CN108601045B - Standing wave detection method and device with storage function - Google Patents
Standing wave detection method and device with storage function Download PDFInfo
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Abstract
The application discloses a standing wave detection method, a device and a device with a storage function, wherein the method comprises the following steps: generating periodic positive and negative alternate standing wave detection signals, generating emission signals after superposition of baseband signals, sending the emission signals through an emission channel, receiving reflection signals generated by the emission signals in the transmission process, periodically inverting the reflection signals, accumulating the reflection signals after periodic inversion for a preset number of times, so that the signal-to-noise ratio of the reflection signals of the standing wave detection signals and the reflection signals of the baseband signals in the accumulated reflection signals is greater than a preset threshold value, and finally determining the standing wave ratio of the system by using the accumulated reflection signals. By means of the method, the signal-to-noise ratio can be improved fast, and the efficiency of standing wave detection is improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting standing waves and an apparatus having a storage function.
Background
In the existing communication system, the connection condition of the antenna feed system is mainly judged through standing wave detection, so that the normal connection of a channel from a base station to an air interface is ensured, and the good connection can effectively radiate energy out of an antenna port. FDR (Frequency Domain Reflectometer) technology is a commonly used online standing wave detection method. However, the existing FDR standing wave detection method is only suitable for broadband signals, and for narrowband signals, the existing FDR standing wave detection method is slow in signal-to-noise ratio improvement speed and low in standing wave detection efficiency.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a standing wave detection method and device and a device with a storage function, and the problem that the signal-to-noise ratio of the existing FDR standing wave detection method is slow in speed can be solved.
In order to solve the technical problem, the application adopts a technical scheme that: provided is a standing wave detection method including: generating a standing wave detection signal, wherein the standing wave detection signal comprises a positive periodic signal and a negative periodic signal which are alternated; transmitting a transmission signal through a transmission channel, wherein the transmission signal comprises a standing wave detection signal and a baseband signal; receiving a reflected signal generated in the transmission process of the transmitted signal; periodically inverting the reflected signal; accumulating the periodically inverted reflection signals for a preset number of times so that the signal-to-noise ratio of the reflection signals of the standing wave detection signals and the reflection signals of the baseband signals in the accumulated reflection signals is greater than a preset threshold value; and determining the standing wave ratio of the system by using the accumulated reflected signals.
In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a standing wave detection device including: a signal generator for generating a standing wave detection signal including a positive and negative alternate periodic signal; the transmitting circuit is connected with the signal generator and is used for transmitting a transmitting signal through the transmitting channel, wherein the transmitting signal comprises a standing wave detection signal and a baseband signal; the reflection receiving circuit is connected with the transmitting circuit and used for receiving a reflection signal generated in the transmission process of the transmitting signal; and the signal processing circuit is connected with the reflection receiving circuit and is used for periodically inverting the reflection signal and accumulating the periodically inverted reflection signal for a preset number of times so that the signal-to-noise ratio of the reflection signal of the standing wave detection signal and the reflection signal of the baseband signal in the accumulated reflection signal is greater than a preset threshold value and the system standing wave ratio is determined by using the accumulated reflection signal.
In order to solve the above technical problem, the present application adopts another technical solution: there is provided an apparatus having a storage function, storing instructions, wherein the instructions, when executed, implement the method as described above.
The beneficial effect of this application is: different from the prior art, in some embodiments of the present application, a periodic positive-negative alternating standing wave detection signal is generated, a baseband signal is superimposed to generate a transmission signal, the transmission signal is transmitted through a transmission channel, a reflection signal generated by the transmission signal in a transmission process is received, the reflection signal is periodically inverted, the reflection signal after periodic inversion is accumulated for a preset number of times, so that a signal-to-noise ratio of the reflection signal of the standing wave detection signal and the reflection signal of the baseband signal in the accumulated reflection signal is greater than a preset threshold, and finally, the accumulated reflection signal is used to determine a system standing wave ratio. In this way, this application is with reflection signal periodic inversion for after standing wave detected signal superposes many times in the reflection signal after the reversal, its power acceleration rate is greater than the power acceleration rate of baseband signal, thereby can make the SNR promote very fast, improve the efficiency that the standing wave detected.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the standing wave detection method of the present application;
FIG. 2 is a schematic waveform diagram of a standing wave detection signal;
FIG. 3 is a detailed flowchart of step S14 in FIG. 1;
FIG. 4 is a schematic diagram of waveforms before and after inversion of the standing wave detection signal and the baseband signal in the reflected signal;
FIG. 5 is a detailed flowchart of step S16 in FIG. 1;
FIG. 6 is a schematic flow chart of a second embodiment of the standing wave detection method of the present application;
FIG. 7 is a schematic flow chart of a third embodiment of the standing wave detection method of the present application;
FIG. 8 is a schematic structural diagram of a standing wave detection apparatus according to a first embodiment of the present application;
FIG. 9 is a schematic diagram of an embodiment of the standing wave detection apparatus of the present application;
FIG. 10 is a schematic structural diagram of a standing wave detection apparatus according to a second embodiment of the present application;
FIG. 11 is a schematic structural diagram of a third embodiment of the standing wave detection apparatus of the present application;
FIG. 12 is a schematic structural diagram of an embodiment of the apparatus with storage function according to the present application.
Detailed Description
The technical solutions in 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 obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the first embodiment of the standing wave detection method of the present application includes:
s11: generating a standing wave detection signal;
wherein the standing wave detection signal comprises a periodic signal with alternating positive and negative. The positive and negative alternate periodic signal means that the amplitude of the signal in one period is positive and negative alternate, the duration of the positive amplitude and the negative amplitude can be the same or different, the specific period can be set according to the actual situation, and the specific period is not limited specifically here.
Specifically, in one application example, as shown in fig. 2, the period of the generated standing wave detection signal is 2T, wherein the signals in one T time are positive amplitudes a1 and a2 … … a512, and the signals in the other T time are negative amplitudes-a 1, -a2 … … -a 512.
S12: transmitting a transmission signal through a transmission channel, wherein the transmission signal comprises a standing wave detection signal and a baseband signal;
the baseband signal may be a narrowband signal or a wideband signal, and is not limited herein. The embodiments of the present application are described taking narrowband signals as examples.
Specifically, in an application example, the standing wave detection signal and the baseband signal may be superimposed by an adder to obtain the transmission signal, and then the transmission signal may be sent out through the transmission channel. The transmitting channel includes, but is not limited to, signal processing devices such as a DPD (Digital Pre-Distortion) circuit, a DAC, etc., and transmitting devices such as a transmitter TX, a duplexer DUP, an antenna, etc.
Optionally, when the standing wave detection is performed, before the transmission signal is sent, the functions of DPD, power control, and the like, which may affect the channel state of the system, need to be suspended, so as to avoid affecting the accuracy of the standing wave detection due to the change of the channel state of the system.
S13: receiving a reflected signal generated in the transmission process of the transmitted signal;
wherein the reflected signal comprises a reflected signal of the baseband signal and a reflected signal of the standing wave detection signal.
Specifically, the receiving end of the reflected signal is a reflected signal receiving point at a position before the transmission signal is transmitted to the antenna, for example, a position between the transmitter TX and the duplexer DUP, and the reflected signal can be received and analog-to-digital converted.
S14: periodically inverting the reflected signal;
wherein, periodically inverting the signal means changing the amplitude of the signal from positive to negative or from negative to positive. The inversion period and inversion duration of the reflected signal are related to the period and positive and negative amplitude durations of the standing wave detection signal. The inversion period may be the same as the period of the standing wave detection signal, and the inversion duration may be the same as the duration of the positive or negative amplitude of the standing wave detection signal.
Alternatively, as shown in fig. 3, step S14 includes:
s141: periodically inverting at least part of a negative signal of a reflected signal of the standing wave detection signal into a positive signal.
S142: and periodically inverting at least part of positive signals of the reflected signals of the baseband signals in the reflected signals into negative signals so as to enable the reflected signals of the baseband signals in the accumulated reflected signals to at least partially cancel each other.
Specifically, in one application example, as shown in fig. 4, the reflected signal includes a reflected signal a1 of the standing wave detection signal and a reflected signal B1 of the baseband signal, before inversion, waveform diagrams of the a1 signal and the B1 signal are shown in fig. 4(a) and 4(B), respectively, the inversion period is set to the period 2T of the standing wave detection signal, the inversion duration is set to T, the inversion start point is set to (2n +1) time T, where n is an integer, waveforms of the A2 signal and the B2 signal after inversion of the A1 signal and the B1 signal are shown in FIGS. 4(c) and 4(d), respectively, thereby reversing the negative amplitude portion of the a1 signal to a positive amplitude, reversing the positive amplitude portion of the B2 signal to a negative amplitude, i.e., inverted such that the a2 signal amplitude is mostly one of positive and negative amplitude, and the B2 signal is alternating positive and negative with substantially the same duration of positive and negative amplitude. Of course, in other application examples, the positive amplitude of the a1 signal may be partially inverted to negative amplitude, and the negative amplitude of the B1 signal may be partially inverted to positive amplitude.
S15: accumulating the periodically inverted reflection signals for a preset number of times so that the signal-to-noise ratio of the reflection signals of the standing wave detection signals and the reflection signals of the baseband signals in the accumulated reflection signals is greater than a preset threshold value;
the preset number is an accumulated number preset according to the signal-to-noise ratio of the standing wave detection, for example, 200 times. The preset threshold is a signal-to-noise ratio threshold set according to the standing wave detection requirement of the antenna feed system, such as 50dB or 60 dB.
Specifically, in an application example, the reflection signal includes a reflection signal of the standing wave detection signal and a reflection signal of the baseband signal, and when the inverted reflection signal is subjected to segment accumulation for a preset number of times, the reflection signal of the standing wave detection signal and the reflection signal of the baseband signal are considered to be subjected to segment accumulation respectively. For example, the reflected signal a2 signal of the standing wave detection signal and the reflected signal B2 signal of the baseband signal in fig. 4(c) and 4(d) are divided into a plurality of segments, for example, one segment is a half period of the B2 signal, i.e., the a2 signal and the B2 signal are divided into a plurality of segments of 0-T, T-2T … …, and then N +1 segments are added, i.e., the reflected signals are added N times. Because the A2 signals in the reversed reflected signal are all positive signals, after accumulating for N times, the amplitude is increased by N times, and the power is increased by N times2And when the B2 signal is a positive and negative alternative signal, the amplitude of the signal is 0 after accumulating N times when N is an odd number, namely the signals are mutually cancelled, and the amplitude of the signal is unchanged after accumulating N times when N is an even number. Therefore, the ratio of the power of the reflected signal a2 of the standing wave detection signal to the power of the reflected signal B2 of the baseband signal in the reflected signal is increased, and finally, the ratio, i.e., the signal-to-noise ratio of the reflected signal of the standing wave detection signal to the reflected signal of the baseband signal after accumulation, is greater than a predetermined threshold (e.g., 50 dB).
In this embodiment, since the baseband signal is a narrowband signal, the data change rate of the narrowband signal is low, and the correlation is strong in a long period of time, and the reflected signals of the narrowband signal can be cancelled out by performing reverse accumulation for multiple times by using the above method. In other embodiments, the baseband signal may also be a wideband signal, where the data in the wideband signal are uncorrelated, and the reflected signal of the wideband signal is not cancelled after being reversely accumulated for multiple times by the above method, but the power increase amplitude is slower and smaller than the increase amplitude of the reflected signal of the standing wave detection signal.
S16: and determining the standing wave ratio of the system by using the accumulated reflected signals.
Wherein the system standing wave ratio is the standing wave ratio of the antenna feed system. Because the signal-to-noise ratio of the reflected signal of the standing wave detection signal in the accumulated reflected signal and the reflected signal of the baseband signal is faster than a preset threshold value, that is, the baseband signal can be basically ignored, at this time, the system standing-wave ratio can be determined by using the accumulated reflected signal.
Alternatively, as shown in fig. 5, step S16 includes:
s161: calculating a channel response of the system by using the accumulated reflected signals;
the channel response of the system may be a time domain response or a frequency domain response, and is not limited in this respect. The channel response of the system is the response of the channel from the transmission of the standing wave detection signal to the accumulation of the reflected signal.
S162: and comparing the channel response with the initial channel response to determine the system standing wave ratio.
The initial channel response is a channel response obtained by a pre-test when the system is open, namely the initial channel response obtained by the pre-test when the antenna feeder system is not initially connected with the antenna. The initial channel response may also be a time domain response or a frequency domain response.
Specifically, in an application example, the channel response, for example, a time domain response, of the system may be calculated by using the accumulated reflection signal and the initially generated standing wave detection signal, then a peak value of the time domain response of the system and a peak value of the initial channel time domain response are obtained, a peak value ratio of the two is calculated, and finally, the peak value ratio is the standing wave ratio of the system. Of course, in other application examples, the standing wave ratio of the system can also be determined through the frequency domain response.
The following can be simulated by using the standing wave detection method of the present application. Wherein, the input baseband signal is Tetra 5kbps IQ data, and 512-point accumulation simulation is carried out on 184.32 Mbps.
And (3) simulation results: if the baseband signals are directly accumulated in 512 segments, the total output power is 245 times of the source signals after 192 times of accumulation. If 512 sections are used first, the baseband signal is reversely accumulated, and after 192 times of final accumulation, the total output power is 0.45 times of the original signal. That is, the baseband power can be reduced by a factor of 245/0.45 to 544 when compared to the reverse segment accumulation, and the accumulation time can be reduced by a factor of 544 for the same snr requirement.
In this embodiment, the reflection signal is periodically inverted, so that after standing wave detection signals in the inverted reflection signal are superposed for multiple times, the power acceleration rate of the reflected signal is greater than that of the baseband signal, and thus the signal-to-noise ratio can be increased quickly, and the efficiency of standing wave detection can be improved.
As shown in fig. 6, the second embodiment of the standing wave detection method of the present application is based on the first embodiment of the standing wave detection method of the present application, and steps S161 and S162 further include:
s1611: respectively carrying out fast Fourier transform on the accumulated reflection signals and the standing wave detection signals to respectively obtain frequency domain signals of the accumulated reflection signals and frequency domain signals of the standing wave detection signals;
s1612: calculating the channel frequency response of the system by using the frequency domain signal of the accumulated reflection signal and the frequency domain signal of the standing wave detection signal;
s1613: performing inverse fast Fourier transform on the channel frequency response to obtain a channel time domain response of the system;
s1621: and comparing the peak value of the channel time domain response of the system with the peak value of the initial channel time domain response to obtain the system standing-wave ratio.
Specifically, in the accumulated reflected signal, the signal-to-noise ratio between the reflected signal of the standing wave detection signal and the reflected signal of the baseband signal is faster than a preset threshold, that is, the baseband signal is substantially negligible, and at this time, the accumulated reflected signal can be regarded as the reflected signal of the accumulated standing wave detection signal and is recorded as the y signal. The initially transmitted standing wave detection signal may be denoted as an x signal, the accumulated reflection signal y and standing wave detection signal x are subjected to fast fourier transform, respectively, a frequency domain signal fft (y) of the accumulated reflection signal and a frequency domain signal fft (x) of the standing wave detection signal may be obtained, a ratio fft (y)/fft (x) of the frequency domain signal fft (y) of the accumulated reflection signal and the frequency domain signal fft (x) of the standing wave detection signal may be calculated, a channel frequency response H of the system may be obtained, and then the channel frequency domain response H is subjected to inverse fast fourier transform ifft (H), so that a channel time domain response f (t) ifft (H) of the system may be obtained. After the peak value of the channel time domain response F (t) of the system and the peak value of the initial channel time delay response are obtained, the peak values are compared, and then the standing-wave ratio of the system can be obtained.
In other embodiments, the reflected signal may be subjected to time delay alignment before being periodically inverted, so that an inversion starting point is close to a transition point of positive and negative amplitudes of the reflected signal of the standing wave detection signal in the reflected signal, and further, an influence of channel time delay on subsequent accumulation may be reduced.
Specifically, as shown in fig. 7, the third embodiment of the standing wave detection method of the present application is based on the first embodiment of the standing wave detection method of the present application, and before step S14, the third embodiment further includes:
s21: calculating the time delay of the reflected signal;
when the reflection signal is received by the reflection signal receiving point due to a time delay of the transmission channel, the reflection signal which may not be the first data transmitted, for example, the first data transmitted by the standing wave detection signal a1 in fig. 4(a) is a1, and the first data of the reflection signal a2 of the standing wave detection signal in the received reflection signal is not a1, and may be a5 or a10, etc. At this time, in order to make the amplitude of the reflected signal a2 of the standing wave detection signal be mostly positive or negative when the subsequent reflected signal is periodically inverted, the time delay of the reflected signal needs to be obtained for time delay alignment.
Specifically, in an application example, the time difference corresponding to the data with the same amplitude in the next period of the received first data may be obtained by periodically comparing the received reflected signals, and the time delay of the reflected signal may be obtained by subtracting the period of the reflected signal from the time difference. In addition, a signal obtained after a known signal passes through the transmission channel may be used in advance, and compared with the initially transmitted known signal, so as to obtain the time delay of the transmission channel, which is used as the time delay of the reflected signal. Of course, other time delay calculation methods may also be adopted, for example, formula calculation and the like are adopted, and the method is not limited in detail here.
S22: and time delay alignment is carried out on the reflection signals, so that each periodic inversion starting point of the reflection signals after time delay alignment is close to the starting point of the negative amplitude in the reflection signals of the standing wave detection signals.
Specifically, in an application example, after the time delay of the reflection signal is obtained, the reflection signal may be subjected to time delay alignment, for example, the reflection signal is delayed backward by the obtained time delay, and after the time delay alignment, when periodic inversion is subsequently performed, an inversion starting point of each period may coincide with a starting point of a negative amplitude of each period in the reflection signal of the standing wave detection signal. However, the delay data may have an error, and the reflected signals obtained after the delay alignment are subjected to periodic inversion, when the reflected signals of each period are aligned, the inversion starting point of each period is close to the starting point of the negative amplitude of each period in the reflected signals of the standing wave detection signal, that is, they do not coincide, for example, the inversion starting point after the delay alignment of the reflected signals of the standing wave detection signal in fig. 4(e) is-a 2 instead of-a 1, at this time, as long as the error does not exceed the allowable range (for example, 1/5 periods), the reflected signal periodicity characteristic of the standing wave detection signal still exists in the reflected signals after the periodic inversion, for example, after the reflected signals of the standing wave detection signal in fig. 4(f) are inverted, the periodicity still exists, only the period is changed to T, and the purpose of increasing the signal-to-noise ratio can still be. Therefore, the purpose of improving the signal-to-noise ratio can be achieved by adopting simpler time delay alignment, and meanwhile, the calculation complexity of the system is not excessively increased.
As shown in fig. 8, a first embodiment 30 of the standing wave detection apparatus of the present application includes:
a signal generator 301 for generating a standing wave detection signal including a positive and negative alternate periodic signal;
a transmitting circuit 302 connected to the signal generator 301 for transmitting a transmitting signal through the transmitting channel, wherein the transmitting signal includes a standing wave detection signal and a baseband signal;
a reflection receiving circuit 303 connected to the transmitting circuit 302 for receiving a reflection signal generated by the transmitting signal during transmission;
the signal processing circuit 304 is connected to the reflection receiving circuit 303, and is configured to periodically invert the reflection signal, and further configured to accumulate the periodically inverted reflection signal for a preset number of times, so that a signal-to-noise ratio between a reflection signal of the standing wave detection signal and a reflection signal of the baseband signal in the accumulated reflection signal is greater than a preset threshold, and determine a system standing-wave ratio by using the accumulated reflection signal and using a frequency domain reflection method.
Optionally, the signal processing circuit 304 further comprises:
the signal inversion circuit 3041 inverts at least part of the negative amplitude of the reflected signal of the standing wave detection signal to a positive amplitude.
The signal inverting circuit 3041 is further configured to invert at least a part of positive amplitudes of the reflected signals of the baseband signals in the reflected signals into negative amplitudes, so that the reflected signals of the baseband signals in the accumulated reflected signals at least partially cancel each other.
Specifically, in an application example, as shown in fig. 9, the standing wave detection apparatus 30 may further include a transmission channel including, but not limited to, a digital predistortion DPD, a digital-to-analog converter DAC, a transmitter TX, a duplexer DUP, an antenna, and a load, and a Feedback channel including, but not limited to, a reflection receiver Feedback RX, an analog-to-digital converter ADC, an accumulator AAC, a fast fourier transform circuit FFT, a standing wave ratio calculation circuit, and the like. The signal generator 301 may also generate a baseband signal, and the standing wave detection signal may also be data directly stored in a Memory (e.g., a Random-Access Memory (RAM)), and the data is only required to be directly superimposed on the baseband signal by an adder for transmission.
Further referring to fig. 9, when the standing wave detection data is superimposed on the baseband signal, the Gain/power Control may be performed on the standing wave detection signal, and the signal processing circuit 304 may also be a signal processing chip directly, or may be integrated with the signal inverting circuit 3041, the AAC circuit, the FFT circuit, and the standing-wave ratio calculating circuit.
In this embodiment, the content of any one of the first to third embodiments of the present application may be referred to for the specific function implementation process of the above-mentioned components, and will not be repeated here.
As shown in fig. 10, a second embodiment 40 of the standing wave detection device of the present application is similar in structure to the first embodiment of the standing wave detection device of the present application, except that the standing wave detection device 40 of the present embodiment further includes: and a delay alignment circuit 305, coupled between the reflection receiving circuit 303 and the signal processing circuit 304, for calculating a delay of the reflection signal, and performing delay alignment on the reflection signal, so that each periodic inversion starting point of the delay-aligned reflection signal is close to a starting point of a negative amplitude in the reflection signal of the standing wave detection signal.
In this embodiment, the specific processes of calculating the delay of the reflected signal and aligning the delay of the reflected signal by the delay alignment circuit 305 may refer to the method provided in the third embodiment of the standing wave detection method of the present application, and are not repeated here.
As shown in fig. 11, the third embodiment 50 of the standing wave detection device of the present application is similar to the first embodiment of the standing wave detection device of the present application, except that in the standing wave detection device 50 of the present embodiment, the signal processing circuit 304 further includes:
a channel response calculation circuit 3042 for calculating a channel response of the system using the accumulated reflected signals;
a standing-wave ratio calculating circuit 3043, connected to the channel response calculating circuit 3042, configured to compare the channel response of the system with the initial channel response, and determine a system standing-wave ratio.
Optionally, the channel response calculating circuit 3042 is further configured to perform fast fourier transform on the accumulated reflected signal and standing wave detection signal, respectively, calculate a channel frequency response of the system using the obtained frequency domain signal of the accumulated reflected signal and the obtained frequency domain signal of the standing wave detection signal, and perform inverse fast fourier transform on the channel frequency response to obtain a time domain response of a channel of the system;
the standing-wave ratio calculating circuit 3043 is specifically configured to compare a peak value of a channel time domain response of the system with a peak value of an initial channel time domain response, so as to obtain a system standing-wave ratio.
In this embodiment, the specific process of calculating the system standing wave ratio by the channel response calculating circuit 3042 and the standing wave ratio calculating circuit 3043 may refer to the methods provided in the first and second embodiments of the standing wave detection method of the present application, and will not be repeated here.
In this embodiment, the standing wave detection apparatus may further include a delay alignment circuit, where the delay alignment circuit connects the reflection receiving circuit and the signal processing circuit, and a specific operation process of the delay alignment circuit may refer to the method provided in the third embodiment of the standing wave detection method of the present application, and will not be repeated here.
As shown in fig. 12, in an embodiment of the apparatus with storage function of the present application, the apparatus with storage function 60 stores instructions 601, which when executed implement the method provided in any one of the first to third embodiments of the standing wave detection method of the present application or their non-conflicting combinations.
The device 60 with a storage function may be a portable storage medium such as a usb disk and an optical disk, or may be a base station, a server, or a separate component which can be integrated in the base station, such as a control chip.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (11)
1. A method of standing wave detection, comprising:
generating a standing wave detection signal, wherein the standing wave detection signal comprises a positive and negative alternative periodic signal;
transmitting a transmission signal through a transmission channel, wherein the transmission signal comprises the standing wave detection signal and a baseband signal;
receiving a reflected signal generated in the transmission process of the transmitting signal;
periodically inverting the reflected signal;
accumulating the periodically inverted reflection signals for a preset number of times so that the signal-to-noise ratio of the reflection signals of the standing wave detection signals and the reflection signals of the baseband signals in the accumulated reflection signals is greater than a preset threshold;
determining a system standing wave ratio by using the accumulated reflected signals;
wherein the determining a system standing wave ratio using the accumulated reflected signals comprises:
calculating a channel response of the system using the accumulated reflected signals;
comparing the channel response with an initial channel response to determine the system standing wave ratio;
wherein the channel response comprises a channel time domain response or a channel frequency domain response, and the initial channel response comprises an initial channel time domain response or an initial channel frequency domain response;
the calculating the channel response of the system by using the accumulated reflected signals comprises: calculating a channel time domain response or a channel frequency domain response of the system by using the accumulated reflection signals;
the comparing the channel response with the initial channel response to determine the system standing wave ratio comprises: and comparing the channel time domain response with the initial channel time domain response, or comparing the channel frequency domain response with the initial channel frequency domain response to determine the system standing-wave ratio.
2. The method of claim 1, wherein periodically inverting the reflected signal comprises:
periodically inverting at least a portion of negative amplitudes of a reflected signal of the standing wave detection signal to positive amplitudes.
3. The method of claim 2, wherein periodically inverting the reflected signal further comprises:
periodically inverting at least part of positive amplitudes of reflected signals of the baseband signals in the reflected signals to negative amplitudes so that the reflected signals of the baseband signals in the reflected signals at least partially cancel each other after accumulation.
4. The method of any of claims 1 to 3, wherein prior to periodically inverting the reflected signal, further comprising:
calculating the time delay of the reflected signal;
and performing time delay alignment on the reflection signals, so that each periodic inversion starting point of the reflection signals after time delay alignment is close to the starting point of the negative amplitude value in the reflection signals of the standing wave detection signals.
5. The method of claim 1,
calculating a channel time domain response of a system using the accumulated reflected signals, comprising:
respectively performing fast Fourier transform on the accumulated reflection signal and the standing wave detection signal to respectively obtain a frequency domain signal of the accumulated reflection signal and a frequency domain signal of the standing wave detection signal;
calculating the channel frequency response of the system by using the frequency domain signal of the accumulated reflection signal and the frequency domain signal of the standing wave detection signal;
performing inverse fast Fourier transform on the channel frequency response to obtain a channel time domain response of the system;
the comparing the channel time domain response with the initial channel time domain response and the determining the system standing wave ratio comprises:
and comparing the peak value of the channel time domain response of the system with the peak value of the initial channel time domain response to obtain the system standing-wave ratio.
6. A standing wave detection device, comprising:
a signal generator for generating a standing wave detection signal comprising a positive and negative alternating periodic signal;
a transmitting circuit connected to the signal generator for transmitting a transmitting signal through a transmitting channel, wherein the transmitting signal includes the standing wave detection signal and a baseband signal;
the reflection receiving circuit is connected with the transmitting circuit and is used for receiving a reflection signal generated in the transmission process of the transmission signal;
the signal processing circuit is connected with the reflection receiving circuit, is used for periodically inverting the reflection signal, and is also used for accumulating the periodically inverted reflection signal for a preset number of times, so that the signal-to-noise ratio of the reflection signal of the standing wave detection signal and the reflection signal of the baseband signal in the accumulated reflection signal is greater than a preset threshold value, and the accumulated reflection signal is used for determining the system standing-wave ratio;
wherein the signal processing circuit further comprises:
a channel response calculation circuit for calculating a channel response of the system using the accumulated reflected signals;
the standing-wave ratio calculation circuit is connected with the channel response calculation circuit and used for comparing the channel response with the initial channel response to determine the system standing-wave ratio;
wherein the channel response comprises a channel time domain response or a channel frequency domain response, and the initial channel response comprises an initial channel time domain response or an initial channel frequency domain response;
the channel response calculating circuit is used for calculating the channel response of the system by using the accumulated reflected signals, and comprises the following steps: the channel response calculating circuit is used for calculating the channel time domain response or the channel frequency domain response of the system by using the accumulated reflected signals;
the standing-wave ratio calculating circuit is connected with the channel response calculating circuit and used for comparing the channel response with an initial channel response and determining the system standing-wave ratio, and comprises: and comparing the channel time domain response with the initial channel time domain response or comparing the channel frequency domain response with the initial channel frequency domain response to determine the system standing-wave ratio.
7. The apparatus of claim 6, wherein the signal processing circuit further comprises:
and the signal inversion circuit is used for periodically inverting at least part of negative amplitudes of the reflected signals of the standing wave detection signals into positive amplitudes.
8. The apparatus of claim 7, wherein the signal inverting circuit is further configured to periodically invert at least some of the positive amplitudes of the reflected signals of the baseband signals in the reflected signals to negative amplitudes, so that the reflected signals of the baseband signals in the reflected signals at least partially cancel each other after the accumulation.
9. The apparatus of any one of claims 6 to 8, further comprising: and the time delay alignment circuit is coupled between the reflection receiving circuit and the signal processing circuit and used for calculating the time delay of the reflection signal and performing time delay alignment on the reflection signal so that each periodic inversion starting point of the reflection signal after time delay alignment is close to the starting point of the negative amplitude value in the reflection signal of the standing wave detection signal.
10. The apparatus of claim 6,
the channel response calculation circuit is further configured to perform fast fourier transform on the accumulated reflection signal and the standing wave detection signal, calculate a channel frequency response of the system using the obtained frequency domain signal of the accumulated reflection signal and the obtained frequency domain signal of the standing wave detection signal, and perform inverse fast fourier transform on the channel frequency response to obtain a channel time domain response of the system;
the standing-wave ratio calculating circuit is further used for comparing the peak value of the channel time domain response of the system with the peak value of the initial channel time domain response to obtain the standing-wave ratio of the system.
11. An apparatus having storage functionality for wireless communications, the apparatus having instructions stored thereon which are executable by a processor to implement the method of any one of claims 1-5.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958756A (en) * | 2010-02-11 | 2011-01-26 | 华为技术有限公司 | Standing wave detection method, standing wave detection device and base station |
| WO2011098021A1 (en) * | 2010-02-11 | 2011-08-18 | 华为技术有限公司 | Standing wave detection method, standing wave detection device and base station thereof |
| CN102325339A (en) * | 2011-07-22 | 2012-01-18 | 京信通信系统（中国）有限公司 | Standing wave detection method and device and radio remote unit |
| CN102511139A (en) * | 2011-11-28 | 2012-06-20 | 华为技术有限公司 | Standing wave detection method and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101958756A (en) * | 2010-02-11 | 2011-01-26 | 华为技术有限公司 | Standing wave detection method, standing wave detection device and base station |
| WO2011098021A1 (en) * | 2010-02-11 | 2011-08-18 | 华为技术有限公司 | Standing wave detection method, standing wave detection device and base station thereof |
| CN102325339A (en) * | 2011-07-22 | 2012-01-18 | 京信通信系统（中国）有限公司 | Standing wave detection method and device and radio remote unit |
| CN102511139A (en) * | 2011-11-28 | 2012-06-20 | 华为技术有限公司 | Standing wave detection method and device thereof |
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