CN112702290B - Channel estimation method and device - Google Patents
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Abstract
The present specification provides a channel estimation method and apparatus, the method comprising: receiving a frequency domain signal, acquiring first DMRS pilot data of the frequency domain signal, acquiring first channel estimation values of all subcarriers of a corresponding pilot position according to the first DMRS pilot data and local DMRS pilot data, determining a DMRS port, acquiring a second channel estimation value through orthogonal despreading of the first channel estimation value, performing time offset estimation according to the second channel estimation value to obtain a time offset value, performing time offset compensation on the first channel estimation value by using the time offset value, performing orthogonal despreading on the channel estimation value after the time offset compensation again to obtain a third channel estimation value, and performing channel estimation on the rest subcarriers of the frequency domain by using the third channel estimation value. By the method, the 5G multi-stream code division DMRS system can be subjected to accurate channel estimation.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and in particular, to a channel estimation method and device.
Background
In an NR (New Radio) system specified by 3GPP (3rd Generation Partnership Project), PUSCH (Physical Uplink Shared Channel) is used to carry transmission of Uplink traffic data. A Reference Signal DMRS (Demodulation Reference Signal) carried by the PUSCH is mainly used for uplink channel estimation and Demodulation at the base station.
The 5G system needs better time synchronization when performing uplink and downlink communication between the terminal user and the base station, but usually does not achieve complete alignment, on one hand, the terminal user may be in a dynamic moving process, and on the other hand, due to the influence factor of the propagation characteristic of the wireless channel, the uplink transmission time of the terminal user and the base station cannot be completely aligned, so that time offset exists, and a high error rate of the receiving end during signal demodulation may be caused. These constraints require the receiver to achieve accurate synchronization of the received signal for accurate signal estimation and equalization.
The multi-stream code division and the multi-stream frequency division of the 5G PUSCH channel are important characteristics, and the multi-stream demodulation performance has extremely high requirements on the accuracy of channel estimation. In particular, for multi-stream code division systems, orthogonality between code channels needs to be considered, and time offset may destroy orthogonality between code channels, thereby affecting channel estimation accuracy and demodulation performance.
Disclosure of Invention
The present disclosure provides a channel estimation method and device, by which a 5G multi-stream code division DMRS system can be accurately channel-estimated.
The embodiment of the disclosure provides a channel estimation method, which includes:
receiving a frequency domain signal, and acquiring first DMRS pilot data of the frequency domain signal;
acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
determining a DMRS port, and obtaining a second channel estimation value through orthogonal despreading of the first channel estimation value;
performing time offset estimation according to the second channel estimation value to obtain a time offset value, performing time offset compensation on the first channel estimation value by using the time offset value, performing orthogonal de-spreading on the channel estimation value after the time offset compensation again, and obtaining a third channel estimation value;
performing channel estimation on the rest subcarriers of the frequency domain by using a third channel estimation value;
and the second channel estimation value is a channel estimation value of each DMRS port.
Specifically, the receiving a frequency domain signal and acquiring the first DMRS pilot data of the frequency domain signal includes:
receiving a frequency domain signal sent by a sending terminal, and acquiring first DMRS pilot data of the frequency domain signal through an appointed time-frequency domain position.
Specifically, the local DMRS pilot data is pilot data that is configured locally and is not transmitted through a channel.
Optionally, the obtaining the first channel estimation values of all subcarriers at the corresponding pilot positions according to the first DMRS pilot data and the local DMRS pilot data includes:
carrying out conjugate multiplication on the first DMRS pilot data and the local DMRS pilot data to obtain first channel estimation values of all subcarriers corresponding to pilot positions;
wherein, the pilot frequency position refers to a time frequency domain position allocated to a user by a management layer.
Optionally, the determining the DMRS port and obtaining the second channel estimation value by orthogonally despreading the first channel estimation value include:
acquiring a port number of a DMRS port;
and carrying out orthogonal despreading on the first channel estimation value according to the port number to obtain a second channel estimation value.
Optionally, the performing time offset estimation according to the second channel estimation value includes:
performing IFFT on the second channel estimation value to transform to a time domain, and determining a time offset estimation value according to the value of the maximum peak value position; or,
and performing conjugate multiplication on adjacent channel estimation values in the second channel estimation value, accumulating the conjugate multiplication values, and determining the time offset estimation value according to the accumulated value.
Optionally, performing time offset estimation according to the second channel estimation value to obtain a time offset value, and performing time offset compensation on the first channel estimation value by using the time offset value, including:
performing time offset estimation according to the second channel estimation value to obtain a time offset value;
and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
By the method, the frequency domain initial channel estimation is preprocessed, so that frequency spectrum leakage caused by IFFT is avoided, and the accuracy of channel estimation is improved.
An embodiment of the present disclosure further provides an apparatus, including:
a receiving unit, configured to receive a frequency domain signal and acquire first DMRS pilot data of the frequency domain signal;
the first processing unit is used for acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
a second processing unit, configured to determine a DMRS port, and obtain a second channel estimation value by performing orthogonal despreading on the first channel estimation value;
a third processing unit, configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value, perform time offset compensation on the first channel estimation value by using the time offset value, perform orthogonal despreading on the time offset-compensated channel estimation value again, and obtain a third channel estimation value;
a fourth processing unit, configured to perform channel estimation on the remaining subcarriers in the frequency domain by using the third channel estimation value;
and the second channel estimation value is a channel estimation value of each DMRS port.
Optionally, the receiving unit is specifically configured to receive a frequency domain signal sent by a sending end, and obtain the first DMRS pilot data of the frequency domain signal through an appointed time-frequency domain position.
Optionally, the local DMRS pilot data is pilot data configured locally and not transmitted through a channel.
Optionally, the third processing unit is specifically configured to perform IFFT on the second channel estimation value to transform to a time domain, and determine a time offset estimation value according to a value of a maximum peak position; or,
and performing conjugate multiplication on adjacent channel estimation values in the second channel estimation value, accumulating the conjugate multiplication values, and determining the time offset estimation value according to the accumulated value.
Optionally, the third processing unit is specifically configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value;
and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a schematic flow chart of a channel estimation method according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of channel estimation according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the specification, as detailed in the appended claims.
The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this specification 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 also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present specification. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
At present, when a terminal user and a base station have time offset, a received reference signal DMRS and a preset standard DMRS may be subjected to a division operation to obtain initial channel estimation information of each effective subcarrier; and performing conjugate operation on the initial channel estimation information of two adjacent subcarriers in each effective subcarrier to determine time offset compensation information, compensating the initial channel estimation according to the time offset compensation information to obtain target channel estimation information of each effective subcarrier in an uplink channel, and determining the channel estimation information of all subcarriers of the uplink channel according to the target channel estimation information by adopting an interpolation method.
However, the method only obtains initial channel estimation information in a frequency domain, and is difficult to meet the demodulation performance of 5G uplink dual-stream, and the channel estimation accuracy needs to be improved; on the other hand, in a time offset scene of the 5G multi-stream code division DMRS, the scheme is not applicable, and the time offset destroys the orthogonality of the code division, so that it is difficult to separate the two-stream code division.
In another embodiment, based on uplink channel estimation of a DMRS, LS least squares channel estimation is performed in a frequency domain to obtain a preliminary channel estimation result of each effective subcarrier, MMSE minimum mean square error channel estimation is performed to improve accuracy of channel estimation, IFFT inverse transformation is performed on a frequency domain channel estimation result, a channel outside a channel duration is truncated by using time limitation of channel impulse response, zero is forcibly set, noise energy is reduced, and finally FFT transformation is performed to return to the frequency domain to obtain final target channel estimation information of each effective subcarrier.
However, when the time offset exists, the frequency spectrum leakage is caused by performing the IFFT on the frequency domain channel estimation result, and the frequency spectrum leakage does not occur only when the sampling point divided by the time offset is an integral multiple of the number of IFFT points, otherwise, the energy of each multipath is dispersed to all the sampling points, the leakage becomes more obvious as the number of RB (Resource Blocks) becomes smaller, the channel except for the channel duration is truncated, and finally, the FFT is performed to return to the frequency domain, so that the channel estimation accuracy becomes worse, and it is difficult to meet the final demodulation performance; on the other hand, the scheme is not suitable for the DMRS scene with 5G multi-stream code division.
In order to solve the above technical problem, an embodiment of the present disclosure provides a channel estimation method, as shown in fig. 1, the method including:
s101, receiving a frequency domain signal, and acquiring first DMRS pilot data of the frequency domain signal;
s102, acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
s103, determining a DMRS port, and obtaining a second channel estimation value through orthogonal despreading on the first channel estimation value;
s104, performing time offset estimation according to the second channel estimation value to obtain a time offset value, performing time offset compensation on the first channel estimation value by using the time offset value, and performing orthogonal despreading on the channel estimation value after the time offset compensation to obtain a third channel estimation value;
and S105, performing channel estimation on the rest subcarriers of the frequency domain by using the third channel estimation value.
And the second channel estimation value is a channel estimation value of each DMRS port.
In step S101, a frequency domain signal sent by a sending end is received, and first DMRS pilot data of the frequency domain signal is obtained through a specified time-frequency domain position of the frequency domain signal. Specifically, according to the time-frequency domain position allocated to the user by the higher layer of the protocol 38.211, corresponding DMRS pilot data can be extracted at the position where the pilot data is correspondingly placed. That is to say, the first DMRS pilot data is carried at a specified position in the frequency domain signal, and the first DMRS pilot data (hereinafter referred to as the first DMRS) acquired here is pilot data after channel transmission.
In step S102, channel estimation is performed according to the least square criterion by using the first DMRS acquired from the frequency domain signal and the local DMRS pilot data (hereinafter referred to as the local DMRS), that is, the first DMRS and the local DMRS are conjugate-multiplied, so as to obtain channel estimates (i.e., first channel estimate values) of all subcarriers at the pilot position, where the first channel estimate value is expressed as a first channel estimate value
。
Here, the local DMRS is pilot data that is specified by the protocol 38.211 and is not transmitted through a channel.
In step S103, a DMRS port is determined, specifically, a transmitting antenna using the DMRS port is adopted according to the 3GPP protocol 38.211.
The obtaining of the second channel estimation value through orthogonal despreading of the first channel estimation value includes forming code packets according to the port number of the DMRS port, and performing orthogonal despreading on the first channel estimation value according to the port number to obtain the second channel estimation value.
For example, assuming that DMRS ports adopted by two transmitting antennas are [ 01 ], that is, code packets, de-spreading the two code packets by using a de-orthogonal algorithm to obtain respective channel estimation values, specifically as follows:
taking DMRS Type1 as an example, the adjacent DMRS subcarrier received signals are:
in the formula,
which represents the sub-carriers 0 and 2,
the symbol is represented by a symbol that,
which is indicative of a receiving antenna,
and
indicates the number of the DMRS port,
the representation of the noise is represented by,
a reference to a DMRS local sequence is indicated,
representing the received DMRS signal.
Assuming that the adjacent pilot channel estimates for the same antenna port are equal:
ignoring noise
The channel estimation results are as follows:
thereby obtaining a respective channel estimate for each port.
In step S104, the time offset estimation may be performed in a time domain or a frequency domain, and thus, when the time offset estimation is performed according to the second channel estimation value, the following manner may be implemented.
Mode 1: when time offset estimation is carried out in the time domain, the second channel estimation value is subjected to IFFT conversion to the time domain, and the time offset estimation value is determined according to the value of the maximum peak position; or,
mode 2: when the time offset estimation is performed in the frequency domain, conjugate multiplication is performed on adjacent channel estimation values in the second channel estimation value, the conjugate multiplication values are accumulated, and the time offset estimation value is determined according to the accumulated value, wherein the determination of the time offset estimation value according to the accumulated value specifically comprises the following steps: and accumulating to obtain the phase offset, and then calculating the angle of the phase offset to convert the phase offset into the time offset.
And after the time offset estimation, obtaining a corresponding time offset value, and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
Namely, the time offset compensation is carried out on the first channel estimation value according to the time offset value so as to make up for the influence caused by the time offset, recover the orthogonality of the code division and ensure the performance of solving the orthogonality. The embodiment provides a time offset compensation formula, which specifically includes:
in the formula,
which represents the sub-carriers of the data stream,
the symbol is represented by a symbol that,
which is indicative of a receiving antenna,
and performing time offset compensation according to the actual position of each subcarrier for the time offset estimation value.
The above embodiment is a procedure for performing de-orthogonalization and time offset compensation (referred to as de-orthogonalization 1) on the first channel estimation value, and the procedure for performing de-orthogonalization again on the de-orthogonalization 1 (referred to as de-orthogonalization 2) is the same as that described above, and thus, the description thereof is omitted.
In step S105, in order to obtain better channel estimation, denoising is performed after solving quadrature 2, and the influence of noise is removed to obtain a more accurate channel estimation value, where a channel estimation scheme of a transform domain is used.
Firstly, the channel estimation value obtained by solving the orthogonal 2 is subjected to IFFT transformation, and because the time offset compensation is already completed in the process, the IFFT transformation does not bring spectrum leakage.
And then windowing and denoising are carried out in a transform domain, the length of a window can be changed according to different modulation modes, different modulation orders and different numbers of subcarriers, for simplicity of implementation, the window length can be obtained through simulation and then stored in a receiving end, the corresponding window length is taken out according to different configurations, and the windowing mode can also adopt various modes, such as a rectangular window or a Hamming window. The simple denoising scheme may employ signal retention in the window, and all signals outside the window are set to zero, or an optimized scheme may be employed, and signals smaller than a threshold in the window are also set to zero to remove noise in the window. And finally, carrying out FFT (fast Fourier transform) on the windowed and denoised signal to obtain a channel estimation value of a frequency domain.
And after the channel estimation value of the subcarrier where the DMRS is located is obtained, interpolation is needed to be carried out in a frequency domain to obtain the channel estimation values of the rest subcarriers, wherein the rest subcarriers are the subcarriers at the positions other than the DMRS, and the channel estimation of the rest subcarriers in the frequency domain is to obtain the channel estimation values of the subcarriers at the positions other than the DMRS. There are many frequency domain interpolation schemes, and the channel estimation values of the other subcarriers can be obtained by adopting a direct copying scheme, or can be obtained by a linear interpolation or gaussian interpolation mode.
And interpolating the channel estimation value of the obtained symbol where the DMRS is located in the time domain to obtain the channel estimation values of the other symbols. There are many time domain interpolation schemes, which can directly copy the nearby symbol principle to obtain the channel estimation values of all symbols, or can use a linear interpolation mode, for example, there are two DMRS symbols at this time
Can find the data symbol
Interpolation coefficient of
E.g. when there are three DMRS symbols
Can find the data symbol
Interpolation coefficient of
Thus, the complete channel estimation values of all sub-carriers of all symbols can be obtained.
For ease of understanding, a flowchart corresponding to the above-described flow is also provided in the present embodiment, as shown in fig. 2.
As shown in fig. 2, the LS estimation obtains a first channel estimation value, the de-spread second channel estimation value is obtained by de-orthogonalizing 1 on the first channel estimation value, the time offset estimation is obtained and time offset compensation is performed in step S104, and the de-orthogonalizing is performed on the channel estimation value after the time offset compensation again (i.e., de-orthogonalizing 2 is not repeated because the process of de-orthogonalizing 2 is the same as the process of de-orthogonalizing 1)
After the solution orthogonal 2 is obtained, channel estimation values of other symbols are obtained through methods such as frequency domain interpolation, and therefore channel estimation values of all subcarriers of all symbols are obtained.
According to the embodiment, the frequency spectrum leakage caused by IFFT is avoided by preprocessing the initial channel estimation of the frequency domain in the scheme disclosed by the invention, the precision of channel estimation is improved, and compared with the current scheme, the larger the time offset is, the larger the gain is, and the demodulation performance gain larger than 1-2 dB can be obtained. Meanwhile, the scheme disclosed by the invention is suitable for a multi-stream code division scene, and can accurately separate the code division to obtain accurate channel estimation information.
The disclosed embodiment provides a device, which may be a base station device or a management device communicated with the base station device, and the device includes:
a receiving unit, configured to receive a frequency domain signal and acquire first DMRS pilot data of the frequency domain signal;
the first processing unit is used for acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
a second processing unit, configured to determine a DMRS port, and obtain a second channel estimation value by performing orthogonal despreading on the first channel estimation value;
a third processing unit, configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value, perform time offset compensation on the first channel estimation value by using the time offset value, perform orthogonal despreading on the time offset-compensated channel estimation value again, and obtain a third channel estimation value;
a fourth processing unit, configured to perform channel estimation on the remaining subcarriers in the frequency domain by using the third channel estimation value;
and the second channel estimation value is a channel estimation value of each DMRS port.
Optionally, the receiving unit is specifically configured to receive a frequency domain signal sent by a sending end, and obtain the first DMRS pilot data of the frequency domain signal through an appointed time-frequency domain position.
Optionally, the local DMRS pilot data is pilot data configured locally and not transmitted through a channel.
Optionally, the third processing unit is specifically configured to perform IFFT on the second channel estimation value to transform to a time domain, and determine a time offset estimation value according to a value of a maximum peak position; or,
and performing conjugate multiplication on adjacent channel estimation values in the second channel estimation value, accumulating the conjugate multiplication values, and determining the time offset estimation value according to the accumulated value.
Optionally, the third processing unit is specifically configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value;
and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Other embodiments of the present description will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This specification is intended to cover any variations, uses, or adaptations of the specification following, in general, the principles of the specification and including such departures from the present disclosure as come within known or customary practice within the art to which the specification pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the specification being indicated by the following claims.
It will be understood that the present description is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (11)
1. A method of channel estimation, the method comprising:
receiving a frequency domain signal, and acquiring first DMRS pilot data of the frequency domain signal;
acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
determining a DMRS port, and obtaining a second channel estimation value through orthogonal despreading of the first channel estimation value;
performing time offset estimation according to the second channel estimation value to obtain a time offset value, performing time offset compensation on the first channel estimation value by using the time offset value, performing orthogonal de-spreading on the channel estimation value after the time offset compensation again, and obtaining a third channel estimation value;
performing channel estimation on the rest subcarriers of the frequency domain by using a third channel estimation value;
wherein the second channel estimation value is a channel estimation value of each DMRS port;
wherein determining the DMRS port and obtaining a second channel estimate by orthogonal despreading the first channel estimate comprises:
acquiring a port number of a DMRS port;
and carrying out orthogonal despreading on the first channel estimation value according to the port number to obtain a second channel estimation value.
2. The method of claim 1, wherein the receiving the frequency-domain signal and obtaining the first DMRS pilot data for the frequency-domain signal comprises:
receiving a frequency domain signal sent by a sending terminal, and acquiring first DMRS pilot data of the frequency domain signal through an appointed time-frequency domain position.
3. The method of claim 1, wherein the local DMRS pilot data is pilot data that is configured locally and that has not been transmitted over a channel.
4. The method of claim 1, wherein obtaining a first channel estimate for all subcarriers for a corresponding pilot location based on the first DMRS pilot data and local DMRS pilot data comprises:
carrying out conjugate multiplication on the first DMRS pilot data and the local DMRS pilot data to obtain first channel estimation values of all subcarriers corresponding to pilot positions;
wherein, the pilot frequency position refers to a time frequency domain position allocated to a user by a management layer.
5. The method of claim 1, wherein the estimating the time offset according to the second channel estimation value comprises:
performing IFFT on the second channel estimation value to transform to a time domain, and determining a time offset estimation value according to the value of the maximum peak value position; or,
and performing conjugate multiplication on adjacent channel estimation values in the second channel estimation value, accumulating the conjugate multiplication values, and determining the time offset estimation value according to the accumulated value.
6. The method of claim 1, wherein performing a time offset estimation according to the second channel estimation value to obtain a time offset value, and performing a time offset compensation on the first channel estimation value by using the time offset value comprises:
performing time offset estimation according to the second channel estimation value to obtain a time offset value;
and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
7. A base station apparatus, characterized in that the apparatus comprises:
a receiving unit, configured to receive a frequency domain signal and acquire first DMRS pilot data of the frequency domain signal;
the first processing unit is used for acquiring first channel estimation values of all subcarriers corresponding to pilot positions according to the first DMRS pilot data and the local DMRS pilot data;
a second processing unit, configured to determine a DMRS port, and obtain a second channel estimation value by performing orthogonal despreading on the first channel estimation value;
a third processing unit, configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value, perform time offset compensation on the first channel estimation value by using the time offset value, perform orthogonal despreading on the time offset-compensated channel estimation value again, and obtain a third channel estimation value;
a fourth processing unit, configured to perform channel estimation on the remaining subcarriers in the frequency domain by using the third channel estimation value;
wherein the second channel estimation value is a channel estimation value of each DMRS port;
wherein determining the DMRS port and obtaining a second channel estimate by orthogonal despreading the first channel estimate comprises:
acquiring a port number of a DMRS port;
and carrying out orthogonal despreading on the first channel estimation value according to the port number to obtain a second channel estimation value.
8. The apparatus of claim 7,
the receiving unit is specifically configured to receive a frequency domain signal sent by a sending end, and obtain first DMRS pilot data of the frequency domain signal through an appointed time-frequency domain position.
9. The apparatus of claim 7, wherein the local DMRS pilot data is pilot data that is configured locally and that has not been transmitted over a channel.
10. The apparatus of claim 7,
the third processing unit is specifically configured to perform IFFT on the second channel estimation value to transform to a time domain, and determine a time offset estimation value according to a value of the maximum peak position; or,
and performing conjugate multiplication on adjacent channel estimation values in the second channel estimation value, accumulating the conjugate multiplication values, and determining the time offset estimation value according to the accumulated value.
11. The apparatus of claim 7,
the third processing unit is specifically configured to perform time offset estimation according to the second channel estimation value to obtain a time offset value;
and performing time offset compensation on the actual position of each subcarrier according to the time offset value and the first channel estimation value.
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