CN114884538A - Time offset estimation method and system for NR uplink control channel - Google Patents

Time offset estimation method and system for NR uplink control channel Download PDF

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CN114884538A
CN114884538A CN202210809107.5A CN202210809107A CN114884538A CN 114884538 A CN114884538 A CN 114884538A CN 202210809107 A CN202210809107 A CN 202210809107A CN 114884538 A CN114884538 A CN 114884538A
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CN114884538B (en
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吕磊
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Sichuan Innogence Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses a time offset estimation method and a system of an NR uplink control channel, wherein the method comprises the steps of obtaining a conjugate receiving signal obtained by extracting PUCCH receiving signals in the current time slot of a base station, carrying out conjugate multiplication operation on the signals and a local spread spectrum sequence of a current symbol frequency domain code channel 0, separating pilot frequency and data, removing an OCC sequence, and zeroing the conjugate receiving signal to
Figure DEST_PATH_IMAGE001
The method effectively improves the time offset estimation precision of the PUCCH multi-user multiplexing scene by the steps of performing IDFT operation on points, setting time domain search windows of different users, averaging pilot frequency and data related peak indexes, calculating the time offset value of each user and the like.

Description

Time offset estimation method and system for NR uplink control channel
Technical Field
The invention relates to the technical field of 5G communication, in particular to a time offset estimation method and a time offset estimation system for an NR uplink control channel.
Background
In an NR (new air interface, i.e., fifth generation mobile communication technology) system, an uplink control channel (PUCCH) format 0 format 1 carries information or distinguishes users by cyclic shifts different from a frequency domain base sequence. Different cyclic shifts are called as different code channels, and the code channel of a user in a scene with a large uplink time offset may be shifted from an expected position, resulting in degraded PUCCH detection and demodulation performance.
In order to overcome this problem, the base station first needs to estimate the time offset of the user, and then adjusts the detection scheme of the PUCCH according to the time offset estimation result, in which the accuracy of the time offset estimation is the key to affect the system performance. A plurality of prior patent documents disclose PUCCH time offset estimation methods, wherein chinese patent application with publication number CN112383940A proposes an IDFT-based time offset estimation method, which converts a received frequency domain signal into a time domain, and then calculates a user time offset through a peak index of a time domain waveform; chinese patent application publication No. CN102905357A proposes a method for estimating time offset according to a leakage power table lookup, which is based on the principle of calculating the power leakage ratio after performing truncation and IDFT operations on a received signal, and estimating the time offset according to a preset table. The method has the disadvantages that a PUCCH multi-user code division scene cannot be used, and particularly, due to the fact that time offsets of different users are different, after multi-user time domain waveforms are mutually superposed, the positions of related peak-to-peak values can deviate, and multipath power cannot be obtained, large errors can be generated by the scheme.
Disclosure of Invention
The technical problem solved by the invention is as follows: the time offset estimation method of the NR uplink control channel overcomes the defects that in the prior art, a PUCCH multi-user code division scene cannot be used, after multi-user time domain waveforms are mutually superposed, the position of a related peak-to-peak value can deviate, and multi-path power cannot be obtained, so that the time offset estimation error is large, and can effectively improve the time offset estimation precision of the PUCCH multi-user multiplexing scene.
Another objective of the present invention is to provide a system for estimating time offset of NR uplink control channel, which is used to implement the method for estimating time offset of NR uplink control channel.
The purpose of the invention is realized by the following technical scheme:
a time offset estimation method of an NR uplink control channel comprises the following steps:
removing OCC sequence: in each frequency hopping RB, carrying out conjugate multiplication accumulation operation on data of different symbols of the same subcarrier in a pilot frequency conjugate receiving signal and a data conjugate receiving signal with a pilot frequency OCC sequence and a data OCC sequence given by a protocol respectively to obtain the pilot frequency conjugate receiving signal of the OCC-removed sequence and the data conjugate receiving signal of the OCC-removed sequence at different frequency hopping positions;
and (3) IDFT operation: respectively filling zero to pilot frequency conjugate receiving signals of OCC removing sequences at different frequency hopping positions and data conjugate receiving signals of OCC removing sequences, and then obtaining pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions through IDFT operation;
searching for a correlation peak: setting time domain search windows of different users according to code channel indexes of the different users and a preset time offset estimation range, and respectively finding a maximum value index in pilot frequency time domain related signals and data time domain related signals of different frequency hopping RB positions by each user in the search window of each user, and respectively recording the maximum value index as a pilot frequency related peak index and a data related peak index of the different frequency hopping RB positions of the user;
correlation peak index average: averaging the pilot frequency related peak indexes of different frequency hopping RB positions of each user with the data related peak indexes to obtain the average related peak index of the user;
calculating the time offset: and calculating and obtaining a time bias estimation result of each user according to the average correlation peak index of each user.
Specifically, the method further comprises a PUCCH received signal extraction step: the base station extracts a PUCCH receiving signal from the received frequency domain receiving signal at a given time-frequency resource position according to the 3GPP 38.211 protocol, which is denoted as:
Figure 463975DEST_PATH_IMAGE001
wherein
Figure 262079DEST_PATH_IMAGE002
Is an index to a sub-carrier and,
Figure 69367DEST_PATH_IMAGE003
in order to be an index of the symbol,
Figure 660885DEST_PATH_IMAGE004
is the frequency domain frequency hopping position of the uplink control channel.
Specifically, the method further comprises a pilot and data separation step, wherein the pilot and data separation step comprises the following substeps:
frequency domain local sequence conjugationMultiplication operation: calculating local spreading sequences of different symbol frequency domain code channels 0 according to the protocol specified by 3GPP 38.211, and enabling a PUCCH receiving signal of each symbol to be matched with the local spreading sequences of the frequency domain code channels 0 corresponding to the symbols and frequency hopping positions
Figure 994652DEST_PATH_IMAGE005
The conjugate of the received signal is subjected to dot multiplication to obtain a conjugate received signal
Figure 521579DEST_PATH_IMAGE006
：
Figure 301317DEST_PATH_IMAGE007
And (3) separating pilot frequency from data: according to the position of pilot frequency and data symbol given by protocol
Figure 758843DEST_PATH_IMAGE008
Separation into pilot-conjugated received signals
Figure 884799DEST_PATH_IMAGE009
Receiving signals conjugated with data
Figure 707262DEST_PATH_IMAGE010
Wherein
Figure 36612DEST_PATH_IMAGE011
And
Figure 48562DEST_PATH_IMAGE012
respectively indicate the number of pilot symbols and the number of data symbols of the uplink control channel in the current time slot, as specified by the 3GPP 38.211 protocol.
Specifically, the step of OCC sequence removal comprises the step of receiving pilot conjugate receiving signals of OCC sequence removal of different frequency hopping positions
Figure 717440DEST_PATH_IMAGE013
Receiving signal with data conjugation of OCC sequence
Figure 773121DEST_PATH_IMAGE014
The calculation formula is as follows:
Figure 856613DEST_PATH_IMAGE015
Figure 859204DEST_PATH_IMAGE016
wherein
Figure 444906DEST_PATH_IMAGE017
And
Figure 609171DEST_PATH_IMAGE018
respectively represent a pilot time domain OCC sequence and a data time domain OCC sequence specified by the 3GPP 38.211 protocol.
Specifically, the calculation formula of the IDFT operation step is:
Figure 663846DEST_PATH_IMAGE019
wherein L represents IDFT point number, wherein
Figure 266866DEST_PATH_IMAGE020
Representation collection
Figure 644757DEST_PATH_IMAGE021
A vector of all the elements in (a),
Figure 557088DEST_PATH_IMAGE022
representation collection
Figure 82747DEST_PATH_IMAGE023
A vector of all elements in (a).
Specifically, the calculation formula for searching the correlation peak is as follows:
Figure 427140DEST_PATH_IMAGE024
then, finding out the indexes of the peak points of the relevant peaks in the time domain windows of the corresponding code channels in the pilot frequency time domain related signal and the data time domain related signal respectively:
Figure 472588DEST_PATH_IMAGE025
wherein
Figure 306552DEST_PATH_IMAGE027
Indicates a frequency hopping position index of the PUCCH,
Figure 257190DEST_PATH_IMAGE029
representing frequency domain code channels
Figure 451280DEST_PATH_IMAGE031
User at frequency hopping position
Figure 803764DEST_PATH_IMAGE027
The pilot-related peak-to-peak index on,
Figure 808629DEST_PATH_IMAGE029
representing frequency domain code channels
Figure 121930DEST_PATH_IMAGE033
User at frequency hopping position
Figure 808126DEST_PATH_IMAGE027
The data above correlate with the peak-to-peak index.
Specifically, the calculation formula of the average value of the correlation peak index is:
Figure 326701DEST_PATH_IMAGE034
wherein
Figure 502468DEST_PATH_IMAGE036
Representing frequency domain code channels
Figure 427698DEST_PATH_IMAGE038
User's hop location 0 pilot correlation peak point index,
Figure 465055DEST_PATH_IMAGE040
representing frequency domain code channels
Figure 854448DEST_PATH_IMAGE038
User's hop location 1 pilot correlation peak point index,
Figure 873220DEST_PATH_IMAGE036
representing frequency domain code channels
Figure 603191DEST_PATH_IMAGE038
The user's frequency hopping position 0 data correlation peak point index,
Figure 631190DEST_PATH_IMAGE040
representing frequency domain code channels
Figure 875089DEST_PATH_IMAGE038
The hopping position 1 data of the user is associated with the peak point index.
Specifically, the calculation process of the time offset is as follows:
Figure 143391DEST_PATH_IMAGE041
Figure 777634DEST_PATH_IMAGE042
wherein
Figure 406062DEST_PATH_IMAGE043
Which represents the operation of rounding off,
Figure 19314DEST_PATH_IMAGE044
which represents the FFT point of the system,
Figure 645468DEST_PATH_IMAGE046
representing frequency domain code channels
Figure 829325DEST_PATH_IMAGE038
The correlation peak-to-peak point index average of the user.
A time offset estimation system of an NR uplink control channel comprises the following modules:
and (3) removing an OCC sequence module: the method comprises the steps of obtaining pilot frequency conjugate receiving signals of OCC removing sequences and data conjugate receiving signals of OCC removing sequences at different frequency hopping positions;
an IDFT module: the system comprises a pilot frequency time domain related signal and a data time domain related signal which are used for obtaining different frequency hopping RB positions through IDFT operation;
search correlation peaks module: the time domain search window is used for setting time domain search windows of different users according to code channel indexes of the different users and a preset time offset estimation range, and each user finds a maximum value index in pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions in the search window of the user;
correlation peak index averaging module: the average operation is carried out on the pilot frequency correlation peak index and the data correlation peak index of different frequency hopping RB positions of each user to obtain the average correlation peak index of the user;
a time offset calculation module: and the method is used for calculating and obtaining the time bias estimation result of each user according to the average correlation peak index of the user.
The PUCCH receiving signal extracting module is configured to extract a PUCCH receiving signal at a given time-frequency resource position in a received frequency domain receiving signal, and the pilot and data separating module is configured to calculate local spreading sequences of different symbol frequency domain code channels 0 according to a protocol, perform a dot product operation on a conjugate of the PUCCH receiving signal of each symbol and the local spreading sequence of the frequency domain code channel 0 to obtain a conjugate receiving signal, and divide the conjugate receiving signal into a pilot conjugate receiving signal and a data conjugate receiving signal according to a pilot symbol position and a data symbol position given by the protocol.
The invention has the beneficial effects that:
the user time offset estimation precision depends on the time domain correlation peak-to-peak index estimation precision, in a PUCCH multi-user code division scene, the time offsets of different users are different, the time domain correlation peaks of different users are mutually superposed to cause the correlation peak-to-peak index to shift, and because the modulation signal phases of different users are mutually independent, the peak index shift error generated after the data correlation peaks of different users are mutually superposed is different from the peak index shift error generated after the pilot frequency correlation peaks are superposed, and the pilot frequency correlation peak index and the data correlation peak index can be considered as mutually independent and distributed errors, so that the peak index shift error can be obviously reduced by averaging the pilot frequency correlation peak index and the data correlation peak index, and the time offset estimation precision is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of an implementation of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description will be selected to more clearly understand the technical features, objects and advantages of the present invention. It should be understood that the embodiments described are illustrative of some, but not all embodiments of the invention, and are not to be construed as limiting the scope of the invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step are within the scope of the present invention.
Example 1
In this embodiment, assuming that the number of base station antennas is 1, PUCCH format 1 employs frequency hopping transmission (2 hopping RB positions, respectively designated as hopping RB0 and hopping RB 1), and when a single PUCCH is transmittedThe PUCCH in the slot occupies 14 OFDM symbols (7 symbols in each frequency hopping position), and 4 users use the same pilot frequency time domain OCC code
Figure 12175DEST_PATH_IMAGE047
（
Figure 168350DEST_PATH_IMAGE048
) And data time domain OCC code
Figure 27722DEST_PATH_IMAGE049
（
Figure 948142DEST_PATH_IMAGE050
) Transmitting PUCCH format 1 signals at the same time-frequency position, wherein the frequency domain code channel numbers of 4 users are 0/3/6/9 respectively, and the frequency domain spreading sequence is divided into
Figure 856055DEST_PATH_IMAGE051
Wherein
Figure 929053DEST_PATH_IMAGE004
Which indicates the position of the frequency hopping,
Figure 897009DEST_PATH_IMAGE052
indicates the number of the frequency-domain code channel,
Figure 806191DEST_PATH_IMAGE002
it is indicated that the sub-carrier index,
Figure 580112DEST_PATH_IMAGE003
indicating the OFDM symbol index within a single hopping RB.
It should be noted that the execution sequence of each step described in this embodiment is not unique, for example, step 6 may be executed at any position of this step or before this step, so this embodiment only describes one possible execution sequence.
As shown in fig. 1, step 1, extracting a PUCCH received signal in the current slot of the base station: the base station extracts PUCCH receiving signals at time-frequency positions specified by a protocol
Figure 445300DEST_PATH_IMAGE053
In the step 2, the step of mixing the raw materials,
Figure 895741DEST_PATH_IMAGE054
obtaining a conjugate receiving signal by conjugate multiplication operation with a local spreading sequence of a current symbol frequency domain code channel 0
Figure 541486DEST_PATH_IMAGE008
：
Figure 56781DEST_PATH_IMAGE055
And step 3, separating pilot frequency from data: according to the position of pilot frequency and data symbol given by protocol
Figure 589525DEST_PATH_IMAGE008
Separation into pilot-conjugated received signals
Figure 961600DEST_PATH_IMAGE056
Receiving signals conjugated with data
Figure 32325DEST_PATH_IMAGE057
:
Figure 391456DEST_PATH_IMAGE058
Step 4, removing OCC sequence, obtaining pilot frequency conjugate receiving signal of OCC sequence removed at different frequency hopping positions
Figure 293553DEST_PATH_IMAGE013
Receiving signal with data conjugation of OCC sequence
Figure 774213DEST_PATH_IMAGE014
:
Figure 145283DEST_PATH_IMAGE059
Step 5, conjugationZero-filling of received signal to
Figure 799118DEST_PATH_IMAGE060
Performing IDFT operation on the points to obtain pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions
Figure 804989DEST_PATH_IMAGE061
Where L represents IDFT point numbers.
Step 6, firstly setting time domain search windows of different users, and calculating the time domain search windows of 4 users according to the frequency domain code channel numbers and the IDFT points of the different users under the assumption that the maximum time offset search range of each user is from 0.5 code channel in advance to 1 code channel in delay
Figure 722129DEST_PATH_IMAGE062
Then, peak point indexes are found in 4 time domain windows in the pilot frequency time domain related signal and the data time domain related signal respectively
Figure 564184DEST_PATH_IMAGE063
Step 7, averaging the pilot frequency of 2 frequency hopping positions and the data correlation peak index of the users with 4 code channels to obtain the average correlation peak index of each user
Figure 772442DEST_PATH_IMAGE064
Step 8, calculating the time offset value of each user by taking the system time domain sampling point (Ts) as a unit:
Figure 649131DEST_PATH_IMAGE065
Figure 471594DEST_PATH_IMAGE066
wherein
Figure 50211DEST_PATH_IMAGE043
Which represents the operation of rounding off,
Figure 311429DEST_PATH_IMAGE044
the FFT point number of the system is represented, the time delay is positive to represent the arrival time delay of the user signal, and the time delay is negative to represent the arrival time advance of the user signal.
Table 1 compares the performance of the time offset estimation of the present invention with that of the prior art, the number of FFT points of the NR system in the simulation is 4096, the subcarrier spacing is 30kHz, 4 users transmit PUCCH format 1 in multiplexing on the frequency domain code channel 0/3/6/9 on the same OCC, and the real time offset of 4 users is 0/400/800/1200 ns. According to simulation results, the scheme of the patent can obtain obvious time offset estimation precision improvement compared with the traditional scheme.
Table 1: and (5) a performance simulation table of the time offset estimation method.
Figure 980307DEST_PATH_IMAGE067
The embodiment of the invention also comprises a time offset estimation system of the NR uplink control channel, which comprises the following modules:
OCC sequence removal module: and the method is used for acquiring the pilot conjugate received signal of the de-OCC sequence and the data conjugate received signal of the de-OCC sequence at different frequency hopping positions.
An IDFT module: and the pilot frequency time domain related signal and the data time domain related signal are used for obtaining different frequency hopping RB positions through IDFT operation.
Search correlation peaks module: and the time domain search windows are used for setting time domain search windows of different users according to the code channel indexes of the different users and a preset time offset estimation range, and each user finds a maximum value index in pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions in the search window of the user.
Correlation peak index averaging module: and averaging the pilot frequency correlation peak indexes and the data correlation peak indexes of different frequency hopping RB positions of each user to obtain the average correlation peak index of the user.
A time offset calculation module: and the method is used for calculating and obtaining the time bias estimation result of each user according to the average correlation peak index of the user.
The system described in this embodiment further includes a PUCCH received signal extraction module and a pilot and data separation module, where the PUCCH received signal extraction module is configured to extract a PUCCH received signal at a given time-frequency resource position in the received frequency domain received signal by the base station, the pilot and data separation module is configured to calculate local spreading sequences of different symbol frequency domain code channels 0 according to a protocol, perform a dot-product operation on a conjugate of the PUCCH received signal of each symbol and the local spreading sequence of the frequency domain code channel 0 to obtain a conjugate received signal, and divide the conjugate received signal into a pilot conjugate received signal and a data conjugate received signal according to a pilot symbol position and a data symbol position given by the protocol.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required in this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a ROM, a RAM, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (10)

1. A method for estimating time offset of an NR uplink control channel, comprising:
removing OCC sequence: in each frequency hopping RB, carrying out conjugate multiplication accumulation operation on data of different symbols of the same subcarrier in a pilot frequency conjugate receiving signal and a data conjugate receiving signal with a pilot frequency OCC sequence and a data OCC sequence given by a protocol respectively to obtain the pilot frequency conjugate receiving signal of the OCC-removed sequence and the data conjugate receiving signal of the OCC-removed sequence at different frequency hopping positions;
and (3) IDFT operation: respectively carrying out zero filling on pilot frequency conjugate receiving signals of OCC removing sequences at different frequency hopping positions and data conjugate receiving signals of OCC removing sequences, and then obtaining pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions through IDFT operation;
searching for a correlation peak: setting time domain search windows of different users according to code channel indexes of the different users and a preset time offset estimation range, and respectively finding a maximum value index in pilot frequency time domain related signals and data time domain related signals of different frequency hopping RB positions by each user in the search window of each user, and respectively recording the maximum value index as a pilot frequency related peak index and a data related peak index of the different frequency hopping RB positions of the user;
correlation peak index averaging: averaging the pilot frequency related peak indexes of different frequency hopping RB positions of each user with the data related peak indexes to obtain the average related peak index of the user;
calculating the time offset: and calculating and obtaining a time bias estimation result of each user according to the average correlation peak index of each user.
2. The method for estimating time offset of an NR uplink control channel according to claim 1, further comprising a PUCCH received signal extracting step of: the base station extracts a PUCCH receiving signal from the received frequency domain receiving signal at a given time-frequency resource position according to the 3GPP 38.211 protocol, which is denoted as:
Figure 135388DEST_PATH_IMAGE001
wherein
Figure 114845DEST_PATH_IMAGE002
Is an index to a sub-carrier and,
Figure 956899DEST_PATH_IMAGE003
in order to be an index of the symbol,
Figure 414425DEST_PATH_IMAGE004
is the frequency domain frequency hopping position of the uplink control channel.
3. The method of estimating time offset for an NR uplink control channel according to claim 2, further comprising a pilot and data separation step, wherein the pilot and data separation step comprises the following substeps:
conjugate multiplication operation of local sequences in frequency domain: calculating local spreading sequences of different symbol frequency domain code channels 0 according to the protocol specified by 3GPP 38.211, and enabling PUCCH receiving signals of each symbol to be matched with the local spreading sequences of the frequency domain code channels 0 corresponding to the symbols and frequency hopping positions
Figure 228797DEST_PATH_IMAGE005
By conjugation ofDot product operation to obtain a conjugate received signal
Figure 615042DEST_PATH_IMAGE006
Is recorded as:
Figure 944392DEST_PATH_IMAGE007
；
and (3) separating pilot frequency from data: according to the position of pilot frequency and data symbol given by protocol
Figure 143292DEST_PATH_IMAGE008
Separation into pilot-conjugated received signals
Figure 874488DEST_PATH_IMAGE009
Receiving signals conjugated with data
Figure 930168DEST_PATH_IMAGE010
Wherein
Figure 245350DEST_PATH_IMAGE011
And
Figure 982362DEST_PATH_IMAGE012
respectively indicate the number of pilot symbols and the number of data symbols of the uplink control channel in the current time slot, as specified by the 3GPP 38.211 protocol.
4. The method of claim 3, wherein the step of OCC sequence removal comprises removing pilot-conjugated received signals of OCC sequences at different frequency hopping positions
Figure 568064DEST_PATH_IMAGE013
Receiving signal with data conjugation of OCC sequence
Figure 60225DEST_PATH_IMAGE014
Is calculated, whichThe formula is as follows:
Figure 301850DEST_PATH_IMAGE015
wherein
Figure 639291DEST_PATH_IMAGE016
Respectively, a pilot time domain OCC sequence and a data time domain OCC sequence specified by the 3GPP 38.211 protocol.
5. The method of claim 4, wherein the IDFT operation step is calculated as follows:
Figure 846543DEST_PATH_IMAGE017
wherein L represents IDFT point number, wherein
Figure 244027DEST_PATH_IMAGE018
Representation collection
Figure 972948DEST_PATH_IMAGE019
A vector of all the elements in (a),
Figure 114080DEST_PATH_IMAGE020
representation collection
Figure 1
A vector of all elements in (a).
6. The method of estimating time offset of an NR uplink control channel according to claim 5, wherein the calculation formula of the search correlation peak is:
frequency domain code channel 0 user:
Figure 446021DEST_PATH_IMAGE022
；
frequency domain code channel
Figure 963371DEST_PATH_IMAGE023
The user:
Figure 908193DEST_PATH_IMAGE024
then, finding out the indexes of the peak points of the relevant peaks in the time domain windows of the corresponding code channels in the pilot frequency time domain related signal and the data time domain related signal respectively:
Figure 260677DEST_PATH_IMAGE025
wherein
Figure 265542DEST_PATH_IMAGE026
The index of the frequency hopping position of (c),
Figure 765794DEST_PATH_IMAGE027
representing frequency domain code channels
Figure 186411DEST_PATH_IMAGE028
User at frequency hopping position
Figure 222762DEST_PATH_IMAGE028
The pilot-related peak-to-peak index on,
Figure 398528DEST_PATH_IMAGE029
representing frequency domain code channels
Figure 386076DEST_PATH_IMAGE030
User at frequency hopping position
Figure 610384DEST_PATH_IMAGE028
The data above correlate with the peak-to-peak index.
7. The method of claim 6, wherein the mean correlation peak index is calculated as:
Figure 734198DEST_PATH_IMAGE032
(ii) a Wherein
Figure 579401DEST_PATH_IMAGE033
Representing frequency domain code channels
Figure 991927DEST_PATH_IMAGE034
User's hop location 0 pilot correlation peak point index,
Figure 82243DEST_PATH_IMAGE035
representing frequency domain code channels
Figure 326143DEST_PATH_IMAGE034
User's hop location 1 pilot correlation peak point index,
Figure 515816DEST_PATH_IMAGE033
representing frequency domain code channels
Figure 477955DEST_PATH_IMAGE034
The user's frequency hopping position 0 data correlation peak point index,
Figure 607848DEST_PATH_IMAGE036
representing frequency domain code channels
Figure 909516DEST_PATH_IMAGE034
The hopping position 1 data of the user is associated with the peak point index.
8. The method of claim 1, wherein the time offset is calculated by:
Figure 332407DEST_PATH_IMAGE037
where round represents the rounding operation,
Figure 781843DEST_PATH_IMAGE038
which represents the FFT point of the system,
Figure 151644DEST_PATH_IMAGE039
representing frequency domain code channels
Figure 104557DEST_PATH_IMAGE040
The correlation peak-to-peak point index average of the user.
9. A system for estimating time offset of an NR uplink control channel, comprising:
OCC sequence removal module: the method comprises the steps of obtaining pilot frequency conjugate receiving signals of OCC removing sequences and data conjugate receiving signals of OCC removing sequences at different frequency hopping positions;
an IDFT module: the system comprises a pilot frequency time domain related signal and a data time domain related signal which are used for obtaining different frequency hopping RB positions through IDFT operation;
search correlation peaks module: the time domain search window is used for setting time domain search windows of different users according to code channel indexes of the different users and a preset time offset estimation range, and each user finds a maximum value index in pilot frequency time domain related signals and data time domain related signals at different frequency hopping RB positions in the search window of the user;
correlation peak index averaging module: the average operation is carried out on the pilot frequency correlation peak index and the data correlation peak index of different frequency hopping RB positions of each user to obtain the average correlation peak index of the user;
a time offset calculation module: and the method is used for calculating and obtaining the time bias estimation result of each user according to the average correlation peak index of the user.
10. The system according to claim 9, further comprising a PUCCH received signal extraction module and a pilot and data separation module, wherein the PUCCH received signal extraction module is configured to extract, by the base station, a PUCCH received signal at a given time-frequency resource location in the received frequency-domain received signal, and the pilot and data separation module is configured to calculate, according to a protocol, local spreading sequences of different symbol frequency-domain code channels 0, perform a dot product operation on a conjugate of the PUCCH received signal of each symbol and the local spreading sequence of frequency-domain code channel 0 to obtain a conjugate received signal, and divide the conjugate received signal into a pilot conjugate received signal and a data conjugate received signal according to a pilot symbol location and a data symbol location given by the protocol.
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