CN110650106A - Airspace peak clipping device and method - Google Patents
Airspace peak clipping device and method Download PDFInfo
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- CN110650106A CN110650106A CN201810673662.3A CN201810673662A CN110650106A CN 110650106 A CN110650106 A CN 110650106A CN 201810673662 A CN201810673662 A CN 201810673662A CN 110650106 A CN110650106 A CN 110650106A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Abstract
The application discloses a space domain peak clipping device and a method, which simplify the structure of the space domain peak clipping device, reduce the system time delay and reduce the system power consumption. The space domain peak clipping device comprises: the device comprises a noise extraction module (201), a carrier separation module (202), a noise projection module (203), a noise shaping module (204), a carrier aggregation module (205), a cancellation module (206) and a time delay module (207); the noise extraction module (201) is used for extracting a part of the original signal exceeding a threshold value; the carrier separation module (202) decomposes the extracted noise signals to each preset subcarrier; the noise projection module (203) is used for projecting each mixed noise signal to the public noise space of all user channels in the corresponding subcarrier respectively; the noise shaping module (204) is used for carrying out spectrum constraint on the projected noise signal; and the carrier aggregation module (205) is used for carrying out carrier aggregation on the constrained and shaped noise signals.
Description
Technical Field
The present application relates to the field of communications, and in particular, to an airspace peak clipping device and method.
Background
With the development of 5G, the number of antennas is greatly increased especially in the high frequency domain, and beam forming and beam tracking based on large-scale antennas are hot research points in the industry. Unlike antenna arrays used in 2G, 3G, or 4G systems, large-scale antenna arrays are used in 5G systems. For the conventional peak clipping, before a 4G system, the operation is only carried out in a time domain under the condition of a small number of antennas (below 4T); however, the number of antennas of the current 5G system is increased greatly, and the number of antennas can be 16T, 32T, …, 128T.
In the conventional scheme, a peak clipping device shown in fig. 1 is used to perform peak clipping on an antenna signal, where the peak clipping device includes a Fast Fourier Transform (FFT) module and an Inverse Fast Fourier Transform (IFFT) module, and performs peak clipping on the antenna signal in a frequency domain.
In the existing scheme, the antenna signal needs to be subjected to peak clipping operation at the subcarrier level, the system delay is high, and the system power consumption is large.
Disclosure of Invention
The embodiment of the application provides a space domain peak clipping device and a method, which simplify the structure of the space domain peak clipping device, reduce the system time delay and reduce the system power consumption.
The present application provides in a first aspect an airspace peak clipping device, including: the system comprises a noise extraction module 201, a carrier separation module 202, a noise projection module 203, a noise shaping module 204, a carrier aggregation module 205, a cancellation module 206 and a time delay module 207; the noise extraction module 201 is configured to extract a portion of an original signal exceeding a threshold, and send the extracted noise signal to the carrier separation module 202; the carrier separation module 202 decomposes the extracted noise signals to each preset subcarrier, and sends each mixed noise signal to the noise projection module 203; the noise projection module 203 is configured to project each mixed noise signal to a public noise space of all user channels in a corresponding subcarrier, and send the projected noise signal to the noise shaping module 204; the noise shaping module 204 is configured to perform spectrum constraint on the projected noise signal, and send the noise signal subjected to constraint shaping to the carrier aggregation module 205; the carrier aggregation module 205 is configured to perform carrier aggregation on the constrained noise signal, and send the aggregated noise signal to the cancellation module 206; the cancellation module 206 is configured to cancel the delayed original signal and the aggregated noise signal; the delay module 207 is configured to delay the original signal and send the delayed signal to the cancellation module 206. In the embodiment of the application, an FFT module and an IFFT module are omitted, the structure of a space domain peak clipping device is simplified, the system time delay is reduced, and the system power consumption is reduced.
In one possible design, in a first implementation manner of the first aspect of the embodiment of the present application, the noise projection module 203 includes a spatial compression unit 2031, a spatial decompression unit 2032, a cancellation unit 2033, and a time delay unit 2034; the input end of the spatial domain compression unit 2031 and the output end of the carrier separation module 202 are electrically connected to the input end of the cancellation unit 2033, the output end of the spatial domain compression unit 2031 is electrically connected to the input end of the spatial domain decompression unit 2032, the first input end of the cancellation unit 2033 is electrically connected to the output end of the spatial domain decompression unit 2032, the second input end of the cancellation unit 2033 is electrically connected to the time delay unit 2034, and the output end of the cancellation unit 2033 is electrically connected to the input end of the noise shaping module 204; the spatial compression unit 2031 is configured to spatially compress each mixed noise signal from M-dimension to N-dimension through an M × N matrix, where M and N are positive integers; the spatial decompression unit 2032 is configured to spatially decompress the compressed noise signal from N-dimension back to M-dimension through an N × M matrix; the cancellation unit 2033 is configured to cancel the delayed original signal and the decompressed noise signal; the time delay unit 2034 is configured to delay the original signal to obtain a delayed original signal. In the implementation mode, the specific structural composition of the noise projection module is refined, and through well compressing, decompressing and canceling, noise signals are limited in a public noise space, so that the signal interference in the propagation direction of carrier waves is reduced.
In a possible design, in a second implementation manner of the first aspect of the embodiment of the present application, the carrier separation module 202 includes M branches, each branch includes a first mixer 2021 and a multistage speed change module 2022, the number of stages of the multistage speed change module 2022 is M/2, and M is a positive integer; the first mixer 2021 is configured to multiply the extracted noise signal by a preset subcarrier to obtain a first mixed signal; the pre-stage variable speed module 2022 is used to filter and decimate the first mixed signal. In the implementation mode, the specific composition structure of the carrier separation module is refined, and the carrier separation of signals is completed, so that each subcarrier works at the rate of 1 time.
In a possible design, in a second implementation manner of the first aspect of the embodiment of the present application, the carrier aggregation module 207 includes an adder 2071 and M branches, each branch includes a second mixer 2072 and a post-multistage variable-speed module 2073, the number of the stages of the post-multistage variable-speed module 2073 is M/2, and M is a positive integer; the rear multistage variable speed module 2073 is used for performing signal interpolation and filtering on the constrained and formed noise signal; the second mixer 2072 is configured to multiply the filtered noise signal by a preset subcarrier to obtain a second mixed signal; the adder 2071 is used for performing carrier aggregation on the second mixing signals. In the implementation mode, the specific composition structure of the carrier aggregation module is refined, and the carrier aggregation of the signals is completed, so that the finally synthesized signals are at a high rate.
In a possible design, in a second implementation of the first aspect of the embodiment of the present application, each stage of the front multi-stage variable speed module 2022 comprises a low pass filter LPF20221 and a decimator dec 20222; each stage of the post-multistage shift module 2053 comprises a low pass filter LPF20531 and an interpolator INTERP 20532. In the implementation mode, the specific structures of the front-mounted multi-stage speed changing module and the rear-mounted multi-stage speed changing module are refined, so that the front-mounted multi-stage speed changing module can filter and extract signals, and the rear-mounted multi-stage speed changing module can insert and filter the signals.
In one possible design, in a second implementation manner of the first aspect of the embodiment of the present application, the noise extraction module 201 includes a modulus extraction unit 2011, a peak extraction unit 2012, and a third mixer 2013; the module taking unit 2011 is configured to take a module value of the original signal to obtain a first module value of the original signal; the peak extraction unit 2012 is configured to calculate a peak extraction coefficient; the third mixer 2013 is used to multiply the original signal by the peak extraction coefficient. In the implementation manner, the composition of the noise extraction module is explained in detail, and the implementation manner of the embodiment of the application is added.
In a possible design, in a second implementation manner of the first aspect of the embodiment of the present application, when the first modulus is greater than a preset threshold, the peak extraction coefficient is 1-Th/| x |, where Th is the preset threshold and | x | is the first modulus; when the first modulus is less than or equal to a preset threshold value, the peak extraction coefficient is 0. In the implementation mode, the magnitude of the peak extraction coefficient is limited, the implementation mode of the embodiment of the application is added, and the peak-to-average ratio is reduced under the condition that the amplitude of the user error vector or the throughput rate is not changed.
A second aspect of the present application provides a spatial domain peak clipping method, where the method is applied to the spatial domain peak clipping device in any implementation manner of the first aspect, and the method includes: extracting a noise signal from an original signal; decomposing the noise signal onto each carrier; carrying out spatial projection on the noise signals on each carrier; carrying out spectrum constraint on the projected noise signal; aggregating the noise signals after constraint molding; and canceling the delayed original signal and the aggregated noise signal.
A third aspect of the present application provides a computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the method of the second aspect described above.
A fourth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the second aspect described above.
In the technical scheme provided by the embodiment of the application, the airspace peak clipping device comprises: the system comprises a noise extraction module 201, a carrier separation module 202, a noise projection module 203, a noise shaping module 204, a carrier aggregation module 205, a cancellation module 206 and a time delay module 207; the noise extraction module 201 is configured to extract a portion of an original signal exceeding a threshold, and send the extracted noise signal to the carrier separation module 202; the carrier separation module 202 decomposes the extracted noise signals to each preset subcarrier, and sends each mixed noise signal to the noise projection module 203; the noise projection module 203 is configured to project each mixed noise signal to a public noise space of all user channels in a corresponding subcarrier, and send the projected noise signal to the noise shaping module 204; the noise shaping module 204 is configured to perform spectrum constraint on the projected noise signal, and send the noise signal subjected to constraint shaping to the carrier aggregation module 205; the carrier aggregation module 205 is configured to perform carrier aggregation on the constrained noise signal, and send the aggregated noise signal to the cancellation module 206; the cancellation module 206 is configured to cancel the delayed original signal and the aggregated noise signal; the delay module 207 is configured to delay the original signal and send the delayed signal to the cancellation module 206. In the embodiment of the application, an FFT module and an IFFT module are omitted, the structure of a space domain peak clipping device is simplified, the system time delay is reduced, and the system power consumption is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a peak clipping device in a prior art;
FIG. 2 is a schematic diagram of an embodiment of a spatial domain peak clipping apparatus according to the present application;
FIG. 3 is a schematic structural diagram of a noise projection module according to the present application;
fig. 4 is a schematic structural diagram of a carrier separation module in the present application;
FIG. 5 is a schematic view of a carrier aggregation module according to the present application;
FIG. 6 is a schematic diagram of a noise extraction module according to the present application;
FIG. 7 is a schematic diagram of an embodiment of a spatial domain peak clipping method according to the present application;
fig. 8 is a schematic diagram showing the comparison between the performance of the spatial domain peak clipping device of the present application and that of the peak clipping device in the prior art.
Detailed Description
The embodiment of the application provides a space domain peak clipping device and a method, which simplify the structure of the space domain peak clipping device, reduce the system time delay and reduce the system power consumption.
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.
References throughout this specification to "first" or "second", etc., are intended to distinguish between similar items and not necessarily to describe a particular order or sequence. Furthermore, references throughout this specification to "comprising" or "having" and any variations thereof are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or circuitry is not necessarily limited to those steps or circuitry expressly listed, but may include other steps or circuitry not expressly listed or inherent to such process, method, article, or apparatus.
In the application scenario, by combining all channel characteristics (i.e., averaging all channel estimation matrices), and correspondingly calculating a noise space common to all channels, clipping noise is limited within the common noise space (for example, subtracting the matrix combining the channel characteristics by using a unit matrix), since operations performed by all Resource Blocks (RBs) are the same, it is not necessary to perform separate operations for each RB, and finally, a frequency domain operation can be converted into a time domain operation.
In the existing scheme, a large number of FFT modules and IFFT modules are used to perform peak clipping on antenna signals, so as to improve the universality of the system. Robustness, etc., and reduces the peak-to-average ratio of the system. However, a large number of FFT modules and IFFT modules consume a large amount of resources, and the total delay of the system is high and the power consumption is large.
To solve the above problem, the present application provides a spatial domain peak clipping apparatus, please refer to fig. 2, an embodiment of the spatial domain peak clipping apparatus 200 in the embodiment of the present application includes:
the system comprises a noise extraction module 201, a carrier separation module 202, a noise projection module 203, a noise shaping module 204, a carrier aggregation module 205, a cancellation module 206 and a time delay module 207;
the noise extraction module 201 is configured to extract a portion of an original signal exceeding a threshold, and send the extracted noise signal to the carrier separation module 202;
the carrier separation module 202 decomposes the extracted noise signals to each preset subcarrier, and sends each mixed noise signal to the noise projection module 203;
the noise projection module 203 is configured to project each mixed noise signal to a public noise space of all user channels in a corresponding subcarrier, and send the projected noise signal to the noise shaping module 204;
the noise shaping module 204 is configured to perform spectrum constraint on the projected noise signal, and send the noise signal subjected to constraint shaping to the carrier aggregation module 205;
the carrier aggregation module 205 is configured to perform carrier aggregation on the constrained noise signal, and send the aggregated noise signal to the cancellation module 206;
the cancellation module 206 is configured to cancel the delayed original signal and the aggregated noise signal;
the delay module 207 is configured to delay the original signal and send the delayed signal to the cancellation module 206.
It should be noted that the spatial domain peak clipping device in the embodiment of the present application is applied to a complete transmission link, and the transmission link before the spatial domain peak clipping device further includes a channel coding module (Encoder), a digital Modulation module (Modulation), a Layer mapping module (Layer Mapper), a beam forming module (Beamforming), an Inverse Fast Fourier Transform (IFFT), a digital up conversion module (DUC), and a signal rate conversion module (SRC), which are connected in sequence; the transmitting link after the spatial domain peak clipping device further includes a conventional clipping module (CFR), a digital pre-distortion module (DPD), a Digital Analog Converter (DAC) and an analog link (RF) connected in sequence.
It can be understood that, in the present application, the spatial domain clipping device is operated on a time domain, which may be a digital time domain or an analog time domain, and is not limited herein.
In the embodiment of the application, an FFT module and an IFFT module are omitted, the structure of a space domain peak clipping device is simplified, the system time delay is reduced, and the system power consumption is reduced.
In one possible implementation, as shown in fig. 3, the noise projection module 203 includes a spatial compression unit 2031, a spatial decompression unit 2032, a cancellation unit 2033, and a time delay unit 2034;
the input end of the spatial domain compression unit 2031 and the output end of the carrier separation module 202 are electrically connected to the input end of the cancellation unit 2033, the output end of the spatial domain compression unit 2031 is electrically connected to the input end of the spatial domain decompression unit 2032, the first input end of the cancellation unit 2033 is electrically connected to the output end of the spatial domain decompression unit 2032, the second input end of the cancellation unit 2033 is electrically connected to the time delay unit 2034, and the output end of the cancellation unit 2033 is electrically connected to the input end of the noise shaping module 204;
the spatial compression unit 2031 is configured to spatially compress each mixed noise signal from M-dimension to N-dimension through an M × N matrix, where M and N are positive integers;
the spatial decompression unit 2032 is configured to spatially decompress the compressed noise signal from N-dimension back to M-dimension through an N × M matrix;
the cancellation unit 2033 is configured to cancel the delayed original signal and the decompressed noise signal;
the time delay unit 2034 is configured to delay the original signal to obtain a delayed original signal.
It is understood that the electrical connection may be a physical direct electrical connection, and may also be an electrical connection realized by other elements, which are not limited herein.
In the implementation mode, the specific structural composition of the noise projection module is refined, and through well compressing, decompressing and canceling, noise signals are limited in a public noise space, so that the signal interference in the propagation direction of carrier waves is reduced.
In one possible implementation, as shown in fig. 4, the carrier separation module 202 includes M branches, each branch includes a first mixer 2021 and a front multi-stage variable speed module 2022, the number of stages of the front multi-stage variable speed module 2022 is M/2, and M is a positive integer;
the first mixer 2021 is configured to multiply the extracted noise signal by a preset subcarrier to obtain a first mixed signal;
the pre-stage variable speed module 2022 is used to filter and decimate the first mixed signal.
In the implementation mode, the specific composition structure of the carrier separation module is refined, and the carrier separation of signals is completed, so that each subcarrier works at the rate of 1 time.
In one possible implementation, as shown in fig. 5, the carrier aggregation module 205 includes an adder 2051 and M branches, each branch includes a second mixer 2052 and a post-multistage speed change module 2053, the number of stages of the post-multistage speed change module 2053 is M/2, and M is a positive integer;
the rear multistage speed changing module 2053 is used for performing signal interpolation and filtering on the noise signals subjected to constraint forming;
the second mixer 2052 is configured to multiply the filtered noise signal by a preset subcarrier to obtain a second mixed signal;
the adder 2051 is configured to perform carrier aggregation on each second mixing signal.
In the implementation mode, the specific composition structure of the carrier aggregation module is refined, and the carrier aggregation of the signals is completed, so that the finally synthesized signals are at a high rate.
In one possible implementation, as shown in fig. 4 or fig. 5, each stage of the front multi-stage shift module 2022 includes a Low Pass Filter (LPF) 20221 and a decimator (dec) 20222; each stage of the post-stage shifting module 2053 includes a low pass filter LPF20531 and an Interpolator (INTERP) 20532.
In the implementation mode, the specific structures of the front-mounted multi-stage speed changing module and the rear-mounted multi-stage speed changing module are refined, so that the front-mounted multi-stage speed changing module can filter and extract signals, and the rear-mounted multi-stage speed changing module can insert and filter the signals.
In one possible implementation, as shown in fig. 6, the noise extraction module 201 includes a modulus extraction unit 2011, a peak extraction unit 2012, and a third mixer 2013;
the module taking unit 2011 is configured to take a module value of the original signal to obtain a first module value of the original signal;
the peak extraction unit 2012 is configured to calculate a peak extraction coefficient;
the third mixer 2013 is used to multiply the original signal by the peak extraction coefficient.
In the implementation manner, the composition of the noise extraction module is explained in detail, and the implementation manner of the embodiment of the application is added.
In one possible implementation, as shown in figure 6,
when the first modulus is larger than a preset threshold value, the peak value extraction coefficient is 1-Th/| x |, wherein Th is the preset threshold value, and | x | is the first modulus; when the first modulus is less than or equal to a preset threshold value, the peak extraction coefficient is 0.
It should be noted that the preset threshold may be set according to an actual situation, and is not limited herein.
In the implementation manner, the size of the peak extraction coefficient is limited, the implementation manner of the embodiment of the application is added, and the peak-to-average ratio is reduced under the condition that the Error Vector Magnitude (EVM) or the throughput rate of a user is not changed.
Referring to fig. 7, an embodiment of the present application provides a spatial domain peak clipping method, which is applied to a spatial domain peak clipping device related to the foregoing embodiments and various implementation manners, and includes:
701. a noise signal is extracted from the original signal.
The peak value of the original signal exceeding a preset threshold value is extracted.
It should be noted that, a modulus unit performs modulus extraction on the original signal to obtain a first modulus value, and a peak extraction coefficient is calculated according to a preset threshold value and the first modulus value; and extracting a noise signal according to the peak extraction coefficient.
702. The noise signal is decomposed onto individual carriers.
It should be noted that, when the extracted noise signal is a multi-carrier signal, the down-conversion operation is performed on the extracted signal, the multi-carrier signal is decomposed to each branch of the carrier separation module, and the signal rate of each branch is reduced. Specifically, the signals on each branch are subjected to signal filtering and signal extraction through a first mixer and a preposed multi-stage speed change module. And when the extracted noise signal is a single-carrier signal, one branch is reserved, and the other branches are subjected to shielding operation.
703. And carrying out spatial projection on the noise signals on the various carriers.
Specifically, the extracted noise signal is projected to a common noise space of all user channels in the local carrier.
Note that the matrix of the merged channel characteristics is subtracted from the identity matrix so that the frequency domain operation is converted to the time domain operation.
704. And carrying out spectrum constraint on the projected noise signal.
It should be noted that the projected noise signal does not satisfy the spectrum template, and the spectrum constraint on the noise signal needs to be completed through the shaping filter.
705. And aggregating the noise signals after constraint molding.
It should be noted that, when the noise signal after constraint molding is a multi-carrier signal, the noise signal after constraint molding is subjected to an up-conversion operation to improve the signal rate on each branch, and then the noise signal on each branch is combined into a single-path signal. Specifically, signal interpolation and signal filtering are performed on signals on each branch circuit through a second mixer and a rear multi-stage variable speed module. When the noise signal after constraint molding is a single carrier signal, one branch is reserved, and the other branches are subjected to shielding operation, which is not described herein again specifically.
706. And canceling the delayed original signal and the aggregated noise signal.
It should be noted that, the original signal delayed by the delay module and the aggregated noise signal are canceled. The specific time delay is set according to actual needs, and is not limited here.
In the embodiment of the application, all channel characteristics are combined, the noise space common to all channels is correspondingly calculated, the clipping noise is limited in the common noise space, the operation performed by all resource blocks is the same, independent operation is not required to be performed on each resource block, finally, the frequency domain operation can be converted into time domain operation, and the cost, power consumption and transmission delay of airspace clipping are greatly reduced.
As shown in fig. 8, the performance of the spatial domain clipping device of the present application and the performance of the conventional clipping device are compared and analyzed. Since the peak top capability of the base station power amplifier is fixed, the peak clipping threshold is fixed, so that if a larger power is boosted, more signals are clipped by the peak clipping device, which results in a great reduction of the UE-side reception performance (such as the download rate). As shown in fig. 8, it can be seen that the error vector magnitude EVM on the UE side of the same user equipment is within 3.5, and the clipping performance is improved by about 2db after the spatial clipping apparatus provided by the present application is used.
Compared with the traditional pure time domain clipping, the method and the device have the advantages that under the condition that the amplitude of the user error vector or the throughput rate is not changed, the clipping is performed by 1-2db more, namely, the power finally pushed out by the base station can be increased by 1-2db, and therefore the coverage area of the base station is increased.
It is understood that the method of the embodiment of the present application can be applied to the spatial domain peak clipping device described in the above embodiment and any one of the various implementation manners.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A spatial domain peak clipping device, comprising:
the device comprises a noise extraction module (201), a carrier separation module (202), a noise projection module (203), a noise shaping module (204), a carrier aggregation module (205), a cancellation module (206) and a time delay module (207);
the noise extraction module (201) is used for extracting a part of an original signal exceeding a threshold value and sending the extracted noise signal to the carrier separation module (202);
the carrier separation module (202) decomposes the extracted noise signals to preset subcarriers and sends the mixed noise signals to the noise projection module (203);
the noise projection module (203) is configured to project each mixed noise signal to a public noise space of all user channels in a corresponding subcarrier, and send the projected noise signal to the noise shaping module (204);
the noise shaping module (204) is configured to perform spectrum constraint on the projected noise signal, and send a noise signal shaped by constraint to the carrier aggregation module (205);
the carrier aggregation module (205) is configured to perform carrier aggregation on the constrained and formed noise signal, and send the aggregated noise signal to the cancellation module (206);
the cancellation module (206) is configured to cancel the delayed original signal and the aggregated noise signal;
the time delay module (207) is used for delaying an original signal and sending the delayed original signal to the cancellation module (206).
2. The spatial domain peak clipping device according to claim 1,
the noise projection module (203) comprises a spatial domain compression unit (2031), a spatial domain decompression unit (2032), a cancellation unit (2033) and a time delay unit (2034);
the input end of the airspace compression unit (2031) and the output end of the carrier separation module (202) are electrically connected with the input end of the cancellation unit (2033), the output end of the airspace compression unit (2031) is electrically connected with the input end of the airspace decompression unit (2032), the first input end of the cancellation unit (2033) is electrically connected with the output end of the airspace decompression unit (2032), the second input end of the cancellation unit (2033) is electrically connected with the time delay unit (2034), and the output end of the cancellation unit (2033) is electrically connected with the input end of the noise shaping module (204);
the spatial compression unit (2031) is configured to spatially compress the mixed noise signals from M dimensions to N dimensions through a matrix of M × N, where M and N are positive integers;
the spatial domain decompression unit (2032) is configured to spatially decompress the compressed noise signal from the N-dimension back to the M-dimension through a matrix of N × M;
the cancellation unit (2033) is used for canceling the delayed original signal and the decompressed noise signal;
the time delay unit (2034) is configured to delay the original signal to obtain the delayed original signal.
3. The spatial domain peak clipping device according to claim 1,
the carrier separation module (202) comprises M branches, each branch comprises a first mixer (2021) and a front multistage variable speed module (2022), the number of stages of the front multistage variable speed module (2022) is M/2, and M is a positive integer;
the first mixer (2021) is configured to multiply the extracted noise signal by a preset subcarrier to obtain a first mixed signal;
the front-mounted multi-stage variable speed module (2022) is used for filtering the first mixing signal and extracting a signal.
4. The spatial domain peak clipping device according to claim 1,
the carrier aggregation module (205) comprises an adder (2051) and M branches, each branch comprises a second mixer (2052) and a rear multistage variable speed module (2053), the number of stages of the rear multistage variable speed module (2053) is M/2, and M is a positive integer;
the rear multistage speed changing module (2053) is used for performing signal interpolation and filtering on the noise signals subjected to constraint forming;
the second mixer (2052) is configured to multiply the filtered noise signal by a preset subcarrier to obtain a second mixed signal;
an adder (2051) is used for performing carrier aggregation on each second mixing signal.
5. The spatial domain peak clipping device according to claim 3 or 4,
each stage of said front multistage variable speed module (2022) comprises a low pass filter LPF (20221) and a decimator dec i (20222);
each stage of said rear multistage speed variation module (2053) comprises a low pass filter LPF (20531) and an interpolator INTERP (20532).
6. The spatial domain peak clipping device according to claim 1,
the noise extraction module (201) comprises a modulus extraction unit (2011), a peak extraction unit (2012) and a third mixer (2013);
the modulus taking unit (2011) is used for taking a modulus value of the original signal to obtain a first modulus value of the original signal;
the peak extraction unit (2012) is configured to calculate a peak extraction coefficient;
the third mixer (2013) is configured to multiply the original signal with the peak extraction coefficient.
7. The spatial domain peak clipping device according to claim 6,
when the first modulus is larger than a preset threshold value, the peak extraction coefficient is 1-Th/| x |, wherein Th is the preset threshold value, and | x | is the first modulus;
and when the first modulus is smaller than or equal to the preset threshold value, the peak extraction coefficient is 0.
8. A spatial domain peak clipping method applied to the spatial domain peak clipping apparatus according to any one of claims 1 to 7, the method comprising:
extracting a noise signal from an original signal;
decomposing the noise signal onto respective carriers;
carrying out spatial projection on the noise signals on each carrier;
carrying out spectrum constraint on the projected noise signal;
aggregating the noise signals after constraint molding;
and canceling the delayed original signal and the aggregated noise signal.
9. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of claim 8.
10. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of claim 8.
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| CN101645862A (en) * | 2008-08-04 | 2010-02-10 | 中兴通讯股份有限公司 | Method and device for reducing signal peak-to-average ratio |
| US20100142637A1 (en) * | 2008-12-03 | 2010-06-10 | Nec Laboratories America, Inc. | Transmitter compensation in decoding of intensity modulated optical ofdm with direct detection |
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| CN101068233B (en) * | 2007-07-05 | 2012-01-11 | 华为技术有限公司 | Method and device for reducing signal peak-to-average power ratio |
| CN101764782B (en) * | 2010-03-05 | 2012-07-04 | 上海交通大学 | Method for eliminating interference among carriers based on low-complexity frequency domain linear equalization |
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| US20100142637A1 (en) * | 2008-12-03 | 2010-06-10 | Nec Laboratories America, Inc. | Transmitter compensation in decoding of intensity modulated optical ofdm with direct detection |
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