CN109803369B - Joint time frequency estimation and compensation method, device and user equipment - Google Patents

Joint time frequency estimation and compensation method, device and user equipment Download PDF

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CN109803369B
CN109803369B CN201711145897.7A CN201711145897A CN109803369B CN 109803369 B CN109803369 B CN 109803369B CN 201711145897 A CN201711145897 A CN 201711145897A CN 109803369 B CN109803369 B CN 109803369B
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cto
cfo
trs
ssb
time slot
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CN109803369A (en
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贾亚男
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Spreadtrum Communications Shanghai Co Ltd
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Abstract

The invention provides a joint time frequency estimation and compensation method, which comprises the following steps: when the TRS and the SSB do not exist in the current time slot, compensating the time domain sampling point data of the current time slot based on the CTO and the CFO estimated on the most recent TRS or SSB time slot or the CTO and the CFO after loop filtering; when only TRS exists on the current time slot, compensating based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering; when only SSB exists on the current time slot, using the CTO and the CFO estimated by the most recent TRS or the CTO and the CFO after loop filtering to compensate, or using the CTO and the CFO estimated by the SSB to compensate; when the TRS and the SSB exist at the same time on the current time slot, deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB or compensating by using the CTO and CFO after loop filtering.

Description

Joint time frequency estimation and compensation method, device and user equipment
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a joint time-frequency estimation and compensation method, apparatus, and user equipment.
Background
In an LTE (Long Term Evolution) system, a base station can periodically transmit a Cell-specific Reference Signal (CRS), also called a Common Reference Signal (CRS), and a User Equipment (UE) keeps synchronization with the base station in time and frequency by tracking the Reference Signal. In other words, due to hardware differences between the UE and the base station, such as asynchronization of crystal oscillators, there is always a certain time-frequency offset, and the UE calculates and corrects the time-frequency offset by tracking CRS signals periodically transmitted by the base station. This time-Frequency Offset may also be referred to as Carrier Timing Offset (CTO) and Carrier Frequency Offset (CFO), respectively.
In a 5G NR (New Radio, New air interface) system, CRS signals do not exist, but in order to meet the requirements of different application scenarios and deployment scenarios, different time-frequency Tracking Reference Signals (TRSs) are required to be dynamically or semi-statically configured, so as to meet the requirement of obtaining optimal receiver performance by providing high-precision time-frequency synchronization for UEs under the condition of minimizing resource overhead.
In the LTE system, CTO and CFO estimation values are generally obtained based on CRS, and data of the next subframe is compensated after loop filtering. There are many differences in the design of TRSs and CRSs in 5G NR systems, the time-frequency density and periodicity of TRSs, TRSs being UE specific, and there are usage limitations (past estimates may not be used for the current slot). Therefore, how to realize joint time-frequency estimation and compensation in the 5G NR system is a problem to be solved.
Disclosure of Invention
The joint time-frequency estimation and compensation method, the joint time-frequency estimation and compensation device and the user equipment can realize joint time-frequency estimation and compensation based on the TRS and the SSB, thereby improving the receiving performance of a receiver.
In a first aspect, the present invention provides a joint time frequency estimation and compensation method, including:
judging whether a TRS and an SSB exist on the current time slot or not;
if the current time slot does not have the TRS and the SSB, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on carrier timing deviation (CTO) and carrier frequency deviation (CFO) estimated on the most recent TRS or SSB time slot or CTO and CFO after loop filtering;
if only TRS exists on the current time slot, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering;
if only SSB exists on the current time slot, when the CTO and CFO estimated by the SSB are less than or equal to the CTO and CFO estimated by the last TRS time slot before or the CTO and CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and CFO estimated by the last TRS before or the CTO and CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and CFO estimated by the SSB;
if the TRS and the SSB exist on the current time slot at the same time, deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB or performing CTO and CFO compensation on time domain sampling point data of the current time slot by using the CTO and CFO after loop filtering.
Optionally, the deriving, according to the CTO and the CFO estimated by the TRS and the SSB, a corresponding CTO and a corresponding CFO to perform CTO and CFO compensation on the time-domain sample point data of the current time slot includes:
and for the CTO and the CFO, when the estimated value of the SSB is less than or equal to the estimated value of the TRS, performing time-frequency compensation on the data of the current time slot by adopting the estimated value of the TRS.
Optionally, the deriving, according to the CTO and the CFO estimated by the TRS and the SSB, a corresponding CTO and a corresponding CFO to perform CTO and CFO compensation on the time-domain sample point data of the current time slot includes:
and for the CTO and the CFO, when the estimated value of the SSB is larger than the estimated value of the TRS, compensating the TRS symbol data on the current time slot by adopting the estimated value of the SSB, estimating the CTO and the CFO based on the compensated TRS symbol, calculating the arithmetic sum of the estimated value of the SSB and the estimated value of the compensated TRS, and performing time-frequency compensation on the data of the current time slot by taking the calculation result as the final CTO and CFO.
Optionally, the deriving, according to the CTO and the CFO estimated by the TRS and the SSB, a corresponding CTO and a corresponding CFO to perform CTO and CFO compensation on the time-domain sample point data of the current time slot includes:
and for the CTO and the CFO, when the SSB estimated value is larger than the TRS estimated value, calculating a final TRS estimated value based on the SSB estimated value and the TRS estimated value, and performing time-frequency compensation on the data of the current time slot according to the final TRS estimated value.
Optionally, the calculating a final TRS estimate based on the SSB estimate and the TRS estimate includes:
determining an estimate Δ for SSBSSBThe expression of (a) is:
Figure BDA0001472450140000031
where ρ isSSBIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000032
is the phase angle, in the range (— infinity, + ∞);
determining an estimated value Δ of TRSTRSThe expression of (a) is:
Figure BDA0001472450140000033
where ρ isTRSIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000034
is a phase angle in the range of [ - π, + π]；
By the formula
Figure BDA0001472450140000035
Determining a phase angle corresponding to an estimated value of SSB
Figure BDA0001472450140000036
The expression of (a) is:
Figure BDA0001472450140000041
wherein σ is
Figure BDA0001472450140000042
Number of 2 π contained therein, θSSBIs the remainder;
determining a phase angle corresponding to the final TRS estimated value
Figure BDA0001472450140000043
The expression of (a) is:
Figure BDA0001472450140000044
the final TRS estimate is calculated according to the following formula:
Figure BDA0001472450140000045
in a second aspect, the present invention provides a joint time frequency estimation and compensation apparatus, comprising:
the judging unit is used for judging whether the TRS and the SSB exist on the current time slot at the same time;
a first compensation unit, configured to perform, when a TRS and an SSB do not exist in a current timeslot, CTO and CFO compensation on time-domain sample point data of the current timeslot based on a CTO and a CFO estimated on a most recent TRS or SSB timeslot before or a CTO and a CFO after loop filtering;
a second compensation unit, configured to perform CTO and CFO compensation on time-domain sample point data of a current time slot based on a CTO and a CFO estimated by a TRS or a CTO and a CFO after loop filtering when only the TRS exists in the current time slot;
a third compensation unit, configured to, when only an SSB exists in the current time slot, perform CTO and CFO compensation on the time-domain sample point data of the current time slot using the CTO and CFO estimated by the most recent TRS or the CTO and CFO filtered by the loop when the CTO and CFO estimated by the SSB are less than or equal to the CTO and CFO estimated by the most recent TRS time slot before or the CTO and CFO filtered by the loop, or perform CTO and CFO compensation on the time-domain sample point data of the current time slot using the CTO and CFO estimated by the SSB;
and the fourth compensation unit is used for deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB or performing CTO and CFO compensation on time-domain sampling point data of the current time slot by using the CTO and the CFO after loop filtering when the TRS and the SSB exist on the current time slot at the same time.
Optionally, the fourth compensation unit is configured to, for the CTO and the CFO, perform time-frequency compensation on the data of the current time slot by using the estimated value of the TRS when the estimated value of the SSB is less than or equal to the estimated value of the TRS.
Optionally, for the CTO and the CFO, when the estimated value of the SSB is greater than the estimated value of the TRS, the fourth compensation unit is configured to compensate the TRS symbol data in the current time slot by using the estimated value of the SSB, perform CTO and CFO estimation based on the compensated TRS symbol, calculate an arithmetic sum of the estimated value of the SSB and the estimated value of the compensated TRS, and perform time-frequency compensation on the data in the current time slot by using a calculation result as a final CTO and CFO.
Optionally, for the CTO and the CFO, when the estimated value of the SSB is greater than the estimated value of the TRS, the fourth compensation unit is configured to calculate a final TRS estimated value based on the estimated value of the SSB and the estimated value of the TRS, and perform time-frequency compensation on the data of the current time slot according to the final TRS estimated value.
Optionally, the fourth compensation unit is configured to determine an estimated value Δ of the SSBSSBThe expression of (a) is:
Figure BDA0001472450140000051
where ρ isSSBIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000052
is the phase angle, in the range (— infinity, + ∞);
determining an estimated value Δ of TRSTRSThe expression of (a) is:
Figure BDA0001472450140000053
where ρ isTRSIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000054
is a phase angle in the range of [ - π, + π]；
By the formula
Figure BDA0001472450140000055
Determining a phase angle corresponding to an estimated value of SSB
Figure BDA0001472450140000056
The expression of (a) is:
Figure BDA0001472450140000057
wherein σ is
Figure BDA0001472450140000061
Number of 2 π contained therein, θSSBIs the remainder;
determining a phase angle corresponding to the final TRS estimated value
Figure BDA0001472450140000062
The expression of (a) is:
Figure BDA0001472450140000063
the final TRS estimate is calculated according to the following formula:
Figure BDA0001472450140000064
in a third aspect, the present invention provides a ue, where the ue includes the joint time-frequency estimation and compensation apparatus.
According to the joint time-frequency estimation and compensation method, device and user equipment provided by the embodiment of the invention, when the TRS and the SSB do not exist in the current time slot, the CTO and the CFO estimated on the previous latest TRS or SSB time slot or the CTO and the CFO after loop filtering are used for performing CTO and CFO compensation on the time domain sampling point data of the current time slot; when only TRS exists on the current time slot, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering; when only SSB exists on the current time slot, when the CTO and the CFO estimated by the SSB are less than or equal to the CTO and the CFO estimated by the last TRS time slot before or the CTO and the CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the last TRS before or the CTO and the CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the SSB; when the TRS and the SSB exist on the current time slot at the same time, corresponding CTO and CFO are deduced according to the CTO and the CFO estimated by the TRS and the SSB, or the CTO and the CFO after loop filtering are used for carrying out CTO and CFO compensation on time domain sampling point data of the current time slot, so that joint time-frequency estimation and compensation based on the TRS and the SSB can be realized, and the receiving performance of a receiver is improved.
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FIG. 1 is a flow chart of a joint time-frequency estimation and compensation method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a joint time-frequency estimation and compensation apparatus according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
An embodiment of the present invention provides a joint time-frequency estimation and compensation method, as shown in fig. 1, the method includes:
s11, judging whether a TRS and an SSB (Synchronization Signal Block) exist on the current time slot, if not, executing a step S12; if only TRS exists in the current timeslot, go to step S13; if only SSB exists in the current timeslot, go to step S14; if the TRS and the SSB exist at the same time on the current time slot, step S15 is executed.
S12, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on the carrier timing deviation (CTO) and the carrier frequency deviation (CFO) estimated on the last TRS or SSB time slot or the CTO and the CFO after loop filtering;
and S13, performing CTO and CFO compensation on the time domain sampling point data of the current time slot based on the TRS estimated CTO and CFO or the loop filtered CTO and CFO.
S14, when the CTO and the CFO estimated by the SSB are less than or equal to the CTO and the CFO estimated by the last TRS time slot or the CTO and the CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the last TRS or the CTO and the CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the SSB;
and S15, deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and CFO after loop filtering.
Specifically, when the SSB estimated value is less than or equal to the TRS estimated value, the CTO and CFO compensation may be performed on the time-domain sample point data of the current time slot using the loop-filtered CTO and CFO.
According to the joint time-frequency estimation and compensation method provided by the embodiment of the invention, when the TRS and the SSB do not exist in the current time slot, the CTO and the CFO are compensated for the time domain sampling point data of the current time slot based on the CTO and the CFO estimated on the previous latest TRS or SSB time slot or the CTO and the CFO after loop filtering; when only TRS exists on the current time slot, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering; when only SSB exists on the current time slot, when the CTO and the CFO estimated by the SSB are less than or equal to the CTO and the CFO estimated by the last TRS time slot before or the CTO and the CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the last TRS before or the CTO and the CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the SSB; when the TRS and the SSB exist on the current time slot at the same time, corresponding CTO and CFO are deduced according to the CTO and the CFO estimated by the TRS and the SSB, or the CTO and the CFO after loop filtering are used for carrying out CTO and CFO compensation on time domain sampling point data of the current time slot, so that joint time-frequency estimation and compensation based on the TRS and the SSB can be realized, and the receiving performance of a receiver is improved.
Specifically, when only the TRS or the SSB exists in the current time slot, the CTO and the CFO compensation are performed on the time domain sampling point data of the current time slot based on the CTO and the CFO estimated by the TRS or the SSB, wherein the time domain sampling point data of the current time slot needs to be stored, and the compensated data is then subjected to other operations such as subsequent channel estimation, demodulation, decoding and the like.
Specifically, when a TRS and an SSB exist in a current time slot at the same time, corresponding CTO and CFO are respectively estimated based on the TRS and the SSB, and when an SSB estimation value (applicable to the CTO and the CFO) is less than or equal to the TRS estimation value, time-frequency compensation is performed on data of the current time slot only by using the estimation value of the TRS; when the SSB estimate is greater than the TRS estimate, the following two processing schemes may be employed:
(1) compensating TRS symbol data on the current time slot by adopting the estimation value of SSB, then performing CTO and CFO estimation based on the compensated TRS symbol, calculating the arithmetic sum of the estimation value of SSB and the estimation value of compensated TRS, and performing time-frequency compensation on the data of the current time slot by taking the calculation result as final CTO and CFO.
(2) Since the estimated value of the SSB varies linearly with respect to the phase angle but the estimation accuracy is much smaller than the TRS, and the estimation accuracy of the TRS is better but the phase angle corresponding to the estimated value varies linearly based on a period of 2 pi, an accurate actual estimated value of the TRS can be derived based on the estimated value of the SSB and the estimated value of the TRS. The detailed process is as follows:
based on the estimation of the SSB, determining an estimated value expression as follows:
Figure BDA0001472450140000091
wherein, DeltaSSBRepresenting SSB estimates (applicable to CTO and CFO), pSSBRepresenting linear coefficients (CTO and CFO have different coefficients when estimated),
Figure BDA0001472450140000092
represents a phase angle, in the range (- ∞, + ∞);
based on the estimation of the TRS, determining an estimated value expression as:
Figure BDA0001472450140000093
wherein, DeltaTRSRepresenting TRS estimates (applicable to CTO and CFO), pTRSRepresenting linear coefficients (CTO and CFO have different coefficients when estimated),
Figure BDA0001472450140000101
represents a phase angle in the range of [ - π, + π]；
To indicate that the SSB phase angle includes σ 2 pi, the following equation can be expressed:
Figure BDA0001472450140000102
wherein theta isSSBIs the remainder.
And a more accurate TRS phase angle
Figure BDA0001472450140000103
Can be expressed as the following equation:
Figure BDA0001472450140000104
based on equation (4), the more accurate actual estimate of TRS is determined as:
Figure BDA0001472450140000105
and finally, performing time-frequency compensation on the data of the current time slot based on the more accurate actual estimated value of the TRS obtained by the formula (5).
An embodiment of the present invention further provides a joint time-frequency estimation and compensation apparatus, as shown in fig. 2, the apparatus includes:
a judging unit 11, configured to judge whether a TRS and an SSB exist in a current timeslot at the same time;
a first compensation unit 12, configured to perform, when there is no TRS or SSB in a current timeslot, CTO and CFO compensation on time-domain sample point data of the current timeslot based on a CTO and a CFO estimated on a most recent TRS or SSB timeslot or a CTO and a CFO after loop filtering;
a second compensation unit 13, configured to perform CTO and CFO compensation on time-domain sampling point data of a current time slot based on a CTO and a CFO estimated by a TRS or a CTO and a CFO after loop filtering when only the TRS exists in the current time slot;
a third compensating unit 14, configured to, when only an SSB exists in the current timeslot, and when the CTO and the CFO estimated by the SSB are less than or equal to the CTO and the CFO estimated by the most recent TRS timeslot or the CTO and the CFO after loop filtering, perform CTO and CFO compensation on the time-domain sample point data of the current timeslot by using the CTO and the CFO estimated by the most recent TRS timeslot or the CTO and the CFO after loop filtering, and otherwise perform CTO and CFO compensation on the time-domain sample point data of the current timeslot by using the CTO and the CFO estimated by the SSB;
a fourth compensation unit 15, configured to, when a TRS and an SSB coexist on a current time slot, derive a corresponding CTO and a corresponding CFO according to the CTO and the CFO estimated by the TRS and the SSB, or perform CTO and CFO compensation on time-domain sampling point data of the current time slot by using the CTO and the CFO after loop filtering.
According to the joint time-frequency estimation and compensation device provided by the embodiment of the invention, when the TRS and the SSB do not exist in the current time slot, the CTO and CFO compensation is carried out on the time domain sampling point data of the current time slot based on the CTO and CFO estimated on the previous latest TRS or SSB time slot or the CTO and CFO after loop filtering; when only TRS exists on the current time slot, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering; when only SSB exists on the time slot, when the CTO and the CFO estimated by the SSB are less than or equal to the CTO and the CFO estimated by the last TRS time slot before or the CTO and the CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the last TRS before or the CTO and the CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and the CFO estimated by the SSB; when the TRS and the SSB exist on the current time slot at the same time, corresponding CTO and CFO are deduced according to the CTO and the CFO estimated by the TRS and the SSB, or the CTO and the CFO after loop filtering are used for carrying out CTO and CFO compensation on time domain sampling point data of the current time slot, so that joint time-frequency estimation and compensation based on the TRS and the SSB can be realized, and the receiving performance of a receiver is improved.
Optionally, the fourth compensation unit 15 is configured to, for the CTO and the CFO, perform time-frequency compensation on the data of the current time slot by using the estimated value of the TRS when the estimated value of the SSB is less than or equal to the estimated value of the TRS.
Optionally, the fourth compensation unit 15 is configured to, for the CTO and the CFO, when the estimated value of the SSB is greater than the estimated value of the TRS, compensate the TRS symbol data in the current time slot by using the estimated value of the SSB, perform CTO and CFO estimation based on the compensated TRS symbol, calculate an arithmetic sum of the estimated value of the SSB and the estimated value of the compensated TRS, and perform time-frequency compensation on the data in the current time slot by using a calculation result as a final CTO and a final CFO.
Optionally, the fourth compensating unit 15 is configured to, for the CTO and the CFO, when the estimated value of the SSB is greater than the estimated value of the TRS, calculate a final TRS estimated value based on the estimated value of the SSB and the estimated value of the TRS, and perform time-frequency compensation on the data of the current time slot according to the final TRS estimated value.
Optionally, the fourth compensation unit 15 is configured to determine an estimated value Δ of the SSBSSBThe expression of (a) is:
Figure BDA0001472450140000121
where ρ isSSBIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000122
is the phase angle, in the range (— infinity, + ∞);
determining an estimated value Δ of TRSTRSThe expression of (a) is:
Figure BDA0001472450140000123
where ρ isTRSIs a linear coefficient, and the linear coefficient,
Figure BDA0001472450140000124
is a phase angle in the range of [ - π, + π]；
By the formula
Figure BDA0001472450140000125
Determining a phase angle corresponding to an estimated value of SSB
Figure BDA0001472450140000126
The expression of (a) is:
Figure BDA0001472450140000127
wherein σ is
Figure BDA0001472450140000128
Number of 2 π contained therein, θSSBIs the remainder;
determining a phase angle corresponding to the final TRS estimated value
Figure BDA0001472450140000129
The expression of (a) is:
Figure BDA0001472450140000131
the final TRS estimate is calculated according to the following formula:
Figure BDA0001472450140000132
the apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
The embodiment of the invention also provides user equipment which comprises the joint time frequency estimation and compensation device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. A method for joint time-frequency estimation and compensation, comprising:
judging whether a tracking reference signal TRS and a synchronous signal block SSB exist on the current time slot or not;
if the current time slot does not have the TRS and the SSB, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on carrier timing deviation (CTO) and carrier frequency deviation (CFO) estimated on the most recent TRS or SSB time slot or CTO and CFO after loop filtering;
if only TRS exists on the current time slot, performing CTO and CFO compensation on time domain sampling point data of the current time slot based on CTO and CFO estimated by TRS or CTO and CFO after loop filtering;
if only SSB exists on the current time slot, when the CTO and CFO estimated by the SSB are less than or equal to the CTO and CFO estimated by the last TRS time slot before or the CTO and CFO after loop filtering, performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and CFO estimated by the last TRS before or the CTO and CFO after loop filtering, or performing CTO and CFO compensation on the time domain sampling point data of the current time slot by using the CTO and CFO estimated by the SSB;
if the TRS and the SSB exist on the current time slot at the same time, deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB or performing CTO and CFO compensation on time domain sampling point data of the current time slot by using the CTO and CFO after loop filtering.
2. The method of claim 1, wherein the deriving the CTO and CFO from the estimated CTO and CFO of the TRS and SSB to compensate the time-domain sample point data of the current slot for the CTO and CFO comprises:
and for the CTO and the CFO, when the estimated value of the SSB is less than or equal to the estimated value of the TRS, performing time-frequency compensation on the data of the current time slot by adopting the estimated value of the TRS.
3. The method of claim 1, wherein the deriving the CTO and CFO from the estimated CTO and CFO of the TRS and SSB to compensate the time-domain sample point data of the current slot for the CTO and CFO comprises:
and for the CTO and the CFO, when the estimated value of the SSB is larger than the estimated value of the TRS, compensating the TRS symbol data on the current time slot by adopting the estimated value of the SSB, estimating the CTO and the CFO based on the compensated TRS symbol, calculating the arithmetic sum of the estimated value of the SSB and the estimated value of the compensated TRS, and performing time-frequency compensation on the data of the current time slot by taking the calculation result as the final CTO and CFO.
4. The method of claim 1, wherein the deriving the CTO and CFO from the estimated CTO and CFO of the TRS and SSB to compensate the time-domain sample point data of the current slot for the CTO and CFO comprises:
and for the CTO and the CFO, when the SSB estimated value is larger than the TRS estimated value, calculating a final TRS estimated value based on the SSB estimated value and the TRS estimated value, and performing time-frequency compensation on the data of the current time slot according to the final TRS estimated value.
5. The method of claim 4, wherein the calculating a final TRS estimate based on the SSB estimate and the TRS estimate comprises:
determining an estimate Δ for SSBSSBThe expression of (a) is:
Figure FDA0002812072140000021
where ρ isSSBIs a linear coefficient, and the linear coefficient,
Figure FDA0002812072140000022
is the phase angle, in the range (— infinity, + ∞);
determining an estimated value Δ of TRSTRSThe expression of (a) is:
Figure FDA0002812072140000023
where ρ isTRSIs a linear coefficient, and the linear coefficient,
Figure FDA0002812072140000024
is a phase angle in the range of [ - π, + π]；
By the formula
Figure FDA0002812072140000025
Determining a phase angle corresponding to an estimated value of SSB
Figure FDA0002812072140000026
The expression of (a) is:
Figure FDA0002812072140000031
wherein σ is
Figure FDA0002812072140000032
Number of 2 π contained therein, θSSBIs the remainder;
determining a phase angle corresponding to the final TRS estimated value
Figure FDA0002812072140000033
The expression of (a) is:
Figure FDA0002812072140000034
the final TRS estimate is calculated according to the following formula:
Figure FDA0002812072140000035
6. a joint time-frequency estimation and compensation apparatus, comprising:
the judging unit is used for judging whether the TRS and the SSB exist on the current time slot or not;
a first compensation unit, configured to perform, when a TRS and an SSB do not exist in a current timeslot, CTO and CFO compensation on time-domain sample point data of the current timeslot based on a CTO and a CFO estimated on a most recent TRS or SSB timeslot before or a CTO and a CFO after loop filtering;
a second compensation unit, configured to perform CTO and CFO compensation on time-domain sample point data of a current time slot based on a CTO and a CFO estimated by a TRS or a CTO and a CFO after loop filtering when only the TRS exists in the current time slot;
a third compensation unit, configured to, when only an SSB exists in the current time slot, perform CTO and CFO compensation on the time-domain sample point data of the current time slot using the CTO and CFO estimated by the most recent TRS or the CTO and CFO filtered by the loop when the CTO and CFO estimated by the SSB are less than or equal to the CTO and CFO estimated by the most recent TRS time slot before or the CTO and CFO filtered by the loop, or perform CTO and CFO compensation on the time-domain sample point data of the current time slot using the CTO and CFO estimated by the SSB;
and the fourth compensation unit is used for deducing corresponding CTO and CFO according to the CTO and CFO estimated by the TRS and the SSB or performing CTO and CFO compensation on time-domain sampling point data of the current time slot by using the CTO and the CFO after loop filtering when the TRS and the SSB exist on the current time slot at the same time.
7. The apparatus of claim 6, wherein the fourth compensation unit is configured to perform time-frequency compensation on the data of the current time slot by using the estimated value of the TRS when the estimated value of the SSB is less than or equal to the estimated value of the TRS for the CTO and the CFO.
8. The apparatus of claim 6, wherein the fourth compensation unit is configured to, for CTO and CFO, compensate TRS symbol data in the current time slot by using the estimated value of SSB when the estimated value of SSB is greater than the estimated value of TRS, perform CTO and CFO estimation again based on the compensated TRS symbol, calculate an arithmetic sum of the estimated value of SSB and the estimated value of compensated TRS, and perform time-frequency compensation on the data in the current time slot by using the calculation result as final CTO and CFO.
9. The apparatus according to claim 6, wherein the fourth compensation unit is configured to, for the CTO and the CFO, calculate a final TRS estimation value based on the SSB estimation value and the TRS estimation value when the SSB estimation value is greater than the TRS estimation value, and perform time-frequency compensation on the data of the current slot according to the final TRS estimation value.
10. The apparatus of claim 9, wherein the fourth compensation unit is configured to determine an estimated value Δ of SSBSSBThe expression of (a) is:
Figure FDA0002812072140000041
where ρ isSSBIs a linear coefficient, and the linear coefficient,
Figure FDA0002812072140000042
is the phase angle, in the range (— infinity, + ∞);
determining an estimated value Δ of TRSTRSThe expression of (a) is:
Figure FDA0002812072140000043
where ρ isTRSIs a linear coefficient, and the linear coefficient,
Figure FDA0002812072140000044
is a phase angle in the range of [ - π, + π]；
By the formula
Figure FDA0002812072140000058
Determining a phase angle corresponding to an estimated value of SSB
Figure FDA0002812072140000052
The expression of (a) is:
Figure FDA0002812072140000053
wherein σ is
Figure FDA0002812072140000054
Number of 2 π contained therein, θSSBIs the remainder;
determining a phase angle corresponding to the final TRS estimated value
Figure FDA0002812072140000055
The expression of (a) is:
Figure FDA0002812072140000056
the final TRS estimate is calculated according to the following formula:
Figure FDA0002812072140000057
11. a user equipment, characterized in that the user equipment comprises the joint time-frequency estimation and compensation apparatus according to any one of claims 6 to 10.
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