CN114244665A

CN114244665A - Frequency offset compensation method and device and electronic equipment

Info

Publication number: CN114244665A
Application number: CN202111552774.1A
Authority: CN
Inventors: 戴延中; 李骁
Original assignee: Beijing Eswin Computing Technology Co Ltd; Guangzhou Quanshengwei Information Technology Co Ltd
Current assignee: Beijing Eswin Computing Technology Co Ltd; Guangzhou Quanshengwei Information Technology Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-03-25
Anticipated expiration: 2041-12-17
Also published as: CN114244665B

Abstract

The embodiment of the application relates to the technical field of communication, and discloses a frequency offset compensation method, a device and electronic equipment, wherein the method comprises the following steps: acquiring a Carrier Frequency Offset (CFO) estimated value of user equipment and connection information of the user equipment and network equipment; the connection information indicates a connection stage of the user equipment and the network equipment; determining a CFO compensation factor according to the connection information; and determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensating the CFO. The embodiment of the application provides a frequency offset compensation method, different CFO compensation factors are set for user equipment and network equipment, different connection stages are achieved, different frequency offset compensation values are adopted to compensate CFO, and accuracy of CFO compensation is improved.

Description

Frequency offset compensation method and device and electronic equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a frequency offset compensation method, an apparatus, and an electronic device.

Background

In the field of communications, due to system differences between a transmitter and a receiver or due to the influence of transmission environments, etc., a Carrier Frequency Offset (CFO) may be generated by a Carrier frequency offset of a transmission signal received by the receiver, that is, a frequency offset between a local oscillator of the receiver and a Carrier signal in a signal transmitted by the transmitter. For example, due to a frequency mismatch with the local oscillator of the receiver and the transmitter, or due to doppler effects caused by the mobility of the transmitter or receiver. CFO has some impact on the performance of the receiver, especially for Orthogonal Frequency Division Multiplexing (OFDM) systems. Therefore, in order to overcome the influence of the carrier frequency offset, frequency offset compensation, that is, frequency offset compensation, is required.

Disclosure of Invention

The embodiment of the application provides a frequency offset compensation method, which is used for providing a frequency offset compensation mode.

Correspondingly, the embodiment of the application also provides a frequency offset compensation device, an electronic device and a storage medium, which are used for ensuring the implementation and application of the method.

In order to solve the above problem, an embodiment of the present application discloses a frequency offset compensation method, including:

acquiring a Carrier Frequency Offset (CFO) estimated value of user equipment and connection information of the user equipment and network equipment; the connection information indicates a connection stage of the user equipment and the network equipment;

determining a CFO compensation factor according to the connection information;

and determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensating the CFO.

Optionally, the determining a CFO compensation factor according to the connection information includes:

determining a signal strength parameter of the user equipment if the connection information indicates that the connection phase is a first phase; determining the CFO compensation factor according to the signal intensity parameter;

determining that the CFO compensation factor comprises a first compensation factor if the connection information indicates that the connection phase is a second phase.

Optionally, the determining the CFO compensation factor according to the signal strength parameter includes:

determining that the CFO compensation factor comprises a second compensation factor if the signal strength parameter is less than a first strength threshold;

determining that the CFO compensation factor comprises a third compensation factor if the signal strength parameter is greater than or equal to the first strength threshold.

Optionally, in a case that the signal strength parameter is smaller than a first strength threshold, the frequency offset compensation value is smaller than or equal to a first compensation threshold;

the frequency offset compensation value is less than or equal to a second compensation threshold value if the signal strength parameter is greater than or equal to the first strength threshold value; the second compensation threshold is greater than the first compensation threshold.

Optionally, the first compensation factor is greater than the third compensation factor, and the second compensation factor is less than the third compensation factor.

Optionally, in a case that the connection information indicates that the connection stage is the second stage, the frequency offset compensation value is less than or equal to a third compensation threshold.

Optionally, the signal strength parameter comprises a received signal strength indication RSSI or a signal to interference plus noise ratio SINR.

The embodiment of the application also discloses a frequency offset compensation device, which comprises:

an obtaining module, configured to obtain a carrier frequency offset CFO estimation value of a user equipment and connection information between the user equipment and a network device; the connection information indicates a connection stage of the user equipment and the network equipment;

the determining module is used for determining a CFO compensation factor according to the connection information;

and the compensation module is used for determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor and compensating the CFO.

Optionally, the determining module includes:

a first determining submodule, configured to determine a signal strength parameter of the user equipment when the connection information indicates that the connection stage is a first stage; determining the CFO compensation factor according to the signal intensity parameter;

a second determining sub-module, configured to determine that the CFO compensation factor includes a first compensation factor if the connection information indicates that the connection stage is a second stage.

Optionally, the first determining sub-module is configured to:

The embodiment of the present application further discloses an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the frequency offset compensation method shown in the first aspect of the present application is implemented.

The embodiment of the application also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is used for realizing the method according to one or more of the embodiments of the application when being executed by a processor.

The technical scheme provided by the embodiment of the application has the following beneficial effects:

in the embodiment of the application, a Carrier Frequency Offset (CFO) estimated value of user equipment and connection information of the user equipment and network equipment are obtained; determining a CFO compensation factor according to the connection information; determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensating the CFO; the embodiment of the application provides a frequency offset compensation method, different CFO compensation factors are set for user equipment and network equipment, different connection stages are achieved, different frequency offset compensation values are adopted to compensate CFO, and accuracy of CFO compensation is improved.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flowchart of a frequency offset compensation method according to an embodiment of the present application;

FIG. 2 is one of schematic diagrams of a second example provided by an embodiment of the present application;

fig. 3 is a second schematic diagram of a second example provided by the present application;

fig. 4 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the embodiments set forth below in connection with the drawings are exemplary descriptions for explaining technical solutions of the embodiments of the present application, and do not limit the technical solutions of the embodiments of the present application.

As used herein, 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 be further understood that the terms "comprises" and/or "comprising," when used in connection with embodiments of the present application, specify the presence of stated features, information, data, steps, operations, elements, and/or components (the agent may adapt to a particular situation), but do not preclude the presence or addition of other features, information, data, steps, operations, elements, components, and/or groups thereof, as would be recognized by one skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein indicates at least one of the items defined by the term, e.g., "a and/or B" may be implemented as "a", or as "B", or as "a and B".

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present application provides a frequency offset compensation method, which is optionally applied to a User Equipment (UE), where the UE may be a device providing voice and/or data connectivity to a User, a handheld device with a network connection function, or other processing device connected to a modem.

As shown in fig. 1, the method may include the steps of:

step 101, acquiring a Carrier Frequency Offset (CFO) estimated value of user equipment and connection information of the user equipment and network equipment; the connection information indicates a connection phase of the user equipment and the network equipment.

The embodiment of the application can be applied to a cellular mobile network scene or a wireless local area network scene; cellular mobile network scenarios such as 3G, 4G or 5G NR scenarios, wireless local area networks such as Wi-Fi systems. Accordingly, the network device may be a base station or an Access Point device (Access Point).

Optionally, the CFO estimation value may be calculated or measured by the ue, and the calculation method may be a training sequence-based CFO estimation algorithm, a blind CFO estimation algorithm, a semi-blind CFO estimation algorithm, or the like; specifically, CFO estimation algorithms based on training sequences such as Moose's CFO estimators, ML based CFO estimators, and the like; blind CFO estimation algorithms such as CP based CFO estimators, Blind closed-form CFO estimators; semi-blind CFO estimation algorithms such as Semi-blind joint CFO and channel estimation.

The connection information indicates connection phase information of the user equipment with the network equipment, for example, an initial connection phase with the network equipment (such as each communication phase, a first connection with the network equipment, a second connection), or a connection phase after the initial connection.

And step 102, determining a CFO compensation factor according to the connection information.

The connection stages and the CFO compensation factor corresponding to each connection stage can be preset. Specifically, in the initial connection stage of each ue and network device, in order to overcome the influence caused by the frequency offset, the CFO needs to be compensated quickly, so that the CFO compensation factor can be set to a larger value; and the CFO compensation factor may be set to a smaller value at other connection stages after the initial connection to smoothly compensate for the CFO.

And 103, determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensating the CFO.

Wherein, the frequency offset compensation value can be the product between the CFO estimated value and the CFO compensation factor; therefore, different connection stages correspond to different compensation factors, so that different connection stages are realized, different frequency offset compensation values are adopted to compensate CFO, the accuracy of CFO compensation is improved, and the condition that user equipment fails to receive signals is avoided.

As a first example, when the user equipment 1 connects to the network equipment 1 for the first time, the user equipment determines that its CFO estimation value is f _ CFO and determines that its CFO compensation factor is α _ h according to the connection information, then at the initial connection stage, the frequency offset compensation value of the user equipment 1 is f _ CFO × α _ h, for example, α _ h is 0.9.

In other connection phases after the initial connection phase, the user equipment 1 determines that its CFO compensation factor is α _ l, and the frequency offset compensation value of the user equipment 1 is f _ CFO × α _ l, for example, α _ l is 0.5.

It can be seen that the frequency offset compensation values differ by 0.4f _ CFO at different connection stages.

Specifically, in the initial connection stage, the influence caused by the frequency offset needs to be overcome quickly, and therefore, the CFO compensation factor may be set to 0.9f _ CFO; and at other connection stages after the initial connection, the CFO compensation factor may be set to 0.5f _ CFO to smoothly compensate for the CFO.

In an optional implementation, the determining a CFO compensation factor according to the connection information includes:

the first condition is as follows: determining a signal strength parameter of the user equipment if the connection information indicates that the connection phase is a first phase;

and determining the CFO compensation factor according to the signal strength parameter.

A first stage, for example, an initial connection stage of the user equipment and the network equipment, where the initial connection stage is, for example, the previous N connections of the user equipment and the network equipment (or the previous N connections when the user equipment is connected again after disconnection, where N is a positive integer), at this time, a signal strength parameter of the user equipment needs to be obtained, and a CFO compensation factor is determined according to the signal strength parameter; optionally, the Signal Strength parameter is, for example, a Received Signal Strength Indicator (RSSI) or a Signal to Interference plus Noise Ratio (SINR).

In case two, in case the connection information indicates that the connection phase is the second phase, determining that the CFO compensation factor includes the first compensation factor.

In the second stage, i.e. the stage after the initial connection stage, the CFO compensation factor may be a predetermined value, i.e. a first compensation factor, and the value of the first compensation factor may be predetermined, e.g. 1.

Optionally, in the second case, when the connection information indicates that the connection stage is the second stage, the frequency offset compensation value is less than or equal to a third compensation threshold, and the third compensation threshold is, for example, 2. It can be understood that, in the embodiment of the present application, the compensation threshold is an upper limit value of a single compensation.

Further, in the first case of the embodiment of the present application, the determining the CFO compensation factor according to the signal strength parameter includes:

Optionally, the second compensation factor is smaller than the third compensation factor, which is smaller than the first compensation factor, for example, the first compensation factor is 1, the second compensation factor is 0.5, and the third compensation factor is 0.9.

Taking the RSSI as an example, the first strength threshold corresponding to the RSSI is-80, and if the RSSI is less than-80, which indicates that the current signal strength is weak, the compensation factor is set to a smaller value, so as to compensate the CFO with a smaller amplitude, thereby avoiding causing larger signal jitter. If the RSSI is greater than or equal to-80, which indicates that the current signal strength is strong, the CFO can be compensated with a large amplitude, and the compensation factor is set to a large value, which requires rapid compensation of the CFO.

In an alternative embodiment, in the case that the signal strength parameter is less than a first strength threshold, the frequency offset compensation value is less than or equal to a first compensation threshold;

That is, in the case of weak signal strength, the highest threshold of the frequency offset compensation value is the first compensation threshold, for example, 10; in the case of strong signal strength, the highest threshold of the frequency offset compensation value is the first compensation threshold, for example, 25.

As a second example, referring to fig. 2, fig. 2 shows one of the schematic diagrams of a user equipment, comprising: a radio frequency front end module (RF front) 201, a Local frequency control module (Local oscillator frequency control)202, an analog-to-digital conversion module (ADC)203, a CFO estimation module (CFO estimation)204, a fast fourier transform module (FFT)205, and a Demodulation Decoder (Demodulation Decoder) 206.

After receiving a signal sent by a network device, the radio frequency front-end module 201 sends the signal to the CFO estimation module 204 after being processed by the analog-to-digital conversion module 203; the CFO estimation module 204 sends the CFO estimation value to the local frequency control module 202, the local frequency control module 202 determines a CFO compensation factor and a frequency offset compensation value according to the connection information, compensates for the CFO according to the frequency offset compensation value, sends the compensated CFO to the fast fourier transform module 205 through the analog-to-digital conversion module 203 and the CFO estimation module 204, and finally sends the CFO to the demodulation and decoding module 206, so as to obtain a received signal.

Referring to fig. 3, fig. 3 shows a second schematic diagram of a user equipment, which includes: a radio frequency processing module (RF processing)301, a Local oscillator frequency control (lo) 302, a rectification feedback unit/digital front end module (AFE/DEF)303, a CFO estimation module (CFO estimation)304, and a Modem module (mode) 305.

After receiving a signal sent by the network device, the rf processing module 301 sends the signal to the CFO estimation module 304 after being processed by the rectification feedback unit/digital front-end module 303; the CFO estimation module 304 sends the CFO estimation value to the local frequency control module 302, the local frequency control module 302 determines a CFO compensation factor and a frequency offset compensation value according to the connection information, compensates the CFO according to the frequency offset compensation value, and sends the compensated CFO to the modem module 305 through the rectification feedback unit/digital front end module (AFE/DEF)303 and the CFO estimation module 304 to obtain a received signal.

Based on the same principle as the method provided in the embodiment of the present application, an embodiment of the present application further provides a frequency offset compensation apparatus, as shown in fig. 4, the apparatus includes:

an obtaining module 401, configured to obtain a carrier frequency offset CFO estimation value of a user equipment and connection information between the user equipment and a network device; the connection information indicates a connection phase of the user equipment and the network equipment.

A determining module 402, configured to determine a CFO compensation factor according to the connection information.

In other connection phases after the initial connection phase, the user equipment 1 determines that its CFO compensation factor is α _ l, and the frequency offset compensation value of the user equipment 1 is f _ CFO × α _ l, for example, α _ h is 0.5.

A compensation module 403, configured to determine a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensate for CFO.

Optionally, in this embodiment of the present application, the determining module 402 includes:

Optionally, in an embodiment of the present application, the first determining sub-module is configured to:

Optionally, in this embodiment of the present application, when the signal strength parameter is smaller than a first strength threshold, the frequency offset compensation value is smaller than or equal to the first compensation threshold;

Optionally, in this embodiment of the application, the first compensation factor is greater than the third compensation factor, and the second compensation factor is smaller than the third compensation factor.

Optionally, in this embodiment of the application, when the connection information indicates that the connection stage is the second stage, the frequency offset compensation value is less than or equal to a third compensation threshold.

Optionally, in this embodiment of the application, the signal strength parameter includes a received signal strength indication RSSI or a signal-to-interference-plus-noise ratio SINR.

The frequency offset compensation apparatus provided in the embodiment of the present application can implement each process implemented in the apparatus embodiments of fig. 1 to fig. 3, and is not described herein again to avoid repetition.

In the frequency offset compensation apparatus provided by the present application, an obtaining module 401 obtains a carrier frequency offset CFO estimation value of a user equipment and connection information between the user equipment and a network device; the determining module 402 determines a CFO compensation factor according to the connection information; the compensation module 403 determines a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensates for CFO; the embodiment of the application provides a frequency offset compensation method, different CFO compensation factors are set for user equipment and network equipment, different connection stages are achieved, different frequency offset compensation values are adopted to compensate CFO, and accuracy of CFO compensation is improved.

The frequency offset compensation apparatus of the embodiment of the present application may execute the frequency offset compensation method provided in the embodiment of the present application, and the implementation principles thereof are similar, actions executed by each module and unit in the frequency offset compensation apparatus in the embodiments of the present application correspond to steps in the frequency offset compensation method in the embodiments of the present application, and for detailed functional description of each module of the frequency offset compensation apparatus, reference may be specifically made to the description in the corresponding frequency offset compensation method shown in the foregoing, and details are not repeated here.

Based on the same principle as the method shown in the embodiments of the present application, the embodiments of the present application also provide an electronic device, which may include but is not limited to: a processor and a memory; a memory for storing a computer program; and a processor, configured to execute the frequency offset compensation method according to any of the alternative embodiments of the present application by invoking a computer program. Compared with the prior art, the frequency offset compensation method provided by the application obtains the CFO estimated value of the carrier frequency offset of the user equipment and the connection information of the user equipment and the network equipment; determining a CFO compensation factor according to the connection information; determining a frequency offset compensation value according to the CFO estimation value and the CFO compensation factor, and compensating the CFO; the embodiment of the application provides a frequency offset compensation method, different CFO compensation factors are set for user equipment and network equipment, different connection stages are achieved, different frequency offset compensation values are adopted to compensate CFO, and accuracy of CFO compensation is improved.

In an alternative embodiment, there is also provided an electronic device, as shown in fig. 5, the electronic device 5000 shown in fig. 5 includes: a processor 5001 and a memory 5003. The processor 5001 and the memory 5003 are coupled, such as via a bus 5002. Optionally, the electronic device 5000 may further include a transceiver 5004, and the transceiver 5004 may be used for data interaction between the electronic device and other electronic devices, such as transmission of data and/or reception of data. It should be noted that the transceiver 5004 is not limited to one in practical application, and the structure of the electronic device 5000 is not limited to the embodiment of the present application.

The Processor 5001 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 5001 may also be a combination of processors implementing computing functionality, e.g., a combination comprising one or more microprocessors, a combination of DSPs and microprocessors, or the like.

Bus 5002 can include a path that conveys information between the aforementioned components. The bus 5002 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 5002 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

The Memory 5003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium, other magnetic storage devices, or any other medium that can be used to carry or store a computer program and that can be Read by a computer, without limitation.

The memory 5003 is used for storing computer programs for executing the embodiments of the present application, and is controlled by the processor 5001 for execution. The processor 5001 is configured to execute computer programs stored in the memory 5003 to implement the steps shown in the foregoing method embodiments.

Among them, electronic devices include but are not limited to: mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, and when being executed by a processor, the computer program may implement the steps and corresponding contents of the foregoing method embodiments.

Embodiments of the present application further provide a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps and corresponding contents of the foregoing method embodiments can be implemented.

The terms "first," "second," "third," "fourth," "1," "2," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than illustrated or otherwise described herein.

It should be understood that, although each operation step is indicated by an arrow in the flowchart of the embodiment of the present application, the implementation order of the steps is not limited to the order indicated by the arrow. In some implementation scenarios of the embodiments of the present application, the implementation steps in the flowcharts may be performed in other sequences as desired, unless explicitly stated otherwise herein. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on an actual implementation scenario. Some or all of these sub-steps or stages may be performed at the same time, or each of these sub-steps or stages may be performed at different times, respectively. In a scenario where execution times are different, an execution sequence of the sub-steps or the phases may be flexibly configured according to requirements, which is not limited in the embodiment of the present application.

The foregoing is only an optional implementation manner of a part of implementation scenarios in this application, and it should be noted that, for those skilled in the art, other similar implementation means based on the technical idea of this application are also within the protection scope of the embodiments of this application without departing from the technical idea of this application.

Claims

1. A method of frequency offset compensation, comprising:

determining a CFO compensation factor according to the connection information;

2. The frequency offset compensation method of claim 1, wherein said determining a CFO compensation factor based on said connection information comprises:

3. The frequency offset compensation method of claim 2, wherein said determining the CFO compensation factor based on the signal strength parameter comprises:

4. The frequency offset compensation method of claim 3, wherein in the case that the signal strength parameter is less than a first strength threshold, the frequency offset compensation value is less than or equal to a first compensation threshold;

5. The method of frequency deviation compensation of claim 4 wherein the first compensation factor is greater than the third compensation factor and the second compensation factor is less than the third compensation factor.

6. The frequency offset compensation method of claim 2, wherein in case that the connection information indicates that the connection phase is the second phase, the frequency offset compensation value is less than or equal to a third compensation threshold.

7. The frequency offset compensation method of claim 2, wherein the signal strength parameter comprises a Received Signal Strength Indication (RSSI) or a signal to interference plus noise ratio (SINR).

8. A frequency offset compensation apparatus, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method of any one of claims 1 to 7.