CN113556772A - Channel prediction method and device - Google Patents

Channel prediction method and device Download PDF

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CN113556772A
CN113556772A CN202010337786.1A CN202010337786A CN113556772A CN 113556772 A CN113556772 A CN 113556772A CN 202010337786 A CN202010337786 A CN 202010337786A CN 113556772 A CN113556772 A CN 113556772A
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srs
subframe
channel coefficient
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estimated value
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CN113556772B (en
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秦一平
王勃
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract

The application provides a channel prediction method and a channel prediction device. The method comprises the following steps: performing channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the sub-frame before the tth sub-frame received from the terminal equipment to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame, performing channel estimation according to the SRS of the tth sub-frame received from the terminal equipment, performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth sub-frame, and performing channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the SRS of the tth subframe is received.

Description

Channel prediction method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a channel prediction method and apparatus.
Background
With the development of communication technology, a new 5G air interface (new radio, NR) adopts a multi-user multiple input multiple output (MU MIMO) technology, and MU MIMO users can multiplex the same time domain resource and frequency domain resource, thereby greatly improving system capacity. When the spatial degree of freedom is sufficient and the base station knows downlink Channel State Information (CSI), the base station may avoid inter-user interference by precoding a signal transmitted to the terminal device, thereby implementing space division multiplexing. In a Time Division Duplex (TDD) system, a base station estimates uplink CSI by using a Sounding Reference Signal (SRS) transmitted by a terminal, and applies to downlink precoding according to channel reciprocity. Due to the change of terminal movement and communication environment, the situation that the channel at the SRS transmission time is inconsistent with the channel at the downlink signal transmission time, that is, the channel outdating problem often occurs, so that the precoding is not matched with the actual channel, interference between users is generated, and the system capacity is seriously affected. In order to reduce the loss caused by channel outdating, the channel of the downlink signal transmission time can be estimated through channel prediction, and the channel prediction specifically means that the base station predicts the channel coefficient of the future downlink signal transmission time according to the estimated value of the channel coefficient of the current time and the estimated value of the channel coefficient of the historical time. However, since the SRS transmitted by the terminal device may be affected by random information unknown to the base station, for example, the random information includes a random phase introduced by a terminal power amplifier switch, a radio frequency device, and the like, and a random timing adjustment amount caused by the terminal device automatically adjusting the SRS transmission timing, and the like, an estimated value of the channel coefficient may also be affected by the random information accordingly, resulting in a performance degradation of channel prediction. Therefore, reducing the interference to channel prediction by the amount of random phase and random timing adjustment is a problem that must be solved when channel prediction is actually used.
In an existing solution, a base station performs estimation and compensation of a random timing adjustment amount and estimation and compensation of a phase after channel estimation and before channel prediction, and the specific process is as follows: after obtaining the estimated value of the channel coefficient corresponding to the SRS of the current subframe, the base station performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the estimated value of the timing adjustment of the SRS of the current subframe relative to the SRS of the previous subframe, and obtains the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the current subframe. And then the base station performs phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the current subframe according to the estimated value of the phase difference between the SRS of the current subframe and the SRS of the previous subframe to obtain the estimated values of the channel coefficient after the timing adjustment amount compensation and the phase compensation corresponding to the SRS of the current subframe.
However, in a real environment, a channel may change over time and the channel may be interfered by noise, interference factors of the estimated value of the timing adjustment amount and the estimated value of the phase difference also include channel variation and noise, and the timing adjustment amount compensation and the phase compensation are performed by using the estimated value of the timing adjustment amount and the estimated value of the phase difference which are interfered by the channel variation and the noise, so that accuracy is not high, and performance of channel prediction may be poor.
Disclosure of Invention
The application provides a channel prediction method and a channel prediction device, which can improve the accuracy of timing adjustment compensation and phase compensation and ensure the performance of channel prediction.
In a first aspect, the present application provides a channel prediction method, including:
after receiving measurement information corresponding to a Sounding Reference Signal (SRS) of a t-1 th subframe from a terminal device, a network device performs channel prediction according to an estimated value and the measurement information of a channel coefficient corresponding to each SRS of subframes before the t-th subframe to obtain a predicted value of the channel coefficient corresponding to the SRS of the t-th subframe, wherein the measurement information comprises a timing adjustment amount and a phase difference, then the network device performs channel estimation according to the SRS of the t-th subframe received from the terminal device to obtain an estimated value of the channel coefficient corresponding to the SRS of the t-th subframe, then the network device performs timing adjustment amount compensation and phase compensation according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe to obtain an estimated value of the channel coefficient corresponding to the SRS of the t-th subframe after first compensation, and finally performs timing adjustment amount compensation and phase compensation according to the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe after first compensation and the estimated value of the SRS corresponding to each SRS of the subframe before the t-th subframe And performing channel prediction on the estimated value of the channel coefficient after the second compensation to obtain the channel coefficient at the downlink signal transmission time after the SRS of the t-th sub-frame is received.
With the channel prediction method provided by the first aspect, since the measurement information corresponding to the SRS of each subframe is transmitted after the terminal device transmits each SRS, and is delayed, the network device performs channel prediction according to the estimated value of the channel coefficient corresponding to each SRS of the subframe before the tth subframe and the measurement information to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth subframe, then performs timing adjustment compensation and phase compensation according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain an estimated value of the channel coefficient corresponding to the SRS of the tth subframe after first compensation, and finally performs channel prediction according to the estimated value of the channel coefficient corresponding to the SRS of the tth subframe after first compensation and the estimated value of the channel coefficient corresponding to each SRS of the subframe before the tth subframe after second compensation, and obtaining a channel coefficient of a downlink signal transmission time after receiving the SRS of the t sub-frame. Since the network device can obtain the accurate measurement information corresponding to the SRS of the historical sub-frame from the terminal device, the measurement information corresponding to the SRS of the historical sub-frame, that is, the timing adjustment amount and the phase difference of the SRS of each sub-frame with respect to the SRS of the previous sub-frame, so that the measurement information corresponding to the SRS of the historical sub-frame is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the historical sub-frame, obtains the predicted value of the channel coefficient corresponding to the SRS of the current (t-th) sub-frame, which can ensure the accuracy, and performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current sub-frame by using the predicted value of the channel coefficient corresponding to the SRS of the current sub-frame, which is equivalent to separate the change of the channel itself with time when estimating the timing adjustment amount and the phase difference, and can reduce the influence caused by the delay of the measurement information, therefore, the accuracy of timing adjustment quantity compensation and phase compensation can be improved, and the performance of channel prediction is ensured.
In one possible design, the method of this embodiment may further include: the network equipment receives measurement information corresponding to the SRS of the t subframe, performs timing adjustment quantity compensation and phase compensation on an estimated value of a channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and measurement information corresponding to each SRS of a subframe before the t subframe to obtain an estimated value of a channel coefficient after second compensation corresponding to the SRS of the t subframe, and continues to perform channel prediction according to the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after second compensation corresponding to each SRS of the subframe before the t subframe to obtain a channel coefficient at the downlink signal transmission time after the measurement information corresponding to the SRS of the t subframe is received.
With the channel prediction method provided by this embodiment, when the network device receives the measurement information corresponding to the SRS in the t-th subframe, directly performing timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS in the tth sub-frame according to the measurement information corresponding to the SRS in the tth sub-frame and the measurement information corresponding to each SRS in the sub-frame before the tth sub-frame, because the measurement information corresponding to the SRS of the tth sub-frame and the measurement information corresponding to each SRS of the sub-frame before the tth sub-frame are measured by the terminal device and are accurate, the network device performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth sub-frame according to the accurate measurement information corresponding to the SRS of the tth sub-frame and the measurement information corresponding to each SRS of the sub-frame before the tth sub-frame, the accuracy of timing adjustment quantity compensation and phase compensation can be ensured, and the performance of channel prediction is further ensured. Since the measurement information corresponding to the SRS of each subframe is transmitted after the SRS and is delayed, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, so that the accuracy of the timing adjustment compensation and the phase compensation can be improved. Therefore, the influence caused by the delay of the measurement information can be reduced, and the performance of channel prediction is further ensured.
In a possible design, the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the tth subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, which may specifically be:
the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, stores the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, performs channel prediction according to N of the estimated values of the channel coefficient after second compensation corresponding to the SRS of the subframe before the t-1 th subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t-1 th subframe, wherein N is a preset positive integer, and the estimated values of the channel coefficient after second compensation corresponding to the SRS of the N subframes comprise the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe.
By setting the estimated values of the channel coefficients after the second compensation corresponding to the SRSs of the N subframes to be N closest to the t subframe, the channel prediction method provided by this embodiment can reduce the complexity of S for channel prediction and ensure the performance of channel prediction.
In a possible design, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, which may be:
the network equipment carries out timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount, so as to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the subframes before the t-1 th subframe;
and the network equipment performs phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated phase difference is the sum of phase differences corresponding to the SRS of the subframes before the t-1 th subframe.
In one possible design, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe, and the method may be:
the network equipment firstly determines the estimated values of the timing adjustment amount of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame, then carries out timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame according to the estimated values of the timing adjustment amount of the t sub-frame and the t-1 sub-frame to obtain the estimated value of the channel coefficient after timing adjustment amount compensation, then determines the estimated value of the phase difference of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient after timing adjustment amount compensation corresponding to the SRS of the t sub-frame, and finally carries out SRS phase compensation on the estimated value of the channel coefficient after timing adjustment amount compensation corresponding to the t sub-frame according to the estimated value of the phase difference of the t sub-frame and the t-1 sub-frame, and obtaining an estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t sub-frame.
In one possible design, the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-1 th subframe according to the historical accumulated timing adjustment to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-1 th subframe, which may be:
the network device calculates a history from a timing adjustment amount Δ τ (n), n being 1,2, …, t-1 corresponding to an SRS of a subframe preceding the tth subframeAccumulated timing adjustment
Figure BDA0002467382650000031
Network equipment according to
Figure BDA0002467382650000032
The estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame is obtained by performing the timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame according to the following formula
Figure BDA0002467382650000041
Figure BDA0002467382650000042
K is the total subcarrier number of the SRS;
wherein Hk(t-1) is an estimated value of the channel coefficient corresponding to the SRS in the t-1 th sub-frame.
In one possible design, the network device performs phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, which may be:
the network equipment according to the phase difference corresponding to the SRS of the sub-frame before the tth sub-frame
Figure BDA0002467382650000043
Calculating historical accumulated phase difference
Figure BDA0002467382650000044
Network equipment according to
Figure BDA0002467382650000045
Estimate value of channel coefficient after timing adjustment amount compensation for SRS corresponding to t-1 th sub-frame by the following formula
Figure BDA0002467382650000046
Performing phase compensation to obtain the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th sub-frame
Figure BDA0002467382650000047
Figure BDA0002467382650000048
In a possible design, the network device performs channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the tth subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, and may be:
the network equipment estimates the channel coefficient after the second compensation according to the SRS corresponding to the sub-frame before the tth sub-frame
Figure BDA0002467382650000049
N of the t-th sub-frame, N is 1,2, …, t-1, K is 0,1, …, K-1, and a predicted value of a channel coefficient corresponding to the SRS of the t-th sub-frame is obtained
Figure BDA00024673826500000410
In a possible design, the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the estimated values of the timing adjustment of the t-th subframe and the t-1-th subframe to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-th subframe, which may be:
the network equipment estimates the timing adjustment quantity according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500000411
An estimated value H of a channel coefficient corresponding to SRS in the t-th subframe by the following formulak(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure BDA00024673826500000412
Figure BDA00024673826500000413
The network device performs phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-th subframe according to the estimated value of the phase difference between the t-th subframe and the t-1-th subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe, and the phase compensation may be:
the network equipment estimates the phase difference according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500000414
By the following formula pair
Figure BDA00024673826500000415
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500000416
Figure BDA00024673826500000417
In one possible design, the network device determines, according to the predicted value of the channel coefficient corresponding to the SRS in the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe, the estimated values of the timing adjustment amounts of the t-th subframe and the t-1-th subframe, which may be:
the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500000418
Estimated value H of channel coefficient corresponding to SRS in t-th subframek(t) is determined by the following formula
Figure BDA00024673826500000419
Figure BDA00024673826500000420
Wherein (·)*Representing a complex conjugate.
In one possible design, the network device determines, according to the predicted value of the channel coefficient corresponding to the SRS in the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS in the t-th subframe, an estimated value of a phase difference between the t-th subframe and the t-1-th subframe, where the estimated value may be:
the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500000421
And
Figure BDA0002467382650000051
is determined by the following formula
Figure BDA0002467382650000052
Figure BDA0002467382650000053
Where angle () represents the phase of the complex number.
In a second aspect, the present application provides a network device, comprising:
a receiving module, configured to receive, from a terminal device, measurement information corresponding to a sounding reference signal SRS of a t-1 th subframe, where the measurement information includes a timing adjustment amount and a phase difference, and t is greater than or equal to 2;
the channel prediction module is used for performing channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the sub-frame before the tth sub-frame to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame;
the receiving module is further configured to: receiving an SRS of a tth subframe from a terminal device;
the channel estimation module is used for carrying out channel estimation according to the SRS of the tth subframe to obtain an estimation value of a channel coefficient corresponding to the SRS of the tth subframe;
the processing module is used for performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe;
the channel prediction module is further configured to: and performing channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the SRS of the tth subframe is received.
In one possible design, the receiving module is further configured to: receiving measurement information corresponding to the SRS of the t subframe;
the processing module is further configured to: performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe;
the channel prediction module is further configured to: and continuing channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the measurement information corresponding to the SRS of the tth subframe is received.
In one possible design, the channel prediction module includes:
a compensation unit, configured to perform timing adjustment compensation and phase compensation on an estimated value of a channel coefficient corresponding to an SRS of a t-1 th subframe according to measurement information corresponding to the SRS of a subframe preceding the t-th subframe, obtain an estimated value of a channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, and store the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe;
and the channel prediction unit is used for performing channel prediction according to N estimated values of the channel coefficient after the second compensation corresponding to the SRS of the sub-frame before the tth sub-frame to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame, wherein N is a preset positive integer, and the estimated values of the channel coefficient after the second compensation corresponding to the SRS of the N sub-frames comprise the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame.
In one possible design, the compensation unit is specifically configured to:
performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the subframes before the t-1 th subframe;
and performing phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated phase difference is the sum of phase differences corresponding to the SRS of the subframes before the t-1 th subframe.
In one possible design, the processing module includes:
a first determining unit, configured to determine estimated values of timing adjustment amounts of a tth subframe and a t-1 th subframe according to a predicted value of a channel coefficient corresponding to an SRS of the tth subframe and an estimated value of a channel coefficient corresponding to the SRS of the tth subframe;
a first compensation unit, configured to perform timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the estimated values of the timing adjustment of the t-th subframe and the t-1-th subframe, to obtain an estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-th subframe:
a second determining unit, which determines the estimated value of the phase difference between the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame;
and the second compensation unit is used for carrying out phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.
In one possible design, the compensation unit is specifically configured to:
the historical accumulated timing adjustment amount is calculated from the timing adjustment amount Δ τ (n) corresponding to the SRS of the subframe preceding the tth subframe, where n is 1,2, …, and t-1
Figure BDA0002467382650000061
According to
Figure BDA0002467382650000062
The estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame is obtained by performing the timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame according to the following formula
Figure BDA0002467382650000063
Figure BDA0002467382650000064
K is the total subcarrier number of the SRS;
wherein Hk(t-1) is an estimated value of the channel coefficient corresponding to the SRS in the t-1 th sub-frame.
In one possible design, the compensation unit is specifically configured to:
according to the phase difference corresponding to SRS of sub-frame before the t sub-frame
Figure BDA0002467382650000065
Calculating historical accumulated phase difference
Figure BDA0002467382650000066
According to
Figure BDA0002467382650000067
Estimate value of channel coefficient after timing adjustment amount compensation for SRS corresponding to t-1 th sub-frame by the following formula
Figure BDA0002467382650000068
Performing phase compensation to obtain the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th sub-frame
Figure BDA0002467382650000069
Figure BDA00024673826500000610
In one possible design, the channel prediction unit is specifically configured to:
estimating the value of the channel coefficient after the second compensation corresponding to the SRS of the sub-frame before the t sub-frame
Figure BDA00024673826500000611
N of the t-th sub-frame, N is 1,2, …, t-1, K is 0,1, …, K-1, and a predicted value of a channel coefficient corresponding to the SRS of the t-th sub-frame is obtained
Figure BDA00024673826500000612
In one possible design, the first compensation unit is specifically configured to:
estimating the timing adjustment amount according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500000613
An estimated value H of a channel coefficient corresponding to SRS in the t-th subframe by the following formulak(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure BDA00024673826500000614
Figure BDA00024673826500000615
The second compensation unit is specifically configured to:
estimating value according to phase difference between t-th sub-frame and t-1-th sub-frame
Figure BDA00024673826500000616
By the following formula pair
Figure BDA00024673826500000617
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500000618
Figure BDA00024673826500000619
In one possible design, the first determination unit is specifically configured to:
predicting value of channel coefficient corresponding to SRS of t-th sub-frame
Figure BDA00024673826500000620
Estimated value H of channel coefficient corresponding to SRS in t-th subframek(t) is determined by the following formula
Figure BDA00024673826500000621
Figure BDA00024673826500000622
Wherein (·)*Representing a complex conjugate.
In one possible design, the second determination unit is specifically configured to:
predicting value of channel coefficient corresponding to SRS of t-th sub-frame
Figure BDA0002467382650000071
And
Figure BDA0002467382650000072
is determined by the following formula
Figure BDA0002467382650000073
Figure BDA0002467382650000074
Where angle () represents the phase of the complex number.
The beneficial effects of the network device provided in the second aspect and in each possible design of the second aspect may refer to the beneficial effects brought by each possible implementation manner of the first aspect, and are not described herein again.
In a third aspect, the present application provides a network device, comprising: a memory and a processor;
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the channel prediction method of the first aspect and any one of the possible designs of the first aspect via execution of executable instructions.
In a fourth aspect, the present application provides a readable storage medium, where an execution instruction is stored, and when the execution instruction is executed by at least one processor of a network device, the network device executes the channel prediction method in any one of the possible designs of the first aspect and the first aspect.
In a fifth aspect, the present application provides a chip, where the chip is connected to a memory, or where the chip is integrated with a memory, and when a software program stored in the memory is executed, the method for channel prediction in any one of the possible designs of the first aspect and the first aspect is implemented.
Drawings
Fig. 1 is a schematic diagram of a wireless communication system architecture for application of the present application;
FIG. 2 is a block diagram of a wireless communication system architecture in which the present application may be applied;
fig. 3 is a schematic communication process diagram of the channel prediction method provided in the present application;
fig. 4 is a flowchart of an embodiment of a channel prediction method provided in the present application;
FIG. 5 is a diagram illustrating timing adjustments for SRS in the t-1 th sub-frame of SRS in the t-2 th sub-frame;
FIG. 6 is a diagram illustrating channel coefficients corresponding to SRS;
fig. 7 is a flowchart of an embodiment of a channel prediction method provided in the present application;
fig. 8 is a flowchart of an embodiment of a channel prediction method provided in the present application;
fig. 9 is an interaction flowchart of an embodiment of a channel prediction method provided in the present application;
fig. 10 is a schematic structural diagram of an embodiment of a network device provided in the present application;
fig. 11 is a schematic structural diagram of an embodiment of a network device provided in the present application;
fig. 12 is a schematic structural diagram of an embodiment of a network device provided in the present application;
fig. 13 is a schematic structural diagram of a network device according to the present application.
Detailed Description
In this application, the terms "exemplary" or "such as" are used to indicate that any embodiment or aspect described as "exemplary" or "such as" in this application is not to be construed as preferred or advantageous over other embodiments or aspects. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In 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, meaning that there may be three relationships, e.g., a and/or B, which may mean: 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.
The embodiment of the present application can be applied to a wireless communication system, and it should be noted that the wireless communication system mentioned in the embodiment of the present application includes but is not limited to: narrowband Band-Internet of Things (NB-IoT), Global System for Mobile Communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (Code Division Multiple Access, CDMA2000), Time Division synchronous Code Division Multiple Access (Time Division-synchronous Code Division Multiple Access, TD-SCDMA), Long Term Evolution (Long Term Evolution, LTE), and three application scenarios Enhanced Mobile broadband (Enhanced Mobile broadband Band, enb), Ultra-high reliability and Low-Latency communication (Ultra-Low Latency Access, mtc) of 5G Mobile communication systems, and llc-mtc.
The communication device related to the present application mainly includes a network device or a terminal device. In the application, a sending end is a network device, and a receiving end is a terminal device; in the present application, the sending end is a terminal device, and the receiving end is a network device.
The terminal device of the embodiment of the application: may be a wireless terminal which may refer to a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A wireless Terminal may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), a remote Terminal (remote Terminal), an access Terminal (access Terminal), a user Terminal (user Terminal), a user agent (user agent), a user equipment (user device user equipment), without limitation.
Various embodiments are described herein in connection with a network device. The network device may be a device for communicating with the terminal device, and for example, may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a base station (nodeB, NB) in a WCDMA system, an evolved node b (eNB or eNodeB) in an LTE system, a next generation base station (next generation eNodeB, ng-eNB) in an LTE system, or a relay station, an Access Point (AP), a vehicle-mounted device, a wearable device, a network-side device in a 5G network or a network device in a future evolved Public Land Mobile Network (PLMN), and the like, and for example, may be a new generation base station (serving nodeB, gNB or gnnodeb).
Fig. 1 is a schematic diagram of a wireless communication system architecture applied in the present application, and as shown in fig. 1, the wireless communication system of the present application includes a network device and a terminal device, the terminal device sends an SRS to the network device, the network device performs channel estimation according to the SRS to obtain an estimated value of a channel coefficient based on the SRS, and the network device can apply the estimated value of the channel coefficient based on the SRS to downlink precoding according to reciprocity of uplink and downlink channels to avoid interference between users and thereby implement space division multiplexing, since the terminal device moves or the communication environment changes, the channel outdating problem occurs, and in order to reduce the loss caused by channel outdating, the network device can perform channel prediction according to the estimated value of the channel coefficient at the current time and the estimated value of the channel coefficient at the historical time, and predict the channel coefficient at the downlink signal transmission time after receiving the SRS of the current subframe. Since the SRS transmitted by the terminal device may be affected by random information unknown to the base station, for example, the random information includes a random phase and a random timing adjustment amount caused by the terminal device automatically adjusting the SRS transmission timing, and an estimated value of a channel coefficient is correspondingly affected by the random information, which results in performance degradation of channel prediction, so that the performance of channel prediction can be ensured by reducing the influence of the random phase and the random timing adjustment amount. In order to reduce the influence of the random phase and the random timing adjustment, after performing channel estimation according to the received SRS of the current subframe, timing adjustment compensation and phase compensation may be performed on an estimated value of a channel coefficient of the SRS of the current subframe, and then channel prediction may be performed using the estimated value of the channel coefficient after the timing adjustment compensation and the phase compensation to obtain a channel coefficient at a downlink signal transmission time after the SRS of the current subframe is received.
In the prior art, a method for reducing the influence of random phase and random timing adjustment amount is to perform timing adjustment amount compensation on an estimated value of a channel coefficient corresponding to a SRS of a current subframe according to estimated values of timing adjustment amounts of the SRS of the current subframe and the SRS of a previous subframe to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the current subframe, and then perform phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the current subframe according to an estimated value of a phase difference between the SRS of the current subframe and the SRS of the previous subframe to obtain estimated values of the channel coefficient after the timing adjustment amount compensation and the phase compensation corresponding to the SRS of the current subframe, where a channel in a real environment changes with time and the channel is interfered by noise, and interference factors of the estimated value of the timing adjustment amount and the estimated value of the phase difference also include channel change and noise, the timing adjustment amount compensation and the phase compensation are performed by using the estimated value of the timing adjustment amount and the estimated value of the phase difference, which are subjected to channel variation and noise interference, and the accuracy is not high, so that the performance of channel prediction is poor. To solve the problem, the present application provides a channel prediction method and apparatus, fig. 2 is a schematic diagram of a wireless communication system architecture applicable to the present application, fig. 3 is a schematic diagram of a communication process of the channel prediction method provided by the present application, and as shown in fig. 2 and fig. 3, after each SRS transmission (that is, SRS transmission in each subframe) is performed by a terminal device, a phase difference between the SRS transmitted in a current subframe and the SRS transmitted in a previous subframe is measured, a timing adjustment amount of the SRS in the current subframe relative to the SRS in the previous subframe is known by the terminal device, then the terminal device transmits measurement information corresponding to the SRS in the current subframe (including the timing adjustment amount and the phase difference of the SRS in the current subframe relative to the SRS in the previous subframe), and after performing channel estimation on the SRS in the current subframe by the network device, channel prediction is performed according to the measurement information corresponding to the SRS in a history subframe and an estimated value of a channel coefficient corresponding to the SRS in the history subframe to obtain a channel system corresponding to the SRS in the current subframe The method includes the steps of obtaining a number of predicted values, wherein the measurement information corresponding to the SRS of the historical subframe is the measurement information corresponding to the SRS of the previous subframe and the measurement information corresponding to the SRS of the subframe before the previous subframe, then performing timing adjustment compensation and phase compensation on an estimated value of a channel coefficient corresponding to the SRS of the current subframe according to the predicted value of the channel coefficient corresponding to the SRS of the current subframe to obtain an estimated value of a channel coefficient corresponding to the SRS of the current subframe after first compensation, and performing channel prediction by the network equipment according to the estimated value of the channel coefficient corresponding to the SRS of the current subframe after first compensation and the estimated value of the channel coefficient corresponding to each SRS of the subframe before the current subframe after second compensation to obtain a channel coefficient at a downlink signal transmission time after the SRS of the current subframe is received. After receiving the measurement information corresponding to the SRS of the current subframe, the network device may perform timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the measurement information corresponding to the SRS of the current subframe and the measurement information corresponding to the SRS of a subframe before the current subframe to obtain an estimated value of the channel coefficient after second compensation corresponding to the SRS of the current subframe, and perform channel prediction according to the estimated value of the channel coefficient after second compensation corresponding to the SRS of the current subframe and the estimated value of the channel coefficient after second compensation corresponding to each SRS of a subframe before the current subframe to obtain a channel coefficient at a downlink signal transmission time after receiving the measurement information corresponding to the SRS of the current subframe.
Since the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured after the terminal device transmits each SRS, and the transmission of the measurement information corresponding to the SRS of each subframe is delayed, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the predicted value of the channel coefficient corresponding to the SRS of the current subframe before the network device does not receive the measurement information corresponding to the SRS of the current subframe. In the process of obtaining the predicted value of the channel coefficient corresponding to the SRS of the current subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, and the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the current subframe, the measurement information corresponding to the SRS of the subframe before the current subframe is measurement information corresponding to the SRS of the historical subframe, and the measurement information corresponding to the SRS of the historical subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical subframe and the estimated value of the channel coefficient corresponding to the SRS of the historical subframe, obtains the predicted value of the channel coefficient corresponding to the SRS of the current subframe, and then performs timing adjustment amount on the estimated value of the channel coefficient corresponding to the SRS of the current subframe by using the predicted value of the channel coefficient corresponding to the current subframe The compensation and the phase compensation are equivalent to the separation of the change of the channel along with the time when the timing adjustment quantity and the phase difference are estimated, and the influence caused by the delay of the measurement information can be reduced, so that the accuracy of the timing adjustment quantity compensation and the phase compensation can be improved, and the performance of channel prediction can be ensured. The following describes the channel prediction method and apparatus provided in the present application in detail with reference to the accompanying drawings.
Fig. 4 is a flowchart of an embodiment of a channel prediction method provided in the present application, and as shown in fig. 4, an execution subject of the embodiment may be a network device, and the method of the embodiment may include:
s101, after receiving measurement information corresponding to the SRS of the t-1 th sub-frame from the terminal equipment, the network equipment performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the sub-frames before the t-th sub-frame to obtain the predicted value of the channel coefficient corresponding to the SRS of the t-th sub-frame, wherein the measurement information comprises a timing adjustment amount and a phase difference, and t is greater than or equal to 2.
Wherein, for the measurement information corresponding to the SRS in the t-1 th sub-frame, the timing adjustment amount is the value obtained by subtracting the SRS transmission timing in the t-1 th sub-frame from the SRS transmission timing in the t-2 th sub-frame, and the phase difference is the value obtained by subtracting the SRS phase in the t-2 th sub-frame from the SRS phase in the t-1 th sub-frame.
Specifically, the SRS is periodically transmitted by the terminal device to the network device, where the transmission period is, for example, N subframes, it should be noted that, for example, the transmission time of the SRS in the T-th subframe is T, the transmission time of the SRS in the T + 1-th subframe is T + N, the terminal device measures the phase difference between the SRS transmitted in the current subframe and the SRS transmitted in the previous subframe after each SRS transmission (i.e., SRS transmission in each subframe), the timing adjustment amount of the SRS in the current subframe and the SRS in the previous subframe is known to the terminal device, and then the terminal device transmits measurement information corresponding to the SRS in the current subframe (including the timing adjustment amount and the phase difference of the SRS in the current subframe relative to the SRS in the previous subframe) to the network device. In this embodiment, the process of processing the SRS of each received subframe by the network device is described by using the tth subframe as the current subframe, and before receiving the SRS of the tth subframe, measurement information corresponding to the SRS of the t-1 th subframe sent by the terminal device is received. The timing adjustment amount is a value obtained by subtracting the SRS transmission timing of the T-th subframe from the SRS transmission timing of the T-th subframe every time the terminal device transmits the SRS, it is understood that the timing adjustment amount may be a positive number or a negative number, fig. 5 is a schematic diagram of the timing adjustment amount of the SRS of the T-2 th subframe relative to the SRS of the T-1 th subframe, as shown in fig. 5, an upper curve in fig. 5 shows the SRS of the T-2 th subframe, a lower curve in fig. 5 shows the SRS of the T-1 th subframe, and the timing adjustment amount corresponding to the SRS of the T-1 th subframe is a value obtained by subtracting the SRS transmission timing of the T-1 th subframe from the SRS transmission timing of the SRS of the T-2 th subframe, that is Δ T in fig. 5. Fig. 6 is a diagram illustrating the corresponding channel coefficients of SRS, as shown in fig. 6, where S in fig. 6 is SRS for each subframe,
Figure BDA0002467382650000101
channel coefficients corresponding to the SRS of the t-th subframe,
Figure BDA0002467382650000102
channel coefficients corresponding to the SRS of the t-1 th subframe,
Figure BDA0002467382650000103
channel coefficients corresponding to SRS of the t-2 th sub-frame, wherein
Figure BDA0002467382650000104
Figure BDA0002467382650000105
And
Figure BDA0002467382650000106
is a random phase (also called a random phase sequence), the phase difference corresponding to the SRS in the t-1 th sub-frame is the phase of the SRS in the t-1 th sub-frame
Figure BDA0002467382650000107
Subtracting the phase difference of the SRS of the t-2 th subframe
Figure BDA0002467382650000108
The value of (c).
Wherein, the estimation value of the channel coefficient corresponding to the SRS of the subframe before the tth subframe is: an estimated value of a channel coefficient corresponding to the SRS in the t-1 th subframe, an estimated value of a channel coefficient corresponding to the SRS in the t-2 th subframe, an estimated value of a channel coefficient corresponding to the SRS in the … … 2 nd subframe, and an estimated value of a channel coefficient corresponding to the SRS in the 1 st subframe; the measurement information corresponding to the SRS of the subframe before the tth subframe is: the measurement information corresponding to the SRS in the t-1 th subframe, the measurement information corresponding to the SRS in the t-2 th subframe, the measurement information corresponding to the SRS in the … … 2 nd subframe, and the measurement information corresponding to the SRS in the 1 st subframe are also referred to as the measurement information corresponding to the SRS in the history subframe.
As an implementation manner, the network device performs channel prediction according to the estimated value of the channel coefficient and the measurement information corresponding to the SRS of the subframe before the t-th subframe, which may specifically be:
s1011, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and stores the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe.
It should be noted that the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe is the estimated value of the channel coefficient after the second timing adjustment amount compensation and the phase compensation corresponding to the SRS of the t-1 th subframe, for the t-1 th subframe, the estimated value of the channel coefficient after the second timing adjustment amount compensation and the phase compensation is obtained by performing the timing adjustment amount compensation and the phase compensation according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, and the estimated value of the channel coefficient after the first timing adjustment amount compensation and the phase compensation is obtained by performing the timing adjustment amount compensation and the phase compensation according to the predicted value of the channel coefficient corresponding to the SRS of the t-1 th subframe.
Specifically, the network device performs timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRSs of the subframes before the t-1 th subframe.
And then the network equipment performs phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the subframes before the t-1 th subframe. And after the network equipment obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th sub-frame through S1031, the network equipment stores the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th sub-frame.
S1012, the network device performs channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the sub-frame before the tth sub-frame to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame, wherein N is a preset positive integer, and the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N sub-frames include the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame.
It should be noted that, the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the subframe before the t-1 th subframe is obtained by the network device by compensating according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe and storing, for example, the currently received SRS of the 3 rd subframe, the network device obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the 2 nd subframe via S1011, and stores the estimated value of the second compensated channel coefficient corresponding to the SRS of the 2 nd subframe, then, channel prediction is carried out according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the 2 nd sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the 1 st sub-frame to obtain the predicted value of the channel coefficient corresponding to the SRS of the 3 rd sub-frame, wherein the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the 1 st subframe is already stored by the network device.
Specifically, for each sub-frame before the tth sub-frame, i.e. the t-1 st sub-frame, the t-2 nd sub-frame, the … … nd sub-frame and the 1 st sub-frame, after the network device obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of each sub-frame according to S1011, storing the estimated value of the second compensated channel coefficient corresponding to the SRS of each subframe, after obtaining the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and performing channel prediction according to N of the stored estimated values of the second compensated channel coefficients corresponding to the SRS of the sub-frame before the t sub-frame, wherein the estimated values of the second compensated channel coefficients corresponding to the SRS of the N sub-frames comprise the estimated values of the second compensated channel coefficients corresponding to the SRS of the t-1 sub-frame, and the channel prediction can be performed by using a channel prediction algorithm. Where N is a preset positive integer, for example, N is 20, and optionally, the estimated values of the channel coefficients after the second compensation corresponding to the SRSs in the N subframes are N nearest to the t subframe, that is, the t-1 th subframe, the t-2 th subframe, the … … t-19 th subframe, and the t-20 th subframe. By setting the estimated values of the channel coefficients after the second compensation corresponding to the SRSs of the N subframes to be N closest to the t subframe, on one hand, the complexity of channel prediction in S1012 can be reduced, and on the other hand, the performance of channel prediction can be ensured. It is to be understood that N may be all of the estimated values of the second compensated channel coefficients corresponding to the SRS in the subframe before the tth subframe.
Further, the network device may store only the estimated values of the second compensated channel coefficients corresponding to the SRSs of the N subframes closest to the t subframe, and the storage before the t-N subframe is not required, so that the required storage capacity may be reduced.
S102, the network equipment carries out channel estimation according to the SRS of the t sub-frame received from the terminal equipment to obtain an estimated value of a channel coefficient corresponding to the SRS of the t sub-frame.
Specifically, after receiving the SRS in the t-th subframe, the network device performs channel estimation on the SRS in the t-th subframe to obtain an estimated value of a channel coefficient corresponding to the SRS in the t-th subframe.
S103, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe.
It should be noted that the estimated value of the channel coefficient after the first compensation corresponding to the SRS in the t-th subframe is the estimated value of the channel coefficient after the first timing adjustment amount compensation and the phase compensation corresponding to the SRS in the t-th subframe.
Specifically, since the phase difference between the SRS in each subframe and the SRS in the previous subframe is measured by the terminal device after each SRS is transmitted, and is delayed, before the terminal device does not receive the measurement information corresponding to the SRS in the current subframe, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS in the current subframe according to the predicted value of the channel coefficient corresponding to the SRS in the current subframe, as an implementable manner, S103 may include:
and S1031, the network equipment determines the estimated values of the timing adjustment quantity of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame.
S1032, the network equipment performs timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame according to the estimated values of the timing adjustment amounts of the t sub-frame and the t-1 sub-frame to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame.
S1033, the network device determines an estimated value of the phase difference between the t-th sub-frame and the t-1 th sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t-th sub-frame and the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-th sub-frame.
S1034, the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame according to the estimated value of the phase difference between the t sub-frame and the t-1 sub-frame to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t sub-frame.
S104, the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the sub-frames before the t-th sub-frame, and obtains the channel coefficient at the downlink signal sending time after the SRS of the t-th sub-frame is received.
Specifically, the network device may perform channel prediction according to N preset estimated values of the first compensated channel coefficients corresponding to the SRS in the t-th subframe and the second compensated channel coefficients corresponding to the SRSs in the subframes before the t-th subframe, where the estimated values of the second compensated channel coefficients corresponding to the SRSs in the N subframes are N closest to the t-th subframe, and it is understood that N may be all of the estimated values of the second compensated channel coefficients corresponding to the SRSs in the subframes before the t-th subframe.
In the channel prediction method provided in this embodiment, after receiving, by a network device, measurement information corresponding to an SRS in a t-1 th subframe from a terminal device, a channel prediction is performed according to an estimated value of a channel coefficient corresponding to the SRS in a subframe before the t-th subframe and the measurement information, so as to obtain a predicted value of the channel coefficient corresponding to the SRS in the t-th subframe, where the measurement information includes a timing adjustment amount and a phase difference, and then, a channel estimation is performed according to the SRS in the t-th subframe received from the terminal device, so as to obtain an estimated value of the channel coefficient corresponding to the SRS in the t-th subframe, and since transmission of the measurement information corresponding to the SRS in each subframe is delayed, the network device performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the predicted value of the SRS in the t-th subframe before receiving the measurement information corresponding to the SRS in the t-th subframe, and then, channel prediction is carried out according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the sub-frames before the t sub-frame, so as to obtain the channel coefficient at the downlink signal transmission time after the SRS of the t sub-frame is received. In the process of obtaining the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, and the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the tth subframe, the measurement information corresponding to the SRS of the subframe before the tth subframe is measurement information corresponding to the SRS of the historical subframe, and the measurement information corresponding to the SRS of the historical subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical subframe and the estimated value of the channel coefficient corresponding to the SRS of the historical subframe, obtains the predicted value of the channel coefficient corresponding to the SRS of the current (tth) subframe, and performs channel prediction on the estimated value of the channel coefficient corresponding to the SRS of the current subframe by using the predicted value of the channel coefficient corresponding to the current subframe The time adjustment amount compensation and the phase compensation are equivalent to the separation of the change of a channel along with time when the timing adjustment amount and the phase difference are estimated, and the influence caused by the delay of measurement information can be reduced, so that the accuracy of the timing adjustment amount compensation and the phase compensation can be improved, and the performance of channel prediction can be ensured.
Fig. 7 is a flowchart of an embodiment of a channel prediction method provided in the present application, where an execution subject of the embodiment may be a network device, and the method of the embodiment may further include, on the basis of the embodiment shown in fig. 4:
s105, the network equipment receives the measurement information corresponding to the SRS of the t subframe.
S106, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe according to the measurement information corresponding to the SRS of the t-th subframe and the measurement information corresponding to the SRS of the subframe before the t-th subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-th subframe.
S107, the network equipment continues to perform channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-th sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the sub-frame before the t-th sub-frame, and obtains the channel coefficient at the downlink signal sending time after the measurement information corresponding to the SRS of the t-th sub-frame is received.
After receiving the measurement information corresponding to the SRS of the tth subframe, the network device directly performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe, because the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe are measured by the terminal device and are accurate, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the accurate measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe, which can ensure the accuracy of the timing adjustment compensation and the phase compensation, and further ensure the performance of channel prediction. Since the measurement information corresponding to the SRS of each subframe is transmitted after the SRS and is delayed, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe before the measurement information corresponding to the SRS of the t-th subframe is not received, so that the accuracy of the timing adjustment compensation and the phase compensation can be improved. Therefore, the influence caused by the delay of the measurement information can be reduced, and the performance of channel prediction is further ensured.
Fig. 8 is a flowchart of an embodiment of a channel prediction method provided in the present application, where an execution subject of the embodiment may be a network device, and the method of the present embodiment is based on the embodiment shown in fig. 8, and the present embodiment describes in detail an implementable manner of S103 and S104 in combination with fig. 8, as shown in fig. 8, the method of the present embodiment may include:
S201-S202 are the same as S101 and S102, and refer to S101-S102 in detail, which are not described herein again.
S203, the network device calculates the historical accumulated timing adjustment amount according to the timing adjustment amount Δ τ (n) corresponding to the SRS of the sub-frame before the tth sub-frame, where n is 1,2, …, and t-1
Figure BDA0002467382650000131
S204, the network equipment accumulates the timing adjustment quantity according to the history
Figure BDA0002467382650000132
Performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe
Figure BDA0002467382650000141
Specifically, the formula is as follows
Figure BDA0002467382650000142
Figure BDA0002467382650000143
K is the total subcarrier number of SRS, where Hk(t-1) is an estimated value of the channel coefficient corresponding to the SRS in the t-1 th sub-frame.
Through S204 according to
Figure BDA0002467382650000144
The timing adjustment amount compensation is performed on the estimated value of the channel coefficient corresponding to the SRS in the t-1 th subframe, so that the timing of SRS transmission in the t-1 th subframe can be the same as the timing of SRS transmission in the 0 th subframe, and it can be understood that the timing adjustment amounts of SRS in the subframes before the t-1 th subframe are all compensated.
S205, the network device responds to the phase difference corresponding to the SRS of the sub-frame before the tth sub-frame
Figure BDA0002467382650000145
Calculating historical accumulated phase difference
Figure BDA0002467382650000146
S206, network equipment according to
Figure BDA0002467382650000147
Estimated value of channel coefficient compensated for timing adjustment amount corresponding to SRS in t-1 th subframe
Figure BDA0002467382650000148
Performing phase compensation to obtain the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th sub-frame
Figure BDA0002467382650000149
Specifically, the formula is as follows
Figure BDA00024673826500001410
Figure BDA00024673826500001411
Through S206 according to
Figure BDA00024673826500001412
Estimated value of channel coefficient compensated for timing adjustment amount corresponding to SRS in t-1 th subframe
Figure BDA00024673826500001413
The phase compensation is performed so that the phase of the SRS in the t-1 th subframe is the same as the phase of the SRS in the 0 th subframe, and it can be understood that the phase of the SRS in the subframes before the t-1 th subframe is completely compensated.
S207, the network device estimates the second compensated channel coefficient according to the SRS corresponding to the sub-frame before the tth sub-frame
Figure BDA00024673826500001414
N of the t-th sub-frame, N is 1,2, …, t-1, K is 0,1, …, K-1, and a predicted value of a channel coefficient corresponding to the SRS of the t-th sub-frame is obtained
Figure BDA00024673826500001415
Wherein N is a preset positive integer.
S208, the network equipment determines the estimated values of the timing adjustment quantity of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001416
As a practical way, S208 may be: the network equipment performs prediction according to the channel coefficient corresponding to the SRS of the t sub-frameMeasured value
Figure BDA00024673826500001417
Estimated value H of channel coefficient corresponding to SRS in t-th subframek(t) is determined by the following formula
Figure BDA00024673826500001418
Figure BDA00024673826500001419
Wherein (·)*Representing a complex conjugate.
It should be noted that, in the following description,
Figure BDA00024673826500001420
and may also be obtained by other calculation methods, which is not limited in this embodiment.
S209, the network equipment estimates the timing adjustment quantity according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500001421
Estimated value H of channel coefficient corresponding to SRS in t-th subframek(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure BDA00024673826500001422
Specifically, the formula is as follows
Figure BDA00024673826500001423
Figure BDA00024673826500001424
S210, the network equipment determines an estimated value of the phase difference between the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001425
As a practical way, S209 may be: the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001426
And
Figure BDA00024673826500001427
is determined by the following formula
Figure BDA00024673826500001428
Figure BDA00024673826500001429
Where angle () represents the phase of the complex number.
It should be noted that, in the following description,
Figure BDA00024673826500001430
and may also be obtained by other calculation methods, which is not limited in this embodiment.
S211, the network equipment estimates the phase difference according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500001431
To pair
Figure BDA00024673826500001432
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001433
Specifically, the formula is as follows
Figure BDA00024673826500001434
Figure BDA00024673826500001435
S212, the network device estimates the channel coefficient after the first compensation according to the SRS corresponding to the t sub-frame
Figure BDA00024673826500001436
And performing channel prediction on the estimated values of the channel coefficients after the second compensation corresponding to the SRSs in the sub-frame before the tth sub-frame to obtain the channel coefficients at the downlink signal transmission time after the SRS in the tth sub-frame is received.
Specifically, the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe is obtained in S211
Figure BDA0002467382650000151
Then, can be based on
Figure BDA0002467382650000152
And performing channel prediction on the estimated values of the channel coefficients after the second compensation corresponding to the SRSs in the sub-frame before the tth sub-frame, specifically, performing channel prediction by using a channel prediction algorithm.
In the channel prediction method provided in this embodiment, since the transmission of the measurement information corresponding to the SRS in each subframe is delayed, before the network device does not receive the measurement information corresponding to the SRS in the t-th subframe, performing timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe, thereby realizing the timing adjustment amount compensation and the phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe, and then, channel prediction is carried out according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the sub-frames before the t sub-frame, so as to obtain the channel coefficient at the downlink signal transmission time after the SRS of the t sub-frame is received. In the process of obtaining the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, and the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the tth subframe, the measurement information corresponding to the SRS of the subframe before the tth subframe is measurement information corresponding to the SRS of the historical subframe, and the measurement information corresponding to the SRS of the historical subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical subframe and the estimated value of the channel coefficient corresponding to the SRS of the historical subframe, obtains the predicted value of the channel coefficient corresponding to the SRS of the current (tth) subframe, and performs channel prediction on the estimated value of the channel coefficient corresponding to the SRS of the current subframe by using the predicted value of the channel coefficient corresponding to the current subframe The time adjustment amount compensation and the phase compensation are equivalent to the separation of the change of a channel along with time when the timing adjustment amount and the phase difference are estimated, and the influence caused by the delay of measurement information can be reduced, so that the accuracy of the timing adjustment amount compensation and the phase compensation can be improved, and the performance of channel prediction can be ensured.
The following describes the technical solutions of the embodiments of the methods shown in fig. 4, 7 and 8 in detail by using a specific embodiment.
Fig. 9 is an interaction flowchart of an embodiment of a channel prediction method provided in the present application, and as shown in fig. 9, the method of the present embodiment may include:
s301, the terminal equipment sends the SRS of the t-1 sub-frame to the network equipment.
S302, the terminal device measures the phase difference between the SRS of the t-1 th subframe and the SRS of the t-2 th subframe.
Specifically, the phase difference between the SRS in the t-1 th subframe and the SRS in the t-2 th subframe is the value obtained by subtracting the phase of the SRS in the t-1 th subframe from the phase of the SRS in the t-2 th subframe.
S303, the terminal equipment sends the measurement information corresponding to the SRS of the t-1 sub-frame to the network equipment, and the measurement information comprises a timing adjustment amount and a phase difference.
Wherein the timing adjustment amount is the value obtained by subtracting the SRS transmission timing of the t-1 th subframe from the SRS transmission timing of the t-2 th subframe, and the phase difference is the value obtained by subtracting the SRS phase of the t-2 th subframe from the SRS phase of the t-1 th subframe.
S304, the network equipment carries out channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to the SRS of the sub-frame before the tth sub-frame to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame.
The specific manner may adopt S203-S207 shown in fig. 7, which is not described herein again.
S305, the terminal equipment sends the SRS of the tth subframe to the network equipment.
S306, the network equipment carries out channel estimation on the SRS of the t sub-frame to obtain an estimated value of a channel coefficient corresponding to the SRS of the t sub-frame.
S307, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe.
The specific manner may adopt S208-S211 shown in fig. 8, which is not described herein again.
S308, the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the sub-frames before the t-th sub-frame, so as to obtain the channel coefficient at the downlink signal sending time after the SRS of the t-th sub-frame is received.
S309, the terminal device sends the measurement information corresponding to the SRS of the t sub-frame to the network device.
S310, after receiving the measurement information corresponding to the SRS of the t-th subframe, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe according to the measurement information corresponding to the SRS of the t-th subframe and the measurement information corresponding to the SRS of the subframe before the t-th subframe, and obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-th subframe.
As an implementation manner, S310 may specifically be:
s3101, network deviceCalculating a historical accumulated timing adjustment amount based on the timing adjustment amount corresponding to the SRS in the tth subframe and the timing adjustment amount corresponding to the SRS in the subframe before the tth subframe, wherein n is 1,2, …, t
Figure BDA0002467382650000161
S3102, the network device accumulates the timing adjustment amount according to the history
Figure BDA0002467382650000162
Performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure BDA0002467382650000163
Specifically, the formula is as follows
Figure BDA0002467382650000164
Figure BDA0002467382650000165
K is the total subcarrier number of SRS, where Hk(t) is an estimated value of a channel coefficient corresponding to the SRS in the t-th subframe.
According to S3102
Figure BDA0002467382650000166
The timing adjustment amount compensation is performed on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe, so that the timing of transmitting the SRS in the t-th subframe can be the same as the timing of transmitting the SRS in the 0-th subframe, and it can be understood that the timing adjustment amounts of the SRS in the subframes before the t-th subframe are all compensated, and the timing of transmitting the SRS in each subframe after the compensation can be the same as the timing of transmitting the SRS in the 0-th subframe because the SRS in the 1-th subframe has the timing adjustment amount and the phase difference with respect to the SRS in the 0-th subframe.
S3103, the network device according to the phase difference corresponding to the SRS of the t sub-frame and the phase difference corresponding to the SRS of the sub-frame before the t sub-frame
Figure BDA0002467382650000167
Calculating historical accumulated phase difference
Figure BDA0002467382650000168
S3102, the network device
Figure BDA0002467382650000169
Estimated value of channel coefficient after timing adjustment amount compensation for SRS corresponding to t-th subframe
Figure BDA00024673826500001610
Performing phase compensation to obtain the estimated value of the second compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001611
Specifically, the formula is as follows
Figure BDA00024673826500001612
Figure BDA00024673826500001613
According to S3102
Figure BDA00024673826500001614
Estimated value of channel coefficient after timing adjustment amount compensation for SRS corresponding to t-th subframe
Figure BDA00024673826500001615
The phase compensation may be performed such that the phase of the SRS in the tth subframe is the same as the phase of the SRS in the 0 th subframe, and it is understood that the phase of the SRS in the subframes before the tth subframe is completely compensated.
S311, the network device continues to perform channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS in the t-th sub-frame and the estimated value of the channel coefficient after the second compensation corresponding to each SRS in the sub-frame before the t-th sub-frame, and obtains the channel coefficient at the downlink signal sending time after receiving the measurement information corresponding to the SRS in the t-th sub-frame.
Fig. 10 is a schematic structural diagram of an embodiment of a network device provided in the present application, and as shown in fig. 10, the network device of the present embodiment may include: a receiving module 11, a channel prediction module 12, a channel estimation module 13 and a processing module 14, wherein,
the receiving module 11 is configured to receive, from a terminal device, measurement information corresponding to a sounding reference signal SRS of a t-1 th subframe, where the measurement information includes a timing adjustment amount and a phase difference, and t is greater than or equal to 2;
the channel prediction module 12 is configured to perform channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of a subframe before the tth subframe, to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth subframe;
the receiving module 11 is further configured to: receiving an SRS of a tth subframe from a terminal device;
the channel estimation module 12 is configured to perform channel estimation according to the SRS of the tth subframe to obtain an estimated value of a channel coefficient corresponding to the SRS of the tth subframe;
the channel estimation module is used for carrying out channel estimation according to the SRS of the tth subframe to obtain an estimation value of a channel coefficient corresponding to the SRS of the tth subframe;
the processing module 14 is configured to perform timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, so as to obtain an estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe;
the channel prediction module 12 is further configured to: and performing channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the SRS of the tth subframe is received.
Further, the receiving module 11 is further configured to:
receiving measurement information corresponding to the SRS of the t subframe;
the processing module 14 is further configured to: performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe;
the channel prediction module 12 is further configured to: and continuing channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the measurement information corresponding to the SRS of the tth subframe is received.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 4, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 11 is a schematic structural diagram of an embodiment of a network device provided in the present application, and as shown in fig. 11, in the network device of the present embodiment, on the basis shown in fig. 10, the channel prediction module 12 may include: a compensation unit 121 and a channel prediction unit 122, wherein,
the compensation unit 121 is configured to perform timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtain an estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and store the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe.
The channel prediction unit 122 is configured to perform channel prediction according to N of the estimated values of the second compensated channel coefficients corresponding to the SRS of the subframe before the t-th subframe, where N is a preset positive integer, and the estimated values of the second compensated channel coefficients corresponding to the SRS of the N subframes include the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 subframe.
Further, the compensation unit 121 is specifically configured to: and performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the subframes before the t-1 th subframe, performing phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the subframes before the t-1 th subframe.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 4, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 12 is a schematic structural diagram of an embodiment of a network device provided in the present application, and as shown in fig. 11, in the network device of the present embodiment, on the basis shown in fig. 10 or fig. 11, the processing module 14 may include: a first determining unit 141, a first compensating unit 142, a second determining unit 143, and a second compensating unit 144, wherein,
the first determining unit 141 is configured to determine estimated values of timing adjustment amounts of the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe;
the first compensation unit 142 is configured to perform timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the estimated values of the timing adjustment amounts in the t-th subframe and the t-1-th subframe, so as to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS in the t-th subframe:
the second determining unit 143 determines an estimated value of the phase difference between the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS of the t-th subframe;
the second compensation unit 144 is configured to perform phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-th subframe according to the estimated value of the phase difference between the t-th subframe and the t-1-th subframe, so as to obtain an estimated value of the channel coefficient after the first compensation corresponding to the SRS in the t-th subframe.
Further, the compensation unit 121 is specifically configured to:
the historical accumulated timing adjustment amount is calculated from the timing adjustment amount Δ τ (n) corresponding to the SRS of the subframe preceding the tth subframe, where n is 1,2, …, and t-1
Figure BDA0002467382650000181
According to
Figure BDA0002467382650000182
The estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame is obtained by performing the timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame according to the following formula
Figure BDA0002467382650000183
Figure BDA0002467382650000184
K is the total subcarrier number of the SRS;
wherein Hk(t-1) is an estimated value of the channel coefficient corresponding to the SRS in the t-1 th sub-frame.
Further, the compensation unit 121 is specifically configured to:
according to the phase difference corresponding to SRS of sub-frame before the t sub-frame
Figure BDA0002467382650000185
Calculating historical accumulated phase difference
Figure BDA0002467382650000186
According to
Figure BDA0002467382650000187
The timing adjustment amount corresponding to the SRS of the t-1 th sub-frame is compensated by the following formulaEstimation of track coefficients
Figure BDA0002467382650000188
Performing phase compensation to obtain the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th sub-frame
Figure BDA0002467382650000189
Figure BDA00024673826500001810
Further, the channel prediction unit 122 is specifically configured to:
estimating the value of the channel coefficient after the second compensation corresponding to the SRS of the sub-frame before the t sub-frame
Figure BDA00024673826500001811
N of the t-th sub-frame, N is 1,2, …, t-1, K is 0,1, …, K-1, and a predicted value of a channel coefficient corresponding to the SRS of the t-th sub-frame is obtained
Figure BDA00024673826500001812
Further, the first compensation unit 142 is specifically configured to:
estimating the timing adjustment amount according to the t sub-frame and the t-1 sub-frame
Figure BDA00024673826500001813
An estimated value H of a channel coefficient corresponding to SRS in the t-th subframe by the following formulak(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure BDA00024673826500001814
Figure BDA00024673826500001815
The second compensation unit 144 is specifically configured to:
estimating value according to phase difference between t-th sub-frame and t-1-th sub-frame
Figure BDA00024673826500001816
By the following formula pair
Figure BDA00024673826500001817
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure BDA00024673826500001818
Figure BDA00024673826500001819
Further, the first determining unit 141 is specifically configured to:
predicting value of channel coefficient corresponding to SRS of t-th sub-frame
Figure BDA00024673826500001820
Estimated value H of channel coefficient corresponding to SRS in t-th subframek(t) is determined by the following formula
Figure BDA00024673826500001821
Figure BDA0002467382650000191
Wherein (·)*Representing a complex conjugate.
Further, the second determining unit 143 is specifically configured to:
predicting value of channel coefficient corresponding to SRS of t-th sub-frame
Figure BDA0002467382650000192
And
Figure BDA0002467382650000193
by such asThe following formula determines
Figure BDA0002467382650000194
Figure BDA0002467382650000195
Where angle () represents the phase of the complex number.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 7, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 13 is a schematic structural diagram of a network device provided in the present application, where the network device 100 includes:
a memory 101 and a processor 102;
a memory 101 for storing a computer program;
a processor 102 for executing a computer program stored in a memory to implement the channel prediction method in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 101 may be separate or integrated with the processor 102.
When memory 101 is a separate device from processor 102, radio access network apparatus 100 may further include:
a bus 103 for connecting the memory 101 and the processor 102.
Optionally, this embodiment further includes: a communication interface 104, the communication interface 104 being connectable to the processor 102 via a bus 103. Processor 102 may control communication interface 103 to implement the above-described receiving and transmitting functions of network device 100.
The apparatus may be configured to perform each step and/or flow corresponding to the network device in the foregoing method embodiment.
The present application further provides a readable storage medium, in which an execution instruction is stored, and when the execution instruction is executed by at least one processor of the channel prediction apparatus, the channel prediction apparatus executes the channel prediction method provided in the above-mentioned various embodiments.
The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the channel prediction apparatus may read the executable instructions from the readable storage medium, and the execution of the executable instructions by the at least one processor causes the channel prediction apparatus to implement the channel prediction methods provided by the various embodiments described above.
Those of ordinary skill in the art will understand that: in the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Claims (24)

1. A method for channel prediction, comprising:
after receiving measurement information corresponding to Sounding Reference Signals (SRS) of a t-1 th subframe from terminal equipment, network equipment performs channel prediction according to an estimated value and the measurement information of a channel coefficient corresponding to each SRS of a subframe before the t subframe to obtain a predicted value of the channel coefficient corresponding to the SRS of the t subframe, wherein the measurement information comprises a timing adjustment amount and a phase difference, and t is greater than or equal to 2;
the network equipment performs channel estimation according to the SRS of the tth subframe received from the terminal equipment to obtain an estimated value of a channel coefficient corresponding to the SRS of the tth subframe;
the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe;
and the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframe before the t subframe to obtain the channel coefficient at the downlink signal transmission time after the SRS of the t subframe is received.
2. The method of claim 1, further comprising:
the network equipment receives measurement information corresponding to the SRS of the t subframe;
the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the tth subframe;
and the network equipment continues to perform channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe to obtain the channel coefficient at the downlink signal sending time after receiving the measurement information corresponding to the SRS of the t subframe.
3. The method according to claim 1 or 2, wherein the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the tth subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, and the method comprises:
the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and stores the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe;
and the network equipment performs channel prediction according to N estimated values of the channel coefficient after the second compensation corresponding to the SRS of the sub-frame before the tth sub-frame to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth sub-frame, wherein N is a preset positive integer, and the estimated values of the channel coefficient after the second compensation corresponding to the SRS of the N sub-frames comprise the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame.
4. The method of claim 3, wherein the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-1 th subframe according to the measurement information corresponding to the SRS in the subframe before the t-1 th subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS in the t-1 th subframe, and the method comprises:
the network equipment performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to historical accumulated timing adjustment quantity, so as to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment quantity is the sum of the timing adjustment quantities corresponding to the SRS of the subframes before the t-1 th subframe;
and the network equipment performs phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to a historical accumulated phase difference, so as to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated phase difference is the sum of phase differences corresponding to the SRS of the subframe before the t-1 th subframe.
5. The method according to any one of claims 1 to 4, wherein the network device performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS in the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS in the tth subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS in the tth subframe, and the method includes:
the network equipment determines the estimated values of the timing adjustment quantity of the tth subframe and the t-1 subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient corresponding to the SRS of the tth subframe;
the network equipment performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment of the t subframe and the t-1 subframe to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe:
the network equipment determines an estimated value of a phase difference between the tth subframe and the t-1 subframe according to a predicted value of a channel coefficient corresponding to the SRS of the tth subframe and an estimated value of a channel coefficient after timing adjustment amount compensation corresponding to the SRS of the tth subframe;
and the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.
6. The method according to claim 4, wherein the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-1 th subframe according to the historical accumulated timing adjustment to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-1 th subframe, and the method comprises:
the network device calculates the historical accumulated timing adjustment amount according to a timing adjustment amount delta tau (n) corresponding to an SRS of a subframe before the tth subframe, wherein n is 1,2, …, t-1
Figure FDA0002467382640000021
The network device is according to
Figure FDA0002467382640000022
Performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe through the following formula to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe
Figure FDA0002467382640000023
Figure FDA0002467382640000024
K is the total subcarrier number of the SRS;
wherein HkAnd (t-1) is an estimated value of a channel coefficient corresponding to the SRS in the t-1 th subframe.
7. The method of claim 6, wherein the phase compensation is performed, by the network device, on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-1 th subframe according to the historical accumulated phase difference to obtain a second compensated estimated value of the channel coefficient corresponding to the SRS in the t-1 th subframe, and the method comprises:
the network equipment according to the phase difference corresponding to the SRS of the sub-frame before the tth sub-frame
Figure FDA0002467382640000025
Figure FDA0002467382640000026
Calculating historical accumulated phase difference
Figure FDA0002467382640000027
The network device is according to
Figure FDA0002467382640000028
An estimated value of a channel coefficient after compensating for a timing adjustment amount corresponding to the SRS in the t-1 th subframe by the following formula
Figure FDA0002467382640000029
Performing phase compensation to obtain an estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th subframe
Figure FDA00024673826400000210
Figure FDA00024673826400000211
8. The method according to claim 7, wherein the network device performs channel prediction according to N of the estimated values of the second compensated channel coefficients corresponding to the SRS of the subframe before the tth subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, and the method comprises:
the network equipment estimates the channel coefficient after the second compensation according to the SRS corresponding to the sub-frame before the t sub-frame
Figure FDA0002467382640000031
N-1, 2, …, t-1, K-0, 1, …, K-1, to obtainA predicted value of a channel coefficient corresponding to the SRS of the t-th subframe
Figure FDA0002467382640000032
9. The method of claim 8, wherein the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the estimated values of the timing adjustment of the t-th subframe and the t-1-th subframe to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-th subframe, and the method comprises:
the network equipment estimates the timing adjustment quantity according to the t sub-frame and the t-1 sub-frame
Figure FDA0002467382640000033
An estimated value H of a channel coefficient corresponding to the SRS of the t-th subframe by the following formulak(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure FDA0002467382640000034
Figure FDA0002467382640000035
The network device performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe according to the estimated value of the phase difference between the t-th subframe and the t-1-th subframe to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe, and the method comprises the following steps:
the network equipment estimates the phase difference according to the t sub-frame and the t-1 sub-frame
Figure FDA0002467382640000036
By the followingFormula pair said
Figure FDA0002467382640000037
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure FDA0002467382640000038
Figure FDA0002467382640000039
10. The method according to claim 8, wherein the network device determines the estimated values of the timing adjustment amounts of the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe, and includes:
the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure FDA00024673826400000310
An estimated value H of a channel coefficient corresponding to the SRS in the t-th subframek(t) determining said by
Figure FDA00024673826400000311
Figure FDA00024673826400000312
Wherein (·)*Representing a complex conjugate.
11. The method according to claim 8, wherein the network device determines the estimated value of the phase difference between the tth subframe and the t-1 subframe according to the predicted value of the channel coefficient corresponding to the SRS in the tth subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS in the tth subframe, and includes:
the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t sub-frame
Figure FDA00024673826400000313
And said
Figure FDA00024673826400000314
The formula is determined by
Figure FDA00024673826400000315
Figure FDA00024673826400000316
Where angle () represents the phase of the complex number.
12. A network device, comprising:
a receiving module, configured to receive measurement information corresponding to a sounding reference signal SRS of a t-1 th subframe from a terminal device, where the measurement information includes a timing adjustment amount and a phase difference, and t is greater than or equal to 2;
a channel prediction module, configured to perform channel prediction according to an estimated value and measurement information of a channel coefficient corresponding to each SRS of a subframe before the tth subframe, to obtain a predicted value of the channel coefficient corresponding to the SRS of the tth subframe;
the receiving module is further configured to: receiving an SRS of a tth subframe from the terminal equipment;
the channel estimation module is used for carrying out channel estimation according to the SRS of the tth subframe to obtain an estimation value of a channel coefficient corresponding to the SRS of the tth subframe;
a processing module, configured to perform timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the predicted value of the channel coefficient corresponding to the SRS of the tth subframe, to obtain a first compensated estimated value of the channel coefficient corresponding to the SRS of the tth subframe;
the channel prediction module is further configured to: and performing channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal transmission time after the SRS of the tth subframe is received.
13. The network device of claim 12, wherein the receiving module is further configured to:
receiving measurement information corresponding to the SRS of the t subframe;
the processing module is further configured to: performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the tth subframe according to the measurement information corresponding to the SRS of the tth subframe and the measurement information corresponding to the SRS of the subframe before the tth subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe;
the channel prediction module is further configured to: and continuing channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the tth subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the tth subframe to obtain the channel coefficient at the downlink signal sending time after the measurement information corresponding to the SRS of the tth subframe is received.
14. The network device of claim 12 or 13, wherein the channel prediction module comprises:
a compensation unit, configured to perform timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to measurement information corresponding to the SRS of a subframe before the t-th subframe, obtain an estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, and store the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe;
and a channel prediction unit, configured to perform channel prediction according to N of the estimated values of the second compensated channel coefficients corresponding to the SRS of the subframe before the t-th subframe, to obtain a predicted value of the channel coefficient corresponding to the SRS of the t-th subframe, where N is a preset positive integer, and the estimated values of the second compensated channel coefficients corresponding to the SRS of the N subframes include the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th subframe.
15. The network device of claim 14, wherein the compensation unit is specifically configured to:
performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to historical accumulated timing adjustment quantity, so as to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment quantity is the sum of the timing adjustment quantities corresponding to the SRS of the subframes before the t-1 th subframe;
and performing phase compensation on the estimated value of the channel coefficient after timing adjustment compensation corresponding to the SRS of the t-1 th subframe according to a historical accumulated phase difference, so as to obtain the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated phase difference is the sum of phase differences corresponding to the SRS of the subframes before the t-1 th subframe.
16. The network device of any one of claims 12-15, wherein the processing module comprises:
a first determining unit, configured to determine estimated values of timing adjustment amounts of the tth subframe and the t-1 th subframe according to a predicted value of a channel coefficient corresponding to the SRS of the tth subframe and an estimated value of a channel coefficient corresponding to the SRS of the tth subframe;
a first compensation unit, configured to perform timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS in the t-th subframe according to the estimated values of the timing adjustment of the t-th subframe and the t-1-th subframe, so as to obtain an estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS in the t-th subframe:
a second determining unit, configured to determine an estimated value of a phase difference between the t-th subframe and the t-1 th subframe according to a predicted value of a channel coefficient corresponding to the SRS of the t-th subframe and an estimated value of a channel coefficient compensated by a timing adjustment amount corresponding to the SRS of the t-th subframe;
and a second compensation unit, configured to perform phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-th subframe according to the estimated value of the phase difference between the t-th subframe and the t-1-th subframe, to obtain an estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe.
17. The network device according to claim 15, wherein the compensation unit is specifically configured to:
calculating the historical accumulated timing adjustment amount according to a timing adjustment amount delta tau (n) corresponding to the SRS of the sub-frame before the tth sub-frame, wherein n is 1,2, …, t-1
Figure FDA0002467382640000041
According to the above
Figure FDA0002467382640000051
Performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe through the following formula to obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe
Figure FDA0002467382640000052
Figure FDA0002467382640000053
K is the total subcarrier number of the SRS;
wherein HkAnd (t-1) is an estimated value of a channel coefficient corresponding to the SRS in the t-1 th subframe.
18. The network device of claim 16, wherein the compensation unit is specifically configured to: :
according to a phase difference corresponding to an SRS of a subframe preceding the tth subframe
Figure FDA0002467382640000054
Calculating historical accumulated phase difference
Figure FDA0002467382640000055
According to the above
Figure FDA0002467382640000056
An estimated value of a channel coefficient after compensating for a timing adjustment amount corresponding to the SRS in the t-1 th subframe by the following formula
Figure FDA0002467382640000057
Performing phase compensation to obtain an estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th subframe
Figure FDA0002467382640000058
Figure FDA0002467382640000059
19. The network device of claim 18, wherein the channel prediction unit is specifically configured to:
according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the sub-frame before the tth sub-frame
Figure FDA00024673826400000510
N is 1,2, …, t-1, K is 0,1, …, K-1, and a predicted value of a channel coefficient corresponding to the SRS of the t-th subframe is obtained
Figure FDA00024673826400000511
20. The network device according to claim 19, wherein the first compensation unit is specifically configured to:
according to the estimated values of the timing adjustment quantity of the t sub-frame and the t-1 sub-frame
Figure FDA00024673826400000512
An estimated value H of a channel coefficient corresponding to the SRS of the t-th subframe by the following formulak(t) performing timing adjustment compensation to obtain an estimated value of a channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-th subframe
Figure FDA00024673826400000513
Figure FDA00024673826400000514
The second compensation unit is specifically configured to:
according to the estimated value of the phase difference between the t sub-frame and the t-1 sub-frame
Figure FDA00024673826400000515
By the following formula
Figure FDA00024673826400000516
Performing phase compensation to obtain an estimated value of the first compensated channel coefficient corresponding to the SRS of the t sub-frame
Figure FDA00024673826400000517
Figure FDA00024673826400000518
21. The network device according to claim 19, wherein the first determining unit is specifically configured to:
predicting value of channel coefficient corresponding to SRS of the t-th sub-frame
Figure FDA00024673826400000519
An estimated value H of a channel coefficient corresponding to the SRS in the t-th subframek(t) determining said by
Figure FDA00024673826400000520
Figure FDA00024673826400000521
Wherein (·)*Representing a complex conjugate.
22. The network device according to claim 19, wherein the second determining unit is specifically configured to:
predicting value of channel coefficient corresponding to SRS of the t-th sub-frame
Figure FDA00024673826400000522
And said
Figure FDA00024673826400000523
The formula is determined by
Figure FDA00024673826400000524
Figure FDA00024673826400000525
Where angle () represents the phase of the complex number.
23. A network device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the channel prediction method of any of claims 1-11 via execution of the executable instructions.
24. A readable storage medium having stored thereon instructions for execution, wherein when executed by at least one processor of a network device, the network device performs the channel prediction method of any of claims 1-11.
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