CN115695115A

CN115695115A - Direct current elimination method and device, chip and module equipment

Info

Publication number: CN115695115A
Application number: CN202211398243.6A
Authority: CN
Inventors: 薛丰廷
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-02-03

Abstract

The application discloses a direct current elimination method, a direct current elimination device, a chip and module equipment, wherein the method comprises the following steps: determining a first Resource Element (RE) located at the center frequency point of a first Resource Block (RB); determining a target signal strength based on signal strengths of a plurality of second resource elements, wherein a port corresponding to a first resource element and a port corresponding to a second resource element are located in the same CDM group, and the first resource element and the second resource element are located in the same symbol in a first RB; and updating the signal strength of the first resource element to the target signal strength so as to remove the direct current on the first resource element. The method and the device are favorable for improving the effect of eliminating the direct current and improving the adjustment performance of the downlink data.

Description

Direct current elimination method and device, chip and module equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a dc cancellation method and apparatus, a chip, and a module device.

Background

In wireless communication, a Direct Current (DC) having a large signal strength may exist at a center frequency point of reception. When there is DC in the central frequency point, the effective signal will be submerged, thereby affecting the demodulation performance of the downlink data. The existing method for eliminating DC is to calculate an average value of the data signal strength received by the current frame, and subtract DC at the center frequency point of the next frame based on the average value to counteract the influence caused by DC. However, the method cannot eliminate the DC influence on the current frame, and in actual wireless communication, a wireless channel changes instantaneously, and the DC in the next frame changes suddenly due to various reasons, so that the DC elimination effect is poor, and the adjustment performance of downlink data is low.

Disclosure of Invention

The application provides a direct current elimination method, a direct current elimination device, a chip and module equipment, which are beneficial to improving the direct current elimination effect and improving the adjustment performance of downlink data.

In a first aspect, the present application provides a dc cancellation method, applied to a terminal device, where the method includes: determining a first Resource Element (RE) located at a center frequency point of a first Resource Block (RB); determining a target signal strength based on signal strengths of a plurality of second REs, ports corresponding to the first REs being located in a same (CDM) group as ports corresponding to the second REs, and the first REs and the second REs being located in a same symbol in the first RB; and updating the signal strength of the first RE to the target signal strength so as to remove the direct current on the first RE.

The target signal strength of the first RE is presumed through the second RE located in the first RB, so that the relevance between the target signal strength and the first RB is stronger, the second RE and the first RE are located in the same symbol, the target signal strength is more real-time, the effect of direct current elimination is better, and the adjustment performance of downlink data is improved.

In one possible implementation, determining the target signal strength based on the signal strengths of the plurality of second REs includes: determining a weighted sum of the signal strengths of the plurality of second REs as a target signal strength.

In one possible implementation, the target signal strength CE (REdc) satisfies the following equation:

wherein N is the number of second REs, coeff _i Weights corresponding to the ith second RE, CE (RE) _i ) The signal strength corresponding to the ith second RE.

In a possible implementation manner, the weight corresponding to the xth second RE is greater than the weight corresponding to the yth second RE, and the frequency-domain distance between the xth second RE and the first RE is farther than the frequency-domain distance between the yth second RE and the first RE.

Since the second RE closer to the first RE in the frequency domain has a large influence on the signal strength of the first RE and, conversely, the second RE farther from the first RE in the frequency domain has a small influence on the signal strength of the first RE, the smaller the weight corresponding to the second RE closer to the first RE in the frequency domain, the larger the weight corresponding to the second RE farther from the first RE in the frequency domain, so that the influences of the second REs having different frequency domain distances are balanced.

In a possible implementation manner, before determining the first RE located at the center frequency of the first resource block RB, the method further includes: determining the offset between the initial frequency domain position of the first resource block and the 0 frequency point, wherein the initial frequency domain position of the first resource block is the frequency domain position which is closest to the 0 frequency point in the first resource block; and determining the position of the central frequency point of the first resource block based on the offset and the width of half of the first resource block.

The position of the central frequency point of the first resource block can be accurately determined through the offset and the width of half of the first resource block.

In one possible implementation, the center frequency point position dc _ re _ index satisfies the following formula: dc _ re _ index = PRB _ offset + activeBWP _ size × 6, where PRB _ offset is the offset between the starting point of the first resource block and the 0 bin, and activeBWP _ size is the width of one subcarrier.

In one possible implementation, a group CDM group includes two ports specified by a protocol.

In a second aspect, the present application provides a dc removal apparatus comprising means for performing the method of the first aspect.

In a third aspect, the present application provides a chip comprising a processor and a communication interface, the processor being configured to cause the chip to perform the method of the first aspect.

In a fourth aspect, the present application provides a module device, which includes a communication module, a power module, a storage module, and a chip, wherein: the power module is used for providing electric energy for the module equipment; the storage module is used for storing data and instructions; the communication module is used for carrying out internal communication of the module equipment or is used for carrying out communication between the module equipment and external equipment; the chip is adapted to perform the method of the first aspect.

In a fifth aspect, an embodiment of the present application discloses a terminal device, where the terminal device includes a memory and a processor, the memory is used for storing a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to the first aspect.

In a sixth aspect, the present application provides a computer-readable storage medium having computer-readable instructions stored thereon, which, when run on a communication device, cause the communication device to perform the method of the first aspect.

In a seventh aspect, the present application provides a computer program or computer program product comprising code or instructions which, when run on a computer, cause the computer to perform the method according to the first aspect as described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic flowchart of a dc cancellation method according to an embodiment of the present application;

fig. 2 is a schematic diagram of a resource block RB provided in an embodiment of the present application;

fig. 3 is a schematic diagram of a resource element RE according to an embodiment of the present application;

fig. 4 is a schematic diagram of another resource element RE provided in an embodiment of the present application;

fig. 5 is a schematic diagram of signal strength before and after dc cancellation according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a dc removing device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a module apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the listed items.

It should be noted that the terms "first," "second," "third," and the like in the description and claims of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than described or illustrated herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunication system (universal mobile telecommunication system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (generation, or new radio (UMTS) system, and future communication systems.

In order to facilitate understanding of the solutions provided in the embodiments of the present application, some terms of art related to the present application are described below:

1. terminal device

The terminal device includes a device for providing voice and/or data connectivity to a user, for example, the terminal device is a device with wireless transceiving function, and can be deployed on land, including indoors or outdoors, hand-held, worn or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal device, a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in wearable home (smart home), a terminal device, and the like. The embodiments of the present application do not limit the application scenarios. A terminal may also be referred to as a terminal device, user Equipment (UE), access terminal device, in-vehicle terminal, industrial control terminal, UE unit, UE station, mobile station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, or UE device, among others. The terminals may also be fixed or mobile. In this embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system or a combined device and a component that can implement the function of the terminal device, and the apparatus may be installed in the terminal device.

2. Demodulation reference signals (DMRS)

DMRS is UE-specific for estimating radio channels. DMRSs are widely mapped to important physical channels, for example, DMRSs may be used to demodulate a downlink Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH). The most important role of DM-RS is demodulation (demodulation) for each physical channel. Wherein, the physical downlink shared channel is used for carrying data from a transmission channel DSCH. When demodulating downlink data, the DMRS mainly has the following effects: measuring channel state information, demodulating data, training beams, tracking time-frequency parameters and the like; when demodulating uplink data, DMRS mainly plays a role in: uplink and downlink channel measurement, data demodulation and the like.

3. Code Division Multiplexing (CDM)

Code division multiplexing refers to a communication method in which multiplexing is achieved by utilizing orthogonality of the signal pattern structures of respective channels. The code division multiplexing is mainly used for wireless communication systems, particularly mobile communication systems. It can not only improve the voice quality and data transmission reliability of communication and reduce the influence of interference on communication, but also increase the capacity of communication system. In contrast to Frequency-Division Multiplexing (FDM) and Time-Division Multiplexing (TDM), CDM shares both Frequency and Time of channels. Code division multiplexing is also a method for sharing channels, each user can use the same frequency band to communicate at the same time, but a method for dividing channels based on code patterns is used, namely, each user is allocated with an address code, the code patterns are not overlapped, communication parties cannot interfere with each other, and the anti-interference capability is strong. Code division multiplexing is mainly used in wireless communication systems, particularly mobile communication systems.

In order to improve the effect of dc cancellation and improve the adjustment performance of downlink data, the present application provides a dc cancellation method, apparatus, chip, and module device. The dc cancellation, the dc cancellation apparatus, the dc cancellation chip and the module device provided in the embodiments of the present application are further described in detail below.

Referring to fig. 1, fig. 1 is a flowchart of a dc cancellation method according to an embodiment of the present application, where the dc cancellation method includes steps 101 to 103. The main body of the method shown in fig. 1 may be a terminal device, and the terminal device may refer to the description of the terminal device. The embodiments of the present application do not limit the execution subject of the method uniquely, and the corresponding execution subject may also be any device, chip or software module capable of providing the method, or a combination thereof. For convenience of the following description, the main body of the method shown in fig. 1 is a terminal device as an example. Wherein:

101. the terminal equipment determines a first RE located at the center frequency point of the first RB.

To better understand the relationship between the first RB and the first RE, the RB and RE are further explained below. Referring to fig. 2, the whole frame marked by 201 in fig. 2 is an RB, which occupies 7 symbols in time domain (7 positions in abscissa as shown in fig. 2), 12 subcarriers in frequency (12 positions in ordinate as shown in fig. 2), 203 is a subcarrier, and 204 is a symbol. The box marked by 202 is an RE, and it can be seen that one RB includes 7 × 12 REs, and one symbol in one RB corresponds to 12 REs. The center frequency point is the middle position of the band, such as the middle position of an RB in the frequency domain.

The method for determining the position of the center frequency point of the first RB may have the following two manners, which are explained below.

In a first mode, if the terminal device does not determine the end position of the first RB, before the terminal device determines the first RE located at the center frequency point position of the first RB, the terminal device may further determine the offset between the start frequency domain position of the first RB and the 0 frequency point, where the start frequency domain position of the first RB is the frequency domain position closest to the 0 frequency point in the first RB; and determining the position of the central frequency point of the first RB based on the offset and the width of half of the first RB.

The offset between the starting frequency domain position of the first RB and the 0 bin is an offset in the frequency domain (as shown in fig. 2, the distance between the frequency corresponding to the lowest edge of RB201 and the 0 bin), for example, if the frequency corresponding to the starting frequency domain position of the first RB is 1000hz, and the frequency corresponding to the 0 bin is 0HZ, the offset between the starting frequency domain position of the first RB and the 0 bin is 1000HZ.

Where half the width of the first RB is 6 subcarriers, and the width of one subcarrier is 15KHZ, then half the width of the first RB is 6 × 15=90khz.

In one possible embodiment, the center bin position dc _ re _ index satisfies the following formula: dc _ re _ index = PRB _ offset + activeBWP _ size × (6), where PRB _ offset is the offset between the starting point of the first RB and the frequency bin 0, and activeBWP _ size is the width of one subcarrier.

Wherein the width of one subcarrier is as indicated by 203 in fig. 2.

Exemplarily, the offset between the starting frequency domain position of the first RB and the frequency point 0 is 20KHZ, and the width of one subcarrier is 15KHZ, then the position of the central frequency point in this case is 20khz +6 + 15khz =110khz based on the above formula. Therefore, the position of the central frequency point of the first RB is accurately determined.

And in the second mode, the terminal equipment directly determines the position of the central frequency point of the first RB based on the initial position and the end position of the first RB on the frequency domain.

Illustratively, the starting frequency domain position of the first RB is 10KHZ, the ending frequency domain position of the first RB is 100KHZ, and the center frequency domain position of the first RB is (10khz + 100khz)/2 =55khz.

Illustratively, the starting frequency domain position of the first RB is 0KHZ, the ending frequency domain position of the first RB is 100KHZ, and the center frequency domain position of the first RB is (0 KHZ + 100khz)/2 =50khz. Therefore, the position of the center frequency point of the first RB can be quickly determined.

102. The terminal device determines a target signal strength based on signal strengths of a plurality of second REs, wherein a port corresponding to the first RE is located in the same CDM group as a port corresponding to the second RE, and the first RE and the second RE are located in the same symbol in the first RB.

Wherein, the first RE and the second RE are located in the same symbol in the first RB, as shown in fig. 3, fig. 3 shows 12 REs corresponding to one symbol in the RB, and it can be understood that fig. 3 shows a column corresponding to symbol 204 in RB201 in fig. 2. REs within different color boxes represent received from ports in different CDM groups. In one possible embodiment, a set of CDM groups includes two ports specified by a protocol.

Illustratively, CDM group 1 includes port 0 and port 1, and CDM group 2 includes port 2 and port 3. As shown in fig. 3, the light colored RE is: RE0, RE2, RE4, RE6, RE8, RE10, the light RE being data received by CDM group 1 (port 0 and port 1); the dark RE is: RE1, RE3, RE5, RE7, RE9, RE11, the light colored REs are all data received by CDM group 2 (port 2 and port 3). If the first RE is RE0, the second RE is RE2, RE4, RE6, RE8, RE10; similarly, if the first RE is RE1, the second RE is RE3, RE5, RE7, RE9, RE11.

In a possible embodiment, the terminal device determines the target signal strength based on the signal strengths of the plurality of second REs, specifically: the terminal device determines a weighted sum of the signal strengths of the plurality of second REs as a target signal strength.

For example, as shown in fig. 3, if RE6 is a first RE, the plurality of second REs are: RE0, RE2, RE4, RE8, RE10, the target signal strength is a weighted sum of the signal strengths of RE0, RE2, RE4, RE8, RE 10. Similarly, if RE7 is the first RE, the plurality of second REs are: RE1, RE3, RE5, RE9, RE11, the target signal strength is the weighted sum of the signal strengths of RE1, RE3, RE5, RE9, RE11.

In one possible embodiment, the target signal strength CE (REdc) satisfies the following equation:

For example, as shown in fig. 3, when RE6 is the first RE, there are 5 second REs, and N is 5.Coeff _i The weight values are preset multiple weight values.

The RB on one symbol shown in fig. 3 includes only two REs received by CDM group, that is, includes only four ports of received REs. In another implementation, as shown in fig. 4, an RB on one symbol may further include three received REs in CDM group, that is, may include six received REs on ports, and as shown in fig. 4, the lightest RE is: RE0, RE1, RE6, RE7; the color-centered RE is: RE2, RE3, RE8, RE9; the darkest RE is: RE4, RE5, RE10, RE11. The lightest colored REs are data received by CDM group 1 (port 0 and port 1); the color-centered REs are data received by CDM group 2 (port 2 and port 3); the darkest colored REs are data received by CDM group 3 (port 4 and port 5).

In one possible embodiment, when the first RE and the second RE are used for transmitting DMRSs, if the DMRS is DMRS type1, an RB on one symbol includes only two CDM group-received REs (as shown in fig. 3), and if the DMRS is DMRS type2, an RB on the first symbol includes three CDM group-received REs (as shown in fig. 4). It should be noted that DMRS is only RE received in the same CDM group.

For example, as shown in fig. 4, if RE5 is a first resource element, the plurality of second resource elements are: RE4, RE10, RE11, the target signal strength is the weighted sum of the signal strengths of RE4, RE10, RE11. Similarly, if RE6 is the first resource element, the plurality of second resource elements are: RE0, RE1, RE7, the target signal strength is the weighted sum of the signal strengths of RE0, RE1, RE 7.

In a possible embodiment, the weight corresponding to the xth second RE is greater than the weight corresponding to the yth second RE, and the frequency-domain distance between the xth second RE and the first RE is farther than the frequency-domain distance between the yth second RE and the first RE.

That is, the weight corresponding to the second RE closer to the first RE in the frequency domain is smaller, whereas the weight corresponding to the second RE farther from the first RE in the frequency domain is larger. Since the second REs closer to the frequency domain of the first RE have a greater influence on the signal strength of the first RE, the weights corresponding to the second REs closer to the frequency domain of the first RE are smaller, whereas since the second REs further from the frequency domain of the first RE have a smaller influence on the signal strength of the first RE, the weights corresponding to the second REs further from the frequency domain of the first RE are larger, so that the influences of the second REs different in frequency domain distance are balanced.

For example, as shown in fig. 3, if RE6 is a first RE, the plurality of second REs are: RE0, RE2, RE4, RE8, RE10, the weights corresponding to the 5 second REs are Coeff respectively ₀ 、Coeff ₂ 、Coeff ₄ 、Coeff ₈ 、Coeff ₁₀ . Where RE8 and RE4 are two second REs closest to the first RE (RE 6), so the Coeff corresponding to RE8 and RE4 ₄ And Coeff ₈ Is the smallest weight; where RE8 and RE4 are two second REs second closest to the first RE (RE 6), therefore RE10 and RE2 correspond to Coeff ₁₀ And Coeff ₂ The second smallest weight; where RE0 is the second RE farthest from the first RE (RE 6), so RE0 corresponds to Coeff ₀ Is the largest weight. It should be noted that the weights corresponding to the second REs having the same frequency-domain distance between the first REs may be the same or different, and as described above, the Coeff corresponding to RE8 and RE4 ₄ And Coeff ₈ May be the same or different and are not limited herein.

For example, as shown in fig. 3, if RE0 is the first RE, the plurality of second REs are: RE2, RE4, RE8,RE6 and RE10, the weight corresponding to the 5 second REs is Coeff ₂ 、Coeff ₄ 、Coeff ₆ 、Coeff ₈ 、Coeff ₁₀ . Wherein the frequency domain distances between the 5 second REs and RE0 are arranged from near to far as: RE2, RE4, RE8, RE6, RE10, their corresponding weights are arranged from small to large as: coeff ₂ 、Coeff ₄ 、Coeff ₆ 、Coeff ₈ 、Coeff ₁₀ 。

For example, as shown in fig. 4, if RE5 is the first RE, the plurality of second REs are: RE4, RE10, RE11, the 3 second REs have the corresponding weights of Coeff ₄ 、Coeff ₁₀ 、Coeff ₁₁ . Wherein the frequency domain distances between the 3 second REs and RE5 are arranged from near to far as: RE4, RE10, RE11. So its corresponding weights are arranged from small to large as: coeff ₄ 、Coeff ₁₀ 、Coeff ₁₁ 。

In one possible embodiment, the first resource block is located in the PDSCH, which may be used to transmit the DMRS, at which time the first RE and the plurality of second REs may carry the DMRS. Note that the PDSCH may have a plurality of resource blocks, and is not limited to the first resource block.

103. And the terminal equipment updates the signal intensity of the first RE to the target signal intensity so as to remove the direct current on the first RE.

And the target signal intensity is smaller than the signal intensity corresponding to the direct current. For example, as shown in fig. 5, one DC exists at the center frequency point position 501 in fig. 5, and as can be seen from fig. 5, the signal strength of this DC is much greater than the signal strengths of the rest frequency point positions, and after the signal strength of the first RE (center frequency point position) is updated to the target signal strength, as can be seen from 502 in fig. 5, it can be seen that there is no DC in the updated 502.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a dc cancellation apparatus according to an embodiment of the present invention, where the dc cancellation apparatus may be a terminal device or an apparatus (e.g., a chip) having a function of the terminal device. Specifically, as shown in fig. 3, the dc removing apparatus 600 may include:

a determining unit 601, configured to determine a first RE located at a center frequency point of a first resource block RB;

the determining unit 601 is further configured to determine a target signal strength based on signal strengths of a plurality of second REs, where a port corresponding to a first RE and a port corresponding to a second RE are located in the same CDM group, and the first RE and the second RE are located in the same symbol in the first RB;

an updating unit 602, configured to update the signal strength of the first RE to a target signal strength to remove the direct current on the first RE.

In a possible implementation, the determining unit 601 is further configured to determine a weighted sum of the signal strengths of the plurality of second REs as the target signal strength.

In a possible implementation, the weight corresponding to the xth second RE is greater than the weight corresponding to the yth second RE, and the frequency-domain distance between the xth second RE and the first RE is farther than the frequency-domain distance between the yth second RE and the first RE.

In a possible implementation, the determining unit 601 may be further configured to, before determining the first RE located in the center frequency position of the first resource block RB: determining the offset between the initial frequency domain position of the first resource block and the 0 frequency point, wherein the initial frequency domain position of the first resource block is the frequency domain position closest to the 0 frequency point in the first resource block; and determining the position of the central frequency point of the first resource block based on the offset and the width of half of the first resource block.

In one possible implementation, the center bin position dc _ re _ index satisfies the following equation: dc _ re _ index = PRB _ offset + activeBWP _ size × 6, where PRB _ offset is the offset between the starting point of the first resource block and the 0 bin, and activeBWP _ size is the width of one subcarrier.

In one possible implementation, a group CDM group comprises two ports specified by a protocol.

The embodiment of the application also provides a chip, and the chip can execute the relevant steps of the terminal device in the embodiment of the method. The chip comprises a processor and a communication interface, wherein the processor is configured to enable the chip to execute the method of implementing the method embodiment described above and illustrated in fig. 1.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device 700 may include a memory 701, a processor 702. Optionally, a communication interface 703 is also included. The memory 701, processor 702, and communication interface 703 are connected by one or more communication buses. Wherein, the communication interface 703 is controlled by the processor 702 for transmitting and receiving information.

Memory 701 may include both read-only memory and random access memory and provides instructions and data to processor 702. A portion of memory 701 may also include non-volatile random access memory.

The communication interface 703 is used for receiving or transmitting data.

The Processor 702 may be a Central Processing Unit (CPU), and the Processor 702 may also be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general-purpose processor may be a microprocessor, but in the alternative, the processor 702 may be any conventional processor or the like. Wherein:

a memory 701 for storing program instructions.

A processor 702 for invoking program instructions stored in the memory 701.

The processor 702 invokes the program instructions stored in the memory 701 to cause the terminal device 700 to execute the method executed by the terminal device in the above-described method embodiment.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a module device according to an embodiment of the present disclosure. The module apparatus 800 can perform the steps related to the terminal apparatus in the foregoing method embodiments, and the module apparatus 800 includes: a communication module 801, a power module 802, a memory module 803, and a chip 804.

The power module 802 is used for providing power for the module device; the storage module 803 is used for storing data and instructions; the communication module 801 is used for performing internal communication of module equipment or performing communication between the module equipment and external equipment; the chip 804 is configured to perform the method performed by the terminal device in the method embodiment described above.

It should be noted that, for details that are not mentioned in the embodiments corresponding to the devices, chips, terminal devices, and module devices in the embodiment of the present application and specific implementation manners of the steps, reference may be made to the embodiments shown in fig. 1 to 5 and the foregoing description, and details are not described here again.

Embodiments of the present application further provide a computer-readable storage medium, in which instructions are stored, and when the computer-readable storage medium is executed on a processor, the method flow of the above method embodiments is implemented.

Embodiments of the present application further provide a computer program product, where when the computer program product runs on a processor, the method flow of the foregoing method embodiments is implemented.

With regard to each module/unit included in each apparatus and product described in the above embodiments, it may be a software module/unit, or may also be a hardware module/unit, or may also be a part of a software module/unit and a part of a hardware module/unit. For example, each module/unit included in each apparatus or product applied to or integrated in a chip may all be implemented by hardware such as a circuit, or at least a part of the modules/units may be implemented by a software program, where the software program runs on an integrated processor inside the chip, and the rest (if any) part of the modules/units may be implemented by hardware such as a circuit; for each device or product applied to or integrated with the chip module, each module/unit included in the device or product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same piece (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules/units may be implemented by using a software program running on a processor integrated inside the chip module, and the rest (if any) of the modules/units may be implemented by using hardware such as a circuit; for each device or product applied to or integrated in the terminal, the modules/units included in the device or product may all be implemented by hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least some of the modules/units may be implemented by software programs running on a processor integrated in the terminal, and the rest (if any) of the modules/units may be implemented by hardware such as a circuit.

It is noted that, for simplicity of explanation, the foregoing method embodiments are described as a series of acts or combination of acts, but those skilled in the art will appreciate that the present application is not limited by the order of acts, as some acts may, in accordance with the present application, occur in other orders and/or concurrently. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

The descriptions of the embodiments provided in the present application may refer to each other, and the descriptions of the embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments. For convenience and brevity of description, for example, the functions and operations performed by the devices and apparatuses provided in the embodiments of the present application may refer to the related descriptions of the method embodiments of the present application, and may also be referred to, combined with or cited among the method embodiments and the device embodiments.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of dc cancellation, the method comprising:

determining a first Resource Element (RE) located at the center frequency point of a first Resource Block (RB);

determining a target signal strength based on signal strengths of a plurality of second REs, the port corresponding to the first RE being located in a same CDM group as the port corresponding to the second RE, and the first RE being located in a same symbol in the first RB as the second RE;

and updating the signal strength of the first RE to the target signal strength so as to remove the direct current on the first RE.

2. The method of claim 1, wherein determining the target signal strength based on the signal strengths of the plurality of second REs comprises:

determining a weighted sum of the signal strengths of the plurality of second REs as a target signal strength.

3. The method of claim 2, wherein the target signal strength CE (REdc) satisfies the following equation:

wherein N is the number of the second REs, coeff _i Weights, CE (RE), corresponding to the ith said second RE _i ) The signal strength corresponding to the ith second RE.

4. The method of claim 3, wherein the weight corresponding to the Xth second RE is greater than the weight corresponding to the Yth second RE, and a frequency-domain distance between the Xth second RE and the first RE is greater than a frequency-domain distance between the Yth second RE and the first RE.

5. The method according to any of claims 1-4, wherein before determining the first RE located at the position of the center frequency point of the first Resource Block (RB), the method further comprises:

determining the offset between the initial frequency domain position of the first resource block and the 0 frequency point, wherein the initial frequency domain position of the first resource block is the frequency domain position closest to the 0 frequency point in the first resource block;

and determining the position of the central frequency point of the first resource block based on the offset and half of the width of the first resource block.

6. The method according to claim 5, wherein the center bin position dc _ re _ index satisfies the following equation: dc _ re _ index = PRB _ offset + activeBWP _ size × 6, where PRB _ offset is an offset between the starting point of the first resource block and the 0 bin, and activeBWP _ size is a width of one subcarrier.

7. The method of any of claims 1-6, wherein a group of said CDM groups comprises two ports as specified by a protocol.

8. A dc removal apparatus, comprising:

a determining unit, configured to determine a first RE located at a center frequency point of a first resource block RB;

the determining unit is further configured to determine a target signal strength based on signal strengths of a plurality of second REs, where a port corresponding to the first RE and a port corresponding to the second RE are located in the same CDM group, and the first RE and the second RE are located in the same symbol in the first RB;

an updating unit, configured to update the signal strength of the first RE to the target signal strength to remove the direct current on the first RE.

9. A chip comprising a processor and a communication interface, the processor being configured to cause the chip to perform the method of any one of claims 1 to 7.

10. The utility model provides a module equipment, its characterized in that, module equipment includes communication module, power module, storage module and chip, wherein: the power supply module is used for providing electric energy for the module equipment;

the storage module is used for storing data and instructions;

the communication module is used for carrying out internal communication of module equipment or is used for carrying out communication between the module equipment and external equipment;

the chip is used for executing the method of any one of claims 1 to 7.

11. A terminal device, comprising a memory for storing a computer program comprising program instructions and a processor configured to invoke the program instructions to perform the method of any one of claims 1 to 7.

12. A computer readable storage medium having computer readable instructions stored therein which, when run on a communication device, cause the communication device to perform the method of any one of claims 1-7.