CN117220733A - Uplink access synchronization signal transmission method, device, equipment and storage medium - Google Patents
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Abstract
The application discloses a method, a device, equipment and a storage medium for transmitting uplink access synchronous signals, and belongs to the technical field of communication. The uplink access synchronization signal transmission method comprises the following steps: receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix; generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information; determining a target uplink access synchronizing signal according to the precoding matrix and the uplink access synchronizing signal frequency domain sequence; and sending the target uplink access synchronous signal to the management station equipment. The application improves the reliability of the access synchronizing signal and the distinguishing degree between the access signals of other users by pre-coding the uplink access synchronizing signal, and can meet the performance requirements of low time delay and multi-user communication in industrial scenes.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and apparatus for transmitting an uplink access synchronization signal, a terminal station device, and a computer readable storage medium.
Background
In the field of communication technology, in a wireless communication protocol of the TDD (Time Division Duplex ) type and a conventional signal transmission scheme, precoding on the terminal station side is performed at a data traffic stage after access is completed. This is because the existing communication protocol itself is difficult to effectively pre-encode the access synchronization signal due to its design, and cannot distinguish the channels of the downlink multiple antennas.
Specifically, the existing communication protocol itself is designed for reasons including: LTE (Long Term Evolution ) and NR (New Radio) have only PSS (primary synchronization signal)/SSS (downlink synchronization signal) that occupy part of subcarriers instead of full bandwidth before access can be measured, and if the frequency domain positions of the PRACH (random access physical channel) and PSS/SSS are configured to be inconsistent, the channel at the PRACH cannot be estimated, and the PSS/SSS also has no multi-antenna multiplexing mechanism, so that the downlink multi-antenna channels cannot be distinguished. Therefore, in an industrial scenario with low delay and multi-user requirements for uplink access synchronization, it is difficult for the existing wireless communication uplink access synchronization signal transmission scheme to meet the high performance requirements in the industrial scenario.
Disclosure of Invention
The application mainly aims to provide an uplink access synchronous signal transmission method, an uplink access synchronous signal transmission device, terminal station equipment and a computer readable storage medium, which aim to meet the performance requirements of low-delay and multi-user communication in an industrial scene.
In order to achieve the above object, the present application provides an uplink access synchronization signal transmission method, which is applied to a terminal station device, and the uplink access synchronization signal transmission method includes the following steps:
receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix;
generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
determining a target uplink access synchronizing signal according to the precoding matrix and the uplink access synchronizing signal frequency domain sequence;
and sending the target uplink access synchronous signal to the management station equipment.
Optionally, the step of performing channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix includes:
performing channel estimation on the downlink reference signal to obtain frequency domain channel response matrixes corresponding to the data subcarriers respectively;
And determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix.
Optionally, the step of performing channel estimation on the downlink reference signal to obtain a frequency domain channel response matrix corresponding to each data subcarrier respectively includes:
determining the number of antenna ports of the management station equipment and the number of antenna ports of the terminal station equipment according to the antenna multiplexing mode in the system configuration information;
and constructing a frequency domain channel response matrix according to the frequency domain channel response of each data subcarrier in the downlink reference signal, wherein the number of rows of the frequency domain channel response matrix is the number of antenna ports of the management station, and the number of columns of the frequency domain channel response matrix is the number of antenna ports of the terminal station.
Optionally, the step of determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix includes:
when the number of matrix conditions of the frequency domain channel response matrix is not greater than a preset number, setting the value of a preset diagonal loading factor to be 0;
when the number of the matrix conditions is larger than the preset number, matrix diagonal elements corresponding to the frequency domain channel response matrix are obtained, and the value of the diagonal loading factor is set to be the product of a preset coefficient and a standard deviation function of the matrix diagonal elements;
And inputting the frequency domain channel response matrix, the diagonal loading factor and a preset unit diagonal matrix into a preset precoding function, and outputting a corresponding precoding matrix.
Optionally, the step of determining the target uplink access synchronization signal according to the precoding matrix and the uplink access synchronization signal frequency domain sequence includes:
expanding frequency domain data corresponding to each data subcarrier in the uplink access synchronizing signal frequency domain sequence into column vectors respectively;
calculating the product of each column vector and a corresponding precoding matrix to obtain multi-antenna frequency domain data corresponding to each data subcarrier;
and determining a target uplink access synchronizing signal corresponding to the terminal station equipment according to each multi-antenna frequency domain data.
Optionally, the step of determining the target uplink access synchronization signal corresponding to the terminal station device according to each multi-antenna frequency domain data includes:
performing power normalization processing on the multi-antenna frequency domain data to obtain target frequency domain data;
performing time domain transformation on the target frequency domain data to obtain target time domain data;
and according to the system configuration information, inserting a cyclic prefix and a protection period into the target time domain data to obtain a target uplink access synchronous signal.
Optionally, the step of sending the target uplink access synchronization signal to the management station device includes:
inserting the target uplink access synchronizing signal into a frame structure of a signal to be transmitted according to the position of the uplink access synchronizing signal in the frame structure in the system configuration information;
and sending the signal to be sent to the management station equipment.
In addition, in order to achieve the above object, the present application further provides an uplink access synchronization signal transmission device, where the uplink access synchronization signal transmission device includes:
the system comprises an estimation precoding module, a precoding matrix and a channel estimation module, wherein the estimation precoding module is used for receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain the precoding matrix;
the sequence generation module is used for generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
the signal determining module is used for determining a target uplink access synchronous signal according to the precoding matrix and the uplink access synchronous signal frequency domain sequence;
and the signal sending module is used for sending the target uplink access synchronous signal to the management station equipment.
In addition, to achieve the above object, the present application also provides an end station apparatus including: the uplink access synchronization signal transmission method comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the computer program realizes the steps of the uplink access synchronization signal transmission method when being executed by the processor.
In addition, to achieve the above object, the present application also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the uplink access synchronization signal transmission method as described above.
The application provides an uplink access synchronizing signal transmission method, a device, terminal station equipment and a computer readable storage medium, which overcome the technical defect that signals of downlink multiple antennas cannot be measured before uplink access synchronizing signals are transmitted in the prior art.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only a part of the embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for transmitting uplink access synchronization signals according to an embodiment of the present application;
fig. 2 is a schematic diagram of a frame structure related to an uplink access synchronization signal transmission method according to an embodiment of the present application;
fig. 3 is a schematic diagram of the positions of a CP and a GP in an uplink access synchronization signal transmission method according to an embodiment of the present application;
fig. 4 is a schematic diagram of an uplink access synchronization signal transmission flow using channel reciprocity according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a system error rate-SNR performance curve according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an uplink access synchronization signal transmission device according to an embodiment of the present application;
Fig. 7 is a schematic structural diagram of an end station device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that embodiments of the application may be practiced in other embodiments, which depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present application with unnecessary detail.
It should be noted that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of an embodiment of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
In the field of communication technology, two main types of wireless communication network protocols currently include 802.11 series wireless local area networks dominated by Institute of Electrical and Electronics Engineers (IEEE), and mobile communication long term evolution (Long Term Evolution, LTE) and 5G New Radio, NR) systems dominated by the third generation partnership project (3rd Generation Partnership Project,3GPP), which both support TDD mode, and also support application of precoding technology by terminal stations in part of the transmission flow, for example, NR protocol has precoding codebook design for uplink data traffic transmission, and wireless local area network protocol supports beamforming mechanism.
The pre-coding of the terminal station equipment side in the existing wireless protocol and the technical scheme is carried out in the data service stage after the access is completed, and the technical scheme for pre-coding the access synchronous signal is lacking, so that the adverse effect caused by multipath effect cannot be dealt with. This is because, although the existing protocol does not completely limit the transmission process of the uplink access synchronization signal, on one hand, it is difficult to effectively precode the access synchronization signal due to the protocol design, and on the other hand, the access failure rate to some extent is acceptable for the general commercial mobile communication and indoor communication scenarios, and the requirement of overcoming the multipath effect is not met in such scenarios. However, for the industrial scenario that the uplink access synchronization has low time delay and multiple users, the existing wireless communication uplink access synchronization technology is insufficient to meet the high performance requirement in the industrial scenario. And the TDD type wireless communication system has uplink and downlink channel reciprocity, on the basis of which the influence of multipath effect on the transmission signal can be improved by open-loop channel estimation and originating precoding.
Based on the above, the embodiments of the present application provide a method, an apparatus, a terminal station device, and a computer readable storage medium for transmitting uplink access synchronization signals, which overcome the technical defect that in the prior art, signals of downlink multiple antennas cannot be measured before uplink access synchronization signals are transmitted, in the uplink access synchronization signal transmission method, firstly, downlink reference signals transmitted by a management station device are received, channel estimation and precoding are performed according to the downlink reference signals, a precoding matrix is obtained, then, based on preset system configuration information, an uplink access synchronization signal frequency domain sequence is generated, then, a target uplink access synchronization signal is determined according to the precoding matrix and the uplink access synchronization signal frequency domain sequence, and finally, the target uplink access synchronization signal is transmitted to the management station device.
The method, device, equipment and computer readable storage medium for transmitting uplink access synchronization signals provided by the embodiment of the application are specifically described by the following embodiments, and the uplink access synchronization signal transmission method in the embodiment of the application is described first.
Referring to fig. 1, fig. 1 is a flow chart of an uplink access synchronization signal transmission method according to an embodiment of the present application, where the uplink access synchronization signal transmission method may be applied to a terminal station device, as shown in fig. 1, and the uplink access synchronization signal transmission method provided in the embodiment includes steps S10 to S40.
Step S10, receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix;
the present embodiment is applied to an end station device, which may be also referred to as an end station, a user device, a mobile station, a mobile terminal, or the like. The terminal station device may be a mobile phone, a tablet computer, a computer with a wireless transceiver function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned operation, a wireless terminal in teleoperation, a wireless terminal in smart grid, a wireless terminal in transportation security, a wireless terminal in smart city, a wireless terminal in smart home, or the like. The end station device may receive a downlink signal (including a downlink reference signal) or a sidelink signal and transmit an uplink signal (including an uplink access synchronization signal) or a sidelink signal. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the terminal station equipment.
In addition, the management station device may be a base station, an evolved base station, a transmission and reception point, a next generation base station in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; the present application may also be a module or unit that performs a function of a base station part, for example, a Central Unit (CU) or a Distributed Unit (DU). The management station device may transmit downlink signals (including downlink reference signals) and receive uplink signals (including access-synchronized uplink signals). The embodiment of the application is not limited to the specific technology and the specific equipment form adopted by the management station equipment.
As an example, the management station device in this embodiment transmits a downlink reference signal to the terminal station device according to a preset period, so that the terminal station device performs measurement and performs channel estimation.
In a possible embodiment, before step S10, the uplink access synchronization signal transmission method further includes obtaining system configuration information input by a user, where before receiving a downlink reference signal sent by a management station device, a worker needs to configure certain system configuration information on a terminal station device according to an actual situation and an actual requirement of the device, where the system configuration information includes information such as a position of the downlink reference signal in a frame structure, a multi-antenna multiplexing mode, and the like, and then receives the downlink reference signal after the system configuration is completed.
Further, in some possible embodiments, the step of performing channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix may include:
step S11, carrying out channel estimation on the downlink reference signals to obtain frequency domain channel response matrixes corresponding to the data subcarriers respectively;
in the embodiment of the application, a corresponding frequency domain channel response matrix can be constructed according to the response condition of each antenna in the multiple antennas in the downlink reference signal, and the frequency domain channel response matrix is used for representing the frequency domain response condition of each channel in the multiple antenna system.
In some possible embodiments, the step S11 may include:
step S111, determining the number of antenna ports of the management station equipment and the number of antenna ports of the terminal station equipment according to the antenna multiplexing mode in the system configuration information;
step S112, a frequency domain channel response matrix is constructed according to the frequency domain channel response of each data subcarrier in the downlink reference signal, wherein the number of rows of the frequency domain channel response matrix is the number of antenna ports of the management station, and the number of columns of the frequency domain channel response matrix is the number of antenna ports of the terminal station.
In the embodiment of the present application, the antenna multiplexing mode refers to a multi-antenna multiplexing mode of a downlink reference signal, which is used to represent a multiplexing technology used when a management station transmits the downlink reference signal by using multiple antenna ports at the same time and frequency resource block, for example, the antenna multiplexing mode may be FDM (frequency division multiplexing) or CDM (code division multiplexing), and is used for a terminal station to estimate channels of antenna ports of different management stations when receiving the reference signal according to the antenna multiplexing mode.
In a possible embodiment, the signal transmission mechanism of the uplink access synchronization signal is a TDD wireless communication mechanism, including a downlink frame portion and an uplink frame portion, where the overall frame structure is shown in fig. 2, the downlink frame includes a DRS (Dedicated Reference Signal, downlink reference signal), the DRS occupies 1 OFDM (Orthogonal Frequency Division Multiplexing ) symbol in the time domain, the frequency domain occupies a bandwidth, and multiple transmitting antenna ports multiplex the same time-frequency location resource by means of CDM (code division multiplexing ); the uplink frame contains USS (uplink synchronization signal), occupies 1 OFDM symbol in the time domain, and is multi-user uplink multiplexing, wherein DTCH refers to downlink transmission channel, UTCH refers to uplink transmission channel, URS refers to uplink reference signal. In the embodiment of the application, the downlink receiving multi-antenna configuration is 2-transmit and 2-receive, the number of the antenna ports of the corresponding management station equipment is 2, and the number of the antenna ports of the terminal station equipment is also 2.
In the case of the antenna multiplexing method in the embodiment of the application, the constructed frequency domain channel response matrix is a 2x2 frequency domain channel response matrix with row and column numbers of 2 for each data subcarrier i
Step S12, determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix.
In the embodiment of the application, after the frequency domain response matrix of the data subcarrier is obtained, a zero forcing algorithm based on diagonal loading can be adopted to calculate the precoding matrix corresponding to the data subcarrier, and the precoding matrix is used for precoding the generated uplink access synchronizing signal frequency domain sequence so as to distinguish the uplink access synchronizing signals of a plurality of users, thereby ensuring that the precoding matrix is used for high-performance communication requirements of low delay and multiple users in certain industrial environments.
In some possible embodiments, the step S12 may include:
step S121, when the number of matrix conditions of the frequency domain channel response matrix is not greater than a preset number, setting the value of a preset diagonal loading factor to be 0;
step S122, when the number of matrix conditions is greater than the preset number, matrix diagonal elements corresponding to the frequency domain channel response matrix are obtained, and the value of the diagonal loading factor is set as the product of a preset coefficient and a standard deviation function of the matrix diagonal elements;
Step S123, inputting the frequency domain channel response matrix, the diagonal loading factor and a preset unit diagonal matrix into a preset precoding function, and outputting a corresponding precoding matrix.
In the embodiment of the application, the precoding matrix corresponding to the data subcarrier i is calculated by mainly adopting a zero forcing algorithm based on diagonal loading. Illustratively, the expression of the precoding function is: wherein (1)>The precoding matrix corresponding to subcarrier i may also be referred to as a precoding sequence matrix, +.>A frequency domain channel response matrix corresponding to a subcarrier I, wherein I is N T Row N R Unit diagonal array of columns, N T To manage the station antenna port number, N R For the number of end station antenna ports, lambda is the diagonal loading factor。
Specifically, the diagonal loading factor lambda is valued according to the frequency domain channel response matrixIs determined by the matrix condition number of (2), wherein, when the frequency domain channel response matrix is +.>When the number of matrix conditions is not greater than a preset number (e.g., 100), the value of the diagonal loading factor λ may be set to 0; when the frequency domain channel response matrix->When the number of matrix conditions is greater than a preset number (for example, 100), the value of the diagonal loading factor lambda is obtained by firstly obtaining the matrix diagonal elements corresponding to the frequency domain channel response matrix, and then setting the value of the diagonal loading factor as the product of the preset coefficient and the standard deviation function of the matrix diagonal elements.
Illustratively, the value function of the diagonal loading factor λ is as follows:
wherein std represents a standard deviation function, diag represents diagonal elements of the acquisition matrix, cond represents the condition number of the acquisition matrix, and 3.25 is a preset coefficient.
Step S20, generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
the system configuration information in the embodiment of the application comprises specific parameters corresponding to the uplink access synchronizing signal frequency domain sequence which are set by the user according to the requirement of the user and are used for generating the uplink access synchronizing signal frequency domain sequence. Specifically, the parameters at least include a root value, a sequence length, a resource mapping manner, and the like in the uplink synchronization signal.
And step S30, determining a target uplink access synchronous signal according to the precoding matrix and the uplink access synchronous signal frequency domain sequence.
In the embodiment of the application, the generated uplink access synchronizing signal frequency domain sequence is subjected to pre-coding treatment through the pre-coding matrix which is determined, so that the target uplink access synchronizing signal is obtained, and because the target uplink access synchronizing signal is determined according to the system configuration information of the corresponding terminal station equipment and the independent pre-coding matrix, the uplink access synchronizing signal of the user is well distinguished from the uplink access synchronizing signals of other users, thereby realizing high-performance single-user and multi-user access synchronization.
In some possible embodiments, the step S30 may include:
step S31, expanding frequency domain data corresponding to each data subcarrier in the uplink access synchronous signal frequency domain sequence into column vectors respectively;
step S32, calculating the product of each column vector and the corresponding precoding matrix to obtain multi-antenna frequency domain data corresponding to each data subcarrier;
step S33, determining a target uplink access synchronization signal corresponding to the terminal station equipment according to each multi-antenna frequency domain data.
In the embodiment of the application, the obtained numerical value on each data subcarrier in the uplink access synchronizing signal frequency domain sequence is needed to be firstlyAnd (3) copying and expanding to obtain corresponding column vectors so as to multiply the column vectors with a precoding matrix, thereby obtaining multi-antenna frequency domain data corresponding to digital subcarriers respectively, finally, aggregating the multi-antenna frequency domain data, performing proper normalization processing, performing time domain transformation, adding a CP (Cyclic Prefix) structure and a GP (Guard Period) structure, and finally obtaining a target uplink access synchronization signal corresponding to the terminal station equipment.
Illustratively, steps S31 through S32 include: determining the length N of the column vector according to the number of the antenna ports of the management station equipment T Sub-dividing the dataValues on carrier waveCopying to obtain a length N T Is of the column vector of (2)And then the column vector and the precoding matrix are +.>Multiplying to obtain precoded multi-antenna frequency domain data on each data subcarrier>Wherein the multi-antenna frequency domain data +.>The expression of (2) is: />Wherein,is a precoding matrix>Is a value on a data subcarrier.
In some possible embodiments, step S33 may include:
step S331, performing power normalization processing on the multi-antenna frequency domain data to obtain target frequency domain data;
step S332, performing time domain transformation on the target frequency domain data to obtain target time domain data;
step S333, according to the system configuration information, inserts a cyclic prefix and a protection period into the target time domain data, and obtains a target uplink access synchronization signal.
In the technical scheme of the embodiment of the application, the obtained multi-antenna frequency domain data is subjected to power normalization processing firstly, wherein the power normalization processing comprises adding a power normalization factor, and the power normalization processing aims to enable different modulation modes (or all mapping modes) to be mapped to relative values in the same value range so as to facilitate comparison of system performance among different antenna frequency data.
After the power normalization process, the obtained target frequency domain data is converted from the frequency domain to the time domain, so as to obtain the target time domain, so as to generate a corresponding uplink access synchronization signal and send the corresponding uplink access synchronization signal to the management station device, referring to fig. 3, and further according to the user data signal in the generated target time domain data, which is related to the relevant parameters of the cyclic prefix CP and the guard period GP in the system configuration informationThe CP and GP are inserted at both ends of the same, and the CP and GP are used as the prefix ends repeated in the OFDM wireless system in the technical scheme of the present application to combat the influence of multipath propagation.
Specifically, the guard period is to avoid inter-symbol interference, and may be inserted in the form of a cyclic prefix between OFDM symbols. The guard period is that the delay spread component of the previous symbol arrives before the start of the next symbol providing a time window. The guard period may be a period of discontinuous transmission or any other transmission. The length (Tg) of the guard period is typically greater than the maximum delay on the wireless channel. In addition, a cyclic prefix may be inserted into the CP in the guard period to reduce ICI (Inter-Channel Interference ). The sample points after each OFDM symbol are copied to the front of the OFDM symbol. This ensures that the number of waveform periods included in the delayed copies of the OFDM symbol is an integer number of FFT periods, which ensures orthogonality of the subcarriers. Copying the end of the payload and transmitting as a cyclic prefix ensures that there is a "cyclic" convolution between the transmitted signal and the channel response.
On the basis of the above embodiments, referring to fig. 4, an embodiment of the present application provides a schematic uplink access synchronization signal transmission flow using channel reciprocity. Firstly, step 200, starting terminal station equipment; step 201, receiving a downlink reference signal through terminal station equipment, and step 202, performing channel estimation by using the received downlink reference signal through the terminal station equipment to obtain a frequency domain channel response matrix; step 203, calculating a precoding matrix on each subcarrier through a frequency domain channel response matrix; step 204, generating an uplink access synchronizing signal frequency domain sequence based on system configuration information; step 205, multiplying the precoding matrix with the uplink access synchronization signal frequency domain sequence to obtain a precoded frequency domain signal; step 206, transforming the pre-coded frequency domain signal into the time domain; step 207, adding CP and GP in the time domain signal and transmitting the obtained target uplink access synchronization signal to the management station device via the terminal station device; step 208, the flow ends.
And step S40, the target uplink access synchronous signal is sent to the management station equipment.
After the precoded target uplink access synchronization signal is obtained, the position of the target uplink access synchronization signal in the frame structure needs to be further determined, so as to determine the transmission mode of the target uplink access synchronization signal.
In some possible embodiments, the step S40 includes:
step S41, inserting the target uplink access synchronous signal into a frame structure of a signal to be transmitted according to the position of the uplink access synchronous signal in the frame structure in the system configuration information;
and step S42, the signal to be sent is sent to the management station equipment.
In the embodiment of the application, the target position of the target uplink access synchronization signal in the frame structure is determined according to the position of the uplink reference signal in the frame structure, which is preconfigured by a worker in the system configuration information. After determining a target position corresponding to a target uplink access synchronizing signal in a frame structure, inserting the target uplink access synchronizing signal into the target position of the frame structure, and then sending a signal to be sent comprising the uplink access synchronizing signal to a management station device so as to realize that the target uplink access synchronizing signal after precoding is sent to the management station device.
In a feasible embodiment, the method for precoding the uplink access synchronization signal is beneficial to the performance requirements of higher reliability, lower delay, more user access under the same time-frequency resource and the like in an industrial scene. As shown in FIG. 5, the simulation result is shown in FIG. 5, the abscissa is the signal-to-noise ratio, the ordinate is the error detection rate, after the precoding mode in the embodiment of the application is adopted and not adopted respectively by a single user and a 16 user (multi-user), the single user and the 16 user are configured based on multiple antennas of 2Tx2R (namely 2 transmission and 2 reception), when the signal-to-noise ratio of the uplink synchronous access signal received after passing through a TDL (Tapped Delay Line ) channel model is a-15-10 dB interval, the comparison of the simulation error detection rate statistical curve can be known, and at the same error detection rate, the signal-to-noise ratio (Eb/No (dB)) required by the uplink access synchronous signal transmission method of the embodiment of the application is lower than that required by the uplink access synchronous signal transmission method without the embodiment of the application, so the processing capacity of the signal transmission system is stronger, the performance of the signal transmission system is better, and the signal transmission requirement of the signal-to-noise ratio range is wider.
The technical scheme of the embodiment of the application provides an uplink access synchronous signal transmission method by utilizing channel reciprocity by utilizing the certainty of an industrial wireless private network protocol, namely terminal station equipment firstly measures a downlink reference signal periodically transmitted by a management station and carries out channel estimation, and then uses channel information obtained by estimation to pre-encode and then transmit the uplink access synchronous signal, thereby meeting the performance requirements of higher reliability and more simultaneous access in industrial scenes.
In addition, an embodiment of the present application further provides an uplink access synchronization signal transmission device, referring to fig. 6, fig. 6 is a schematic structural diagram of an uplink access synchronization signal transmission device according to an embodiment of the present application, as shown in fig. 6, in this embodiment, the uplink access synchronization signal transmission device includes: an estimation pre-coding module 10, a sequence generation module 20, a signal determination module 30 and a signal transmission module 40.
The estimating and precoding module 10 is configured to receive a downlink reference signal sent by a management station device, and perform channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix;
the sequence generating module 20 is configured to generate an uplink access synchronization signal frequency domain sequence based on preset system configuration information;
The signal determining module 30 is configured to determine a target uplink access synchronization signal according to the precoding matrix and the uplink access synchronization signal frequency domain sequence;
the signal sending module 40 is configured to send the target uplink access synchronization signal to the management station device.
In some possible embodiments, the estimation pre-coding module 10 is further configured to perform channel estimation on the downlink reference signal to obtain a frequency domain channel response matrix corresponding to each data subcarrier; and determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix.
In some possible embodiments, the estimation pre-coding module 10 is further configured to determine, according to an antenna multiplexing manner in the system configuration information, the number of antenna ports of the management station device and the number of antenna ports of the terminal station device; and constructing a frequency domain channel response matrix according to the frequency domain channel response of each data subcarrier in the downlink reference signal, wherein the number of rows of the frequency domain channel response matrix is the number of antenna ports of the management station, and the number of columns of the frequency domain channel response matrix is the number of antenna ports of the terminal station.
In some possible embodiments, the estimation pre-coding module 10 is further configured to set a value of a preset diagonal loading factor to 0 when a matrix condition number of the frequency domain channel response matrix is not greater than a preset number; when the number of the matrix conditions is larger than the preset number, matrix diagonal elements corresponding to the frequency domain channel response matrix are obtained, and the value of the diagonal loading factor is set to be the product of a preset coefficient and a standard deviation function of the matrix diagonal elements; and inputting the frequency domain channel response matrix, the diagonal loading factor and a preset unit diagonal matrix into a preset precoding function, and outputting a corresponding precoding matrix.
In some possible embodiments, the signal determining module 30 is further configured to expand the frequency domain data corresponding to each data subcarrier in the uplink access synchronization signal frequency domain sequence into a column vector respectively; calculating the product of each column vector and a corresponding precoding matrix to obtain multi-antenna frequency domain data corresponding to each data subcarrier; and determining a target uplink access synchronizing signal corresponding to the terminal station equipment according to each multi-antenna frequency domain data.
In some possible embodiments, the signal determining module 30 is further configured to perform power normalization on the multi-antenna frequency domain data to obtain target frequency domain data; performing time domain transformation on the target frequency domain data to obtain target time domain data; and according to the system configuration information, inserting a cyclic prefix and a protection period into the target time domain data to obtain a target uplink access synchronous signal.
In some possible embodiments, the signal sending module 40 is further configured to insert the target uplink access synchronization signal into a frame structure of a signal to be sent according to a position of the uplink access synchronization signal in the frame structure in the system configuration information; and sending the signal to be sent to the management station equipment.
The uplink access synchronization signal transmission device provided in this embodiment and the uplink access synchronization signal transmission method provided in the foregoing embodiments belong to the same inventive concept, and technical details not described in detail in this embodiment can be seen in any of the foregoing embodiments, and this embodiment has the same beneficial effects as those of executing the uplink access synchronization signal transmission method.
In addition, the embodiment of the application also provides a terminal station device, the uplink access synchronization signal transmission method applied to the terminal station device can be executed by an uplink access synchronization signal transmission device, and the uplink access synchronization signal transmission device can be realized in a software and/or hardware mode and is integrated in the terminal station device. The terminal station device can be mobile devices such as mobile phones, notebooks, tablet computers and the like which can communicate with the network side.
Referring to fig. 7, fig. 7 is a schematic hardware structure of an end station device according to an embodiment of the present application. As shown in fig. 7, the terminal station apparatus may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 7 is not limiting of the end station apparatus and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 7, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and a computer program, where the computer program is an uplink access synchronization signal transmission program.
In the terminal station apparatus shown in fig. 7, the network interface 1004 is mainly used for data communication with other apparatuses; the user interface 1003 is mainly used for data interaction with a user; the processor 1001, the memory 1005 in the present embodiment may be provided in an end station apparatus which calls a computer program stored in the memory 1005 through the processor 1001 and performs the following operations:
receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix;
generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
determining a target uplink access synchronizing signal according to the precoding matrix and the uplink access synchronizing signal frequency domain sequence;
and sending the target uplink access synchronous signal to the management station equipment.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
Performing channel estimation on the downlink reference signal to obtain frequency domain channel response matrixes corresponding to the data subcarriers respectively;
and determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
determining the number of antenna ports of the management station equipment and the number of antenna ports of the terminal station equipment according to the antenna multiplexing mode in the system configuration information;
and constructing a frequency domain channel response matrix according to the frequency domain channel response of each data subcarrier in the downlink reference signal, wherein the number of rows of the frequency domain channel response matrix is the number of antenna ports of the management station, and the number of columns of the frequency domain channel response matrix is the number of antenna ports of the terminal station.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
when the number of matrix conditions of the frequency domain channel response matrix is not greater than a preset number, setting the value of a preset diagonal loading factor to be 0;
when the number of the matrix conditions is larger than the preset number, matrix diagonal elements corresponding to the frequency domain channel response matrix are obtained, and the value of the diagonal loading factor is set to be the product of a preset coefficient and a standard deviation function of the matrix diagonal elements;
And inputting the frequency domain channel response matrix, the diagonal loading factor and a preset unit diagonal matrix into a preset precoding function, and outputting a corresponding precoding matrix.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
expanding frequency domain data corresponding to each data subcarrier in the uplink access synchronizing signal frequency domain sequence into column vectors respectively;
calculating the product of each column vector and a corresponding precoding matrix to obtain multi-antenna frequency domain data corresponding to each data subcarrier;
and determining a target uplink access synchronizing signal corresponding to the terminal station equipment according to each multi-antenna frequency domain data.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
performing power normalization processing on the multi-antenna frequency domain data to obtain target frequency domain data;
performing time domain transformation on the target frequency domain data to obtain target time domain data;
and according to the system configuration information, inserting a cyclic prefix and a protection period into the target time domain data to obtain a target uplink access synchronous signal.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
inserting the target uplink access synchronizing signal into a frame structure of a signal to be transmitted according to the position of the uplink access synchronizing signal in the frame structure in the system configuration information;
and sending the signal to be sent to the management station equipment.
The terminal station device according to the present embodiment and the uplink access synchronization signal transmission method applied to the terminal station device according to the foregoing embodiment belong to the same inventive concept, and technical details not described in detail in the present embodiment can be seen in any of the foregoing embodiments, and the present embodiment has the same beneficial effects as those of executing the uplink access synchronization signal transmission method.
In addition, the embodiment of the application also provides a computer readable storage medium, which is applied to a computer, and the computer readable storage medium can be a nonvolatile computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the uplink access synchronization signal transmission method of any embodiment is realized.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
While the preferred embodiments of the present application have been described in detail, the embodiments of the present application are not limited to the above-described embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the embodiments of the present application, and these equivalent modifications or substitutions are included in the scope of the embodiments of the present application as defined in the appended claims.
Claims (10)
1. The uplink access synchronization signal transmission method is characterized by being applied to terminal station equipment, and comprises the following steps of:
receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix;
generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
determining a target uplink access synchronizing signal according to the precoding matrix and the uplink access synchronizing signal frequency domain sequence;
and sending the target uplink access synchronous signal to the management station equipment.
2. The uplink access synchronization signal transmission method according to claim 1, wherein the step of performing channel estimation and precoding according to the downlink reference signal to obtain a precoding matrix includes:
Performing channel estimation on the downlink reference signal to obtain frequency domain channel response matrixes corresponding to the data subcarriers respectively;
and determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix.
3. The method for transmitting uplink access synchronization signals according to claim 2, wherein the step of performing channel estimation on the downlink reference signals to obtain frequency domain channel response matrices respectively corresponding to the data subcarriers comprises:
determining the number of antenna ports of the management station equipment and the number of antenna ports of the terminal station equipment according to the antenna multiplexing mode in the system configuration information;
and constructing a frequency domain channel response matrix according to the frequency domain channel response of each data subcarrier in the downlink reference signal, wherein the number of rows of the frequency domain channel response matrix is the number of antenna ports of the management station, and the number of columns of the frequency domain channel response matrix is the number of antenna ports of the terminal station.
4. The uplink access synchronization signal transmission method according to claim 2, wherein the step of determining a precoding matrix corresponding to each data subcarrier according to each frequency domain channel response matrix comprises:
When the number of matrix conditions of the frequency domain channel response matrix is not greater than a preset number, setting the value of a preset diagonal loading factor to be 0;
when the number of the matrix conditions is larger than the preset number, matrix diagonal elements corresponding to the frequency domain channel response matrix are obtained, and the value of the diagonal loading factor is set to be the product of a preset coefficient and a standard deviation function of the matrix diagonal elements;
and inputting the frequency domain channel response matrix, the diagonal loading factor and a preset unit diagonal matrix into a preset precoding function, and outputting a corresponding precoding matrix.
5. The uplink access synchronization signal transmission method according to claim 1, wherein the step of determining a target uplink access synchronization signal according to the precoding matrix and the uplink access synchronization signal frequency domain sequence comprises:
expanding frequency domain data corresponding to each data subcarrier in the uplink access synchronizing signal frequency domain sequence into column vectors respectively;
calculating the product of each column vector and a corresponding precoding matrix to obtain multi-antenna frequency domain data corresponding to each data subcarrier;
and determining a target uplink access synchronizing signal corresponding to the terminal station equipment according to each multi-antenna frequency domain data.
6. The uplink access synchronization signal transmission method according to claim 5, wherein the step of determining the target uplink access synchronization signal corresponding to the terminal station device according to each of the multi-antenna frequency domain data comprises:
performing power normalization processing on the multi-antenna frequency domain data to obtain target frequency domain data;
performing time domain transformation on the target frequency domain data to obtain target time domain data;
and according to the system configuration information, inserting a cyclic prefix and a protection period into the target time domain data to obtain a target uplink access synchronous signal.
7. The uplink access synchronization signal transmission method according to claim 1, wherein the step of transmitting the target uplink access synchronization signal to the management station device includes:
inserting the target uplink access synchronizing signal into a frame structure of a signal to be transmitted according to the position of the uplink access synchronizing signal in the frame structure in the system configuration information;
and sending the signal to be sent to the management station equipment.
8. An uplink access synchronization signal transmission device, which is characterized in that the uplink access synchronization signal transmission device comprises:
The system comprises an estimation precoding module, a precoding matrix and a channel estimation module, wherein the estimation precoding module is used for receiving a downlink reference signal sent by management station equipment, and carrying out channel estimation and precoding according to the downlink reference signal to obtain the precoding matrix;
the sequence generation module is used for generating an uplink access synchronizing signal frequency domain sequence based on preset system configuration information;
the signal determining module is used for determining a target uplink access synchronous signal according to the precoding matrix and the uplink access synchronous signal frequency domain sequence;
and the signal sending module is used for sending the target uplink access synchronous signal to the management station equipment.
9. An end station device, the end station device comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the uplink access synchronization signal transmission method according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the uplink access synchronization signal transmission method according to any of claims 1 to 7.
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