CN110572346A - Pilot signal sending method and related equipment - Google Patents
Pilot signal sending method and related equipment Download PDFInfo
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- CN110572346A CN110572346A CN201910866265.2A CN201910866265A CN110572346A CN 110572346 A CN110572346 A CN 110572346A CN 201910866265 A CN201910866265 A CN 201910866265A CN 110572346 A CN110572346 A CN 110572346A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
- H04J13/0062—Zadoff-Chu
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/262—Reduction thereof by selection of pilot symbols
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
Abstract
the invention provides a pilot signal sending method and equipment, which relate to the field of communication, and comprise the following steps: mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set; transmitting the set of subcarriers mapped with pilot signals to a terminal; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence. The pilot signal sending method provided by the invention can use the ZC sequence to generate the pilot signal or carry out discrete Fourier transform on the pseudo-noise sequence to generate the pilot signal, thereby reducing the peak-to-average power ratio (PAPR) and improving the power of the transmitted signal.
Description
Technical Field
the present invention relates to the field of communications, and in particular, to a pilot signal sending method and related devices.
background
With the development of scientific technology, communication technology has been developed greatly, and satellite communication technology has become an indispensable communication technology in human life, and in the existing satellite communication system, when two communication parties communicate, a signal transmitting end often transmits a downlink pilot signal, such as a Cell-specific reference signal (CRS), to a terminal, so that the terminal can estimate a channel according to the downlink pilot signal.
The inventor of the present invention finds that when a pilot signal is generated by applying the existing protocol of a satellite system, there is a high Peak to Average Power Ratio (PAPR), and in this case, in order to maintain signal transmission without distortion, the signal transmission Power needs to be reduced, which further causes the reduction of the received signal-to-noise Ratio, and the accuracy of receiving end channel estimation is reduced.
Disclosure of Invention
the technical problem to be solved by the present invention is to provide a pilot signal transmission method, which can apply a ZC sequence to generate a pilot signal, or perform discrete fourier transform on a pseudo-noise sequence to generate a pilot signal, thereby reducing PAPR and improving transmission signal power.
the invention also provides a pilot signal sending device, which is used for ensuring the realization and the application of the method in practice.
a pilot signal transmission method, comprising:
Mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
Transmitting the set of subcarriers mapped with pilot signals to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
optionally, the method for generating the pilot signal according to the ZC sequence includes:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the pilot configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,is the number of sub-carriers,Is less thanthe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsIs a number of the time slot and is,is a cell identification number, xqAnd (m) is a ZC sequence carrying a time slot number and a cell identification number.
optionally, the method for generating the pilot signal according to the ZC sequence includes:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
the second pilot signal generation formula is:
wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,is the number of sub-carriers,Is less thanThe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsIs the time slot number of the downlink time slot,is a cell identification number, xqAnd (m) is a ZC sequence carrying a time slot number and a cell identification number.
the above method, optionally, performs a discrete fourier transform on the pseudo noise sequence to generate a pilot signal, and includes:
generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
Obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
wherein N isCrsSeqc is the number of sampling points and the pseudo noise sequence;
The pseudo noise sequence initialization identifier generation formula is as follows:
Or, it is:
wherein, cinitinitializing an identification for the pseudo-noise sequence, nsis the slot number, l is the OFDM symbol number,Is a cell identification number.
Optionally, the method for mapping the pre-generated pilot signal to the target subcarrier in the preset subcarrier set includes:
Acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
and mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
a pilot signal transmission apparatus, the apparatus comprising a processor, a memory, and a program stored on the memory and executable on the processor, the processor when executing the program implementing the steps of:
mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
transmitting the set of subcarriers to which the pilot signal has been mapped to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
optionally, the above apparatus is further configured to, when the processor executes the program, implement the following steps:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c),nsIs the slot number, q is the root of the ZC sequence,is cell identity, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
Optionally, the above apparatus is further configured to, when the processor executes the program, implement the following steps:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
The second pilot signal generation formula is:
Wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsis the time slot number of the downlink time slot,Is cell identity, xq(m) is a carriera ZC sequence with a time slot number and a cell identification number.
optionally, the above apparatus is further configured to, when the processor executes the program, implement the following steps:
generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
Obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
Wherein N isCrsSeqC is the number of sampling points and the pseudo noise sequence;
the pseudo noise sequence initialization identifier generation formula is as follows:
or, it is:
Wherein, cinitInitializing an identification for the pseudo-noise sequence, nsis the slot number, l is the OFDM symbol number,Is a cell identification number.
Optionally, the above apparatus is further configured to, when the processor executes the program, implement the following steps:
Acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
Determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
and mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
a storage medium comprising stored instructions, wherein the instructions, when executed, control a device on which the storage medium is located to perform a pilot signal transmission method as described above.
An electronic device comprising a memory, and one or more instructions stored in the memory and configured to be executed by one or more processors to perform a pilot signal transmission method as described above.
A gateway station, comprising:
The processor is used for mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence;
And the communication circuit is used for transmitting the subcarrier set mapped with the pilot signal to a terminal.
Compared with the prior art, the invention has the following advantages:
The invention provides a pilot signal sending method, which comprises the following steps: mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set; transmitting the set of subcarriers mapped with pilot signals to a terminal; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence. The pilot signal sending method provided by the invention can be used for generating the pilot signal by applying the ZC sequence or generating the pilot signal by performing discrete Fourier transform on the pseudo-noise sequence, thereby reducing the PAPR and improving the power of the transmitted signal.
Drawings
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flowchart of a method for transmitting a pilot signal according to the present invention;
Fig. 2 is a diagram illustrating an exemplary method for transmitting a pilot signal according to the present invention;
fig. 3 is a diagram of another exemplary method for transmitting a pilot signal according to the present invention;
fig. 4 is a schematic structural diagram of a pilot signal transmitting apparatus according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided in the present invention;
fig. 6 is a schematic structural diagram of a gateway station according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention is applicable to a wide variety of general or special purpose wireless communication systems, such as: satellite communication systems, trunked communication systems and devices, broadband communication systems and devices or other wireless communications, and the like.
the embodiment of the invention provides a pilot signal sending method, which can be applied to a gateway station in a satellite communication system, and the execution main body of the method can be the gateway station. The method for sending the signal pilot signal is shown in fig. 1, and specifically includes:
S101: and mapping the pre-generated pilot signal to a target subcarrier in a preset subcarrier set.
In the method provided by the embodiment of the present invention, the pilot signal is generated according to a ZC (Zadoff-chu) sequence or generated by performing discrete fourier transform on a Pseudo-Noise PN (Pseudo-Noise) sequence.
In the method provided by the embodiment of the present invention, the pilot signal may be a downlink pilot signal, and optionally, the pilot signal is a CRS sequence, where multiple manners of generating the CRS sequence may be provided, the ZC sequence may be applied to generate the pilot signal, and a discrete fourier transform may also be performed on the pseudo noise sequence to generate the pilot signal.
In the method provided by the embodiment of the present invention, the subcarrier set includes each subcarrier, the subcarriers to be loaded with the pilot signals are determined as target subcarriers, and the number of the target subcarriers is multiple.
S102: and transmitting the subcarrier set mapped with the pilot signals to a terminal.
In the method provided by the embodiment of the invention, the sub-carrier set mapped with the pilot signal is subjected to inverse fast Fourier transform and is sent to the terminal.
In the method provided by the embodiment of the invention, if the pilot signal is generated by performing discrete fourier transform on the pseudo noise sequence, the subcarrier set mapped with the pilot signal is sent to the terminal, so that the pseudo noise sequence modulated by orthogonal frequency division multiplexing DFT-S-OFDM expanded by the discrete fourier transform can be considered to be sent to the terminal, and the PAPR can be effectively lowered.
specifically, the terminal may be a base station, and when receiving the pilot signal, the terminal may perform frequency offset estimation and channel estimation according to the pilot signal.
the method for sending the pilot signal provided by the embodiment of the invention comprises the following steps: mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set; transmitting the set of subcarriers mapped with pilot signals to a terminal; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence. The pilot signal sending method provided by the invention can use the ZC sequence to generate the pilot signal, or carry out discrete Fourier transform on the pseudo-noise sequence to generate the pilot signal, can reduce the PAPR, and improve the power of the transmitted signal, thereby improving the accuracy of the terminal channel estimation.
in the pilot signal transmitting method provided in the embodiment of the present invention, based on the foregoing implementation process, specifically, the process of generating the pilot signal according to the ZC sequence includes:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the CRS configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,is the number of sub-carriers,Is less thanThe maximum number of the prime numbers of (c),q is the root of the ZC sequence,nsis a number of the time slot and is,Is cell identity, xqAnd (m) is a ZC sequence carrying a time slot number and a cell identification number.
in the method provided by the embodiment of the invention, q is the root of a ZC sequence, different q represent different ZC sequences, and q and n ares、is not unique.
In the method provided by the embodiment of the invention, the pilot signal is a CRS sequence, specifically, q and ns、The function relation of the CRS is not unique and is irrelevant to the serial number l of the OFDM symbol, so if two CRS symbols exist in the same time slot, the transmitting sequences of the two CRS symbols are the same; wherein q and ns、the functional relationship of (a) may be as follows:
in the method provided by the embodiment of the inventionis mapped onto the corresponding sub-carrier position a (l, k), where,And l is the OFDM symbol number.
optionally, as shown in fig. 2, a case where CRS symbols are densely arranged among frequency domain subcarriers is shown; the horizontal axis represents OFDM symbols (time) and the vertical axis represents subcarriers (frequency), wherein the mapping of CRS occupies an entire OFDM symbol. The first CRS symbol is located at symbol 0, and the second CRS is an auxiliary CRS and is located at symbol 7.
in the method provided by the embodiment of the invention, when the terminal receives the CRS, the CRS can be used for frequency offset estimation and channel estimation.
the specific process of frequency offset estimation is as follows: when two CRS frequency domain symbols are in the same time slot, the first CRS frequency domain symbol is YCRS(0, K) and the second CRS frequency domain symbol is YCRS(1, k) wherein,Calculating the correlation between the first CRS frequency domain symbol and the second CRS frequency domain symbol; the specific calculation formula of the correlation is as follows:
Then, the CRS based doppler frequency offset may be:
Wherein, 6.25 x 10-5(s) is the time interval between two CRSs of the same slot in the satellite protocol.
the specific process of channel estimation is as follows: will YCRSand (l, k) and the conjugate of the frequency domain transmitting sequence a (l, k) are multiplied to obtain an LS channel, and the LS channel is subjected to smooth noise reduction processing.
in the method provided by the embodiment of the invention,The expression is the q-th ZC sequence, and q, n and m are integers.
In the pilot signal transmitting method provided in the embodiment of the present invention, based on the foregoing implementation process, specifically, the process of generating the pilot signal according to the ZC sequence includes:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
the second pilot signal generation formula is:
wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,is the number of sub-carriers,is less thanThe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsIs the time slot number of the downlink time slot,Is cell identity, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
in the method provided by the embodiment of the invention, q is the root of a ZC sequence, different q represent different ZC sequences, and q and n ares、is not unique.
In the method provided by the embodiment of the invention, q and n are usedsCell identification numberIs not unique and is independent of the OFDM symbol number, so that if there are two pilot symbols in the same slot, the transmitted sequences of the two pilot symbols are the same, where q and n ares、The functional relationship of (a) may be as follows:
in the method provided in the embodiment of the present invention, the process of mapping the pre-generated pilot signal to the target subcarrier in the preset subcarrier set may be:
the following steps can be also included:
In the method provided by the embodiment of the invention, in the subcarrier set, the subcarriers with the sequence numbers of even are the target subcarriers, the subcarriers with the sequence numbers of odd are the null subcarriers, the subcarrier set mapped with the pilot signals is subjected to inverse fast fourier transform, and the inverse fast fourier transform is sent to the terminal.
alternatively, as shown in fig. 3, CRS symbols are spaced between frequency domain subcarriers, where the horizontal axis represents OFDM symbols (time) and the vertical axis represents subcarriers (frequency). Since the downlink uses DFT-s-OFDM, the mapping of CRS is required to occupy one entire OFDM symbol. The first CRS symbol is located at OFDM symbol 0, and the second CRS is an auxiliary CRS and is located at OFDM symbol 7.
in the method provided by the embodiment of the present invention, the pilot signal is a CRS sequence, and the process of the terminal performing frequency offset estimation according to the CRS sequence is as follows:
In the received pilot signal, when a CRS frequency domain symbol in the same timeslot is one, the CRS frequency domain symbol may be:
wherein N isFFFFor the number of time-domain sample points of the symbol,and may be 1 or 2. Dividing the time domain signal into a first sub-time domain signal and a second sub-time domain signal, and calculating the correlation between the first sub-time domain signal and the second sub-time domain signal, wherein the specific process of calculating the correlation may be:
then there are CRS based doppler estimates as:
in the received pilot signal, when two CRS frequency domain symbols are in the same time slot, the first CRS frequency domain symbol is YCRS(0, n) frequency domain symbol of second CRS is YCRS(1, n) calculating a correlation between the first CRS frequency domain symbols and the second frequency domain symbols; the specific calculation formula of the correlation is as follows:
Then, the CRS based doppler frequency offset may be:
in the method provided by the embodiment of the present invention, the pilot signal is a CRS sequence, and the process of the terminal performing frequency offset estimation according to the CRS sequence is as follows:
Will YCRSAnd (l, k) and the conjugate of the frequency domain emission sequence a (l, k) are multiplied to obtain an LS channel, and then smooth noise reduction and frequency domain interpolation processing are carried out.
In the pilot signal transmission method provided in the embodiment of the present invention, based on the implementation process, specifically, the process of performing discrete fourier transform on the pseudo noise sequence to generate the pilot signal includes:
generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
Obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
wherein N isCrsSeqthe number of sampling points;
the pseudo noise sequence initialization identifier generation formula is as follows:
or the following steps:
Wherein, cinitinitializing an identification for the pseudo-noise sequence, nsis the slot number, l is the OFDM symbol number,is a cell identification number.
In the method provided by the embodiment of the invention, the pseudo noise sequence initialization identifier is a PN sequence initialization ID.
in the method provided by the embodiment of the invention, NCrsSeqthe product of powers of 2, 3, 5, optionally N, may be chosenCrsSeq3072 or NCrsSeq＝3456。
In the method provided by the embodiment of the invention, cinitAnd ns、l is not a unique functional relationship, and is specific to cinitMay or may not be related to the OFDM symbol number l, when cinitwhen the number is irrelevant to the OFDM symbol number l, if two CRS symbols exist in the same slot, the transmitting sequences of the two CRS symbols are the same; wherein when cinitIndependently of l, there may be:
when c is going toinitwhen related to l, there may be:
In the method provided in the embodiment of the present invention, the process of mapping the pre-generated pilot signal to the target subcarrier in the preset subcarrier set may be:
To pairCarry out NCrsSeqFourier transform of the points oftransforming to frequency domain to obtainand will beMapping to a target subcarrier in the subcarrier set, specifically:
In the method provided by the embodiment of the invention, the sub-carrier wave mapped with the pilot frequency is sent to the terminal, so that the terminal carries out frequency offset estimation and channel estimation according to the pilot frequency signal; the process of using the pilot signal CRS for frequency offset estimation is as follows:
taking a time domain PDP peak position sampling point of a CRS symbol as a starting point, taking a time domain receiving sequence of the CRS symbol,n＝0,...,NFFF-1,NFFFfor the number of time-domain sample points of the symbol,And may be 1 or 2. The CRS symbols have a transmit time domain sequence s (l, N), N being 0FFT1, the process of calculating the similarity may be:
then the CRS based doppler estimate is:
if the current time slot has two CRS symbols, the phase difference between the two CRS symbols of the time slot can be used to further calculate FOCRSwith the first CRS frequency domain symbol being YCRS(0, n) frequency domain symbol of second CRS is YCRS(1, n), the correlation is calculated as follows:
then, the CRS based doppler frequency offset may be:
if the transmitting symbols of the two CRSs are the same, the CRS is directly used for receiving symbol estimation, and if the transmitting symbols of the two CRSs are different, the noise-reduced channel is used for estimation.
in the method provided by the embodiment of the invention, the process of using the pilot signal CRS to carry out channel estimation is as follows:
will YCRSthe (l, k) and the conjugate of the frequency domain transmitting sequence a (l, k) are multiplied, the pilot signal can be converted from the frequency domain to the time domain, the time domain signal is processed, the sampling point with large time domain amplitude is reserved, the sampling point with small time domain amplitude is set to zero, and then the processed time domain signal is converted back to the frequency domain, so that the functions of channel estimation and noise reduction are realized.
In the pilot signal sending method provided in the embodiment of the present invention, based on the foregoing implementation process, specifically, the mapping a pre-generated pilot signal to each preset subcarrier to obtain an initial resource block includes:
acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
and mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
in the method provided by the embodiment of the present invention, in an existing satellite communication system, for downlink 400M, the number of subcarriers in a subcarrier set may be 3168.
in the method provided by the embodiment of the present invention, the number of the target subcarriers in the subcarrier set is multiple, specifically, each subcarrier in the subcarrier set can be determined as a target subcarrier, a subcarrier with an even sequence number can also be determined as a target subcarrier, a subcarrier with an odd sequence number can also be determined as a target subcarrier, and specifically, the method can be set by a technician according to an actual situation.
the above specific implementations and the derivation processes of the implementations are all within the scope of the present invention.
corresponding to the method described in fig. 1, an embodiment of the present invention further provides a pilot signal sending apparatus, which is used for implementing the method in fig. 1 specifically, the pilot signal sending apparatus provided in the embodiment of the present invention may be applied to a computer terminal or various mobile devices, and a schematic structural diagram of the pilot signal sending apparatus is shown in fig. 4, and specifically includes:
a mapping unit 201, configured to map a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
a sending unit 202, configured to send the set of subcarriers to which pilot signals have been mapped to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
the pilot signal sending device provided by the embodiment of the invention maps the pre-generated pilot signal to the target subcarrier in the preset subcarrier set; transmitting the set of subcarriers mapped with pilot signals to a terminal; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence. The pilot signal sending method provided by the invention can be used for generating the pilot signal by applying the ZC sequence or performing discrete Fourier transform on the pseudo-noise sequence to generate the pilot signal, thereby reducing the PAPR and improving the accuracy of channel estimation.
the pilot signal transmitting apparatus provided in the embodiment of the present invention further includes:
A first obtaining unit, configured to obtain preset pilot configuration information, where the pilot configuration information includes a cell identification number, a number of subcarriers, and a timeslot number of each downlink timeslot;
the first generating unit is used for calculating the CRS configuration information by applying a preset first pilot signal generating formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,Is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsIs a number of the time slot and is,is cell identity, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
the pilot signal transmitting apparatus provided in the embodiment of the present invention further includes:
A second obtaining unit, configured to obtain preset pilot configuration information, where the pilot configuration information includes a cell identification number, the number of subcarriers, and a timeslot number of each downlink timeslot;
The second generating unit is used for calculating the pilot configuration information by applying a preset second pilot signal generating formula to obtain a pilot signal;
The second pilot signal generation formula is:
Wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,Is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c), q is the root of a ZC sequence, nsis the time slot number of the downlink time slot,Is cell identity, xqAnd (m) is a ZC sequence carrying a time slot number and a cell identification number.
the pilot signal transmitting apparatus provided in the embodiment of the present invention further includes:
The third generating unit is used for generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generating formula;
a fourth generating unit, configured to obtain a pseudo noise sequence according to the pseudo noise sequence initialization identifier, calculate the pseudo noise sequence by using a preset third pilot signal generation formula to obtain an initial pilot signal, and perform discrete fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
Wherein N isCrsSeqc is the number of sampling points and the pseudo noise sequence;
the pseudo noise sequence initialization identifier generation formula is as follows:
or, it is:
wherein, cinitinitializing an identification for the pseudo-noise sequence, nsIs the slot number, l is the OFDM symbol number,Is a cell identification number.
in the pilot signal transmitting apparatus provided in the embodiment of the present invention, the mapping unit includes:
an obtaining subunit, configured to obtain a pre-configured subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
A determining subunit, configured to determine subcarrier positions corresponding to each pilot sequence in the pilot signal, and determine subcarriers at each subcarrier position as target subcarriers;
And the mapping subunit is used for mapping each pilot frequency sequence to the corresponding target subcarrier.
The embodiment of the invention also provides a pilot signal sending device, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps:
mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
transmitting the set of subcarriers to which the pilot signal has been mapped to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
In the pilot signal transmitting device provided in the embodiment of the present invention, the processor is further configured to implement the following steps when executing a program:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the pilot configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,is the number of sub-carriers,Is less thanthe maximum number of the prime numbers of (c),nsis the slot number, q is the root of the ZC sequence,Is cell identity, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
in the pilot signal transmitting device provided in the embodiment of the present invention, the processor is further configured to implement the following steps when executing a program:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
the second pilot signal generation formula is:
Wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,is the number of sub-carriers,Is less thanthe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsis the time slot number of the downlink time slot,identify for a cell，xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
In the pilot signal transmitting device provided in the embodiment of the present invention, the processor is further configured to implement the following steps when executing a program:
Generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
wherein N isCrsSeqC is the number of sampling points and the pseudo noise sequence;
the pseudo noise sequence initialization identifier generation formula is as follows:
or, it is:
wherein, cinitinitializing an identification for the pseudo-noise sequence, nsIs the slot number, l is the OFDM symbol number,Is a cell identification number.
in the pilot signal transmitting device provided in the embodiment of the present invention, the processor is further configured to implement the following steps when executing a program:
acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
and mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
the embodiment of the invention also provides a storage medium, which comprises a stored instruction, wherein when the instruction runs, the device where the storage medium is located is controlled to execute the pilot signal sending method.
An electronic device is provided in an embodiment of the present invention, and the structural diagram of the electronic device is shown in fig. 5, which specifically includes a memory 301 and one or more instructions 302, where the one or more instructions 302 are stored in the memory 301 and configured to be executed by one or more processors 303 to perform the following operations for the one or more instructions 302:
mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
Transmitting the set of subcarriers mapped with pilot signals to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
An embodiment of the present invention further provides a gateway station, a schematic structural diagram of which is shown in fig. 6, and specifically includes:
a processor 401, configured to map a pre-generated pilot signal to a target subcarrier in a preset subcarrier set; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence;
Communication circuitry 402 to transmit the set of subcarriers onto which the pilot signal has been mapped to a terminal.
it should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
for convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
from the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The foregoing detailed description is directed to a pilot signal sending method and related devices provided by the present invention, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the descriptions of the foregoing embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (13)
1. a method for transmitting a pilot signal, comprising:
mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
Transmitting the set of subcarriers to which the pilot signal has been mapped to a terminal;
the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
2. the method as claimed in claim 1, wherein the process of generating the pilot signal according to the ZC sequence comprises:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
calculating the pilot configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
Wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,Is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c),nsIs the slot number, q is the root of the ZC sequence,is a cell identification number, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
3. The method as claimed in claim 1, wherein the process of generating the pilot signal according to the ZC sequence comprises:
acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
The second pilot signal generation formula is:
wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,is the number of sub-carriers,is less thanThe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsis the time slot number of the downlink time slot,is a cell identification number, xqand (m) is a ZC sequence carrying a time slot number and a cell identification number.
4. The method of claim 1, wherein performing a discrete fourier transform on the pseudo-noise sequence to generate the pilot signal comprises:
Generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
wherein N isCrsSeqc is the number of sampling points and the pseudo noise sequence;
the pseudo noise sequence initialization identifier generation formula is as follows:
or, it is:
wherein, cinitInitializing an identification for the pseudo-noise sequence, nsis the slot number, l is the OFDM symbol number,is a cell identification number.
5. the method of claim 1, wherein the mapping the pre-generated pilot signal to a target subcarrier in a preset subcarrier set comprises:
Acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
And mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
6. a pilot signal transmission apparatus, comprising a processor, a memory, and a program stored on the memory and executable on the processor, wherein the processor executes the program to perform the steps of:
mapping a pre-generated pilot signal to a target subcarrier in a preset subcarrier set;
Transmitting the set of subcarriers to which the pilot signal has been mapped to a terminal;
The pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence.
7. the apparatus of claim 6, wherein the processor when executing the program is further configured to perform the steps of:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset first pilot signal generation formula to obtain a pilot signal; the first pilot signal generation formula is:
wherein the content of the first and second substances,In the case of a pilot signal, the pilot signal,is the number of sub-carriers,is less thanthe maximum number of the prime numbers of (c),nsis the slot number, q is the root of the ZC sequence,Is a cell identification number, xq(m) is a carry timeslota ZC sequence numbered with the cell identification number.
8. The apparatus of claim 6, wherein the processor when executing the program is further configured to perform the steps of:
Acquiring preset pilot configuration information, wherein the pilot configuration information comprises a cell identification number, the number of subcarriers and a time slot number of each downlink time slot;
Calculating the pilot configuration information by using a preset second pilot signal generation formula to obtain a pilot signal;
the second pilot signal generation formula is:
wherein the content of the first and second substances,in the case of a pilot signal, the pilot signal,Is the number of sub-carriers,is less thanThe maximum number of the prime numbers of (c),q is the root of a ZC sequence, nsis the time slot number of the downlink time slot,is a cell identification number, xqAnd (m) is a ZC sequence carrying a time slot number and a cell identification number.
9. The apparatus of claim 6, wherein the processor when executing the program is further configured to perform the steps of:
generating a pseudo noise sequence initialization identifier according to a preset pseudo noise sequence initialization identifier generation formula;
obtaining a pseudo noise sequence according to the pseudo noise sequence initialization identification, calculating the pseudo noise sequence by applying a preset third pilot signal generation formula to obtain an initial pilot signal, and performing discrete Fourier transform on the initial pilot signal according to a preset number of sampling points to obtain a pilot signal; the third pilot signal generation formula is:
wherein N isCrsSeqC is the number of sampling points and the pseudo noise sequence;
the pseudo noise sequence initialization identifier generation formula is as follows:
Or, it is:
wherein, cinitinitializing an identification for the pseudo-noise sequence, nsis the slot number, l is the OFDM symbol number,Is a cell identification number.
10. The apparatus of claim 6, wherein the processor when executing the program is further configured to perform the steps of:
Acquiring a pre-constructed subcarrier set; the set of subcarriers comprises a plurality of subcarriers;
determining subcarrier positions respectively corresponding to each pilot sequence in the pilot signals, and determining subcarriers at the subcarrier positions as target subcarriers;
and mapping each pilot frequency sequence to a target subcarrier corresponding to the pilot frequency sequence.
11. a storage medium, comprising stored instructions, wherein the instructions, when executed, control a device on which the storage medium is located to perform the pilot signal transmission method according to any one of claims 1 to 5.
12. an electronic device comprising a memory and one or more instructions, wherein the one or more instructions are stored in the memory and configured to be executed by the one or more processors to perform the pilot signal transmission method of any one of claims 1-5.
13. a gateway station, comprising:
The processor is used for mapping the pre-generated pilot signal to a target subcarrier in a preset subcarrier set; the pilot signal is generated according to a ZC sequence or generated by performing discrete Fourier transform on a pseudo-noise sequence;
communication circuitry to transmit the set of subcarriers to which the pilot signal has been mapped to a terminal.
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