CN117278185B - Peak value reduction system and method based on OFDM system - Google Patents
Peak value reduction system and method based on OFDM system Download PDFInfo
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- 238000004891 communication Methods 0.000 abstract description 10
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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Abstract
The invention discloses a peak value reduction system and method based on an OFDM system, and relates to the technical field of communication. The system comprises: the peak detection module is used for inputting an original signal and a target threshold value and outputting the position of each peak value and corresponding amplitude and phase information; the peak value scaling module is used for calculating the difference between the peak value and the target threshold value, obtaining and outputting a calculation result, and generating complex value weight for scaling the peak clipping pulse coefficient; a distributor for distributing the peak clipping pulse generator according to the input peak value; and the peak clipping pulse generator is used for generating peak clipping pulses at each peak position and performing peak clipping processing. The invention adopts configurable peak clipping pulse to clip the signal so as to adapt to different signal bandwidths and carrier configuration and improve the performance.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a peak value reduction system and method based on an OFDM system.
Background
Before the OFDM technology is proposed, when the carrier is used to transmit signals, a larger carrier interval needs to be ensured, and a certain guard interval needs to be added, so that the spectrum utilization rate is greatly limited. The OFDM technology not only can improve the frequency spectrum utilization rate, but also has the advantages of resisting frequency selective fading, resisting signal interference and the like, becomes one of key technologies of LTE and NR, and is widely applied to modern communication systems. However, since the peak-to-average ratio of the signal is high due to the superposition performance of multiple subcarriers, the peak-to-average ratio may cause PA (Power Amplifier) to operate in a saturation region, and in-band and out-of-band interference is introduced, so that signal distortion is caused.
The OFDM signal is typically peak cut using the PC-CFR (Pulse Cancellation Crest Factor Reduction) algorithm. The main idea is to detect the signal peak value, then use the pulse signal to correspond to the peak value in the original signal, and subtract the pulse from the original signal after scaling, so as to achieve the purpose of signal peak value reduction. However, since the signal bandwidth is variable and the carrier position and frequency interval are variable under the carrier aggregation condition, peak clipping performance is reduced by using a fixed pulse signal and critical band performance is affected.
Disclosure of Invention
In order to overcome the above problems or at least partially solve the above problems, embodiments of the present invention provide a peak reduction system and method based on an OFDM system, which uses configurable peak clipping pulses to clip signals, so as to adapt to different signal bandwidths and carrier configurations, and improve performance.
Embodiments of the present invention are implemented as follows:
in a first aspect, an embodiment of the present invention provides a peak reduction system based on an OFDM system, including: a peak detection module, a peak scaling module, a distributor, and a peak clipping pulse generator, wherein:
the peak detection module is used for inputting an original signal and a target threshold value and outputting the position of each peak value and corresponding amplitude and phase information;
the peak value scaling module is used for calculating the difference between the peak value and the target threshold value, obtaining and outputting a calculation result, and generating complex value weight for scaling the peak clipping pulse coefficient;
a distributor for distributing the peak clipping pulse generator according to the input peak value;
and the peak clipping pulse generator is used for generating peak clipping pulses at each peak position and performing peak clipping processing.
In order to solve the problems in the prior art, the system designs a configurable pulse peak clipping scheme based on an OFDM system through the matching of a plurality of plates such as a peak detection module, a peak scaling module, a distributor, a peak clipping pulse generator and the like. The spectrum of the pulse signal used for peak clipping in the PC-CFR algorithm is matched with the spectrum of the input signal, and the performance is improved by adaptively selecting the corresponding peak clipping pulse according to the actual transmitted signal spectrum.
Based on the first aspect, in some embodiments of the present invention, the peak scaling module includes a calculating unit and a scaling unit, wherein:
the calculating unit is used for calculating the difference between the peak value and the target threshold value to obtain and output a calculation result;
and the scaling unit is used for generating complex value weights according to the amplitude and phase information in the calculation result and scaling the peak clipping pulse coefficients.
Based on the first aspect, in some embodiments of the present invention, the dispenser described above comprises a detection unit and a dispensing unit, wherein:
the detection unit is used for detecting whether all peak clipping pulse generators are in an idle state when one peak arrives, and if all peak clipping pulse generators are not idle, the peak is not processed; otherwise, the distribution unit works;
and the distribution unit is used for distributing an idle peak clipping pulse generator to carry out peak clipping processing on the peak.
In a second aspect, an embodiment of the present invention provides a peak reduction method based on an OFDM system, including the steps of:
the input original signal passes through a peak detection module, and the corresponding peak position is detected and output through the peak detection module;
calculating and outputting the difference between the peak value and the target threshold value through a peak value scaling module, and generating complex value weight;
distributing corresponding peak clipping pulse generators according to the input peak values through a distributor;
and generating peak clipping pulse at the corresponding peak position by a peak clipping pulse generator, and scaling the peak clipping pulse coefficient according to the complex value weight to perform peak clipping processing.
In order to solve the problems in the prior art, the method and the system match the spectrum of the pulse signal used for peak clipping in the PC-CFR algorithm with the spectrum of the input signal, and the pulse signal with proper length can be configured for peak clipping by adaptively selecting the corresponding peak clipping pulse according to the actual transmitted signal spectrum; and the selection or superposition of the corresponding peak clipping pulses is carried out based on different carrier signals so as to effectively clip peaks, thereby improving the performance.
Based on the second aspect, in some embodiments of the present invention, the method for performing peak clipping processing includes the following steps:
and selecting corresponding peak clipping pulses according to different types of carrier signals to carry out peak clipping processing, wherein the different types of carrier signals comprise single carrier signals and multi-carrier signals.
Based on the second aspect, in some embodiments of the present invention, the method for selecting the corresponding peak clipping pulse according to the carrier signals of different categories to perform peak clipping processing includes the following steps:
for a single carrier signal, selecting peak clipping pulses with corresponding lengths according to different signal bandwidths to perform peak clipping processing;
for the multi-carrier signal, corresponding peak clipping pulses are selected according to the signal bandwidth on each carrier, and the peak clipping pulses are added in the time domain to obtain and adopt the target peak clipping pulses to carry out peak clipping processing.
Based on the second aspect, in some embodiments of the present invention, the method for selecting peak clipping pulses with corresponding lengths according to different signal bandwidths to perform peak clipping processing includes the following steps:
generating and storing pulse signals with different bandwidths;
when a signal with any bandwidth is input, a matched pulse signal is selected from stored pulse signals to be used as a peak clipping pulse for peak clipping processing.
Based on the second aspect, in some embodiments of the present invention, the method for selecting the corresponding peak clipping pulse according to the signal bandwidth on each carrier, and performing time domain addition on each peak clipping pulse to obtain and perform peak clipping processing by using the target peak clipping pulse includes the following steps:
selecting corresponding peak clipping pulses according to the signal bandwidths on each carrier wave, and taking the longest pulse in the selected peak clipping pulses as a reference pulse;
zero padding is carried out behind the pulse coefficient of other peak clipping pulse with the peak clipping pulse length smaller than the reference pulse length, so that the other peak clipping pulse length is aligned with the reference pulse length, and domain addition is carried out to obtain a target time domain pulse;
and extracting a target time domain pulse with half length as a target peak clipping pulse to perform peak clipping processing.
The embodiment of the invention has at least the following advantages or beneficial effects:
the embodiment of the invention provides a peak value reduction system and a peak value reduction method based on an OFDM system, which are used for matching the frequency spectrum of a pulse signal for peak clipping in a PC-CFR algorithm with the frequency spectrum of an input signal, and can configure a pulse signal with proper length to carry out peak value reduction by adaptively selecting a corresponding peak clipping pulse according to the actual transmitted signal frequency spectrum; and the selection or superposition of the corresponding peak clipping pulses is carried out based on different carrier signals so as to effectively clip peaks, thereby improving the performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a peak reduction system based on an OFDM system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a peak reduction method based on an OFDM system according to an embodiment of the present invention;
FIG. 3 is a flow chart of peak clipping pulse generation according to an embodiment of the present invention;
fig. 4 is a block diagram of an electronic device according to an embodiment of the present invention.
Reference numerals illustrate: 100. a peak detection module; 200. a peak scaling module; 300. a dispenser; 101. a memory; 102. a processor; 103. a communication interface.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of the embodiments of the present invention, "plurality" means at least 2.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Examples
As shown in fig. 1, in a first aspect, an embodiment of the present invention provides a peak reduction system based on an OFDM system, including: a peak detection module, a peak scaling module, a distributor, and a peak clipping pulse generator, wherein:
the peak detection module is used for inputting an original signal and a target threshold value and outputting the position of each peak value and corresponding amplitude and phase information;
the peak value scaling module is used for calculating the difference between the peak value and the target threshold value, obtaining and outputting a calculation result, and generating complex value weight for scaling the peak clipping pulse coefficient;
further, the peak scaling module includes a calculating unit and a scaling unit, wherein: the calculating unit is used for calculating the difference between the peak value and the target threshold value to obtain and output a calculation result; and the scaling unit is used for generating complex value weights according to the amplitude and phase information in the calculation result and scaling the peak clipping pulse coefficients.
A distributor for distributing the peak clipping pulse generator according to the input peak value;
further, the dispenser described above comprises a detection unit and a dispensing unit, wherein: the detection unit is used for detecting whether all peak clipping pulse generators are in an idle state when one peak arrives, and if all peak clipping pulse generators are not idle, the peak is not processed; otherwise, the distribution unit works; and the distribution unit is used for distributing an idle peak clipping pulse generator to carry out peak clipping processing on the peak.
And the peak clipping pulse generator is used for generating peak clipping pulses at each peak position and performing peak clipping processing.
The input signal passes through a peak detection module and then outputs a peak position for a peak Clipping Pulse Generator (CPG) to generate a peak clipping pulse. The peak detection module inputs the original signal and the threshold value, and outputs the position of each peak value and corresponding amplitude and phase information. The peak scaling module outputs the difference between the peak and target thresholds, which also contains phase information, and can generate complex-valued weights for scaling the despicking pulse coefficients. Because of limited resources, the CPG number is limited, namely the number of peaks which can be processed simultaneously is limited; each CPG can only process one peak at a time, and the peak clipping efficiency is determined by the length of the peak clipping pulse and the number of CPGs; thus, there is a need for a reasonable allocation of CPGs. The Allocator (peak Allocator) allocates the CPG for the peak of the input. When a new peak is detected to arrive, the allocator allocates an idle CPG to eliminate the peak. The occupied CPG needs to go through half the pulse period length to return to the idle state. If the distributor detects that all CPGs are not idle when a peak arrives, the peak is not processed.
In order to solve the problems in the prior art, the system designs a configurable pulse peak clipping scheme based on an OFDM system through the matching of a plurality of plates such as a peak detection module, a peak scaling module, a distributor, a peak clipping pulse generator and the like. The spectrum of the pulse signal used for peak clipping in the PC-CFR algorithm is matched with the spectrum of the input signal, and the performance is improved by adaptively selecting the corresponding peak clipping pulse according to the actual transmitted signal spectrum.
As shown in fig. 2-3, in a second aspect, an embodiment of the present invention provides a peak reduction method based on an OFDM system, including the steps of:
s1, inputting an original signal, detecting and outputting a corresponding peak position through a peak detection module;
s2, calculating and outputting the difference between the peak value and the target threshold value through a peak value scaling module, and generating complex value weight;
s3, distributing corresponding peak clipping pulse generators according to the input peak values through a distributor;
s4, generating peak clipping pulse at the corresponding peak position through a peak clipping pulse generator, and scaling the peak clipping pulse coefficient according to the complex value weight to perform peak clipping processing.
Further, the method comprises the steps of: and selecting corresponding peak clipping pulses according to different types of carrier signals to carry out peak clipping processing, wherein the different types of carrier signals comprise single carrier signals and multi-carrier signals.
Further, the method comprises the steps of: for a single carrier signal, selecting peak clipping pulses with corresponding lengths according to different signal bandwidths to perform peak clipping processing; for the multi-carrier signal, corresponding peak clipping pulses are selected according to the signal bandwidth on each carrier, and the peak clipping pulses are added in the time domain to obtain and adopt the target peak clipping pulses to carry out peak clipping processing.
Further, the method comprises the steps of: generating and storing pulse signals with different bandwidths; when a signal with any bandwidth is input, a matched pulse signal is selected from stored pulse signals to be used as a peak clipping pulse for peak clipping processing.
In some embodiments of the present invention, a plurality of different signal bandwidths are typically supported for a single carrier signal. Because the signal sampling rate is determined, if the pulse length is shorter, under the condition of low bandwidth, obvious ripples appear in the frequency spectrum of the peak clipping pulse, and when the peak clipping is carried out by using the pulse, larger out-of-band interference is introduced, so that the out-of-band performance is seriously affected. When the pulse length is longer, the peak clipping pulse spectrum performance can be improved, but the longer peak clipping pulse leads to longer working time of each CPG, and when the peak interval in an input signal is smaller, more peaks are not processed, the condition of peak leakage occurs, and the peak clipping performance is influenced. Accordingly, to solve the above-mentioned problems, the present invention configurably selects peak clipping pulses of an appropriate length according to different signal bandwidths. Pulse signals with different bandwidths are generated and stored in advance, the pulse signals with different bandwidths are different in length, and when a signal with a certain bandwidth is input by a transmitting end, a pulse with a proper length is selected from the stored pulses for peak clipping.
Further, the method comprises the steps of: selecting corresponding peak clipping pulses according to the signal bandwidths on each carrier wave, and taking the longest pulse in the selected peak clipping pulses as a reference pulse; zero padding is carried out behind the pulse coefficient of other peak clipping pulse with the peak clipping pulse length smaller than the reference pulse length, so that the other peak clipping pulse length is aligned with the reference pulse length, and domain addition is carried out to obtain a target time domain pulse; and extracting a target time domain pulse with half length as a target peak clipping pulse to perform peak clipping processing.
In some embodiments of the present invention, for a multi-carrier signal, corresponding peak clipping pulses are selected for signal bandwidths on each carrier, and then a plurality of peak clipping pulses are added in the time domain, so as to obtain a pulse signal for peak clipping finally. When the signal bandwidths on the carriers may be different, the peak clipping pulse lengths selected according to the signal bandwidths on the carriers are different, so that the time domain summation cannot be directly performed. In order to solve the above problems, the present invention uses the longest pulse selected as the reference pulse, and because adjacent peaks may be detected, multiple CPGs are required to generate pulse signals, and then the generated pulse signals are added in the time domain to obtain the final peak clipping signal. The pulse signals may have different lengths, so that the longest pulse length is used as a reference, the zero padding is performed on the signals with other peak clipping pulse lengths smaller than the selected reference pulse, then the time domain addition is performed, and the peak clipping is performed by using the pulse signals obtained by the addition. Since only half of the pulse coefficients are effective in actual operation, half of the length of the pulse is extracted for peak clipping. The scaled pulse signal is subtracted from the original signal by the sampling point, i.e., half. The original signal is a signal obtained after the initial input signal is subjected to corresponding delay processing. The scaling is to scale the pulse signal after generating the pulse signal.
The input signal passes through a peak detection module and then outputs a peak position for a peak Clipping Pulse Generator (CPG) to generate a peak clipping pulse. The peak detection module inputs the original signal and the threshold value, and outputs the position of each peak value and corresponding amplitude and phase information. The peak scaling module outputs the difference between the peak and target thresholds, which also contains phase information, and can generate complex-valued weights for scaling the despicking pulse coefficients. Because of limited resources, the CPG number is limited, namely the number of peaks which can be processed simultaneously is limited; each CPG can only process one peak at a time, and the peak clipping efficiency is determined by the length of the peak clipping pulse and the number of CPGs; thus, there is a need for a reasonable allocation of CPGs. A Allocator (peak Allocator) module allocates CPG for Peaks of the input. When a new peak is detected to arrive, the allocator allocates an idle CPG to eliminate the peak. The occupied CPG needs to go through half the pulse period length to return to the idle state. If the distributor detects that all CPGs are not idle when a peak arrives, the peak is not processed.
In order to solve the problems in the prior art, the method and the system match the spectrum of the pulse signal used for peak clipping in the PC-CFR algorithm with the spectrum of the input signal, and the pulse signal with proper length can be configured for peak clipping by adaptively selecting the corresponding peak clipping pulse according to the actual transmitted signal spectrum; and the selection or superposition of the corresponding peak clipping pulses is carried out based on different carrier signals so as to effectively clip peaks, thereby improving the performance.
The CFR algorithm signal processing flow specifically comprises: and inputting signals to a peak detection module, scaling the signals by a scaling module based on peak coefficients, inputting the signals to a peak clipping pulse generation module, reasonably distributing the signals by a distribution module based on peak positions, sequentially inputting the signals to a Sinc pulse generation module (sine pulse generation module), carrying out peak reduction according to pulse signals with proper length, and finally accumulating the signals by an accumulator and outputting the signals.
The peak clipping pulse generation flow is shown in fig. 3, and includes: the method comprises the steps of carrying out peak detection on signals, judging whether all CPGs (peak clipping pulse generators) are busy or not according to the current detected peak value of the difference CPG (peak clipping pulse generator) number N of filter coefficient input domain threshold values, and if so, carrying out peak detection again; if not, calculating peak clipping pulse, and clipping the peak until all signals are completed.
As shown in fig. 4, in a third aspect, an embodiment of the present application provides an electronic device, which includes a memory 101 for storing one or more programs; a processor 102. The method of any of the second aspects described above is implemented when one or more programs are executed by the processor 102.
And a communication interface 103, where the memory 101, the processor 102 and the communication interface 103 are electrically connected directly or indirectly to each other to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory 101 may be used to store software programs and modules that are stored within the memory 101 for execution by the processor 102 to perform various functional applications and data processing. The communication interface 103 may be used for communication of signaling or data with other node devices.
The Memory 101 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.
The processor 102 may be an integrated circuit chip with signal processing capabilities. The processor 102 may be a general purpose processor including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
In the embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other manners as well. The above described system and method embodiments are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by the processor 102, implements a method as in any of the second aspects described above. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A peak reduction system based on an OFDM system, comprising: a peak detection module, a peak scaling module, a distributor, and a peak clipping pulse generator, wherein:
the peak detection module is used for inputting an original signal and a target threshold value and outputting the position of each peak value and corresponding amplitude and phase information;
the peak value scaling module is used for calculating the difference between the peak value and the target threshold value, obtaining and outputting a calculation result, and generating complex value weight for scaling the peak clipping pulse coefficient;
a distributor for distributing the peak clipping pulse generator according to the input peak value;
the peak clipping pulse generator is used for generating peak clipping pulses at each peak position and performing peak clipping treatment;
the peak clipping processing comprises the following steps: selecting corresponding peak clipping pulses according to different types of carrier signals to carry out peak clipping processing, wherein the different types of carrier signals comprise single carrier signals and multi-carrier signals;
the selecting the corresponding peak clipping pulse according to the carrier signals of different categories to perform peak clipping processing comprises the following steps:
for a single carrier signal, selecting peak clipping pulses with corresponding lengths according to different signal bandwidths to perform peak clipping processing; for the multi-carrier signal, corresponding peak clipping pulses are selected according to the signal bandwidth on each carrier, and the peak clipping pulses are added in the time domain to obtain and adopt the target peak clipping pulses to carry out peak clipping processing.
2. The peak clipping system based on an OFDM system according to claim 1, wherein the peak scaling module comprises a calculation unit and a scaling unit, wherein:
the calculating unit is used for calculating the difference between the peak value and the target threshold value to obtain and output a calculation result;
and the scaling unit is used for generating complex value weights according to the amplitude and phase information in the calculation result and scaling the peak clipping pulse coefficients.
3. The peak clipping system based on an OFDM system according to claim 1, wherein the allocator comprises a detection unit and an allocation unit, wherein:
the detection unit is used for detecting whether all peak clipping pulse generators are in an idle state when one peak arrives, and if all peak clipping pulse generators are not idle, the peak is not processed; otherwise, the distribution unit works;
and the distribution unit is used for distributing an idle peak clipping pulse generator to carry out peak clipping processing on the peak.
4. A peak reduction method based on an OFDM system, comprising the steps of:
the input original signal passes through a peak detection module, and the corresponding peak position is detected and output through the peak detection module;
calculating and outputting the difference between the peak value and the target threshold value through a peak value scaling module, and generating complex value weight;
distributing corresponding peak clipping pulse generators according to the input peak values through a distributor;
generating peak clipping pulse at the corresponding peak position by a peak clipping pulse generator, and scaling the peak clipping pulse coefficient according to the complex value weight to perform peak clipping treatment;
the peak clipping treatment comprises the following steps: selecting corresponding peak clipping pulses according to different types of carrier signals to carry out peak clipping processing, wherein the different types of carrier signals comprise single carrier signals and multi-carrier signals;
the peak clipping processing of selecting the corresponding peak clipping pulse according to the carrier signals of different categories comprises the following steps:
for a single carrier signal, selecting peak clipping pulses with corresponding lengths according to different signal bandwidths to perform peak clipping processing; for the multi-carrier signal, corresponding peak clipping pulses are selected according to the signal bandwidth on each carrier, and the peak clipping pulses are added in the time domain to obtain and adopt the target peak clipping pulses to carry out peak clipping processing.
5. The peak clipping method based on the OFDM system as set forth in claim 4, wherein said method for selecting peak clipping pulses of corresponding length according to different signal bandwidths includes the steps of:
generating and storing pulse signals with different bandwidths;
when a signal with any bandwidth is input, a matched pulse signal is selected from stored pulse signals to be used as a peak clipping pulse for peak clipping processing.
6. The peak clipping method based on the OFDM system as set forth in claim 4, wherein the method for selecting the corresponding peak clipping pulse according to the signal bandwidth on each carrier and performing time domain addition on each peak clipping pulse to obtain and use the target peak clipping pulse for peak clipping includes the steps of:
selecting corresponding peak clipping pulses according to the signal bandwidths on each carrier wave, and taking the longest pulse in the selected peak clipping pulses as a reference pulse;
zero padding is carried out behind the pulse coefficient of other peak clipping pulse with the peak clipping pulse length smaller than the reference pulse length, so that the other peak clipping pulse length is aligned with the reference pulse length, and domain addition is carried out to obtain a target time domain pulse;
and extracting a target time domain pulse with half length as a target peak clipping pulse to perform peak clipping processing.
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