WO2018058302A1

WO2018058302A1 - Signal clipping method and device

Info

Publication number: WO2018058302A1
Application number: PCT/CN2016/100327
Authority: WO
Inventors: 张烈; 张彬彬; 王健; 葛燕
Original assignee: 华为技术有限公司
Priority date: 2016-09-27
Filing date: 2016-09-27
Publication date: 2018-04-05

Abstract

Embodiments of the invention provide a signal clipping method and device. The signal clipping method comprises: determining n first clipping noise instances according to a first clipping threshold and n first signals, the n first signals being in a one-to-one correspondence relationship with the n first clipping noise instances; performing spatial filtering processing on the n first clipping noise instances to obtain n second clipping noise instances, the spatial filtering processing being used to suppress noise instances of the n first clipping noise instances in a spatial direction of the n first signals; and performing cancellation processing on the n first signals according to the n second clipping noise instances to obtain n second signals. By performing spatial filtering processing on a clipping signal and performing cancellation processing on the signal on the basis of clipping noise instances obtained through the spatial filtering processing, a power amplification output efficiency of a transmitter can be effectively improved. In addition, since the spatial filtering processing effectively suppresses noise instances of the clipping signal in a spatial direction of a signal, the impact of the clipping noise instances on the signal received by a receive end can be greatly reduced.

Description

Signal clipping method and device

Technical field

The present invention relates to the field of communications, and in particular to a signal clipping method and apparatus.

Background technique

Crest Factor Reduction (CFR, also known as clipping) is widely used as a method of power amplifier linearization in conventional transmitters. With the development of Multiple Input Multiple Output (MIMO) technology, multi-antenna multi-channel transmitters have become the evolution direction of the fifth generation (5-Generation, 5G) wireless communication technology. Future MIMO wireless transmitters use multi-beam shaping to increase system capacity and increase system complexity and power consumption. In order to improve the transmission efficiency of multi-antenna transmitters, a clipping method under this architecture is needed.

Summary of the invention

The embodiment of the invention provides a signal clipping method and device, which can improve the transmission efficiency of the multi-antenna transmitter.

In a first aspect, a signal clipping method is provided, including: determining n first clipping noises according to a first clipping threshold and n first signals, the n first signals and the n first One-to-one correspondence of clipping noise, n is an integer greater than 1 and less than or equal to t, t is a preset value; performing spatial filtering processing on the n first clipping noises to obtain n second clipping noises, The spatial filtering process is configured to suppress noise in the airspace direction of the n first clipping noises in the n first clipping noises; and perform the n first signals according to the n second clipping noises For the cancellation process, n second signals are obtained.

Optionally, the first signal is a signal obtained by precoding processing.

By performing spatial filtering processing on the clipping noise and then canceling the transmitted signal according to the clipping noise obtained by the spatial filtering process, the peak-to-average ratio of the signal after the cancellation processing is greatly reduced, so that the output efficiency of the power amplifier is effectively improved, and further Can improve the transmission efficiency of multi-antenna transmitters.

At the same time, since the spatial filtering process effectively suppresses the noise in the spatial direction of the signal in the clipping noise, the signal received by the receiving end can be greatly reduced by the clipping noise.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the pair of the n The first clipping noise is subjected to spatial filtering processing to obtain n second clipping noises, including: calculating a projection matrix of the noise subspaces of the n first signals, using the projection matrix as a spatial domain filter coefficient; The spatial domain filter coefficients perform spatial filtering processing on the n first clipping noises to obtain the n second clipping noises.

The direction of the airspace in which the n first signals are located is the direction of the transmit beam of the n first signals.

Performing spatial filtering processing on the n first clipping noises can be understood as that the n first clipping noises are projected onto the noise subspace of the n first signals, so that clipping noise to the signal can be avoided. Signals in space cause interference.

Optionally, the projection matrix of the noise subspace of the n first signals is obtained by satisfying the following formula:

F=TΛT ^H ,

Where F is the projection matrix of the noise subspace, T is the noise subspace projection transformation vector, Λ is the noise subspace mapping matrix, () ^H is the conjugate transpose, and T can be composed of various orthogonal bases.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the n first clipping noises are subjected to spatial filtering processing according to the spatial domain filter coefficients, The n second clipping noises satisfy the following formula:

S ₁ =FN,

Wherein, S ₁ is n second clipping noise vectors, N is a vector of the n first clipping noises, and F is a projection matrix of the noise subspace.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the method further includes: determining, according to the second clipping threshold and the n second signals n third clipping noises, the n second signals and the n third clipping noises are in one-to-one correspondence; canceling the n second signals according to the n third clipping noises deal with.

By performing time domain clipping on the spatially clipped signal again, a lower PAPR can be obtained, thereby improving the efficiency of the transmitter's RF power amplifier.

Optionally, performing cancellation processing on the n second signals according to the n third clipping noises, including: performing time domain filtering on the n third clipping noises, and obtaining n fourth clipping noises; respectively The n second signals are subjected to cancellation processing according to the n fourth clipping noises.

By performing time domain filtering on the clipping noise, the out-of-band noise can be filtered out, so that the signal spectrum obtained after the cancellation processing satisfies the protocol requirements.

In a second aspect, a signal clipping device is provided, the signal clipping device being configured to perform the first Aspect or the signal clipping method of any of the above possible implementations of the first aspect.

Specifically, the signal clipping device includes: a first determining unit, configured to determine n first clipping noises according to the first clipping threshold and the n first signals, the n first signals and the n One first clipping noise corresponds to one, n is an integer greater than 1 and less than or equal to t, t is a preset value; a spatial filtering unit is configured to determine the n first clippings for the first determining unit Performing a spatial filtering process on the noise to obtain n second clipping noises, wherein the spatial filtering process is for suppressing noise of the n first clipping noises in a spatial direction of the n first signals; And a canceling unit, configured to perform cancellation processing on the n first signals according to the spatial filtering but the obtained n second clipping noises to obtain n second signals.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the spatial domain filtering unit is specifically configured to: calculate a projection matrix of the noise subspaces of the n first signals, and use the projection matrix as a spatial filter coefficient; performing spatial filtering processing on the n first clipping noises according to the spatial domain filter coefficients to obtain the n second clipping noises.

In conjunction with the first possible implementation of the second aspect, in a second possible implementation manner of the first aspect, the n first clipping noises are spatially filtered according to the spatial domain filter coefficients, The n second clipping noises satisfy the following formula:

S ₁ =FN,

With reference to the second aspect or any one of the foregoing possible implementation manners of the second aspect, the third possible implementation manner of the second aspect, further includes: a second determining unit, configured to use the second clipping threshold and the The n second signals determine n third clipping noises, the N second signals and the n third clipping noises are in one-to-one correspondence; the second cancellation unit is configured to determine according to the second The n third clipping noises determined by the unit perform cancellation processing on the N second signals.

In a third aspect, a signal clipping apparatus is provided, comprising a processor for performing the signal clipping method of any of the above-described possible implementations of the first aspect or the first aspect.

Optionally, the method further includes: a memory and a bus system, wherein the processor and the memory are connected by the bus system, the memory is used to store an instruction, the processor is configured to execute the memory stored instruction, and execute The instructions stored in the memory cause the signal clipping device to perform the signal clipping method of any of the above-described possible implementations of the first aspect or the first aspect.

In a fourth aspect, a computer readable storage medium is provided, the computer readable storage medium Storing one or more programs, the one or more programs including instructions that, when executed by the signal clipping device, cause the signal clipping device to perform any of the above-described aspects of the first aspect or the first aspect The signal clipping method described in the implementation manner.

DRAWINGS

1 is a schematic diagram of a MIMO system;

2 is a schematic flow chart of a signal clipping method according to an embodiment of the present invention;

3 is another schematic flowchart of a signal clipping method according to an embodiment of the present invention;

4 is a schematic flowchart of a signal clipping method according to another embodiment of the present invention;

FIG. 5 is a schematic flowchart of a signal clipping method according to another embodiment of the present invention; FIG.

6 is a schematic flowchart of a signal clipping method according to another embodiment of the present invention;

Figure 7 is a schematic block diagram of a signal clipping device in accordance with an embodiment of the present invention;

FIG. 8 is a schematic block diagram of a signal clipping device according to another embodiment of the present invention; FIG.

9 is a schematic block diagram of a signal clipping device in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

The technical solution of the embodiment of the present invention can be applied to various communication systems, such as a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, and a general packet. General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Universal Mobile Telecommunication System (UMTS) or Worldwide Interoperability for Microwave Access (WiMAX) communication system.

1 is a schematic diagram of a MIMO system. As shown in FIG. 1, the transmitting end includes X antennas, and the receiving end includes Y antennas. The X-channel signal at the transmitting end is transmitted through X antennas, and is received by the Y receiving antennas at the receiving end after the spatial channel. Since there is interference between the channels, the signal can be pre-coded at the transmitting end, for example, the signal is forced to zero. Encoding (ie, zero-forcing beamforming) processing, which avoids the effects of interference between channels on the signal.

In addition, since the transmitting end uses the power amplifier to transmit signals, and the signal with peak-to-average ratio reduces the efficiency of the power amplifier and increases the power consumption, the pre-coded signal can be clipped to reduce the peak-to-average power ratio of the signal ( Peak to Average Power Ratio (PAPR), which increases the power and output power of the power amplifier. However, clipping the signal introduces clipping noise into the signal, and the clipping noise can interfere with the signal received at the receiving end. Therefore, the embodiment of the present invention proposes a signal clipping method. By performing spatial filtering processing on the clipping noise, the noise in the direction of the spatial direction of the signal can be suppressed, thereby reducing the influence of the clipping noise on the signal received by the receiving end.

2 is a schematic flow diagram of a signal clipping method 200 in accordance with an embodiment of the present invention. The signal clipping method 100 can be performed by a signal clipping device. Alternatively, the signal clipping device can be a multi-antenna transmitter.

As shown in FIG. 2, the signal clipping method 200 includes the following.

210. Determine, according to the first clipping threshold and the n first signals, n first clipping noises, where the n first signals and the n first clipping noises are in one-to-one correspondence, and n is an integer greater than 1 and less than or equal to t , t is the default value.

For example, comparing the first signal with the first clipping threshold, extracting a portion of the first signal that is higher than the first clipping threshold as the first clipping noise.

The first signal may be a signal obtained by precoding processing. For example, the first signal S ₀ =PS, where S is the signal vector before the precoding process, P is the zero-forcing beamforming matrix, P is determined based on the channel estimation based on the zero-forcing algorithm, and P is the pseudo-inverse of the upstream channel matrix H P = pinv (H), the function pinv () represents the pseudo inverse matrix of the matrix.

Here, the zero-forcing algorithm is used to suppress interference caused by the channel matrix, and a pseudo-inverse matrix of the channel matrix is usually used as the linear filter.

In some embodiments, the value of t may be set according to the system requirements, which is not limited by the embodiment of the present invention.

In some embodiments, t can also be the number of antenna ports.

The antenna port can be a logical port of the transmission channel or a physical antenna port for transmission. The definition of the antenna port can also refer to the related definition in the protocol (for example, 3GPP TS 36.211, or its related and evolving standards, such as the future 5G standard), which is not limited by the embodiment of the present invention.

220. performing spatial filtering processing on the n first clipping noises to obtain n second clipping noises, where the spatial domain filtering processing is used to suppress the air direction of the n first clipping noises in the n first signals. The noise on it.

The direction of the airspace in which the n first signals are located is the direction of the transmit beam of the n first signals. Each first clipping noise causes interference with each of the n first signals.

After performing spatial filtering on the n first clipping noises, noise of n first clipping noises in the spatial direction of the n first signals can be suppressed, that is, n first clipping noises can be avoided. Any of the first signals in a signal causes interference, i.e., the effect of clipping noise on the signal can be suppressed.

230. Perform cancellation processing on the n first signals according to the n second clipping noises respectively, to obtain n second signals.

After the cancellation process, the peak-to-average ratio of the signal can be reduced, thereby improving the transmission efficiency of the transmitter.

As shown in FIG. 3, noise extraction processing is performed on n signals respectively to obtain n clipping noises; spatial filtering processing is performed on the n clipping noises; and then each clipping noise obtained by spatial filtering processing is respectively The corresponding delayed signals are subjected to cancellation processing to complete the clipping processing. For convenience of description, the clipping process is hereinafter referred to as spatial clipping processing.

In the embodiment of the present invention, by performing spatial filtering processing on the clipping noise, and then canceling the signal according to the clipping noise obtained by the spatial filtering process, the peak-to-average ratio of the signal after the cancellation processing is greatly reduced, thereby making the output efficiency of the power amplifier Get an effective boost. At the same time, since the spatial filtering process effectively suppresses the noise in the spatial direction of the signal in the clipping noise, the signal received by the receiving end can be greatly reduced by the clipping noise.

Optionally, spatially filtering the n first clipping noises in 220, and obtaining n second clipping noises includes:

Calculating a projection matrix of noise subspaces of the n first signals, using the projection matrix as a spatial domain filter coefficient;

The n first clipping noises are subjected to spatial filtering processing according to the spatial domain filter coefficients to obtain n second clipping noises.

Specifically, a projection matrix (ie, a spatial domain filter coefficient) of the noise subspace of the n first signals may be determined according to the channel information, where the channel information is information of a channel for transmitting the n first signals.

The channel information may be channel information under a multi-beam shaping architecture, and the antenna multi-beam shaping includes all-digital shaping, full analog shaping, and digital plus analog hybrid shaping. The channel information can be determined by channel estimation.

The signal space may include signal subspaces and noise subspaces that are orthogonal to each other. It should be noted that the noise subspace is not determined by noise, but by the signal. The projection of the signal in the signal subspace is greatest, and the projection of the signal in the noise subspace is zero.

For the process of determining the projection matrix of the noise subspace of the n first signals, reference may be made to the related content of the prior art, which is not limited by the embodiment of the present invention.

For example, the projection matrix of the noise subspace of the n first signals can be obtained by the following formula:

F=TΛT ^H ,

The Λ can be determined according to the channel information. For a specific process, reference may be made to the related process in the prior art, and the corresponding description is omitted herein.

The spatial filtering processing of the N first clipping noises according to the spatial domain filter coefficients can be understood as: projecting n first clipping noises onto the noise subspace of the n first signals.

Alternatively, the obtained n second clipping noises can satisfy the following formula:

S ₁ =FN,

Where S ₁ is a vector of n second clipping noises, N is a vector of n first clipping noises, and F is a projection matrix of the noise subspace.

Projecting the clipping noise onto the noise subspace can suppress the interference of the clipping noise on the signal, that is, eliminate the interference of the clipping noise beam on the user beam.

In step 230, the process of performing the cancellation processing on the n first signals according to the n second clipping noises may refer to the related content of the signal cancellation in the prior art, which is not limited in the embodiment of the present invention.

For example, the first signal can be subtracted from its corresponding second clipping noise to obtain a second signal.

Correspondingly, performing n cancellation processing on the n first signals according to the n second clipping noises to obtain n second signals may include: obtaining n second signals according to the following formula:

S'=S ₀ -S ₁

Where S' is a vector of n second signals, S ₀ is a vector of n first signals, and S ₁ is a vector of n second clipping noises.

In the embodiment of the present invention, in order to suppress the interference of the clipping noise on the signal received by the signal end, by using the idea of the zero-forcing algorithm, the interference of the clipping noise on the signal received by the signal end is subjected to zero-forcing processing, that is, the clipping noise projection To the noise subspace of the signal, it is possible to avoid clipping noise to the signal sub Signals in space cause interference.

Optionally, after 220, the method 200 may further include performing out-of-band suppression processing on the n second clipping noises respectively to suppress out-of-band noise of the n clipping noises.

Specifically, the out-of-band rejection processing is to perform zero-setting processing on the out-of-band noise of the n second clipping noises.

It should be understood that the signal clipping method according to the embodiment of the present invention may perform clipping processing on the baseband signal, and may also perform clipping processing on the intermediate frequency processed intermediate frequency signal. In other words, the first signal in method 200 can be a baseband signal or an intermediate frequency signal.

Optionally, the method 200 may further include:

Determining n third clipping noises according to the second clipping threshold and the n second signals, wherein the n second signals are respectively corresponding to the n third clipping noises;

The n second signals are subjected to cancellation processing according to the n third clipping noises, respectively.

Optionally, the n second signals are respectively cancelled according to the n third clipping noises, including:

Performing time domain filtering processing on the n third clipping noises to obtain n fourth clipping noises;

The n second signals are subjected to cancellation processing according to n fourth clipping noises, respectively.

As shown in FIG. 4, the n signals obtained by the spatial clipping process are separately subjected to noise extraction processing to obtain n clipping noises; respectively, the n clipping noises are subjected to time domain filtering processing; and then the time domain filtering is performed. Each of the clipping noises is subjected to cancellation processing on the respective delayed signals, and the clipping processing is completed. For convenience of description, the clipping process is hereinafter referred to as time domain clipping processing.

It should be understood that, in the embodiment of the present invention, the time-domain clipping process may be performed on the signal after the air-wave clipping process to obtain a lower PAPR.

A signal clipping method according to an embodiment of the present invention will be described below by taking an OFDM signal as an example with reference to FIGS. 5 and 6.

Assuming that the input signal is an OFDM signal, it should be noted that the input signal may be a baseband OFDM signal generated by precoding, Inverse Fast Fourier Transform (IFFT) and Cyclic Prefix (CP). The intermediate frequency OFDM signal processed by the intermediate frequency is also not limited in this embodiment of the present invention. Among them, the intermediate frequency processing can Including shaping filtering and upsampling processing, shaping and filtering the signal can reduce the out-of-band noise of the signal, and up-sampling the signal can improve the processing rate of the signal.

First, the channel estimation processing module extracts a downlink channel model under a multi-beam shaping architecture, and obtains a precoding parameter, calculates a projection matrix of the noise subspace of the signal according to the precoding parameter, and transmits the projection matrix as a spatial domain filter coefficient. Intermediate frequency processing. Here, the antenna multi-beam shaping supports full digital shaping, full analog shaping, and digital plus analog hybrid shaping.

501, performing clipping noise extraction processing on the n input signals respectively, and acquiring n clipping noises;

502. Perform de-CP and Fast Fourier Transform (FFT) transform processing on the n clipping noises respectively to obtain N clipping noises in the frequency domain;

503. Perform spatial domain filtering processing on n clipping noises in the frequency domain;

504. Perform nFFT transformation and CP processing on the n clipping noises obtained after the spatial domain filtering process respectively.

505: Perform noise cancellation processing on each of the n signals obtained by the IFFT transform and the CP processing, and the corresponding delayed signals, respectively, to complete the airspace clipping processing;

506. Perform time domain clipping processing on the signal after the airshed clipping process, and complete all clipping processing. The time domain clipping process can be referred to FIG. 4, and details are not described herein again.

Optionally, if the input signal is an intermediate frequency OFDM signal obtained by the intermediate frequency processing, as shown in FIG. 6, after the input signal is subjected to noise extraction processing to obtain clipping noise, the clipping noise may also be downsampled; Correspondingly, the clipping noise obtained by the spatial domain filtering is upsampled before the noise cancellation.

The signal clipping method according to an embodiment of the present invention has been described above, and a signal clipping device according to an embodiment of the present invention will be described below with reference to FIGS. 7 to 9.

FIG. 7 is a schematic block diagram of a signal clipping device 700 in accordance with an embodiment of the present invention. As shown in FIG. 7, the signal clipping device 700 includes a first determining unit 710, a spatial filtering unit 720, and a first cancellation unit 730.

The first determining unit 710 is configured to determine n first clipping noises according to the first clipping threshold and the n first signals, where the n first signals and the n first clipping noises are in one-to-one correspondence, and n is greater than 1 and an integer less than or equal to t, t is a preset value.

The spatial filtering unit 720 is configured to perform spatial filtering processing on the n first clipping noises determined by the first determining unit to obtain n second clipping noises, and the spatial filtering processing is used to suppress n first clipping noises in n The noise in the direction of the airspace where the first signal is located.

The first cancellation unit 730 is configured to perform cancellation processing on the n first signals according to the n second clipping noises obtained by the spatial filtering unit to obtain n second signals.

In the embodiment of the present invention, by performing spatial filtering processing on the clipping noise, and then canceling the signal according to the clipping noise obtained by the spatial filtering process, the peak-to-average ratio of the signal after the cancellation processing is greatly reduced, thereby making the output efficiency of the power amplifier Get an effective boost.

Optionally, the spatial domain filtering unit 720 is specifically configured to:

The n first clipping noises are spatially filtered according to the spatial domain filter coefficients to obtain n second clipping noises.

Optionally, performing spatial filtering processing on the n first clipping noises according to the spatial domain filter coefficients, to obtain that the n second clipping noises satisfy the following formula:

S ₁ =FN,

Specifically, F=TΛT ^H , T is a noise subspace projection transformation vector, Λ is a noise subspace mapping diagonal matrix, () ^H represents a conjugate transpose, and T can be composed of various orthogonal bases.

Optionally, as shown in FIG. 8, the signal clipping device 700 may further include:

The second determining unit 740 is configured to determine, according to the second clipping threshold and the n second signals obtained by the first cancellation unit 730, n third clipping noises, n second signals, and n third clipping noises One-to-one correspondence;

The second cancellation unit 750 is configured to perform cancellation processing on the n second signals according to the n third clipping noises determined by the second determining unit 740.

Alternatively, the signal clipping device 700 may be a multi-antenna transmitter, and the signal clipping device 700 may further include a transmitting unit for transmitting signals.

It should be noted that, in the embodiment of the present invention, the first determining unit 710, the spatial domain filtering unit 720, the first cancellation unit 730, the second determining unit 740, and the second cancellation unit 750 may be implemented by a processor. As shown in FIG. 9, a signal clipping device 900 according to another embodiment of the present invention may include a processor 910.

Alternatively, the signal clipping device 900 may further include a memory 920 and a bus system 930, and the processor 910 and the memory 920 are connected by a bus system 930. The memory 920 is used to store instructions or code or the like executed by the processor 910. The bus system 930 includes a power bus, a control bus, and a status signal bus in addition to the data bus.

Optionally, the signal clipping device 900 can also include a transmitter 940 for transmitting signals.

The signal clipping device 700 shown in FIG. 7 or FIG. 8 or the signal clipping device 900 shown in FIG. 9 can implement the various processes performed by the signal clipping device in the foregoing method embodiments. To avoid repetition, no further description is provided herein. .

It should be noted that the above described method embodiments of the present invention may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It is to be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory. The volatile memory can be a Random Access Memory (RAM) that acts as an external cache. By way of illustration and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (Dynamic) RAM, DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM) ESDRAM), synchronous connection of dynamic random access memory (Synchlink DRAM, SLDRAM) and direct memory bus random access memory (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of cells is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. Go to another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or software. The form of the functional unit is implemented.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave. Then, coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated medium. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

In conclusion, the above is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A signal clipping method, comprising:

Determining n first clipping noises according to the first clipping threshold and the n first signals, wherein the n first signals are in one-to-one correspondence with the n first clipping noises, and n is greater than 1 and less than or equal to t Integer, t is the default value;

Performing spatial filtering processing on the n first clipping noises to obtain n second clipping noises, where the spatial domain filtering processing is used to suppress the n first clipping noises at the n first signals Noise in the direction of the airspace;

And canceling the n first signals according to the n second clipping noises to obtain n second signals.
The signal clipping method according to claim 1, wherein the performing spatial filtering processing on the n first clipping noises to obtain n second clipping noises comprises:

Calculating a projection matrix of the noise subspaces of the n first signals, and using the projection matrix as a spatial domain filter coefficient;

Performing spatial filtering processing on the n first clipping noises according to the spatial domain filter coefficients to obtain the n second clipping noises.
The signal clipping method according to claim 2, wherein said spatially filtering said n first clipping noises according to said spatial domain filter coefficients to obtain said n second clipping noises , satisfy the following formula:

S 1 =FN,

Wherein, S 1 is a vector of the n second clipping noises, N is a vector of the n first clipping noises, and F is a projection matrix of the noise subspace.
The signal clipping method according to any one of claims 1 to 3, further comprising:

Determining n third clipping noises according to the second clipping threshold and the n second signals, wherein the n second signals and the n third clipping noises are in one-to-one correspondence;

And canceling the n second signals according to the n third clipping noises.
A signal clipping device, comprising:

a first determining unit, configured to determine n first cuts according to the first clipping threshold and the n first signals Wave noise, the n first signals and the n first clipping noises are in one-to-one correspondence, n is an integer greater than 1 and less than or equal to t, and t is a preset value;

a spatial filtering unit configured to perform spatial filtering processing on the n first clipping noises determined by the first determining unit to obtain n second clipping noises, where the spatial filtering processing is used to suppress the n Noise of the first clipping noise in the spatial direction of the n first signals;

The first cancellation unit is configured to perform cancellation processing on the n first signals according to the n second clipping noises obtained by the spatial filtering unit to obtain n second signals.
The signal clipping device according to claim 5, wherein the spatial filtering unit is specifically configured to:

Calculating a projection matrix of the noise subspaces of the n first signals, using the projection matrix as a spatial domain filter coefficient;

Performing spatial filtering processing on the n first clipping noises according to the spatial domain filter coefficients to obtain the n second clipping noises.
The signal clipping device according to claim 6, wherein the n first clipping noises are subjected to spatial filtering processing according to the spatial domain filter coefficients, to obtain that the n second clipping noises satisfy the following formula:

S 1 =FN,

Wherein, S 1 is a vector of the n second clipping noises, N is a vector of the n first clipping noises, and F is a projection matrix of the noise subspace.
The signal clipping device according to any one of claims 5 to 7, further comprising:

a second determining unit, configured to determine n third clipping noises according to the second clipping threshold and the n second signals obtained by the first cancellation unit, the n second signals and the n One third clipping noise corresponds to one;

a second cancellation unit, configured to perform cancellation processing on the n second signals according to the n third clipping noises determined by the second determining unit.