and the modulation value in the modulation parameter.
In the embodiment of the application, the CORDIC algorithm is used to calculate the phase phi (n; alpha) of the CPM signal. Calculating a second time according to the phase phi (n; alpha), the delay factor delta n and the modulation value alpha in the modulation parameter of the CPM signalDelay differential phase signal delta phi Δn (n；α)＝2πh∑ i≤k α iPΔn (n-iS), wherein i iS the ith CPM signal of the continuous plurality of CPM signals, the values are 1 to k, h iS the modulation index, S iS the sampling point number of the CPM signal, n iS the time, and p Δn (n) is a differential phase pulse waveform.
It should be appreciated that when the signal to be detected is a CPM signal, the first delay differential phase is equal to the second delay differential phase, i.e., ΔΘ Δn (n)＝Δφ Δn (n; α); when the signal to be detected is CPM signal plus noise, the first delay differential phase is equal to the second delay differential phase plus noise differential phase, namely
Figure BDA0003451801600000061
Figure BDA0003451801600000062
When the signal to be detected is noise, the first delay differential phase is equal to the noise differential phase, i.e. +.>
Figure BDA0003451801600000063
Wherein,,
Figure BDA0003451801600000064
the noise differential phase is represented, α is the modulation value, and n is the time.
Preferably, after determining the first delay differential phase of the signal to be detected, the method further comprises: if the first delay differential phase is greater than pi, i.e. ΔΘ Δn (n) > pi, the first delay differential phase is subtracted by 2pi, ΔΘ Δn (n)＝ΔΘ Δn (n) -2 pi, if the first delay differential phase is less than minus pi, i.e. DeltaΘ Δn (n) < -pi, the first delay differential phase is added by 2pi, i.e., ΔΘ Δn (n)＝ΔΘ Δn (n) +2pi, thereby obtaining a corrected first delay differential phase.
S120, determining standard values of various parameters of the CPM signal and current values of various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase.
The standard values of the various parameters comprise standard absolute values, standard peak-to-peak values and standard amplitude values, and the current values of the various parameters comprise current absolute values, current peak-to-peak values and average amplitude values. The window is a tool for intercepting the signal to be detected from the signal to be detected by the length K of the window symbol.
Specifically, the determining process of the standard value and the current value of each type of parameter is as follows: determining the current absolute value and the current peak-to-peak value of the signal to be detected in the current access window according to the first time delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in the last access window of the current access window according to the amplitude value; and determining a standard absolute value and a standard peak-to-peak value corresponding to the CPM signal according to the second time delay differential phase.
In the embodiment of the present application, the current absolute value |ΔΘ Δn Determination procedure of (n) |: respectively calculating K.S first time delay differential phases delta theta in the current access window Δn Absolute value |DeltaΘ of (n) Δn (n) and these absolute values are stored as current absolute values, i.e. the current absolute values are a set comprising K x S absolute values. Determination of the current peak-to-peak: calculating K.S first delay differential phases delta theta in the current access window Δn Peak-to-peak peak=max (ΔΘ) Δn (n))-min(ΔΘ Δn (n)). Average amplitude value avg in current fetch window Currently, the method is that Is defined by the following formula: avg Currently, the method is that ＝sqrt(∑ n |y(n)| 2 /(K x S)). Standard amplitude value avg Upper part Is determined by the following steps: calculating average amplitude avg in last fetch window of current fetch window Upper part ＝sqrt(∑ n |y(n)| 2 /(K x S)) as a standard amplitude value. Determination of standard absolute value ABSMAX: finding to obtain delta phi Δn Maximum value max (delta phi) of (n; alpha) Δn (n; alpha)) and a minimum value min (delta phi) Δn (n; α)), a maximum value of the phase difference absolute value is calculated as a standard absolute value, that is, absmax=max (abs (max), abs (min)). The standard peak-to-peak PEAKPEAK determination formula: peakpeak=max (ΔΦ) Δn (n；α))-min(Δφ Δn (n; α)). Wherein K is taken asThe symbol length of the number window, S is the sampling point number of the CPM signal, α is the modulation value, and n is the time.
S130, respectively carrying out signal detection on the signals to be detected in the current access window according to the standard values of various parameters and the corresponding current values to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result.
In the embodiment of the present application, after determining the standard absolute value, the standard peak value and the standard amplitude value in the standard values of the various parameters and the current absolute value, the current peak value and the average amplitude value in the current values of the various parameters in the step S120, signal detection is performed on the signals to be detected in the current access window according to the standard values of the various parameters and the corresponding current values.
Optionally, performing phase difference jump detection on the signal to be detected in the current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result; according to the standard peak value and the current peak value, carrying out modulation index detection on a signal to be detected in a current access window to obtain a modulation index detection result; and carrying out signal amplitude detection on the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result.
And S140, determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results of the continuous multiple access windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value.
In the embodiment of the present application, the current access window is included in a plurality of consecutive access windows, and the current access window may be one of the plurality of consecutive access windows. And comprehensively judging whether the CPM signal arrives or not by utilizing the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result on a plurality of continuous sampling windows.
Specifically, determining a fourth threshold according to the number of the continuous multiple access windows; adding the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results on a plurality of continuous sampling windows to obtain a comprehensive detection value of the signal to be detected; and judging whether the comprehensive detection value is smaller than a fourth threshold value, if not, the signal arrival detection result is successful, and if so, repeatedly executing the steps of determining the first delay differential phase and the amplitude value of the signal to be detected and determining the second delay differential phase of the continuous phase modulation CPM signal.
In the embodiment of the present application, first, the fourth threshold value Thr 4 The number Q equal to the number of consecutive access windows multiplied by a scaling factor Scale, i.e. Thr 4 =q×scale, wherein Q and Scale are configurable. Then, calculate the comprehensive detection value on the current Q continuous fetch windows
Figure BDA0003451801600000091
Figure BDA0003451801600000092
Wherein EstFlag is the comprehensive detection value, estFlag 1 EstFlag as the phase difference jump detection result 2 For modulating the index detection result, estFlag 3 Q is the q-th fetch window of the continuous multiple fetch windows for the signal amplitude detection result. Finally, judging whether the comprehensive detection value EstFlag is smaller than a fourth threshold value Thr 4 If EstFlag is not less than Thr 4 And (5) indicating that the signal to be detected is a CPM signal, if the signal reaches the detection successfully, otherwise, continuing to take the data of a fetch window, and repeating the steps from S110 to S140.
According to the technical scheme provided by the embodiment, the second time delay differential phase of the CPM signal is determined by determining the first time delay differential phase and the amplitude value of the signal to be detected; determining standard values of various parameters of the CPM signal and current values of various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase; respectively carrying out signal detection on signals to be detected in a current access window according to standard values and corresponding current values of various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result; and determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results of the continuous multiple sampling windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value. According to the CPM signal detection method and device, different characteristics of CPM signals and noise on the observables of differential phase, peak-to-peak value and amplitude are utilized, phase difference jump detection, modulation index detection and signal amplitude detection are carried out on signals to be detected, and finally comprehensive judgment is carried out on whether the CPM signals arrive or not by utilizing the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result.
Example two
Fig. 2 is a second flow chart of a signal arrival detection method according to an embodiment of the present application; fig. 3 is a flow chart of signal arrival detection according to an embodiment of the present application. The embodiment of the application is optimized based on the embodiment, and is specifically: the present embodiment explains the phase difference jump detection process, the modulation index detection process, and the signal amplitude detection process in detail.
Referring to fig. 2, the method of the present embodiment includes, but is not limited to, the following steps:
s210, determining a first delay differential phase and an amplitude value of a signal to be detected, and determining a second delay differential phase of a continuous phase modulation CPM signal.
S220, determining the current absolute value and the current peak-to-peak value of the signal to be detected in the current access window according to the first time delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in the last access window of the current access window according to the amplitude value; and determining a standard absolute value and a standard peak-to-peak value corresponding to the CPM signal according to the second time delay differential phase.
And S230, performing phase difference jump detection on the signal to be detected in the current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result.
In the embodiment of the application, the second delay differential phase delta phi of the CPM signal Δn Is of finite interval and noise differential phase
Figure BDA0003451801600000101
Is random and infinite. By utilizing the characteristic, CPM signals and noise can be distinguished, so that phase difference jump detection can be carried out on signals to be detected.
Specifically, the phase difference jump detection process includes: determining a first threshold corresponding to the standard absolute value according to the standard absolute value and the modulation parameter of the CPM signal; determining the number of the current absolute value larger than a first threshold value in the current access window; and determining a phase difference jump detection result of the signals to be detected according to the number.
In the embodiment of the present application, after calculating the standard absolute value ABSMAX in the step S220, the first threshold Thr is set by combining the modulation order and the modulation index in the modulation parameter of the CPM signal 1 Specifically, as shown in formula (1):
Thr 1 ＝ABSMAX*max(1.5/h/(M-1)，1.2) (1)
wherein Thr 1 A first threshold value corresponding to the standard absolute value is represented; ABSMAX represents a standard absolute value; h represents a modulation index; m represents the modulation order, and max () represents the maximum value.
In the embodiment of the present application, first, the current absolute value |ΔΘ Δn (n) | refers to K x S first delay differential phases ΔΘ within the current fetch window Δn Absolute value of (n), statistics of |ΔΘ Δn The number of (n) | greater than the first threshold is expressed as Num 1 . Then, a number threshold num=k×s×prcnt is set. Wherein K is the symbol length of a sampling window, S is the sampling point number of the CPM signal, prcnt is a percentage, and both K and Prcnt are configurable. Finally, if Num 1 If the detected signal is less than Num, outputting EstFlag if the detected signal in the current sampling window is CPM signal or CPM signal plus noise 1 =1; if Num 1 If the signal is greater than or equal to Num, the signal to be detected in the current access window is noise, and EstFlag is output 1 =0, thereby obtaining a phase difference jump detection result EstFlag of the signal to be detected 1 。
S240, carrying out modulation index detection on the signal to be detected in the current access window according to the standard peak value and the current peak value to obtain a modulation index detection result.
In the embodiment of the application, the receiver knows the modulation index of the CPM signal to be received, and can distinguish the CPM signal from noise by using the modulation index information, so that the modulation index detection can be performed on the signal to be detected.
Specifically, the modulation index detection process comprises the following steps: determining a second threshold interval corresponding to the standard peak value according to the standard peak value and the system proportion coefficient; and determining whether the current peak value in the current access window is in a second threshold value interval, thereby obtaining a modulation index detection result of the signal to be detected. Wherein the system scaling factor comprises a first scaling factor and a second scaling factor.
In this embodiment of the present application, after the standard peak-to-peak value PEAKPEAK is calculated in the step S220, a second threshold interval corresponding to the standard peak-to-peak value is determined according to the standard peak-to-peak value and the system scaling factor, specifically as shown in formulas (2) - (3):
Figure BDA0003451801600000121
Figure BDA0003451801600000122
wherein,,
Figure BDA0003451801600000123
a right boundary representing a second threshold interval; />
Figure BDA0003451801600000124
A left boundary representing a second threshold interval; PEAKPEAK represents a standard peak-to-peak value; the UpRatio represents a first scale factor corresponding to the right boundary; downRatio represents a second scaling factor corresponding to the left boundary. />
In this embodiment, first, the peak value peak in the current access window is calculated, and it is determined whether the peak value of the current peak in the current access window is within the second threshold interval, that is
Figure BDA0003451801600000125
Figure BDA0003451801600000126
If the detected signal in the current access window is CPM signal or CPM signal plus noise in the second threshold interval, outputting EstFlag 2 =1; otherwise, the current access window is noise and outputs EstFlag 2 =0, thereby obtaining a modulation index detection result EstFlag of the signal to be detected 2 。
S250, detecting the signal amplitude of the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result.
In the embodiment of the application, when the signal to be detected received by the receiver is changed from noise to noise plus the CPM signal, the amplitude of the signal to be detected becomes large; when the signal to be detected is always a CPM signal, the amplitude of the signal to be detected is kept unchanged; when the signal to be detected is always noise, the amplitude of the signal to be detected frequently changes. With this feature, the CPM signal and noise can be distinguished, so that signal amplitude detection can be performed on the signal to be detected.
Specifically, the signal amplitude detection process comprises the following steps: determining a third threshold corresponding to the standard amplitude value according to the standard amplitude value and a preset amplitude lifting amount; and determining whether the average amplitude value in the current access window is larger than a third threshold value, thereby obtaining a signal amplitude detection result of the signal to be detected. The amplitude lifting amount refers to an adjustment amount for adjusting the standard amplitude value.
In the embodiment of the present application, the standard amplitude value avg is calculated through the step S220 Upper part Then, setting a third threshold Thr in combination with the preset amplitude lifting amount 3 Specifically, as shown in formula (4):
Thr 3 ＝avg upper part *Ratio (4)
Wherein Thr 3 A third threshold value corresponding to the standard amplitude value is represented; avg Upper part Representing a standard amplitude value; ratio is the magnitude of the rise.
In the embodiment of the present application, first, the current is calculatedAverage amplitude of K.times.S samples in the sampling window, i.e. avg Currently, the method is that ＝sqrt(∑ n |y(n)| 2 /(K x S)); then, the average amplitude value aVg in the current fetch window is determined Currently, the method is that Whether or not it is greater than a third threshold value Thr 3 If the signal is larger than the threshold value, outputting EstFlag, wherein the signal to be detected in the current access window is a CPM signal or is the CPM signal plus noise 3 =1; if the signal is less than or equal to the noise, outputting EstFlag 3 =0, thereby obtaining a signal amplitude detection result EstFlag of the signal to be detected 3 。
S260, determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result of the continuous multiple access windows, and determining that the signal of the signal to be detected reaches the detection result according to the comprehensive detection value, wherein the current access window is included in the continuous multiple access windows.
In this embodiment, as shown in fig. 3, which is a flow chart of signal arrival detection, the signal arrival detection module includes a phase difference jump detection sub-module, a modulation index detection sub-module, a signal amplitude detection sub-module, and a comprehensive decision sub-module. In the figure, y (n) is a signal to be detected, the signal to be detected is subjected to phase difference jump detection, modulation index detection and signal amplitude detection after phase difference calculation, and finally, comprehensive judgment is carried out on whether the CPM signal arrives or not by using a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result. The signal arrival detection module in fig. 3 further includes a reference calculation sub-module, which is a standard value for calculating various parameters of the CPM signal, including a standard absolute value, a standard peak-to-peak value, and a standard amplitude value. The phase difference calculating module in fig. 3 is configured to calculate a first delay differential phase of the signal to be detected according to the signal to be detected and the delay factor. The delay calculation module in fig. 3 is used to calculate the delay factor.
It should be noted that the phase difference jump detection sub-module, the modulation index detection sub-module, and the signal amplitude detection sub-module may be configured to be turned on and off separately, that is, one skilled in the art may select one or any two of the three detection sub-modules appropriately according to the capability of the receiver, if all the three sub-modules are selected, the signal arrival detection result is more accurate.
According to the technical scheme provided by the embodiment, the first time delay differential phase and the amplitude value of the signal to be detected are determined, the second time delay differential phase of the continuous phase modulation CPM signal is determined, and the current absolute value and the current peak value of the signal to be detected in the current access window are determined according to the first time delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in the last access window of the current access window according to the amplitude value; determining a standard absolute value and a standard peak value corresponding to the CPM signal according to the second time delay differential phase; according to the standard absolute value and the current absolute value, performing phase difference jump detection on the signal to be detected in the current access window to obtain a phase difference jump detection result; according to the standard peak value and the current peak value, carrying out modulation index detection on a signal to be detected in a current access window to obtain a modulation index detection result; according to the standard amplitude value and the average amplitude value, signal amplitude detection is carried out on the signal to be detected in the current access window to obtain a signal amplitude detection result; and determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results of the continuous multiple sampling windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value. According to the CPM signal detection method and device, different characteristics of CPM signals and noise on the observables of differential phase, peak-to-peak value and amplitude are utilized, phase difference jump detection, modulation index detection and signal amplitude detection are carried out on signals to be detected, and finally comprehensive judgment is carried out on whether the CPM signals arrive or not by utilizing the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result.
Example III
Fig. 4 is a schematic structural diagram of a signal arrival detection apparatus provided in an embodiment of the present application, where the apparatus is integrated in a receiver, as shown in fig. 4, the apparatus 400 may include:
the signal determining module 410 is configured to determine a first delay differential phase and an amplitude value of the signal to be detected, and determine a second delay differential phase of the continuous phase modulated CPM signal.
And the parameter determining module 420 is configured to determine standard values of various parameters of the CPM signal and current values of the various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase.
And the parameter detection module 430 is configured to perform signal detection on the signal to be detected in the current access window according to the standard values and the corresponding current values of the various parameters, so as to obtain a phase difference jump detection result, a modulation index detection result, and a signal amplitude detection result.
The signal arrival detection module 440 is configured to determine a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result, and the signal amplitude detection result of a plurality of consecutive access windows, and determine a signal arrival detection result of the signal to be detected according to the comprehensive detection value, where the current access window is included in the plurality of consecutive access windows.
Optionally, the standard values of the various parameters include standard absolute values, standard peak-to-peak values and standard amplitude values, and the current values of the various parameters include current absolute values, current peak-to-peak values and average amplitude values.
Further, the parameter determining module 420 may be specifically configured to: determining the current absolute value and the current peak-to-peak value of the signal to be detected in the current access window according to the first time delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in a last access window of the current access window according to the amplitude value; and determining a standard absolute value and a standard peak-to-peak value corresponding to the CPM signal according to the second time delay differential phase.
Further, the parameter detection module 430 may include: a first detection unit, a second detection unit, and a third detection unit;
the first detection unit is used for performing phase difference jump detection on the signal to be detected in the current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result;
the second detection unit is configured to perform modulation index detection on the signal to be detected in the current access window according to the standard peak-to-peak value and the current peak-to-peak value to obtain a modulation index detection result;
And the third detection unit is used for detecting the signal amplitude of the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result.
Further, the first detection unit may be specifically configured to determine a first threshold corresponding to the standard absolute value according to the standard absolute value and a modulation parameter of the CPM signal; determining the number of the current absolute value larger than the first threshold value in a current access window; and determining a phase difference jump detection result of the signals to be detected according to the number.
Further, the second detection unit may be specifically configured to determine a second threshold interval corresponding to the standard peak-to-peak value according to the standard peak-to-peak value and the system scaling factor; and determining whether the current peak value in the current access window is in the second threshold value interval, so as to obtain a modulation index detection result of the signal to be detected.
Further, the third detection unit may be specifically configured to determine a third threshold value corresponding to the standard amplitude value according to the standard amplitude value and a preset amplitude lifting amount; and determining whether the average amplitude value in the current access window is larger than a third threshold value, thereby obtaining a signal amplitude detection result of the signal to be detected.
Further, the signal arrival detection module 440 may be specifically configured to: determining a fourth threshold according to the number of the continuous multiple access windows; adding the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results on the continuous multiple sampling windows to obtain a comprehensive detection value of the signal to be detected; and judging whether the comprehensive detection value is smaller than the fourth threshold value, if not, the signal arrival detection result is successful, and if so, repeatedly executing the steps of determining the first delay differential phase and the amplitude value of the signal to be detected and determining the second delay differential phase of the continuous phase modulation CPM signal.
Further, the signal determining module 410 may be specifically configured to obtain modulation parameters of the signal to be detected and the CPM signal, and determine a delay factor according to the modulation parameters; determining a first delay differential phase of the signal to be detected according to the phase of the signal to be detected and the delay factor; and determining a second delay differential phase of the CPM signal according to the phase of the CPM signal, the delay factor and the modulation value in the modulation parameter.
Further, the signal arrival detection apparatus may further include: a phase correction module;
the phase correction module is configured to, after determining a first delay differential phase of a signal to be detected, subtract 2pi from the first delay differential phase if the first delay differential phase is greater than pi, and add 2pi to the first delay differential phase if the first delay differential phase is less than negative pi, thereby obtaining a corrected first delay differential phase.
The signal arrival detection apparatus provided in this embodiment is applicable to the signal arrival detection method provided in any of the above embodiments, and has corresponding functions and beneficial effects.
Example IV
Fig. 5 is a block diagram of an electronic device for implementing a signal arrival detection method according to an embodiment of the present application, and fig. 5 shows a block diagram of an exemplary electronic device suitable for implementing an implementation of an embodiment of the present application. The electronic device shown in fig. 5 is only an example, and should not be construed as limiting the functionality and scope of application of the embodiments of the present application. The electronic device may typically be a smart phone, a tablet computer, a notebook computer, a vehicle-mounted terminal, a wearable device, etc. Preferably, the electronic device in the embodiment of the present application may be a receiver, and the receiver may be a CPM receiver.
As shown in fig. 5, the electronic device 500 is embodied in the form of a general purpose computing device. The components of electronic device 500 may include, but are not limited to: one or more processors or processing units 516, a memory 528, a bus 518 that connects the various system components (including the memory 528 and the processing unit 516).
Bus 518 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Electronic device 500 typically includes many types of computer system readable media. Such media can be any available media that is accessible by electronic device 500 and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 528 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 530 and/or cache memory 532. Electronic device 500 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 534 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, commonly referred to as a "hard disk drive"). Although not shown in fig. 5, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 518 through one or more data media interfaces. Memory 528 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the embodiments of the present application.
A program/utility 540 having a set (at least one) of program modules 542 may be stored in, for example, memory 528, such program modules 542 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 542 generally perform the functions and/or methods described in the embodiments herein.
The electronic device 500 may also communicate with one or more external devices 514 (e.g., keyboard, pointing device, display 524, etc.), one or more devices that enable a user to interact with the electronic device 500, and/or any devices (e.g., network card, modem, etc.) that enable the electronic device 500 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 522. Also, the electronic device 500 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through a network adapter 520. As shown in fig. 5, the network adapter 520 communicates with other modules of the electronic device 500 over the bus 518. It should be appreciated that although not shown in fig. 5, other hardware and/or software modules may be used in connection with electronic device 500, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 516 executes various functional applications and data processing by running a program stored in the memory 528, for example, implementing the signal arrival detection method provided in any of the embodiments of the present application.
Example six
Embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program (or referred to as computer-executable instructions) that, when executed by a processor, is operable to perform the signal arrival detection method provided in any of the above embodiments of the present application.
Any combination of one or more computer readable media may be employed as the computer storage media of the embodiments herein. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), a erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for embodiments of the present application may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of remote computers, the remote computer may be connected to the user computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (e.g., connected through the internet using an internet service provider).

Claims (10)

1. A method of signal arrival detection, the method being applied to a receiver, the method comprising:
determining a first delay differential phase and an amplitude value of a signal to be detected, and determining a second delay differential phase of a continuous phase modulation CPM signal;
determining a standard value of each type of parameter of the CPM signal and a current value of each type of parameter of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase, wherein the standard value of each type of parameter comprises a standard absolute value, a standard peak-to-peak value and a standard amplitude value, and the current value of each type of parameter comprises a current absolute value, a current peak-to-peak value and an average amplitude value, and the method comprises the following steps: determining the current absolute value and the current peak-to-peak value of the signal to be detected in the current access window according to the first time delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in a last access window of the current access window according to the amplitude value; determining a standard absolute value and a standard peak value corresponding to the CPM signal according to the second time delay differential phase;
Respectively carrying out signal detection on the signal to be detected in the current access window according to the standard value and the corresponding current value of the various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result, wherein the method comprises the following steps: performing phase difference jump detection on the signal to be detected in the current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result; carrying out modulation index detection on the signal to be detected in the current access window according to the standard peak-to-peak value and the current peak-to-peak value to obtain a modulation index detection result; performing signal amplitude detection on the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result;
and determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result of a plurality of continuous access windows, and determining a signal arrival detection result of the signal to be detected according to the comprehensive detection value, wherein the current access window is included in the plurality of continuous access windows.
2. The method for detecting signal arrival according to claim 1, wherein said performing phase difference jump detection on the signal to be detected in a current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result includes:
determining a first threshold corresponding to the standard absolute value according to the standard absolute value and a modulation parameter of the CPM signal;
determining the number of the current absolute value larger than the first threshold value in a current access window;
and determining a phase difference jump detection result of the signals to be detected according to the number.
3. The signal arrival detection method according to claim 1, wherein said performing modulation index detection on the signal to be detected in a current access window according to the standard peak-to-peak value and the current peak-to-peak value to obtain a modulation index detection result includes:
determining a second threshold interval corresponding to the standard peak value according to the standard peak value and the system proportion coefficient;
and determining whether the current peak value in the current access window is in the second threshold value interval, so as to obtain a modulation index detection result of the signal to be detected.
4. The signal arrival detection method according to claim 1, wherein said performing signal amplitude detection on the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result includes:
Determining a third threshold corresponding to the standard amplitude value according to the standard amplitude value and a preset amplitude lifting amount;
and determining whether the average amplitude value in the current access window is larger than a third threshold value, thereby obtaining a signal amplitude detection result of the signal to be detected.
5. The signal arrival detection method according to claim 1, wherein said determining a composite detection value of said signal to be detected from said phase difference jump detection result, said modulation index detection result, and said signal amplitude detection result of a plurality of consecutive access windows, determining a signal arrival detection result of said signal to be detected from said composite detection value, comprises:
determining a fourth threshold according to the number of the continuous multiple access windows;
adding the phase difference jump detection results, the modulation index detection results and the signal amplitude detection results on the continuous multiple sampling windows to obtain a comprehensive detection value of the signal to be detected;
and judging whether the comprehensive detection value is smaller than the fourth threshold value, if not, the signal arrival detection result is successful, and if so, repeatedly executing the steps of determining the first delay differential phase and the amplitude value of the signal to be detected and determining the second delay differential phase of the continuous phase modulation CPM signal.
6. The method of claim 1, wherein determining a first delayed differential phase of a signal to be detected comprises:
acquiring modulation parameters of the signal to be detected and the CPM signal, and determining a delay factor according to the modulation parameters;
determining a first delay differential phase of the signal to be detected according to the phase of the signal to be detected and the delay factor;
correspondingly, the determining the second delay differential phase of the continuous phase modulated CPM signal includes:
and determining a second delay differential phase of the CPM signal according to the phase of the CPM signal, the delay factor and the modulation value in the modulation parameter.
7. The signal arrival detection method according to claim 1, further comprising, after determining the first delayed differential phase of the signal to be detected:
and if the first delay differential phase is larger than pi, subtracting 2 pi from the first delay differential phase, and if the first delay differential phase is smaller than negative pi, adding 2 pi to the first delay differential phase, so as to obtain the corrected first delay differential phase.
8. A signal arrival detection apparatus, said apparatus being integrated with a receiver, said apparatus comprising:
The signal determining module is used for determining a first time delay differential phase and an amplitude value of the signal to be detected and determining a second time delay differential phase of the continuous phase modulation CPM signal;
the parameter determining module is used for determining standard values of various parameters of the CPM signal and current values of the various parameters of the signal to be detected in a current access window according to the first delay differential phase, the amplitude value and the second delay differential phase, wherein the standard values of the various parameters comprise standard absolute values, standard peak-to-peak values and standard amplitude values, and the current values of the various parameters comprise current absolute values, current peak-to-peak values and average amplitude values;
the parameter detection module is used for respectively carrying out signal detection on the signal to be detected in the current access window according to the standard values and the corresponding current values of the various parameters to respectively obtain a phase difference jump detection result, a modulation index detection result and a signal amplitude detection result;
the signal arrival detection module is used for determining a comprehensive detection value of the signal to be detected according to the phase difference jump detection result, the modulation index detection result and the signal amplitude detection result of a plurality of continuous access windows, and determining the signal arrival detection result of the signal to be detected according to the comprehensive detection value, wherein the current access window is included in the plurality of continuous access windows;
The parameter determining module is specifically configured to determine a current absolute value and a current peak-to-peak value of the signal to be detected in a current access window according to the first delay differential phase; determining an average amplitude value of the signal to be detected in the current access window and a standard amplitude value in a last access window of the current access window according to the amplitude value; determining a standard absolute value and a standard peak value corresponding to the CPM signal according to the second time delay differential phase;
the parameter detection module is specifically configured to perform phase difference jump detection on the signal to be detected in the current access window according to the standard absolute value and the current absolute value to obtain a phase difference jump detection result; carrying out modulation index detection on the signal to be detected in the current access window according to the standard peak-to-peak value and the current peak-to-peak value to obtain a modulation index detection result; and detecting the signal amplitude of the signal to be detected in the current access window according to the standard amplitude value and the average amplitude value to obtain a signal amplitude detection result.
9. An electronic device, the electronic device comprising:
one or more processors;
A storage means for storing one or more programs;
when executed by the one or more processors, causes the one or more processors to implement the signal arrival detection method of any one of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a signal arrival detection method according to any one of claims 1 to 7.
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