CN112995074B

CN112995074B - TRS-based AFC estimation method, device, terminal and storage medium

Info

Publication number: CN112995074B
Application number: CN202110557090.4A
Authority: CN
Inventors: 张洋
Original assignee: Spreadtrum Communications Tianjin Co Ltd
Current assignee: Spreadtrum Communications Tianjin Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-08-03
Anticipated expiration: 2041-05-21
Also published as: CN112995074A

Abstract

The application provides an AFC estimation method, an AFC estimation device, a terminal and a storage medium based on TRS, wherein the method comprises the following steps: judging whether a TRS symbol in a first time slot and/or a second time slot in a time-frequency tracking reference signal TRS burst is effective or not; and when only part of TRS symbols in the first slot and/or the second slot in the TRS burst are effective, calculating to obtain a final frequency error FOE according to the effective TRS symbols in the first slot and the second slot. In the embodiment of the application, part of effective TRS symbols can be utilized to carry out FOE estimation, effective TRS resources are fully utilized, system frequency offset is timely and accurately compensated, and demodulation performance is improved.

Description

TRS-based AFC estimation method, device, terminal and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to an AFC estimation method and apparatus based on a TRS, a terminal, and a storage medium.

Background

Frequency synchronization in a communication system is a key technology affecting system performance, and a large frequency deviation may cause interference between signals and directly affect accuracy of channel transmission, so that high-reliability frequency offset estimation is particularly important for the communication system.

In the NR system, a terminal needs to estimate a frequency deviation according to a time-frequency Tracking Reference Signal (TRS) transmitted from a network in a connection state. The TRS is transmitted according to bursts (bursts), each TRS burst comprises 2 slots (slots), each slot has 2 TRS symbols (symbols), and when the TRS is used for estimating a frequency error (FOE), all TRS symbols (2 TRS symbols in each slot) in the 2 slots are required to be calculated to obtain an FOE value.

However, in an actual application scenario, due to the gap (difference) measured by the pilot frequency or the inter-system, the gap in a dual-card scenario, Discontinuous Reception (DRX), and other factors, a part of TRS symbols in 2 slots may be invalid, and thus the FOE evaluation may not be performed.

Disclosure of Invention

The application provides an AFC estimation method, device, terminal and storage medium based on TRS, which are beneficial to solving the problem that in the prior art, part of TRS symbols in one TRS burst are invalid, so that FOE evaluation cannot be carried out.

In a first aspect, an embodiment of the present application provides an AFC estimation method based on a TRS, including:

judging whether a TRS symbol in a first time slot and/or a second time slot in a time-frequency tracking reference signal TRS burst is effective or not;

and when only part of TRS symbols in the first slot and/or the second slot in the TRS burst are effective, calculating to obtain a final frequency error FOE according to the effective TRS symbols in the first slot and the second slot.

Preferably, when only part of TRS symbols in a first slot and/or a second slot of the TRS burst is valid, calculating to obtain a final FOE according to the valid TRS symbols in the first slot and the second slot, including:

if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is invalid, and a third TRS symbol in the second slot is valid, a fourth TRS symbol in the second slot is valid, then:

calculating to obtain a first FOE according to the first TRS symbol and the third TRS symbol;

calculating to obtain a second FOE according to the first TRS symbol and the fourth TRS symbol;

and combining the first FOE and the second FOE according to the maximum ratio to obtain the final FOE.

if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is valid, and a third TRS symbol in the second slot is valid, and a fourth TRS symbol in the second slot is invalid, then:

calculating to obtain a second FOE according to the second TRS symbol and the third TRS symbol;

if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is invalid, and a third TRS symbol in the second slot is valid, a fourth TRS symbol in the second slot is invalid, then:

and calculating to obtain the final FOE according to the first TRS symbol and the third TRS symbol.

In a second aspect, an embodiment of the present application provides a TRS-based AFC estimation apparatus, including:

the judging module is used for judging whether a TRS symbol in a first time slot and/or a second time slot in a time-frequency tracking reference signal TRS burst is effective or not;

and the FOE calculation module is used for calculating and obtaining a final frequency error FOE according to the effective TRS symbol in the first slot and the second slot when only part of TRS symbol is effective in the first slot and/or the second slot in the TRS burst.

Preferably, the FOE calculation module is specifically configured to:

In a third aspect, an embodiment of the present application provides a terminal, including:

one or more processors;

a memory;

and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions which, when executed by the terminal, cause the terminal to perform the method of any of the above first aspects.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program, where the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method according to any one of the above first aspects.

In the embodiment of the application, part of effective TRS symbols can be utilized to carry out FOE estimation, effective TRS resources are fully utilized, system frequency offset is timely and accurately compensated, and demodulation performance is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic system architecture diagram of a terminal according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a TRS symbol according to an embodiment of the present application;

fig. 3 is a schematic flowchart of an AFC estimation method based on TRS according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, 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 application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The terms referred to in the embodiments of the present application will be described first below.

TRS (tracking Reference signal), time frequency tracking Reference signal;

afc (automatic Frequency control), automatic Frequency control;

FOE, frequency error;

slot, time Slot;

symbol, signal;

burst, Burst;

SNR (Signal-to-Noise Ratio), Signal-to-Noise Ratio.

In order to better understand the embodiment of the present application, a system architecture of a terminal provided in the embodiment of the present application is first described below. Referring to fig. 1, a system architecture diagram of a terminal provided in the embodiment of the present application is shown. The terminal may also be referred to as a mobile terminal, a User Equipment (UE), and the like, and specifically may include: the present disclosure relates to a Mobile terminal, and more particularly, to a Mobile terminal, a handheld computer, a tablet computer, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable Device (such as a smart watch, a smart bracelet, etc.), and the like.

In the system architecture of the terminal shown in fig. 1, at least an antenna, a Radio Frequency Front End (RFFE), a Radio Frequency Integrated Circuit (RFIC), an oscillator, a phase-locked loop, and a processor may be included. The processor may be an SOC (System on Chip) Chip including an Application processor, a baseband processor, an image processor, etc., or a baseband processor used only for baseband signal processing or an Application Specific Integrated Circuit (ASIC), etc., and the RFFE and the RFIC constitute a Transceiver (Transceiver) of the user terminal, and are configured to modulate a transmission signal from the baseband part and transmit the modulated transmission signal to an antenna, or receive and demodulate an air interface signal and transmit the demodulated transmission signal to the baseband part for processing a communication protocol.

The RFFE may comprise at least: a duplexer and a Power Amplifier (PA). The duplexer is mainly used for coupling the transmitting path and the receiving path to the antenna, so that the antenna can transmit signals or receive signals or transmit and receive signals at the same time; the PA is used primarily for power amplification of the transmit signal on the transmit path so that it can be transmitted from the antenna.

The radio frequency chip RFIC is a modulation and demodulation unit behind the radio frequency front end RFFE, and may at least include an up converter and a down converter, where the up converter is mainly used for modulating signals, that is, modulating low-frequency signals of a baseband into high-frequency signals (that is, performing up conversion) on a transmission path; the downconverter is used primarily to demodulate signals, i.e., demodulate high frequency signals to baseband signals on the receive path (i.e., downconvert). The rf chip RFIC may further include a Low Noise Amplifier (LNA) located before demodulation of the down-converter (as shown by a dotted line in the figure), and is mainly used for amplifying a received signal.

The oscillator may be a crystal oscillator XO which may be used to generate an oscillation frequency which is mixed with an up-converter or down-converter by means of a phase locked loop. The up-converter and down-converter, which may also be referred to as mixers, generate a baseband signal by mixing a high frequency signal with an oscillation signal generated by an oscillator, or generate a high frequency signal by mixing a baseband signal with an oscillation signal generated by an oscillator.

The processor is mainly configured to process a baseband signal according to a Communication protocol, and may support Communication protocols such as GSM (Global System for Mobile Communication), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution), CDMA (Code Division Multiple Access), and 5G (The 5th Generation Mobile Communication Technology), and The embodiments of The present application are not limited thereto.

It can be understood that frequency synchronization in a communication system is a key technology affecting system performance, and a large frequency deviation may cause inter-signal interference, which directly affects accuracy of channel transmission, so that a highly reliable frequency offset estimation is particularly important for the communication system.

Referring to fig. 2, a schematic diagram of a TRS symbol provided in an embodiment of the present application is shown. As shown in fig. 2, two slots are included in one TRS burst, namely slot0 and slot 1. Wherein, the slot0 contains two TRS symbols with 3 symbol time interval, which are TRS symbol0 and TRS symbol1 respectively; similarly, two TRS symbols with a time interval of 3 symbols, TRS symbol0 and TRS symbol1, are included in slot 1.

If all the 4 TRS symbols are valid, the frequency error FOE is calculated as follows:

step S201: in slot0, conjugate multiplication is performed on channel estimation values H0(i) on 3 TRS subcarriers in TRS symbol0 and channel estimation values H1(i) on corresponding 3 TRS subcarriers in TRS symbol1 to obtain H0(i) × H1(i), and 3 results are accumulated to obtain D0.

Step S202: in slot1, conjugate multiplication is performed on channel estimation values H0(i) on 3 TRS subcarriers in TRS symbol0 and channel estimation values H1(i) on corresponding 3 TRS subcarriers in TRS symbol1 to obtain H0(i) × H1(i), and 3 results are accumulated to obtain D1.

Step S203: and calculating a phase deviation value alpha0= atan (imag (D0)/real (D0)) at the slot0 moment according to D0, and further obtaining an FOE value estimated by the slot0, wherein FOE0= alpha0/(deltaT × 2 × pi), wherein deltaT is a time interval between TRS symbol0 and TRS symbol 1.

Step S204: and calculating a phase deviation value alpha1= atan (imag (D1)/real (D1)) at the slot1 moment according to D1, and further obtaining an FOE value estimated by the slot1, wherein FOE1= alpha1/(deltaT × 2 × pi), wherein deltaT is a time interval between TRS symbol0 and TRS symbol 1.

Step S205: FOE0 and FOE1 were combined at maximum ratio to obtain the final FOE.

In one possible implementation, the maximum ratio combining policy is:

in slot0, calculating a signal-to-noise ratio SNR0 according to TRS symbol0 and TRS symbol;

in slot1, calculating a signal-to-noise ratio SNR1 according to TRS symbol0 and TRS symbol;

the final FOE = (SNR1 × FOE0+ SNR0 × FOE1)/(SNR0+ SNR1) was calculated.

From the calculation process of the FOE, in the prior art, only the TRS symbols in 1 TRS burst are all valid, one FOE is evaluated, and if only part of TRS symbols are valid, no FOE evaluation is performed. By adopting the method, TRS resources cannot be fully utilized, the accuracy of TRS FOE estimation is reduced, and in an extreme scene, when only one TRS symbol is effective in both slots, an effective FOE result cannot be obtained in the TRS burst period to adjust the system frequency offset, so that the downlink adjustment performance is reduced.

In view of the above problem, an AFC estimation scheme based on TRS is provided in the embodiments of the present application, which may perform FOE estimation by using a part of effective TRS symbols, and fully utilize effective TRS resources, so that the frequency offset of the system is compensated timely and accurately, and the demodulation performance is improved.

Referring to fig. 3, a schematic flow chart of an AFC estimation method based on TRS according to an embodiment of the present application is provided. As shown in fig. 3, it mainly includes the following steps.

Step S301: and judging whether all TRS symbols in the first slot and the second slot are valid.

As shown in fig. 2, two slots are included in one TRS burst, and each slot includes two TRS symbols.

For convenience of description, in the embodiment of the present application, the two slots are referred to as a first slot and a second slot, respectively, and the two TRS symbols in the first slot are referred to as a first TRS symbol and a second TRS symbol, respectively; the two TRS symbols in the second slot are referred to as a third TRS symbol and a fourth TRS symbol, respectively.

At this time, whether all TRS symbols in the first slot and the second slot are valid is judged, and if all TRS symbols in the first slot and the second slot are valid, the step S302 is executed; otherwise, the process proceeds to step S303.

Step S302: calculating to obtain a first FOE according to a first TRS symbol and a second TRS symbol in a first slot; and calculating to obtain a second FOE according to a third TRS symbol and a fourth TRS symbol in the second slot.

If all TRS symbols in the first slot and the second slot are valid, it is indicated that all TRS symbols can be used to calculate the final FOE. Specifically, a first FOE is obtained through calculation according to a first TRS symbol and a second TRS symbol in a first slot; and calculating to obtain a second FOE according to a third TRS symbol and a fourth TRS symbol in the second slot.

After the first FOE and the second FOE are obtained by calculation, the process proceeds to step S309, and the calculation of the final FOE is performed.

Step S303: and judging whether only one TRS symbol in the first slot is effective or not and whether all two TRS symbols in the second slot are effective or not.

In the embodiment of the present application, the first TRS symbol is valid, and the second RS symbol is invalid.

That is, a first TRS symbol in the first slot is valid, a second TRS symbol is invalid, and a third TRS symbol in the second slot is valid, a fourth TRS symbol in the second slot is valid.

If yes, go to step S304; otherwise, the process proceeds to step S305.

Step S304: calculating to obtain a first FOE according to a first TRS symbol in the first slot and a third TRS symbol in the second slot; and calculating to obtain a second FOE according to the first TRS symbol in the first slot and the fourth TRS symbol in the second slot.

Since the first TRS symbol in the first slot is valid, the first FOE and the second FOE can be obtained by calculating the first TRS symbol with the third TRS symbol and the fourth TRS symbol in the second slot respectively.

Step S305: and judging whether all the two TRS symbols in the first slot are valid or not, and only one TRS symbol in the second slot is valid.

In the embodiment of the present application, the description will be given by taking an example that the third TRS symbol is valid and the fourth RS symbol is invalid.

That is, a first TRS symbol in the first slot is valid, a second TRS symbol is valid, and a third TRS symbol in the second slot is valid, and a fourth TRS symbol in the second slot is invalid.

If yes, go to step S306; otherwise, the process proceeds to step S307.

Step S306: calculating to obtain a first FOE according to a first TRS symbol in the first slot and a third TRS symbol in the second slot; and calculating to obtain a second FOE according to a second TRS symbol in the first slot and a third TRS symbol in the second slot.

Since the third TRS symbol in the second slot is valid, the first FOE and the second FOE can be obtained by calculating the third TRS symbol with the first TRS symbol and the second TRS symbol in the first slot respectively.

Step S307: and judging whether only one TRS symbol in the first slot is effective or not and only one TRS symbol in the second slot is effective.

The effective TRS symbol in the first slot may be any one, and the effective TRS symbol in the second slot may be any one. In the embodiment of the present application, a first TRS symbol in a first slot and a third TRS symbol in a second slot are taken as examples to be effective.

If yes, go to step S308; otherwise, the process proceeds to step S310.

Step S308: and calculating to obtain the final FOE according to the first TRS symbol in the first slot and the third TRS symbol in the second slot.

At this time, since one TRS symbol is valid in each of the first slot and the second slot, the final FOE can be directly calculated according to the two TRS symbols without performing maximum ratio combining.

Step S309: and combining the first FOE and the second FOE according to the maximum ratio to obtain the final FOE.

In the above steps S302, S304 and S306, a first FOE and a second FOE are obtained respectively, and at this time, the first FOE and the second FOE may be subjected to maximum ratio combining to obtain a final FOE.

In the embodiment of the present application, the calculation strategy for maximum ratio combining may refer to the description in the embodiment shown in fig. 2, and for brevity, will not be described herein again.

Step S310: the TRS symbol based FOE evaluation was abandoned.

Specifically, if there is no valid TRS symbol in the first slot and the second slot, or there is only one valid TRS symbol, the FOE evaluation cannot be performed. Therefore, TRS symbol based FOE evaluation was abandoned.

It should be noted that, in the embodiment of the present application, the specific method for calculating FOE according to two TRS symbols may refer to the description in the embodiment shown in fig. 2, and for brevity, the description is not repeated herein.

In the embodiment of the application, part of effective TRS symbols are used for FOE estimation, effective TRS resources are fully utilized, system frequency offset is timely and accurately compensated, and demodulation performance is improved.

Corresponding to the foregoing method embodiment, an embodiment of the present application provides an AFC estimation apparatus based on a TRS, including: the judging module is used for judging whether a TRS symbol in a first time slot and/or a second time slot in a time-frequency tracking reference signal TRS burst is effective or not; and the FOE calculation module is used for calculating and obtaining a final frequency error FOE according to the effective TRS symbol in the first slot and the second slot when only part of TRS symbol is effective in the first slot and/or the second slot in the TRS burst.

Preferably, the FOE calculation module is specifically configured to: if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is invalid, and a third TRS symbol in the second slot is valid, a fourth TRS symbol in the second slot is valid, then: calculating to obtain a first FOE according to the first TRS symbol and the third TRS symbol; calculating to obtain a second FOE according to the first TRS symbol and the fourth TRS symbol; and combining the first FOE and the second FOE according to the maximum ratio to obtain the final FOE.

Preferably, the FOE calculation module is specifically configured to: if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is valid, and a third TRS symbol in the second slot is valid, and a fourth TRS symbol in the second slot is invalid, then: calculating to obtain a first FOE according to the first TRS symbol and the third TRS symbol; calculating to obtain a second FOE according to the second TRS symbol and the third TRS symbol; and combining the first FOE and the second FOE according to the maximum ratio to obtain the final FOE.

Preferably, the FOE calculation module is specifically configured to: if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is invalid, and a third TRS symbol in the second slot is valid, a fourth TRS symbol in the second slot is invalid, then: and calculating to obtain the final FOE according to the first TRS symbol and the third TRS symbol.

Corresponding to the method embodiment, the application also provides a terminal.

Referring to fig. 4, for a schematic structural diagram of a terminal provided in the embodiment of the present application, the terminal 400 may include: a processor 401, a memory 402, and a communication unit 403. The components communicate via one or more buses, and those skilled in the art will appreciate that the architecture of the servers shown in the figures is not limiting of the application, and may be a bus architecture, a star architecture, a combination of more or fewer components than those shown, or a different arrangement of components.

The communication unit 403 is configured to establish a communication channel so that the storage device can communicate with other devices. And receiving user data sent by other equipment or sending the user data to other equipment.

The processor 401, which is a control center of the storage device, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and/or processes data by operating or executing software programs and/or modules stored in the memory 402 and calling data stored in the memory. The processor may be composed of an Integrated Circuit (IC), for example, a single packaged IC, or a plurality of packaged ICs connected with the same or different functions. For example, the processor 401 may only include a Central Processing Unit (CPU). In the embodiments of the present application, the CPU may be a single arithmetic core or may include multiple arithmetic cores.

The memory 402 may be implemented by any type of volatile or non-volatile storage device or combination of volatile and non-volatile storage devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

The execution instructions in the memory 402, when executed by the processor 401, enable the terminal 400 to perform the steps in the above-described method embodiments.

In specific implementation, the present application further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments provided in the present application when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).

In a specific implementation, an embodiment of the present application further provides a computer program product, where the computer program product includes executable instructions, and when the executable instructions are executed on a computer, the computer is caused to perform some or all of the steps in the foregoing method embodiments.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

Those of ordinary skill in the art will appreciate that the various elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided by the present invention, any function, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only an embodiment of the present invention, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An AFC estimation method based on TRS, comprising:

when only partial TRS symbols in a first slot and/or a second slot in the TRS burst are effective, calculating to obtain a final frequency error FOE according to the effective TRS symbols in the first slot and the second slot;

when only part of TRS symbols in a first slot and/or a second slot in the TRS burst are valid, calculating and obtaining final FOE according to the valid TRS symbols in the first slot and the second slot, wherein the method comprises the following steps:

combining the first FOE and the second FOE according to the maximum ratio to obtain the final FOE;

and/or the presence of a gas in the gas,

2. The method according to claim 1, wherein when only partial TRS symbols in a first slot and/or a second slot of the TRS burst are valid, calculating to obtain a final FOE according to the valid TRS symbols in the first slot and the second slot, including:

3. An AFC estimation apparatus based on TRS, comprising:

an FOE calculation module, configured to, when only part of TRS symbols in a first slot and/or a second slot in the TRS burst are valid, calculate and obtain a final frequency error FOE according to the valid TRS symbols in the first slot and the second slot;

if a first TRS symbol in the first slot is valid, a second TRS symbol in the first slot is invalid, and a third TRS symbol in the second slot is valid, and a fourth TRS symbol in the second slot is valid, then:

and/or the presence of a gas in the gas,

4. The apparatus of claim 3, wherein the FOE calculation module is specifically configured to:

5. A terminal, comprising:

one or more processors;

a memory;

and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions which, when executed by the terminal, cause the terminal to perform the method of claim 1 or 2.

6. A computer-readable storage medium, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium resides to perform the method of claim 1 or 2.