CN111147418A - Signal peak-to-average ratio reduction method, device, equipment and storage medium - Google Patents
Signal peak-to-average ratio reduction method, device, equipment and storage medium Download PDFInfo
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Abstract
The application relates to a signal peak-to-average power ratio reduction method, a signal peak-to-average power ratio reduction device, a signal peak-to-average power ratio reduction equipment and a signal peak-to-average power ratio reduction storage medium. The signal peak-to-average power ratio reduction method ensures that the peak value and the phase characteristic of each sampling point of the input signal are monitored in real time by calculating the envelope and the phase of the input signal; the input signal is subjected to peak clipping processing based on the envelope value of the signal and a preset peak clipping threshold, and the signal subjected to peak clipping processing is further subjected to phase restoration according to the phase characteristics, so that the original phase characteristics are reserved, and the frequency spectrum regeneration is effectively prevented. Based on the method, the stability of the maximum peak value of the rear-end output signal can be ensured, and the performance stability of the system is improved; and meanwhile, the working robustness of the system is ensured, and the design complexity of the back-end amplifier is reduced. The method and the device for peak clipping can generate a peak clipping effect aiming at any signal system, relieve the pressure of a power amplifier at the rear end of the equipment, and reduce the complexity and cost for realizing the reduction of the peak-to-average ratio.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for reducing a signal peak-to-average power ratio.
Background
At present, the peak-to-average ratio of signals of the advanced modulation mode in a wireless communication system is high, and in order to ensure that the signals are not distorted, power amplification backing needs to be carried out, so that the power amplification efficiency is reduced. To address this problem, crest factor reduction techniques are applied. The algorithms for reducing the signal Peak-to-average power ratio comprise an algorithm for performing phase rotation according to a time domain frame format of a specific standard signal, a Peak-Cancel algorithm and the like.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional algorithm for reducing the peak-to-average power ratio of the signal needs to be configured correspondingly according to the system of the signal, and the complexity of algorithm implementation is high.
Disclosure of Invention
Based on this, it is necessary to provide a signal peak-to-average ratio reduction method, apparatus, device and storage medium for solving the problem of high implementation complexity of the conventional algorithm for reducing the signal peak-to-average ratio.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a signal peak-to-average ratio reduction method, including:
and carrying out envelope calculation on the input signal to obtain an envelope value of the signal.
And carrying out phase calculation on the input signal to obtain a phase value of the signal.
And carrying out peak clipping on the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal.
And carrying out phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal.
And outputting the signal based on the second peak clipping signal.
In one embodiment, the step of performing peak clipping on a portion of the envelope value of the signal exceeding a peak clipping threshold to obtain a first peak clipping signal includes:
and detecting whether the envelope value of the signal has a part exceeding the peak clipping threshold, and if so, reducing the part exceeding the peak clipping threshold to the peak clipping threshold.
In one embodiment, the step of performing phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal includes:
and acquiring a peak clipping point of the first peak clipping signal, and carrying out phase reduction on the peak clipping point according to the phase value.
In one embodiment, before the step of performing envelope calculation on the input signal to obtain an envelope value of the signal, the method further includes:
and performing down-conversion and analog-to-digital conversion processing on the signal received by the first antenna to obtain a baseband receiving signal.
And carrying out digital intermediate frequency processing on the baseband receiving signal to obtain an input signal.
In one embodiment, the step of outputting the signal based on the second peak clipping signal comprises:
and performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal.
In one embodiment, after the step of performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain the baseband output signal, the method further includes:
and amplifying the baseband output signal and outputting the amplified signal.
In one embodiment, the step of performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal includes:
and filtering the second peak clipping signal, and performing digital-to-analog conversion and up-conversion processing on the filtered signal.
On the other hand, the embodiment of the present application further provides a signal peak-to-average power ratio reduction apparatus, including:
and the envelope calculation module is used for carrying out envelope calculation on the input signal to obtain an envelope value of the signal.
And the phase calculation module is used for performing phase calculation on the input signal to obtain a phase value of the signal.
And the peak clipping module is used for carrying out peak clipping on the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal.
And the phase reduction module is used for carrying out phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal.
And the signal output module is used for outputting signals based on the second peak clipping signal.
In one embodiment, there is provided an apparatus comprising:
a first antenna for acquiring an input signal.
And the second antenna is used for outputting signals.
A processing module for implementing the signal peak-to-average ratio reduction method; the processing module is respectively connected with the first antenna and the second antenna.
In one embodiment, a computer storage medium is provided, on which a computer program is stored, which when executed by a processor implements the signal peak-to-average ratio reduction method as described above.
One of the above technical solutions has the following advantages and beneficial effects:
calculating the envelope and the phase of the input signal to ensure that the peak value and the phase characteristic of each sampling point of the input signal are monitored in real time; the input signal is subjected to peak clipping processing based on the envelope value of the signal and a preset peak clipping threshold, and the signal subjected to peak clipping processing is further subjected to phase restoration according to the phase characteristics, so that the original phase characteristics are reserved, and the frequency spectrum regeneration is effectively prevented. Based on the method, the stability of the maximum peak value of the rear-end output signal can be ensured, and the performance stability of the system is improved; and meanwhile, the working robustness of the system is ensured, and the design complexity of the back-end amplifier is reduced. The method and the device for peak clipping can generate a peak clipping effect aiming at any signal system, relieve the pressure of a power amplifier at the rear end of the equipment, and reduce the complexity and cost for realizing the reduction of the peak-to-average ratio.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a first schematic flow chart diagram of a method for signal peak-to-average ratio reduction in one embodiment;
FIG. 2 is a schematic diagram of peak clipping of a signal peak-to-average power ratio reduction method in one embodiment;
FIG. 3 is a second schematic flow chart diagram of a method for signal peak-to-average ratio reduction in one embodiment;
FIG. 4 is a third schematic flow chart diagram of a method for signal peak-to-average ratio reduction in one embodiment;
FIG. 5 is a fourth schematic flow chart diagram illustrating a method for signal peak-to-average power ratio reduction in one embodiment;
FIG. 6 is a schematic diagram of an exemplary signal peak-to-average power ratio reduction apparatus;
fig. 7 is a schematic structural diagram of an apparatus in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
At present, the algorithm for reducing the peak-to-average ratio of a signal mainly comprises the following methods:
1. according to the time domain frame format of the specific standard signal, the phase rotation is carried out under the condition that the multi-carrier combination exists, and the reduction of the peak-to-average ratio value of the multi-carrier signal is realized. The technology is only suitable for a communication system which adopts a time slot structure and has a training sequence, and the application range is narrow.
2. The Peak-Cancel algorithm uses the impulse response of the same filter as the input signal spectrum mask to generate the Peak-clipping pulse. That is, if the spectrum normalization bandwidth of the input signal is 1/n, the spectrum normalization bandwidth of the corresponding filter should also be 1/n, so as to avoid introducing out-of-band noise during peak clipping. The peak clipping is carried out on the points exceeding the power threshold value in the original signal, the algorithm needs to modify the peak clipping pulse according to the frequency spectrum characteristics of different systems to achieve the purpose of reducing the peak-to-average ratio, and the defects of high algorithm complexity and high implementation cost exist.
Techniques and algorithms for reducing the crest factor have become a fundamental means of high performance communication devices. Related art for reducing crest factor is disclosed in the prior art, but there are problems in the prior art that the algorithm complexity is large, the implementation cost is high, or a specific system is required. Therefore, how to implement peak clipping by a specific algorithm in a peak cancellation system is an urgent problem to be solved, and the peak cancellation system is insensitive to signal systems, low in implementation cost, and capable of ensuring the quality of signals to the greatest extent.
Therefore, the embodiment of the application provides a method capable of reducing the peak-to-average ratio of a signal, which is applicable to generalized peak clipping operations of various signal systems and mainly relates to three optimization operations of amplitude comparison calculation, phase calculation and phase restoration; by operating the amplitude and the phase of the signal, the peak-to-average ratio of the signal is effectively reduced, and meanwhile, the low signal quality influence can be ensured. Based on the embodiment of the application, the peak clipping effect can be generated aiming at any signal system, the pressure of a power amplifier at the rear end of the equipment is relieved, and the peak clipping implementation difficulty and the implementation cost of the related equipment are greatly simplified. Specifically, the embodiment of the application can be applied to wireless signal relay equipment such as a repeater and the like; envelope calculation is carried out on the time domain signal by giving a peak clipping threshold value Ath; directly eliminating the part of the envelope which exceeds the threshold value, and keeping the phase of the signal before elimination; the part of the time domain signal with the envelope not exceeding the threshold value is directly output without any processing, the process is not influenced by a signal system, the realization cost is low, and the quick realization and the application are convenient.
In one embodiment, a method for reducing a peak-to-average ratio of a signal is provided, as shown in fig. 1, including:
step S110, performing envelope calculation on the input signal to obtain an envelope value of the signal.
Step S120, perform phase calculation on the input signal to obtain a phase value of the signal.
Step S130, perform peak clipping on the portion of the envelope value of the signal that exceeds the peak clipping threshold to obtain a first peak clipping signal.
Step S140, performing phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal.
And step S150, outputting signals based on the second peak clipping signal.
Specifically, an input signal is detected in real time, envelope calculation and phase calculation are carried out on the input signal, an envelope value and a phase value of the signal are obtained respectively, and tracking monitoring of signal envelope and phase monitoring of signal sampling points are achieved. Based on the envelope value of the peak clipping threshold detection signal, the peak clipping is performed on the part exceeding the peak clipping threshold in the envelope value to obtain a signal after peak clipping, namely a first peak clipping signal, and the maximum peak-to-average ratio of the signal is ensured not to exceed a preset threshold value. And carrying out phase reduction on the peak-clipped signal according to the phase value of the signal, keeping the phase of the signal before cancellation, and realizing reduction of the peak-to-average ratio of the input signal, thereby outputting the signal and finishing wireless signal relay. Based on this, the time domain peak clipping operation can be performed on any standard signal.
It should be noted that the embodiments of the present application can be executed by a wireless signal relay device, a processor or a baseband chip of the wireless signal relay device, and the like, for example, an FPGA (Field-Programmable Gate Array). Wherein the envelope calculation is obtainable based on an envelope detection circuit; the phase calculation may be obtained based on a phase detection circuit; the input signal may be a time domain signal. It should be noted that the envelope calculation in signal processing may be a curve of amplitude over time; in the embodiment of the application, the envelope calculation of the input signal is the envelope calculation in the time domain; the envelope calculation can be used to enable tracking monitoring of the amplitude of the signal. The phase calculation can be used for calculating the phase of a sampling value of an input signal, realizing the phase monitoring of the sampling point and acquiring the phase characteristics.
Further, detecting an envelope value of the input signal based on a peak clipping threshold, and if the envelope value of the signal has a part exceeding the peak clipping threshold, performing peak clipping processing on the part exceeding the peak clipping threshold to ensure that the maximum peak-to-average ratio of the signal does not exceed a preset threshold value; and for the part of the input signal, the envelope value of which does not exceed the peak clipping threshold, the part can be directly output without any processing. That is, if there is a portion exceeding the peak clipping threshold in the envelope value of the input signal, the peak value of the portion is reduced to be equal to or lower than the peak clipping threshold. Wherein, the peak clipping process can be peak clipping in time domain; the number of peaks whose envelope value exceeds the peak clipping threshold may be 0, 1, 2 or 3, etc., and is not limited herein. Alternatively, the peak clipping process may be to reduce the portion exceeding the peak clipping threshold to a threshold value, or to reduce the portion exceeding the peak clipping threshold proportionally, etc. The peak clipping threshold can be set according to practical application. In one example, as shown in fig. 2, an envelope calculation is performed on the time domain signal (as in fig. 2(a)), a portion of the envelope exceeding a threshold value is directly eliminated (as in fig. 2(b)), and the phase of the signal before elimination is restored; and directly outputting the part of the time domain signal, the envelope of which does not exceed the threshold value, without any treatment.
For the signal after peak clipping, phase reduction processing is carried out on the signal by adopting a phase value, and the phase of the signal before elimination is reduced so as to retain the original phase characteristic and prevent the frequency spectrum from regeneration; based on the method, the stability of the maximum peak value of the rear-end output signal can be ensured, the performance stability of the system is improved, and the design complexity of the rear-end amplifier is reduced while the working robustness of the system is ensured.
The embodiment of the application can calculate the envelope of the signal and the phase of the signal sampling value in real time, and ensures that the peak value of each sampling point of the input signal is monitored in real time. Based on the embodiment of the application, the peak clipping effect can be generated aiming at any signal system, the pressure of a power amplifier at the rear end of the equipment is relieved, and the complexity and the cost for realizing the reduction of the peak-to-average ratio are reduced. The embodiment of the application is a generalized peak clipping operation which is not required to be carried out according to a signal system, and the peak-to-average ratio of signals is effectively reduced by operating the signals in amplitude and phase, and meanwhile, the influence on the signal quality can be reduced; based on the method, the signal coverage quality can be effectively improved, the uploading and downloading speed is improved, and the user experience is improved.
In one example, based on the embodiment of the present application, for an LTE (Long Term Evolution) signal par, peak clipping is performed from 9.8dB to 8dB, EVM (Error Vector Magnitude) can be controlled within 4.0%, resource occupancy is reduced by 5%, and meanwhile, normal operation of the entire system can be ensured.
In one embodiment, as shown in fig. 3, the step of performing peak clipping on a portion of the envelope value of the signal that exceeds a peak clipping threshold to obtain a first peak clipping signal includes:
step S132, detecting whether the envelope value of the signal has a portion exceeding the peak clipping threshold, and if so, reducing the portion exceeding the peak clipping threshold to the peak clipping threshold.
Specifically, a peak value state of an envelope value of a signal is detected, the detected peak value is compared with a peak clipping threshold, whether peak clipping processing is performed or not is determined, and if the peak value exceeding the peak clipping threshold exists, the peak value exceeding the peak clipping threshold is reduced to the peak clipping threshold, so that a first peak clipping signal is obtained; and performing peak clipping processing on the part which does not exceed the peak clipping threshold. Based on this, the embodiment of the application can complete the reduction of the peak value through simple threshold detection and peak clipping processing, reduce the complexity of the peak-to-average ratio reduction algorithm, is not influenced by the signal system, has a very wide application range and a low implementation cost, and is convenient for quick implementation and application.
In one embodiment, as shown in fig. 3, the step of performing phase reduction on the first peak clipping signal according to the phase value of the signal to obtain the second peak clipping signal includes:
step S142, a peak clipping point of the first peak clipping signal is obtained, and phase restoration is performed on the peak clipping point according to the phase value.
Specifically, when the phase of the signal after peak clipping is reduced, the peak clipping point of the signal can be obtained first; according to the phase value obtained by phase calculation, carrying out phase reduction on the peak clipping point to keep the phase of the signal before peak clipping so as to obtain a second peak clipping signal; wherein, the phase reduction treatment is not needed for the part which is not subjected to peak clipping. Based on this, the embodiment of the application can perform phase reduction on the signal after peak clipping through simple phase calculation, so that not only can the peak-to-average ratio of the signal be effectively reduced, but also the influence on the signal quality can be reduced, and the peak clipping effect can be generated aiming at any signal indication.
In one embodiment, as shown in fig. 4, before the step of performing envelope calculation on the input signal to obtain an envelope value of the signal, the method further includes:
step S102, performing down-conversion and analog-to-digital conversion processing on the signal received by the first antenna to obtain a baseband receiving signal.
And step S104, performing digital intermediate frequency processing on the baseband received signal to obtain an input signal.
Specifically, the wireless signal relay equipment receives a signal through a first antenna, and performs down-conversion processing and analog-to-digital conversion processing on the received signal to obtain a baseband received signal; further carrying out digital intermediate frequency processing on the baseband receiving signal to obtain an input signal; and monitoring the envelope value and the phase value of the input signal in real time, and realizing peak clipping and signal restoration of the input signal so as to reduce the peak-to-average ratio of the signal.
In one embodiment, as shown in fig. 4, the step of outputting a signal based on the second peak clipping signal comprises:
and step S152, performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal.
Specifically, based on the obtained second peak clipping signal, digital-to-analog conversion processing and up-conversion processing may be further performed to obtain and output a baseband output signal, so as to complete baseband processing of the signal. The embodiment of the application can ensure that the peak-to-average ratio of the output signal of the system is effectively reduced through specific related operation after the peak-to-average ratio algorithm is carried out, so that the aim of improving the optimization of the equipment efficiency index is fulfilled.
In an embodiment, as shown in fig. 4, after the step of performing digital-to-analog conversion and frequency up-conversion processing based on the second peak clipping signal to obtain a baseband output signal, the method further includes:
in step S156, the baseband output signal is amplified and the amplified signal is output.
Specifically, the signals after digital-to-analog conversion and up-conversion processing can be further amplified and then output, thereby completing relay amplification of the wireless signals.
In one embodiment, as shown in fig. 5, the step of performing digital-to-analog conversion and frequency up-conversion processing based on the second peak clipping signal to obtain a baseband output signal includes:
step S154, the second peak clipping signal is filtered, and digital-to-analog conversion and up-conversion processing are performed on the filtered signal.
Specifically, after link peak clipping and phase reduction processing and before digital-to-analog conversion and up-conversion processing, filtering operation can be added, so that the peak value offset function is ensured, the adjacent channel power suppression ratio index of the output signal is effectively improved, and the digital predistortion function is actively played.
In one embodiment, the following steps may be implemented by baseband design:
(1) and sampling the input signal in real time, and carrying out real-time calculation and updating of the envelope and the phase to realize the tracking of the amplitude and the phase of the signal.
(2) And detecting the comparison state of the signal peak value and a preset threshold, and determining whether to carry out peak clipping operation or not to ensure the maximum peak-to-average ratio of the signal.
(3) And the phase information of the peak clipping point is restored, and the frequency spectrum regeneration is reduced.
It should be understood that although the steps in the flowcharts of fig. 1, 3 to 5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1, 3 to 5 may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, there is provided a signal peak-to-average ratio reduction apparatus, as shown in fig. 6, including:
and the envelope calculation module is used for carrying out envelope calculation on the input signal to obtain an envelope value of the signal.
And the phase calculation module is used for performing phase calculation on the input signal to obtain a phase value of the signal.
And the peak clipping module is used for carrying out peak clipping on the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal.
And the phase reduction module is used for carrying out phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal.
And the signal output module is used for outputting signals based on the second peak clipping signal.
For the specific definition of the signal peak-to-average ratio reduction device, reference may be made to the above definition of the signal peak-to-average ratio reduction method, which is not described herein again. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The modules in the signal peak-to-average ratio reduction device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, there is provided an apparatus comprising:
a first antenna for acquiring an input signal.
And the second antenna is used for outputting signals.
And the processing module is respectively connected with the first antenna and the second antenna.
The processing module is used for realizing the following steps:
and carrying out envelope calculation on the input signal to obtain an envelope value of the signal.
And carrying out phase calculation on the input signal to obtain a phase value of the signal.
And carrying out peak clipping on the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal.
And carrying out phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal.
And outputting the signal based on the second peak clipping signal.
Specifically, the device may be a wireless relay device such as a repeater.
In one embodiment, the processing module performs peak clipping on a portion of the envelope value of the signal that exceeds a peak clipping threshold, and the step of obtaining the first peak clipping signal includes:
and detecting whether the envelope value of the signal has a part exceeding the peak clipping threshold, and if so, reducing the part exceeding the peak clipping threshold to the peak clipping threshold.
In one embodiment, the step of performing, by the processing module, phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal includes:
and acquiring a peak clipping point of the first peak clipping signal, and carrying out phase reduction on the peak clipping point according to the phase value.
In one embodiment, before the step of performing envelope calculation on the input signal to obtain an envelope value of the signal, the processing module further includes:
and performing down-conversion and analog-to-digital conversion processing on the signal received by the first antenna to obtain a baseband receiving signal.
And carrying out digital intermediate frequency processing on the baseband receiving signal to obtain an input signal.
In one embodiment, the processing module performs the step of outputting the signal based on the second peak clipping signal, including:
and performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal.
In one embodiment, after the step of performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain the baseband output signal, the processing module further includes:
and amplifying the baseband output signal and outputting the amplified signal.
In one embodiment, the step of performing digital-to-analog conversion and up-conversion processing by the processing module based on the second peak clipping signal to obtain the baseband output signal includes:
and filtering the second peak clipping signal, and performing digital-to-analog conversion and up-conversion processing on the filtered signal.
In one embodiment, as shown in fig. 7, the processing module may be divided into a down-conversion and AD-conversion module, an intermediate frequency module, an amplitude and phase calculation module, an amplitude control module, a phase reduction module, and a DA-conversion and up-conversion module. After the processing module finishes the peak value offset, DA conversion and up-conversion are finished to ensure that the peak-to-average ratio of the signal transmitted to the rear-end power amplifier is controlled within a preset range, and further the rear-end design pressure of the equipment can be reduced on the premise of improving the high-power output of the equipment.
The processing module may perform the following steps:
(1) and carrying out envelope calculation and updating of the signal in real time, and realizing tracking monitoring of the signal envelope.
(2) And carrying out phase calculation updating of the signal sampling points in real time to realize phase monitoring of the signal sampling points.
(3) And detecting the peak value state of the signal envelope value, comparing the peak value state with a preset peak clipping threshold, determining whether to perform peak clipping operation or not, and ensuring that the maximum peak-to-average ratio of the signal does not exceed a preset threshold value.
(4) Directly eliminating the part exceeding the threshold value in the envelope, and keeping the phase of the signal before elimination; and directly outputting the part of the time domain signal, the envelope of which does not exceed the threshold value, without any treatment.
In one embodiment, the processing module may include:
a first frequency conversion circuit; the input end of the first frequency conversion circuit is used for being connected with the first antenna.
An amplitude detection circuit; the input end of the amplitude detection circuit is connected with the output end of the first frequency conversion circuit.
A phase detection circuit; the input end of the phase detection circuit is connected with the output end of the first frequency conversion circuit.
An amplitude control circuit; the first input end of the amplitude control circuit is connected with the output end of the first frequency conversion circuit, and the second input end of the amplitude control circuit is connected with the output end of the amplitude detection circuit.
A phase recovery circuit; the first input end of the phase recovery circuit is connected with the output end of the phase detection circuit, and the second input end of the phase recovery circuit is connected with the output end of the amplitude control circuit.
A second frequency conversion circuit; the input end of the second frequency conversion circuit is connected with the output end of the phase recovery circuit, and the output end of the second frequency conversion circuit is used for being connected with the second antenna.
The first frequency conversion circuit can carry out frequency conversion processing on signals acquired by the first antenna to obtain input signals and send the input signals to the amplitude control circuit, and meanwhile, the amplitude detection circuit and the phase detection circuit can monitor the amplitude and the phase of the input signals in real time. The amplitude control circuit can acquire amplitude information detected by the amplitude detection circuit, and performs amplitude control on the input signal according to the amplitude information to obtain a first peak clipping signal and send the first peak clipping signal to the phase recovery circuit; alternatively, the amplitude control circuit may perform peak clipping on peaks that exceed a threshold, or scale down the highest peak, etc. The phase recovery circuit can obtain phase information detected by the phase detection circuit, and carries out phase recovery on the first peak clipping signal according to the phase information to obtain a second peak clipping signal and sends the second peak clipping signal to the second frequency conversion circuit, so that the phase characteristics of the original input signal are reserved. The second frequency conversion circuit can carry out frequency conversion processing on the second peak clipping signal to obtain an output signal and output the output signal through the second antenna.
Based on the structure, the input signal can be detected in real time, amplitude calculation and phase calculation are carried out on the input signal, the amplitude value and the phase value of the signal are respectively obtained, and tracking monitoring of the signal peak value and phase monitoring of the signal sampling point are achieved. Furthermore, peak clipping processing can be carried out on the signals, and the maximum peak-to-average ratio of the signals is ensured not to exceed a preset threshold value; and carrying out phase reduction on the peak-clipped signal according to the phase value of the signal, keeping the phase of the signal before cancellation, and realizing reduction of the peak-to-average ratio of the input signal, thereby outputting the signal and finishing wireless signal relay. Based on this, the time domain peak clipping operation can be performed on any standard signal. Wherein, the input signal can be a time domain signal; the embodiment of the application can process the signal in the time domain so as to reduce the peak-to-average ratio of the signal.
It should be noted that the first frequency conversion circuit may be configured to perform corresponding frequency conversion processing on signals of different systems received by the antenna, so as to facilitate subsequent detection and processing of amplitude and phase; optionally, the first frequency conversion circuit may include a down-conversion circuit and an intermediate frequency circuit, and may further include an analog-to-digital conversion circuit, which is not limited herein. The amplitude detection circuit can be used for detecting and tracking the amplitude of the signal in real time, particularly the peak state of the signal. The phase detection circuit can be used for detecting and tracking the phase characteristics of the signals in real time. The amplitude control circuit can be used for reducing the peak value of the signal, for example, controlling the peak value of the signal to be below a preset threshold; specifically, the amplitude control circuit may be preset with a threshold, and for a peak value exceeding the threshold in the input signal, the peak value may be reduced below the threshold, and for a part not exceeding the threshold, the peak value may be directly output without any processing.
The phase recovery circuit may be configured to phase recover the signal based on the phase characteristic. Optionally, when performing phase reduction on the peak-clipped signal, a peak clipping point of the signal may be obtained first; according to the phase value obtained by phase calculation, carrying out phase reduction on the peak clipping point so as to keep the phase of the signal before peak clipping; wherein, the phase reduction treatment is not needed for the part which is not subjected to peak clipping. Based on this, the embodiment of the application can perform phase reduction on the signal after peak clipping through simple phase detection, so that not only can the peak-to-average ratio of the signal be effectively reduced, but also the influence on the signal quality can be reduced, and the peak clipping effect can be generated aiming at any signal indication.
The second frequency conversion circuit can be used for carrying out corresponding frequency conversion processing aiming at the system of the processed signal, so that subsequent gain amplification and output are facilitated; optionally, the second frequency conversion circuit may include an up-conversion circuit, and may further include a digital-to-analog conversion circuit, and the like, which is not limited herein.
In one embodiment, the amplitude detection circuit is an envelope detection circuit.
In one embodiment, the amplitude control circuit includes a threshold detection circuit and a peak clipping circuit.
The input end of the threshold detection circuit is connected with the output end of the amplitude detection circuit; the first input end of the peak clipping circuit is connected with the output end of the first frequency conversion circuit, the second input end of the peak clipping circuit is connected with the output end of the threshold detection circuit, and the output end of the peak clipping circuit is connected with the second input end of the phase recovery circuit.
In one embodiment, the first frequency conversion circuit includes a down-conversion circuit and an intermediate frequency circuit.
The input end of the down-conversion circuit is used for being connected with a first antenna, and the output end of the down-conversion circuit is respectively connected with the input end of the amplitude detection circuit, the input end of the phase detection circuit and the first input end of the amplitude control circuit through the intermediate frequency circuit.
In one embodiment, the down-conversion circuit includes a down-conversion unit and an analog-to-digital conversion unit.
The input end of the down-conversion unit is used for being connected with the first antenna, and the output end of the down-conversion unit is connected with the intermediate frequency circuit through the analog-to-digital conversion unit.
In one embodiment, the second frequency conversion circuit includes a digital-to-analog conversion unit and an up-conversion unit.
The input end of the digital-to-analog conversion unit is connected with the output end of the phase recovery circuit, and the output end of the digital-to-analog conversion unit is connected with the second antenna through the up-conversion unit.
In one embodiment, the processing module further comprises a filtering circuit.
The output end of the phase recovery circuit is connected with the input end of the second frequency conversion circuit through the filter circuit.
For the specific limitations of the device, reference may be made to the above limitations of the signal peak-to-average ratio reduction method, which are not described herein again.
In one embodiment, a computer storage medium is provided, on which a computer program is stored, which when executed by a processor implements a signal peak-to-average ratio reduction method as described above.
For the specific definition of the storage medium, reference may be made to the above definition of the signal peak-to-average ratio reduction method, which is not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus DRAM (RDRAM), and interface DRAM (DRDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A method for signal peak-to-average power ratio reduction, comprising:
carrying out envelope calculation on an input signal to obtain an envelope value of the signal;
carrying out phase calculation on the input signal to obtain a phase value of the signal;
clipping the peak of the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal;
according to the phase value of the signal, carrying out phase reduction on the first peak clipping signal to obtain a second peak clipping signal;
and outputting a signal based on the second peak clipping signal.
2. The method of claim 1, wherein the step of performing peak clipping on a portion of the envelope value of the signal exceeding a peak clipping threshold to obtain a first peak clipping signal comprises:
and detecting whether the envelope value of the signal has a part exceeding the peak clipping threshold, and if so, reducing the part exceeding the peak clipping threshold to the peak clipping threshold.
3. The method of claim 1, wherein the step of performing phase reduction on the first peak-clipping signal according to the phase value of the signal to obtain a second peak-clipping signal comprises:
and acquiring a peak clipping point of the first peak clipping signal, and carrying out phase reduction on the peak clipping point according to the phase value.
4. A method as claimed in any one of claims 1 to 3, wherein the step of performing envelope calculation on the input signal to obtain an envelope value of the signal is preceded by the step of:
performing down-conversion and analog-to-digital conversion processing on a signal received by a first antenna to obtain a baseband receiving signal;
and carrying out digital intermediate frequency processing on the baseband receiving signal to obtain the input signal.
5. The signal peak-to-average power ratio reduction method according to any one of claims 1 to 3, wherein the step of outputting the signal based on the second peak clipping signal comprises:
and performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal.
6. The method of claim 5, wherein after the step of performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal, the method further comprises:
and amplifying the baseband output signal and outputting the amplified signal.
7. The method of claim 5, wherein the step of performing digital-to-analog conversion and up-conversion processing based on the second peak clipping signal to obtain a baseband output signal comprises:
and filtering the second peak clipping signal, and performing digital-to-analog conversion and up-conversion processing on the filtered signal.
8. A signal peak-to-average power ratio reduction apparatus, comprising:
the envelope calculation module is used for carrying out envelope calculation on the input signal to obtain an envelope value of the signal;
the phase calculation module is used for carrying out phase calculation on the input signal to obtain a phase value of the signal;
the peak clipping module is used for carrying out peak clipping on the part exceeding the peak clipping threshold in the envelope value of the signal to obtain a first peak clipping signal;
the phase reduction module is used for carrying out phase reduction on the first peak clipping signal according to the phase value of the signal to obtain a second peak clipping signal;
and the signal output module is used for outputting signals based on the second peak clipping signal.
9. An apparatus, comprising:
a first antenna for acquiring an input signal;
a second antenna for performing signal output;
a processing module for implementing the signal peak-to-average ratio reduction method according to any one of claims 1 to 7; the processing module is respectively connected with the first antenna and the second antenna.
10. A computer storage medium having a computer program stored thereon, the program, when executed by a processor, implementing a method for signal peak-to-average ratio reduction as claimed in any one of claims 1 to 7.
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