WO2021027901A1 - 数据传输方法及其装置 - Google Patents

数据传输方法及其装置 Download PDF

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Publication number
WO2021027901A1
WO2021027901A1 PCT/CN2020/109013 CN2020109013W WO2021027901A1 WO 2021027901 A1 WO2021027901 A1 WO 2021027901A1 CN 2020109013 W CN2020109013 W CN 2020109013W WO 2021027901 A1 WO2021027901 A1 WO 2021027901A1
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Prior art keywords
bandwidth
data stream
data
processing
indication information
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PCT/CN2020/109013
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English (en)
French (fr)
Inventor
袁世通
刘凤威
黄煌
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华为技术有限公司
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Publication of WO2021027901A1 publication Critical patent/WO2021027901A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • 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
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • 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
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • 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
    • H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the embodiments of the present application relate to the field of communication technology, and in particular to a data transmission method and device.
  • the wireless signal observed in the time domain is a sine wave with constantly changing amplitude, and the amplitude is not constant.
  • the peak amplitude of the signal in one cycle is different from the peak amplitude in other cycles, so the average power and peak power of each cycle are different.
  • the peak power is the maximum transient power that appears with a certain probability, usually this probability is 0.01%.
  • the ratio of the peak power under this probability to the total average power of the system is the peak-to-average power ratio ( peak to average power ratio, PAPR), referred to as peak-to-average ratio.
  • the signal of the wireless communication system is sent to a distant place, and power amplification is required. Since the dynamic range of a general power amplifier is limited, a signal with a large PAPR can easily enter the non-linear region of the power amplifier, resulting in non-linear distortion of the signal, and a serious degradation of the performance of the entire system. Therefore, how to reduce the PAPR of the signal is a technical problem to be solved urgently.
  • the embodiments of the present application provide a data transmission method and device, which can reduce the PAPR of transmitted data.
  • the first aspect of the embodiments of the present application provides a data transmission method, including:
  • the first data stream is filtered to obtain a second data stream.
  • the bandwidth corresponding to the first data stream is the first bandwidth
  • the bandwidth corresponding to the second data stream is the second bandwidth
  • the second bandwidth is smaller than the first bandwidth
  • the sending end in order to process the bit stream at the sending end, may be a network device or a terminal device.
  • the filtering process makes the second bandwidth smaller than the first bandwidth, thereby reducing the PAPR of the transmitted data.
  • the second data stream is processed to obtain the transmission data stream, and the transmission data stream is sent.
  • the bandwidth of the transmission data stream is smaller than the bandwidth of the bit stream, thereby reducing the PAPR of the transmission data stream.
  • the first data stream includes a plurality of first data, and each first data carries n bits, and n is a positive integer greater than 1, which can improve spectrum efficiency.
  • the terminal device or network device modulates the bit stream using a modulation method to obtain a modulated data stream.
  • the modulated data stream includes multiple modulated data, and the modulated data is a real number; the modulated data stream is phase-rotated, Obtain a first data stream, and part of the first data included in the first data stream is a complex number. Perform modulation and phase rotation to suppress PAPR.
  • the modulation method can be 4th order, 8th order or higher order pulse amplitude modulation. If the modulation method is 4th order pulse amplitude modulation, then each first data carries 2 bits; if the modulation method is 8th order pulse amplitude modulation , Then each first data carries 3 bits; if the modulation mode is 16-order pulse amplitude modulation, then each first data carries 4 bits.
  • the phase rotation factor of phase rotation can be expressed as e k ⁇ j ⁇ , where ⁇ is the phase, which can be ⁇ /2 or ⁇ /4, etc.; k is the index of the modulation data, which can be numbered from "0", or Numbering starts from "1". If the sending end is a network device, the network device can inform the terminal device of the modulation method it uses; if the sending end is a terminal device, the terminal device can modulate the bit stream using the modulation method indicated by the network device.
  • the terminal device may receive first processing instruction information before modulating and phase rotating the first bit stream.
  • the first processing instruction information is used to indicate the modulation mode for modulating the bit stream, according to This modulation method modulates and rotates the bit stream.
  • the first processing instruction information may be configured by the network device for the terminal device, and the terminal device modulates and phase-rotates the first bit stream according to the first processing instruction information, so that the network device can perform corresponding demodulation when receiving the transmission data stream.
  • the transmitting end of the transmission data stream is a terminal device
  • the receiving end of the transmission data stream is a network device
  • the terminal device sends the transmission data stream to the network device, which corresponds to an uplink transmission scenario.
  • the terminal device modulates the bit stream using the modulation method indicated by the first processing instruction information to obtain a modulated data stream.
  • the modulated data stream includes multiple modulated data, and the modulated data is a real number; the modulated data stream is phase-rotated to obtain the first data Stream, part of the first data included in the first data stream is a complex number. Perform modulation and phase rotation to suppress PAPR.
  • the terminal device can perform modulation according to the modulation method indicated by the first processing instruction information, or according to the default modulation method.
  • the default modulation method may be agreed upon by the protocol, or the network device may notify the terminal device in advance through other methods of.
  • the terminal device may receive second processing instruction information, where the second processing instruction information is used to indicate a parameter for filtering the first data stream, namely Used to indicate how to filter the first data stream.
  • the terminal device performs filtering processing on the first data stream according to the second processing instruction information to obtain the second data stream.
  • the filtering processing implements frequency domain truncation so that the bandwidth of the second data stream is smaller than the bandwidth of the first data stream, which is beneficial to reduce PAPR.
  • the second processing instruction information and the foregoing first processing instruction information may be carried in the same message, or may be carried in different messages.
  • the network device can notify the terminal device of its filtering processing parameters; if the sending end is a terminal device, the terminal device can perform filtering processing according to the second processing instruction information sent by the network device.
  • the above-mentioned second processing indication information includes one or more of the first bandwidth indication information, the second bandwidth indication information, or the ratio between the first bandwidth and the second bandwidth, where the first A bandwidth indication information is used to indicate the first bandwidth, and the second bandwidth indication information is used to indicate the second bandwidth and/or the center frequency of the second bandwidth.
  • the first data stream is frequency-domain truncated according to the first bandwidth and the second bandwidth, so that the bandwidth of the second data stream is the second bandwidth.
  • the second bandwidth is determined according to the first bandwidth and the ratio, and frequency domain truncation is performed, so that the bandwidth of the second data stream is the second bandwidth.
  • the first bandwidth is determined according to the second bandwidth and the ratio, and the first data stream of the first bandwidth is truncated in the frequency domain so that the second data The bandwidth of the stream is the second bandwidth.
  • the first bandwidth or the second bandwidth can be predefined, and the frequency domain truncation is performed according to the predefined first bandwidth or the second bandwidth and the ratio, so that the second data stream
  • the bandwidth of is the second bandwidth.
  • the ratio between the first bandwidth and the second bandwidth may be predefined, and the frequency domain truncation is performed according to the first bandwidth or the second bandwidth and the ratio, so that the first bandwidth The bandwidth of the second data stream is the second bandwidth.
  • the above-mentioned second processing indication information is used to indicate the filter parameter, and the filter parameter includes a roll-off factor, and frequency domain data is truncated according to the roll-off factor, so that the second bandwidth is smaller than the first bandwidth.
  • the roll-off factor may not be indicated by the second processing instruction information, for example, it is predefined.
  • the method further includes receiving transmission resource indication information, where the transmission resource indication information is used to indicate a time domain resource, and the transmission data stream is sent on the time-frequency resource.
  • the transmission data stream is sent through the time domain resource indicated by the transmission resource indication information.
  • the transmission resource indication information and the first processing indication information and the second processing indication information may be carried in the same message, or the transmission resource indication information and the first processing indication information or the second processing indication information may be carried in the same message, or The three indications are carried in different messages.
  • a second aspect of the embodiments of the present application provides a data transmission method, including:
  • the bandwidth of the third data stream is the third bandwidth
  • the bandwidth of the fourth data stream is the fourth bandwidth
  • the third bandwidth is smaller than the fourth bandwidth
  • the transmission data stream is received, and the transmission data stream is processed to obtain the third data stream.
  • the receiving end may be a network device or a terminal device.
  • the transmission data stream received by the receiving end has low PAPR, and processing such as inverse filtering, de-phase rotation and demodulation can be performed to restore the bit stream sent by the transmitting end.
  • the third processing instruction information is received, and the inverse filtering processing is performed on the third data stream according to the third processing instruction information.
  • the third processing instruction information may be configured by the network device for the terminal device, and is used to inform the terminal device how to perform filtering processing.
  • the transmitting end of the transmission data stream is a network device
  • the receiving end of the transmission data stream is a terminal device, which is a process in which the terminal device receives data from the network device and processes it, which corresponds to a downlink transmission scenario.
  • the above-mentioned third processing indication information includes one or more of the third bandwidth indication information, the fourth bandwidth indication information, or the ratio between the third bandwidth and the fourth bandwidth, where the first The fourth bandwidth indication information is used to indicate the fourth bandwidth, and the third bandwidth indication information is used to indicate the third bandwidth and/or the center frequency of the third bandwidth.
  • the foregoing third processing indication information is used to indicate the second filter parameter, and the second filter parameter includes a second roll-off factor, and the second roll-off factor may be the same as the first roll-off factor, or Not the same.
  • the method further includes receiving fourth processing instruction information, where the fourth processing instruction information is used to indicate which modulation method is used for demodulation.
  • the terminal device performs dephase rotation and demodulation on the fourth data stream according to the fourth processing instruction information to restore the bit stream sent by the transmitting end.
  • the fourth processing instruction information and the third processing instruction information can be carried in the same message or in different messages.
  • the terminal device may perform demodulation according to the modulation mode indicated by the fourth processing instruction information, or perform demodulation according to the default modulation mode, and the default modulation mode may be agreed upon by the protocol.
  • the method further includes receiving transmission resource indication information, where the transmission resource indication information is used to indicate a time-frequency resource, and the transmission data stream is received on the time-frequency resource.
  • the transmission resource indication information instructs the network device to send the time-frequency resource of the transmission data stream, so that the terminal device can receive the transmission data stream on the time-frequency resource.
  • the transmission resource indication information and the third processing indication information and the fourth processing indication information may be carried in the same message, or the transmission resource indication information and the third processing indication information or the fourth processing indication information may be carried in the same message, or The three indications are carried in different messages.
  • the third aspect of the embodiments of the present application provides a data transmission method, including:
  • the second data stream is processed to obtain the transmission data stream, and the transmission data stream is sent.
  • the bit stream to be sent may be the bit stream of the pilot signal.
  • performing power extension and phase rotation on the first data stream to obtain the second data stream includes: performing power extension on the first data stream to obtain a power extension data stream, and the power extension data stream includes multiple The power expansion data is a real number; the power expansion data stream is phase-rotated to obtain the second data stream.
  • performing power expansion and phase rotation on the first data stream to obtain the second data stream includes: performing phase rotation on the first data stream to obtain a phase-rotated data stream, and the phase-rotated data stream includes multiple Part of the phase rotation data included in the phase rotation data is a complex number; performing power expansion on the phase rotation data stream to obtain a second data stream.
  • the fourth aspect of the embodiments of the present application provides a data transmission device.
  • the device may be a terminal device, or a device in a terminal device, such as a chip, or a device that can be matched and used with the terminal device.
  • the device may include a module corresponding to the method/operation/step/action described in the first aspect or the third aspect, and the device may also include a module for performing the method/operation/step/action described in the second aspect.
  • the module can be a hardware circuit, software, or hardware circuit combined with software.
  • the device may include a transceiver module and a processing module.
  • the processing module is configured to modulate and phase rotate the bit stream to obtain a first data stream; filter the first data stream to obtain a second data stream, and the bandwidth corresponding to the first data stream is the first bandwidth , The bandwidth corresponding to the second data stream is the second bandwidth, and the second bandwidth is smaller than the first bandwidth; the second data stream is processed to obtain the transmission data stream; the transceiver module is used to send the transmission data stream.
  • the first data stream includes a plurality of first data, and each first data carries n first bits, and n is a positive integer greater than 1.
  • a transceiver module is used to receive a transmission data stream; a processing module is used to process the transmission data stream to obtain a third data stream; perform inverse filtering processing on the third data stream to obtain fourth data
  • the bandwidth of the third data stream is a third bandwidth
  • the bandwidth of the fourth data stream is a fourth bandwidth
  • the third bandwidth is smaller than the fourth bandwidth; dephasing the fourth data stream Rotate and demodulate to get the bit stream.
  • the processing module is configured to modulate the bit stream to be sent to obtain a first data stream.
  • the first data stream includes a plurality of first data, and the first data is a real number; performing power expansion and phase rotation on the first data stream To obtain a second data stream, where part of the second data included in the second data stream is a complex number; process the second data stream to obtain a transmission data stream; the transceiver module is used to send the transmission data stream.
  • the device provided by the fourth aspect may also be a network device, or a device in the network device, for example, a chip, or a device that can be used in matching with the network.
  • a fifth aspect of the embodiments of the present application provides a data transmission device, which includes a processor, configured to implement the method described in the first, second, or third aspect.
  • the device may also include a memory for storing instructions and data.
  • the memory is coupled with the processor, and when the processor executes the computer program or instruction stored in the memory, the device can realize the method described in the first aspect, the second aspect, or the third aspect.
  • the device may also include a transceiver, which is used for the device to communicate with other devices.
  • the transceiver may be a communication interface, circuit, bus, module, etc., and other devices may be network devices.
  • the device includes: a memory for storing computer programs or instructions; a processor for modulating and phase rotating the bit stream to obtain a first data stream; and filtering the first data stream , Get the second data stream, the bandwidth corresponding to the first data stream is the first bandwidth, the bandwidth corresponding to the second data stream is the second bandwidth, and the second bandwidth is smaller than the first bandwidth; the second data stream is processed to obtain the transmission data Stream; Transceiver, used to send transmission data stream.
  • the first data stream includes a plurality of first data, and each first data carries n first bits, and n is a positive integer greater than 1.
  • the device includes a processor, a transceiver, and a memory.
  • the memory is used to store computer programs or instructions; the transceiver is used to receive the transmission data stream; the processor is used to process the transmission data stream to obtain a third data stream; perform inverse filtering on the third data stream Processing to obtain a fourth data stream, the bandwidth of the third data stream is a third bandwidth, the bandwidth of the fourth data stream is a fourth bandwidth, and the third bandwidth is smaller than the fourth bandwidth;
  • the four data streams are subjected to phase rotation and demodulation to obtain a bit stream.
  • the device includes a processor, a transceiver, and a memory.
  • the memory is used to store computer programs or instructions;
  • the processor is used to modulate the bit stream to be sent to obtain a first data stream, the first data stream includes a plurality of first data, and the first data is a real number;
  • the first data stream is Perform power expansion and phase rotation to obtain a second data stream, where part of the second data included in the second data stream is a complex number; process the second data stream to obtain a transmission data stream; a transceiver for sending the transmission data stream.
  • the device includes a processor and an interface.
  • the processor is coupled with the memory through the interface.
  • the device executes the first aspect, the second aspect, or the first aspect.
  • the device provided in the fifth aspect may also be a network device, and the transceiver included in the device is used for the device to communicate with the terminal device.
  • a sixth aspect of the embodiments of the present application provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method provided in the first, second, or third aspect.
  • the seventh aspect of the embodiments of the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the method provided in the first aspect, the second aspect, or the third aspect.
  • An eighth aspect of the embodiments of the present application provides a chip, which includes at least one processor and an interface, and is used to call and run a computer program stored in the memory from the memory, so that the above-mentioned first, second, or third aspect is The provided method is executed.
  • the processor is configured to modulate and phase rotate the bit stream to obtain a first data stream; filter the first data stream to obtain a second data stream, and the bandwidth corresponding to the first data stream is the first bandwidth The bandwidth corresponding to the second data stream is the second bandwidth, and the second bandwidth is smaller than the first bandwidth; the transmission data stream is processed to obtain the transmission data stream; the interface is used to output the transmission data stream.
  • Figure 1 is a schematic diagram of a network architecture to which an embodiment of the present application is applied;
  • FIG. 2 is a schematic diagram of the processing flow of DFTs-OFDM technology
  • Figure 3 is the coordinate diagram of BPSK and ⁇ /2-BPSK
  • Figure 4a is a schematic flowchart of a data sending method
  • Figure 4b is a schematic diagram of simulation results based on Figure 4a;
  • FIG. 5 is a schematic flowchart of a data sending method provided by an embodiment of the application.
  • Fig. 6 is a diagram of a modulation example of ⁇ /2-4-PAM provided by an embodiment of the application.
  • FIG. 7 is an example diagram of frequency domain truncation and frequency domain expansion provided by an embodiment of this application.
  • FIG. 8 is a schematic diagram of simulation results based on FIG. 7;
  • FIG. 9 is a schematic diagram of a simulation result provided by an embodiment of this application.
  • FIG. 10 is a schematic flowchart of a data receiving method provided by an embodiment of this application.
  • FIG. 10a is a schematic diagram of inverse filtering processing provided by an embodiment of the application.
  • FIG. 11 is a schematic diagram of an interaction flow of uplink data transmission provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of an interactive flow of downlink data transmission provided by an embodiment of this application.
  • FIG. 12a is a schematic diagram of the positions of conjugate symmetry points and redundant data provided by an embodiment of this application.
  • FIG. 13 is an example constellation diagram of power extension provided by an embodiment of this application.
  • FIG. 14 is a schematic structural diagram of a device provided by an embodiment of this application.
  • 15 is a schematic structural diagram of a terminal device provided by an embodiment of this application.
  • FIG. 16 is a schematic structural diagram of another device provided by an embodiment of this application.
  • At least one item (a) refers to any combination of these items, including any combination of a single item (a) or plural items (a).
  • at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.
  • words such as “first” and “second” are used to distinguish technical features that have substantially the same or similar functions and functions. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and order of execution, and words such as “first” and “second” do not limit the difference.
  • Embodiments of the present application may be applied to the LTE system (term evolution, LTE long); can also be applied to the fifth generation (5 th -generation, 5G) communication system, 5G communication system may also be referred to as a new air interface (new radio , NR) system; can also be applied to future communication systems, such as future networks or sixth-generation communication systems.
  • LTE long
  • 5G communication system may also be referred to as a new air interface (new radio , NR) system
  • future communication systems such as future networks or sixth-generation communication systems.
  • the embodiments of the present application can be applied to a device to device (D2D) system, a machine to machine (M2M) system, a vehicle to everything (V2X) system in which vehicles communicate with everything, etc.
  • D2D device to device
  • M2M machine to machine
  • V2X vehicle to everything
  • the embodiments of the present application can be applied to various scenarios, such as next-generation microwave scenarios, NR-based microwave scenarios, or integrated access backhaul (IAB) scenarios.
  • next-generation microwave scenarios such as next-generation microwave scenarios, NR-based microwave scenarios, or integrated access backhaul (IAB) scenarios.
  • IAB integrated access backhaul
  • FIG. 1 is a schematic diagram of a network architecture to which an embodiment of the present application is applied.
  • the network architecture may include one network device and one terminal device.
  • the number and form of the devices shown in FIG. 1 are used as examples and do not constitute a limitation to the embodiment of the present application.
  • Actual applications may include two or more network devices. Two or more terminal devices.
  • the network device can be any device with a wireless transceiver function. Including but not limited to: evolutional Node B (evolutional Node B, NodeB or eNB or e-NodeB) in LTE, base station (gNodeB or gNB) or transmission receiving point/transmission reception point (TRP) in NR, 3GPP Subsequent evolution of base stations, access nodes in the WiFi system, wireless relay nodes, wireless backhaul nodes, etc.
  • the base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. Multiple base stations can support networks of the same technology mentioned above, or networks of different technologies mentioned above.
  • the base station can contain one or more co-site or non-co-site TRPs.
  • the network device may also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the network device can also be a server, a wearable device, or a vehicle-mounted device.
  • the following description takes the network device as a base station as an example.
  • the multiple network devices may be base stations of the same type, or base stations of different types.
  • the base station can communicate with the terminal, and it can also communicate with the terminal through a relay station.
  • the terminal can communicate with multiple base stations of different technologies.
  • the terminal can communicate with a base station that supports an LTE network, or can communicate with a base station that supports a 5G network, and can also support dual connections with a base station of an LTE network and a base station of a 5G network. .
  • a terminal device is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (such as airplanes, Balloons and satellites are classy).
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, an industrial control ( Wireless terminals in industrial control, in-vehicle terminal equipment, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety (transportation) Wireless terminals in safety), wireless terminals in smart cities, wireless terminals in smart homes, wearable terminal devices, and so on.
  • the embodiment of this application does not limit the application scenario.
  • Terminals can sometimes be referred to as terminal equipment, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile Equipment, UE terminal equipment, wireless communication equipment, UE agent or UE device, etc.
  • the terminal device can also be fixed or mobile.
  • the embodiments of the present application can be applied to scenarios where data is transmitted between a network device and a terminal device, and can be a downlink transmission scenario or an uplink transmission scenario.
  • Orthogonal frequency division multiplexing with discrete Fourier transform spreading (discrete Fourier transform spreading orthogonal frequency division multiplexing, DFTs-OFDM)
  • DFTs-OFDM technology is one of the long term evolution (LTE) uplink signal generation methods.
  • DFTs-OFDM technology has an additional discrete Fourier transform (DFT) processing before the traditional orthogonal frequency division multiplexing (OFDM) processing, so DFTs-OFDM technology can also be called It is a linear precoding OFDM technology.
  • DFT-s-OFDM technology is also called single carrier-frequency division multiple access (SC-FDMA).
  • FIG. 2 is a schematic diagram of the processing flow of the DFTs-OFDM technology.
  • the transmitter performs serial-to-parallel conversion, N-point DFT, subcarrier mapping, M-point inverse discrete Fourier transform (IDFT), and parallel-to-parallel conversion to the time-domain discrete sequence. to-serial) conversion, cyclic prefix (CP) and digital-to-analog converter (DAC) processing to obtain the transmission data stream, and then the transmission data stream is sent to the receiving end through the antenna port and channel .
  • serial-to-parallel conversion N-point DFT, subcarrier mapping, M-point inverse discrete Fourier transform (IDFT), and parallel-to-parallel conversion to the time-domain discrete sequence.
  • to-serial conversion
  • CP cyclic prefix
  • DAC digital-to-analog converter
  • the receiving end When the receiving end receives the transmission data stream through the channel and the antenna port, it sequentially performs analog to digital converter (ADC), de-cyclic prefix, serial-to-parallel conversion, and M Point DFT, de-subcarrier mapping/equalization, N-point IDFT, and parallel-to-serial conversion to obtain a discrete sequence in the time domain.
  • ADC analog to digital converter
  • de-cyclic prefix serial-to-parallel conversion
  • M Point DFT de-subcarrier mapping/equalization
  • N-point IDFT de-subcarrier mapping/equalization
  • parallel-to-serial conversion to obtain a discrete sequence in the time domain.
  • the transmitter can obtain the frequency domain sequence of the time domain discrete sequence through the N-point DFT. After mapping the frequency domain sequence sub-carriers, input IDFT to perform M-point IDFT, N ⁇ M. Since the length of IDFT is greater than the length of DFT, the input part with more IDFT is filled with zeros. After IDFT, adding a cyclic prefix can avoid symbol interference.
  • the PAPR of the output transmission data stream is lower than the PAPR using OFDM technology, which can improve the power transmission efficiency of the terminal equipment, extend the battery life, and reduce the cost of the terminal equipment.
  • the group of discrete time-domain data signals may be the time-domain data signals with the cyclic prefix added in FIG. 2, and the analog continuous signal output by the DAC may be the transmission data stream output by the DAC in FIG. 2.
  • PAPR 1 and PAPR 2 respectively. If d(n) is a set of designed weight coefficient sequences, then the correlation between adjacent data in yd(n) is better than the correlation between adjacent data in y(n). Therefore, PAPR1 is less than PAPR2. Therefore, after a set of discrete time-domain data is convolved with a designed set of discrete data, PAPR can be effectively reduced.
  • the convolution operation of two time-domain signals can be equivalent to the point multiplication operation of the two time-domain signals in the frequency domain. Therefore, a set of discrete time-domain data is converted into discrete frequency-domain data after DFT, and then the designed spectrum shaping sequence is multiplied, and the time domain signal after IDFT can effectively reduce PAPR. Since the complexity of the dot product operation is lower than that of the convolution operation, this PAPR reduction technique operates better in the frequency domain, so this technique is called frequency domain shaping.
  • Dot multiplication operation generally refers to the corresponding multiplication of elements in two vector sequences or matrices. After the operation, a vector or matrix with the same dimension as before the dot product operation can be obtained.
  • ⁇ /2-BPSK modulation is an enhancement of BPSK modulation.
  • the phase difference between the input bit "1" and the input bit “0” is ⁇ or - ⁇ , that is, the absolute value of the phase difference is ⁇ .
  • the phase difference between the kth modulation symbol and the k-1th modulation symbol is ⁇ /2 or - ⁇ /2, that is, the absolute value of the phase difference is ⁇ /2.
  • the first modulation symbol is selected from ⁇ +1, -1 ⁇ according to the first input bit "1" or “0", for example, if the first input bit is "1", select +1, and the second If one input bit is "0", select -1; the second modulation symbol is selected according to the second input bit in ⁇ +j, -j ⁇ , for example, if the second input bit is "1", select +j, and the second If the input bit is "0", select -j; the third modulation symbol is selected from ⁇ +1, -1 ⁇ according to the third input bit, and the fourth modulation symbol is ⁇ +j, according to the fourth input bit. -j ⁇ choose one, and so on.
  • the kth modulation symbol is any modulation symbol in the modulation symbol stream, and ⁇ is the pi.
  • the input bit "1" ⁇ "0" or “0" ⁇ ”1" will have a phase mutation with the absolute value of ⁇ during the conversion process, which will cause the PAPR of the signal to increase.
  • the absolute value of the phase difference between two adjacent modulation symbols is ⁇ /2, from ⁇ to ⁇ /2, which can suppress the PAPR of the signal.
  • Pulse amplitude modulation Pulse Amplitude Modulation
  • PAM is a modulation method in which a series of analog signals are sampled and modulated with pulse signals, thereby cutting the amplitude of the original signal. This is an analog pulse modulation method.
  • the original signal is carried on a serial pulse carrier.
  • the time interval between the carriers is fixed, and the value of the pulse carrier depends on the amplitude of the original signal.
  • the demodulation of PAM is to detect the amplitude of each pulse carrier and restore it.
  • the modulation result obtained by using BPSK can be equivalent to the modulation result obtained by using a PAM with a modulation order of 2.
  • Figure 4a is a schematic flowchart of a data sending method.
  • the transmitting end modulates the input information bits according to the BPSK modulation method, performs phase rotation of ⁇ /2 on the modulated symbols, performs DFT on the symbols after phase rotation, performs IFFT on the symbols after DFT, and adds cycles to the symbols after IFFT Prefix, send the data with the cyclic prefix added to the receiving end.
  • FDSS can be performed on the symbols after DFT
  • IFFT can be performed on the symbols after FDSS, which can reduce PAPR.
  • the FDSS in Fig. 4a generally uses a spectrum-expanded raised cosine roll-off filter, and the bandwidth occupied by the symbols after expansion is 1+ ⁇ times the original bandwidth, where ⁇ is the filter roll-off factor.
  • ⁇ is the filter roll-off factor.
  • the original bandwidth is 10MHz
  • FDSS with ⁇ 0.2
  • the occupied bandwidth is 12MHz.
  • the FDSS in FIG. 4a may also use a root raised cosine roll-off filter with spectrum expansion, etc., to implement spectrum expansion, and the specific filter used is not limited in the embodiment of the present application.
  • Figure 4b is a schematic diagram of the simulation results based on Figure 4a.
  • the abscissa represents the PAPR of the transmitted data
  • the ordinate represents the complementary cumulative distribution function (CCDF) of the PAPR of the transmitted data.
  • CCDF complementary cumulative distribution function
  • curve 1 is the CCDF of the PAPR of the transmitted data obtained by DFTs-OFDM+FDSS
  • curve 2 is when the data modulation mode is BPSK modulation, adopt The CCDF of the PAPR of the transmitted data obtained by DFTs-OFDM+FDSS
  • curve 3 is the CCDF of the PAPR of the transmitted data obtained by DFTs-OFDM when the data modulation method is ⁇ /2-BPSK modulation
  • 4 is the data modulation method is In BPSK modulation, the CCDF of the PAPR of the transmitted data obtained by DFTs-OFDM is used.
  • the embodiments of the present application provide a data transmission method and device.
  • Frequency domain filtering is used to reduce the PAPR of transmitted data.
  • Frequency domain filtering can make the bandwidth occupied by the transmitted data smaller than the configured bandwidth, which can improve the frequency domain resources. Utilization rate.
  • the modulation data in the embodiment of the present application carries two or more bits, which can improve the spectrum efficiency.
  • FIG. 5 is a schematic flowchart of a data sending method provided by an embodiment of this application.
  • the data sending method shown in FIG. 5 is executed by the sending end.
  • the sending end may be a network device in the network architecture shown in FIG. 1 or a terminal device in the network architecture shown in FIG. 1.
  • the process shown in Figure 5 may include but is not limited to the following steps:
  • Step 101 Perform modulation and phase rotation on the first bit stream to obtain the first data stream.
  • the sending end modulates and rotates the first bit stream to obtain the first data stream.
  • the first data stream includes a plurality of first data, and each first data carries n first bits, and n is a positive integer greater than 1.
  • the modulation mode of modulation can be PAM, and its modulation order can be 4, 8, 16 or greater.
  • a PAM with a modulation order of 4 can be expressed as 4-PAM, 4PAM, PAM4, or PAM-4.
  • a PAM with a modulation order of 8, can be expressed as 8-PAM, 8PAM, PAM8, or PAM-8.
  • the specific method used for representation is not limited.
  • the embodiment of the present application takes N-PAM as an example, and N is the modulation order.
  • the modulation order is related to the number n of first bits carried by each first data.
  • the modulation order can be expressed as 2 n , and the superscript n is the number of first bits carried by each first data.
  • each first data can carry 2 first bits, and these 2 bits can represent 4 discrete pulse amplitudes.
  • the modulation order is 8, ie 8-PAM, each first data can carry 3 first bits, and these 3 bits can represent 8 discrete pulse amplitudes.
  • the transmitting end first modulates the first bit stream to obtain the first modulated data stream; then performs phase rotation on the first modulated data stream to obtain the first data stream.
  • the first bit stream may be an encoded bit stream, including multiple first bits, the first bit may be bit “1” or bit “0", then the first bit stream is composed of bit "1" and bit " For a group of bit streams composed of 0", the specific encoding method used for encoding is not limited in the embodiment of this application. Multiple refers to two or more.
  • the first bit stream can also be described as an input information bit stream, a bit stream to be sent, or a time-domain discrete sequence.
  • the first modulation data stream includes a plurality of first modulation data, and each first modulation data is a real number, that is, it does not include an imaginary part.
  • the first modulation data can also be described as first modulation symbols, and each first modulation symbol carries n first bits.
  • the modulation mode is 4-PAM, and each first modulation symbol carries 2 first bits.
  • the specific value of n is related to the modulation order.
  • each first modulation data is multiplied by the phase rotation factor to obtain the first data stream.
  • the phase rotation factor can represent e k ⁇ j ⁇ , ⁇ can be ⁇ /2 or ⁇ /4, etc., k represents the index of the first modulation data, and the index can be numbered from "0", or can be from "1" Start numbering.
  • the first first modulation data is multiplied by the phase rotation factor e 0 to obtain the first first data; the second first modulation data Multiply by the phase rotation factor e 1 ⁇ j ⁇ /2 to get the second first data; multiply the third modulation data by the phase rotation factor e 2 ⁇ j ⁇ /2 to get the third first data , And so on, you can get the first data stream.
  • the absolute value of the phase difference between two adjacent first modulation data can be ⁇ /2.
  • modulation + phase rotation can be considered as the modulation method of ⁇ /2-4-PAM.
  • the absolute value of the phase difference between two adjacent first modulation data can be ⁇ /4.
  • modulation + phase rotation can be considered as a ⁇ /4-4-PAM modulation method.
  • part of the first data included in the first data stream is a complex number.
  • Part of the first data may be odd-numbered first data in the first data stream, or even-numbered first data in the first data stream, depending on the numbering rule and phase rotation factor of the first data stream.
  • the first data stream can be regarded as a modulated data stream.
  • the modulated data stream includes two parts, one part is a real number (including only the real part), and the other part is a complex number ( Include only the imaginary part, or include the real and imaginary parts).
  • FIG. 6 is an example diagram of ⁇ /2-4-PAM modulation provided in an embodiment of this application.
  • the first bit stream includes the 8 first bits ⁇ 0,1,1,0,0,0,1,1 ⁇ .
  • 4-PAM modulation the amplitude of "00” is -3, the amplitude of "01” is -1, the amplitude of "11” is +1, and the amplitude of "10” is +3.
  • each amplitude in 4-PAM modulation is the amplitude before normalization.
  • Perform 4-PAM modulation on the first bit stream to obtain first modulation data.
  • the first modulation data includes ⁇ -1, +3, -3, +1 ⁇ , and it can be seen that the first modulation data are all real numbers.
  • the phase rotation factor is e k ⁇ j ⁇ /2
  • the first first modulation data -1 is multiplied by the phase rotation factor e 0 to obtain the first first data -1
  • the sixth includes ⁇ -1, +3j, +3, -j ⁇ . It can be seen that the first and third data in the first data are real numbers, and the second and fourth data are two complex numbers.
  • the first data includes ⁇ -1,+3j,+3,-j ⁇ . Based on the index of the first modulation data, it is numbered from "0". If the index of the first debugging data is numbered from "1", then the first data Including ⁇ -j,-3,+3j,+1 ⁇ . In this case, the first and third data in the first data are complex numbers, and the second and fourth data are real numbers.
  • the terminal device can modulate the first bit stream according to the modulation mode indicated by the network device, or modulate the first bit stream according to the modulation mode indicated by the network device And phase rotation will be specifically introduced in the embodiment shown in FIG. 11.
  • the network device can inform the terminal device of the modulation method that it modulates the first bit stream, or it can modulate and phase rotate the first bit stream.
  • the modulation method informs the terminal equipment, which will be specifically introduced in the embodiment shown in FIG. 12.
  • the sending end Before step 102, the sending end performs discrete Fourier transform on the first data stream. This is a common operation in this field. After the discrete Fourier transform, the time domain sequence is transformed to the frequency domain.
  • Step 102 Perform filtering processing on the first data stream to obtain a second data stream.
  • the sending end performs filtering processing on the first data stream after the discrete Fourier transform to obtain the second data stream.
  • the first data stream undergoes discrete Fourier transform into frequency domain data, the bandwidth corresponding to the frequency domain is the first bandwidth, the bandwidth corresponding to the second data stream is the second bandwidth, and the second bandwidth is smaller than the first bandwidth.
  • the second bandwidth is smaller than the first bandwidth, which can be understood as the effect of frequency domain truncation or frequency domain reduction.
  • the effect of filtering processing is to make the second bandwidth smaller than the first bandwidth.
  • the filtering processing can also be described as shaping processing, or truncation processing, that is, the truncation processing can realize that the second bandwidth is smaller than the first bandwidth.
  • shaping processing or truncation processing, that is, the truncation processing can realize that the second bandwidth is smaller than the first bandwidth.
  • truncation processing can realize that the second bandwidth is smaller than the first bandwidth.
  • One bandwidth, other technical names used to describe that the second bandwidth is smaller than the first bandwidth should fall within the protection scope of the embodiments of the present application.
  • the sending end performs truncation processing on the first data stream in the frequency domain. Specifically, the transmitting end first performs DFT on the first data stream to obtain the frequency domain data of the first data stream, and then performs filtering processing on the frequency domain data of the first data stream to obtain the second data stream.
  • the second data stream is Frequency domain data.
  • the filtering process can be implemented by FDSS, which is different from the FDSS in Figure 4a.
  • the FDSS can be called frequency truncation (frequency truncate, FT), and the FDSS in FIG. 4a implements frequency domain extension.
  • the transmitting end is a terminal device, and the transmission bandwidth configured by the network device for the terminal device is 10 MHz. After filtering processing by the FDSS, it occupies 8 MHz, and after processing according to the FDSS in Figure 4a, it occupies 12 MHz.
  • filtering processing in the frequency domain has a smaller amount of calculation and simple implementation. Because the filtering process in the frequency domain is multiplication, and the filtering process in the time domain is convolution. Performing filtering processing in the time domain may include: sequentially performing DFT and IFFT on the first data stream, and then convolving the filter function to obtain a second data stream, which is time-domain data. Time-domain filtering processing can also achieve frequency-domain truncation, which has the disadvantage of large calculation amount and relatively complicated implementation.
  • the terminal device can perform filtering processing on the first data stream according to an instruction of the network device, which will be specifically introduced in the embodiment shown in FIG. 12.
  • the network device instructs the terminal device to perform filtering parameters for filtering processing.
  • the filtering parameters include a roll-off factor.
  • the roll-off factor is used to describe the falling slope of the filter edge.
  • the roll-off factor can also be described as an expansion factor, represented by ⁇ , ⁇ is less than 1, for example, 0.2.
  • the terminal device performs filtering processing on the first data stream according to the indicated roll-off factor.
  • the network device can notify the terminal device of the relevant information about the filtering process, which will be introduced in the embodiment shown in FIG. 13.
  • step 102 also includes:
  • Step 103 Process the second data stream to obtain the first transmission data stream.
  • the sending end processes the second data to obtain the first transmission data stream.
  • This process is used to transform frequency domain data into time domain data.
  • the processing may be time-domain processing, and the time-domain processing may include IFFT as shown in FIG. 5 and adding a cyclic prefix.
  • the processing in step 103 in FIG. 5 includes IFFT and adding a cyclic prefix for example, and does not constitute a limitation to the embodiment of the present application.
  • adding a cyclic prefix may also include digital-to-analog conversion. That is, the processing in step 103 may include IFFT, adding cyclic prefix, and digital-to-analog conversion.
  • each process in the process shown in FIG. 5 is used as an example, and does not constitute a limitation to the embodiment of the present application.
  • subcarrier mapping may also be included before the IFFT.
  • Step 104 Send the first transmission data stream.
  • the sending end sends the first transmission data stream to the receiving end.
  • the receiving end receives the first transmission data stream from the sending end.
  • the bandwidth corresponding to the first transmission data stream is the bandwidth corresponding to the second data stream, which is smaller than the bandwidth corresponding to the first data stream, and the frequency domain truncation is realized.
  • the bandwidth corresponding to the first transmission data stream is the bandwidth finally occupied by the first transmission data stream
  • the bandwidth corresponding to the first data stream is the bandwidth occupied by the modulation data stream mapped to the frequency domain.
  • the transmitting end implements frequency domain truncation through filtering processing, so that the bandwidth occupied by the first transmission data stream is smaller than the bandwidth of the modulation data stream mapped to the frequency domain, and the bandwidth of the first transmission data stream can be reduced.
  • PAPR PAPR
  • a high-order ⁇ /2-PAM modulation method is adopted, so that a debugging symbol can carry n first bits, thereby improving the spectrum efficiency.
  • Example 1 In the embodiment of the present application, ⁇ /2-4-PAM is used, and ⁇ /2-4-PAM is compared with 16-quadrature amplitude modulation (QAM).
  • QAM 16-quadrature amplitude modulation
  • each modulation symbol carries 4 bits
  • ⁇ /2-4-PAM each modulation symbol carries 2 bits. It can be seen that the number of bits carried by each modulation symbol in 16-QAM is ⁇ /2-4 -Twice the PAM. Therefore, when the number of bits in the input bit stream is the same, the bandwidth occupied by modulation symbols after being mapped to the frequency domain is twice that of 16-QAM.
  • ⁇ /2-4-PAM+FDSS performs frequency domain truncation
  • 16-QAM+FDSS performs frequency domain extension, so that the final occupied bandwidth of the two is the same.
  • the bandwidth in Table 1 is based on physical resource blocks. (physical resource block, PRB) is the unit.
  • modulation symbol is mapped to the bandwidth of the frequency domain Frequency domain truncated/expanded bandwidth ⁇ /2-4-PAM 100PRB 60PRB 16-QAM 50PRB 60PRB
  • the roll-off factor ⁇ 0.2.
  • 50PRB*1.2 60PRB.
  • a filter with a roll-off factor of 0.2 is used to make 100PRB ⁇ 60PRB.
  • FIG. 7 the bandwidth of the frequency domain data is the bandwidth of the modulation symbol mapped to the frequency domain, and the bandwidth of the output data is the bandwidth after frequency domain truncation/expansion.
  • Figure 8 is a schematic diagram of the simulation results based on Figure 7.
  • the PAPR using ⁇ /2-4-PAM+FDSS is 0.6dB (10 -4 ) lower than the PAPR using 16-QAM+FDSS. It can be seen that when the number of bits of the input bit stream is the same, the effect of ⁇ /2-4-PAM+ frequency domain truncation is better than the effect of 16-QAM+ frequency domain expansion.
  • Example 2 In the embodiment of the present application, ⁇ /2-BPSK is used, and ⁇ /2-BPSK is compared with quadrature phase shift keying (QPSK).
  • QPSK quadrature phase shift keying
  • each modulation symbol carries 2 bits, and the absolute value of the phase difference between two adjacent modulation symbols is ⁇ /2; in ⁇ /2-BPSK, each modulation symbol carries 1 bit. It can be seen that each of QPSK The number of bits carried by the modulation symbol is twice that of ⁇ /2-BPSK. Therefore, when the number of bits in the input bit stream is the same, the bandwidth occupied by modulation symbols after being mapped to the frequency domain is ⁇ /2-BPSK twice that of QPSK.
  • ⁇ /2-BPSK+FDSS performs frequency domain truncation
  • QPSK+FDSS performs frequency domain expansion, so that the bandwidth occupied by the two is the same, as shown in Table 2.
  • modulation symbol is mapped to the bandwidth of the frequency domain Frequency domain truncated/expanded bandwidth ⁇ /2-BPSK 100PRB 60PRB QPSK 50PRB 60PRB
  • the roll-off factor ⁇ 0.2.
  • 50PRB*1.2 60PRB.
  • a filter with a roll-off factor of 0.2 is used to make 100PRB ⁇ 60PRB.
  • Figure 9 is a schematic diagram of simulation results, which are based on Table 2.
  • the PAPR using ⁇ /2-BPSK+FDSS is 0.6dB (10 -4 ) lower than the PAPR using QPSK+FDSS. It can be seen that when the number of bits of the input bit stream is the same, the effect of ⁇ /2-BPSK+frequency domain truncation is better than that of QPSK+frequency domain expansion.
  • ⁇ /2-BPSK+ frequency domain truncation affects the output data. PAPR suppression effect is better. Comparing the ⁇ /2-BPSK+ frequency domain truncation used in the embodiment of this application with the ⁇ /2-BPSK+ frequency domain extension shown in Figure 4a, the PAPR suppression of the output data can also be obtained by ⁇ /2-BPSK+ frequency domain truncation Better results. Therefore, the frequency domain truncation can be combined with high-order ⁇ /2-PAM to process the input bit stream, and it can also be combined with ⁇ /2-BPSK to process the input bit stream to achieve the purpose of reducing PAPR.
  • the process shown in Fig. 5 is the process of sending data by the sender.
  • Fig. 10 is a schematic process diagram of the data receiving method provided in this embodiment of the application, that is, the process of receiving data by the receiver. It is understandable that the process of receiving data at the receiving end is the reverse process of sending data at the sending end.
  • the receiving end may be a network device in the network architecture shown in FIG. 1, or a terminal device in the network architecture shown in FIG. 1.
  • the process shown in Figure 10 may include but is not limited to the following steps:
  • Step 201 Receive a second transmission data stream.
  • the receiving end receives the second transmission data stream from the transmitting end through the antenna port and the channel.
  • the second transmission data stream can be the first transmission data stream or other transmission data streams.
  • the second transmission data stream is time domain data.
  • Step 202 Process the second transmission data stream to obtain a third data stream.
  • the receiving end processes the second transmission data to obtain a third data stream, which is frequency domain data.
  • This process is used to transform time domain data into frequency domain data.
  • This processing may include the de-cyclic prefix and DFT shown in FIG. 10, and may also include the de-cyclic prefix and fast Fourier transform (fast Fourier transmission, FFT).
  • FFT fast Fourier transmission
  • the processing in step 202 in FIG. 10 includes removing cyclic prefix and DFT for example, and does not constitute a limitation to the embodiment of the present application.
  • analog-to-digital conversion may also be included before adding cyclic prefix. That is, the processing in step 202 may include cyclic prefix removal, DFT, and analog-to-digital conversion.
  • Step 203 Perform inverse filtering processing on the third transmission data stream to obtain a fourth data stream.
  • the receiving end performs inverse filtering processing on the third transmission data stream to obtain the fourth data stream.
  • the bandwidth corresponding to the fourth data stream is the fourth bandwidth
  • the bandwidth corresponding to the third data stream is the third bandwidth
  • the third bandwidth is smaller than the fourth bandwidth.
  • the modulation symbol obtained by modulating the transmitting end using the high-order ⁇ /2-PAM modulation method is equivalent to the time domain data sequence after DFT transformation to the frequency domain, and then N/4 point shift, and the frequency domain data sequence N
  • N is the length of the time-domain data sequence or the length of the DFT transformation (ie, N-point DFT)
  • the time-domain data sequence is the time-domain pure real data sequence, that is, the time-domain data sequence that only includes the real part. Therefore, the truncated data received by the receiving end contains all the original information. That is, the third data stream whose bandwidth is the third bandwidth received by the receiving end includes all the information of the data stream before the frequency domain truncation, so that the receiving end can restore the data sent by the sending end.
  • the inverse filtering process may include, but is not limited to, the following operations: shifting frequency domain data in the frequency domain, copying part of the data, and obtaining the conjugate of the copied data.
  • shifting frequency domain data in the frequency domain is shown on the left side of Figure 10a
  • operations such as shifting it, copying part of the data, and obtaining the conjugate of the copied data can be obtained as shown on the right side of Figure 10a, namely The frequency domain data before the frequency domain truncation at the transmitting end.
  • the effect of the inverse filtering process is to make the fourth bandwidth larger than the third bandwidth.
  • the name inverse filtering processing is used as an example, and does not constitute a limitation to the embodiment of the present application.
  • IDFT or IFFT processing can be performed to obtain the fourth data stream as time domain data, so as to perform dephase rotation and demodulation on the time domain data.
  • the inverse filtering process includes IDFT or IFFT, so that the fourth data stream is time-domain data.
  • Step 204 Perform dephase rotation and demodulation on the fourth data stream to obtain a second bit stream.
  • the receiving end first dephase-rotates the fourth data stream, and then demodulates to obtain the second bit stream.
  • multiply by the phase rotation factor e k ⁇ j ⁇ then multiply by the phase rotation factor e -k ⁇ j ⁇ when removing the phase rotation factor, or divide by the phase rotation factor e k ⁇ j ⁇ .
  • the modulation mode during demodulation is the same as the modulation mode during modulation. For example, if the modulation mode is 4-PAM, the modulation mode for demodulation is 4-PAM.
  • the receiving end performs inverse filtering processing to restore the frequency domain data sent by the transmitting end.
  • Figure 5 describes the process of sending data at the sender
  • Figure 10 describes the process of receiving data at the receiving end. The following will be introduced from the perspective of interaction between network equipment and terminal equipment, which is divided into two processes: uplink data transmission and downlink data transmission.
  • FIG. 11 is a schematic diagram of the uplink data transmission process provided by the embodiment of this application, which may include but is not limited to the following steps:
  • Step 301 The network device sends first indication information to the terminal device.
  • the terminal device receives the first indication information from the network device.
  • the first indication information is used to instruct the terminal device how to process the first bit stream, and the first bit stream can be understood as the bit stream to be sent by the terminal device, that is, the bit stream to be sent.
  • the first instruction information may include first processing instruction information and/or second processing instruction information.
  • the foregoing first processing instruction information is used to indicate the first modulation mode, and the terminal device may perform modulation according to the first modulation mode.
  • the first processing instruction information There are several ways for the first processing instruction information:
  • the first processing instruction information is the current (modulation and coding scheme, MCS) index (index), that is, the current MCS index is used to indicate the first modulation scheme.
  • the current MCS index can indicate modulation methods such as PAM, QAM, BPSK, QPSK, and the modulation order, and the first modulation method is PAM, QAM, BPSK, QPSK, etc.+modulation order.
  • the terminal device can perform phase rotation after modulation by default, for example, a phase rotation of ⁇ /2.
  • the first processing instruction information is a newly defined MCS index, that is, the first modulation method is indicated through the newly defined MCS index.
  • the newly defined MCS index can indicate ⁇ /2 modulation methods such as ⁇ /2-4-PAM and ⁇ /2-BPSK, so the first modulation method is ⁇ /2-4-PAM, ⁇ /2-BPSK, etc.
  • the terminal equipment can be modulated according to modulation methods such as 4-PAM and BPSK, and then perform a phase rotation of ⁇ /2.
  • the content of the MCS table is similar to the prior art, including the correspondence between the MCS index and the modulation mode, and may also include information such as coding rate and spectrum efficiency.
  • the MCS index instructs the terminal device to determine the modulation order and code rate according to the MCS table of QPSK, 16-QAM, and 64-QAM.
  • the first processing instruction information is the current MCS index + additional instruction information.
  • the current MCS index can indicate PAM, QAM, BPSK, QPSK and other modulation methods and modulation orders.
  • the additional instruction information is used to indicate phase rotation, such as indicating Phase rotation of ⁇ /2.
  • the first modulation mode is PAM, QAM, BPSK, QPSK, etc. + modulation order.
  • the foregoing second processing instruction information is used to instruct the terminal device how to perform filtering processing, and the terminal device may perform filtering processing according to the second processing instruction information.
  • the second processing instruction information There are several ways for the second processing instruction information:
  • the second processing indication information includes one or more of the first bandwidth indication information, the second bandwidth indication information, or the ratio between the first bandwidth and the second bandwidth.
  • the first bandwidth indication information is used to indicate the first bandwidth
  • the second bandwidth indication information is used to indicate the second bandwidth and/or the center frequency of the second bandwidth.
  • the first bandwidth is the original data bandwidth, that is, the bandwidth occupied by the data after modulation and phase rotation, that is, the bandwidth corresponding to the first data stream.
  • the second bandwidth is the bandwidth occupied by the output data, that is, the bandwidth occupied by the first transmission data stream, that is, the bandwidth corresponding to the second data stream.
  • the second processing instruction information is used to indicate the first filter parameter, and the first filter parameter includes the first roll-off factor.
  • the first filtering parameter or the first indication information further includes a filter type, and the filter type indicates a function type of the filter, which may include but is not limited to functions such as raised cosine function, root raised cosine function, and Kaiser window function.
  • the second processing instruction information is used to indicate the second bandwidth, which is the bandwidth actually occupied by the final air interface signal. For example, when the terminal device receives the second processing instruction information from the network device and adopts truncated ⁇ /2-BPSK modulation, and when the bandwidth is given, the terminal device generates data larger than the second bandwidth and modulates it in the frequency domain. Perform truncation to match the second bandwidth.
  • the terminal device can use a modulation method for modulation by default, which is known to both the terminal device and the network device, such as protocol agreement
  • the terminal equipment uses 4-PAM for modulation
  • the network equipment uses 4-PAM for demodulation.
  • the terminal device can perform filtering processing according to a predefined parameter, which is known to both the terminal device and the network device, for example, the predefined parameter
  • the other type of processing instruction information may be default or predefined. Further, both the first processing instruction information and the second processing instruction information may be default or predefined. In this case, step 301 is not required.
  • the first indication information further includes first transmission resource indication information, and the first transmission resource indication information is used to indicate the first time-frequency resource allocated by the network device for uplink transmission of the terminal device, so that the terminal device is The first transmission resource is sent to the network device on the resource.
  • the first transmission resource indication information may also indicate space resources, code domain resources, etc. for uplink transmission.
  • step 301 may include: 301a, the network device sends first processing instruction information to the terminal device; 301b, the network device sends second processing instruction information to the terminal device; 301c, the network device sends the terminal device One or more of the first transmission resource indication information. If 301a and 301b are included, the first processing instruction information and the second processing instruction information may be carried in the same message or in different messages.
  • the first transmission resource indication information and the first processing indication information may be carried in the same message or in different messages; the first transmission resource indication information and the second processing indication information may be carried in The same message can also be carried in different messages; the first transmission resource indication information, the first processing indication information, and the second processing indication information can be carried in the same message.
  • the first indication information includes the first transmission resource indication information, The first processing instruction information and the second processing instruction information may also be carried in three different messages.
  • Step 302 The terminal device processes the first bit stream according to the first indication information to obtain the first transmission data stream.
  • Step 301 the terminal device performs modulation and phase rotation according to the first processing instruction information to obtain the first data stream; performs filtering processing according to the second processing instruction information to obtain the second data stream; The stream is processed to obtain the first transmission data stream.
  • Step 302 is similar to the flow shown in FIG. 5, except that the processing is performed in step 302 according to the processing instruction information.
  • the terminal device performs modulation and phase rotation according to the first processing instruction information to obtain the first data stream, which may include:
  • the terminal device modulates according to the first modulation method to obtain the first modulation data stream.
  • the first modulation data included in the first modulation data stream is a real number; by default, the first modulation data stream is performed Rotate the phase to get the first data stream.
  • the terminal device For the second method of processing the instruction information, the terminal device performs modulation and phase rotation according to the first modulation method to obtain the first data stream.
  • the terminal device modulates according to the first modulation method to obtain the first modulated data stream, and performs phase rotation on the first modulated data stream according to the additional instruction information to obtain the first data stream.
  • the terminal device performs filtering processing according to the second processing instruction information to obtain the second data stream, which may include:
  • the terminal device For the first method of processing the instruction information, if the second processing instruction information includes the first bandwidth instruction information and the second bandwidth instruction information, then the terminal device performs processing on the frequency domain data of the first data stream according to the first bandwidth and the second bandwidth. The frequency domain truncation is performed so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth. If the second processing indication information includes the first bandwidth indication information and the ratio between the first bandwidth and the second bandwidth, the terminal device determines the second bandwidth according to the first bandwidth and the ratio, and then compares the first data stream according to the second bandwidth. The frequency domain data of is subjected to frequency domain truncation, so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth.
  • the terminal device determines the first bandwidth according to the second bandwidth and the ratio, and compares the first data with the first bandwidth and the second bandwidth.
  • the frequency domain data of the stream is truncated in the frequency domain, so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth.
  • the terminal device can obtain the second bandwidth.
  • the specific method for obtaining the second bandwidth is not limited.
  • the second bandwidth can be indicated by other indication information; and then according to the first bandwidth and the second bandwidth pair The frequency domain data of the first data stream is truncated in the frequency domain, so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth.
  • the terminal device can obtain the first bandwidth.
  • the specific method for obtaining the first bandwidth is not limited.
  • the first bandwidth can be indicated by other indication information; and then according to the first bandwidth and the second bandwidth pair The frequency domain data of the first data stream is truncated in the frequency domain, so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth.
  • the terminal device obtains the first bandwidth or the second bandwidth, and the specific method for obtaining is not limited, and then the second bandwidth or the first bandwidth is determined. Bandwidth, and then perform frequency domain truncation on the frequency domain data of the first data stream, so that the bandwidth corresponding to the second data stream after the frequency domain truncation is the second bandwidth.
  • the terminal device directly performs frequency domain truncation on the frequency domain data of the first data stream according to the first roll-off factor, so that the second bandwidth is smaller than the first bandwidth.
  • the first roll-off factor is 0.2.
  • the terminal device performs modulation and phase rotation according to a default or predefined modulation mode, and performs filtering according to a default or predefined roll-off factor to obtain the second data stream.
  • Step 303 The terminal device sends the first transmission data stream to the network device.
  • the network device receives the first transmission data stream from the terminal device.
  • the first indication information further includes first transmission resource indication information, the first transmission resource indication information is used to indicate the first time-frequency resource, and the terminal device sends the first transmission data to the network device on the first time-frequency resource flow.
  • Step 304 The network device processes the first transmission data stream to obtain the first bit stream.
  • Step 301 the network device processes the first transmission data stream according to the information indicated by the first indication information to obtain the first bit stream.
  • Step 304 is similar to the flow shown in FIG. 10, except that the processing is performed in step 304 according to the indicated information. For example, the network device performs demodulation according to the first modulation method, or performs phase rotation and demodulation according to the first modulation method.
  • the network device processes the first transmission data stream according to the default or predefined information.
  • the terminal device processes the first bit stream according to the first instruction information issued by the network device to obtain the first transmission data stream and sends the first transmission data stream to the network device.
  • the first instruction The information can be truncated in the frequency domain, thereby reducing the PAPR of the first transmission data stream.
  • FIG. 12 is a schematic diagram of the flow of downlink data transmission provided by the embodiment of this application, which may include but is not limited to the following steps:
  • Step 401 The network device processes the second bit stream to obtain the second transmission data stream.
  • step 401 For the execution process of step 401, refer to the data sending process shown in FIG. 10, which will not be repeated here.
  • Step 402 The network device sends the second transmission data stream to the terminal device.
  • the terminal device receives the second transmission data stream from the network device.
  • the network device sends the second transmission data stream to the terminal device through the antenna port and the channel.
  • Step 403 The network device sends second indication information to the terminal device.
  • the terminal device receives the second indication information from the network device.
  • the second indication information is used to instruct the network device how to process the second bit stream in step 401, so that when the terminal device receives the second transmission data stream, it can perform a reverse operation to obtain the second bit stream.
  • the second bit stream can be understood as the bit stream to be sent by the network device.
  • the second instruction information includes third processing instruction information and/or fourth processing instruction information.
  • the foregoing third processing instruction information is used to instruct the network device to perform filtering processing parameters, so that the terminal device can perform inverse filtering processing according to the third processing instruction information.
  • the third processing instruction information is similar to the second processing instruction information, and both are parameters that indicate filtering processing. The difference is that the second processing instruction information instructs the terminal device how to filter the uplink transmission, and the third processing instruction information is used to indicate Network equipment has performed or will perform filtering processing parameters for downlink transmission.
  • the third processing indication information includes one or more of the third bandwidth indication information, the fourth bandwidth indication information, or the ratio between the third bandwidth and the fourth bandwidth.
  • the third bandwidth indication information is used to indicate the third bandwidth
  • the fourth bandwidth indication information is used to indicate the fourth bandwidth and/or the center frequency of the fourth bandwidth.
  • the third bandwidth is the original data bandwidth, that is, the bandwidth occupied by the data after modulation and phase rotation, that is, the bandwidth corresponding to the third data stream.
  • the fourth bandwidth is the bandwidth occupied by the output data, that is, the bandwidth occupied by the second transmission data stream, that is, the bandwidth corresponding to the second data stream, that is, the bandwidth configured by the network device for the terminal device to receive the second transmission data stream.
  • the third processing instruction information is used to indicate the second filter parameter, and the second filter parameter includes the second roll-off factor.
  • the second filtering parameter or the second indication information further includes a filter type, and the filter type indicates a function type of the filter, so that the terminal device can select a corresponding filter function to perform inverse filtering processing.
  • the third processing instruction information is used to indicate the position of the conjugate symmetry point of the frequency domain signal, for example, it is used to indicate the position index of the conjugate symmetry point of the frequency domain signal.
  • the terminal device performs receiving processing according to the position of the conjugate symmetry point.
  • the position index of the conjugate symmetry point in mode three can be seen in Figure 12a.
  • the third processing instruction information is used to indicate the length of the redundant data, and the terminal device can determine the length of the frequency domain data that needs to be recovered according to the length of the redundant data, and perform receiving and demodulation.
  • the length of the redundant data in the fourth mode can be seen in Figure 12a.
  • the foregoing fourth processing instruction information is used to indicate the second modulation mode for the network device to modulate the second bit stream, so that the terminal device performs demodulation according to the second modulation mode.
  • the second modulation method may be the same as the first modulation method, for example, 4-PAM; or different, for example, the first modulation method is 4-PAM, and the second modulation method is BPSK.
  • the fourth processing instruction information is similar to the first processing instruction information. The difference is that the first processing instruction information is used to indicate which modulation method the terminal device uses for modulation, and the fourth processing instruction information is used to indicate that the network device has adopted or will The modulation method used.
  • the fourth processing instruction information is the same as the first processing instruction information, and there are also three ways. For details, please refer to the specific description of the first processing instruction information.
  • the second instruction information includes one type of processing instruction information but does not include another type of processing instruction information
  • the other type of processing instruction information may be default or predefined.
  • both the third processing instruction information and the fourth processing instruction information may be default or predefined. In this case, step 403 does not need to be executed.
  • step 403 may be executed after step 402 as shown in FIG. 12, or may be executed before step 401.
  • the second indication information further includes second transmission resource indication information, the second transmission resource indication information is used to indicate the second time-frequency resource, and the second time-frequency resource is the time-frequency occupied by the network device to send the second transmission data stream Resources to facilitate the terminal device to receive the second transmission data stream from the network device on the second time-frequency resource.
  • step 403 may include: 403a, the network device sends third processing instruction information to the terminal device; 403b, the network device sends fourth processing instruction information to the terminal device; 403c, the network device sends third processing instruction information to the terminal device One or more of the second transmission resource indication information. If 403a and 403b are included, the third processing instruction information and the fourth processing instruction information may be carried in the same message or in different messages.
  • the second transmission resource indication information and the third processing indication information may be carried in the same message or in different messages; the second transmission resource indication information and the fourth processing indication information may be carried in The same message may also be carried in different messages; the second transmission resource indication information, the third processing indication information, and the fourth processing indication information may be carried in the same message.
  • the second indication information includes the second transmission resource indication information, The third processing instruction information and the fourth processing instruction information may also be carried in three different messages.
  • Step 404 The terminal device processes the second transmission data stream according to the second indication information to obtain a second bit stream.
  • Step 404 is similar to the flow shown in FIG. 10, except that the step 404 is processed according to the second instruction information.
  • the terminal device When receiving the second transmission data stream, the terminal device sequentially performs cyclic prefix removal and DFT processing on the second transmission data stream to obtain a third data stream, which is frequency domain data.
  • the terminal device performs inverse filtering processing on the third data stream according to the third processing instruction information to obtain the fourth data stream. If the third processing indication information is used to indicate the second filter parameter, and the second filter parameter includes the second roll-off factor, then the terminal device performs operations such as copying, conjugate, shifting, etc., to the third data stream according to the second roll-off factor , Making the fourth bandwidth greater than the third bandwidth. If the third processing instruction information includes the third bandwidth instruction information and the fourth bandwidth instruction information, the terminal device performs operations such as copying, conjugate, and moving of the third data stream according to the third bandwidth and the fourth bandwidth, so that the fourth data stream The bandwidth corresponding to the flow is the fourth bandwidth.
  • the terminal device performs dephase rotation and demodulation on the fourth data stream according to the fourth processing instruction information to obtain the second bit stream.
  • the de-phase rotation factor can be multiplied by the phase rotation factor e k ⁇ j ⁇ or divided by the phase rotation factor e k ⁇ j ⁇ .
  • the second modulation method is used for demodulation.
  • the terminal device When the network device executes step 403, the terminal device performs inverse filtering processing according to the default or predefined filtering parameters, and performs demodulation according to the default or predefined modulation mode to obtain the second bit stream.
  • the network device notifies the terminal device of its processing parameters for the second bit stream, so that the terminal device performs inverse processing according to these parameters to obtain the second bit stream.
  • the network device can implement frequency domain truncation, thereby reducing the PAPR of the second transmission data stream.
  • the terminal device performs frequency domain truncation when sending data
  • the network device performs frequency domain truncation when sending data
  • the network device may indicate whether to perform frequency domain truncation or frequency domain expansion.
  • the network device can indicate whether the terminal device performs frequency domain truncation or frequency domain expansion of the bit stream to be sent.
  • the indication may be indicated implicitly by the second processing indication information, for example, implicitly indicated by the first roll-off factor.
  • the first roll-off factor is positive, it indicates frequency domain expansion; when it is negative, it indicates frequency domain truncation.
  • the size of the first bandwidth and the second bandwidth can implicitly indicate frequency domain truncation or frequency domain expansion.
  • the indication may also be indicated by additional indication information, for example, by an additional 1 bit. When the bit is 1, it indicates frequency domain extension; when it is 0, it indicates frequency domain truncation. This is convenient for the network device to perform corresponding recovery when receiving the first transmission data stream.
  • the network device can inform the terminal device whether the network device performs frequency domain truncation or frequency domain expansion on the bit stream to be sent.
  • the implicit indication may be indicated through the third processing, or may be indicated through additional indication information. This is convenient for the terminal device to perform corresponding recovery when receiving the second transmission data stream.
  • the pilot signal may be a phase tracking reference signal (PT-RS) or other pilot reference signals.
  • PT-RS phase tracking reference signal
  • the pilot signal in the embodiment of the present application takes PT-RS as an example.
  • the constellation diagram takes the constellation diagram of 16-QAM as an example.
  • the PT-RS constellation points are located at the four constellation points near the origin of the coordinate before power expansion, and are located in the dotted square after the power expansion, that is, the PT-RS constellation points are expanded from the inner circumference of the 16-QAM constellation to the outermost periphery through power expansion.
  • the transmitting end modulates the bit stream to be sent to obtain the first data stream.
  • the first data stream includes multiple first data, and the first data is a real number; the first data stream is power spread and phased Rotate to obtain a second data stream, where part of the second data included in the second data stream is plural; process the second data stream to obtain a transmission data stream, and send the transmission data stream.
  • the bit stream to be sent is the bit stream of the pilot signal, for example, the bit stream of PT-RS. In this way, the signal-to-noise ratio of the pilot signal can be improved, the measurement estimation accuracy can be improved, and the PAPR of the pilot signal can also be reduced.
  • the sending end modulates the bit stream to be sent, and the modulation mode can be BPSK, 2-PAM or 4-PAM.
  • the pilot signal is always modulated according to the BPSK, 2-PAM or 4-PAM modulation method.
  • Which one of BPSK, 2-PAM or 4-PAM is specifically used may be predefined, or may be related to the number of bits carried by the modulation symbol, that is, related to the length of the pilot sequence. For example, if the length of the pilot sequence is 2, then 4-PAM is used for modulation.
  • the transmitting end performs power expansion and phase rotation on the first data stream, which may be power expansion first and then phase rotation, or phase rotation first and then power expansion.
  • the bit stream to be sent is modulated to ⁇ -1, +1, -1, +1 ⁇
  • the expansion factor is A, Get ⁇ -A, +A, -A, +A ⁇ ; then perform a phase rotation of ⁇ /2 on ⁇ -A, +A, -A, +A ⁇ , and if you start numbering from 0, you get ⁇ -A, + Aj, +A, -Aj ⁇ , if you start numbering from 1, you get ⁇ -Aj, -A, +Aj, +A ⁇ .
  • the expansion factor is A, and get ⁇ -A, +Aj, +A, -Aj ⁇ or ⁇ -Aj, -A, +Aj, +A ⁇ .
  • the expansion multiple of the power expansion may be predefined, or may be configured by the network device for the terminal device.
  • the sending end processes the second data stream, and the processing may be frequency domain-time domain processing, for example, DFT, IFFT, and cyclic prefix addition are sequentially performed on the second data stream.
  • FDSS may be included between DFT and IFFT, and the FDSS may be frequency domain truncation or frequency domain extension. How to process the second data stream is not limited in the embodiment of this application.
  • the embodiments of the present application also provide corresponding devices, and the devices include corresponding modules for executing the foregoing embodiments.
  • the module can be software, hardware, or a combination of software and hardware.
  • FIG 14 shows a schematic diagram of the structure of a device.
  • the device 500 may be a network device, a terminal device, a chip, a chip system, or a processor that supports the network device to implement the above method, or a chip, a chip system, or a chip that supports the terminal device to implement the above method. Or processor, etc.
  • the device can be used to implement the method described in the foregoing method embodiment, and for details, please refer to the description in the foregoing method embodiment.
  • the apparatus 500 may include one or more processors 501, and the processor 501 may also be referred to as a processing unit, which may implement certain control functions.
  • the processor 501 may be a general-purpose processor or a special-purpose processor. For example, it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, and process Software program data.
  • the processor 501 may also store instructions and/or data 503, and the instructions and/or data 503 may be executed by the processor, so that the apparatus 500 executes the above method embodiments. Described method.
  • the processor 501 may include a transceiver unit for implementing receiving and sending functions.
  • the transceiver unit may be a transceiver circuit, or an interface, or an interface circuit.
  • the transceiver circuits, interfaces, or interface circuits used to implement the receiving and sending functions can be separate or integrated.
  • the foregoing transceiver circuit, interface, or interface circuit can be used for code/data reading and writing, or the foregoing transceiver circuit, interface, or interface circuit can be used for signal transmission or transmission.
  • the apparatus 500 may include a circuit, which may implement the sending or receiving or communication functions in the foregoing method embodiments.
  • the device 500 may include one or more memories 502, on which instructions 504 may be stored, and the instructions may be executed on the processor, so that the device 500 executes the foregoing method embodiments. Described method.
  • data may also be stored in the memory.
  • instructions and/or data may also be stored in the processor.
  • the processor and memory can be provided separately or integrated together. For example, the corresponding relationship described in the foregoing method embodiment may be stored in a memory or in a processor.
  • the device 500 may further include a transceiver 505 and/or an antenna 506.
  • the processor 501 may be referred to as a processing unit, and controls the device 500.
  • the transceiver 505 may be called a transceiver unit, a transceiver, a transceiver circuit or a transceiver, etc., for implementing the transceiver function.
  • the apparatus 500 is a terminal device: the processor 501 is configured to perform step 101 to step 103 in FIG. 5; perform step 202 to step 204 in FIG. 10; perform step 302 in FIG. 11 ; Perform step 404 in Figure 12.
  • the transceiver 505 is used to perform step 104 in FIG. 5; perform step 201 in FIG. 10; perform step 301 and step 303 in step 11; and perform step 402 and step 403 in FIG.
  • the apparatus 500 is a network device: the processor 501 is configured to perform step 101 to step 103 in FIG. 5; perform step 202 to step 204 in FIG. 10; perform step 304 in FIG. 11 ; Perform step 401 in Figure 12.
  • the transceiver 505 is used to perform step 104 in FIG. 5; perform step 201 in FIG. 10; perform step 301 and step 303 in step 11; and perform step 402 and step 403 in FIG.
  • the processor and transceiver described in this application can be implemented in integrated circuit (IC), analog IC, radio frequency integrated circuit RFIC, mixed signal IC, application specific integrated circuit (ASIC), printed circuit board ( printed circuit board, PCB), electronic equipment, etc.
  • the processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), and P-type Metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.
  • CMOS complementary metal oxide semiconductor
  • NMOS nMetal-oxide-semiconductor
  • PMOS bipolar junction transistor
  • BiCMOS bipolar CMOS
  • SiGe silicon germanium
  • GaAs gallium arsenide
  • the device described in the above embodiment may be a network device or a terminal device, but the scope of the device described in this application is not limited to this, and the structure of the device may not be limited by FIG. 14.
  • the device can be a standalone device or can be part of a larger device.
  • the device may be:
  • the IC collection may also include storage components for storing data and/or instructions;
  • ASIC such as modem (MSM)
  • FIG. 15 provides a schematic structural diagram of a terminal device.
  • the terminal device 600 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the entire terminal, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the storage unit, parse and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit processes the baseband signal to obtain a radio frequency signal and sends the radio frequency signal out in the form of electromagnetic waves through the antenna. .
  • the radio frequency circuit receives the radio frequency signal through the antenna, the radio frequency signal is further converted into a baseband signal, and the baseband signal is output to the processor, and the processor converts the baseband signal into data and performs processing on the data. deal with.
  • FIG. 15 only shows a memory and a processor. In actual terminal devices, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present invention.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly used to process communication protocols and communication data.
  • the central processing unit is mainly used to control the entire terminal device and execute Software program, processing the data of the software program.
  • the processor in FIG. 15 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors and are interconnected by technologies such as buses.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing the communication protocol and communication data may be built in the processor, or stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.
  • the antenna and the control circuit with the transceiving function can be regarded as the transceiving unit 611 of the terminal device 600, and the processor with the processing function can be regarded as the processing unit 612 of the terminal device 600.
  • the terminal device 600 includes a transceiver unit 611 and a processing unit 612.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on.
  • the device for implementing the receiving function in the transceiver unit 611 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 611 as the sending unit, that is, the transceiver unit 611 includes a receiving unit and a sending unit.
  • the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc.
  • the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.
  • the foregoing receiving unit and sending unit may be an integrated unit or multiple independent units.
  • the above-mentioned receiving unit and sending unit may be in one geographic location, or may be scattered in multiple geographic locations.
  • an embodiment of the present application provides another apparatus 700.
  • the device can be a terminal device or a component of a terminal device (for example, an integrated circuit, a chip, etc.).
  • the device may also be a network device, or a component of a network device (for example, an integrated circuit, a chip, etc.).
  • the device may also be another communication module, which is used to implement the method in the method embodiment of the present application.
  • the apparatus 700 may include: a processing module 702 (processing unit).
  • it may also include a transceiver module 701 (transceiver unit) and a storage module 703 (storage unit).
  • one or more modules as shown in Figure 16 may be implemented by one or more processors, or by one or more processors and memories; or by one or more processors It can be implemented with a transceiver; or implemented by one or more processors, memories, and transceivers, which is not limited in the embodiment of the present application.
  • the processor, memory, and transceiver can be set separately or integrated.
  • the device has the function of realizing the terminal device described in the embodiment of this application.
  • the device includes a terminal device to execute the module or unit or means corresponding to the step related to the terminal device described in the embodiment of this application.
  • the function Or a unit or means (means) can be implemented by software, or by hardware, or by hardware executing corresponding software, or by a combination of software and hardware.
  • a unit or means can be implemented by software, or by hardware, or by hardware executing corresponding software, or by a combination of software and hardware.
  • the device has the function of implementing the network device described in the embodiment of this application.
  • the device includes the module or unit or means corresponding to the network device executing the steps involved in the network device described in the embodiment of this application.
  • the functions or units or means (means) can be realized by software, or by hardware, or by hardware executing corresponding software, or by a combination of software and hardware.
  • each module in the apparatus 700 in the embodiment of the present application may be used to execute the method described in FIG. 5, FIG. 10, FIG. 11, or FIG. 12 in the embodiment of the present application.
  • the device 700 is a terminal device:
  • the processing module 702 is configured to modulate and phase rotate the first bit stream to obtain a first data stream.
  • the first data stream includes multiple first data, and each first data carries n First bit, n is a positive integer greater than 1; filter the first data stream to obtain the second data stream, the bandwidth corresponding to the first data stream is the first bandwidth, and the bandwidth corresponding to the second data stream is the second The second bandwidth is smaller than the first bandwidth; the second data stream is processed to obtain the first transmission data stream; the transceiver module 701 is configured to send the first transmission data stream.
  • the transceiver module 701 is further configured to receive first indication information, where the first indication information includes first processing indication information; the processing module is specifically configured to modulate and phase rotate the first bit stream according to the first processing indication information.
  • the transceiver module 701 is configured to receive the second transmission data stream; the processing module 702 is configured to process the second transmission data stream to obtain a third data stream; The data stream is subjected to inverse filtering processing to obtain a fourth data stream, the bandwidth of the third data stream is a third bandwidth, the bandwidth of the fourth data stream is a fourth bandwidth, and the third bandwidth is smaller than the fourth bandwidth ; Perform dephase rotation and demodulation on the fourth data stream to obtain a second bit stream.
  • the transceiver module 701 is further configured to receive second instruction information, where the second instruction information includes third processing instruction information; the processing module is specifically configured to perform inverse filtering processing on the third data stream according to the third processing instruction information.
  • the processing module 702 is configured to modulate the bit stream to be sent to obtain a first data stream.
  • the first data stream includes a plurality of first data, and the first data is a real number; Perform power expansion and phase rotation to obtain a second data stream, where part of the second data included in the second data stream is a complex number; process the second data stream to obtain a transmission data stream; the transceiver module 701 is used to send the transmission data stream.
  • the device 700 is a network device:
  • the processing module 702 is configured to modulate and phase rotate the first bit stream to obtain a first data stream.
  • the first data stream includes multiple first data, and each first data carries n First bit, n is a positive integer greater than 1; filter the first data stream to obtain the second data stream, the bandwidth corresponding to the first data stream is the first bandwidth, and the bandwidth corresponding to the second data stream is the second The second bandwidth is smaller than the first bandwidth; the second data stream is processed to obtain the first transmission data stream; the transceiver module 701 is configured to send the first transmission data stream.
  • the transceiver module 701 is configured to receive the second transmission data stream; the processing module 702 is configured to process the second transmission data stream to obtain a third data stream; The data stream is subjected to inverse filtering processing to obtain a fourth data stream, the bandwidth of the third data stream is a third bandwidth, the bandwidth of the fourth data stream is a fourth bandwidth, and the third bandwidth is smaller than the fourth bandwidth ; Perform dephase rotation and demodulation on the fourth data stream to obtain a second bit stream.
  • the processing module 702 is configured to modulate the bit stream to be sent to obtain a first data stream.
  • the first data stream includes a plurality of first data, and the first data is a real number; Perform power expansion and phase rotation to obtain a second data stream, where part of the second data included in the second data stream is a complex number; process the second data stream to obtain a transmission data stream; the transceiver module 701 is used to send the transmission data stream.
  • the processing unit used to execute these technologies at a communication device can be implemented in one or more general-purpose processors, digital signal processors, DSP), digital signal processing device, application specific integrated circuit (ASIC), programmable logic device, field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor Logic, discrete hardware components, or any combination of the above.
  • the general-purpose processor may be a microprocessor, and optionally, the general-purpose processor may also be any traditional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration achieve.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electronic Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • serial link DRAM SLDRAM
  • direct rambus RAM direct rambus RAM
  • the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, the function of any of the foregoing method embodiments is realized.
  • This application also provides a computer program product, which, when executed by a computer, realizes the functions of any of the foregoing method embodiments.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.
  • the corresponding relationships shown in the tables in this application can be configured or pre-defined.
  • the value of the information in each table is only an example and can be configured to other values, which is not limited in this application.
  • it is not necessarily required to configure all the correspondences indicated in the tables.
  • the corresponding relationship shown in some rows may not be configured.
  • appropriate deformation adjustments can be made based on the above table, such as splitting, merging and so on.
  • the names of the parameters shown in the titles in the above tables may also be other names that can be understood by the communication device, and the values or expressions of the parameters may also be other values or expressions that can be understood by the communication device.
  • other data structures can also be used, such as arrays, queues, containers, stacks, linear tables, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables. Wait.
  • the pre-definition in this application can be understood as definition, pre-definition, storage, pre-storage, pre-negotiation, pre-configuration, curing, or pre-fired.

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Abstract

本申请实施例提供一种数据传输方法及其装置，其中方法包括：发送端对比特流进行调制和相位旋转，得到第一数据流；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；进一步的，发送端对第二数据流进行处理，得到传输数据流，并发送传输数据流。采用本申请实施例，可以降低传输数据的峰均比。

Description

数据传输方法及其装置
本申请要求于2019年8月15日提交中国专利局、申请号为201910755207.2、申请名称为“数据传输方法及其装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，具体涉及一种数据传输方法及其装置。
背景技术
无线信号从时域上观测是幅度不断变化的正弦波，幅度并不恒定，一个周期内的信号幅度峰值和其他周期内的幅度峰值不一样，因此每个周期的平均功率和峰值功率不一样。在一个较长的时间内，峰值功率是以某种概率出现的最大瞬态功率，通常这个概率为0.01％，在这个概率下的峰值功率与系统总的平均功率之比为峰值平均功率比(peak to average power ratio，PAPR)，简称峰均比。
无线通信系统的信号向远处发，需要进行功率放大。由于一般的功率放大器的动态范围都是有限的，因此PAPR较大的信号极易进入功率放大器的非线性区域，导致信号产生非线性失真，进而导致整个系统性能严重下降。因此，如何降低信号的PAPR是亟待解决的技术问题。
发明内容
本申请实施例提供一种数据传输方法及其装置，可以降低传输数据的PAPR。
本申请实施例第一方面提供一种数据传输方法，包括：
对比特流进行调制和相位旋转，得到第一数据流；
对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽。
本申请实施例第一方面，为发送端对比特流进行处理的过程，发送端可以是网络设备，也可以是终端设备。通过滤波处理使得第二带宽小于第一带宽，从而降低传输数据的PAPR。
进一步的，在得到第二数据流之后，对第二数据流进行处理，得到传输数据流，并发送传输数据流。传输数据流的带宽小于比特流的带宽，从而降低传输数据流的PAPR。
其中，第一数据流包括多个第一数据，每个第一数据承载n个比特，n为大于1的正整数，可以提高频谱效率。
在一种可能的实现方式中，终端设备或网络设备采用调制方式对比特流进行调制，得到调制数据流，调制数据流包括多个调制数据，调制数据为实数；对调制数据流进行相位旋转，得到第一数据流，第一数据流包括的部分第一数据为复数。进行调制和相位旋转，可抑制PAPR。
其中，调制方式可以是4阶、8阶或者更高阶的脉冲幅度调制，若调制方式为4阶脉冲幅度调制，那么每个第一数据承载2个比特；若调制方式为8阶脉冲幅度调制，那么每个第一数据承载3个比特；若调制方式为16阶脉冲幅度调制，那么每个第一数据承载4个 比特。相位旋转的相位旋转因子可表示为e k×j×ω，其中，ω为相位，可以是π/2或π/4等；k为调制数据的索引，可以从“0”开始编号，也可以从“1”开始编号。若发送端为网络设备，那么网络设备可将其采用的调制方式告知终端设备；若发送端为终端设备，那么终端设备可采用网络设备指示的调制方式对比特流进行调制。
在一种可能的实现方式中，终端设备在对第一比特流进行调制和相位旋转之前，可接收第一处理指示信息，第一处理指示信息用于指示对比特流进行调制的调制方式，根据该调制方式对比特流进行调制和相位旋转。第一处理指示信息可为网络设备为终端设备配置的，终端设备根据第一处理指示信息对第一比特流进行调制和相位旋转，便于网络设备在接收到传输数据流时进行相应的解调。该方式下，传输数据流的发送端为终端设备，传输数据流的接收端为网络设备，终端设备向网络设备发送传输数据流，对应于上行传输场景。
终端设备采用第一处理指示信息所指示的调制方式对比特流进行调制，得到调制数据流，调制数据流包括多个调制数据，调制数据为实数；对调制数据流进行相位旋转，得到第一数据流，第一数据流包括的部分第一数据为复数。进行调制和相位旋转，可抑制PAPR。
终端设备可根据第一处理指示信息所指示的调制方式进行调制，也可以根据默认的调制方式进行调制，该默认的调制方式可以是协议约定的，也可以是网络设备预先通过其他方式告知终端设备的。
在一种可能的实现方式中，终端设备在对第一数据流进行滤波处理之前，可接收第二处理指示信息，第二处理指示信息用于指示对第一数据流进行滤波处理的参数，即用于指示如何对第一数据流进行滤波处理。终端设备根据第二处理指示信息对第一数据流进行滤波处理，得到第二数据流，该滤波处理实现频域截断，使得第二数据流的带宽小于第一数据流的带宽，从而有利于降低PAPR。
其中，第二处理指示信息和上述第一处理指示信息可携带在同一消息中，也可以携带在不同消息中。
若发送端为网络设备，那么网络设备可将其进行滤波处理的参数告知终端设备；若发送端为终端设备，那么终端设备可根据网络设备发送的第二处理指示信息进行滤波处理。
在一种可能的实现方式中，上述第二处理指示信息包括第一带宽指示信息、第二带宽指示信息或第一带宽与第二带宽之间的比值中的一种或多种，其中，第一带宽指示信息用于指示第一带宽，第二带宽指示信息用于指示第二带宽和/或第二带宽的中心频点。
若包括第一带宽指示信息和第二带宽指示信息，根据第一带宽和第二带宽对第一数据流进行频域截断，使得第二数据流的带宽为第二带宽。
若包括第一带宽指示信息和第一带宽与第二带宽之间的比值，根据第一带宽和该比值确定第二带宽，进行频域截断，使得第二数据流的带宽为第二带宽。
若包括第二带宽指示信息和第一带宽与第二带宽之间的比值，根据第二带宽和该比值确定第一带宽，对第一带宽的第一数据流进行频域截断，使得第二数据流的带宽为第二带宽。
若包括第一带宽与第二带宽之间的比值，第一带宽或第二带宽可以预定义，根据预定义的第一带宽或第二带宽，以及该比值进行频域截断，使得第二数据流的带宽为第二带宽。
若包括第一带宽指示信息或第二带宽指示信息，第一带宽与第二带宽之间的比值可以 是预定义的，根据第一带宽或第二带宽，以及该比值进行频域截断，使得第二数据流的带宽为第二带宽。
在一种可能的实现方式中，上述第二处理指示信息用于指示滤波参数，滤波参数包括滚降因子，根据滚降因子对频域数据进行频域截断，使得第二带宽小于第一带宽。滚降因子也可以不通过第二处理指示信息指示，例如是预定义的。
在一种可能的实现方式中，该方法还包括接收传输资源指示信息，传输资源指示信息用于指示时域资源，在时频资源上发送传输数据流。通过传输资源指示信息指示的时域资源发送传输数据流。
传输资源指示信息与第一处理指示信息和第二处理指示信息可以携带在同一消息中，也可以是传输资源指示信息与第一处理指示信息或第二处理指示信息携带在同一消息中，还可以是三个指示信息分别携带在不同的消息中。
本申请实施例第二方面提供一种数据传输方法，包括：
对第三数据流进行逆滤波处理，得到第四数据流，第三数据流的带宽为第三带宽，第四数据流的带宽为第四带宽，第三带宽小于所述第四带宽；
对第四数据流进行去相位旋转和解调，得到比特流。
进一步的，在第三数据流进行逆滤波处理之前，接收传输数据流，对传输数据流进行处理，得到第三数据流。本申请实施例第二方面，为接收端对接收数据进行处理的过程，接收端可以是网络设备，也可以是终端设备。接收端接收的传输数据流具有低PAPR，进行逆滤波处理、去相位旋转和解调等处理，可以恢复发送端发送的比特流。
在一种可能的实现方式中，对第三数据流进行逆滤波处理之前，接收第三处理指示信息，根据第三处理指示信息对第三数据流进行逆滤波处理。第三处理指示信息可为网络设备为终端设备配置的，用于告知终端设备如何进行滤波处理。该方式下，传输数据流的发送端为网络设备，传输数据流的接收端为终端设备，为终端设备从网络设备接收数据并处理的过程，对应于下行传输场景。
在一种可能的实现方式中，上述第三处理指示信息包括第三带宽指示信息、第四带宽指示信息或第三带宽与第四带宽之间的比值中的一种或多种，其中，第四带宽指示信息用于指示第四带宽，第三带宽指示信息用于指示第三带宽和/或第三带宽的中心频点。
在一种可能的实现方式中，上述第三处理指示信息用于指示第二滤波参数，第二滤波参数包括第二滚降因子，第二滚降因子与第一滚降因子可以相同，也可以不相同。
在一种可能的实现方式中，该方法还包括接收第四处理指示信息，第四处理指示信息用于指示采用何种调制方式进行解调。终端设备在接收到第四处理指示信息时，根据第四处理指示信息对第四数据流进行去相位旋转和解调，以恢复发送端发送的比特流。
第四处理指示信息与第三处理指示信息可以携带在同一条消息中，也可以携带在不同消息中。
终端设备可根据第四处理指示信息所指示的调制方式进行解调，也可以根据默认的调制方式进行解调，该默认的调制方式可以是协议约定的。
在一种可能的实现方式中，该方法还包括接收传输资源指示信息，传输资源指示信息用于指示时频资源，在该时频资源上接收传输数据流。通过传输资源指示信息指示网络设 备发送传输数据流的时频资源，以便终端设备在该时频资源上接收传输数据流。
传输资源指示信息与第三处理指示信息和第四处理指示信息可以携带在同一消息中，也可以是传输资源指示信息与第三处理指示信息或第四处理指示信息携带在同一消息中，还可以是三个指示信息分别携带在不同的消息中。
本申请实施例第三方面提供一种数据传输方法，包括：
对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；
对第一数据流进行功率扩展和相位旋转，得到第二数据流，第二数据流包括的部分第二数据为复数；
对第二数据流进行处理，得到传输数据流，并发送传输数据流。
本申请实施例第三方面中，待发送比特流可以是导频信号的比特流，通过对导频信号进行功率扩展和相位旋转，这样既可以提高导频信号的信噪比，提高测量估计精度，还可以降低导频信号的PAPR。
在一种可能的实现方式中，对第一数据流进行功率扩展和相位旋转，得到第二数据流，包括：对第一数据流进行功率扩展，得到功率扩展数据流，功率扩展数据流包括多个功率扩展数据，功率扩展数据为实数；对功率扩展数据流进行相位旋转，得到第二数据流。
在一种可能的实现方式中，对第一数据流进行功率扩展和相位旋转，得到第二数据流，包括：对第一数据流进行相位旋转，得到相位旋转数据流，相位旋转数据流包括多个相位旋转数据，相位旋转数据包括的部分相位旋转数据为复数；对相位旋转数据流进行功率扩展，得到第二数据流。
先进行功率扩展还是先进行相位旋转，达到的效果相同。
本申请实施例第四方面提供一种数据传输装置，该装置可以是终端设备，也可以是终端设备中的装置，例如为芯片，或者是能够与终端设备匹配使用的装置。一种设计中，该装置可以包括执行第一方面或第三方面描述的方法/操作/步骤/动作所对应的模块，该装置还可以包括执行第二方面描述的方法/操作/步骤/动作所对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该装置可以包括收发模块和处理模块。
示例性的，处理模块，用于对比特流进行调制和相位旋转，得到第一数据流；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；对第二数据流进行处理，得到传输数据流；收发模块，用于发送传输数据流。其中，第一数据流包括多个第一数据，每个第一数据承载n个第一比特，n为大于1的正整数。
示例性的，收发模块，用于接收传输数据流；处理模块，用于对所述传输数据流进行处理，得到第三数据流；对所述第三数据流进行逆滤波处理，得到第四数据流，所述第三数据流的带宽为第三带宽，所述第四数据流的带宽为第四带宽，所述第三带宽小于所述第四带宽；对所述第四数据流进行去相位旋转和解调，得到比特流。
示例性的，处理模块，用于对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；对第一数据流进行功率扩展和相位旋转，得到第二 数据流，第二数据流包括的部分第二数据为复数；对第二数据流进行处理，得到传输数据流；收发模块，用于发送传输数据流。
第四方面提供的装置还可以是网络设备，也可以是网络设备中的装置，例如为芯片，或者是能够与网络匹配使用的装置。
本申请实施例第五方面提供一种数据传输装置，该装置包括处理器，用于实现上述第一方面、第二方面或第三方面描述的方法。该装置还可以包括存储器，用于存储指令和数据。该存储器与该处理器耦合，该处理器执行该存储器中存储的计算机程序或指令时，可以使该装置实现上述第一方面、第二方面或第三方面描述的方法。该装置还可以包括收发器，该收发器用于该装置与其它设备进行通信，示例性的，收发器可以是通信接口、电路、总线、模块等，其它设备可以为网络设备等。
在一种可能的设计中，该装置包括：存储器，用于存储计算机程序或指令；处理器，用于对比特流进行调制和相位旋转，得到第一数据流；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；对第二数据流进行处理，得到传输数据流；收发器，用于发送传输数据流。其中，第一数据流包括多个第一数据，每个第一数据承载n个第一比特，n为大于1的正整数。
在一种可能的设计中，该装置包括：处理器、收发器和存储器。存储器，用于存储计算机程序或指令；收发器，用于接收传输数据流；处理器，用于对所述传输数据流进行处理，得到第三数据流；对所述第三数据流进行逆滤波处理，得到第四数据流，所述第三数据流的带宽为第三带宽，所述第四数据流的带宽为第四带宽，所述第三带宽小于所述第四带宽；对所述第四数据流进行去相位旋转和解调，得到比特流。
在一种可能的设计中，该装置包括：处理器、收发器和存储器。存储器，用于存储计算机程序或指令；处理器，用于对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；对第一数据流进行功率扩展和相位旋转，得到第二数据流，第二数据流包括的部分第二数据为复数；对第二数据流进行处理，得到传输数据流；收发器，用于发送传输数据流。
在一种可能的设计中，该装置包括处理器和接口，处理器通过接口与存储器耦合，当处理器执行存储器中的计算机程序或指令时，使得该装置执行第一方面、第二方面或第三方面提供的方法。第五方面提供的装置还可以是网络设备，该装置包括的收发器用于该装置与终端设备进行通信。
本申请实施例第六方面提供一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行第一方面、第二方面或第三方面提供的方法。
本申请实施例第七方面提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行第一方面、第二方面或第三方面提供的方法。
本申请实施例第八方面提供一种芯片，该芯片包括至少一个处理器和接口，用于从存储器中调用并运行存储器中存储的计算机程序，使得上述第一方面、第二方面或第三方面提供的方法被执行。示例性的，处理器，用于对比特流进行调制和相位旋转，得到第一数据流；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽， 所述第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；对传输数据流进行处理，得到传输数据流；接口，用于输出传输数据流。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图进行说明。
图1为应用本申请实施例的一种网络架构示意图；
图2为DFTs-OFDM技术的处理流程示意图；
图3为BPSK与π/2-BPSK的坐标图；
图4a为一种数据发送方法的流程示意图；
图4b为基于图4a的仿真结果示意图；
图5为本申请实施例提供的数据发送方法的流程示意图；
图6为本申请实施例提供的π/2-4-PAM的调制示例图；
图7为本申请实施例提供的频域截断与频域扩展的示例图；
图8为基于图7的仿真结果示意图；
图9为本申请实施例提供的一种仿真结果示意图；
图10为本申请实施例提供的数据接收方法的流程示意图；
图10a为本申请实施例提供的逆滤波处理的示意图；
图11为本申请实施例提供的上行数据传输的交互流程示意图；
图12为本申请实施例提供的下行数据传输的交互流程示意图；
图12a为本申请实施例提供的共轭对称点的位置以及冗余数据的示意图；
图13为本申请实施例提供的功率扩展示例星座图；
图14为本申请实施例提供的一种装置的结构示意图；
图15为本申请实施例提供的一种终端设备的结构示意图；
图16为本申请实施例提供的另一种装置的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请实施例的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a和b，a和c，b和c，或a和b和c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同或相似的技术特征进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
本申请实施例可以应用于长期演进(long term evolution，LTE)系统中；也可以应用于第五代(5 th-generation，5G)通信系统中，5G通信系统也可以称为新空口(new radio，NR)系统；还可以应用于未来通信系统，例如未来网络或第六代通信系统等。
本申请实施例可以应用于设备到设备(device to device，D2D)系统，机器到机器(machine to machine，M2M)系统、车与任何事物通信的车联网(vehicle to everything，V2X)系统等。
本申请实施例可以应用于各种场景中，例如下一代微波场景、基于NR的微波场景或回传(integrated access backhaul，IAB)场景等。
请参见图1，为应用本申请实施例的一种网络架构示意图。该网络架构可包括一个网络设备和一个终端设备，图1所示的设备数量和形态用于举例并不构成对本申请实施例的限定，实际应用中可以包括两个或两个以上的网络设备，两个或两个以上的终端设备。
本申请中，网络设备可以是任意一种具有无线收发功能的设备。包括但不限于：LTE中的演进型基站(evolutional Node B，NodeB或eNB或e-NodeB)，NR中的基站(gNodeB或gNB)或收发点(transmission receiving point/transmission reception point,TRP)，3GPP后续演进的基站，WiFi系统中的接入节点，无线中继节点，无线回传节点等。基站可以是：宏基站，微基站，微微基站，小站，中继站，或，气球站等。多个基站可以支持上述提及的同一种技术的网络，也可以支持上述提及的不同技术的网络。基站可以包含一个或多个共站或非共站的TRP。网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)，和/或，分布单元(distributed unit,DU)。网络设备还可以是服务器，可穿戴设备，或车载设备等。以下以网络设备为基站为例进行说明。所述多个网络设备可以为同一类型的基站，也可以为不同类型的基站。基站可以与终端进行通信，也可以通过中继站与终端进行通信。终端可以与不同技术的多个基站进行通信，例如，终端可以与支持LTE网络的基站通信，也可以与支持5G网络的基站通信，还可以支持与LTE网络的基站以及5G网络的基站的双连接。
终端设备是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、车载终端设备、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、可穿戴终端设备等等。本申请的实施例对应用场景不做限定。终端有时也可以称为终端设备、用户设备(user equipment，UE)、接入终端设备、车载终端、工业控制终端、UE单元、UE站、移动站、移动台、远方站、远程终端设备、移动设备、UE终端设备、无线通信设备、UE代理或UE装置等。终端设备也可以是固定的或者移动的。
本申请实施例可以应用于网络设备与终端设备之间传输数据的场景，可以是下行传输场景，也可以是上行传输场景。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面将对本申请实施例涉及的名称或技术进行介绍。
(1)离散傅里叶变换扩频的正交频分复用(discrete Fourier transform spreading orthogonal frequency division multiplexing，DFTs-OFDM)
DFTs-OFDM技术是长期演进(long term evolution，LTE)的上行链路的信号生成方式之一。DFTs-OFDM技术在传统的正交频分复用(orthogonal frequency division multiplexing，OFDM)处理过程之前有一个额外的离散傅里叶变换(discrete Fourier transform，DFT)处理，因此DFTs-OFDM技术也可以称为线性预编码OFDM技术。在一些文献中，DFT-s-OFDM技术也被称为单载波频分复用接入(single carrier-frequency division multiple access，SC-FDMA)。
可参见图2，为DFTs-OFDM技术的处理流程示意图。发送端对时域离散序列依次进行串并(serial-to-parallel)转换、N点DFT、子载波映射、M点反离散傅里叶变换(inverse discrete Fourier transform，IDFT)、并串(parallel-to-serial)转换、添加循环前缀(cyclic prefix，CP)以及数模转换(digital to analog converter，DAC)处理，得到传输数据流，之后通过天线端口以及信道(channel)将传输数据流发送接收端。接收端通过信道和天线端口接收到该传输数据流时，对该传输数据流依次进行模数转换(analog to digital converter，ADC)、去循环前缀、串并(serial-to-parallel)转换、M点DFT、去子载波映射/均衡(equalization)、N点IDFT以及并串(parallel-to-serial)转换，以得到时域离散序列。
发送端通过N点DFT，可以获取时域离散序列的频域序列。该频域序列子载波映射后输入IDFT，进行M点IDFT，N<M。由于IDFT的长度大于DFT的长度，因此IDFT多的那一部分输入时用零补齐。在IDFT之后，添加循环前缀可以避免符号干扰。
由于N<M并且用零补齐IDFT，因此输出的传输数据流的PAPR比采用OFDM技术的PAPR低，可以提高终端设备的功率发射效率，延长电池的使用时间，降低终端设备成本。
(2)频域赋型(frequency domain spectral shaping，FDSS)
一组离散时域数据信号经过DAC后输出的模拟连续信号的峰均比与该组离散时域数据之间的相关性有一定的关系。该组离散时域数据信号可以是图2中添加循环前缀后的时域数据信号，DAC输出的模拟连续信号可以是图2中DAC输出的传输数据流。
假设一组离散时域数据信号y(n)与一组时延离散数据d(n)卷积后，获得yd(n)：
Figure PCTCN2020109013-appb-000001
假设和经过DAC后输出的模拟连续信号的峰均比分别为PAPR 1和PAPR 2。如果d(n)为一组设计好的权重系数序列的话，则yd(n)中相邻数据之间的相关性比y(n)中相邻数据之间的相关性好。所以，PAPR 1小于PAPR 2。因此，一组离散时域数据与设计好的一组离散数据卷积后，可以有效地降低PAPR。
根据卷积定理，两个时域信号的卷积操作可以等效于该两个时域信号在频域内的点乘操作。因此将一组离散时域数据经过DFT之后变成离散频域数据，然后点乘设计好的频谱 赋型(spectrum shaping)序列，再经过IDFT之后的时域信号就可以有效地降低PAPR。由于点乘操作的复杂度低于卷积操作的复杂度，这种降PAPR的技术在频域中操作更好，因此称这种技术为频域赋型。
如果将FDSS技术应用于5G上行的DFTs-OFDM波形处理中，可以进一步降低5G上行信号的PAPR。基本思路为：在DFTs-OFDM波形处理过程的DFT之后和反快速傅里叶变换(inverse fast Fourier transmission，IFFT)之前的频域数据中，点乘设计好的频谱赋型序列即可。点乘运算操作，一般是指两个矢量序列或矩阵中的元素，依次对应相乘。运算后可以得到一个与点乘运算前，同维度的矢量或矩阵。
(3)二进制相移键控(binary phase shift keying，BPSK)调制与π/2-BPSK调制
π/2-BPSK调制是BPSK调制的一种增强。BPSK调制中，输入比特“1”与输入比特“0”之间的相位差为π或-π，即相位差绝对值为π。而π/2-BPSK调制中，第k个调制符号与第k-1个调制符号之间的相位差为π/2或-π/2，即相位差绝对值为π/2。示例性的，第一个调制符号根据第一个输入比特“1”或“0”在{+1，-1}中选择一个，例如第一个输入比特为“1”选择+1，第二个输入比特为“0”选择-1；第二个调制符号根据第二个输入比特在{+j，-j}中选择一个，例如第二个输入比特为“1”选择+j，第二个输入比特为“0”选择-j；第三个调制符号根据第三个输入比特在{+1，-1}中选择一个，第四个调制符号根据第四个输入比特在{+j，-j}中选择一个，以此类推。其中，第k个调制符号为调制符号流中的任意一个调制符号，π为圆周率。
可参见图3所示的BPSK与π/2-BPSK的坐标图。BPSK调制中，输入比特“1”→“0”或“0”→“1”的转换过程中会有相位差绝对值为π的相位突变，这会导致信号的PAPR升高。而π/2-BPSK调制中，相邻两个调制符号之间的相位差绝对值为π/2，从π将为π/2，可以抑制信号的PAPR。
可以理解的是，采用π/2-BPSK调制得到的调制符号，是在采用BPSK调制得到的调制符号的基础上进行相位旋转得到的，相位旋转因子为e k×j×π/2，e k×j×π/2＝cos(k×π/2)+j×sin(k×π/2)，k表示调制符号的索引，索引可以从“0”开始编号，或可以从“1”开始编号。例如，索引从“0”开始编号，采用BPSK调制得到的调制符号包括1,-1,1,1,-1,1；那么采用π/2-BPSK调制得到的调制符号包括1,-j,-1,-j,-1,j。
(4)脉冲幅度调制(pulse amplitude modulation，PAM)
PAM是将一连串的模拟信号用脉冲信号取样调制，借此将原始信号的幅度截取出来的调制方式。这是一种模拟脉冲调制的方式，其原始信号承载于一串行的脉冲载波，载波间的时间间隔是固定的，而脉冲载波上数值的大小则依据原始信号的幅度而定。PAM的解调为侦测各脉冲载波上的幅度大小再加以还原。
对调制结果而言，采用BPSK得到的调制结果，可以等效于采用调制阶数为2的PAM得到的调制结果。请参见图4a，为一种数据发送方法的流程示意图。发送端对输入信息比特按照BPSK调制方式进行调制，对调制后的符号进行π/2的相位旋转，对相位旋转后的符号进行DFT，对DFT后的符号进行IFFT，对IFFT后的符号添加循环前缀，向接收端发送添加循环前缀后的数据。对相位旋转后的符号进行DFT之后，可对DFT后的符号进行FDSS，然后对FDSS后的符号进行IFFT，这样可以降低PAPR。
图4a中的FDSS一般采用频谱扩展的升余弦滚降滤波器，扩展后符号占用的带宽是原有带宽的1+α倍，其中α为滤波器滚降因子。例如，原有带宽为10MHz，进行α＝0.2的FDSS之后，占用的带宽为12MHz。图4a中的FDSS还可以采用频谱扩展的根升余弦滚降滤波器等，以实现频谱扩展，具体采用何种滤波器在本申请实施例中不作限定。
请参见图4b，为基于图4a的仿真结果示意图。图4b中横坐标表示发送数据的PAPR，纵坐标表示发送数据的PAPR的互补累积分布函数(complementary cumulative distribution function，CCDF)。如图4b所示：曲线①为数据的调制方式是π/2-BPSK调制时，采用DFTs-OFDM+FDSS得到的发送数据的PAPR的CCDF；曲线②为数据的调制方式是BPSK调制时，采用DFTs-OFDM+FDSS得到的发送数据的PAPR的CCDF；曲线③为数据的调制方式是π/2-BPSK调制时，采用DFTs-OFDM得到的发送数据的PAPR的CCDF；④为数据的调制方式是BPSK调制时，采用DFTs-OFDM得到的发送数据的PAPR的CCDF。
从图4b所示的仿真结果可知，采用π/2-BPSK的PAPR比单纯BPSK的PAPR低，采用FDSS的PAPR比不采用FDSS的PAPR低，π/2-BPSK+FDSS的PAPR最低，接近1，即峰值功率近乎等于平均功率。
不过图4a中，采用π/2-BPSK的调制方式，一个调制符号只能携带1比特的信息，导致频谱效率低下。并且，图4a中采用FDSS实现的是频域扩展，使得发送数据最终占用的带宽大于配置的带宽。
鉴于此，本申请实施例提供一种数据传输方法及其装置，通过频域滤波以降低传输数据的PAPR，频域滤波可以使得传输数据最终占用的带宽小于配置的带宽，可以提高频域资源的利用率。另外，本申请实施例中调制数据承载两个或两个以上比特，可以提高频谱效率。
下面将对本申请实施例提供的数据传输方法进行介绍。
请参见图5，为本申请实施例提供的数据发送方法的流程示意图。图5所示的数据发送方法由发送端执行，发送端可以是图1所示网络架构中的网络设备，也可以是图1所示网络架构中的终端设备。图5所示的流程可以包括但不限于如下步骤：
步骤101，对第一比特流进行调制和相位旋转，得到第一数据流。
发送端对第一比特流进行调制和相位旋转，得到第一数据流。
其中，第一数据流包括多个第一数据，每个第一数据承载n个第一比特，n为大于1的正整数。
其中，调制的调制方式可以是PAM，其调制阶数可以是4、8、16或更大。调制阶数为4的PAM，可以表示为4-PAM、4PAM、PAM4或PAM-4等。调制阶数为8的PAM，可以表示为8-PAM、8PAM、PAM8或PAM-8等。具体采用何种方式表示不作限定，本申请实施例以N-PAM为例，N为调制阶数。
调制阶数与每个第一数据承载的第一比特的数量n有关，调制阶数可以表示为2 n，其上标n即为每个第一数据承载的第一比特的数量。例如，调制阶数为4时，即4-PAM，每个第一数据可承载2个第一比特，这2个比特可表示4种离散脉冲幅度。再例如，调制阶数为8时，即8-PAM，每个第一数据可承载3个第一比特，这3个比特可表示8种离散脉冲幅度。
具体的，发送端先对第一比特流进行调制，得到第一调制数据流；再对第一调制数据流进行相位旋转，得到第一数据流。
其中，第一比特流可以是编码后的比特流，包括多个第一比特，第一比特可以是比特“1”或比特“0”，那么第一比特流为由比特“1”和比特“0”组成的一组比特流，具体采用何种编码方式进行编码在本申请实施例中不作限定。多个指的是两个或两个以上。第一比特流还可以描述为输入信息比特流、待发送比特流或时域离散序列等。
第一调制数据流包括多个第一调制数据，每个第一调制数据为实数，即不包括虚部。第一调制数据也可以描述为第一调制符号，每个第一调制符号承载n个第一比特。例如调制方式为4-PAM，每个第一调制符号承载2个第一比特。n的具体取值与调制阶数有关。
对第一调制数据流进行相位旋转，得到第一数据流。具体为将每个第一调制数据与相位旋转因子相乘，得到第一数据流。其中，相位旋转因子可表示e k×j×ω，ω可以是π/2或π/4等，k表示第一调制数据的索引，索引可以从“0”开始编号，或可以从“1”开始编号。具体的，假设索引从“0”开始编号，ω为π/2时，第一个第一调制数据与相位旋转因子e 0相乘，得到第一个第一数据；第二个第一调制数据与相位旋转因子e 1×j×π/2相乘，得到第二个第一数据；第三个调制数据与相位旋转因子e 2×j×π/2相乘，得到第三个第一数据，以此类推，可以得到第一数据流。
若ω为π/2，可以使得相邻两个第一调制数据之间的相位差绝对值为π/2。ω为π/2，调制方式为PAM时，那么调制+相位旋转可以认为是π/2-4-PAM的调制方式。
若ω为π/4，可以使得相邻两个第一调制数据之间的相位差绝对值为π/4。ω为π/4，调制方式为PAM时，那么调制+相位旋转可以认为是π/4-4-PAM的调制方式。
其中，第一数据流包括的部分第一数据为复数。部分第一数据可以是第一数据流中编号为奇数的第一数据，也可以是第一数据流中编号为偶数的第一数据，视第一数据流的编号规则以及相位旋转因子而定。
由于第一数据流为经过调制和相位旋转得到的，因此可以将第一数据流认为是调制数据流，该调制数据流包括两部分，一部分是实数(只包括实部)，另一部分是复数(只包括虚部，或包括实部和虚部)。
示例性的，可参见图6，为本申请实施例提供的π/2-4-PAM的调制示例图。图6中，第一比特流包括{0,1,1,0,0,0,1,1}这8个第一比特。在4-PAM调制中，“00”的幅度为-3，“01”的幅度为-1，“11”的幅度为+1，“10”的幅度为+3。需要说明的是，4-PAM调制中各个幅度为归一化之前的幅度。对第一比特流进行4-PAM调制，得到第一调制数据，第一调制数据包括{-1,+3,-3,+1}，可见第一调制数据均为实数。然后对第一调制数据进行相位旋转，相位旋转因子为e k×j×π/2，第一个第一调制数据-1与相位旋转因子e 0相乘，得到第一个第一数据-1；第二个第一调制数据+3与相位旋转因子e 1×j×π/2＝cos(π/2)+j×sin(π/2)＝j相乘，得到第二个第一数据+3j；第三个第一调制数据-3与相位旋转因子e 2×j×π/2＝cos(π)+j×sin(π)＝-1相乘，得到第三个第一数据+3；第四个第一调制数据+1与相位旋转因e 3×j×π/2＝cos(3π/2)+j×sin(3π/2)＝-j相乘，得到第四个第一数据-j，进而得到图6所示的第一数据包括{-1,+3j,+3,-j}。可见，第一数据中第一个和第三个数据为实数，第二个和第四个数据为两个复数。第一数据包括{-1,+3j,+3,-j}，基于第一调 制数据的索引从“0”开始编号，若第一调试数据的索引从“1”开始编号，那么第一数据包括{-j,-3,+3j,+1}，该情况下，第一数据中第一个和第三个数据为复数，第二个和第四个数据为实数。
在一种可能的实现方式中，若发送端为终端设备，那么终端设备可根据网络设备指示的调制方式对第一比特流进行调制，或根据网络设备指示的调制方式对第一比特流进行调制和相位旋转，具体将在图11所示的实施例中进行介绍。
在一种可能的实现方式中，若发送端为网络设备，那么网络设备可将其对第一比特流进行调制的调制方式告知终端设备，或将其对第一比特流进行调制和相位旋转的调制方式告知终端设备，具体将在图12所示的实施例中进行介绍。
步骤102之前，发送端对第一数据流进行离散傅里叶变换。这是本领域中的一种惯用操作。经过离散傅里叶变换后，时域序列变换到了频域。
步骤102，对第一数据流进行滤波处理，得到第二数据流。
发送端对经离散傅里叶变换后的第一数据流进行滤波处理，得到第二数据流。第一数据流经过离散傅里叶变换为频域数据，其在频域对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽。第二带宽小于第一带宽，可以理解为是频域截断或频域削减后的效果。
其中，滤波(filtering)处理的效果是使得第二带宽小于第一带宽，滤波处理也可以描述为整形(shaping)处理，或者描述为截断(truncate)处理，即截断处理可以实现第二带宽小于第一带宽，其他用于描述可以实现第二带宽小于第一带宽的技术名称理应落入本申请实施例的保护范围。
本申请实施例中，发送端在频域对第一数据流进行截断处理。具体的，发送端先对第一数据流进行DFT，得到第一数据流的频域数据，然后对第一数据流的频域数据进行滤波处理，得到第二数据流，第二数据流即为频域数据。
滤波处理可通过FDSS实现，该FDSS与图4a中的FDSS不同。该FDSS可称为频率截断(frequency truncate，FT)，而图4a中的FDSS实现频域扩展。例如发送端为终端设备，网络设备为终端设备配置的传输带宽为10MHz，通过该FDSS的滤波处理后，占用8MHz，而按照图4a中的FDSS处理后，占用12MHz。
在频域进行滤波处理相比在时域进行滤波处理，计算量小，实现简单。因为在频域进行滤波处理是做乘法，而在时域进行滤波处理是做卷积。在时域进行滤波处理可包括：对第一数据流依次进行DFT和IFFT，然后卷积滤波函数，得到第二数据流，第二数据流为时域数据。时域滤波处理也可以实现频域截断，存在计算量大，实现较为复杂的缺陷。
在一种可能的实现方式中，若发送端为终端设备，那么终端设备可根据网络设备的指示对第一数据流进行滤波处理，具体将在图12所示的实施例中进行介绍。
示例性的，网络设备指示终端设备进行滤波处理的滤波参数，该滤波参数包括滚降因子，滚降因子用于描述滤波器边缘下降斜率，滚降因子也可以描述为扩展因子，用α表示，α小于1，例如为0.2。终端设备根据所指示的滚降因子对第一数据流进行滤波处理。
在一种可能的实现方式中，若发送端为网络设备，那么网络设备可将其进行滤波处理的相关信息告知终端设备，具体将在图13所示的实施例中进行介绍。
进一步的，步骤102之后还包括：
步骤103，对第二数据流进行处理，得到第一传输数据流。
发送端对第二数据进行处理，得到第一传输数据流。该处理用于将频域数据变换为时域数据。该处理可以是时域处理，时域处理可包括图5所示的IFFT和添加循环前缀。需要说明的是，图5中步骤103中的处理包括IFFT和添加循环前缀用于举例，并不构成对本申请实施例的限定，例如，实际场景下，添加循环前缀之后还可以包括数模转换，即步骤103中的处理可以包括IFFT、添加循环前缀和数模转换。进一步的，图5所示流程中的各个流程用于举例，并不构成对本申请实施例的限定，例如，实际场景下，IFFT之前还可以包括子载波映射。
步骤104，发送第一传输数据流。
发送端向接收端发送第一传输数据流。相应的，接收端从发送端接收第一传输数据流。第一传输数据流对应的带宽即为第二数据流对应的带宽，小于第一数据流对应的带宽，实现频域截断。
可以理解的是，第一传输数据流对应的带宽为第一传输数据流最终占用的带宽，第一数据流对应的带宽为调制数据流映射至频域占用的带宽。
在图5所示的实施例中，发送端通过滤波处理实现频域截断，使得第一传输数据流最终占用的带宽小于调制数据流映射至频域的带宽，并且可以降低第一传输数据流的PAPR。另外，采用高阶π/2-PAM的调制方式，使得一个调试符号可以承载n个第一比特，从而提高频谱效率。本申请实施例提供的频域截断，对于n＝1的情况下，也适用，例如调制方式为π/2-BPSK或π/2-2PAM等。
下面通过两个示例对本申请实施例的效果进行介绍。
示例1，本申请实施例采用π/2-4-PAM，将π/2-4-PAM与16-正交幅度调制(quadrature amplitude modulation，QAM)进行对比。16-QAM中，每个调制符号承载4个比特，π/2-4-PAM中，每个调制符号承载2个比特，可见16-QAM每个调制符号承载的比特数是π/2-4-PAM的两倍。因此在输入比特流的比特数相同的情况下，调制符号映射到频域后占用的带宽，π/2-4-PAM是16-QAM的两倍。为了降低PAPR，π/2-4-PAM+FDSS进行频域截断，16-QAM+FDSS进行频域扩展，使得两者最终占用的带宽相同，可参见表1，表1中带宽以物理资源块(physical resource block，PRB)为单位。
表1
调制方式 调制符号映射至频域的带宽 频域截断/扩展后的带宽
π/2-4-PAM 100PRB 60PRB
16-QAM 50PRB 60PRB
表1中，滚降因子α＝0.2。对于16-QAM+FDSS而言，50PRB*1.2＝60PRB。对于π/2-4-PAM+FDSS采用滚降因子为0.2的滤波器，使得100PRB→60PRB。可参见图7所示的频域截断与频域扩展的示例图。图7中，频域数据的带宽即为调制符号映射至频域的带宽，输出数据的带宽即为频域截断/扩展后的带宽。请参见图8，为基于图7的仿真结果示意图。图8中，采用π/2-4-PAM+FDSS的PAPR比采用16-QAM+FDSS的PAPR低0.6dB(10 -4)。可见，在输入比特流的比特数相同的情况下，π/2-4-PAM+频域截断的效果好于 16-QAM+频域扩展的效果。
可以理解的是，在发送端采用π/2-4-PAM+频域截断与采用16-QAM+频域扩展发送相同数量的数据，输出数据占用相同带宽的情况下，π/2-4-PAM+频域截断对输出数据的PAPR抑制效果更好。
示例2，本申请实施例采用π/2-BPSK，将π/2-BPSK与正交相移键控(quadrature phase shift keying，QPSK)进行对比。QPSK中，每个调制符号承载2个比特，相邻两个调制符号之间的相位差绝对值为π/2；π/2-BPSK中，每个调制符号承载1个比特，可见QPSK每个调制符号承载的比特数是π/2-BPSK的两倍。因此在输入比特流的比特数相同的情况下，调制符号映射到频域后占用的带宽，π/2-BPSK是QPSK的两倍。为了降低PAPR，π/2-BPSK+FDSS进行频域截断，QPSK+FDSS进行频域扩展，使得两者最终占用的带宽相同，可参见表2。
表2
调制方式 调制符号映射至频域的带宽 频域截断/扩展后的带宽
π/2-BPSK 100PRB 60PRB
QPSK 50PRB 60PRB
表2中，滚降因子α＝0.2。对于QPSK+FDSS而言，50PRB*1.2＝60PRB。对于π/2-BPSK+FDSS采用滚降因子为0.2的滤波器，使得100PRB→60PRB。请参见图9，为一种仿真结果示意图，该仿真结果基于表2。图9中，采用π/2-BPSK+FDSS的PAPR比采用QPSK+FDSS的PAPR低0.6dB(10 -4)。可见，在输入比特流的比特数相同的情况下，π/2-BPSK+频域截断的效果好于QPSK+频域扩展的效果。
可以理解的是，在发送端采用π/2-BPSK+频域截断与采用QPSK+频域扩展发送相同数量的数据，输出数据占用相同带宽的情况下，π/2-BPSK+频域截断对输出数据的PAPR抑制效果更好。将本申请实施例采用的π/2-BPSK+频域截断与图4a所示的π/2-BPSK+频域扩展进行仿真对比，同样可得π/2-BPSK+频域截断对输出数据的PAPR抑制效果更好。因此，频域截断既可以与高阶π/2-PAM结合对输入比特流进行处理，也可以与π/2-BPSK结合对输入比特流进行处理，以达到降低PAPR的目的。
图5所示流程为发送端发送数据的过程，请参见图10，为本申请实施例提供的数据接收方法的流程示意图，即为接收端接收数据的过程。可以理解的是，接收端接收数据的过程是发送端发送数据的逆过程。接收端可以是图1所示网络架构中的网络设备，也可以是图1所示网络架构中的终端设备。图10所示的流程可以包括但不限于如下步骤：
步骤201，接收第二传输数据流。
接收端通过天线端口和信道从发送端接收第二传输数据流。第二传输数据流可以是第一传输数据流，也可以是其他传输数据流。第二传输数据流为时域数据。
步骤202，对第二传输数据流进行处理，得到第三数据流。
接收端对第二传输数据进行处理，得到第三数据流，第三数据流为频域数据。该处理用于将时域数据变换为频域数据。该处理可以包括图10所示的去循环前缀和DFT，也可以包括去循环前缀和快速傅里叶变换(fast Fourier transmission，FFT)。需要说明的是，图10中步骤202中的处理包括去循环前缀和DFT用于举例，并不构成对本申请实施例的限定， 例如，实际场景下，去添加循环前缀之前还可以包括模数转换，即步骤202中的处理可以包括去循环前缀、DFT和模数转换。
步骤203，对第三传输数据流进行逆滤波处理，得到第四数据流。
接收端对第三传输数据流进行逆滤波处理，得到第四数据流。第四数据流对应的带宽为第四带宽，第三数据流对应的带宽为第三带宽，第三带宽小于第四带宽。
发送端采用高阶π/2-PAM调制方式进行调制得到的调制符号，等效于时域数据序列经过DFT变换到频域后，再进行N/4点移位，并以频域数据序列N/4位置的数据点为中心共轭对称。其中，N为时域数据序列的长度或DFT变换长度(即N点DFT)，时域数据序列为时域纯实数据序列，即只包括实部的时域数据序列。因此接收端接收到的截断后数据包含原始所有信息。即接收端接收的带宽为第三带宽的第三数据流包括频域截断之前的数据流的所有信息，以便接收端可以恢复发送端发送的数据。
逆滤波处理可以包括但不限于如下操作：在频域上对频域数据进行移位，复制部分数据，对复制的数据求取共轭等。可参见图10a所示的逆滤波处理的示意图。发送端截断后的频域数据如图10a中左侧所示，对其进行移位、复制部分数据以及对复制的数据求取共轭等操作，可以得到如图10a中右侧所示，即发送端频域截断前的频域数据。
逆滤波处理的效果是，可以使得第四带宽大于第三带宽。逆滤波处理这个名称用于举例，并不构成对本申请实施例的限定。
在进行逆滤波处理之后，可进行IDFT或IFFT处理，得到第四数据流为时域数据，以便对时域数据进行去相位旋转和解调。或者，逆滤波处理包括IDFT或IFFT，使得第四数据流为时域数据。
步骤204，对第四数据流进行去相位旋转和解调，得到第二比特流。
接收端先对第四数据流进行去相位旋转，再进行解调，得到第二比特流。在进行相位旋转时是乘以相位旋转因子e k×j×ω，那么去相位旋转因子时乘以相位旋转因子e -k×j×ω，或除以相位旋转因子e k×j×ω。
解调时的调制方式与调制时的调制方式一致，例如调制的调试方式为4-PAM，那么解调的调制方式为4-PAM。
图10所示的实施例中，接收端通过逆滤波处理以恢复发送端发送的频域数据。
图5描述发送端发送数据的过程，图10描述接收端接收数据的过程。下面将从网络设备与终端设备交互的角度进行介绍，分为上行数据传输和下行数据传输两个过程。
请参见图11，为本申请实施例提供的上行数据传输的流程示意图，可以包括但不限于如下步骤：
步骤301，网络设备向终端设备发送第一指示信息。相应的，终端设备从网络设备接收第一指示信息。
其中，第一指示信息用于指示终端设备如何对第一比特流进行处理，第一比特流可以理解为终端设备将要发送的比特流，即待发送比特流。第一指示信息可以包括第一处理指示信息和/或第二处理指示信息。
上述第一处理指示信息用于指示第一调制方式，终端设备可根据第一调制方式进行调制。第一处理指示信息存在以下几种方式：
方式一，第一处理指示信息为目前的(modulation and coding scheme，MCS)索引(index)，即通过目前的MCS索引对第一调制方式进行指示。目前的MCS索引可以指示PAM、QAM、BPSK、QPSK等调制方式以及调制阶数，那么第一调制方式为PAM、QAM、BPSK、QPSK等+调制阶数。该方式下，终端设备可默认在调制之后进行相位旋转，例如π/2的相位旋转。
方式二，第一处理指示信息为新定义的MCS索引，即通过新定义的MCS索引对第一调制方式进行指示。新定义的MCS索引可以指示π/2-4-PAM、π/2-BPSK等π/2调制方式，那么第一调制方式为π/2-4-PAM、π/2-BPSK等。该方式中，终端设备可根据4-PAM、BPSK等调制方式进行调制，再进行π/2的相位旋转。MCS表格的内容与现有技术类似，包括MCS索引与调制方式的对应关系，还可以包括编码速率，频谱效率等信息。当终端设备没有收到第一处理指示信息时，MCS索引指示终端设备按照QPSK、16-QAM、64-QAM的MCS表格确定调制阶数和码率。
方式三，第一处理指示信息为目前的MCS索引+额外指示信息，目前的MCS索引可以指示PAM、QAM、BPSK、QPSK等调制方式以及调制阶数，额外指示信息用于指示相位旋转，例如指示π/2的相位旋转。该种方式下，第一调制方式为PAM、QAM、BPSK、QPSK等+调制阶数。
这三种方式用于举例，并不构成对本申请实施例的限定。
上述第二处理指示信息用于指示终端设备如何进行滤波处理，终端设备可根据第二处理指示信息进行滤波处理。第二处理指示信息存在以下几种方式：
方式一，第二处理指示信息包括第一带宽指示信息、第二带宽指示信息或第一带宽与第二带宽之间的比值中的一种或多种。第一带宽指示信息用于指示第一带宽，第二带宽指示信息用于指示第二带宽和/或第二带宽的中心频点。
其中，第一带宽为原始数据带宽，即调制和相位旋转后的数据占用的带宽，也即第一数据流对应的带宽。第二带宽为输出数据占用的带宽，即第一传输数据流占用的带宽，也即第二数据流对应的带宽。
方式二，第二处理指示信息用于指示第一滤波参数，第一滤波参数包括第一滚降因子。可选的，第一滤波参数或第一指示信息还包括滤波器类型，滤波器类型指示滤波器的函数类型，可以包括但不限于升余弦函数、根升余弦函数、凯撒窗函数等函数。
方式三，第二处理指示信息用于指示第二带宽，第二带宽即最终空口信号实际占用的带宽。例如，当终端设备收到来自网络设备的第二处理指示信息，采用截断的π/2-BPSK调制，并且给定带宽时，终端设备生成大于第二带宽的数据，并在调制后在频域进行截断，以匹配第二带宽。
这两种方式用于举例，并不构成对本申请实施例的限定。
在第一指示信息包括第二处理指示信息，不包括第一处理指示信息的情况下，终端设备可默认采用一种调制方式进行调制，该调制方式对于终端设备和网络设备均可知，例如协议约定终端设备采用4-PAM进行调制，网络设备采用4-PAM进行解调。
在第一指示信息包括第一处理指示信息，不包括第二处理指示信息的情况下，终端设备可按照预定义参数进行滤波处理，该预定义参数对于终端设备和网络设备均可知，例如 该预定义参数为滚降因子α＝2，那么终端设备根据滚降因子α＝2进行滤波处理，网络设备根据滚降因子α＝2进行逆滤波处理。
可以理解的是，第一指示信息包括一种处理指示信息的情况下，另一种处理指示信息可以采用默认的或预定义的。进一步的，第一处理指示信息和第二处理指示信息均可以是默认的或预定义的。该种情况下，无需执行步骤301。
可选的，第一指示信息还包括第一传输资源指示信息，第一传输资源指示信息用于指示网络设备为终端设备的上行传输分配的第一时频资源，以便终端设备在第一时频资源上向网络设备发送第一传输资源。第一传输资源指示信息除了指示第一时频资源之外，还可以指示上行传输的空域资源、码域资源等。
在一种可能的实现方式中，步骤301可包括：301a，网络设备向终端设备发送第一处理指示信息；301b，网络设备向终端设备发送第二处理指示信息；301c，网络设备向终端设备发送第一传输资源指示信息中的一种或多种。若包括301a和301b，第一处理指示信息和第二处理指示信息可携带在同一消息中，也可携带在不同消息中。若包括301a、301b和301c，第一传输资源指示信息与第一处理指示信息可以携带在同一消息中，也可携带在不同消息中；第一传输资源指示信息与第二处理指示信息可以携带在同一消息中，也可携带在不同消息中；第一传输资源指示信息与第一处理指示信息和第二处理指示信息可以携带在同一消息中，例如第一指示信息包括第一传输资源指示信息、第一处理指示信息和第二处理指示信息，也可携带在三条不同消息中。
步骤302，终端设备根据第一指示信息对第一比特流进行处理，得到第一传输数据流。
在网络设备执行步骤301的情况下，终端设备根据第一处理指示信息进行调制和相位旋转，得到第一数据流；根据第二处理指示信息进行滤波处理，得到第二数据流；对第二数据流进行处理，得到第一传输数据流。步骤302与图5所示的流程类似，不同之处在于，步骤302中根据处理指示信息进行处理。
终端设备根据第一处理指示信息进行调制和相位旋转，得到第一数据流，可包括：
对于第一处理指示信息的方式一，终端设备根据第一调制方式进行调制，得到第一调制数据流，第一调制数据流所包括的第一调制数据为实数；默认对第一调制数据流进行相位旋转，得到第一数据流。
对于第一处理指示信息的方式二，终端设备根据第一调制方式进行调制和相位旋转，得到第一数据流。
对于第一处理指示信息的方式三，终端设备根据第一调制方式进行调制，得到第一调制数据流，根据额外指示信息对第一调制数据流进行相位旋转，得到第一数据流。
终端设备根据第二处理指示信息进行滤波处理，得到第二数据流，可包括：
对于第一处理指示信息的方式一，若第二处理指示信息包括第一带宽指示信息和第二带宽指示信息，那么终端设备根据第一带宽和第二带宽对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。若第二处理指示信息包括第一带宽指示信息和第一带宽与第二带宽之间的比值，那么终端设备根据第一带宽和该比值确定第二带宽，再根据第二带宽对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。若第二处理指示信息包括第一带宽和第一带宽与第 二带宽之间的比值，那么终端设备根据第二带宽和该比值确定第一带宽，根据第一带宽和第二带宽对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。若第二处理指示信息包括第一带宽指示信息，那么终端设备可获取第二带宽，具体如何获取方式不限定，第二带宽可通过其他指示信息进行指示；再根据第一带宽和第二带宽对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。若第二处理指示信息包括第二带宽指示信息，那么终端设备可获取第一带宽，具体如何获取方式不限定，第一带宽可通过其他指示信息进行指示；再根据第一带宽和第二带宽对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。若第二处理指示信息包括第一带宽和第一带宽与第二带宽之间的比值，那么终端设备获取第一带宽或第二带宽，具体如何获取方式不限定，再确定第二带宽或第一带宽，然后对第一数据流的频域数据进行频域截断，使得频域截断后的第二数据流对应的带宽为第二带宽。
对于第一处理指示信息的方式二，终端设备直接根据第一滚降因子对第一数据流的频域数据进行频域截断，使得第二带宽小于第一带宽。例如第一滚降因子为0.2。
在网络设备不执行步骤301的情况下，终端设备根据默认的或预定义的调制方式进行调制和相位旋转，根据默认的或预定义的滚降因子进行滤波处理，得到第二数据流。
步骤303，终端设备向网络设备发送第一传输数据流。相应的，网络设备从终端设备接收第一传输数据流。
可选的，第一指示信息还包括第一传输资源指示信息，第一传输资源指示信息用于指示第一时频资源，终端设备在第一时频资源上，向网络设备发送第一传输数据流。
步骤304，网络设备对第一传输数据流进行处理，得到第一比特流。
网络设备在接收到第一传输数据流的情况下，若网络设备执行了步骤301，那么网络设备根据第一指示信息所指示的信息对第一传输数据流进行处理，得到第一比特流。步骤304与图10所示的流程类似，不同之处在于，步骤304中根据所指示的信息进行处理。例如，网络设备根据第一调制方式进行解调，或根据第一调制方式进行去相位旋转和解调。
若网络设备未执行步骤301，那么网络设备根据默认的或预定义的信息对第一传输数据流进行处理。
在图11所示的实施例中，终端设备根据网络设备下发的第一指示信息对第一比特流进行处理，得到第一传输数据流并向网络设备发送第一传输数据流，第一指示信息可以实现频域截断，从而降低第一传输数据流的PAPR。
请参见图12，为本申请实施例提供的下行数据传输的流程示意图，可以包括但不限于如下步骤：
步骤401，网络设备对第二比特流进行处理，得到第二传输数据流。
步骤401的执行过程可参见图10所示的数据发送过程，在此不再赘述。
步骤402，网络设备向终端设备发送第二传输数据流。相应的，终端设备从网络设备接收第二传输数据流。
网络设备通过天线端口和信道向终端设备发送第二传输数据流。
步骤403，网络设备向终端设备发送第二指示信息。相应的，终端设备从网络设备接 收第二指示信息。
其中，第二指示信息用于指示网络设备在步骤401如何对第二比特流进行的处理，以便终端设备在接收到第二传输数据流时，可以进行逆操作，以得到第二比特流。第二比特流可以理解为网络设备将要发送的比特流。第二指示信息包括第三处理指示信息和/或第四处理指示信息。
上述第三处理指示信息用于指示网络设备进行滤波处理的参数，以便终端设备根据第三处理指示信息可以进行逆滤波处理。第三处理指示信息与第二处理指示信息类似，均是指示滤波处理的参数，不同之处在于，第二处理指示信息指示终端设备对于上行传输如何进行滤波处理，第三处理指示信息用于指示网络设备对于下行传输已进行或将进行滤波处理的参数。第三处理指示信息存在以下几种方式：
方式一，第三处理指示信息包括第三带宽指示信息、第四带宽指示信息或第三带宽与第四带宽之间的比值中的一种或多种。第三带宽指示信息用于指示第三带宽，第四带宽指示信息用于指示第四带宽和/或第四带宽的中心频点。
其中，第三带宽为原始数据带宽，即调制和相位旋转后的数据占用的带宽，也即第三数据流对应的带宽。第四带宽为输出数据占用的带宽，即第二传输数据流占用的带宽，也即第二数据流对应的带宽，也即网络设备为终端设备接收第二传输数据流配置的带宽。
方式二，第三处理指示信息用于指示第二滤波参数，第二滤波参数包括第二滚降因子。可选的，第二滤波参数或第二指示信息还包括滤波器类型，滤波器类型指示滤波器的函数类型，以便终端设备选择相应的滤波器函数进行逆滤波处理。
方式三，第三处理指示信息用于指示频域信号的共轭对称点位置，例如用于指示频域信号的共轭对称点的位置索引。终端设备根据共轭对称点的位置，进行接收处理。方式三中的共轭对称点的位置索引可参见图12a所示。
方式四，第三处理指示信息用于指示冗余数据的长度，终端设备可以根据冗余数据的长度，确定需要恢复的频域数据长度，进行接收解调。方式四中的冗余数据的长度可参见图12a所示。
上述第四处理指示信息用于指示网络设备对第二比特流进行调制的第二调制方式，以便终端设备根据第二调制方式进行解调。第二调制方式与第一调制方式可以相同，例如均为4-PAM；也可以不相同，例如第一调制方式为4-PAM，第二调制方式为BPSK。第四处理指示信息与第一处理指示信息类似，不同之处在于，第一处理指示信息用于指示终端设备采用何种调制方式进行调制，第四处理指示信息用于指示网络设备已采用或将采用的调制方式。第四处理指示信息与第一处理指示信息一样，也存在三种方式，可参见对第一处理指示信息的具体描述。
第二指示信息在包括一种处理指示信息，不包括另一种处理指示信息的情况下，另一种处理指示信息可以是默认的或预定义的。进一步的，第三处理指示信息和第四处理指示信息均可以是默认的或预定义的。该种情况下，无需执行步骤403。
在网络设备执行步骤403的情况下，步骤403可以入图12所示在步骤402之后执行，也可以在步骤401之前执行。
可选的，第二指示信息还包括第二传输资源指示信息，第二传输资源指示信息用于指 示第二时频资源，第二时频资源为网络设备发送第二传输数据流占用的时频资源，便于终端设备在第二时频资源上从网络设备接收第二传输数据流。
在一种可能的实现方式中，步骤403可包括：403a，网络设备向终端设备发送第三处理指示信息；403b，网络设备向终端设备发送第四处理指示信息；403c，网络设备向终端设备发送第二传输资源指示信息中的一种或多种。若包括403a和403b，第三处理指示信息和第四处理指示信息可携带在同一消息中，也可携带在不同消息中。若包括403a、403b和403c，第二传输资源指示信息与第三处理指示信息可以携带在同一消息中，也可携带在不同消息中；第二传输资源指示信息与第四处理指示信息可以携带在同一消息中，也可携带在不同消息中；第二传输资源指示信息与第三处理指示信息和第四处理指示信息可以携带在同一消息中，例如第二指示信息包括第二传输资源指示信息、第三处理指示信息和第四处理指示信息，也可携带在三条不同消息中。
步骤404，终端设备根据第二指示信息对第二传输数据流进行处理，得到第二比特流。
在网络设备执行步骤403的情况下，终端设备根据第二指示信息对第二传输数据流进行处理，得到第二比特流。步骤404与图10所示的流程类似，不同之处在于，步骤404中根据第二指示信息进行处理。
终端设备在接收到第二传输数据流时，对第二传输数据流依次进行去循环前缀和DFT处理，得到第三数据流，第三数据流为频域数据。
终端设备根据第三处理指示信息对第三数据流进行逆滤波处理，得到第四数据流。若第三处理指示信息用于指示第二滤波参数，第二滤波参数包括第二滚降因子，那么终端设备根据第二滚降因子对第三数据流进行复制、取共轭、移位等操作，使得第四带宽大于第三带宽。若第三处理指示信息包括第三带宽指示信息和第四带宽指示信息，那么终端设备根据第三带宽和第四带宽对第三数据流进行复制、取共轭、移动等操作，使得第四数据流对应的带宽为第四带宽。
终端设备根据第四处理指示信息对第四数据流进行去相位旋转和解调，得到第二比特流。去相位旋转因子可以是乘以相位旋转因子e k×j×ω，也可以是除以相位旋转因子e k×j×ω。解调时采用第二调制方式进行解调。
在网络设备执行步骤403的情况下，终端设备根据默认的或预定义的滤波参数进行逆滤波处理，根据默认的或预定义的调制方式进行解调，以得到第二比特流。
在图12所示的实施例中，网络设备将其对第二比特流处理的参数告知终端设备，以便终端设备根据这些参数进行逆处理，以得到第二比特流。网络设备在对第二比特流处理的过程中，可以实现频域截断，从而降低第二传输数据流的PAPR。
图11和图12所示的实施例中，默认终端设备在发送数据时进行频域截断，网络设备在发送数据时进行频域截断。可选的，网络设备可以指示进行频域截断还是频域扩展。
对于图11所示的上行传输，网络设备可指示终端设备对待发送比特流进行频域截断还是频域扩展。该指示可以通过第二处理指示信息隐式指示，例如，通过第一滚降因子隐式指示，第一滚降因子为正数时，指示频域扩展；为负数时，指示频域截断。再例如，通过第一带宽与第二带宽的大小，可隐式指示频域截断或频域扩展。该指示也可以通过额外的指示信息进行指示，例如通过额外的1比特进行指示，该比特为1时，指示频域扩展；为 0时，指示频域截断。这样便于网络设备在接收第一传输数据流时进行相应的恢复。
对于图12所示的下行传输，网络设备可告知终端设备，网络设备对待发送比特流进行的是频域截断还是频域扩展。可通过第三处理指示隐式指示，也可以通过额外的指示信息进行指示。这样便于终端设备在接收到第二传输数据流时进行相应的恢复。
为了提高导频信号的信噪比(signal-noise ratio，SNR)，提高测量估计精度，需要对导频信号进行功率扩展(power boosting)。导频信号可以是相位跟踪参考信号(phase tracking reference signal，PT-RS)或其他导频参考信号。本申请实施例导频信号以PT-RS为例。
示例性的，可参见图13所示的功率扩展示例星座图，该星座图以16-QAM的星座图为例。PT-RS星座点在功率扩展前位于坐标原点附近的四个星座点，功率扩展后位于虚线方块，即通过功率扩展将PT-RS星座点从16-QAM星座图的内围扩展到最外围。
为了降低导频信号的PAPR，发送端对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；对第一数据流进行功率扩展和相位旋转，得到第二数据流，第二数据流包括的部分第二数据为复数；对第二数据流进行处理，得到传输数据流，并发送传输数据流。其中，待发送比特流为导频信号的比特流，例如为PT-RS的比特流。这样既可以提高导频信号的信噪比，提高测量估计精度，还可以降低导频信号的PAPR。
发送端对待发送比特流进行调制，调制方式可以是BPSK、2-PAM或4-PAM。不管数据采用几阶的调制方式，例如不管对第一比特流或第二比特流采用几阶的调制方式，导频信号总是按照BPSK、2-PAM或4-PAM的调制方式进行调制。具体采用BPSK、2-PAM或4-PAM中的哪一种，可以是预定义的，也可以与调制符号承载的比特数有关，即与导频序列的长度有关。例如，导频序列的长度为2，那么采用4-PAM进行调制。
发送端对第一数据流进行功率扩展和相位旋转，可以是先进行功率扩展再进行相位旋转，或先进行相位旋转再进行功率扩展。示例性的，假设待发送比特流调制后为{-1，+1，-1，+1}，先对{-1，+1，-1，+1}进行功率扩展，扩展倍数为A，得到{-A，+A，-A，+A}；再对{-A，+A，-A，+A}进行π/2的相位旋转，若从0开始编号则得到{-A，+Aj，+A，-Aj}，若从1开始编号则得到{-Aj，-A，+Aj，+A}。先对{-1，+1，-1，+1}进行π/2的相位旋转，若从0开始编号则得到{-1，+j，+1，-j}，若从1开始编号则得到{-j，-1，+j，+1}；再进行功率扩展，扩展倍数为A，得到{-A，+Aj，+A，-Aj}或{-Aj，-A，+Aj，+A}。其中，功率扩展的扩展倍数可以是预定义的，也可以是网络设备为终端设备配置的。
发送端对第二数据流进行处理，该处理可以是频域-时域处理，例如对第二数据流依次进行DFT、IFFT、添加循环前缀等处理。DFT与IFFT之间可以包括FDSS，该FDSS可以是频域截断，也可以是频域扩展。具体如何对第二数据流进行处理在本申请实施例中不作限定。
相应于上述方法实施例给出的方法，本申请实施例还提供了相应的装置，所述装置包括用于执行上述实施例相应的模块。所述模块可以是软件，也可以是硬件，或者是软件和硬件结合。
图14给出了一种装置的结构示意图。所述装置500可以是网络设备，也可以是终端设备，也可以是支持网络设备实现上述方法的芯片、芯片系统、或处理器等，还可以是支持 终端设备实现上述方法的芯片、芯片系统、或处理器等。该装置可用于实现上述方法实施例中描述的方法，具体可以参见上述方法实施例中的说明。
所述装置500可以包括一个或多个处理器501，所述处理器501也可以称为处理单元，可以实现一定的控制功能。所述处理器501可以是通用处理器或者专用处理器等。例如可以是基带处理器或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、基带芯片，终端、终端芯片，DU或CU等)进行控制，执行软件程序，处理软件程序的数据。
在一种可选的设计中，处理器501也可以存有指令和/或数据503，所述指令和/或数据503可以被所述处理器运行，使得所述装置500执行上述方法实施例中描述的方法。
在另一种可选的设计中，处理器501中可以包括用于实现接收和发送功能的收发单元。例如该收发单元可以是收发电路，或者是接口，或者是接口电路。用于实现接收和发送功能的收发电路、接口或接口电路可以是分开的，也可以集成在一起。上述收发电路、接口或接口电路可以用于代码/数据的读写，或者，上述收发电路、接口或接口电路可以用于信号的传输或传递。
在又一种可能的设计中，装置500可以包括电路，所述电路可以实现前述方法实施例中发送或接收或者通信的功能。
可选的，所述装置500中可以包括一个或多个存储器502，其上可以存有指令504，所述指令可在所述处理器上被运行，使得所述装置500执行上述方法实施例中描述的方法。可选的，所述存储器中还可以存储有数据。可选的，处理器中也可以存储指令和/或数据。所述处理器和存储器可以单独设置，也可以集成在一起。例如，上述方法实施例中所描述的对应关系可以存储在存储器中，或者存储在处理器中。
可选的，所述装置500还可以包括收发器505和/或天线506。所述处理器501可以称为处理单元，对所述装置500进行控制。所述收发器505可以称为收发单元、收发机、收发电路或者收发器等，用于实现收发功能。
在一种可能的设计中，所述装置500为终端设备：处理器501用于执行图5中的步骤101-步骤103；执行图10中的步骤202-步骤204；执行图11中的步骤302；执行图12中的步骤404。收发器505用于执行图5中的步骤104；执行图10中的步骤201；执行步骤11中的步骤301和步骤303；执行图12中的步骤402和步骤403。
在一种可能的设计中，所述装置500为网络设备：处理器501用于执行图5中的步骤101-步骤103；执行图10中的步骤202-步骤204；执行图11中的步骤304；执行图12中的步骤401。收发器505用于执行图5中的步骤104；执行图10中的步骤201；执行步骤11中的步骤301和步骤303；执行图12中的步骤402和步骤403。
本申请中描述的处理器和收发器可实现在集成电路(integrated circuit，IC)、模拟IC、射频集成电路RFIC、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)、印刷电路板(printed circuit board，PCB)、电子设备等上。该处理器和收发器也可以用各种IC工艺技术来制造，例如互补金属氧化物半导体(complementary metal oxide semiconductor，CMOS)、N型金属氧化物半导体(nMetal-oxide-semiconductor，NMOS)、P型金属氧化物半导体(positive channel metal oxide semiconductor，PMOS)、双极结型晶体 管(Bipolar Junction Transistor，BJT)、双极CMOS(BiCMOS)、硅锗(SiGe)、砷化镓(GaAs)等。
以上实施例描述中的装置可以是网络设备或者终端设备,但本申请中描述的装置的范围并不限于此,而且装置的结构可以不受图14的限制。装置可以是独立的设备或者可以是较大设备的一部分。例如所述装置可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或子系统；
(2)具有一个或多个IC的集合，可选的，该IC集合也可以包括用于存储数据和/或指令的存储部件；
(3)ASIC，例如调制解调器(MSM)；
(4)可嵌入在其他设备内的模块；
(5)接收机、终端、智能终端、蜂窝电话、无线设备、手持机、移动单元、车载设备、网络设备、云设备、人工智能设备等等；
(6)其他等等。
图15提供了一种终端设备的结构示意图。为了便于说明，图15仅示出了终端设备的主要部件。如图15所示，终端设备600包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端进行控制，执行软件程序，处理软件程序的数据。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解析并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行处理后得到射频信号并将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，该射频信号被进一步转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
为了便于说明，图15仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本发明实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图15中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中， 由处理器执行软件程序以实现基带处理功能。
在一个例子中，可以将具有收发功能的天线和控制电路视为终端设备600的收发单元611，将具有处理功能的处理器视为终端设备600的处理单元612。如图15所示，终端设备600包括收发单元611和处理单元612。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元611中用于实现接收功能的器件视为接收单元，将收发单元611中用于实现发送功能的器件视为发送单元，即收发单元611包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。可选的，上述接收单元和发送单元可以是集成在一起的一个单元，也可以是各自独立的多个单元。上述接收单元和发送单元可以在一个地理位置，也可以分散在多个地理位置。
如图16所示，本申请实施例提供了另一种装置700。该装置可以是终端设备,也可以是终端设备的部件(例如，集成电路，芯片等等)。该装置还可以是网络设备，也可以是网络设备的部件(例如，集成电路，芯片等等)。该装置也可以是其他通信模块,用于实现本申请方法实施例中的方法。该装置700可以包括:处理模块702(处理单元)。可选的，还可以包括收发模块701(收发单元)和存储模块703(存储单元)。
在一种可能的设计中，如图16中的一个或者多个模块可能由一个或者多个处理器来实现，或者由一个或者多个处理器和存储器来实现；或者由一个或多个处理器和收发器实现；或者由一个或者多个处理器、存储器和收发器实现，本申请实施例对此不作限定。所述处理器、存储器、收发器可以单独设置，也可以集成。
所述装置具备实现本申请实施例描述的终端设备的功能，比如，所述装置包括终端设备执行本申请实施例描述的终端设备涉及步骤所对应的模块或单元或手段(means)，所述功能或单元或手段(means)可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现，还可以通过软件和硬件结合的方式实现。详细可进一步参考前述对应方法实施例中的相应描述。
或者所述装置具备实现本申请实施例描述的网络设备的功能，比如，所述装置包括所述网络设备执行本申请实施例描述的网络设备涉及步骤所对应的模块或单元或手段(means)，所述功能或单元或手段(means)可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现，还可以通过软件和硬件结合的方式实现。详细可进一步参考前述对应方法实施例中的相应描述。
可选的，本申请实施例中的装置700中各个模块可以用于执行本申请实施例中图5、图10、图11或图12描述的方法。
对于装置700为终端设备的情况：
在一种可能的实现方式中，处理模块702，用于对第一比特流进行调制和相位旋转，得到第一数据流，第一数据流包括多个第一数据，每个第一数据承载n个第一比特，n为大于1的正整数；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；对第二数据流进行处理，得到第一传输数据流；收发模块701，用于发送第一传输数据流。
收发模块701，还用于接收第一指示信息，第一指示信息包括第一处理指示信息；处 理模块，具体用于根据第一处理指示信息对第一比特流进行调制和相位旋转。
在一种可能的实现方式中，收发模块701，用于接收第二传输数据流；处理模块702，用于对所述第二传输数据流进行处理，得到第三数据流；对所述第三数据流进行逆滤波处理，得到第四数据流，所述第三数据流的带宽为第三带宽，所述第四数据流的带宽为第四带宽，所述第三带宽小于所述第四带宽；对所述第四数据流进行去相位旋转和解调，得到第二比特流。
收发模块701，还用于接收第二指示信息，第二指示信息包括第三处理指示信息；处理模块，具体用于根据第三处理指示信息对第三数据流进行逆滤波处理。
在一种可能的实现方式中，处理模块702，用于对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；对第一数据流进行功率扩展和相位旋转，得到第二数据流，第二数据流包括的部分第二数据为复数；对第二数据流进行处理，得到传输数据流；收发模块701，用于发送传输数据流。
对于装置700为网络设备的情况：
在一种可能的实现方式中，处理模块702，用于对第一比特流进行调制和相位旋转，得到第一数据流，第一数据流包括多个第一数据，每个第一数据承载n个第一比特，n为大于1的正整数；对第一数据流进行滤波处理，得到第二数据流，第一数据流对应的带宽为第一带宽，第二数据流对应的带宽为第二带宽，第二带宽小于第一带宽；对第二数据流进行处理，得到第一传输数据流；收发模块701，用于发送第一传输数据流。
在一种可能的实现方式中，收发模块701，用于接收第二传输数据流；处理模块702，用于对所述第二传输数据流进行处理，得到第三数据流；对所述第三数据流进行逆滤波处理，得到第四数据流，所述第三数据流的带宽为第三带宽，所述第四数据流的带宽为第四带宽，所述第三带宽小于所述第四带宽；对所述第四数据流进行去相位旋转和解调，得到第二比特流。
在一种可能的实现方式中，处理模块702，用于对待发送比特流进行调制，得到第一数据流，第一数据流包括多个第一数据，第一数据为实数；对第一数据流进行功率扩展和相位旋转，得到第二数据流，第二数据流包括的部分第二数据为复数；对第二数据流进行处理，得到传输数据流；收发模块701，用于发送传输数据流。
本领域技术人员还可以了解到本申请实施例列出的各种说明性逻辑块(illustrative logical block)和步骤(step)可以通过电子硬件、电脑软件，或两者的结合进行实现。这样的功能是通过硬件还是软件来实现取决于特定的应用和整个系统的设计要求。本领域技术人员可以对于每种特定的应用，可以使用各种方法实现所述的功能，但这种实现不应被理解为超出本申请实施例保护的范围。
本申请所描述的技术可通过各种方式来实现。例如，这些技术可以用硬件、软件或者硬件结合的方式来实现。对于硬件实现，用于在通信装置(例如，基站，终端、网络实体、或芯片)处执行这些技术的处理单元，可以实现在一个或多个通用处理器、数字信号处理器(digital signal processor，DSP)、数字信号处理器件、专用集成电路(application specific integrated circuit，ASIC)、可编程逻辑器件、现场可编程门阵列(field programmable gate array，FPGA)、或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合 中。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类似的配置来实现。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。
本申请中各表所示的对应关系可以被配置，也可以是预定义的。各表中的信息的取值仅仅是举例，可以配置为其他值，本申请并不限定。在配置信息与各参数的对应关系时，并不一定要求必须配置各表中示意出的所有对应关系。例如，本申请中的表格中，某些行 示出的对应关系也可以不配置。又例如，可以基于上述表格做适当的变形调整，例如，拆分，合并等等。上述各表中标题示出参数的名称也可以采用通信装置可理解的其他名称，其参数的取值或表示方式也可以通信装置可理解的其他取值或表示方式。上述各表在实现时，也可以采用其他的数据结构，例如可以采用数组、队列、容器、栈、线性表、指针、链表、树、图、结构体、类、堆、散列表或哈希表等。
本申请中的预定义可以理解为定义、预先定义、存储、预存储、预协商、预配置、固化、或预烧制。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (18)

  1. 一种数据传输方法，其特征在于，包括：
    对比特流进行调制和相位旋转，得到第一数据流；
    对所述第一数据流进行滤波处理，得到第二数据流，所述第一数据流对应的带宽为第一带宽，所述第二数据流对应的带宽为第二带宽，所述第二带宽小于所述第一带宽；
    对所述第二数据流进行处理，得到传输数据流，并发送所述传输数据流。
  2. 根据权利要求1所述的方法，其特征在于，所述第一数据流包括多个第一数据，每个第一数据承载n个比特，n为大于1的正整数。
  3. 根据权利要求1所述的方法，其特征在于，
    所述对比特流进行调制和相位旋转，得到第一数据流，包括：
    采用调制方式对比特流进行调制，得到调制数据流，所述调制数据流包括多个调制数据，所述调制数据为实数；
    对所述调制数据流进行相位旋转，得到第一数据流，所述第一数据流包括的部分第一数据为复数。
  4. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    接收第一处理指示信息，所述第一处理指示信息用于指示对所述比特流进行调制的调制方式。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述方法还包括：
    接收第二处理指示信息，所述第二处理指示信息用于指示对所述第一数据流进行滤波处理的参数。
  6. 根据权利要求5所述的方法，其特征在于，所述第二处理指示信息包括第一带宽指示信息、第二带宽指示信息或所述第一带宽与所述第二带宽之间的比值中的一种或多种；
    其中，所述第一带宽指示信息用于指示所述第一带宽，所述第二带宽指示信息用于指示所述第二带宽和/或所述第二带宽的中心频点。
  7. 根据权利要求5所述的方法，其特征在于，所述第二处理指示信息用于指示滤波参数，所述滤波参数包括滚降因子。
  8. 根据权利要求1-4任一项所述的方法，其特征在于，所述方法还包括：
    接收传输资源指示信息，所述传输资源指示信息用于指示时频资源；
    所述发送所述传输数据流，包括：
    在所述时频资源上发送所述传输数据流。
  9. 一种数据传输方法，其特征在于，包括：
    接收传输数据流，对所述传输数据流进行处理，得到第三数据流；
    对所述第三数据流进行逆滤波处理，得到第四数据流，所述第三数据流的带宽为第三带宽，所述第四数据流的带宽为第四带宽，所述第三带宽小于所述第四带宽；
    对所述第四数据流进行去相位旋转和解调，得到比特流。
  10. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    接收第三处理指示信息，所述第三处理指示信息用于指示对所述第三数据流进行逆滤 波处理的参数。
  11. 根据权利要求10所述的方法，其特征在于，所述第三处理指示信息包括第三带宽指示信息、第四带宽指示信息或所述第三带宽与所述第四带宽之间的比值中的一种或多种；
    其中，所述第四带宽指示信息用于指示所述第四带宽，所述第三带宽指示信息用于指示所述第三带宽和/或所述第三带宽的中心频点。
  12. 根据权利要求10所述的方法，其特征在于，所述第三处理指示信息用于指示滤波参数，所述滤波参数包括滚降因子。
  13. 根据权利要求9或10所述的方法，其特征在于，所述方法还包括：
    接收第四处理指示信息，所述第四处理指示信息用于指示对所述第四数据流进行解调的调制方式。
  14. 根据权利要求9或10所述的方法，其特征在于，所述方法还包括：
    接收传输资源指示信息，所述传输资源指示信息用于指示时频资源；
    所述接收所述传输数据流，包括：
    在所述时频资源上接收所述传输数据流。
  15. 一种数据传输装置，其特征在于，所述装置包括处理器、收发器和存储器，当所述处理器执行所述存储器中的计算机程序或指令时，使得所述数据传输装置执行权利要求1-8中任一项所述的方法。
  16. 一种数据传输装置，其特征在于，所述装置包括处理器、收发器和存储器，当所述处理器执行所述存储器中的计算机程序或指令时，使得所述数据传输装置执行权利要求9-14中任一项所述的方法。
  17. 一种芯片，其特征在于，包括处理器和接口；所述处理器用于从存储器中调用并运行所述存储器中存储的计算机程序，使得如权利要求1-8或9-14中任一项所述的方法被执行。
  18. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括指令，当所述指令在计算机上运行时，使得计算机执行如权利要求1-8或9-14任一项所述的方法。
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