CN116455717A - Signal transmitting method, signal receiving method, signal transmitting device and signal receiving device and related equipment - Google Patents

Signal transmitting method, signal receiving method, signal transmitting device and signal receiving device and related equipment Download PDF

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Publication number
CN116455717A
CN116455717A CN202210005026.XA CN202210005026A CN116455717A CN 116455717 A CN116455717 A CN 116455717A CN 202210005026 A CN202210005026 A CN 202210005026A CN 116455717 A CN116455717 A CN 116455717A
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China
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domain data
ofdm symbols
data corresponding
time domain
frequency domain
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刘杨
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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Priority to CN202210005026.XA priority Critical patent/CN116455717A/en
Publication of CN116455717A publication Critical patent/CN116455717A/en
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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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain

Abstract

The application provides a signal sending method, a signal receiving device and related equipment, wherein the signal sending method comprises the steps of obtaining time domain data corresponding to at least two identical Orthogonal Frequency Division Multiplexing (OFDM) symbols, and connecting the time domain data corresponding to the at least two identical OFDM symbols end to end; and transmitting the time domain data corresponding to at least two identical OFDM symbols. In the embodiment of the invention, by sending at least two identical OFDM symbols, and connecting the time domain data corresponding to the at least two identical OFDM symbols end to end, the data corresponding to the complete OFDM symbols can be received no matter where the receiving window is positioned, thereby solving the problem that the sending device and the receiving device are not in timing synchronization or the timing deviation exceeds the length of the cyclic prefix, so that the receiving device cannot receive the complete OFDM symbols sent by the sending device.

Description

Signal transmitting method, signal receiving method, signal transmitting device and signal receiving device and related equipment
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a signal sending method, a signal receiving device, and related devices.
Background
The orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is a high-speed transmission technique in a wireless environment, and is widely used in various digital transmission and wireless communication. Since radio frames are strictly defined by time in a wireless communication system, timing synchronization is of great importance for OFDM systems. However, timing synchronization bias or delay spread may cause Inter-symbol interference (Inter-Symbol Interference, ISI) and Inter-subcarrier interference (Inter-Carrier Interference, ICI) in OFDM systems.
In the prior art, in order to avoid the influence of timing synchronization deviation or delay spread to a certain extent, a Guard Period (GP) and a Cyclic Prefix (CP) are added between OFDM symbols, and an open-loop and closed-loop synchronization mechanism is designed in a wireless system, so as to dynamically adjust the timing deviation to make the timing deviation within the Cyclic Prefix range, thereby ensuring the normal operation of the wireless system. However, the following problems exist: if the transmitting device and the receiving device are not synchronized, or the timing deviation exceeds the length of the cyclic prefix, the receiving device cannot receive the complete OFDM symbol transmitted by the transmitting device.
Disclosure of Invention
The embodiment of the application provides a signal sending method, a signal receiving device and related equipment, which solve the problem that the receiving equipment cannot receive a complete OFDM symbol sent by the sending equipment because the sending equipment and the receiving equipment are not in timing synchronization or the timing deviation exceeds the length of a cyclic prefix.
In order to achieve the above objective, embodiments of the present application provide a signal sending method, a signal receiving method, a device and related equipment,
in a first aspect, an embodiment of the present application provides a signal sending method, which is applied to a sending device, including:
obtaining time domain data corresponding to at least two identical OFDM symbols, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end;
and transmitting the time domain data corresponding to the at least two same OFDM symbols.
In a second aspect, an embodiment of the present application provides a signal receiving method, which is applied to a receiving device, including:
at least partial time domain data corresponding to at least two identical OFDM symbols are received, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end.
In a third aspect, an embodiment of the present application provides a signal transmitting apparatus, including:
a first processor, configured to obtain time domain data corresponding to at least two identical OFDM symbols, where the time domain data corresponding to each of the at least two identical OFDM symbols are connected end to end;
and the first transceiver is used for transmitting the time domain data corresponding to the at least two same OFDM symbols.
In a fourth aspect, an embodiment of the present application provides a signal receiving apparatus, including:
and the second transceiver is used for receiving at least part of time domain data corresponding to at least two identical OFDM symbols, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end.
In a fifth aspect, an embodiment of the present invention further provides a communication device, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the processor is configured to read a program in the memory to implement the steps in the method according to the foregoing first aspect; or, as in the method of the second aspect described above.
In a sixth aspect, embodiments of the present invention further provide a readable storage medium storing a program, where the program when executed by a processor implements the steps of the method according to the first aspect, or implements the steps of the method according to the second aspect.
In the embodiment of the invention, by sending at least two identical OFDM symbols, and connecting the time domain data corresponding to the at least two identical OFDM symbols end to end, the data corresponding to the complete OFDM symbols can be received no matter where the receiving window is positioned, thereby solving the problem that the sending device and the receiving device are not in timing synchronization or the timing deviation exceeds the length of the cyclic prefix, so that the receiving device cannot receive the complete OFDM symbols sent by the sending device.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the following description will be given with reference to the accompanying drawings, which are only embodiments of the present application, and it is obvious to those skilled in the art that other drawings can be obtained from the listed drawings without inventive effort.
Fig. 1 is a schematic diagram of various timing deviations that may occur for an OFDM symbol
FIG. 2 is a block diagram of a network system to which embodiments of the present application are applicable;
fig. 3 is a schematic flow chart of a signaling method provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of time domain data obtained by phase shifting and inverse Fourier transforming three identical OFDM symbols S-1, S-2, S-3;
FIG. 5 is a schematic diagram of end-to-end time domain data corresponding to three identical OFDM symbols S-1, S-2, S-3;
fig. 6 is a flowchart of a signal receiving method provided in an embodiment of the present application;
fig. 7 is a schematic diagram of an OFDM symbol transceived by an embodiment of the present application;
fig. 8 is a schematic structural diagram of a signal transmission device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventors, are within the scope of the present application, based on the embodiments herein.
The background presented in this application is briefly described below. In the prior art, the orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology is widely applied to various digital transmission and wireless communication, such as WIFI, 4G, and 5G systems all use OFDM as the basis of signal transmission. In a wireless communication system, a radio frame is strictly defined according to time, and timing synchronization has important significance in the communication system. For OFDM systems, timing synchronization bias or delay spread can cause Inter-symbol interference (Inter-Symbol Interference, ISI) and Inter-subcarrier interference (Inter-Carrier Interference, ICI) in OFDM systems. To avoid the influence of timing synchronization deviation or delay spread as much as possible, guard Period (GP) may be added between OFDM symbols.
According to the nature of the fast fourier transform (Fast Fourier Transform, FFT), the cyclic convolution nature of the FFT allows the signal to be seen as a circle, and a complete signal can be obtained from any position within the circle, starting with the FFT window, but the difference in phase between the sub-carriers is introduced, but this does not affect the integration, no matter where the position of the beginning ends, as long as there is a complete circle, a complete OFDM symbol. Therefore, after adding a Cyclic Prefix (CP), the receiving device can restore the complete signal as long as the timing deviation delay is within the CP range, and the signal received by the receiving device is within the FFT window or the complete OFDM symbol.
Referring to fig. 1, fig. 1 is a schematic diagram of various timing deviations that may occur in OFDM symbols. The position of the timing window is closely related to the accuracy of the OFDM symbol demodulation. As shown in fig. 1, when the timing is advanced but within the CP range, the receiving window contains a part of CP and a part of valid data, and due to its periodicity, still forms an OFDM symbol completely, but there is a time shift in the time domain, a phase difference in the frequency domain, no interference between OFDM symbols is formed, and the data can still be recovered completely. When the timing delay or the timing advance exceeds the CP range, the receiving window contains a part of effective data of the symbol and other OFDM symbol data, at the moment, interference among OFDM symbols can be formed to influence FFT calculation, demodulation of the OFDM symbols can be caused to be completely incapable of demodulation along with the increase of the interference among the symbols.
Timing synchronization is a necessary basis in wireless systems, for which, 3G, 4G, 5G systems all design open loop and closed loop synchronization mechanisms to dynamically adjust timing offset so that the timing offset is within CP range to maintain proper operation of the overall system.
Open loop synchronization generally relies on the physical random access channel Physical Random Access Channel, PRACH, when initial synchronization is not achieved). And the PRACH is distinguished from other physical channels, has a special channel structure, is longer in CP, can tolerate larger time delay, selects a proper PRACH format according to the coverage area of the cell, and ensures that possible timing deviation in the target coverage of the cell is within the CP range of the cell with proper CP length.
In addition, in 5G, for the purpose of detecting far-end interference, a special reference signal RIM-RS is designed, which also has a special channel structure and a longer CP, so as to satisfy the receiving detection of the reference signal under the condition of uncertain delay existing between the interfering transceiver and the transmitter.
However, whether PRACH or RIM-RS, is limited by CP length, has a limited range of delay tolerance, and its design also meets only the requirements of the scenario used. For the situations that the timing deviation is uncertain or the timing deviation exists between the transmitting and receiving parties and cannot be adjusted, and the deviation exceeds the length of the CP, the signal cannot be received correctly.
Therefore, in order to solve the problem that the transmitting device and the receiving device are not synchronized at regular time or the timing deviation exceeds the length of the cyclic prefix, which results in that the receiving device cannot receive the complete OFDM symbol transmitted by the transmitting device, the signal transmitting method, the signal receiving device and the related devices are provided. As described in detail below.
The network system applicable to the embodiment of the present application includes, as shown in fig. 2, a transmitting device 11 and a receiving device 12, and communication is possible between the transmitting device 11 and the receiving device 12.
The transmitting Device 11 may be a terminal, and in practical applications, the terminal may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (webable Device), or a vehicle-mounted Device. The receiving device 12 may be a base station, an access point, or other network element, etc.
The following describes a signal transmitting method and a signal receiving method provided in the embodiments of the present application. It should be noted that, the following description takes 5G as an example, but the application of the method provided in the embodiment of the present application includes, but is not limited to, 5G, and may also be applied to OFDM systems such as 4G. .
Referring to fig. 3, fig. 3 is one of flow charts of a signaling method provided in an embodiment of the present application. The method shown in fig. 3 may be performed by the transmitting device 11.
As shown in fig. 3, the signaling method may include the steps of:
step 201, obtaining time domain data corresponding to at least two identical orthogonal frequency division multiplexing OFDM symbols, wherein the time domain data corresponding to each of the at least two identical OFDM symbols are connected end to end.
It should be noted that orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is one of multi-carrier modulation, and the main idea of OFDM is to divide a channel into several orthogonal sub-channels, convert a high-speed data signal into parallel low-speed sub-data streams, and modulate the sub-streams to transmit on each sub-channel. The parallel transmission of high-speed serial data is realized through frequency division multiplexing, and the parallel transmission device has better multipath fading resistance and can support multi-user access. An OFDM symbol is understood from the perspective of the frequency domain to be a discrete sample obtained by fourier transform, for example, 128 subcarriers are used, and then the 128 discrete samples obtained by fourier transform form an OFDM symbol, where each sample contains all subcarrier information. An OFDM symbol is understood from a time domain perspective as a time-continuous value of discrete samples that are inverse fourier transformed. The length of an OFDM symbol can be understood as the time each OFDM symbol lasts from a time domain perspective.
The information carried by the same OFDM symbol is identical. In specific implementation, at least two frequency domain data corresponding to the same OFDM signals can be obtained first, and then the frequency domain data is subjected to phase shift and inverse fourier transform to obtain at least two time domain data corresponding to the same OFDM signals. The phase shift is carried out on the frequency domain data, and the time domain data obtained after the phase shift is subjected to the inverse Fourier transform are connected end to end, so that the receiving window of the receiving device can intercept the complete OFDM symbol at any position.
For easy understanding, taking three identical OFDM symbols as an example, the end-to-end connection of the time slot data is combined with fig. 4 and 5, so that the receiving window of the receiving device can intercept the complete OFDM symbol at any position for explanation.
Referring to fig. 4, fig. 4 is a schematic diagram of time domain data obtained by performing phase shift and inverse fourier transform on at least three identical OFDM symbols S-1, S-2, S-3 and … ….
In fig. 4, an OFDM symbol is divided into a plurality of tiles of length Ncp, and different tiles are distinguished by different fill patterns. As already mentioned above, the OFDM symbol is understood from a time domain perspective as a time-continuous value obtained by inverse fourier transforming discrete samples, where the time-continuous value of the OFDM symbol is represented by a square lattice of length Ncp. As shown in fig. 5, the OFDM symbols S-1, S-2, S-3 and … … obtained after the phase shift and the inverse fourier transform are connected end to form a plurality of continuous OFDM symbols with Nu length. The multiple squares of each Nu length correspond to time domain data of exactly the same OFDM symbol, so that a full OFDM symbol can be received anywhere within the length range (also the instant long range) of at least three symbols S-1, S-2, S-3 … … for a receive window of length Nu.
Step 202, transmitting the time domain data corresponding to the at least two identical OFDM symbols.
In specific implementation, only the time domain data corresponding to at least two identical OFDM symbols may be transmitted, or the time domain data corresponding to at least two identical OFDM symbols and the time domain data corresponding to different OFDM symbols may be simultaneously transmitted.
The time domain data corresponding to the at least two same OFDM symbols is transmitted, which may be understood that the at least two times of repeating an OFDM symbol is transmitted, and the specific number of times of repeating may be set according to the actual situation, for example, according to the requirement and the total length of the uplink slot of the frame structure.
As described above, at least two time domain data corresponding to the same OFDM symbols are connected end to end, so that the receiving window of the receiving device can intercept the complete OFDM symbol at any position. Thus, the repeated OFDM symbols, which can also be completely received by the receiving apparatus, do not require strict timing synchronization of the transmitting apparatus and the receiving apparatus.
Applications of the method provided by the embodiment of the application include, but are not limited to, transmitting a calibration signal or a reference signal with a longer timing deviation, and measuring the timing deviation duration.
In the embodiment of the invention, by sending at least two identical OFDM symbols, and connecting the time domain data corresponding to the at least two identical OFDM symbols end to end, the data corresponding to the complete OFDM symbols can be received no matter where the receiving window is positioned, thereby solving the problem that the sending device and the receiving device are not in timing synchronization or the timing deviation exceeds the length of the cyclic prefix, so that the receiving device cannot receive the complete OFDM symbols sent by the sending device.
Optionally, step 201 includes:
step 2011, determining frequency domain data corresponding to each symbol in the at least two identical OFDM symbols one by one, and frequency domain phase differences corresponding to each symbol in the at least two identical OFDM symbols one by one.
In specific implementation, it is provided withFor the frequency domain data repeatedly transmitted on S OFDM symbols, S is the number of repeatedly transmitted OFDM symbols, and the value of S is a positive integer, for example, S may be 5.S is OFDM symbol number, S is more than or equal to 0 and less than or equal to S-1, l is {0, 1.,>μ is subcarrier spacing Subcarrier spacing configuration, Δf=2 μ ·15[kHz]K is the subcarrier index Subcarrier index relative to a reference relative to the reference signal and p is the antenna port number Antenna port number.
Usually implemented by Inverse Fast Fourier Transform (iFFT)/fourier transform (FFT) with a certain number of points, f s In order to achieve a sampling rate of the sample,namely, length of time->Sample rate f corresponding to CP of (c) s The number of samples is set->
For resource grid size The size of the resource grid, +.>For the number of sub-carriers per resource block Number of subcarriers per resource block, -, etc.>For cyclic prefix length Cyclic prefix length
From the above equation, the time shift in the time domain corresponds to the phase shift in the frequency domain. The symbol s frequency domain phase difference is:s is more than or equal to 0 and less than or equal to S-1, namely the phase difference of each symbol frequency domain is a constant related to the symbol number S.
Step 2012, multiplying the frequency domain data of the same symbol in the at least two identical OFDM symbols by the frequency domain phase difference to obtain first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols one by one.
In particular, the frequency domain data of the same symbol in at least two identical OFDM symbols is multiplied by the frequency domain phase difference to obtain the first frequency domain data
And step 2013, obtaining time domain data corresponding to the at least two same OFDM symbols based on the first frequency domain data.
In an example one, in a specific implementation, inverse fourier transform may be performed on the first frequency domain data corresponding to each symbol, so as to obtain at least two time domain data corresponding to the same OFDM symbol. The inverse fourier transform formula is common knowledge and will not be described in detail herein.
In the second embodiment, the inverse fourier transform formula described in the first embodiment may be used to perform inverse fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two first time domain data, and then a cyclic prefix is added to the at least two first time domain data to obtain at least two time domain data corresponding to the same OFDM symbol. The cyclic prefix is formed by copying the signal at the tail of the OFDM symbol to the head.
In addition, the embodiment of the application also provides a formula, through which the frequency domain data corresponding to each OFDM symbol can be directly processed to obtain at least two time domain data corresponding to the same OFDM symbol. On the premise that the frequency domain data are the same, the time domain data obtained through the formula are the same as the time domain data obtained through phase shift, inverse Fourier transform and cyclic prefix addition in the second example. The formula is as follows:
where Δf is the subcarrier spacing Subcarrier spacing, T c Is the basic time unit Basic time unit for NR of NR.
It should be noted that the method provided in example one may be applicable to the following scenario one. Scenario one is transmitting at least two different OFDM symbols and each of the at least two different OFDM symbols is repeated at least twice, e.g., transmitting two different OFDM symbols S1 and S2, where S1 is repeated twice and S2 is repeated three times. The time domain data corresponding to at least two identical OFDM symbols (namely S1 repeated twice and S2 repeated three times) are connected end to end, so that the receiving window of the receiving device can intercept the complete OFDM symbols at any position. Thus, the repeated OFDM symbols, which can also be completely received by the receiving apparatus, do not require strict timing synchronization of the transmitting apparatus and the receiving apparatus.
According to the method provided by the embodiment of the invention, only the time domain data corresponding to at least two identical OFDM symbols can be sent, the time domain data corresponding to at least two identical OFDM symbols are connected end to end, or the time domain data corresponding to at least two identical OFDM symbols (the time domain data corresponding to at least two identical OFDM symbols are connected end to end) and the time domain data corresponding to different OFDM symbols can be sent at the same time, and for the time domain data corresponding to at least two identical OFDM symbols, the data corresponding to the complete OFDM symbols can be received no matter where the receiving window is positioned. For time domain data corresponding to different OFDM symbols, the receiving window can be positioned in the range of the cyclic prefix by adding the cyclic prefix, so that the complete data corresponding to the OFDM symbols can be received.
Therefore, by adding cyclic prefixes to at least two first time domain data, when the transmitted signals include time domain data corresponding to different OFDM symbols, the data corresponding to the complete OFDM symbol can be received when the receiving window is positioned within the range of the cyclic prefix.
It should be noted that, the low physical quantity low-PHY functions such as physical layer FFT/iFFT, cyclic prefix deletion CP remove/cyclic prefix addition CP addition, etc., have simple calculation logic and large calculation quantity, and are usually implemented by relatively solidified devices such as FPGA; and this portion is typically separated from the high physical quantity high-PHY. The above implementation mode that the data are multiplied by different phase differences in the frequency domain so that the time domain data are connected end to end is adopted, the low-PHY part does not need any modification, and the low-PHY part is realized by a high-PHY part with more flexible modification.
Referring to fig. 6, fig. 6 is a flowchart of a signal receiving method provided in an embodiment of the present application. The signal receiving method of the embodiment of the present invention may be performed by the receiving apparatus 12.
As shown in fig. 6, the signal receiving method may include the steps of:
step 301, receiving at least part of time domain data corresponding to at least two identical OFDM symbols, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end.
After receiving at least part of the time domain data corresponding to at least two identical OFDM symbols transmitted by the transmitting device 11, the receiving device 12 processes the at least part of the time domain data to obtain at least one complete OFDM symbol.
It should be noted that the receiving apparatus 12 is not necessarily capable of completely receiving at least two identical OFDM symbols transmitted by the transmitting apparatus 11. That is, due to the time delay, the receiving device 12 may not be able to completely receive the time domain data corresponding to at least two identical OFDM symbols, but the receiving device 12 may recover at least one complete OFDM symbol based on the time domain data it receives.
As a implementation manner of the receiving apparatus corresponding to the method embodiment of fig. 3, this embodiment may refer to the related description in the method embodiment of fig. 3, and may achieve the same beneficial effects. In order to avoid repetition of the description, a description thereof will be omitted.
Optionally, the mode of receiving the time domain data corresponding to the at least two identical OFDM symbols is combined reception.
As already mentioned above, the receiving device 12 is not necessarily able to completely receive at least two identical OFDM symbols transmitted by the transmitting device 11. When the receiving device 12 can receive at least two identical OFDM symbols, the time domain data corresponding to the at least two identical OFDM symbols transmitted by the receiving and transmitting device 11 are combined.
In the embodiment of the application, the receiving gain can be improved by receiving the time domain data corresponding to at least two identical Orthogonal Frequency Division Multiplexing (OFDM) symbols.
As can be seen from the related description in the embodiment of the method of fig. 3, the time domain data corresponding to the at least two identical OFDM symbols has at least three generation manners, and the first manner is based on the frequency domain data corresponding to the at least two identical OFDM symbols one by one, and the data is obtained after inverse fourier transform; the second mode is based on the frequency domain data corresponding to the at least two same OFDM symbols one by one, and the data is obtained by phase shifting, inverse Fourier transformation and cyclic prefix adding in sequence; the third way is to directly obtain time domain data based on a formula.
After receiving the time domain data obtained in different generation modes, the receiving device 12 processes the data in different modes, which is specifically as follows.
For receiving time domain data corresponding to at least two identical OFDM symbols generated in the first manner, after step 301, the method further includes:
performing fourier transform on the time domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
For the time domain data corresponding to at least two identical OFDM symbols generated in the second and third manners, after step 301, the method further includes:
removing cyclic prefixes of time domain data corresponding to the at least two identical OFDM symbols to obtain first time domain data;
performing Fourier transformation on the first time domain data to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
In concrete implementation, after the cyclic prefix of the OFDM symbol is removed from the time domain data connected end to end in a conventional cyclic prefix removing manner, the time domain data of each symbol is sequentially different in cyclic prefix CP length time delay, so that the frequency domain data is obtained by Fourier transformationWith phase difference->At this time, by compensating for this phase difference back, reception-side frequency domain data +.>
It should be noted that, the channel structure applicable to the method provided by the embodiment of the present application remains the same as the physical shared channel, and the time-frequency conversion is implemented identically, without being implemented separately for different physical channels.
For ease of understanding, the method provided in the embodiments of the present application is described below with one example.
Referring to fig. 7, in the prior art, there is a timing offset of the signal transceiver, where the timing offset is greater than the duration of the cyclic prefix CP, and at this time, the receiver cannot completely receive the time domain data of each OFDM symbol, and intersymbol interference occurs, so that correct reception cannot be performed.
The method provided by the embodiment of the application is adopted for transmitting and receiving signals:
the signal sender sends OFDM symbols N, N+1, wherein the symbols N, N+1 are time domain data corresponding to two identical OFDM symbols obtained by adopting the method, and the time domain data corresponding to the two identical OFDM symbols are connected end to end;
the signal receiver can completely receive the time domain data of the OFDM symbol n+1, and the corresponding frequency domain data has phase shift, but the data can still be demodulated normally. In addition, the timing offset may be calculated from the channel estimation result.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a signal transmission device provided in an embodiment of the present application, and as shown in fig. 8, a signal transmission device 400 includes:
a first processor 401, configured to obtain time domain data corresponding to at least two identical OFDM symbols, where the time domain data corresponding to each of the at least two identical OFDM symbols are connected end to end;
a first transceiver 402, configured to transmit time domain data corresponding to the at least two identical OFDM symbols.
Optionally, the first processor 401 is further configured to determine frequency domain data corresponding to each symbol in the at least two identical OFDM symbols one by one, and a frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols one by one;
multiplying the frequency domain data of the same symbol in the at least two same OFDM symbols by the frequency domain phase difference to obtain first frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one;
and obtaining time domain data corresponding to the at least two same OFDM symbols based on the first frequency domain data.
Optionally, the first processor 401 is further configured to perform inverse fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two time domain data corresponding to the same OFDM symbol;
or, performing inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two first time domain data; and adding cyclic prefixes to the at least two first time domain data to obtain time domain data corresponding to at least two identical OFDM symbols.
The signal sending apparatus 400 can implement the processes of the method embodiment of fig. 3 in the embodiment of the present invention, and achieve the same beneficial effects, and in order to avoid repetition, a detailed description is omitted here.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a signal receiving apparatus provided in an embodiment of the present application, and as shown in fig. 9, a signal receiving apparatus 500 includes:
a second transceiver 501, configured to receive at least part of time domain data corresponding to at least two identical OFDM symbols, where the time domain data corresponding to each of the at least two identical OFDM symbols is connected end to end.
Optionally, the second transceiver 501 is configured to combine and receive time domain data corresponding to the at least two identical OFDM symbols.
Optionally, the time domain data corresponding to the at least two identical OFDM symbols are data obtained by sequentially performing phase shift and inverse fourier transform based on the frequency domain data corresponding to the at least two identical OFDM symbols one by one.
Optionally, the signal receiving apparatus 500 further includes a second processor, where the second processor is configured to:
performing fourier transform on the time domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
Optionally, the time domain data corresponding to the at least two identical OFDM symbols are data obtained by sequentially performing phase shift, inverse fourier transform and cyclic prefix addition on the basis of the frequency domain data corresponding to the at least two identical OFDM symbols one by one.
Optionally, the signal receiving apparatus 500 further includes a second processor, where the second processor is configured to: removing cyclic prefixes of time domain data corresponding to the at least two identical OFDM symbols to obtain first time domain data;
performing Fourier transformation on the first time domain data to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
The signal receiving apparatus 500 can implement the processes of the method embodiment of fig. 8 in the embodiment of the present invention, and achieve the same beneficial effects, and in order to avoid repetition, a detailed description is omitted here.
The embodiment of the invention also provides communication equipment. Referring to fig. 10, the communication device may include a processor 601, a memory 602, and a program 6021 stored on the memory 602 and executable on the processor 601.
In the case that the communication device is a transmitting device, the program 6021, when executed by the processor 601, may implement any step in the method embodiment corresponding to fig. 3 and achieve the same beneficial effects, which will not be described herein.
In the case that the communication device is a receiving device, the program 6021, when executed by the processor 601, may implement any step in the method embodiment corresponding to fig. 6 and achieve the same beneficial effects, which will not be described herein.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of implementing the methods of the embodiments described above may be implemented by hardware associated with program instructions, where the program may be stored on a readable medium.
The embodiment of the present invention further provides a readable storage medium, where a computer program is stored, where the computer program when executed by a processor may implement any step in the method embodiment corresponding to fig. 3 or fig. 4, and the same technical effect may be achieved, and in order to avoid repetition, a description is omitted herein.
Such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic or optical disk, etc.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (13)

1. A signal transmission method, characterized by being applied to a transmission apparatus, comprising:
obtaining time domain data corresponding to at least two identical OFDM symbols, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end;
and transmitting the time domain data corresponding to the at least two same OFDM symbols.
2. The method of claim 1, wherein the obtaining the time domain data corresponding to the at least two identical orthogonal frequency division multiplexing, OFDM, symbols comprises:
determining frequency domain data corresponding to each symbol in the at least two identical OFDM symbols one by one and frequency domain phase differences corresponding to each symbol in the at least two identical OFDM symbols one by one;
multiplying the frequency domain data of the same symbol in the at least two same OFDM symbols by the frequency domain phase difference to obtain first frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one;
and obtaining time domain data corresponding to the at least two same OFDM symbols based on the first frequency domain data.
3. The method of claim 2, wherein the obtaining time domain data corresponding to the at least two identical OFDM symbols based on the first frequency domain data comprises:
performing inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two time domain data corresponding to the same OFDM symbols;
or, performing inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two first time domain data; and adding cyclic prefixes to the at least two first time domain data to obtain time domain data corresponding to at least two identical OFDM symbols.
4. A signal receiving method, characterized by being applied to a receiving apparatus, comprising:
at least partial time domain data corresponding to at least two identical OFDM symbols are received, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end.
5. The method of claim 4, wherein the time domain data corresponding to the at least two identical OFDM symbols is received in a combined manner.
6. The method of claim 4, wherein the time domain data corresponding to the at least two identical OFDM symbols is data obtained by sequentially performing phase shift and inverse fourier transform based on the frequency domain data corresponding to the at least two identical OFDM symbols one to one.
7. The method of claim 6, wherein after receiving the time domain data corresponding to at least two identical OFDM symbols, the method further comprises:
performing fourier transform on the time domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
8. The method of claim 4, wherein the time domain data corresponding to the at least two identical OFDM symbols is data obtained by sequentially performing phase shift, inverse fourier transform and cyclic prefix addition based on the frequency domain data corresponding to the at least two identical OFDM symbols one to one.
9. The method of claim 8, wherein after receiving the time domain data corresponding to at least two identical OFDM symbols, the method further comprises:
removing cyclic prefixes of time domain data corresponding to the at least two identical OFDM symbols to obtain first time domain data;
performing Fourier transformation on the first time domain data to obtain at least two first frequency domain data;
and performing phase difference compensation on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two same OFDM symbols one by one.
10. A signal transmission apparatus, comprising:
a first processor, configured to obtain time domain data corresponding to at least two identical OFDM symbols, where the time domain data corresponding to each of the at least two identical OFDM symbols are connected end to end;
and the first transceiver is used for transmitting the time domain data corresponding to the at least two same OFDM symbols.
11. A signal receiving apparatus, comprising:
and the second transceiver is used for receiving at least part of time domain data corresponding to at least two identical OFDM symbols, wherein the time domain data corresponding to the at least two identical OFDM symbols are connected end to end.
12. A communication device, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; -characterized in that the processor is adapted to read a program in a memory for implementing the steps in the signaling method according to any of claims 1 to 3; or, a step in a signal receiving method as claimed in any one of claims 4 to 9.
13. A readable storage medium storing a program, wherein the program when executed by a processor implements the steps in the signaling method according to any one of claims 1 to 3; or, a step in a signal receiving method as claimed in any one of claims 4 to 9.
CN202210005026.XA 2022-01-05 2022-01-05 Signal transmitting method, signal receiving method, signal transmitting device and signal receiving device and related equipment Pending CN116455717A (en)

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