CN109150343B - Collision signal detection method and device, communication equipment and storage medium - Google Patents
Collision signal detection method and device, communication equipment and storage medium Download PDFInfo
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- CN109150343B CN109150343B CN201811214259.0A CN201811214259A CN109150343B CN 109150343 B CN109150343 B CN 109150343B CN 201811214259 A CN201811214259 A CN 201811214259A CN 109150343 B CN109150343 B CN 109150343B
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Abstract
The embodiment of the invention discloses a method and a device for detecting a collision signal, communication equipment and a storage medium. The method comprises the following steps: receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed; performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal; and determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and the conjugate frequency domain signals of the baseband frequency domain signals. The technical scheme of the embodiment of the invention solves the technical defect that important weak signals are lost because only the strongest signal is received blindly by the strongest signal selection method under the condition of not determining whether the collision signals exist or not in the prior art, realizes the purpose of rapidly and accurately determining whether the double-sideband amplitude modulation communication signals comprise the collision signals or not, and provides effective reference information for the subsequent signal processing.
Description
Technical Field
The embodiments of the present invention relate to the field of signal processing technologies of wireless communications, and in particular, to a method and an apparatus for detecting a collision signal, a communication device, and a storage medium.
Background
Standard double sideband amplitude modulation is one of the common signal modulation methods, and is widely applied to voice communication systems. The principle is that the amplitude of the high-frequency carrier is controlled by a modulation signal and is changed linearly along with the modulation signal. When a plurality of nodes send signals to one receiving node simultaneously in a double-sideband amplitude modulation mode, multi-node collision occurs, and if corresponding measures are not taken, communication accidents can be caused.
In the prior art, a strongest signal selection method is adopted to avoid the problem of signal collision, and the strongest signal selection method compares and judges the strengths of a plurality of received signals, suppresses low signals and reserves a path of strongest signal. The method can avoid the problem that the received signals are distorted and can not be distinguished due to mutual coverage of the signals when a plurality of signals are transmitted simultaneously.
In the process of implementing the invention, the inventor finds that the prior art has the following defects: the strongest signal selection method filters weak signals, and the receiving node only receives one path of strongest signals, so that a multi-node collision event is not perceived, and a communication accident is caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for detecting a collision signal, a communication device, and a storage medium, so as to optimize an existing communication method, and achieve accurate determination of whether a collision signal exists in a received signal, so that corresponding signal processing may be performed according to a detection result.
In a first aspect, an embodiment of the present invention provides a method for detecting a collision signal, which is applied to a double-sideband amplitude modulation communication system, and includes:
receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed;
performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal;
and determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and conjugate frequency domain signals of the baseband frequency domain signals.
In the above method, optionally, the determining, according to the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal, whether there is a collision signal in the signal to be processed includes:
subtracting the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference frequency spectrum;
judging whether a frequency point with an amplitude value larger than a collision amplitude threshold exists in the difference frequency spectrum;
and if frequency points with amplitude values larger than the collision amplitude threshold exist in the difference frequency spectrum, determining that collision signals exist in the signals to be processed.
In the foregoing method, optionally, before the determining whether there is a frequency point in the difference spectrum whose amplitude value is greater than the collision amplitude threshold, the method further includes:
determining the collision amplitude threshold according to the current noise level.
In the foregoing method, optionally, the receiving a signal to be processed and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed includes:
receiving the signal to be processed, and converting the signal to be processed into a frequency domain signal to be processed;
and determining a frequency value corresponding to the frequency component with the maximum amplitude value in the frequency domain signal to be processed as a down-conversion frequency value.
In the foregoing method, optionally, the performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal includes:
performing frequency mixing processing on the signal to be processed according to the down-conversion frequency value to obtain a frequency mixing signal;
carrying out low-pass filtering processing on the mixing signal by using a low-pass filter to obtain a baseband signal to be processed;
and converting the baseband signal to be processed into a baseband frequency domain signal.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting a collision signal, applied to a double-sideband amplitude modulation communication system, including:
the signal receiving module is used for receiving a signal to be processed and determining a down-conversion frequency value according to the amplitude value of the frequency domain signal to be processed corresponding to the signal to be processed;
the baseband frequency domain signal determining module is used for performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal;
and the collision signal determining module is used for determining whether a collision signal exists in the signal to be processed according to the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal.
In the above apparatus, optionally, the collision signal determination module includes:
a difference spectrum determining unit, configured to subtract the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference spectrum;
the frequency point determining unit is used for judging whether a frequency point with an amplitude value larger than a collision amplitude threshold value exists in the difference frequency spectrum;
and the collision signal determination unit is used for determining that a collision signal exists in the signal to be processed if a frequency point with an amplitude value larger than a collision amplitude threshold exists in the difference frequency spectrum.
In the above apparatus, optionally, the apparatus further includes:
and the collision amplitude threshold value determining unit is used for determining the collision amplitude threshold value according to the current noise level before judging whether the frequency point with the amplitude value larger than the collision amplitude threshold value exists in the difference frequency spectrum.
In a third aspect, an embodiment of the present invention provides a communication device, where the communication device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of collision signal detection as described in any embodiment of the invention.
In a fourth aspect, embodiments of the present invention provide a storage medium containing computer-executable instructions for performing a method of collision signal detection according to any of the embodiments of the present invention when executed by a computer processor.
The embodiment of the invention provides a method, a device, a communication device and a storage medium for detecting a collision signal, which utilize the symmetry of a frequency spectrum when the double-sideband amplitude modulation communication signal has no collision signal and the asymmetry of the frequency spectrum when the collision signal exists, accurately determine whether the collision signal exists in the current received signal according to a baseband frequency domain signal corresponding to the received signal and a conjugate frequency domain signal thereof, solve the technical defect that important weak signals are lost because only the strongest signal is received by a strongest signal selection method blindly under the condition that whether the collision signal exists is not determined in the prior art, realize the purpose of rapidly and accurately determining whether the double-sideband amplitude modulation communication signal comprises the collision signal, and provide effective reference information for the subsequent signal processing.
Drawings
Fig. 1 is a flowchart of a method for detecting a collision signal according to an embodiment of the present invention;
fig. 2a is a flowchart of a method for detecting a collision signal according to a second embodiment of the present invention;
fig. 2b is a time domain diagram of a total signal including three signals according to the second embodiment of the present invention;
FIG. 2c is a spectral diagram of a frequency domain signal corresponding to the total signal in FIG. 2 b;
FIG. 2d is a frequency spectrum diagram corresponding to a baseband frequency domain signal obtained after the time domain signal in FIG. 2b and the 10Hz signal are sequentially subjected to frequency mixing, low-pass filtering and time-frequency conversion;
FIG. 2e is a difference spectrum corresponding to a signal obtained by subtracting the baseband frequency domain signal and the conjugate frequency domain signal in FIG. 2 d;
fig. 3 is a structural diagram of a collision signal detection device according to a third embodiment of the present invention;
fig. 4 is a structural diagram of a communication device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a method for detecting a collision signal according to an embodiment of the present invention, where the method of this embodiment may be performed by a device for detecting a collision signal, the device may be implemented by hardware and/or software, and may be generally integrated in a communication device, such as a base station. The method of the embodiment specifically includes:
s101, receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed.
In this embodiment, the signal to be processed specifically refers to a digital time domain signal corresponding to a signal after double-sideband amplitude modulation transmitted between signal transceiver devices in a double-sideband amplitude modulation communication system. It is known that, generally, analog time domain signals are transmitted between transceiving devices in a signal communication system, and after the transceiving devices receive the analog time domain signals, the analog time domain signals are firstly converted into digital time domain signals, and then, subsequent signal processing operations are performed. Similarly, in this embodiment, the signal to be processed is also a digital time domain signal, which is obtained by performing analog-to-digital conversion on the received analog time domain signal.
In this embodiment, the frequency domain signal to be processed specifically refers to a frequency domain signal obtained after the time-frequency conversion of the signal to be processed.
In this embodiment, the down-conversion frequency value specifically refers to a frequency value used for performing down-conversion processing on a frequency domain signal to be processed corresponding to the signal to be processed. It is known that, in the existing hardware products such as chips for processing communication signals, high-frequency signals cannot be directly processed, and therefore, the high-frequency signals need to be converted into low-frequency signals and then processed. Therefore, in this embodiment, it is first required to determine a down-conversion frequency value, and then, the down-conversion processing is performed on the signal to be processed according to the down-conversion frequency value through step 102.
Further, the method for determining the down-conversion frequency value may specifically be to use a frequency value with a maximum amplitude value in the to-be-processed frequency domain signal corresponding to the to-be-processed signal as the down-conversion frequency value, and the like.
It should be noted that, since the existing hardware product for processing the communication signal cannot directly process the high-frequency signal, in the present embodiment, it is necessary to perform down-conversion processing on the signal to be processed to obtain the low-frequency signal. When the hardware product for processing the communication signal can directly process the high-frequency signal, it is not necessary to perform down-conversion processing on the signal to be processed, and it can be determined whether a collision signal exists in the signal to be processed directly according to the frequency domain signal of the signal to be processed and the conjugate frequency domain signal of the frequency domain signal, where the determination method is the same as the method in step 103 in this embodiment.
And S102, performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal.
In this embodiment, the method for performing down-conversion processing on the signal to be processed may specifically be to perform frequency mixing processing on the signal to be processed and a signal corresponding to a down-conversion frequency value to obtain a baseband time domain signal corresponding to the signal to be processed.
Further, since the signal used for determining whether there is a collision signal in the signal to be processed in step 103 is a frequency domain signal, the baseband time domain signal obtained after the frequency mixing process needs to be converted into a baseband frequency domain signal. The method for converting the baseband time domain signal into the baseband frequency domain signal may specifically be converting the time domain signal into the frequency domain signal according to fourier transform, and the like.
S103, determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and the conjugate frequency domain signals of the baseband frequency domain signals.
It is known that the spectrum of a signal obtained by double sideband amplitude modulation of a single signal (i.e., a signal that does not include a collision signal) has bilateral symmetry. If the signal includes the collision signal, the frequency spectrum of the signal after the double-sideband amplitude modulation has no left-right symmetry. In this embodiment, the above characteristics are used to determine whether there is a collision signal in the signal to be processed.
Specifically, if no collision signal exists in the signal to be processed, no signal larger than the collision amplitude threshold exists in the result of subtraction of the baseband frequency domain signal corresponding to the signal to be processed and the conjugate frequency domain signal thereof; if collision signals exist in the signals to be processed, signals larger than a collision amplitude threshold value exist in the result of subtracting the baseband frequency domain signals corresponding to the signals to be processed and the conjugate frequency domain signals thereof, frequency spectrums corresponding to the subtraction result should include frequency components with larger energy, and the signal amplitude values at the frequency values corresponding to the frequency components with larger energy are obviously larger than the signal amplitude values of the surrounding frequency values. When the collision signal is weak in energy and covered by the strongest signal, if the frequency spectrum and the conjugate frequency spectrum are not subtracted, the collision weak signal is covered by the strongest signal and cannot be directly identified from the signal frequency spectrum. After spectral subtraction, the strongest signal component is subtracted. The signal covered by the strongest signal appears spectrally.
The embodiment of the invention provides a method for detecting a collision signal, which accurately determines whether the collision signal exists in the current received signal according to a baseband frequency domain signal corresponding to the received signal and a conjugate frequency domain signal thereof by utilizing the symmetry of a frequency spectrum when the double-sideband amplitude modulation communication signal does not have the collision signal and the asymmetry of the frequency spectrum when the collision signal exists, solves the technical defect that important weak signals are lost because the strongest signal is only received blindly by a strongest signal selection method under the condition that whether the collision signal exists is not determined in the prior art, realizes the rapid and high-accuracy determination of whether the double-sideband amplitude modulation communication signal comprises the collision signal, and provides effective reference information for the subsequent signal processing.
Example two
Fig. 2a is a flowchart of a method for detecting a collision signal according to a second embodiment of the present invention. The present embodiment is optimized based on the above embodiments, and in the present embodiment, specific implementations of a method for specifically determining whether there is a collision signal in a signal to be processed, a method for determining an increased collision amplitude threshold, a method for determining a specific down-conversion frequency value, and a method for obtaining a specific baseband frequency domain signal are provided.
Correspondingly, the method of the embodiment specifically includes:
s201, receiving a signal to be processed, and converting the signal to be processed into a frequency domain signal to be processed.
It can be known that, generally, time domain signals are transmitted between the transceiver devices in the signal communication system, and in order to determine the down-conversion frequency value, in this embodiment, time-frequency conversion needs to be performed on the signal to be processed to obtain a corresponding frequency domain signal to be processed. The time-frequency conversion method may specifically be time-frequency conversion by fourier transform, or the like.
Further, the accuracy of the time-frequency transformation has a certain influence on the detection result of the collision signal, and therefore, the accuracy of the time-frequency transformation should be determined in consideration of the time-frequency transformation time, the calculation amount of the time-frequency transformation, and the required detection accuracy of the collision signal.
Fig. 2b shows a time domain diagram of a total signal including three signals (the frequencies of the three signals are 10Hz, 100Hz and 200Hz respectively), and fig. 2c shows a frequency spectrum diagram of a frequency domain signal corresponding to the time domain signal in fig. 2 b. It can clearly be seen in fig. 2c that the amplitude values at the three frequency values 10Hz, 100Hz and 200Hz are all larger than the amplitude values corresponding to the other frequency values.
S202, determining the frequency value with the maximum amplitude value in the frequency domain signal to be processed as a down-conversion frequency value.
According to the frequency domain signal, the frequency value corresponding to the maximum amplitude value in the frequency domain signal can be accurately determined, and in this embodiment, the frequency value is used as the down-conversion frequency value.
It can be known that the larger the amplitude value is, the stronger the signal at the frequency point corresponding to the amplitude value is. In order to avoid that the signal spectrum corresponding to the collision signal is covered by the spectrum corresponding to the strong signal in the difference spectrum obtained in step 206, in this embodiment, the frequency value with the largest amplitude value in the frequency domain signal to be processed is selected as the down-conversion frequency value, so that the subtraction result obtained in step 206 does not include the spectrum corresponding to the frequency signal with the largest amplitude value.
As shown in fig. 2c, the frequency value with the largest amplitude value is 10 Hz.
And S203, performing frequency mixing processing on the signal to be processed according to the down-conversion frequency value to obtain a frequency mixing signal.
In this embodiment, the signal to be processed is subjected to frequency mixing processing according to the down-conversion frequency value, specifically, the standard sine or cosine signal corresponding to the down-conversion frequency value and the signal to be processed may be used as input signals of the frequency mixer, and the frequency mixing signal output by the frequency mixer is a signal obtained by shifting the frequency spectrum of the signal to be processed by the down-conversion frequency value left and right.
And S204, carrying out low-pass filtering processing on the mixing signal by using a low-pass filter to obtain a baseband signal to be processed.
It will be appreciated that the signals may generate high frequency signals during the mixing process. Therefore, in this embodiment, a low-pass filter is used to perform low-pass filtering processing on the mixing signal to filter out the high-frequency signal, so as to obtain a baseband signal to be processed.
And S205, converting the baseband signal to be processed into a baseband frequency domain signal.
In this embodiment, a method of converting the baseband signal to be processed into the baseband frequency domain signal may specifically be through fourier transform or the like.
Fig. 2d is a frequency spectrum diagram corresponding to the baseband frequency domain signal obtained after the frequency mixing, the low-pass filtering and the time-frequency conversion of the time domain signal and the 10Hz signal in fig. 2 b. As shown in FIG. 2d, the three frequency values of 10Hz, 100Hz and 200Hz, which have the largest amplitude value in FIG. 2b, have been reduced to 0Hz, 90Hz and 190Hz, respectively.
And S206, subtracting the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference frequency spectrum.
In this embodiment, whether there is a collision signal in the signal to be processed is determined according to the subtraction result of the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal.
Specifically, if no collision signal exists in the signal to be processed, a subtraction result of the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal does not have a signal larger than a collision amplitude threshold; if collision signals exist in the signals to be processed, signals larger than the collision amplitude threshold exist in the subtraction result of the conjugate frequency domain signals of the baseband frequency domain signals and the baseband frequency domain signals.
Fig. 2e is a signal-corresponding difference spectrum obtained by subtracting the baseband frequency-domain signal and the conjugate frequency-domain signal in fig. 2 d. As shown in FIG. 2e, the graph includes four frequency points with amplitude values greater than the collision amplitude threshold, which are 90Hz, 190Hz, -90Hz, and-190 Hz, respectively. Thus, it can be seen that the time domain signal in fig. 2b comprises at least three different signals.
It should be further noted that, if the current noise level is low enough to be lower than the energy of all the different signals included in the signal to be processed, and the signal with the weaker signal in the difference spectrum is not completely covered by the signal with the stronger signal, the number of different signals included in the signal to be processed can be accurately determined according to the number of frequency points in the difference spectrum where the displayed amplitude value is greater than the collision amplitude threshold. Specifically, the number of frequency points in the difference spectrum, at which the amplitude value is larger than the collision amplitude threshold, divided by 2 plus 1 is the number of different signals included in the signal to be processed.
And S207, determining a collision amplitude threshold according to the current noise level.
In this embodiment, whether there is a collision signal in the signal to be processed is determined according to the comparison result of the difference spectrum and the collision amplitude threshold. Therefore, a collision amplitude threshold needs to be determined first.
In particular, if the current noise level is high, the collision amplitude threshold should be set higher. Further, energy analysis can be carried out on the difference frequency spectrum, and a collision amplitude threshold value is determined according to the analysis result and the current noise level.
And S208, judging whether a frequency point with an amplitude value larger than a collision amplitude threshold exists in the difference frequency spectrum, if so, executing a step 209, and if not, ending.
In the embodiment, whether collision signals exist in the signals to be processed is determined according to the number of frequency points of which the amplitude values are greater than the collision amplitude threshold value in the difference spectrum.
Specifically, if frequency points with amplitude values larger than the collision amplitude threshold exist in the difference frequency spectrum, collision signals exist in the signals to be processed; and if no frequency point with the amplitude value larger than the collision amplitude threshold value exists in the difference frequency spectrum, determining that no collision signal exists in the signal to be processed.
And S209, determining that the collision signal exists in the signal to be processed.
The embodiment of the invention provides a method for detecting a collision signal, which increases a method for determining a collision amplitude threshold value, embodies a method for determining a down-conversion frequency value, reduces the possibility that the frequency spectrum of a high-energy signal covers the frequency spectrum of a low-energy signal, ensures the effectiveness of a difference frequency spectrum, embodies an acquisition method of a baseband frequency domain signal, can quickly and correctly acquire the baseband frequency domain signal corresponding to a signal to be processed, embodies a method for determining whether the collision signal exists in the signal to be processed, and accurately judges the existence condition of the collision signal in the signal to be processed.
EXAMPLE III
Fig. 3 is a structural diagram of a collision signal detection device according to a third embodiment of the present invention. As shown in fig. 3, the apparatus includes: a signal receiving module 301, a baseband frequency domain signal determining module 302, and a collision signal determining module 303, wherein:
the signal receiving module 301 is configured to receive a signal to be processed, and determine a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed;
a baseband frequency domain signal determining module 302, configured to perform down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal;
the collision signal determining module 303 is configured to determine whether a collision signal exists in the signal to be processed according to the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal.
The embodiment of the invention provides a collision signal detection device, which firstly receives a signal to be processed through a signal receiving module 301, determines a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed, then performs down-conversion processing on the signal to be processed according to the down-conversion frequency value through a baseband frequency domain signal determining module 302 to obtain a baseband frequency domain signal, and finally determines whether the collision signal exists in the signal to be processed according to the baseband frequency domain signal and a conjugate frequency domain signal of the baseband frequency domain signal through a collision signal determining module 303.
The device overcomes the technical defect that important weak signals are lost because only the strongest signal is received blindly by a strongest signal selection method under the condition that whether the collision signals exist is not determined in the prior art, realizes the purpose of rapidly and accurately determining whether the double-sideband amplitude modulation communication signals comprise the collision signals, and provides effective reference information for the subsequent signal processing.
On the basis of the above embodiments, the collision signal determining module 303 may include:
a difference spectrum determining unit, configured to subtract the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference spectrum;
the frequency point determining unit is used for judging whether frequency points with amplitude values larger than a collision amplitude threshold exist in the difference frequency spectrum or not;
and the collision signal determining unit is used for determining that the collision signal exists in the signal to be processed if the frequency point with the amplitude value larger than the collision amplitude threshold exists in the difference frequency spectrum.
On the basis of the above embodiments, the method may further include:
and the collision amplitude threshold value determining unit is used for determining the collision amplitude threshold value according to the current noise level before judging whether the frequency point with the amplitude value larger than the collision amplitude threshold value exists in the difference frequency spectrum.
On the basis of the above embodiments, the signal receiving module 301 may include:
the frequency domain signal conversion unit is used for receiving the signal to be processed and converting the signal to be processed into a frequency domain signal to be processed;
and the down-conversion frequency determining unit is used for determining a frequency value corresponding to the frequency component with the maximum amplitude value in the frequency domain signal to be processed as a down-conversion frequency value.
On the basis of the foregoing embodiments, the baseband frequency domain signal determination module 302 may include:
the frequency mixing processing unit is used for carrying out frequency mixing processing on the signal to be processed according to the down-conversion frequency value to obtain a frequency mixing signal;
the filtering unit is used for carrying out low-pass filtering processing on the mixing signal by using a low-pass filter to obtain a baseband signal to be processed;
and the signal conversion unit is used for converting the baseband signal to be processed into a baseband frequency domain signal.
The collision signal detection device provided by the embodiment of the invention can be used for executing the collision signal detection method provided by any embodiment of the invention, has corresponding functional modules, and realizes the same beneficial effects.
Example four
Fig. 4 is a schematic structural diagram of a communication device according to a fourth embodiment of the present invention. Fig. 4 illustrates a block diagram of an exemplary communication device 12 suitable for use in implementing embodiments of the present invention. The communication device 12 shown in fig. 4 is only an example and should not bring any limitations to the functionality and scope of use of the embodiments of the present invention.
As shown in fig. 4, the communication device 12 is in the form of a general purpose computing device. The components of communication device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Communication device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, and commonly referred to as a "hard drive"). Although not shown in FIG. 4, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
The communication device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with the communication device 12, and/or with any devices (e.g., network card, modem, etc.) that enable the communication device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, the communication device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with the other modules of the communication device 12 via the bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with communication device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 16 executes various functional applications and data processing by executing programs stored in the system memory 28, for example, to implement the collision signal detection method provided by the embodiment of the present invention. Namely: receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed; performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal; and determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and conjugate frequency domain signals of the baseband frequency domain signals.
EXAMPLE five
The fifth embodiment of the present invention further provides a storage medium containing computer-executable instructions, which are used to execute the method for detecting a collision signal according to the fifth embodiment of the present invention when executed by a computer processor. Namely: receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed; performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal; and determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and conjugate frequency domain signals of the baseband frequency domain signals.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination 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), an 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 the context of 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.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. 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 aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like 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 a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for detecting a collision signal, applied to a double-sideband amplitude modulation communication system, is characterized by comprising the following steps:
receiving a signal to be processed, and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed;
performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal;
and determining whether collision signals exist in the signals to be processed according to the baseband frequency domain signals and conjugate frequency domain signals of the baseband frequency domain signals.
2. The method of claim 1, wherein the determining whether there is a collision signal in the signal to be processed according to the baseband frequency domain signal and a conjugate frequency domain signal of the baseband frequency domain signal comprises:
subtracting the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference frequency spectrum;
judging whether a frequency point with an amplitude value larger than a collision amplitude threshold exists in the difference frequency spectrum;
and if frequency points with amplitude values larger than the collision amplitude threshold exist in the difference frequency spectrum, determining that collision signals exist in the signals to be processed.
3. The method according to claim 2, wherein before the determining whether there is a frequency point in the difference spectrum whose magnitude value is greater than the collision magnitude threshold, further comprising:
determining the collision amplitude threshold according to the current noise level.
4. The method according to claim 1, wherein the receiving a signal to be processed and determining a down-conversion frequency value according to an amplitude value of a frequency domain signal to be processed corresponding to the signal to be processed comprises:
receiving the signal to be processed, and converting the signal to be processed into a frequency domain signal to be processed;
and determining a frequency value corresponding to the frequency component with the maximum amplitude value in the frequency domain signal to be processed as a down-conversion frequency value.
5. The method according to claim 1, wherein the down-converting the signal to be processed according to the down-converted frequency value to obtain a baseband frequency domain signal comprises:
performing frequency mixing processing on the signal to be processed according to the down-conversion frequency value to obtain a frequency mixing signal;
carrying out low-pass filtering processing on the mixing signal by using a low-pass filter to obtain a baseband signal to be processed;
and converting the baseband signal to be processed into a baseband frequency domain signal.
6. A collision signal detection device applied to a double-sideband amplitude modulation communication system is characterized by comprising:
the signal receiving module is used for receiving a signal to be processed and determining a down-conversion frequency value according to the amplitude value of the frequency domain signal to be processed corresponding to the signal to be processed;
the baseband frequency domain signal determining module is used for performing down-conversion processing on the signal to be processed according to the down-conversion frequency value to obtain a baseband frequency domain signal;
and the collision signal determining module is used for determining whether a collision signal exists in the signal to be processed according to the baseband frequency domain signal and the conjugate frequency domain signal of the baseband frequency domain signal.
7. The apparatus of claim 6, wherein the collision signal determination module comprises:
a difference spectrum determining unit, configured to subtract the conjugate frequency domain signal of the baseband frequency domain signal from the baseband frequency domain signal to obtain a difference spectrum;
the frequency point determining unit is used for judging whether a frequency point with an amplitude value larger than a collision amplitude threshold value exists in the difference frequency spectrum;
and the collision signal determination unit is used for determining that a collision signal exists in the signal to be processed if a frequency point with an amplitude value larger than a collision amplitude threshold exists in the difference frequency spectrum.
8. The apparatus of claim 7, further comprising:
and the collision amplitude threshold value determining unit is used for determining the collision amplitude threshold value according to the current noise level before judging whether the frequency point with the amplitude value larger than the collision amplitude threshold value exists in the difference frequency spectrum.
9. A communication device, characterized in that the communication device comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of collision signal detection as claimed in any one of claims 1-5.
10. A storage medium containing computer-executable instructions for performing the method of collision signal detection according to any one of claims 1-5 when executed by a computer processor.
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| CN103067969A (en) * | 2013-01-09 | 2013-04-24 | 上海交通大学 | Wireless local area network (WLAN) signal collision treatment method |
| CN105049134A (en) * | 2015-09-02 | 2015-11-11 | 电子科技大学 | Method for detecting received signal frequency collision in single channel blind separation of frequency-hopping communication |
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