WO2022020993A1 - Procédé de fenêtrage dans le domaine temporel et produit associé - Google Patents

Procédé de fenêtrage dans le domaine temporel et produit associé Download PDF

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Publication number
WO2022020993A1
WO2022020993A1 PCT/CN2020/104828 CN2020104828W WO2022020993A1 WO 2022020993 A1 WO2022020993 A1 WO 2022020993A1 CN 2020104828 W CN2020104828 W CN 2020104828W WO 2022020993 A1 WO2022020993 A1 WO 2022020993A1
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Prior art keywords
windowing
window
amplitude
ofdm symbol
window part
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PCT/CN2020/104828
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English (en)
Chinese (zh)
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刘君
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哲库科技(北京)有限公司
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Priority to PCT/CN2020/104828 priority Critical patent/WO2022020993A1/fr
Publication of WO2022020993A1 publication Critical patent/WO2022020993A1/fr

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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

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a time-domain windowing method and related products.
  • both uplink and downlink signals use orthogonal frequency division multiplexing (orthogonal frequency division multiplexing).
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • the time-domain windowing technology is generally used, and the windowing operation is performed on the parts of the adjacent two symbols in the CP of the two adjacent OFDM symbols at the same time, so that the windowed parts of the two symbols are superimposed. It makes the phase jump disappear, thereby reducing out-of-band leakage.
  • the current windowing method still cannot reduce the risk of out-of-band leakage.
  • Embodiments of the present application provide a time-domain windowing method and related products, which can reduce out-of-band leakage caused by overlapping of windowing between two adjacent OFDM symbols.
  • a first aspect of the embodiments of the present application provides a time-domain windowing method, where the time-domain windowing method is used to perform windowing processing on adjacent first OFDM symbols and second OFDM symbols , the amplitude gain of the first OFDM symbol during air interface transmission relative to symbol generation is different from the amplitude gain of the second OFDM symbol during air interface transmission relative to symbol generation; the time domain windowing method includes: :
  • a rising window processing is performed to obtain a rising window composed of a first rising window part and a second rising window part
  • a falling window processing is performed in the windowing time domain to obtain the first falling window part and A falling window formed by a second falling window part
  • the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window are discontinuous
  • the first falling window The amplitude of the last sampling point of the part and the amplitude of the first sampling point of the second falling window are discontinuous; wherein, the first rising window part and the first falling window part are in the In the first OFDM symbol, the second rising window portion and the second falling window portion are within the second OFDM symbol;
  • the discontinuity is such that when the first OFDM symbol and the second OFDM symbol undergo different amplitude gains during air interface transmission, the amplitude of the last sampling point of the first rising window part is the same as the first OFDM symbol.
  • the amplitude of the first sampling point of the two rising window parts is continuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part are continuous.
  • a second aspect of the embodiments of the present application provides a time-domain windowing device, where the time-domain windowing device is configured to perform windowing processing on adjacent first OFDM symbols and second OFDM symbols, the first OFDM symbol The amplitude gain of the symbol during air interface transmission relative to symbol generation is different from the amplitude gain of the second OFDM symbol relative to symbol generation during air interface transmission; the time domain windowing device includes:
  • the windowing unit is used for adding a rising window in the windowing time domain to obtain a rising window composed of a first rising window part and a second rising window part, and performing the adding and falling window processing in the windowing time domain to obtain the following: A falling window formed by the first falling window part and the second falling window part; the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window are discontinuous, The amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window are discontinuous; wherein, the first rising window part and the The first falling window part is within the first OFDM symbol, and the second rising window part and the second falling window part are within the second OFDM symbol;
  • the discontinuity is such that when the first OFDM symbol and the second OFDM symbol undergo different amplitude gains during air interface transmission, the amplitude of the last sampling point of the first rising window part is the same as the first OFDM symbol.
  • the amplitude of the first sampling point of the two rising window parts is continuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part are continuous.
  • a third aspect of the embodiments of the present application provides a baseband chip, including a processing module and an interface, wherein the processing module obtains a program instruction through the interface, and the processing module is configured to call the program instruction, and execute the program instructions as described herein.
  • a fourth aspect of the embodiments of the present application provides a terminal device, including a processor and a memory, where the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instruction, execute the step instruction in the first aspect of the embodiment of the present application.
  • a fifth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a computer to execute the computer program as described in the first embodiment of the present application.
  • a sixth aspect of the embodiments of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute as implemented in the present application. Examples include some or all of the steps described in the first aspect.
  • the computer program product may be a software installation package.
  • the time-domain windowing method may perform windowing processing on the adjacent first OFDM symbol and the second OFDM symbol, and the amplitude gain of the first OFDM symbol during transmission over the air interface relative to the generation of the symbol is the same as that of the second OFDM symbol.
  • the amplitude gain of the OFDM symbol when it is transmitted over the air interface is different from that when the symbol is generated; the rising window processing is performed in the windowing time domain to obtain a rising window composed of the first rising window part and the second rising window part.
  • the drop window processing is performed in the domain to obtain a drop window composed of a first drop window part and a second drop window part; the amplitude of the last sampling point of the first rise window part and the amplitude of the first sample point of the second rise window
  • the amplitude is discontinuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window are discontinuous; wherein, the first rising window part and the first falling window are not continuous during air interface transmission.
  • the window part is in the first OFDM symbol, and the second rising window part and the second falling window part are in the second OFDM symbol; the above-mentioned discontinuity makes the first OFDM symbol and the second OFDM symbol pass through different amplitudes during air interface transmission
  • the amplitude of the last sampling point of the first rising window part is continuous with the amplitude of the first sampling point of the second rising window part, and the amplitude of the last sampling point of the first falling window part is the same as that of the second falling window.
  • the amplitude of the first sample point of the window part is continuous.
  • the amplitude gain of the first OFDM symbol relative to the symbol generation when the first OFDM symbol is transmitted over the air interface is different from the amplitude gain of the second OFDM symbol relative to the symbol generation when the second OFDM symbol is transmitted over the air interface.
  • the rising window is discontinuous in the windowing time domain by adding a rising window
  • the falling window is discontinuous in the windowing time domain by adding a falling window, so that when the first OFDM symbol and the second OFDM symbol are transmitted over the air
  • the rising window is continuous in the windowing time domain
  • the falling window is continuous in the windowing time domain, and the time-domain windowing can still achieve the expected out-of-band radiation suppression effect, which can reduce the adjacent two OFDM Out-of-band leakage caused by windowed overlap between symbols.
  • FIG. 1 is a schematic structural diagram of an OFDM transceiver system provided by an embodiment of the present application
  • FIG. 2a is a schematic diagram of windowing of an existing OFDM symbol provided by an embodiment of the present application.
  • FIG. 2b is a schematic diagram of an existing OFDM symbol during air interface transmission according to an embodiment of the present application.
  • FIG. 2c is a schematic diagram of another existing OFDM symbol during air interface transmission according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a time-domain windowing method provided by an embodiment of the present application.
  • 4a is a schematic diagram of a data structure for generating a first OFDM symbol and a second OFDM symbol provided by an embodiment of the present application;
  • 4b is a schematic diagram of a data structure of adding a cyclic prefix to the first OFDM symbol and the second OFDM symbol according to an embodiment of the present application;
  • 4c is a schematic diagram of a data structure for windowing the first OFDM symbol and the second OFDM symbol provided by an embodiment of the present application;
  • FIG. 4d is a schematic diagram of a data structure when a first OFDM symbol and a second OFDM symbol are sent over the air interface provided by an embodiment of the present application;
  • FIG. 5 is a schematic diagram of a comparative simulation of the out-of-band radiation intensity brought by the windowing method in FIGS. 2a to 2c and the windowing method in FIGS. 4a to 4d provided by an embodiment of the present application;
  • FIG. 6 is a schematic flowchart of another time-domain windowing method provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another data structure for windowing the first OFDM symbol and the second OFDM symbol provided by an embodiment of the present application;
  • FIG. 8 is a schematic structural diagram of a time-domain windowing device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a baseband chip provided by an embodiment of the present application.
  • the terminal devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to wireless modems, as well as various forms of user equipment (user equipment).
  • equipment UE
  • mobile station mobile station
  • terminal device terminal device
  • FIG. 1 is a schematic structural diagram of an OFDM transceiver system provided by an embodiment of the present application.
  • the OFDM transceiver system includes an OFDM transmitting device and an OFDM receiving device. Both the OFDM transmitting device and the OFDM receiving device include a baseband chip and a radio frequency chip.
  • the baseband chip can modulate the data stream to be sent into multiple consecutive OFDM symbols, and perform processing such as adding a cyclic prefix and adding a window to the OFDM symbols.
  • the radio frequency chip can adjust the power of the OFDM symbol and send it through the air interface (air interface).
  • the baseband chip includes a modulation module, a serial/parallel signal conversion module, an inverse fast Fourier transform (IFFT) module, a parallel/serial signal conversion module, a cyclic prefix addition module, and a windowing module.
  • module, symbol processing module and digital-to-analog conversion module, and the radio frequency chip includes an up-conversion module and a power adjustment module.
  • the modulation module first modulates the bit stream with quadrature amplitude modulation (QAM) or quadrature phase shift keying (QPSK), and then the modulated bit stream goes through the serial/parallel signal conversion module in turn.
  • QAM quadrature amplitude modulation
  • QPSK quadrature phase shift keying
  • the serial-to-parallel transform and the IFFT module perform inverse fast Fourier transform (IFFT) transformation to obtain parallel data, and then convert the parallel data into serial data through the parallel-serial transform and the parallel/serial signal conversion module.
  • the prefix module adds a cyclic prefix (also known as a "guard interval") and the windowing module adds windows to form OFDM symbols.
  • a synchronization sequence and a channel estimation sequence are added through the symbol processing module, so that the receiver can perform burst detection, synchronization and channel estimation, and output an orthogonal modulated signal.
  • the digital-to-analog conversion module converts the quadrature modulated signal through digital-to-analog conversion to obtain an analog signal and sends it to the radio frequency chip.
  • the radio frequency chip up-converts the analog signal into a high-frequency signal through the up-conversion module. After power adjustment, it is sent over the air interface.
  • the radio frequency chip includes a channel synchronization and estimation module and a down-conversion module
  • the baseband chip includes a digital-to-analog conversion module, a cyclic prefix removal module, a serial/parallel signal conversion module, and a fast Fourier transform (fast Fourier transform, FFT) module and parallel/serial signal conversion module.
  • FFT fast Fourier transform
  • the down-conversion module After completing time synchronization, fractional frequency offset estimation and correction, the down-conversion module will down-convert the signal from the channel, and the baseband chip will use the analog-to-digital conversion module to convert the analog signal sent from the radio frequency chip to analog-to-digital conversion, and then The cyclic prefix is removed by the cyclic prefix removal module, and then the serial/parallel signal conversion is performed by the serial/parallel signal conversion module to obtain the OFDM symbol.
  • the demodulated signal undergoes parallel/serial signal conversion through the parallel/serial signal conversion module to restore the original bit stream.
  • the windowing module performs windowing on the OFDM symbols, and the main purpose is to solve the out-of-band leakage problem caused by the phase discontinuity between the OFDM symbols after adding the cyclic prefix.
  • the windowed parts of the two symbols are superimposed, so that the phase sudden change disappears, thereby reducing out-of-band leakage.
  • the above windowing method does not consider the power difference of adjacent OFDM symbols when transmitting over the air interface. If the power of a symbol needs to be enlarged or reduced during air interface transmission, the gain values of the adjacent two symbols are different. As a result, the time domain of two adjacent symbols is no longer continuous, resulting in amplitude jumps, which will increase out-of-band leakage.
  • FIG. 2a is a schematic diagram of windowing of an existing OFDM symbol provided by an embodiment of the present application.
  • Fig. 2a when symbols are generated, the symbols need to be windowed.
  • CP cyclic prefix
  • the CP part of the current symbol n+1 is also windowed, so that its envelope slowly rises from 0 to the expected value (as shown by the upward trending triangle in the window length in Figure 2a), and the two windowed parts are superimposed. , which replaces the part where the cyclic prefix length of symbol n+1 is equal to the window length, so that the phase sudden change between two adjacent symbols disappears, thereby reducing out-of-band leakage.
  • FIG. 2b is a schematic diagram of an OFDM symbol provided by an embodiment of the present application when an OFDM symbol is sent over the air interface after a conventional windowing manner.
  • EVM error vector magnitude
  • the actual symbol starting position of the signal sent over the air interface is adjusted, as shown in Figure 2b.
  • the transmission time point of the symbol n+1 is shifted a bit backward compared to Fig. 2a. The purpose of this is to make the receiving end have a better evm.
  • the receiving end when the receiving end measures the evm, it will find the receiving center of the symbol, and measure the evm in the left and right time domains of the receiving center. "Top-heavy", the signal used to measure the evm near the receiving center will get a window. Since the window is a deformed signal, the measured evm will not be very good (the evm result is relatively large). In this way, the windows are evenly distributed at both ends of a symbol, avoiding top-heavy, and the signal for measuring the evm will not be taken on the window, so the measured evm result is better (the evm result is relatively small).
  • the amplitudes of the two symbols are the same.
  • the gain of the default symbol n is equal to the gain of symbol n+1, and the amplitudes of the two symbols are still same.
  • the amplitudes of two adjacent symbols are not necessarily the same.
  • FIG. 2c is another schematic diagram of an OFDM symbol provided by an embodiment of the present application when an OFDM symbol is sent over the air interface after the existing windowing manner.
  • Fig. 2c is a schematic diagram of air interface transmission based on the windowing method of Fig. 2a.
  • Fig. 2c still adopts the air interface transmission method of Fig. 2b.
  • the windowing method of Fig. 2a is still used, the If the gain is greater than the gain of symbol n+1, the time domain at the adjacent two symbols is no longer continuous, resulting in amplitude jumps.
  • the time-domain windowing method in this embodiment of the present application may be improved on the basis of FIGS. 2a-2c.
  • FIG. 3 is a schematic flowchart of a time-domain windowing method provided by an embodiment of the present application.
  • the time-domain windowing method shown in FIG. 3 is used to perform windowing processing on the adjacent first OFDM symbol and the second OFDM symbol.
  • the value gain is different from the amplitude gain when the second OFDM symbol is transmitted over the air interface relative to the amplitude gain when the symbol is generated; the time-domain windowing method may include the following steps.
  • the terminal device performs a rising window processing in the windowing time domain to obtain a rising window composed of a first rising window part and a second rising window part, and performs a falling window processing in the windowing time domain to obtain a first falling window. part and the second falling window part; the amplitude of the last sampling point of the first rising window part is not continuous with the amplitude of the first sampling point of the second rising window part, and the last sampling point of the first falling window part is not continuous. The amplitude of the sampling point is not continuous with the amplitude of the first sampling point of the second drop window.
  • the first rising window part and the first falling window part are in the first OFDM symbol, and the second rising window part and the second falling window part are in the second OFDM symbol;
  • the above-mentioned discontinuity makes the amplitude of the last sampling point of the first rising window part and the first sampling point of the second rising window part after the first OFDM symbol and the second OFDM symbol undergo different amplitude gains during air interface transmission.
  • the amplitudes of the points are continuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part are continuous.
  • the terminal device may generate two adjacent OFDM symbols: a first OFDM symbol and a second OFDM symbol.
  • the amplitude gain of the first OFDM symbol during air interface transmission relative to symbol generation is different from the amplitude gain of the second OFDM symbol during air interface transmission relative to symbol generation.
  • two adjacent OFDM symbols refer to two OFDM symbols that are adjacent in the time domain, that is, there are no other OFDM symbols between the two adjacent OFDM symbols.
  • the first OFDM symbol and the second OFDM symbol may be two adjacent and continuous OFDM symbols, that is, when the symbols are generated, the amplitudes and phases of the two adjacent OFDM symbols are continuous.
  • the time-domain windowing method in this embodiment of the present application may be used.
  • Orthogonal frequency division multiplexing (OFDM) technology belongs to a kind of multi-carrier modulation. It realizes parallel transmission of high-speed serial data through frequency division multiplexing. Multi-user access.
  • the main idea of OFDM is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel.
  • Orthogonal signals can be separated by adopting correlation technology at the receiving end, which can reduce the mutual interference between sub-channels. It should be noted that the signal modulation in the present application may be modulation for baseband signals.
  • FIG. 4a is a schematic diagram of a data structure for generating a first OFDM symbol and a second OFDM symbol according to an embodiment of the present application. As shown in Figure 4a, the lengths of the first OFDM symbol and the second OFDM symbol are the same.
  • IFFT inverse fast Fourier transform
  • the nearest 1300 is greater than or equal to 1300 to the nth power of 2, which is 3048 points.
  • Other bandwidths can be calculated according to the above method, 15M is 1024 points, 10M bandwidth is 1024 points, and 5M is 512 points.
  • FIG. 4b is a schematic diagram of a data structure of adding a cyclic prefix to the first OFDM symbol and the second OFDM symbol according to an embodiment of the present application. As shown in Figure 4b, both the first OFDM symbol and the second OFDM symbol are added with a cyclic prefix CP. Specifically, a certain number of sampling points may be selected in the first OFDM symbol and placed in front of the first OFDM symbol as a cyclic prefix of the first OFDM symbol.
  • the number of sampling points of the IFFT of the first OFDM symbol is 3048, 160 sampling points or 144 sampling points may be selected and placed in front of the first OFDM symbol.
  • the method for adding the cyclic prefix of the second OFDM symbol is similar to that of the first OFDM symbol, and details are not repeated here.
  • the CP of the second OFDM symbol is located at the junction of the first OFDM symbol and the second OFDM symbol.
  • the OFDM symbol After the OFDM symbol is generated, it needs to go through multiple stages (such as digital filter, oversampling, frequency shifting, digital-to-analog conversion, etc.) before it is sent over the air interface. Amplification) to meet the needs of air interface transmission.
  • the signal generated by the baseband needs to go through multiple stages of further processing. Each stage may have different amplification. After multiple stages of digital and analog signal processing, it will finally appear on the air interface with the required power. For example, the following digital filters, oversampling, frequency shifting, digital-to-analog conversion, etc. will have gains. Using different modulation methods, the peak-to-average ratio of the signal is different, and the subsequent digital and analog gain distribution will also be different.
  • the amplitude gain of the first OFDM symbol during air interface transmission relative to symbol generation refers to the ratio of the amplitude of the first OFDM symbol during air interface transmission to the amplitude of the first OFDM symbol during symbol generation.
  • the amplitude gain of the second OFDM symbol during air interface transmission relative to symbol generation refers to the ratio of the amplitude of the second OFDM symbol during air interface transmission to the amplitude of the second OFDM symbol during symbol generation.
  • the terminal may determine the first OFDM symbol according to the power control information included in the downlink control information (DCI) carried in the physical downlink control channel (PDCCH) and the power of the second OFDM symbol when transmitted over the air interface, and the power difference between the two can be calculated to obtain the amplitude gain of the first OFDM symbol relative to the generation of the symbol during transmission over the air interface and the gain of the second OFDM symbol relative to the generation of the symbol during transmission over the air interface. Amplitude gain when .
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • the “continuous” mentioned in the embodiments of the present application may have the following definition: the amplitude variation between any two adjacent sample points in the time domain is within a small range, which is called “continuous”. If there is a jump in the amplitude between two adjacent sampling points in the time domain, it is called “discontinuous”.
  • the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part are discontinuous and include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part is greater than the first threshold; the first threshold is equal to " The maximum value in the absolute value of the amplitude difference between any two adjacent sampling points in the first rising window part” and the “maximum value between any two adjacent sampling points in the second rising window part".
  • the maximum value of the absolute value of the difference is 10, the maximum value of 8 and 10 is 10, and the first threshold value is equal to 10.
  • the last sampling point of the first rising window part and the first sampling point of the second rising window part are two adjacent sampling points in the windowing time domain.
  • the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part continuously include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part is less than or equal to the first threshold
  • the amplitude value of the last sampling point of the first drop window part and the amplitude value of the first sample point of the second drop window part are discontinuous and include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part is greater than the second threshold; the second threshold is equal to " The maximum value in the absolute value of the amplitude difference between any two adjacent sampling points in the first descending window part” and the “maximum value between any two adjacent sampling points in the second descending window part". The maximum value in "Maximum value of the absolute value of the amplitude difference";
  • the amplitude of the last sampling point of the first descending window part and the amplitude of the first sampling point of the second descending window part continuously include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part is less than or equal to the second threshold.
  • the amplitude of the rising window is discontinuous in the windowing time domain, which means that the amplitude of the rising window is discontinuous at the junction of the first OFDM symbol and the second OFDM symbol.
  • the maximum value of the absolute value of the amplitude difference between any two adjacent sampling points in the first rising window part is 8, and the amplitude value between any two adjacent sampling points in the second rising window part is 8.
  • the maximum value of the absolute values of the difference is 10, and the first threshold is equal to 10.
  • the last sampling point of the first rising window part and the first sampling point of the second rising window part are two adjacent sampling points in the windowing time domain.
  • the amplitude of the rising window is continuous in the windowed time domain, which means that the amplitude of the rising window is continuous at the junction of the first OFDM symbol and the first OFDM symbol.
  • the absolute value of the difference between the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part is less than or equal to the above-mentioned first threshold.
  • the amplitude of the drop window is discontinuous in the windowing time domain, which means that the amplitude of the drop window is discontinuous at the junction of the first OFDM symbol and the second OFDM symbol.
  • the amplitude of the last sampling point of the first falling window part ie, the last sampling point of the first OFDM symbol
  • the second threshold is equal to "in the absolute value of the amplitude difference between any two adjacent sampling points in the first drop window part
  • the maximum value of the absolute value of the amplitude difference between any two adjacent sampling points in the first drop window part is 7, and the amplitude value between any two adjacent sample points in the second drop window part
  • the maximum value of the absolute values of the difference is 9, and the maximum value of 7 and 9 is 9, so the second threshold value is equal to 9.
  • the last sampling point of the first descending window part and the first sampling point of the second descending window part are two adjacent sampling points in the windowing time domain.
  • the amplitude of the falling window is continuous in the windowed time domain, which means that the amplitude of the falling window is continuous at the junction of the first OFDM symbol and the first OFDM symbol.
  • the absolute value of the difference between the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part is less than or equal to the above-mentioned second threshold.
  • Both the rising window and the falling window are located in the windowing time domain, the amplitude of the first rising window part shows an upward trend in the first OFDM symbol, and the amplitude of the second rising window part has an upward trend.
  • the amplitude of the first falling window part has a falling trend in the first OFDM symbol, and the amplitude of the second falling window part is in the second OFDM symbol. There is a downward trend within the symbol.
  • the windowed time domain may be located at the junction of the first OFDM symbol and the second OFDM symbol, and the junction of the first OFDM symbol and the second OFDM symbol may include the CP of the second OFDM symbol .
  • the windowed time domain may be located within the CP of the second OFDM symbol.
  • the windowed time domain is a time domain in which window processing is performed in the symbol.
  • Windowing processing refers to taking a piece of sampling point data on an OFDM symbol (for example, the cyclic prefix of the symbol), and then processing the amplitude of this sampling point data through a window function, and using the processed data as an OFDM symbol Corresponding data in the windowed time domain.
  • the rising window is to take a piece of sampling point data on the second OFDM symbol, and then process the amplitude of the sampling point data through the window function, and use the processed data as the second OFDM symbol in the windowing time domain.
  • the drop window is to take a section of sampling point data on the first OFDM symbol, and then process the amplitude of this sampling point data through a window function, and use the processed data as the data corresponding to the first OFDM symbol in the windowing time domain .
  • the window function refers to a function for processing the amplitude of the sampling point data in the windowed time domain of the OFDM symbol.
  • the data of the sampling points in the windowed time domain of the OFDM symbol show an upward trend.
  • the data of the sampling points in the windowing time domain of the OFDM symbol show a downward trend.
  • the number of sampling points in the windowed time domain is 10, and before the windowing is not applied, the amplitude of each sampling point is 30.
  • the data of the 10 sampling points in the windowed time domain of the OFDM symbol are 2, 4, 6, 8, 10, 12, 14, 16, 18, and 30, respectively.
  • the down-window processing is performed, the data of the 10 sampling points in the windowed time domain of the OFDM symbol are 30, 18, 16, 14, 12, 10, 8, 6, 4, and 2, respectively.
  • the windowing process implemented in the present application makes the amplitude of the rising window discontinuous in the windowing time domain, and the amplitude of the falling window is discontinuous in the windowing time domain; during air interface transmission, the first OFDM symbol and the second OFDM symbol pass through After different amplitude gains, the amplitude of the rising window is continuous in the windowing time domain, and the amplitude of the falling window is continuous in the windowing time domain.
  • windowing processing methods to realize that the amplitude of the rising window is discontinuous in the windowing time domain, and the amplitude of the falling window is discontinuous in the windowing time domain.
  • the amplitude of the up-window portion of the OFDM symbol with a relatively large gain can be pre-reduced on the basis of normal windowing (one processing method: the ratio of pre-reduction is equal to two symbols)
  • the gain ratio of the symbol with a relatively small gain to the symbol with a relatively large gain while the amplitude of the rising window portion of the symbol with a relatively small gain is normally windowed.
  • the amplitude of the rising window part of the OFDM symbol with relatively small gain can be pre-amplified on the basis of normal windowing (a possible processing method: the ratio of pre-amplification) It is equal to the gain ratio of the symbol with a relatively large gain and the symbol with a relatively small gain among the two symbols), and normal windowing is performed on the amplitude of the rising window portion of the symbol with a relatively large gain.
  • normal windowing a possible processing method: the ratio of pre-amplification
  • the amplitude of the rising window part of the OFDM symbol with a relatively large gain can be pre-reduced on the basis of normal windowing, and the rising window of the OFDM symbol with a relatively small gain can be pre-reduced.
  • Part of the amplitude is pre-amplified on the basis of normal windowing (a possible processing method: the ratio of the pre-amplification ratio to the reduction ratio is equal to the symbol with a relatively large gain and the symbol with a relatively small gain among the two symbols. symbol gain ratio).
  • the amplitude of the rising window part of the OFDM symbol with a relatively small gain can be subjected to the first type of pre-amplification processing on the basis of normal windowing, and the rising window of the symbol with a relatively large gain can be used.
  • Part of the amplitude is subjected to the second type of pre-amplification processing on the basis of normal windowing (a possible processing method: the ratio of the first type of pre-amplification and the ratio of the second type of pre-amplification processing is equal to the gain in the two symbols. The ratio of the gain of a large symbol to a symbol with a relatively small gain).
  • the amplitude of the rising window part of the OFDM symbol with a relatively small gain can be subjected to the first type of pre-reduction processing on the basis of normal windowing, and the rising window of the symbol with a relatively large gain can be processed.
  • Part of the amplitude is subjected to the second type of pre-reduction processing on the basis of normal windowing (a possible processing method: the ratio of the second type of pre-reduction processing and the ratio of the first type of pre-reduction processing is equal to the gain in the two symbols. The ratio of the gain of a large symbol to a symbol with a relatively small gain).
  • FIG. 4c is a schematic diagram of a data structure for windowing the first OFDM symbol and the second OFDM symbol according to an embodiment of the present application.
  • the windowed time domain is the time domain corresponding to the window length in Figure 4c. It can be seen from Figure 4c that, in order to make the receiving end have a better error vector magnitude EVM, the actual symbol starting position of the signal sent by the air interface will be adjusted during air interface transmission.
  • the air interface of the second OFDM symbol is used.
  • the sending position is located at the middle point of the windowed time domain as an example for description.
  • a portion of the windowed time domain is located within the first OFDM symbol, and another portion of the windowed time domain is located within the second OFDM symbol.
  • the air interface transmission position of the second OFDM symbol is the junction of the first rising window part and the second rising window part of the rising window.
  • the amplitudes of the second rising window parts are processed separately, so that the amplitudes of the rising windows are continuous in the windowing time domain and the amplitudes of the falling windows are continuous in the windowing time domain during air interface transmission.
  • the drop window is generated, if the powers of the first OFDM symbol and the second OFDM symbol are different when they are transmitted over the air interface, the gains of the two symbols are also different.
  • the amplitude and the amplitude of the second drop window are processed separately, so that the amplitude of the drop window is continuous in the windowing time domain and the amplitude of the drop window is continuous in the windowing time domain during air interface transmission.
  • the amplitude of the rising window is changed when the window is added. It is discontinuous in the domain, and the amplitude of the falling window is discontinuous in the windowed time domain. Specifically, the amplitude of the last sampling point of the first rising window part CO' (ie, the amplitude of the point O' in Fig. 4c) is the same as the amplitude of the first sampling point of the second rising window part (ie, Fig. 4c). The amplitude of point O in 4c) produced the jump.
  • the amplitude of the last sampling point of the first drop window part CO' i.e., the amplitude of point O' in Figure 4c
  • the amplitude of the first sample point of the second drop window part i.e., the amplitude of O' in Figure 4c point amplitude
  • the amplitude of the rising window (CO'OD in Figure 4c) jumps at the junction of the two symbols, the amplitude is discontinuous, and the rising window is distorted; similarly, the falling The window (AO'OB in Figure 4c) jumps in amplitude at the junction of two symbols, the amplitude is discontinuous, and the falling window is distorted.
  • the windowing method of Figure 4c causes distortion of the up-window and down-window, this is not a real distortion, but a pre-distortion process, and the distortion caused by this pre-distortion process will be corrected back in the subsequent gain section.
  • the amplitude of the rising window is continuous in the windowing time domain
  • the amplitude of the falling window is continuous in the windowing time domain. See Figure 4d for details.
  • FIG. 4d is a schematic diagram of a data structure when the first OFDM symbol and the second OFDM symbol are transmitted over the air interface provided by an embodiment of the present application.
  • FIG. 4c After the amplitudes of the first OFDM symbol and the second OFDM symbol are amplified to different degrees, a schematic diagram of the data structure of the symbols shown in FIG. 4d when transmitted over the air interface is obtained.
  • the amplitude of the first OFDM symbol is amplified, including the amplitude amplification of the first rising window part and the first falling window part.
  • the amplitude of the second OFDM symbol is enlarged, including the amplitude enlargement of the second rising window part and the second falling window part.
  • the above-mentioned amplification process is to amplify the amplitude of the symbols according to the difference of the transmit power of each symbol after windowing and before air interface transmission.
  • the terminal device determines the original rising windowing coefficient of the rising window
  • the terminal device selects the second OFDM symbol as a reference symbol, and performs windowing processing in the second windowing sub-time domain according to the original rising windowing coefficient to obtain the second rising window part;
  • the terminal device calculates the preprocessing up-windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original up-windowing coefficient;
  • the terminal device performs windowing processing in the first windowing sub-time domain according to the preprocessing up-windowing coefficient to obtain the first up-windowing part.
  • step 301 the terminal device performs window addition and drop processing in the windowing time domain to obtain a drop window composed of a first drop window portion and a second drop window portion, which may specifically include the following steps:
  • the terminal device determines the original drop windowing coefficient of the drop window
  • the terminal device selects the second OFDM symbol as a reference symbol, and performs windowing processing in the second windowing sub-time domain according to the original downwinding coefficient to obtain the second downwinding part;
  • the terminal device calculates and obtains the preprocessing drop windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original drop windowing coefficient;
  • the terminal device performs windowing processing in the first windowing sub-time domain according to the preprocessing drop windowing coefficient to obtain the first drop window part.
  • a part of the rising window and the falling window respectively belong to the first OFDM symbol and the second OFDM symbol in the time domain.
  • the rising window includes a first rising window part and a second rising window part
  • the falling window includes a first falling window part and a second falling window part
  • the first rising window part and the first falling window part are in the first OFDM symbol
  • the second The rising window portion and the second falling window portion are within the second OFDM symbol.
  • the windowing coefficient can be understood as a set of weighting coefficients, and the windowed result can be obtained by multiplying the amplitude of each sampling point in the windowing time domain by the corresponding weighting coefficient of each sampling point. Windowing in the time domain represents a dot product in the time domain. In a mathematical sense, the windowing coefficient can be understood as a matrix or vector.
  • the second OFDM symbol is selected as the reference signal, and the windowing operation of the second OFDM symbol is the same as the existing one. Specifically, window processing is performed on the second windowing sub-time domain of the second OFDM symbol according to the original rising windowing coefficient to obtain a second rising window part, and the second windowing time of the second OFDM symbol is added according to the original falling windowing coefficient. The domain is windowed to obtain the second drop window part.
  • the original up-windowing coefficient and the original down-windowing coefficient are the windowing coefficients when the gains of the two symbols are considered to be the same.
  • the number of sampling points in the windowed time domain is 10, 1-5 sampling points belong to the first OFDM symbol, and 6-10 sampling points belong to the second OFDM symbol.
  • the original ascending windowing coefficients are (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1), and the original descending windowing coefficients are (1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3 , 0.2, 0.1).
  • the above-mentioned 1-5 sampling points belong to the first windowing sub-time domain, and the above-mentioned 6-10 sampling points belong to the second windowing sub-time domain.
  • the five sampling points corresponding to the second windowing sub-time domain of the second OFDM symbol can be dot-multiplied by the last five (0.6, 0.7, 0.8, 0.9, 1) of the original rising windowing coefficients to obtain the second rising window. part (as shown in the DO part of FIG. 4c ), so as to realize the windowing operation of the rising window in the second OFDM symbol. It is also possible to multiply the five sampling points corresponding to the second windowing sub-time domain of the second OFDM symbol with the last five (0.5, 0.4, 0.3, 0.2, 0.1) points in the original drop windowing coefficients to obtain the second drop The window part (as shown in the BO part of FIG. 4c ), so as to realize the windowing operation of the drop window in the second OFDM symbol.
  • windowing coefficient of the windowing operation of the first OFDM symbol is the same as the windowing coefficient of the windowing operation of the second OFDM symbol, but the gains of the two symbols are different, out-of-band leakage will increase.
  • the terminal device calculates and obtains the preprocessing up-windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original up-windowing coefficient.
  • the terminal device calculates and obtains the preprocessing drop windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original drop windowing coefficient.
  • the preprocessing up-windowing coefficient is generally less than or equal to the original up-windowing coefficient, and the preprocessing down-windowing coefficient is generally smaller than or equal to the original up-windowing coefficient.
  • the window coefficient is generally smaller than or equal to the original drop windowing coefficient. If the power of the first OFDM symbol when transmitted over the air interface is lower than the power of the second OFDM symbol when transmitted over the air interface, the preprocessing up-windowing coefficient is generally greater than or equal to the original up-windowing coefficient, and the preprocessing down-windowing coefficient is generally larger than the original up-windowing coefficient. Must be greater than or equal to the original drop windowing factor.
  • the terminal device performs windowing processing on the first rising window part according to the preprocessing rising windowing coefficient, and performs windowing processing on the first falling window part according to the preprocessing falling windowing coefficient.
  • the number of sampling points in the windowed time domain is 10, 1-5 sampling points belong to the first OFDM symbol, and 6-10 sampling points belong to the second OFDM symbol.
  • the original ascending windowing coefficients are (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1), and the original descending windowing coefficients are (1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3 , 0.2, 0.1).
  • the above 1 to 5 sampling points belong to the first rising window part and the first falling window part, and the above 6 to 10 sampling points belong to the second rising window part and the second falling window part.
  • the preprocessing down-windowing coefficient calculated in step (14) is (1, 0.85, 0.6, 0.45, 0.3).
  • the 5 sampling points corresponding to the first rising window part of the first OFDM symbol can be dot-multiplied by the preprocessing rising windowing coefficients (0.1, 0.15, 0.2, 0.25, 0.3) respectively to realize the rising window in the first OFDM symbol.
  • the windowing operation is shown in the CO' section of Figure 4c.
  • the 5 sampling points corresponding to the first drop window part of the first OFDM symbol can also be dot-multiplied by the preprocessing drop windowing coefficients (1, 0.85, 0.6, 0.45, 0.3) to realize that the drop window is within the first OFDM symbol
  • the windowing operation is shown in the AO' part of Figure 4c.
  • the terminal device determines the original rising windowing coefficient of the rising window
  • the terminal device selects the first OFDM symbol as a reference symbol, and performs windowing processing in the first windowing sub-time domain according to the original rising windowing coefficient to obtain the first rising window part;
  • the terminal device calculates the preprocessing up-windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original up-windowing coefficient;
  • the terminal device performs windowing processing in the second windowing sub-time domain according to the preprocessing up-windowing coefficient to obtain the second up-windowing part.
  • step 301 the terminal device performs a drop window processing in the windowing time domain to obtain a drop window composed of a first drop window portion and a second drop window portion, which may specifically include the following steps:
  • the terminal device determines the original drop windowing coefficient of the drop window
  • terminal equipment selects described first OFDM symbol as reference symbol, carries out windowing process in described first windowing sub-time domain according to described original drop windowing coefficient, obtains described first drop window part;
  • the terminal device calculates and obtains the preprocessing drop windowing coefficient according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original drop windowing coefficient;
  • the terminal device performs windowing processing in the second windowing sub-time domain according to the preprocessing drop windowing coefficient to obtain the second drop window part.
  • steps (31) to (34) in this embodiment of the present application is similar to the above-mentioned steps (11) to (14), the difference lies in the selection of steps (31) to (34)
  • the reference symbol of is the first OFDM symbol, and the reference symbol selected in steps (11) to (14) is the second OFDM symbol.
  • the specific implementation of steps (41) to (44) in this embodiment of the present application is similar to the above-mentioned steps (21) to (24), the difference lies in the selection of steps (41) to (44)
  • the reference symbol of is the first OFDM symbol, and the reference symbol selected in steps (21) to (24) is the second OFDM symbol. It will not be repeated here.
  • step (13) and step (23) or step (33) and step (43) may include the following steps:
  • the terminal device calculates, according to the difference between the power of the first OFDM symbol when the first OFDM symbol is sent over the air interface and the power of the second OFDM symbol when it is sent over the air interface, that the first OFDM symbol is generated relative to the symbol when the first OFDM symbol is sent over the air interface
  • the terminal device calculates and obtains the preprocessing up-windowing coefficient according to the ratio and the original up-winding coefficient
  • the terminal device calculates and obtains the preprocessing drop windowing coefficient according to the ratio and the original drop windowing coefficient.
  • the modulated signal power of all symbols is set to be P_in (dB).
  • the air interface transmit power of the first OFDM symbol is P1_out (dB)
  • the air interface transmit power of the second OFDM symbol is P2_out (dB)
  • the amplitude gain of the first OFDM symbol during the air interface transmission relative to the symbol generation gain1 10 ⁇ [(P1_out ⁇ P_in)/30]
  • the amplitude gain of the second OFDM symbol during air interface transmission relative to the amplitude gain during symbol generation gain2 10 ⁇ [(P2_out ⁇ P_in)/30].
  • " ⁇ " is used to represent the exponentiation symbol.
  • step 301 Before performing step 301, the following steps may also be performed:
  • a first OFDM symbol and a second OFDM symbol are generated, the first OFDM symbol and the second OFDM symbol having the same magnitude.
  • the amplitudes of all symbols are made the same. In this way, the quantization noise produced by each symbol is the same. If the amplitudes of the symbols are different, a wider bit width will be used when generating the signal. Because some symbols have large amplitudes and some have small amplitudes, in order to take care of symbols with small amplitudes, the required bit width is relatively wide, so that sufficient quantization and signal-to-noise ratio can be achieved.
  • the ascending window and the descending window have the same window function type, and the window function type includes any one of a triangular window, a Hanning window, and a Hamming window.
  • the rising window in the embodiment of the present application has the same window function type as the falling window, for example, the types of the rising window and the falling window are both triangular windows.
  • the rising window is processed to make the rising window at
  • the windowing time domain is discontinuous, and the falling window processing makes the falling window discontinuous in the windowing time domain, so that during air interface transmission, after the first OFDM symbol and the second OFDM symbol undergo different amplitude gains, the rising window is added to the window. It is continuous in the time domain, and the falling window is continuous in the windowed time domain.
  • the time domain windowing can still achieve the expected out-of-band radiation suppression effect, which can reduce the out-of-band leakage caused by the overlap of the window between two adjacent OFDM symbols.
  • FIG. 5 is a schematic diagram of a comparative simulation of out-of-band radiation intensity brought by the windowing method of FIGS. 2 a to 2 c and the windowing method of FIGS. 4 a to 4 d according to an embodiment of the present application.
  • the curve represented by the solid line in Fig. 5 is the radiation intensity using the windowing method of Figs. 2a-2c, and the curve represented by the dotted line is the radiation intensity using the windowing method of Figs. 4a-4d.
  • the abscissa of FIG. 5 is the frequency of the bandwidth, and the ordinate of FIG. 5 is the radiation intensity.
  • the other conditions of these two windowing methods are the same.
  • the length of the cyclic prefix is 144 sampling points, the bandwidth is 20MHz, and the number of transmitted physical resource blocks (PRBs) is 100.
  • PRBs transmitted physical resource blocks
  • the difference is in the way of adding windows. It can be seen from Figure 5 that in the band (-10MHz to 10MHz), the radiation intensity of the two is not much different. It is obviously greater than the radiation intensity of the windowing method of 4a-4d. It can be seen that the expected out-of-band radiation suppression effect can be achieved by using the windowing methods shown in FIGS. 4a to 4d, and the out-of-band leakage caused by the overlapping of windows between two adjacent OFDM symbols can be reduced.
  • FIG. 6 is a schematic flowchart of another time-domain windowing method provided by an embodiment of the present application. As shown in FIG. 6 , FIG. 6 is obtained by further optimization on the basis of FIG. 3 , and the time-domain windowing method may include the following steps.
  • a terminal device During symbol generation, a terminal device generates two adjacent OFDM symbols: a first OFDM symbol and a second OFDM symbol.
  • the amplitude gain of the first OFDM symbol during air interface transmission relative to symbol generation is different from the amplitude gain of the second OFDM symbol during air interface transmission relative to symbol generation.
  • step 501 may refer to the specific description of FIG. 3 , which will not be repeated here.
  • the terminal device adds a cyclic prefix to the front end of the second OFDM symbol.
  • a cyclic prefix is added at the front end of the second OFDM symbol.
  • the introduction of the cyclic prefix will destroy the phase continuity between the original OFDM symbols, causing the signal to leak in the frequency domain, resulting in out-of-band frequency.
  • the windowing operation in step 603 can avoid the above problems.
  • the terminal device performs a window-adding process in the windowing time domain to obtain a rising window composed of a first rising window part and a second rising window part, and performs a descending window processing in the windowing time domain to obtain a rising window consisting of the first rising window part and the second rising window part. part and the second falling window part; the amplitude of the last sampling point of the first rising window part is not continuous with the amplitude of the first sampling point of the second rising window part, and the last sampling point of the first falling window part is not continuous. The amplitude of the sampling point is not continuous with the amplitude of the first sampling point of the second drop window.
  • the first rising window part and the first falling window part are in the first OFDM symbol, and the second rising window part and the second falling window part are in the second OFDM symbol;
  • the above-mentioned discontinuity makes the amplitude of the last sampling point of the first rising window part and the first sampling point of the second rising window part after the first OFDM symbol and the second OFDM symbol undergo different amplitude gains during air interface transmission.
  • the amplitudes of the points are continuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part are continuous.
  • step 603 may refer to the specific description of step 301 in FIG. 3 , which will not be repeated here.
  • the cyclic prefix of the second OFDM symbol is processed by adding a rising window and adding a falling window, so as to obtain the rising window and the falling window, even if the adjacent two When the symbol is sent over the air interface, the amplitude gain is different from that when the symbol is generated.
  • adding a rising window processing the rising window is discontinuous in the windowing time domain, and adding a falling window processing makes the falling window discontinuous in the windowing time domain.
  • the rising window is continuous in the windowing time domain
  • the falling window is continuous in the windowing time domain
  • the time domain windowing can still obtain the expected bandwidth.
  • the out-of-band radiation suppression effect can reduce the out-of-band leakage caused by the overlapping of windows between two adjacent OFDM symbols.
  • FIG. 7 is a schematic diagram of another data structure for windowing the first OFDM symbol and the second OFDM symbol provided by an embodiment of the present application.
  • (a) in Figure 7 is the existing overlapping windowing method. It can be seen from Figure (a) that when symbols are generated, the windowed time domain (that is, the window length at the junction of two symbols) is located in the second OFDM Within the CP of the symbol (the CP bordering the first OFDM symbol), the ascending and descending windows overlap in the windowed time domain.
  • the position of the symbol changes, and a part of the windowed time domain is located in the first OFDM symbol, and the other part is located in the second OFDM symbol.
  • (b) in Figure 7 is the amplitude jump caused by the existing overlapping windowing method during air interface transmission (the gains of adjacent symbols are different), and the amplitudes of the rising window and the falling window are discontinuous in the windowing time domain. , the existing windowing method does not consider that two symbols will have different gains when transmitted over the air interface, which leads to the jump in amplitude at the junction of adjacent symbols after windowing.
  • (c) in Fig. 7 is the overlapping windowing method of the present application.
  • the terminal device includes corresponding hardware structures and/or software modules for executing each function.
  • the present application can be implemented in hardware or in the form of a combination of hardware and computer software, in combination with the units and algorithm steps of each example described in the embodiments provided herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the terminal device may be divided into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation.
  • FIG. 8 is a schematic structural diagram of a time-domain windowing device provided by an embodiment of the present application.
  • the time-domain windowing device 800 is applied to a terminal device, and the time-domain windowing device 800 may A windowing unit 801 is included, wherein:
  • the windowing unit 803 is used to perform a window-raising process in the windowing time domain to obtain a rising window composed of a first rising window part and a second rising window part, and perform the windowing process in the windowing time domain to obtain a rising window.
  • a falling window consisting of a first falling window part and a second falling window part; the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window are discontinuous , the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window are discontinuous; wherein, the first rising window part and all the the first falling window part is within the first OFDM symbol, and the second rising window part and the second falling window part are within the second OFDM symbol;
  • the discontinuity is such that when the first OFDM symbol and the second OFDM symbol undergo different amplitude gains during air interface transmission, the amplitude of the last sampling point of the first rising window part is the same as the first OFDM symbol.
  • the amplitude of the first sampling point of the two rising window parts is continuous, and the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part are continuous.
  • the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part are discontinuous and include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part is greater than the first threshold;
  • the first threshold is equal to " The maximum value in the absolute value of the amplitude difference between any two adjacent sampling points in the first rising window part” and the “maximum value between any two adjacent sampling points in the second rising window part".
  • the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part continuously include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first rising window part and the amplitude of the first sampling point of the second rising window part is less than or equal to the first threshold
  • the amplitude value of the last sampling point of the first drop window part and the amplitude value of the first sample point of the second drop window part are discontinuous and include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part is greater than the second threshold; the second threshold is equal to " The maximum value in the absolute value of the amplitude difference between any two adjacent sampling points in the first descending window part” and the “maximum value between any two adjacent sampling points in the second descending window part”. "Maximum of the maximum of the absolute values of the magnitude difference";
  • the amplitude of the last sampling point of the first descending window part and the amplitude of the first sampling point of the second descending window part continuously include:
  • the absolute value of the difference between the amplitude of the last sampling point of the first falling window part and the amplitude of the first sampling point of the second falling window part is less than or equal to the second threshold.
  • the windowing time domain includes a first windowing sub-time domain and a second windowing sub-time domain, and the first rising window part and the first falling window part are in the first windowing sub-time domain, The second rising window part and the second falling window part are in the second windowing sub-time domain; the windowing unit 801 performs a rising window processing in the windowing time domain, and obtains the first rising window part and
  • the rising window formed by the second rising window is specifically: determining the original rising windowing coefficient of the rising window; selecting the second OFDM symbol as a reference symbol, and adding the second rising window according to the original rising windowing coefficient Windowing is performed in the time domain of the window to obtain the second rising window part; according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original rising window Calculate the coefficient to obtain a pre-processing up-windowing coefficient; perform windowing processing in the first windowing sub-time domain according to the pre-processing up-wind
  • the windowing unit 803 performs a windowing process in the windowing time domain, and obtains a decreasing window composed of a first decreasing window portion and a second decreasing window portion, specifically: determining the original decreasing windowing coefficient of the decreasing window; Selecting the second OFDM symbol as a reference symbol, and performing windowing processing in the second windowing sub-time domain according to the original drop windowing coefficient to obtain the second drop window part; The power during air interface transmission, the power of the second OFDM symbol during air interface transmission, and the original drop windowing coefficient are calculated to obtain a preprocessing drop windowing coefficient; Windowing is performed in the time domain of the window to obtain the first descending window part.
  • the windowing time domain includes a first windowing sub-time domain and a second windowing sub-time domain, and the first rising window part and the first falling window part are in the first windowing sub-time domain, The second rising window part and the second falling window part are in the second windowing sub-time domain; the windowing unit 801 performs a rising window processing in the windowing time domain, and obtains the first rising window part and
  • the rising window formed by the second rising window is specifically: determining the original rising windowing coefficient of the rising window; selecting the first OFDM symbol as a reference symbol, and adding the first rising window according to the original rising windowing coefficient Windowing is performed in the time domain of the window to obtain the first rising window part; according to the power of the first OFDM symbol during air interface transmission, the power of the second OFDM symbol during air interface transmission, and the original rising window
  • the coefficient is calculated to obtain a preprocessing up-windowing coefficient; the windowing process is performed in the second windowing sub-time domain according to the preprocessing up-winding coefficient to obtain the second
  • the windowing unit 803 performs a windowing process in the windowing time domain, and obtains a decreasing window composed of a first decreasing window portion and a second decreasing window portion, specifically: determining the original decreasing windowing coefficient of the decreasing window; Select the first OFDM symbol as a reference symbol, perform windowing processing in the first windowing sub-time domain according to the original drop-windowing coefficient, and obtain the first drop-window part; The power during air interface transmission, the power of the second OFDM symbol during air interface transmission, and the original drop windowing coefficient are calculated to obtain a preprocessing drop windowing coefficient; Windowing is performed in the time domain of the window to obtain the second descending window portion.
  • the windowing unit 801 calculates and obtains the preprocessing rise plus window according to the power of the first OFDM symbol when it is sent over the air interface, the power of the second OFDM symbol when it is sent over the air interface, and the original rising windowing coefficient.
  • Window coefficient according to the power of the first OFDM symbol when the air interface is sent, the power of the second OFDM symbol when the air interface is sent, and the original drop windowing coefficient to calculate and obtain the preprocessing drop windowing coefficient, specifically: according to The difference between the power of the first OFDM symbol during air interface transmission and the power of the second OFDM symbol during air interface transmission is calculated to calculate the amplitude gain of the first OFDM symbol during air interface transmission relative to the symbol generation time and the The ratio of the amplitude gain of the second OFDM symbol when the second OFDM symbol is transmitted over the air interface relative to the amplitude gain when the symbol is generated; the preprocessing drop-windowing coefficient is calculated and obtained according to the ratio and the original drop-windowing coefficient.
  • the time-domain windowing apparatus 800 further includes a cyclic prefix adding unit 802 .
  • the cyclic prefix adding unit 802 is configured to perform a windowing process in the windowing time domain by the windowing unit 801 to obtain a rising window composed of a first rising window part and a second rising window part, before the rising window is obtained.
  • a cyclic prefix is added to the front end of the second OFDM symbol, and the windowed time domain is located within the cyclic prefix.
  • the time-domain windowing apparatus 800 further includes a generating unit 801 .
  • a generating unit 801 is configured to generate the first OFDM symbol and the second OFDM symbol before the windowing unit 803 performs the up-window processing and the down-window processing, and the first OFDM symbol is the same as the amplitude of the second OFDM symbol.
  • the ascending window and the descending window have the same window function type, and the window function type includes any one of a triangular window, a Hanning window, and a Hamming window.
  • the window adding unit 801, the cyclic prefix adding unit 802, and the generating unit 801 in the embodiment of the present application may be a processor in a terminal device, and may specifically be a baseband chip with a modulation and demodulation function.
  • the time-domain windowing device may perform up-window processing and down-window processing in the windowed time domain to obtain the up-window sum and the down-window processing.
  • Drop window after the above-mentioned operations of adding a rising window and a falling window, even if two adjacent symbols have different amplitude gains relative to the symbol generation when they are sent over the air interface, the rising window is processed by adding a rising window.
  • the domain is discontinuous, and the falling window processing makes the falling window discontinuous in the windowing time domain, so that when the first OFDM symbol and the second OFDM symbol undergo different amplitude gains, the rising window is continuous in the windowing time domain.
  • the falling window is continuous in the windowed time domain, and the time domain windowing can still achieve the expected out-of-band radiation suppression effect, which can reduce the out-of-band leakage caused by the overlap of the window between two adjacent OFDM symbols.
  • FIG. 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the terminal device 900 includes a processor 901 and a memory 902.
  • the processor 901 and the memory 902 can pass through a communication bus.
  • the communication bus 903 may be a Peripheral Component Interconnect (PCI for short) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA for short) bus or the like.
  • the communication bus 903 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 9, but it does not mean that there is only one bus or one type of bus.
  • the memory 902 is used to store a computer program, the computer program includes program instructions, and the processor 901 is configured to invoke the program instructions, and the above-mentioned program includes for executing the methods shown in FIGS. 3 to 6 .
  • the processor 901 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs in the above solutions.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • Memory 902 may be read-only memory (ROM) or other type of static storage device that can store static information and instructions, random access memory (RAM) or other type of static storage device that can store information and instructions It can also be an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being executed by a computer Access any other medium without limitation.
  • the memory can exist independently and be connected to the processor through a bus.
  • the memory can also be integrated with the processor.
  • the terminal device 900 may also include common components such as a communication interface 904 and an antenna, which will not be described in detail here.
  • the terminal device may perform an up-window processing and a down-window processing in the windowing time domain to obtain an up-window and a down-window
  • the rising window is processed to make the rising window discontinuous in the windowing time domain.
  • adding the falling window processing makes the falling window discontinuous in the windowing time domain, so that when the first OFDM symbol and the second OFDM symbol undergo different amplitude gains, the rising window is continuous in the windowing time domain, and the falling window is continuous in the windowing time domain. It is continuous in the windowed time domain, and the time domain windowing can still achieve the expected out-of-band radiation suppression effect, which can reduce the out-of-band leakage caused by the overlapping of windowing between two adjacent OFDM symbols.
  • FIG. 10 is a schematic structural diagram of a baseband chip provided by an embodiment of the present application.
  • the baseband chip 1000 may further include a processing module 1001 and an interface 1002.
  • the processing module 1001 obtains program instructions through the interface 1002, and the processing module 1001 is configured to call the program instructions.
  • the program includes methods for performing the methods shown in FIGS. 3 to 6 .
  • the interface 1002 can obtain program instructions from the external memory, and can also obtain program instructions from the internal memory of the baseband chip 1000.
  • the processing module in the embodiment of the present application can realize the generation and modulation of baseband signals, can generate OFDM symbols, and perform cyclic prefixing and windowing processing on the OFDM symbols.
  • Embodiments of the present application further provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute any one of the time-domain processing methods described in the foregoing method embodiments. Some or all of the steps of the window method.
  • Embodiments of the present application further provide a computer program product, where the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program enables a computer to execute any one of the time-domain processing methods described in the foregoing method embodiments. Some or all of the steps of the window method.
  • the disclosed apparatus may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or Integration into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware, and can also be implemented in the form of software program modules.
  • the integrated unit if implemented in the form of a software program module and sold or used as a stand-alone product, may be stored in a computer readable memory.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art, or all or part of the technical solution, and the computer software product is stored in a memory.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • the aforementioned memory includes: U disk, read-only memory (ROM), random access memory (random access memory, RAM), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Est divulgué un procédé de fenêtrage dans le domaine temporel et un produit associé. Le procédé de fenêtrage dans le domaine temporel consiste : à effectuer un traitement d'ajout de fenêtre montante dans un domaine temporel de fenêtrage, de façon à obtenir une fenêtre montante constituée d'une première partie de fenêtre montante et d'une seconde partie de fenêtre montante, et à effectuer un traitement d'ajout de fenêtre descendante dans le domaine temporel de fenêtrage, de façon à obtenir une fenêtre descendante constituée d'une première partie de fenêtre descendante et d'une seconde partie de fenêtre descendante, l'amplitude de la fenêtre montante étant discontinue dans le domaine temporel de fenêtrage, et l'amplitude de la fenêtre descendante étant discontinue dans le domaine temporel de fenêtrage, de sorte que pendant l'envoi par interface radio, après qu'un premier symbole OFDM et un second symbole OFDM ont été soumis à des gains d'amplitude différents, l'amplitude de la fenêtre montante est continue dans le domaine temporel de fenêtrage, et l'amplitude de la fenêtre descendante est continue dans le domaine temporel de fenêtrage. Au moyen des modes de réalisation de la présente demande, une fuite hors bande provoquée par le fenêtrage et le chevauchement entre deux symboles OFDM adjacents peut être réduite.
PCT/CN2020/104828 2020-07-27 2020-07-27 Procédé de fenêtrage dans le domaine temporel et produit associé WO2022020993A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115102820A (zh) * 2022-06-09 2022-09-23 Oppo广东移动通信有限公司 处理信号的方法及相关装置
WO2024113323A1 (fr) * 2022-12-01 2024-06-06 华为技术有限公司 Procédé et dispositif de transmission de signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109076047A (zh) * 2016-05-11 2018-12-21 华为技术有限公司 一种信号处理方法及发射机
US20200007361A1 (en) * 2018-06-29 2020-01-02 Nokia Technologies Oy Discontinuous Fast-Convolution Based Filter Processing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109076047A (zh) * 2016-05-11 2018-12-21 华为技术有限公司 一种信号处理方法及发射机
US20200007361A1 (en) * 2018-06-29 2020-01-02 Nokia Technologies Oy Discontinuous Fast-Convolution Based Filter Processing

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
FAN, RONG ET AL.: "DFT-based Pilot-Symbol-Aided Channel Estimation in OFDM Systems", JOURNAL OF NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS (NATURAL SCIENCE EDITION), vol. 35, no. 2, 30 April 2015 (2015-04-30), pages 79 - 83, XP055890668 *
INTEL CORPORATION: "R1-164177 Link-level evaluation of filtered/windowed OFDM", 3GPP TSG RAN WG1 MEETING #85, 27 May 2016 (2016-05-27), XP051090077 *
SAHIN, ALPHAN ET AL.: "Edge Windowing for OFDM Based Systems", IEEE COMMUNICATIONS LETTERS, vol. 15, no. 11, 30 November 2011 (2011-11-30), XP011369621, DOI: 10.1109/LCOMM.2011.090611.111530 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115102820A (zh) * 2022-06-09 2022-09-23 Oppo广东移动通信有限公司 处理信号的方法及相关装置
WO2023236495A1 (fr) * 2022-06-09 2023-12-14 Oppo广东移动通信有限公司 Procédé de traitement de signal et appareil associé
WO2024113323A1 (fr) * 2022-12-01 2024-06-06 华为技术有限公司 Procédé et dispositif de transmission de signal

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