Signal sending method and communication apparatus

Abstract

A signal sending method and a communication apparatus. The method comprises: on the basis of a first modulation mode, modulating signals to be modulated, so as to obtain first modulated signals, the first modulation mode comprising amplitude modulation of the signals to be modulated; on the basis of a second modulation mode, modulating the plurality of first modulated signals, so as to obtain m second modulated signals, the second modulation mode comprising phase modulation, and the second modulated signals being complex signals; and sending the second modulated signals. The method and the communication apparatus provided by the embodiments of the present application enable bit information to be carried on modulated signals, so as to achieve information transmission, and also expand the selection of signal modulation modes, so as to allow devices to, on the basis of actual communication situations, choose to use flexible modulation modes for signal modulation, thus improving communication performance.

Description

Method and communication apparatus for signal transmission

[0001] This application claims priority from the Chinese Patent Application No. 202410473260.4 filed on April 18, 2024, and entitled "Method and communication apparatus for signal transmission", the content of which is incorporated herein in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communications, and more particularly, to a method and communication apparatus for signal transmission. BACKGROUND

[0003] In a communication system, information to be transmitted is often represented by bits "0" or "1", while a wireless signal is observed in time domain as a sinusoidal wave with varying amplitude, which is not constant. Before a device transmits a signal to another device or after receiving a signal transmitted by another device, the signal needs to be modulated or demodulated, so that the bit information to be transmitted can be carried on the radio signal or can be parsed from the radio signal.

[0004] Therefore, how to carry bits on an analog signal with amplitude and phase through signal transmission is an urgent problem to be solved. SUMMARY

[0005] Embodiments of the present application provide a method for signal transmission, which can carry bits on an analog signal with amplitude and phase.

[0006] In a first aspect, a method for signal transmission is provided. The method can be executed by a terminal device, or by a communication module configured in the terminal device, or by a circuit or chip or chip system responsible for communication function in the terminal (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip containing a modem core, a processor, or a system in package (SIP) chip), or by a logic module or software that can realize all or part of the functions of the terminal device. The method can also be executed by a network device, or by a component (such as a chip or circuit or chip system) configured in the network device. Embodiments of the present application do not limit this. Here, the method is taken as an example applied to a terminal device / network device.

[0007] The method comprises: modulating a to-be-modulated signal according to a first modulation mode to obtain a first modulated signal, the first modulation mode comprising modulating the amplitude of the to-be-modulated signal; modulating a plurality of first modulated signals according to a second modulation mode to obtain m second modulated signals, wherein the second modulation mode comprises phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulated signals satisfy: the phase difference Q of any two adjacent second modulated signals in the time domain satisfies: Q=n*π / 2, or Q=-n*π / 2, n is an integer greater than or equal to 1; and transmitting the second modulated signal.

[0008] Based on the scheme provided in the embodiments of the present application, by amplitude modulation and phase modulation of the to-be-modulated signal, on the one hand, the bit information can be carried on the modulated signal to realize information transmission; on the other hand, the selection of the signal modulation mode is enriched, so that the device can select a flexible modulation mode according to the actual communication situation to modulate the signal, thereby improving the communication performance.

[0009] In some possible implementation manners, the transmitting the second modulated signal comprises: any two adjacent second modulated signals in the time domain have a time interval.

[0010] In some possible implementation manners, the time interval is greater than or equal to T / 2, and T is a transmission period of the second modulated signal in the time domain.

[0011] Based on the scheme provided in the embodiments of the present application, by transmitting the time interval of any two adjacent second modulation symbols in the time domain, and superimposing the non-peak of the waveform of one of the second modulated signals in the time domain and the peak of the waveform of the other second modulated signal, the peak to average power ratio (PAPR) can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

[0012] In some possible implementation manners, the modulating the plurality of first modulated signals according to the second modulation mode to obtain the m second modulated signals further comprises: modulating the amplitude of the first modulated signal according to a first coefficient A, wherein the first coefficient A is related to at least one of the following: a roll-off factor α or a spectrum spreading factor β.

[0013] Based on the scheme provided in the embodiments of the present application, on the one hand, by expanding the number of subcarriers of the transmitted modulation signal, the PAPR of signal transmission can be reduced, and the link quality can be improved, or by compressing the number of subcarriers of the transmitted modulation signal, the occupation of frequency resources can be reduced, and the spectral efficiency can be improved; on the other hand, by amplitude modulating the signal according to the spectrum expansion / compression, the amplitude of the modulation signal can be made to be more matched to the bandwidth of the transmission of the modulation signal, and the error code performance of signal transmission can be improved, so that the communication performance can be improved.

[0014] In some possible implementation manners, the first coefficient A satisfies: A = a + 1, or A = 1 / (1-β), or A = 1 / (a + 1), or A = 1-β.

[0015] In some possible implementation manners, the sending of the second modulation signal comprises: sending the second modulation signal and a pilot symbol, the second modulation signal and the pilot symbol being located in the same time unit, the pilot symbol comprising a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol being the same as the bandwidth for sending the second modulation signal.

[0016] For example, the sending of the second modulation signal comprises: sending the second modulation signal and a pilot symbol in the same time unit (for example, the same radio frame), the pilot symbol comprising a frequency domain pilot signal, for example, a Zadoff-Chu sequence (also referred to as a ZC sequence), or an m sequence of a quadrature phase shift keying (QPSK) signal, etc. The second modulation signal comprises the single carrier signal that has been subjected to bandwidth expansion / compression, and the pilot symbol comprises a signal that has not been subjected to the bandwidth expansion / compression (that is, the pilot symbol represents a signal that is directly mapped to the bandwidth after bandwidth expansion / compression, without needing to undergo the operations of discrete fourier transform (DFT) and bandwidth expansion / compression as the second modulation signal, and the bandwidth after the expansion / compression is used to transmit the second modulation signal and the pilot symbol).

[0017] In some possible implementation manners, the frequency domain sequence comprises a constant modulus sequence.

[0018] For example, the frequency domain sequence comprises a ZC sequence or an m sequence.

[0019] Based on the scheme provided in the embodiments of the present application, by amplitude modulating the signal by the first coefficient A, the energy of the second modulation signal obtained by modulation can be made to be more consistent with the energy of the pilot symbol, the performance of correct demodulation of the signal can be improved, and thus the communication performance can be improved.

[0020] In some possible implementation manners, the phase modulation at least comprises any one of the following: modulating the first modulation signal according to a common phase rotation; or, modulating the first modulation signal according to a rotated phase value.

[0021] In some possible implementation manners, the second modulation signal satisfies the following condition:

[0022] wherein i represents an index of the second modulation signal, d(i) represents the second modulation signal, C represents a normalization coefficient, f(i) represents the rotated phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotated phase value.

[0023] In some possible implementation manners, a value B of the PAM_signal represents an energy level corresponding to the first modulation signal, and B satisfies any one of the following: B∈{1; -1; 3; -3;...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

[0024] In some possible implementation manners, the Com_Phase_Rot satisfies: Com_Phase_Rot = e jθ , θ = aπ / 4, where a is a number greater than or equal to 0.

[0025] In some possible implementation manners, the f(i) satisfies any one of the following: f(i) = ni, or, f(i) = -ni, or, f(i) = n(i mod 4y+2), or, f(i) = -n(i mod 4y+2), or, f(i) = n(i mod 4y), or, f(i) = -n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a remainder function.

[0026] The second modulation manner further comprises modulating an amplitude of the first modulation signal according to a normalization coefficient C, and the normalization coefficient C satisfies any one of the following: , or, .

[0027] In some possible implementation manners, b(i') represents a to-be-modulated signal corresponding to the first modulation signal, and i' represents an index of the to-be-modulated signal.

[0028] When i' satisfies: i' = i, the second modulation signal satisfies the following condition: , or, , or,

[0029] When i' satisfies any one of the following: i' = 2i, or, i' = 2i + 1, the second modulation signal satisfies the following condition: Or, Or, Or, Or,

[0030] When i' satisfies any one of the following: i' = 3i, or, i' = 3i + 1, or, i' = 3i + 2, the second modulation signal satisfies the following condition: Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Or,

[0031] Based on the scheme provided in the embodiments of the present application, the modulated signal can carry 2 or more than 2 bits, and the modulated signal carrying more than 2 bits can improve the spectral efficiency.

[0032] In some possible implementation manners, b(i') represents a to-be-modulated signal corresponding to the first modulation signal, and i' represents an index of the to-be-modulated signal;

[0033] When i' satisfies: i' = i, the second modulation signal satisfies the following condition: Or, Or,

[0034] When i' satisfies any one of the following: i' = 2i, or, i' = 2i + 1, the second modulation signal satisfies the following condition: Or, Or, Or, Or,

[0035] When i' satisfies any one of the following: i' = 3i, or, i' = 3i + 1, or, i' = 3i + 2, the second modulation signal satisfies the following condition: Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Or,

[0036] Based on the scheme provided in the embodiments of the present application, the modulated signal can carry 2 or more than 2 bits, and the modulated signal carrying more than 2 bits can improve the spectral efficiency.

[0037] In a second aspect, a method for signal transmission is provided. The method can be executed by a terminal device, or a communication module configured in the terminal device, or a circuit or chip or chip system responsible for communication function in the terminal (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip containing a modem core, a processor, or a system in package (SIP) chip), or a logic module or software that can implement all or part of the terminal device function. The method can also be executed by a network device, or a component (such as a chip or circuit or chip system) configured in the network device. The embodiments of the present application do not limit this. Here, the method is taken as an example applied to a terminal device / network device.

[0038] The method comprises: modulating a to-be-modulated signal according to a first modulation mode to obtain a first modulated signal, the first modulation mode comprising modulating the phase of the to-be-modulated signal; modulating the first modulated signal according to a second modulation mode to obtain a second modulated signal, the second modulation mode comprising modulating the amplitude of the first modulated signal according to a first coefficient A, the first coefficient A being related to at least one of the following: a roll-off factor α or a spectrum spreading factor β; and transmitting the second modulated signal.

[0039] Based on the scheme provided in the embodiments of the present application, on the one hand, by expanding the number of subcarriers of the modulated signal to be transmitted, the PAPR of signal transmission can be reduced, and the link quality can be improved, or by compressing the number of subcarriers of the modulated signal to be transmitted, the occupation of frequency resources can be reduced, and the spectral efficiency can be improved; on the other hand, by modulating the amplitude of the signal according to the spectrum expansion / compression, the amplitude of the modulated signal can be more matched with the bandwidth of transmitting the modulated signal, and the error code performance of signal transmission can be improved, so that the communication performance can be improved.

[0040] In some possible implementation manners, the second modulated signal comprises a real part signal and an imaginary part signal, the transmitting the second modulated signal comprises transmitting the real part signal and the imaginary part signal, and the real part signal and the imaginary part signal have a time interval.

[0041] In some possible implementation manners, the time interval is greater than or equal to T / 2, and T is a transmission period of the second modulated signal in the time domain.

[0042] Based on the scheme provided in the embodiments of the present application, by transmitting the real part and the imaginary part of the modulation signal with a time interval, and superimposing the non-peak of the waveform of the imaginary signal on the peak of the waveform of the real signal, the PAPR can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

[0043] In some possible implementation ways, the first coefficient A satisfies: A = a + 1, or A = 1 / (1-β), or A = 1 / (a + 1), or A = 1-β.

[0044] In some possible implementation ways, the sending the second modulation signal comprises: sending the second modulation signal and a pilot symbol, the second modulation signal and the pilot symbol are located in the same time unit, the pilot symbol comprises a frequency domain sequence which is not processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulation signal.

[0045] For example, the sending the second modulation signal comprises: sending the second modulation signal and a pilot symbol in the same time unit (for example, the same radio frame), the pilot symbol comprises a frequency domain pilot signal, for example, a Zadoff-Chu sequence (also referred to as a ZC sequence), or an m sequence when the modulation signal is a QPSK signal, etc. The second modulation signal comprises the single carrier signal which is processed by the bandwidth expansion / compression, and the pilot symbol comprises a signal which is not processed by the bandwidth expansion / compression (that is, the pilot symbol is directly mapped to the bandwidth after the bandwidth expansion / compression, without being subjected to the DFT and the bandwidth expansion / compression operation as the second modulation signal, and the bandwidth after the expansion / compression is used to transmit the second modulation signal and the pilot symbol).

[0046] In some possible implementation ways, the frequency domain sequence comprises a constant modulus sequence.

[0047] For example, the frequency domain sequence comprises a ZC sequence or an m sequence.

[0048] Based on the scheme provided in the embodiments of the present application, the signal is amplitude-modulated by the first coefficient A, so that the energy of the second modulation signal obtained by the modulation is more consistent with the energy of the pilot symbol, the performance of correct demodulation of the signal is improved, and thus the communication performance can be improved.

[0049] In some possible implementation ways, the second modulation signal satisfies the following condition:

[0050] wherein i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents a normalization coefficient, f(i) represents a rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents a common rotation phase value.

[0051] In some possible implementation manners, the value B of the PAM signal represents an energy level corresponding to the first modulation signal, and B satisfies any one of the following: B e {1; -1; 3; -3;...; (2x-1); -(2x-1)}, x is an integer greater than or equal to 1.

[0052] In some possible implementation manners, the Com Phase Rot satisfies: Com Phase Rot = e jθ , θ = aπ / 4, a is a number greater than or equal to 0.

[0053] In some possible implementation manners, f(i) satisfies: f(i) = 0; or,

[0054] f(i) = n(i mod 4y+2), or, f(i) = -n(i mod 4y+2), or, f(i) = n(i mod 4y), or,

[0055] f(i) = -n(i mod 4y), y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents a remainder function;

[0056] The second modulation manner further includes modulating the amplitude of the first modulation signal according to a normalization coefficient C, and the normalization coefficient C satisfies any one of the following:

[0057] In some possible implementation manners, b(i') represents a to-be-modulated signal corresponding to the first modulation signal, and i' represents an index of the to-be-modulated signal;

[0058] When i' satisfies any one of the following: i' = 2i, or, i' = 2i+1, the second modulation signal satisfies the following condition: Or, Or,

[0059] When i' satisfies any one of the following: i' = 4i, or, i' = 4i+1, or, i' = 4i+2, or, i' = 4i+3, the second modulation signal satisfies the following condition: Or, Or, Or, Or, Or, Or, Or, Or,

[0060] ​When i' satisfies any one of the following: i' = 6i, or, i' = 6i + 1, or, i' = 6i + 2, or, i' = 6i + 3, or, i' = 6i + 4, or, i' = 6i + 5, the second modulation signal satisfies the following condition: or, or, or, or, or, or, or, or, or, or, or,

[0061] Based on the scheme provided in the embodiments of the present application, the modulated signal can carry more than 2 bits, which can improve the spectral efficiency.

[0062] In some possible implementation manners, b(i') represents a signal to be modulated corresponding to the first modulation signal, and i' represents an index of the signal to be modulated.

[0063] When i' satisfies: i' = i, the second modulation signal satisfies the following condition: or,

[0064] When i' satisfies any one of the following: i' = 2i, or, i' = 2i + 1, the second modulation signal satisfies the following condition: or, or,

[0065] When i' satisfies any one of the following: i' = 3i, or, i' = 3i + 1, or, i' = 3i + 2, the second modulation signal satisfies the following condition: or, or, or, or, or, mod represents a remainder function.

[0066] In a third aspect, a method for signal receiving is provided. The method can be performed by a terminal device, or by a communication module configured in the terminal device, or by a circuit or chip or chip system (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip containing a modem core, a processor, or a system in package (SIP) chip) responsible for communication functions in the terminal, or by a logic module or software that can implement all or part of the functions of the terminal. The method can also be performed by a network device, or by a component (such as a chip or circuit or chip system) configured in the network device. The embodiments of the present application do not limit this. Here, the method is taken as an example applied to a terminal / network device.

[0067] The method comprises: receiving a second modulated signal, and demodulating the second modulated signal according to a first coefficient A.

[0068] Based on the scheme provided in the embodiments of the present application, the modulated signal is demodulated according to the first coefficient, so that the demodulation result of the signal can be more consistent with the to-be-modulated signal before modulation, a more accurate demodulation result is obtained, the signal is better recovered, and the error code performance is improved.

[0069] In a fourth aspect, a communication apparatus is provided. The apparatus comprises: a processing unit configured to modulate a to-be-modulated signal according to a first modulation mode to obtain a first modulated signal, the first modulation mode comprising modulating the amplitude of the to-be-modulated signal; the processing unit is further configured to modulate a plurality of first modulated signals according to a second modulation mode to obtain m second modulated signals, wherein the second modulation mode comprises phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulated signals satisfy: the phase difference Q of any two adjacent second modulated signals in the time domain satisfies: Q=n*π / 2, or Q=-n*π / 2, n is an integer greater than or equal to 1; and a transceiver unit configured to transmit the second modulated signal.

[0070] In some possible implementation manners, the second modulated signal comprises a real part signal and an imaginary part signal, and the transceiver unit is specifically configured to: transmit the second modulated signal by transmitting the real part signal and the imaginary part signal, and the real part signal and the imaginary part signal have a time interval.

[0071] In some possible implementation manners, the time interval is greater than or equal to T / 2, and T is a transmission period of the second modulated signal in the time domain.

[0072] In some possible implementation manners, the processing unit is specifically configured to: modulate the amplitude of the first modulation signal according to a first coefficient A, where the first coefficient A is at least related to any one of the following: a roll-off factor a, or a spectrum spreading factor β.

[0073] In some possible implementation manners, the first coefficient A satisfies: A=α+1, or A=1 / (1-β), or A=1 / (α+1), or A=1-β.

[0074] In some possible implementation manners, the sending of the second modulation signal comprises: sending the second modulation signal and a pilot symbol, the second modulation signal and the pilot symbol being located in a same time unit, the pilot symbol comprising a frequency domain sequence that is not subjected to time domain processing, and a bandwidth for sending the pilot symbol being the same as a bandwidth for sending the second modulation signal.

[0075] For example, the sending of the second modulation signal comprises: sending the second modulation signal and a pilot symbol in a same time unit (for example, a same radio frame), the pilot symbol comprising a frequency domain pilot signal, for example, a Zadoff-Chu sequence (also referred to as a ZC sequence), or an m sequence of a QPSK signal, and the like. The second modulation signal comprises the single carrier signal subjected to the bandwidth expansion / compression described above, and the pilot symbol comprises a signal that is not subjected to the bandwidth expansion / compression described above (that is, the pilot symbol represents a signal that is directly mapped to a bandwidth after bandwidth expansion / compression, without needing to undergo the operations of DFT and bandwidth expansion / compression as the second modulation signal, and the bandwidth after the expansion / compression is used for transmission of the second modulation signal and the pilot symbol).

[0076] In some possible implementation manners, the frequency domain sequence comprises a constant modulus sequence.

[0077] For example, the frequency domain sequence comprises a ZC sequence or an m sequence.

[0078] Based on the scheme provided in the embodiments of the present application, the signal is subjected to amplitude modulation through a first coefficient A, so that the energy of the second modulation signal obtained through modulation is more consistent with the energy of the pilot symbol, the performance of correct demodulation of the signal is improved, and therefore the communication performance can be improved.

[0079] In some possible implementation manners, the processing unit is specifically configured to: modulate the first modulation signal according to a common phase rotation; or modulate the first modulation signal according to a rotation phase value.

[0080] In some possible implementation manners, the second modulation signal satisfies the following condition:

[0081] wherein i represents an index of the second modulation signal, d(i) represents the second modulation signal, C represents a normalization coefficient, f(i) represents a rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents a common rotation phase value.

[0082] In some possible implementation manners, a value of B of the PAM_signal represents an energy level corresponding to the first modulation signal, and B satisfies any one of B∈{1;-1;3;-3;...;(2x-1);-(2x-1)}, where x is an integer greater than or equal to 1.

[0083] In some possible implementation manners, the Com_Phase_Rot satisfies Com_Phase_Rot=e jθ , θ=aπ / 4, and a is a number greater than or equal to 0.

[0084] In some possible implementation manners, the f(i) satisfies any one of f(i)=ni, f(i)=-ni, f(i)=n(i mod 4y+2), f(i)=-n(i mod 4y+2), f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function.

[0085] In some possible implementation manners, the f(i) satisfies any one of f(i)=ni, f(i)=-ni, f(i)=n(i mod 4y+2), f(i)=-n(i mod 4y+2), f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function.

[0086] In some possible implementation manners, the f(i) satisfies any one of f(i)=ni, f(i)=-ni, f(i)=n(i mod 4y+2), f(i)=-n(i mod 4y+2), f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function. In some possible implementation manners, the f(i) satisfies any one of f(i)=ni, f(i)=-ni, f(i)=n(i mod 4y+2), f(i)=-n(i mod 4y+2), f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function. In some possible implementation manners, the f(i) satisfies any one of f(i)=ni, f(i)=-ni, f(i)=n(i mod 4y+2), f(i)=-n(i mod 4y+2), f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function.

[0087] In some possible implementation manners, b(i') represents a signal to be modulated corresponding to the first modulation signal, and i' represents an index of the signal to be modulated.

[0088] When i' satisfies i'=i, the second modulation signal satisfies any one of d(i')=d(i), d(i')=-d(i), d(i')=d(i)·C, or d(i')=-d(i)·C.

[0089] When i' satisfies any one of i'=2i or i'=2i+1, the second modulation signal satisfies any one of d(i')=d(i), d(i')=-d(i), d(i')=d(i)·C, or d(i')=-d(i)·C.

[0090] When i' satisfies any one of i'=3i, i'=3i+1, or i'=3i+2, the second modulation signal satisfies any one of d(i')=d(i), d(i')=-d(i), d(i')=d(i)·C, or d(i')=-d(i)·C.​​​​​​ or, or, or, or, or, or, or, or, or, or, or,

[0091] In some possible implementations, b(i') represents the signal to be modulated corresponding to the first modulated signal, and i' represents the index of the signal to be modulated; when i' satisfies: i'=i, the second modulated signal satisfies the following conditions: or, or,

[0092] When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions: or, or, or, or,

[0093] When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions: or, or, or, or, or, or, or, or, or, or, or,

[0094] In a fifth aspect, a communication device is provided, which includes: a processing unit, used to modulate a modulated signal according to a first modulation method to obtain a first modulated signal, the first modulation method including modulating the phase of the modulated signal; the processing unit is also used to: modulate the first modulated signal according to a second modulation method to obtain a second modulated signal, the second modulation method including modulating the amplitude of the first modulated signal according to a first coefficient A, the first coefficient A is at least related to any one of the following: a roll-off factor α, or a spectrum expansion factor β; a transceiver unit, used to send the second modulated signal.

[0095] In some possible implementation manners, the second modulation signal includes a real part signal and an imaginary part signal, and the transceiving unit is specifically configured to transmit the real part signal and the imaginary part signal, and the real part signal and the imaginary part signal have a time interval.

[0096] In some possible implementation manners, the time interval is greater than or equal to T / 2, and T is a transmission period of the second modulation signal in the time domain.

[0097] In some possible implementation manners, the first coefficient A satisfies: A=α+1, or A=1 / (1-β), or A=1 / (α+1), or A=1-β.

[0098] In some possible implementation manners, transmitting the second modulation signal includes: transmitting the second modulation signal and a pilot symbol, the second modulation signal and the pilot symbol are located in a same time unit, the pilot symbol includes a frequency domain sequence that is not subjected to time domain processing, and a bandwidth for transmitting the pilot symbol is the same as a bandwidth for transmitting the second modulation signal.

[0099] For example, transmitting the second modulation signal includes: transmitting the second modulation signal and a pilot symbol in a same time unit (for example, a same radio frame), the pilot symbol includes a frequency domain pilot signal, for example, a Zadoff-Chu sequence (also referred to as a ZC sequence) or an m sequence of a QPSK signal. The second modulation signal includes the single carrier signal subjected to the bandwidth expansion / compression, and the pilot symbol includes a signal that is not subjected to the bandwidth expansion / compression (that is, the pilot symbol indicates that the signal is directly mapped to a bandwidth after the bandwidth expansion / compression, without being subjected to the DFT and the bandwidth expansion / compression operations as the second modulation signal, and the bandwidth after the expansion / compression is used to transmit the second modulation signal and the pilot symbol).

[0100] In some possible implementation manners, the frequency domain sequence includes a constant modulus sequence.

[0101] For example, the frequency domain sequence includes a ZC sequence or an m sequence.

[0102] Based on the scheme provided in the embodiments of the present application, the signal is subjected to amplitude modulation by the first coefficient A, so that the energy of the second modulation signal obtained by modulation is more consistent with the energy of the pilot symbol, the performance of correct demodulation of the signal is improved, and therefore the communication performance can be improved.

[0103] In some possible implementation manners, the second modulation signal satisfies the following condition:

[0104] wherein, i represents an index of the second modulation signal, d(i) represents the second modulation signal, C represents a normalization coefficient, f(i) represents a rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents a common rotation phase value.

[0105] In some possible implementation manners, a value of B of the PAM_signal represents an energy level corresponding to the first modulation signal, and B satisfies any one of the following: B∈{1;-1;3;-3;...;(2x-1);-(2x-1)}, where x is an integer greater than or equal to 1.

[0106] In some possible implementation manners, the Com_Phase_Rot satisfies: Com_Phase_Rot=e jθ , θ=aπ / 4, where a is a number greater than or equal to 0.

[0107] In some possible implementation manners, the f(i) satisfies: f(i)=0; or, f(i)=n(i mod 4y+2), or, f(i)=-n(i mod 4y+2), or, f(i)=n(i mod 4y), or, f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents a remainder function; and the processing unit is specifically configured to modulate an amplitude of the first modulation signal according to the normalization coefficient C, which satisfies any one of the following:

[0108] In some possible implementation manners, b(i') represents a to-be-modulated signal corresponding to the first modulation signal, and i' represents an index of the to-be-modulated signal; when i' satisfies any one of the following: i'=2i, or, i'=2i+1, the second modulation signal satisfies the following condition: or, when i' satisfies any one of the following: i'=4i, or, i'=4i+1, or, i'=4i+2, or, i'=4i+3, the second modulation signal satisfies the following condition:

[0109] ​​​​​​​​​​When i' satisfies any one of the following: i'=6i, or, i'=6i+1, or, i'=6i+2, or, i'=6i+3, or, i'=6i+4, or, i'=6i+5, the second modulation signal satisfies the following condition: or, or, or, or, or, or, or, or, or, or, or,

[0110] In some possible implementation manners, b(i') represents a signal to be modulated corresponding to the first modulation signal, and i' represents an index of the signal to be modulated.

[0111] When i' satisfies: i'=i, the second modulation signal satisfies the following condition: or,

[0112] When i' satisfies any one of the following: i'=2i, or, i'=2i+1, the second modulation signal satisfies the following condition: or, or,

[0113] When i' satisfies any one of the following: i'=3i, or, i'=3i+1, or, i'=3i+2, the second modulation signal satisfies the following condition: or, or, or, or, or, mod represents a remainder function.

[0114] In a sixth aspect, a communication apparatus is provided, and the apparatus includes: a transceiver unit, configured to receive a second modulation signal; and a processing unit, configured to demodulate the second modulation signal according to a first coefficient A.

[0115] In a seventh aspect, a communication apparatus is provided, which has the function of implementing the method in the above-mentioned first aspect to third aspect and any possible implementation manner thereof, for example, the communication apparatus includes a module or unit or means corresponding to the operation involved in the method in the above-mentioned first aspect to fourth aspect and any possible implementation manner thereof, which can be implemented by software, or by hardware, or by a combination of software and hardware.

[0116] In an eighth aspect, a communication apparatus is provided, which comprises one or more processors. The one or more processors can execute part or all of the computer programs or instructions stored in the memory to implement the functions involved in the methods in the first aspect to the third aspect and any possible implementation manner thereof, when the computer programs or instructions are executed, so that the communication apparatus implements the methods in the first aspect to the third aspect and any possible implementation manner thereof.

[0117] In some possible implementation manners, the communication apparatus can further comprise an interface circuit, wherein the processor is configured to communicate with other apparatuses or components through the interface circuit.

[0118] In some possible implementation manners, the communication apparatus can further comprise the memory.

[0119] The communication apparatus can be a terminal, or a communication module in the terminal, or a chip responsible for communication functions in the terminal, such as a modem chip (also known as a baseband chip) or a SoC or SIP chip containing a modem module.

[0120] In a ninth aspect, a communication apparatus is provided, which comprises a processor configured to execute computer instructions to cause the apparatus to perform the methods in the first aspect to the third aspect and any possible implementation manner thereof.

[0121] In some possible implementation manners, the apparatus further comprises a memory.

[0122] In some possible implementation manners, the apparatus further comprises a communication interface coupled to the processor, and the communication interface is configured to input and / or output information.

[0123] In a tenth aspect, a computer program product is provided, which implements the methods in the first aspect to the third aspect and any possible implementation manner thereof when a computer program in the computer program product is executed by a communication apparatus.

[0124] In an eleventh aspect, a computer-readable storage medium is provided, which stores a computer program or instructions, and the computer program or instructions, when executed by a communication apparatus, implement the methods in the first aspect to the third aspect and any possible implementation manner thereof.

[0125] In a twelfth aspect, a chip (or chip system) is provided, which comprises at least one processor configured to run a computer program to cause an apparatus installed with the chip to perform the methods in the first aspect to the third aspect and any possible implementation manner thereof.

[0126] The chip can include an output circuit or interface for sending information or data, and an input circuit or interface for receiving information or data.

[0127] In a thirteenth aspect, a communication system is provided, including: a network device and a terminal device, the terminal device being configured to perform the method in the first aspect to the third aspect and any possible implementation manner thereof, and / or the network device being configured to perform the method in the first aspect to the third aspect and any possible implementation manner thereof. BRIEF DESCRIPTION OF DRAWINGS

[0128] FIG. 1 is a schematic diagram of a communication system suitable for embodiments of the present application.

[0129] FIG. 2 is a schematic diagram of a processing flow of a DFTs-OFDM technology according to an embodiment of the present application.

[0130] FIG. 3 is a constellation diagram of BPSK modulation and π / 2-BPSK modulation according to an embodiment of the present application.

[0131] FIG. 4 is a schematic diagram of a 16QAM constellation according to an embodiment of the present application.

[0132] FIG. 5 is a schematic diagram of a signal processing flow of a transmitter based on π / 2-BPSK modulation or QAM according to an embodiment of the present application.

[0133] FIG. 6 is a schematic diagram of a signal transmission waveform based on π / 2-BPSK modulation or QAM according to an embodiment of the present application.

[0134] FIG. 7 is a schematic diagram of a signal processing flow of an SC-OQAM transmitter according to an embodiment of the present application.

[0135] FIG. 8 is a schematic diagram of an SC-OQAM signal transmission waveform according to an embodiment of the present application.

[0136] FIG. 9 is a schematic diagram of a DFT-S-OFDM transmitter based on FDSS according to an embodiment of the present application.

[0137] FIG. 10 is a schematic diagram of frequency domain shaping of DFT-S-OFDM according to an embodiment of the present application.

[0138] FIG. 11 is a schematic diagram of a method of signal transmission or reception according to an embodiment of the present application.

[0139] FIG. 12 is a schematic diagram of a method of determining a modulation mode according to an embodiment of the present application.

[0140] FIG. 13 is a schematic block diagram of a communication apparatus according to an embodiment of the present application.

[0141] FIG. 14 is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0142] The technical solutions in the present application will be described below with reference to the drawings.

[0143] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the application and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It also will be understood that the term “and / or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0144] Reference throughout this specification to “one embodiment”, “an embodiment”, or “a specific embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrases “in one embodiment” or “in an embodiment” or “in some embodiments” or “in other embodiments” or “in still other embodiments” in various places throughout this specification are not necessarily all referring to the same embodiment, unless otherwise indicated. Furthermore, the terms “comprises”, “comprising”, “includes”, “including”, “has”, “having”, “contains”, “containing” or variations thereof are intended to mean “including but not limited to”, unless otherwise indicated.

[0145] The technical solutions provided in the present application can be applied to various communication systems, for example: a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a wireless local area network (WLAN) system, a narrow band-internet of things (NB-IoT) system, a global system for mobile communications (GSM), an enhanced data rate for GSM evolution (EDGE), a wideband code division multiple access (WCDMA) system, a code division multiple access 2000 (CDMA2000) system, a time division-synchronization code division multiple access (TD-SCDMA) system, a 5th generation (5G) or new radio (NR) system, and a future mobile communication system, a future network architecture, a future evolution system, and the like (for example, a higher version of a communication system).

[0146] The technical solutions provided in the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and an internet of things (IoT) communication system or other communication systems.

[0147] In the embodiments of the present application, a terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The embodiments of the present application are described by taking a terminal device as an example.

[0148] FIG. 1 is a schematic diagram of a wireless communication system 100 applicable to embodiments of the present application. As shown in FIG. 1, the wireless communication system includes a radio access network 100. The radio access network 100 can be a (e.g., higher version) radio access network in future mobile communication systems, future network architecture, future evolved systems, etc., or a legacy (e.g., 5G, 4G) radio access network. One or more terminal devices (120a-120j, collectively referred to as 120) can be connected to each other or to one or more network devices (110a, 110b, collectively referred to as 110) in the radio access network 100. Network elements in the wireless communication system are connected through interfaces (e.g., NG, Xn) or air interfaces.

[0149] FIG. 1 is only a schematic diagram, and the wireless communication system can further include other devices, such as a core network (CN) device, a wireless relay device, and / or a wireless backhaul device, etc., which are not shown in FIG. 1.

[0150] The terminal device 120 can be a device that provides voice / data, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. Currently, some examples of the terminal device 120 are: a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc., and embodiments of the present application do not limit the same.

[0151] In the embodiments of the present application, the apparatus for implementing the functions of the terminal device 120, i.e., the terminal apparatus, can be a terminal device or an apparatus capable of supporting the terminal device to implement the functions, such as a chip system or a chip, which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip or can include a chip and other discrete devices.

[0152] In the mobile communication system 100, the network device 110 in the embodiments of the present application can be a device for communicating with the terminal device, and the network device 110 can also be referred to as an access network device or a radio access network (RAN) node (or device), such as a network device 110 can be a base station. The network device 110 in the embodiments of the present application can refer to a radio access network that accesses the terminal device 120 to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, auxiliary station, motor slide retainer (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station can also refer to a communication module, modem, or chip for being disposed in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device assuming a base station function in D2D, V2X, M2M communication, a future mobile communication system, a future network architecture, a network side device in a future evolved system, a device assuming a base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network device.

[0153] In some deployments, the network device mentioned in the embodiments of the present application can be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane (CU-CP)) and a user plane CU node (central unit-user plane (CU-UP)), and a DU node.

[0154] In different systems, the CU (or CU-CP and CU-UP), DU or radio unit (RU) can also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (ORAN) system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0155] In the embodiments of the present application, the apparatus for implementing the functions of the network device 110 can be a network device, or an apparatus capable of supporting the network device to implement the functions, such as a chip system or a chip, which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0156] In the embodiments of the present application, one device in the communication system 100 can send a signal to another device or receive a signal from another device. Wherein, the signal can include information, signaling or data, etc.; the device can also be replaced by an entity, a network entity, a communication device, a communication module, a node, a communication node, etc., which is described in the present application by taking the device as an example. For example, the communication system 100 can include at least one terminal device 120 and at least one network device 110. The network device 110 can send a downlink signal to the terminal device 120, and / or the terminal device 120 can send an uplink signal to the network device 110.

[0157] In the embodiments of the present application, before a device transmits a signal to another device or after receiving a signal transmitted by another device, the signal needs to be modulated (mod) or demodulated (de-mod) so that the information to be transmitted can be carried on a radio signal or can be parsed from the radio signal. In a communication system, the information to be transmitted can be represented by bits "0" or "1", and through modulation of the signal, the bits can be carried on an analog signal with frequency, amplitude, and phase.

[0158] It should be understood that FIG. 1 is a simplified schematic diagram for ease of understanding, which is an example of a communication system applicable to the embodiments of the present application, and other network devices or other terminal devices can also be included in the communication system, which are not shown in FIG. 1. The embodiments of the present application can be applied to any communication scenario of communication between a transmitting device and a receiving device.

[0159] The communication system to which the embodiments of the present application are applied is not limited to this, and in actual applications, the embodiments of the present application are applicable to scenarios with a requirement of low peak to average power ratio (PAPR) or to service scenarios with a requirement of low PAPR and high link quality.

[0160] It should be understood that FIG. 1 is a simplified schematic diagram for ease of understanding, and other network devices or other terminal devices can also be included in the communication system, which are not shown in FIG. 1.

[0161] It should also be understood that FIG. 1 is only an example of an application scenario of the embodiments of the present application, and the present application is not limited to the scenario to which the method is applied. The present application can be applied to communication between network devices, communication between a network device and a terminal device, communication between terminal devices, and the like, and the embodiments of the present application are not limited thereto.

[0162] The fast fourier transformation (FFT) described in the present application is a fast algorithm for implementing a discrete fourier transform (DFT). The FFT described in the present application can also be replaced by other algorithms that can implement a fourier transform, which is not limited in the present application. The inverse fast fourier transformation (IFFT) is a fast algorithm for implementing an inverse discrete fourier transform (IDFT). The IFFT described in the present application can also be replaced by other algorithms that can implement a fourier inverse transform, which is not limited in the present application.

[0163] In the embodiments shown below, the method provided by the embodiments of the present application is described in detail by taking the interaction between the network device and the terminal device as an example for the convenience of understanding and description.

[0164] For the convenience of understanding the embodiments of the present application, the terms involved in the embodiments of the present application are briefly introduced as follows.

[0165] (1) Discrete fourier transform spreading orthogonal frequency division multiplexing (DFT-s-OFDM)

[0166] Wireless signals are observed as sinusoidal waves with varying amplitudes in the time domain, and the amplitudes are not constant. In a long time, the peak power is the maximum transient power that occurs with a certain probability, and this probability is usually 0.01%. The ratio of the peak power at this probability to the total average power of the system is PAPR, simply referred to as peak-to-average ratio. In a communication system based on orthogonal frequency division multiplexing (OFDM) technology, the signal on a certain carrier is represented as a sinc function, and there will be a tail on the left and right sides. The tails of multiple carriers may, under certain probability, be superimposed in the distance to form a point with a very large peak power.

[0167] The signal of a wireless communication system needs to be amplified to be transmitted to a distance. Since the dynamic range of a general power amplifier is limited, a signal with a large PAPR is likely to enter the nonlinear region of the power amplifier, resulting in nonlinear distortion of the signal and a serious decline in the performance of the entire system. Therefore, how to reduce the PAPR of the signal is an urgent problem to be solved.

[0168] DFT-s-OFDM technology is one of the signal generation methods of the uplink of LTE. The DFT-s-OFDM technology has an additional DFT (discrete fourier transform) processing before the traditional OFDM (orthogonal frequency division multiplexing) processing process, and therefore the DFT-s-OFDM technology can also be called linear precoding OFDM technology.

[0169] Referring to FIG. 2, FIG. 2 is a processing flow diagram of the DFT-s-OFDM technology provided in the embodiments of the present application. In FIG. 2, the sending end modulates the bits, performs N-point DFT, subcarrier mapping, IFFT, and adds CP (cyclic prefix) in sequence to obtain a transmission data stream, and then transmits the transmission data stream through RF (radio frequency). When the receiving end receives the transmission data stream, the receiving end performs CP & FFT, subcarrier demapping, equalizer, IDFT, and demodulation (also called demodulation) in sequence on the transmission data stream to obtain the bits. Adding CP can avoid symbol interference.

[0170] The essence of DFT-s-OFDM is still single carrier. Physically, the operation of DFT-s-IFFT is actually equivalent to convolution of the input signal before DFT and a sinc waveform. Since the essence is still single carrier, compared with OFDM, the PAPR of DFT-s-OFDM is relatively low, which can improve the power transmission efficiency of the mobile terminal, prolong the use time of the battery, and reduce the cost of the terminal.

[0171] (2) BPSK modulation and π / 2-BPSK modulation

[0172] PSK (phase shift keying) modulation is to represent bits "1" or "0" by changing the phase value of the carrier signal. When the waveform of an electromagnetic wave represents a bit, it is also called BPSK. π / 2-BPSK modulation is an enhancement of BPSK modulation. On the basis of BPSK modulation, a certain phase offset can be performed on the symbol. The zth symbol after BPSK modulation is multiplied by a phase (BPSK modulation symbol * e j2πzK, K is a phase shift coefficient), which is called rotated BPSK. For example, the π / 2-BPSK modulation can also be called the π / 2 rotated BPSK modulation. In the BPSK modulation, the phase difference between the input bit "1" and the input bit "0" is π or -π, that is, the absolute value of the phase difference is π. In the π / 2-BPSK modulation, the phase difference between the kth modulation symbol and the (k-1)th modulation symbol is equal to the phase difference between the kth modulation symbol and the (k+1)th modulation symbol, and the absolute value of the phase difference is π / 2. For example, the first modulation symbol is selected from {+1, -1} according to the first input bit "1" or "0", for example, the first input bit is "1" and +1 is selected, and the second input bit is "0" and -1 is selected; the second modulation symbol is selected from {+j, -j} according to the second input bit, for example, the second input bit is "1" and +j is selected, and the second input bit is "0" and -j is selected; the third modulation symbol is selected from {+1, -1} according to the third input bit, and the fourth modulation symbol is selected from {+j, -j} according to the fourth input bit, and so on. Wherein, the kth modulation symbol is any one of the modulation symbol stream, and π is the circular constant.

[0173] For example, referring to FIG. 3, FIG. 3 is a schematic diagram of the modulation provided by the embodiment of the application. As shown in FIG. 3, in the BPSK modulation, there is a phase jump with an absolute value of π in the conversion process of the input bit "1"→"0" or "0"→"1", which will cause the PAPR of the signal to rise; in the π / 2-BPSK modulation, the absolute value of the phase difference between the adjacent two modulation symbols is π / 2, which changes from π to π / 2, and can suppress the PAPR of the signal.

[0174] It can be understood that the modulation symbol obtained by using the π / 2-BPSK modulation is obtained by phase rotating the modulation symbol obtained by using the BPSK modulation, and the phase rotation factor is ef(i)×j×π / 2, f(i)=i mod 2, i represents the index of the modulation symbol, and mod represents the remainder function. The index can be numbered from "1". For example, the index is numbered from "1", the modulation symbol obtained by using the BPSK modulation includes -1, 1, 1, -1, 1; and the modulation symbol obtained by using the π / 2-BPSK modulation includes -j, -1, -j, -1, j.

[0175] For example, the formula of the π / 2-BPSK modulation can satisfy the following conditions:

[0176] The common rotation phase of the π / 2-BPSK modulation is set to π / 4 (i.e., each modulation symbol obtained by the π / 2-BPSK modulation is rotated by π / 4), when the index of the signal is an odd number of 1, 3, 5, 7, 9,..., the constellation point information carried by the symbol modulated by the π / 2-BPSK modulation formula is [0.707+0.707j] or [-0.707-0.707j]. When the index of the signal is an even number of 2, 4, 6, 8, 10,..., the constellation point information carried by the symbol modulated by the π / 2-BPSK modulation formula is [0.707-0.707j] or [-0.707+0.707j]. It can be seen that, regardless of whether the bit being modulated is "0" or "1", the phase difference between the constellation point obtained by modulating the signal with an odd index by the π / 2-BPSK modulation formula and the constellation point obtained by modulating the signal with an even index by the π / 2-BPSK modulation formula is fixed at 90°.

[0177] In order to more intuitively understand the modulation mode, a constellation diagram can be used, which helps to define the amplitude and phase of the symbol obtained after modulation. In the constellation diagram, one symbol obtained after modulation is represented by one constellation point, and the bits or bit combination carried by the constellation point are generally written beside it. In the constellation diagram, there are generally two axes, of which the horizontal axis is related to the in-phase carrier, and the vertical axis is related to the quadrature carrier. The projection of each constellation point in the constellation diagram on the horizontal axis defines the peak amplitude of the in-phase component, and the projection on the vertical axis defines the peak amplitude of the quadrature component. The length of the line (vector) from the constellation point to the origin is the peak amplitude of the symbol, and the angle between the line and the horizontal axis is the phase of the symbol. The unit power P of the constellation diagram of the modulation mode includes the average value of the square of the distance between each constellation point and the origin.

[0178] Referring to FIG. 4, FIG. 4 is a schematic diagram of a constellation diagram of 16 quadrature amplitude modulation (16QAM) provided by an embodiment of the present application. One constellation point (or also described as one modulation symbol) on the constellation diagram can correspond to four information bits, and there are 2^4 = 16 symbols in 16QAM, each symbol has its own amplitude and phase. There can be multiple amplitudes in 16QAM, and the phases between each symbol are also different.

[0179] The possible implementation of π / 2-BPSK modulation or QAM is described in detail below in combination with FIG. 5 and FIG. 6. FIG. 5 is a signal processing schematic flow chart of a transmitting end based on π / 2-BPSK modulation or QAM according to an embodiment of the present application. FIG. 6 is a schematic diagram of a signal transmission waveform based on π / 2-BPSK modulation or QAM according to an embodiment of the present application. Referring to the signal processing schematic flow chart shown in FIG. 5, the transmitting end modulates the signal, performs 2 times up-sampling (up-sampling(2)), pulse shaping and down-sampling in sequence. Referring to the waveform schematic diagram shown in FIG. 6, the waveform of the modulated symbol obtained by transmitting π / 2-BPSK modulation is complex orthogonal, that is, one waveform carries one complex signal, and the relationship between this waveform and the next waveform carrying signal is orthogonal (that is, the waveform is 0 at the sampling point of the next waveform carrying signal), and such orthogonality reduces multipath interference.

[0180] The modulated symbol obtained by π / 2-BPSK modulation can also be applied to single carrier offset quadrature amplitude modulation (SC-OQAM). SC-OQAM is to separate the real part and the imaginary part of the modulated symbol obtained by π / 2-BPSK modulation or QAM and make the real part and the imaginary part cross, delay the real part / imaginary part, so that the real part and the imaginary part of one modulated symbol are transmitted on different waveforms respectively. For example, the real part / imaginary part can be delayed by T / 2 (T is the period of the waveform of the transmitted signal), and the complex orthogonal relationship of the waveform of the transmitted signal is changed into the partial orthogonal relationship of the real part / imaginary part of the signal.

[0181] The possible implementation of SC-OQAM is described in detail below in combination with FIG. 7 and FIG. 8. FIG. 7 is a signal processing schematic flowchart of a SC-OQAM transmitting end according to an embodiment of the present application. FIG. 7 is a schematic diagram of a SC-OQAM signal transmission waveform according to an embodiment of the present application. Referring to the SC-OQAM signal processing schematic flowchart shown in FIG. 7, compared with the signal processing schematic flowchart shown in FIG. 5, the transmitting end separates the real part and the imaginary part of the modulated signal after the signal is modulated based on π / 2-BPSK or QAM, and then performs 2 times of upsampling on the real part and the imaginary part, and delays the imaginary part signal by T / 2 (it can be understood that the real part signal can also be delayed by T / 2, and the embodiments of the present application do not limit this). Referring to the waveform schematic diagram shown in FIG. 8, one SC-OQAM waveform carries the real part or the imaginary part of the signal alone. Although this waveform is not orthogonal to the next waveform carrying the signal (i.e., the waveform is not 0 at the sampling point of the next waveform carrying the signal), since the information carried by this waveform and the next waveform carrying the signal is orthogonal, the interference is orthogonal to the signal. Due to this partial orthogonality, the receiving end can discard the imaginary part when receiving the real number signal, and discard the real part when receiving the imaginary number signal, so as to correctly recover the information.

[0182] The advantage of SC-OQAM is that the peak of the waveform carrying the real number signal will superimpose the non-peak of the waveform carrying the imaginary number signal, and this staggered peak method can effectively reduce the PAPR and improve the link quality. However, the SC-OQAM modulation method using π / 2-BPSK can only carry 1 bit of information for one modulation symbol, resulting in low spectral efficiency. Moreover, the implementation of SC-OQAM can only be based on the modulation symbol obtained through π / 2-BPSK modulation or QAM, and the implementation of SC-OQAM is not flexible enough.

[0183] For example, the modulation order of the SC-OQAM modulation using π / 2-BPSK is 2, where the modulation order = 2 x x is the number of bits carried by the symbol obtained after modulation, and x = 1 for one modulation symbol obtained through SC-OQAM modulation using π / 2-BPSK.

[0184] (3) Frequency domain spectral shaping (FDSS)

[0185] According to the convolution theorem, 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, after a set of discrete time domain data is converted into discrete frequency domain data through DFT, and then multiplied by a designed spectrum shaping sequence, and then the time domain signal after IDFT can effectively reduce the PAPR. Since the complexity of the point multiplication operation is lower than that of the convolution operation, this PAPR reduction technology operates better in the frequency domain, so this technology is called FDSS.

[0186] If the FDSS technology is applied to the DFT-s-OFDM waveform processing of the 5G uplink, the PAPR of the 5G uplink signal can be further reduced. The basic idea is that in the frequency domain data after the DFT and before the inverse fast Fourier transmission (IFFT) in the DFT-s-OFDM waveform processing process, a designed spectrum shaping sequence is multiplied.

[0187] The time domain implementation of SC-OQAM is introduced above in combination with FIG. 7, and the frequency domain implementation of SC-OQAM is introduced below in combination with FIG. 9 and FIG. 10. FIG. 9 is a sending end schematic diagram of DFT-S-OFDM based on FDSS provided by an embodiment of the present application. FIG. 10 is a frequency domain shaping schematic diagram of DFT-S-OFDM provided by an embodiment of the present application.

[0188] Referring to the sending end schematic diagram shown in FIG. 9, the signal based on π / 2-BPSK modulation or QAM used in the DFT-S-OFDM system is separated into real and imaginary parts, and then a two-fold upsampling is performed, that is, the real part signal becomes [X, 0, X, 0, X, 0, …], the imaginary part signal becomes [jY, 0, jY, 0, jY, 0, …], then a time delay is performed on the imaginary part signal, the imaginary part signal becomes [0, jY, 0, jY, 0, jY, …], and the real part signal after upsampling and the imaginary part signal after upsampling are combined to become [X, jY, X, jY, X, jY, …], and the total length of the signal becomes 2 times the length of the original π / 2-BPSK modulation or QAM obtained signal. Subsequently, the real and imaginary part separated symbols are sequentially subjected to 2N-point DFT, filter, subcarrier mapping and IFFT. The filter (the filter can be used to implement FDSS) in FIG. 9 can adopt a spectrum extension / compression raised cosine roll-off filter, for example, the original bandwidth is 10MHz, and after FDSS with α=0.2, the occupied bandwidth is 12MHz. The filter in FIG. 9 can also adopt a spectrum extension / compression root raised cosine roll-off filter and the like to realize spectrum extension / compression, and the specific filter to be adopted is not limited in the embodiments of the present application.

[0189] Referring to the frequency domain shaping diagram shown in FIG. 10, due to the separation of real and imaginary parts, the length of the modulated signal is twice that of the conventional π / 2-BPSK modulation, and the size of the DFT is also twice that of the DFT size of the conventional π / 2-BPSK modulation. The signal after the DFT has a characteristic that the spectrum has a conjugate symmetry characteristic: s(n) = s (N-n) That is, D and Flip(D*) shown in FIG. 10. Therefore, the data after the DFT is actually redundant, and the redundant signal can be subjected to a truncated frequency domain filtering process. The truncation refers to that the bandwidth of the filter is smaller than the bandwidth after the DFT. For example, the bandwidth after the DFT is 100 resource blocks (RBs), and the frequency domain filter can be designed to be a filter with an α of 0.2 such that 100 RBs→60 RBs. The filtering process is that the frequency domain filter directly multiplies the signal after the DFT. Since the signal is redundant, the truncation of the filtering does not cause performance loss. After the truncation, IFFT, CP addition, and transmission can be performed.

[0190] Wireless signals are observed in the time domain as sinusoidal waves with varying amplitudes. The amplitudes are not constant, and the peak amplitude in one period is different from the peak amplitude in another period. Therefore, the average power of each period is different from the peak power. In a long period of time, the peak power is the maximum transient power that occurs with a certain probability, and the probability is usually 0.01%. The ratio of the peak power to the total average power at this probability is the peak-to-average power ratio (PAPR), which is simply referred to as the peak-to-average ratio. In a communication system based on OFDM technology, the signal on a carrier is represented by a sinc function, and there are tails on the left and right sides. The tails of multiple carriers may, at a certain probability, superimpose to form a point with a very large peak power.

[0191] Wireless communication system signals are transmitted to a distance, and need to be power amplified. Since the dynamic range of a general power amplifier is limited, a signal with a large PAPR is likely to enter the nonlinear region of the power amplifier, causing nonlinear distortion of the signal and a serious decline in the performance of the entire system. Therefore, how to reduce the PAPR of the signal is a technical problem to be solved.

[0192] In view of this, the embodiments of the present application provide a signal transmission method and a communication device, which can obtain a lower PAPR and improve the link quality by designing the modulation mode of the signal.

[0193] The signal transmission method provided by the embodiments of the present application will be described below.

[0194] FIG. 11 is a schematic diagram of a method 1100 of signal sending or receiving according to an embodiment of the present application. As shown in FIG. 11, the method 1100 can include the following steps.

[0195] S1101, modulating the to-be-modulated signal according to a first modulation mode to obtain a first modulated signal.

[0196] Specifically, the sending end of the signal can modulate the to-be-modulated signal according to the first modulation mode to obtain the first modulated signal. The first modulation mode can include modulating the amplitude of the to-be-modulated signal, or the first modulation mode can include modulating the phase of the to-be-modulated signal.

[0197] When the first modulation mode includes modulating the amplitude of the to-be-modulated signal, the first modulation mode can be a modulation mode of mapping the discrete amplitude of the digital signal to the continuous amplitude. For example, pulse amplitude modulation (PAM). The principle of PAM modulation is to change the amplitude of the carrier in each discrete time interval according to the amplitude value of the original digital signal, so that the carrier can carry the information of the original digital signal. PAM modulation can increase the information capacity of transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in 2PAM modulation, the number of energy levels corresponding to the amplitude is 1, and the value B of the first modulated signal obtained by modulating the amplitude of the carrier can take any one of {1; -1}, one modulated signal carries 1 bit of information, and the modulation order is 2 1 = 2; in 4PAM modulation, the number of energy levels corresponding to the amplitude is 2, and the value B of the first modulated signal obtained by modulating the amplitude of the carrier can take any one of {1; -1; 3; -3}, one modulated signal carries 2 bits of information, and the modulation order is 2 2 = 4; in 8PAM modulation, the number of energy levels corresponding to the amplitude is 4, and the value B of the first modulated signal obtained by modulating the amplitude of the carrier can take any one of {1; -1; 3; -3; 5; -5; 7; -7}, one modulated signal carries 3 bits of information, and the modulation order is 2 3 = 8.

[0198] It can be understood that in PAM modulation of different modulation orders, the value B of the first modulated signal obtained by modulating the amplitude of the carrier can satisfy: B ∈ {1; -1; 3; -3;... ; (2x-1); -(2x-1)}, x is an integer greater than or equal to 1.

[0199] The first modulation mode can be a modulation mode of changing the phase of the carrier, for example, BPSK modulation, when the phase of the to-be-modulated signal is modulated. Alternatively, the first modulation mode can be a modulation mode of mapping the discrete amplitude of the digital signal to the continuous amplitude and phase, for example, QAM.

[0200] The PSK modulation can increase the information capacity of transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in the BPSK modulation, the number of energy levels corresponding to the amplitude is 1, the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1}, one modulated signal carries 1 bit of information, and the modulation order is 2 1 = 2. In the quadrature phase shift keying (QPSK) modulation, the number of energy levels corresponding to the amplitude is 2, the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1; 3; -3}, one modulated signal carries 2 bits of information, and the modulation order is 2 2 = 4.

[0201] The QAM can increase the information capacity of transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in the 4QAM modulation, the number of energy levels corresponding to the amplitude is 1, the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1}, one modulated signal carries 2 bits of information (wherein 1 bit of information represents the amplitude, and the other 1 bit of information represents the phase), and the modulation order is 2 2 = 4. In the 16QAM modulation, the number of energy levels corresponding to the amplitude is 2, the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1; 3; -3}, one modulated signal carries 4 bits of information (wherein 2 bits of information represent the amplitude, and the other 2 bits of information represent the phase), and the modulation order is 2 4 = 16. In the 64QAM modulation, the number of energy levels corresponding to the amplitude is 4, the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1; 3; -3; 5; -5; 7; -7}, one modulated signal carries 6 bits of information (wherein 3 bits of information represent the amplitude, and the other 3 bits of information represent the phase), and the modulation order is 2 6 = 64.

[0202] It can be understood that the value B of the energy level corresponding to the first modulation signal obtained by modulating the amplitude of the carrier in the QAM modulation of different modulation orders can satisfy any one of B∈{1;-1;3;-3;...;(2x-1);-(2x-1)},x is an integer greater than or equal to 1.

[0203] It can be understood that the first modulation mode can be a 2-order, 4-order, 8-order or higher-order modulation mode. If the modulation mode is 4-order, each first modulation signal carries 2-bit information. If the modulation mode is 8-order, each first modulation signal carries 3-bit information. If the modulation mode is 16-order, each first modulation signal carries 4-bit information.

[0204] It can be understood that the modulation order of the first modulation mode, the number of bits of the information carried by the first modulation signal obtained according to the first modulation mode, and the value range of the value of the energy level corresponding to the first modulation signal are only examples. Those skilled in the art can derive higher-order modulation modes, first modulation signals, corresponding relationships of higher-order modulation modes and first modulation signals, and value ranges of values of energy levels corresponding to first modulation signals according to the above examples without any creative labor. The embodiments of the present application do not limit this.

[0205] It can be understood that the sending end of the signal can be a terminal device, and the terminal device can send the signal obtained by the method 1100 to a network device / another terminal device. Alternatively, the sending end of the signal can be a network device, and the network device can send the signal obtained by the method 1100 to a terminal device / another network device. The embodiments of the present application do not limit this.

[0206] S1102, modulating the first modulation signal according to a second modulation mode to obtain a second modulation signal.

[0207] Specifically, the sending end of the signal can modulate the first modulation signal according to a second modulation mode to obtain a second modulation signal. The second modulation mode can include phase modulation, and the second modulation signal is a complex signal, or the second modulation mode can include modulating the amplitude of the first modulation signal according to a first coefficient A.

[0208] In some possible implementation manners, after obtaining the first modulated signals by modulating the amplitudes of the to-be-modulated signals according to the first modulation manner, the signal sending end can modulate the plurality of first modulated signals according to a second modulation manner to obtain m second modulated signals, where the second modulation manner comprises phase modulation, the second modulated signals are complex signals, m is an integer greater than or equal to 2, and any two adjacent second modulated signals in the time domain satisfy Q = n * π / 2 or Q = - n * π / 2, where n is an integer greater than or equal to 1.

[0209] For example, the phase of the first modulated signal is modulated to obtain m second modulated signals, where any two adjacent second modulated signals in the time domain satisfy: the phase of the latter second modulated signal is greater than that of the former second modulated signal by n * π / 2, for example, the phase of the fifth second modulated signal is 5 * π / 2, the phase of the fourth second modulated signal is 4 * π / 2, and the phase of the third second modulated signal is 3 * π / 2; or any two adjacent second modulated signals in the time domain satisfy: the phase of the latter second modulated signal is less than that of the former second modulated signal by n * π / 2, for example, the phase of the seventh second modulated signal is 3 * π / 2, the phase of the sixth second modulated signal is 4 * π / 2, and the phase of the fifth second modulated signal is 2 * π / 2.

[0210] In some possible implementation manners, the second modulated signal comprises a real part signal and an imaginary part signal.

[0211] In some possible implementation manners, the phase modulation can comprise at least one of the following: modulating the first modulated signal according to a common phase rotation; or modulating the first modulated signal according to a rotating phase value.

[0212] In some possible implementation manners, the phase modulation of the first modulated signal according to the common phase rotation comprises: rotating the phases of the plurality of first modulated signals obtained by the first modulation manner, and the rotating phase value can comprise a common phase rotation value.

[0213] For example, when the common rotating phase value is π / 16, the phases of the plurality of first modulated signals obtained by the first modulation manner are rotated by a phase value of π / 16; when the common rotating phase value is π / 8, the phases of the plurality of first modulated signals obtained by the first modulation manner are rotated by a phase value of π / 8; when the common rotating phase value is π / 4, the phases of the plurality of first modulated signals obtained by the first modulation manner are rotated by a phase value of π / 4; and when the common rotating phase value is π / 2, the phases of the plurality of first modulated signals obtained by the first modulation manner are rotated by a phase value of π / 2.

[0214] For example, when the index i of the second modulation signal is odd, the common phase rotation value is π / 4, and when the index of the second modulation signal is even, the common phase rotation value is -π / 4; or, when the index i of the second modulation signal is odd, the common phase rotation value is -π / 4, and when the index of the second modulation signal is even, the common phase rotation value is π / 4. For another example, when the index i of the second modulation signal is odd, the common phase rotation value is π / 2, and when the index of the second modulation signal is even, the common phase rotation value is 0; or, when the index i of the second modulation signal is odd, the common phase rotation value is 0, and when the index of the second modulation signal is even, the common phase rotation value is π / 2.

[0215] It can be understood that the value of the common phase rotation can be any value, and embodiments of the present application do not limit this.

[0216] In some possible implementation manners, the modulating the first modulation signal according to the phase rotation value comprises: rotating the phase of the first modulation signal obtained through the first modulation manner, and the phase rotation value of the rotation can comprise the phase rotation value.

[0217] For example, when the index i of the second modulation signal is odd, the common phase rotation value is π / 4, and when the index of the second modulation signal is even, the common phase rotation value is -π / 4; or, when the index i of the second modulation signal is odd, the common phase rotation value is -π / 4, and when the index of the second modulation signal is even, the common phase rotation value is π / 4. For another example, the rotation phase value is inπ / 2.

[0218] It can be understood that the phase modulation can comprise the phase rotation and the common phase rotation, or the phase modulation can only comprise the phase rotation or only comprise the common phase rotation. Any phase modulation that rotates the phase of the first modulation signal and makes the phase difference Q of any two adjacent second modulation signals in the time domain satisfy Q=n*π / 2 or Q=-n*π / 2 can be included in the embodiments of the present application. The embodiments of the present application do not limit this.

[0219] Based on the scheme provided in the embodiments of the present application, the modulation signal can be obtained by amplitude modulation, phase modulation or amplitude and phase modulation on the to-be-modulated signal, which enriches the selection of signal modulation modes, so that the device can select and use a flexible modulation mode to modulate the signal according to the actual communication situation, thereby improving the communication performance.

[0220] In some possible implementation manners, after obtaining the first modulation signal modulated according to the first modulation manner on the amplitude of the to-be-modulated signal, the signal sending end can further modulate the amplitude of the first modulation signal according to the first coefficient A, to obtain m second modulation signals, the second modulation manner comprising modulating the amplitude of the first modulation signal according to the first coefficient A, the first coefficient A being at least related to any one of a roll-off factor α or a spectrum extension factor β.

[0221] Specifically, the number of subcarriers for transmitting the modulation signal can be expanded or compressed. Modulating the first modulation signal according to the second modulation manner can comprise modulating the amplitude of the first modulation signal according to the first coefficient A related to the expansion or compression.

[0222] In some possible implementation manners, after obtaining the first modulation signal modulated according to the first modulation manner on the phase of the to-be-modulated signal, the signal sending end can modulate the first modulation signal according to the second modulation manner, to obtain the second modulation signal, the second modulation manner comprising modulating the amplitude of the first modulation signal according to the first coefficient A, the first coefficient A being at least related to any one of a roll-off factor α or a spectrum extension factor β.

[0223] Specifically, the number of subcarriers for transmitting the modulation signal can be expanded or compressed, and modulating the first modulation signal according to the second modulation manner can comprise phase modulation on the first modulation signal and modulating the amplitude of the first modulation signal according to the first coefficient A related to the expansion or compression.

[0224] Without spectrum extension, for the modulated modulation symbol, N' modulation symbols are transmitted, and N' subcarriers are correspondingly allocated for transmission. By spectrum extension, that is, increasing the number of transmission subcarriers, a lower PAPR or a lower block error rate (BLER) can be obtained. The cost of spectrum extension is that more frequency resources are temporarily used, and the spectrum efficiency is reduced. The size of spectrum extension is generally represented by a roll-off factor α or a spectrum extension factor β. The bandwidth occupied by the expanded symbol is 1+α times or 1 / (1-β) times of the original bandwidth. By spectrum compression, that is, reducing the number of transmission subcarriers, the occupation of frequency resources can be reduced, and the spectrum efficiency can be improved. The size of spectrum compression is generally represented by a roll-off factor α or a spectrum extension factor β. The bandwidth occupied by the compressed symbol is 1 / (1+α) times or 1-β times of the original bandwidth.

[0225] The size of the roll-off factor a can satisfy: a=(number of transmission subcarriers / number of QAM modulation symbols)-1; or a=(transmission signal bandwidth / QAM symbol rate)-1; or a=(transmission signal bandwidth / signal Nyquist bandwidth)-1. The size of the spectrum spreading factor β can satisfy: β=(number of transmission subcarriers-number of QAM modulation symbols) / number of transmission subcarriers; or β=(transmission signal bandwidth-QAM symbol rate) / transmission signal bandwidth; or β=(transmission signal bandwidth-signal Nyquist bandwidth) / transmission signal bandwidth.

[0226] Based on the scheme provided in the embodiments of the present application, by expanding the number of subcarriers of the transmission modulation signal, the PAPR of signal transmission can be reduced, the link quality can be improved, or by compressing the number of subcarriers of the transmission modulation signal, the occupation of frequency resources can be reduced, the spectrum efficiency can be improved, and thus the communication performance can be improved.

[0227] In some possible implementation ways, the amplitude of the first modulation signal can be modulated according to the first coefficient A, which can include: multiplying the amplitude of the first modulation signal by the first coefficient A.

[0228] For example, the amplitude of the first modulation signal is multiplied by the first coefficient A, and the first coefficient A satisfies: A=M(α+1), or A=M / (1-β), or A=M / (α+1), or A=M(1-β), M>0.

[0229] Based on the scheme provided in the embodiments of the present application, by amplitude modulating the signal according to spectrum expansion or compression, the amplitude of the modulation signal can be more matched to the bandwidth of the transmission of the modulation signal, the error code performance of signal transmission can be improved, and thus the communication performance can be improved.

[0230] In some possible implementation ways, the first coefficient A satisfies: A=α+1, or A=1 / (1-β), or A=1 / (α+1), or A=1-β.

[0231] Specifically, when the bandwidth is expanded, the first coefficient A can satisfy: A=α+1, or A=1 / (1-β); when the bandwidth is compressed, the first coefficient A can satisfy: A=1 / (α+1), or A=1-β.

[0232] S1103, sending the second modulation signal.

[0233] Specifically, after obtaining the second modulation signal, the sending end of the signal can send the second modulation signal to the receiving end of the signal.

[0234] In some possible implementation ways, the sending of the second modulation signal includes: any two adjacent second modulation signals in the time domain have a time interval.

[0235] In some possible implementation manners, the time interval is greater than or equal to T / 2, and T is a transmission period of the second modulation signal in the time domain.

[0236] For example, one half of any two adjacent and orthogonal second modulation signals in the time domain is delayed by T / 2, so that the transmission of any two adjacent second modulation signals in the time domain has a time interval.

[0237] For example, the transmission mode of any two adjacent second modulation signals in the time domain is set to be equivalent to the signal transmission mode of OQAM.

[0238] Based on the scheme provided in the embodiments of the present application, by transmitting any two adjacent second modulation signals in the time domain with a time interval, and superimposing the non-peak of the waveform of another second modulation signal on the peak of the waveform of one of the second modulation signals in the time domain, the PAPR can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

[0239] In some possible implementation manners, transmitting the second modulation signal comprises: transmitting the second modulation signal and a pilot symbol, the second modulation signal and the pilot symbol are located in a same time unit, the pilot symbol comprises a frequency domain sequence that is not subjected to time domain processing, and a bandwidth for transmitting the pilot symbol is the same as a bandwidth for transmitting the second modulation signal.

[0240] For example, transmitting the second modulation signal comprises: transmitting the second modulation signal and a pilot symbol in a same time unit (for example, a same radio frame), the pilot symbol comprises a frequency domain pilot signal, for example, a Zadoff-Chu sequence (also referred to as a ZC sequence) or an m sequence when the modulation signal is a QPSK signal. The second modulation signal comprises the single carrier signal subjected to bandwidth expansion / compression, and the pilot symbol comprises a signal that is not subjected to the bandwidth expansion / compression (that is, the pilot symbol represents a signal that is directly mapped to a bandwidth after bandwidth expansion / compression, without being subjected to discrete fourier transform (DFT) and bandwidth expansion / compression operations as the second modulation signal, and the bandwidth after expansion / compression is used to transmit the second modulation signal and the pilot symbol).

[0241] In some possible implementation manners, the frequency domain sequence comprises a constant modulus sequence.

[0242] The constant modulus sequence is a sequence whose modulus of a value of the sequence is constant, and the amplitude of the constant modulus sequence is constant, and the graph of the constant modulus sequence can be regarded as a unit circle.

[0243] For example, the frequency domain sequence comprises a Zadoff-Chu sequence (ZC sequence) or an m sequence.

[0244] In the prior art, the generated ZC sequence can be mapped to the subcarriers of the transmitted pilot symbol after DFT (for example, the ZC sequence is subjected to DFT processing, and then the ZC sequence subjected to DFT processing is subjected to spectrum expansion / compression according to the expansion / compression of the transmission bandwidth, and the DFT processing and spectrum expansion / compression of the ZC sequence can be the same as the DFT processing and spectrum expansion / compression of the PAM signal), or the generated ZC sequence can be directly mapped to the subcarriers of the transmitted pilot symbol without time domain processing (for example, without DFT processing). When the generated ZC sequence is directly mapped to the subcarriers of the transmitted pilot symbol without DFT, since the modulation of the second modulation signal includes the expansion / compression of the bandwidth, and the pilot symbol corresponding to the second modulation signal includes no bandwidth expansion / compression, the energy of the second modulation signal subjected to amplitude modulation according to the first coefficient A can be more consistent with the energy of the corresponding pilot symbol.

[0245] It can be understood that the first coefficient A can satisfy A = a + 1 or A = 1 / (1 - b) when the bandwidth is expanded, and the first coefficient A can satisfy A = 1 / (a + 1) or A = 1 - b when the bandwidth is compressed.

[0246] Based on the scheme provided in the embodiments of the present application, the signal is subjected to amplitude modulation by the first coefficient A, so that the energy of the second modulation signal obtained by modulation is more consistent with the energy of the pilot symbol, the performance of correct demodulation of the signal is improved, and thus the communication performance can be improved.

[0247] In some possible implementation manners, the second modulation signal can satisfy the following condition:

[0248] Wherein, the i represents the index of the second modulation signal, the d(i) represents the second modulation signal, the C represents a normalization coefficient, the f(i) represents a rotation phase value for modulating the phase of the first modulation signal, the PAM_signal represents the first modulation signal, and the Com_Phase_Rot represents a common rotation phase value of the second modulation signal.

[0249] Specifically, the modulation of the first modulation signal PAM_signal according to the second modulation manner can include: modulating the amplitude of the first modulation signal according to a normalization coefficient C, the normalization coefficient C can include a unit power P of a constellation diagram of the first modulation manner, and the normalization coefficient C can also include the first coefficient A; and modulating the phase of the first modulation signal according to a rotation phase value f(i) and / or a common rotation phase value Com_Phase_Rot.

[0250] The common rotation phase value is a value for performing phase rotation on all first modulated signals. It is understood that Com_Phase_Rot can take any value, or Com_Phase_Rot can take 0, or Com_Phase_Rot can take a fixed value that facilitates the operation of the communication system. This embodiment of the present application does not limit this.

[0251] In some possible implementations, the value B of the PAM_signal can represent the energy level corresponding to the first modulated signal, and the value B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

[0252] In some possible implementations, the Com_Phase_Rot satisfies: Com_Phase_Rot=e jθ , where θ=aπ / 4, and a is a number greater than or equal to 0.

[0253] For example, Com_Phase_Rot=e jπ / 2 , or, Com_Phase_Rot = e jπ / 4 , or, Com_Phase_Rot = e jπ / 8 , or, Com_Phase_Rot = e jπ / 16 .

[0254] In some possible implementations, f(i) satisfies: f(i) = 0, or f(i) = ni, or f(i) = -ni, or f(i) = n(i mod 4y+2), or f(i) = -n(i mod 4y+2), or f(i) = n(i mod 4y), or f(i) = -n(i mod 4y), where y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents the remainder function.

[0255] In some possible implementations, the normalization coefficient C satisfies: Any of, or Any of, or Any one of .

[0256] It can be understood that the value of the normalization coefficient C can be the unit power P of the constellation diagram of the first modulation mode for modulating the signal to be modulated.

[0257] In some possible implementation manners, the first modulation signal is phase modulated according to the first modulation mode, and the obtained first modulation signal can include a QAM signal. When the QAM signal is modulated according to the second modulation mode, f(i) can be taken as 0, and Com_Phase_Rot can be taken as e 0 .

[0258] For example, when the QAM signal is a 4QAM signal, f(i) can be taken as The second modulation signal satisfies: Or,

[0259] Correspondingly, the result of separating the second modulation signal satisfies:

[0260] And Or, And

[0261] wherein b(i') represents the first modulation signal corresponding to the to-be-modulated signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the first modulation signal corresponding to the to-be-modulated signal satisfy any one of the following conditions, or when i' satisfies any one of the following conditions: i' = 2i, or i' = 2i+1, the value of the energy level corresponding to the 4QAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are bits of the to-be-modulated signal, and 2i and 2i+1 are the index i' of the bits of the to-be-modulated signal carried by the second modulation signal. The bits of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 4QAM signal can be any one of {1; -1}.

[0262] For example, when the second modulation signal is a 4QAM signal, the information carried by the second modulation signal with the index 0 includes the bits of the to-be-modulated signals with the indexes 0 and 1; and the information carried by the second modulation signal with the index 1 includes the bits of the to-be-modulated signals with the indexes 2 and 3.

[0263] For example, when the QAM signal is a 16QAM signal, f(i) can be taken as The second modulation signal satisfies: Or, Or, Or, Or, Or, Or, Or, Correspondingly, the result of separating the second modulation signal satisfies: And or, and or, and or, and or, and or, and or, and or, and

[0264] In which, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following items, or in other words, when i' satisfies any of the following items: i'=4i, or i'=4i+1, or i'=4i+2, or i'=4i+3, the value of the energy level corresponding to the 16QAM signal satisfies (1-2b(4i)), (1-2b(4i+1)), (1-2b(4i+2)) or (1-2b(4i+3)), b(4i), b(4i+1), b(4i+2) and b(4i+3) are the bits of the signal to be modulated, and 4i, 4i+1, 4i+2 and 4i+3 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the energy level corresponding to the 16QAM signal can be any one of {1; -1; 3; -3}.

[0265] It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

[0266] Wherein, F represents the mapping of the signal to be modulated. The real part of the second modulated signal is first mapped to the signal to be modulated with index 4i, and then mapped to the signal to be modulated with index 4i+2. The order of F(4i) and F(4i+2) in the real part of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the signal to be modulated with index 4i+2, and then mapped to the signal to be modulated with index 4i. Similarly, the order of F(4i+1) and F(4i+3) in the imaginary part of the second modulated signal can be arbitrarily swapped.

[0267] For example, when the second modulation signal is a 16QAM signal, the second modulation signal with index 0 carries information including bits of the to-be-modulated signals with index 0, index 1, index 2 and index 3; the second modulation signal with index 1 carries information including bits of the to-be-modulated signals with index 4, index 5, index 6 and index 7.

[0268] When the QAM signal is a 64QAM signal, the second modulation signal is taken as The second modulation signal satisfies: Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Correspondingly, the result of separating the second modulation signal satisfies: And Or, And Or, And Or, And Or, And Or, And Or, And Or, And Or, And Or, And Or, And Or, And

[0269] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy any one of the following, or when i' satisfies any one of the following: i' = 6i, or i' = 6i+1, or i' = 6i+2, or i' = 6i+3, or i' = 6i+4, or i' = 6i+5, the value of the energy level corresponding to the 64QAM signal satisfies (1-2b(6i)), (1-2b(6i+1)), (1-2b(6i+2)), (1-2b(6i+3)), (1-2b(6i+4)) or (1-2b(6i+5)), b(6i), b(6i+1), b(6i+2), b(6i+3), b(6i+4) and b(6i+5) are the bits of the to-be-modulated signal, and 6i, 6i+1, 6i+2, 6i+3, 6i+4 and 6i+5 are the index i' of the bits of the to-be-modulated signal carried by the second modulation signal. The bits of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 64QAM signal can be any one of {1; -1; 3; -3; 5; -5; 7; -7}.

[0270] It can be understood that the to-be-modulated signal is modulated by the above modulation method to obtain the second modulation signal, and the mapping order of the bits of the to-be-modulated signal in the second modulation signal can be any order, which is not limited by the embodiments of the present application. For example, the obtained second modulation signal satisfies:

[0271] wherein F represents the mapping of the to-be-modulated signal, the real part of the second modulation signal first maps the to-be-modulated signal with the index of 6i, then maps the to-be-modulated signal with the index of 6i+2, and then maps the to-be-modulated signal with the index of 6i+4. The order between F(6i), F(6i+2) and F(6i+4) in the real part of the second modulation signal can also be arbitrarily exchanged, so that the real part of the second modulation signal first maps the to-be-modulated signal with the index of 6i+4, then maps the to-be-modulated signal with the index of 6i, and then maps the to-be-modulated signal with the index of 6i+2, or other arbitrary order. Similarly, the order between F(6i+1), F(6i+3) and F(6i+5) in the imaginary part of the second modulation signal can also be arbitrarily exchanged.

[0272] For example, when the second modulation signal is a 64QAM signal, the information carried by the second modulation signal with the index of 0 includes the bits of the to-be-modulated signal with the index of 0, the index of 1, the index of 2, the index of 3, the index of 4 and the index of 5; the information carried by the second modulation signal with the index of 1 includes the bits of the to-be-modulated signal with the index of 6, the index of 7, the index of 8, the index of 9, the index of 10 and the index of 11.

[0273] In some possible implementation manners, the phase modulation is performed on the to-be-modulated signal according to the first modulation manner, and the obtained first modulation signal can include a BPSK signal. When the BPSK signal is modulated according to the second modulation manner, f(i) can be taken as i mod 2, C can be taken as 1, and Com_Phase_Rot can be taken as e jπ / 4 , and the second modulation signal satisfies:

[0274] In some possible implementation manners, the phase modulation is performed on the to-be-modulated signal according to the first modulation manner, and the obtained first modulation signal can include a PAM signal. When the PAM signal is modulated according to the second modulation manner, f(i) can be taken as i, and Com_Phase_Rot can be taken as e jπ / 4 , or f(i) can be taken as i, and Com_Phase_Rot can be taken as e 0 .

[0275] For example, when the PAM signal is modulated according to the second modulation manner, f(i) is taken as i, and Com_Phase_Rot is taken as e jπ / 4 .

[0276] For example, when the PAM signal is a 2PAM signal, C is taken as 1, and the second modulation signal satisfies: or

[0277] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy, that is, when i' satisfies: i' = i, the value of the energy level corresponding to the 2PAM signal satisfies (1-2b(i)), b(i) is the bit of the to-be-modulated signal, and i is equal to the index i' of the bit of the to-be-modulated signal carried by the second modulation signal. The bit of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 2PAM signal can be any one of {1; -1}.

[0278] For example, when the PAM signal is a 4PAM signal, C is taken as , and the second modulation signal satisfies: or or or

[0279] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy any one of the following, or when i' satisfies any one of the following: i' = 2i, or i' = 2i + 1, the energy level corresponding to the 4PAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are bits of the to-be-modulated signal, and 2i and 2i+1 are the index i' of the bits of the to-be-modulated signal carried by the second modulation signal. The bits of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 4PAM signal can be any one of {1; -1; 3; -3}.

[0280] It can be understood that the to-be-modulated signal is modulated by the above modulation method to obtain a second modulation signal, and the mapping order of the bits of the to-be-modulated signal in the second modulation signal can be any order, which is not limited by the embodiments of the present application. For example, the obtained second modulation signal satisfies:

[0281] wherein F represents the mapping of the to-be-modulated signal, the real part of the second modulation signal first maps the to-be-modulated signal with the index 2i, and then maps the to-be-modulated signal with the index 2i+1. The order between F(2i) and F(2i+1) in the real part of the second modulation signal can also be arbitrarily exchanged, so that the real part of the second modulation signal first maps the to-be-modulated signal with the index 2i+1, and then maps the to-be-modulated signal with the index 2i.

[0282] For example, when the second modulation signal is a 4PAM signal, the information carried by the second modulation signal with the index 0 includes the bits of the to-be-modulated signal with the index 0 and the index 1; the information carried by the second modulation signal with the index 1 includes the bits of the to-be-modulated signal with the index 2 and the index 3.

[0283] For example, when the PAM signal is an 8PAM signal, F(2i) = 2i and F(2i+1) = 2i+1 are taken. The second modulation signal satisfies: Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Or,

[0284] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy any one of the following conditions, or when i' satisfies any one of the following conditions: i' = 3i, or i' = 3i + 1, or i' = 3i + 2, the energy level corresponding to the 8PAM signal satisfies (1-2b(3i)), (1-2b(3i+1)) or (1-2b(3i+2)), b(3i), b(3i+1) and b(3i+2) are bits of the to-be-modulated signal, and 3i, 3i+1 and 3i+2 are the index i' of the bits of the to-be-modulated signal carried by the second modulation signal. The bits of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 8PAM signal can be any one of {1; -1; 3; -3; 5; -5; 7; -7}.

[0285] It can be understood that the to-be-modulated signal is modulated by the above modulation manner to obtain the second modulation signal, and the mapping order of the bits of the to-be-modulated signal in the second modulation signal can be any order, which is not limited by the embodiments of the application. For example, the obtained second modulation signal satisfies:

[0286] wherein F represents the mapping of the to-be-modulated signal, the real part of the second modulation signal is mapped to the to-be-modulated signal with the index of 3i first, then to the to-be-modulated signal with the index of 3i+1, and then to the to-be-modulated signal with the index of 3i+2. The order among F(3i), F(3i+1) and F(3i+2) of the second modulation signal can also be arbitrarily exchanged, so that the real part of the second modulation signal is mapped to the to-be-modulated signal with the index of 3i+2 first, then to the to-be-modulated signal with the index of 3i+1, and then to the to-be-modulated signal with the index of 3i.

[0287] For example, the PAM signal is modulated according to the second modulation manner, f(i) = i is taken, and Com_Phase_Rot = e 0 .

[0288] For example, when the PAM signal is a 2PAM signal, C = 1 is taken, and the second modulation signal satisfies: or,

[0289] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy, or in other words, when i' satisfies: i'=i, the value of the energy level corresponding to the 2PAM signal satisfies (1-2b(i)), b(i) is the bit of the to-be-modulated signal, and i is equal to the index i' of the bit of the to-be-modulated signal carried by the second modulation signal. The bit of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 2PAM signal can be any one of {1; -1}.

[0290] For example, when the PAM signal is a 4PAM signal, the value of the energy level corresponding to the 4PAM signal is taken as The second modulation signal satisfies: Or, Or, Or,

[0291] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy any one of the following, or in other words, when i' satisfies any one of the following: i'=2i, or, i'=2i+1, the energy level corresponding to the 4PAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are the bits of the to-be-modulated signal, and 2i and 2i+1 are the index i' of the bit of the to-be-modulated signal carried by the second modulation signal. The bit of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 4PAM signal can be any one of {1; -1; 3; -3}.

[0292] It can be understood that the to-be-modulated signal is modulated by the above-mentioned modulation mode to obtain the second modulation signal, and the mapping order of the bits of the to-be-modulated signal in the second modulation signal can be any order, which is not limited in the embodiments of the present application. For example, the obtained second modulation signal satisfies:

[0293] wherein F represents the mapping of the to-be-modulated signal, the real part of the second modulation signal first maps the to-be-modulated signal with the index 2i, and then maps the to-be-modulated signal with the index 2i+1. The order between F(2i) and F(2i+1) in the real part of the second modulation signal can also be arbitrarily exchanged, so that the real part of the second modulation signal first maps the to-be-modulated signal with the index 2i+1, and then maps the to-be-modulated signal with the index 2i.

[0294] For example, when the second modulation signal is a 4PAM signal, the second modulation signal with index 0 carries information of the bits of the to-be-modulated signal with index 0 and index 1; and the second modulation signal with index 1 carries information of the bits of the to-be-modulated signal with index 2 and index 3.

[0295] For example, when the PAM signal is an 8PAM signal, the second modulation signal satisfies: The second modulation signal satisfies: Or, Or, Or, Or, Or, Or, Or, Or, Or, Or, Or,

[0296] wherein b(i') represents the to-be-modulated signal corresponding to the first modulation signal, and i' represents the index of the to-be-modulated signal; when the index i of the first modulation signal and the index i' of the to-be-modulated signal corresponding to the first modulation signal satisfy any one of the following conditions, or in other words, when i' satisfies any one of the following conditions: i' = 3i, or i' = 3i+1, or i' = 3i+2, the energy level corresponding to the 8PAM signal satisfies (1-2b(3i)), (1-2b(3i+1)) or (1-2b(3i+2)), b(3i), b(3i+1) and b(3i+2) are bits of the to-be-modulated signal, and 3i, 3i+1 and 3i+2 are the index i' of the bits of the to-be-modulated signal carried by the second modulation signal. The bits of the to-be-modulated signal can be '0' or '1', and the value of the energy level corresponding to the 8PAM signal can be any one of {1; -1; 3; -3; 5; -5; 7; -7}.

[0297] It can be understood that the to-be-modulated signal is modulated by the above modulation method to obtain the second modulation signal, and the mapping order of the bits of the to-be-modulated signal to the second modulation signal can be any order, which is not limited by the embodiments of the present application. For example, the obtained second modulation signal satisfies:

[0298] F (3i), F (3i+1), F (3i+2), wherein F represents mapping of the to-be-modulated signal, the real part of the second modulated signal is mapped to the to-be-modulated signal with index 3i first, then to the to-be-modulated signal with index 3i+1, and then to the to-be-modulated signal with index 3i+2. The order of F (3i), F (3i+1), F (3i+2) in the second modulated signal can also be exchanged at will, so that the real part of the second modulated signal is mapped to the to-be-modulated signal with index 3i+2 first, then to the to-be-modulated signal with index 3i+1, and then to the to-be-modulated signal with index 3i.

[0299] Based on the scheme provided in the embodiments of the present application, the modulated signal can carry 2 or more than 2 bits, and the signal carrying more than 2 bits can improve the spectral efficiency.

[0300] The above introduces a signal sending method, and the following introduces a signal receiving method. The signal receiving method can be executed by a signal receiving end. For example, the signal receiving end can be a terminal device, which can receive a modulated signal sent by a network device / another terminal device through the method; or the signal receiving end can be a network device, which can receive a modulated signal sent by a terminal device / another network device through the method. The embodiments of the present application do not limit this.

[0301] A signal receiving method, the method comprising: receiving a second modulated signal, and demodulating the second modulated signal according to a first coefficient A.

[0302] Specifically, after receiving the second modulated signal, the signal receiving end can demodulate the second modulated signal according to the first coefficient A to obtain the information carried by the modulated signal.

[0303] For example, the signal receiving end needs to calculate the distance from the constellation point corresponding to the second modulated signal to the origin of the constellation diagram when demodulating the second modulated signal, and the value of the distance from the constellation point of the second modulated signal modulated according to the first coefficient A to the origin of the constellation diagram and the first coefficient A have a correlation relationship.

[0304] Based on the scheme provided in the embodiments of the present application, the modulated signal is demodulated according to the first coefficient, so that the demodulation result of the signal can be more consistent with the to-be-modulated signal before modulation, a more accurate demodulation result is obtained, the signal is better recovered, and the error code performance is improved.

[0305] Optionally, before the network device and the terminal device communicate through modulated symbols, the network device and the terminal device need to determine a modulation mode. The determined modulation mode can enable the receiving terminal to correctly parse the modulated symbols sent by the sending terminal after the modulated symbols are modulated by the determined modulation mode. The determination of the modulation mode can include determining the modulation mode based on the modulation parameters reported by the terminal device to the network device, or determining the modulation mode without the modulation parameters reported by the terminal device to the network device, or modulating according to a default modulation mode by the network device and / or the terminal device. The default modulation mode can be agreed by a protocol or can be previously informed to the terminal device / network device by the network device / terminal device. The embodiments of the present application do not limit this.

[0306] It can be understood that the receiving terminal (for example, the terminal / network device receiving the modulated signal sent by the network / terminal device) can demodulate the signal according to the modulation mode after receiving the signal sent by the modulation mode, and obtain the information carried by the signal.

[0307] For example, the modulation mode can be determined by the method 1200 for determining the modulation mode. FIG. 12 is a schematic diagram of a method 1200 for determining the modulation mode according to an embodiment of the present application. As shown in FIG. 12, the method 1200 can include the following steps:

[0308] S1201, the network device sends first information to the terminal device according to its own capability configuration, or according to its own capability configuration and the modulation parameters of the terminal device. The first information can be used to indicate whether the network device supports OQAM or the condition parameters of the supported OQAM, and the like.

[0309] Specifically, the network device can configure whether the terminal device supports OQAM or the condition parameters of the supported OQAM according to its own capability configuration, or according to its own capability configuration and the modulation parameters of the terminal device reported by the terminal device to the network device, and send the first information to the terminal device. The first information can be used to indicate whether the network device supports OQAM or the condition parameters of the supported OQAM, and the like.

[0310] Optionally, the modulation parameters of the terminal device can be sent by the terminal device to the network device, or the modulation parameters of the terminal device can be determined by the network device according to other information sent by the terminal device, and the embodiments of the present application do not limit this.

[0311] For example, before the step S1201, the terminal device can send the modulation parameters to the network device.

[0312] S1202, the network device communicates with the terminal device.

[0313] Specifically, the network device can schedule a communication resource for the terminal device to communicate.

[0314] Optionally, before the step S1202, the method can further include that the terminal device receives transmission resource indication information, the transmission resource indication information can be used to indicate a time-frequency resource, and the terminal device can receive the transmission data stream on the time-frequency resource. By indicating the time-frequency resource of the network device transmitting the transmission data stream through the transmission resource indication information, the terminal device can receive the transmission data stream on the time-frequency resource.

[0315] S1203, determining a modulation mode according to the communication parameter and / or information whether OQAM is supported.

[0316] Specifically, after the network device communicates with the terminal device, the network device can determine the modulation mode according to the communication parameter and / or information whether OQAM is supported, and send second information to the terminal device, the second information being used to indicate the modulation mode determined by the network device.

[0317] It can be understood that in the step S1203, after the network device communicates with the terminal device, the terminal device can also determine the modulation mode according to the communication parameter and / or information whether OQAM is supported, and send second information to the network device, the second information being used to indicate the modulation mode determined by the terminal device (not shown in FIG. 12). The embodiments of the present application do not limit this.

[0318] S1204, communicating according to the determined modulation mode.

[0319] Based on the scheme provided in the embodiments of the present application, the network device and the terminal device can flexibly determine the modulation mode according to the capability of the terminal device and / or the network device or the actual communication situation (for example, communication resource, channel quality, etc.), and communicate according to the determined modulation mode.

[0320] It can be understood that the modulation mode determined in the method 1200 for determining the modulation mode can include the method 1100 for signal sending or other modulation modes, and the embodiments of the present application do not limit this.

[0321] The method 1100 for signal sending and the method 1200 for determining the modulation mode of the network device and the terminal device provided in the embodiments of the present application are described in detail above in combination with FIG. 11 and FIG. 12, and the communication apparatus provided in the embodiments of the present application is introduced below in combination with FIG. 13 and FIG. 14.

[0322] FIG. 13 is a schematic block diagram of a communication apparatus provided in an embodiment of the present application. As shown in FIG. 13, the apparatus 1300 can be a terminal device or a network device, or a component (for example, a unit, a module, a chip or a chip system) configured in a terminal device or a network device. The apparatus 1300 can include a transceiver unit 1310 and a processing unit 1320.

[0323] The transceiver unit 1310 can be configured to perform the transceiving-related operations performed by the terminal device or the network device in the method embodiments. For example, the transceiver unit 1310 can be configured to transmit or receive a second modulated signal, or can be configured to transmit or receive a real part signal and / or an imaginary part signal, or can be configured to transmit or receive a pilot symbol; or can be configured to transmit or receive the first information or the second information.

[0324] The processing unit 1320 can be configured to perform the processing-related operations performed by the terminal device or the network device in the method embodiments. For example, the processing unit 1320 can be configured to modulate a to-be-modulated signal according to a first modulation manner; or can be configured to modulate a first modulated signal according to a second modulation manner; or can be configured to demodulate a second modulated signal according to a first coefficient A.

[0325] FIG. 14 is a schematic block diagram of a communication apparatus provided in an embodiment of the present application. As shown in FIG. 14, the apparatus 1400 can include a processor 1410 and a transceiver 1430. The apparatus 1400 can further include a memory 1420 having one or more programs stored therein, which, when executed by the processor 1410, cause the method of signal transmission or signal reception as described in any possible implementation manner to be performed.

[0326] For example, the apparatus 1400 can be configured to perform the method 1100, the method 1200 and the like.

[0327] It can be understood that, in the apparatus of FIG. 14, the processor 1410 can include one or more processors; the memory 1420 can include one or more memories; and the transceiver 1430 can include one or more transceivers. The embodiments of the present application do not make any limitation in this regard.

[0328] The embodiments of the present application further provide a chip, which includes a processor and a communication interface. The communication interface is configured to receive a signal and transmit the signal to the processor. The processor processes the signal, so that the method of signal transmission or signal reception as described in any possible implementation manner is performed.

[0329] The embodiment further provides a computer storage medium, which stores computer instructions. When the computer instructions run on an electronic device, the electronic device executes the related method steps to implement the signal sending or signal receiving method in the above embodiment.

[0330] The embodiment further provides a computer program product. When the computer program product runs on a computer, the computer executes the related steps to implement the signal sending or signal receiving method in the above embodiment.

[0331] In addition, the embodiment of the present application further provides an apparatus, which can be a chip, a component or a module. The apparatus can include a processor and a memory connected to each other. When the apparatus runs, the processor can execute the computer-executable instructions stored in the memory, so that the chip executes the signal sending or signal receiving method in the above method embodiments.

[0332] The electronic device, the computer storage medium, the computer program product or the chip provided by the embodiment are used to execute the corresponding method provided above, and thus the beneficial effects of the electronic device, the computer storage medium, the computer program product or the chip can refer to the beneficial effects of the corresponding method provided above, which will not be described here.

[0333] Those skilled in the art can understand that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but the implementation should not be considered beyond the scope of the present application.

[0334] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, apparatus and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0335] In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely schematic, for example, the division of the units is merely a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0336] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0337] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0338] If the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application which essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0339] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of signaling, characterized by, The method comprises: modulating a to-be-modulated signal according to a first modulation mode to obtain a first modulated signal, the first modulation mode comprising modulating an amplitude of the to-be-modulated signal; modulating a plurality of the first modulated signals according to a second modulation mode to obtain m second modulated signals, wherein the second modulation mode comprises phase modulation, the second modulated signals are complex signals, m is an integer greater than or equal to 2, and any two adjacent second modulated signals in the time domain satisfy Q = n * π / 2 or Q = - n * π / 2, wherein n is an integer greater than or equal to 1; sending the second modulated signals.

2. The method of claim 1, wherein, The method further comprises: modulating the amplitude of the first modulated signal according to a first coefficient A, wherein the first coefficient A is related to at least one of the following: a roll-off factor α or a spectral spreading factor β.

3. The method of claim 2, wherein, The method further comprises: sending the second modulated signals and pilot symbols in the same time unit, wherein the pilot symbols comprise a frequency domain sequence that has not been processed in the time domain, the bandwidth for sending the pilot symbols is the same as the bandwidth for sending the second modulated signals.

4. The method of claim 3, wherein: the frequency domain sequence comprises a constant modulus sequence.

5. The method of any one of claims 2-4, wherein: the first coefficient A satisfies A = α + 1, A = 1 / (1 - β), A = 1 / (α + 1), or A = 1 - β.

6. The method according to any one of claims 1-5, characterized in that, the phase modulation comprises at least one of the following: modulating the first modulated signal according to a common phase rotation; or modulating the first modulated signal according to a rotation phase value.

7. The method according to any one of claims 1 to 6, characterized in that, The second modulated signal satisfies the following condition: wherein i represents the index of the second modulated signal, d(i) represents the second modulated signal, C represents a normalization coefficient, f(i) represents a rotation phase value, PAM_signal represents the first modulated signal, and Com_Phase_Rot represents a common rotation phase value.

8. The method of claim 7, wherein: the value B of PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of the following: B ∈ {1; -1; 3; -3; …; (2x - 1); -(2x - 1)}, wherein x is an integer greater than or equal to 1.

9. The method of claim 7 or 8, wherein: The Com_Phase_Rot satisfies: Com_Phase_Rot = e jθ , and θ = aπ / 4, where a is a number greater than or equal to 0.

10. The method of any one of claims 7-9, wherein: the f(i) satisfies any one of the following: f(i) = n, or, f(i) = -n, or, f(i) = n(i mod 4y+2), or, f(i) = -n(i mod 4y+2), or, f(i) = n(i mod 4y), or, f(i) = -n(i mod 4y), the y is an integer greater than or equal to 0, and the mod represents a remainder function; The second modulation mode further comprises modulating the amplitude of the first modulation signal according to the normalization coefficient, the normalization coefficient C satisfying: any one of the preceding claims, or Any one of the preceding claims.

11. The method of claim 7, wherein, b(i') represents a to-be-modulated signal corresponding to the first modulated signal, and i' represents an index of the to-be-modulated signal; When i' satisfies: i' = i, the second modulation signal satisfies the following condition: or or, When i' satisfies either of the following: i' = 2i, or, i' = 2i + 1, the second modulation signal satisfies the following condition: or or or or, When i' satisfies any one of the following: i' = 3i, or, i' = 3i + 1, or, i' = 3i + 2, the second modulation signal satisfies the following condition: or or or or or or or or or or or 12. A communications device, characterized by The apparatus comprises: a processing unit configured to modulate a to-be-modulated signal according to a first modulation manner to obtain a first modulated signal, the first modulation manner comprising modulating an amplitude of the to-be-modulated signal; the processing unit is further configured to modulate a plurality of the first modulated signals according to a second modulation manner to obtain m second modulated signals, wherein the second modulation manner comprises phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and any two adjacent second modulated signals in the time domain satisfy: Q = n*π / 2, or, Q = -n*π / 2, n is an integer greater than or equal to 1; a transceiver configured to transmit the second modulated signal.

13. The apparatus of claim 12, wherein, The modulation of the plurality of first modulated signals according to the second modulation manner to obtain the m second modulated signals further comprises: modulating the amplitude of the first modulated signal according to a first coefficient A, wherein the first coefficient A is related to at least any one of the following: a roll-off factor a, or a spectrum spreading factor β.

14. The apparatus of claim 13, wherein, The transmission of the second modulated signal comprises: transmitting the second modulated signal and a pilot symbol in the same time unit, the pilot symbol comprising a frequency domain sequence that has not been processed in the time domain, and the bandwidth for transmitting the pilot symbol is the same as the bandwidth for transmitting the second modulated signal.

15. The apparatus of claim 14, wherein, the frequency domain sequence comprises a constant modulus sequence.

16. The apparatus of any one of claims 13-15, wherein, the first coefficient A satisfies: A = a + 1, or, A = 1 / (1-β), or, A = 1 / (a + 1), or, A = 1 / β. 1-β。 17. The apparatus of any one of claims 12-16, wherein, the phase modulation comprises at least any one of the following: modulating the first modulated signal according to a common phase rotation; or modulating the first modulated signal according to a rotation phase value.

18. The apparatus of any one of claims 12-17, wherein, The second modulated signal satisfies the following condition: wherein i represents an index of the second modulated signal, d(i) represents the second modulated signal, C represents a normalization coefficient, f(i) represents a rotation phase value, PAM_signal represents the first modulated signal, and Com_Phase_Rot represents a common rotation phase value.

19. The apparatus of claim 18, wherein, The value B of the PAM_signal represents an energy level corresponding to the first modulation signal, and the B satisfies any one of the following: B∈{1; -1; 3; -3;...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

20. The apparatus of claim 18 or 19, wherein, The Com_Phase_Rot satisfies: Com_Phase_Rot = e jθ , and θ = aπ / 4, where a is a number greater than or equal to 0.

21. The apparatus of any one of claims 18-20, wherein, The f(i) satisfies any one of the following: f(i) = n(i mod 4y+2), or f(i) = -n(i mod 4y+2), or f(i) = n(i mod 4y), or f(i) = -n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function. The second modulation mode further comprises modulating the amplitude of the first modulation signal according to the normalization coefficient, the normalization coefficient C satisfying: any one of the preceding claims, or 22. The apparatus of claim 18, wherein, b(i') represents a to-be-modulated signal corresponding to the first modulation signal, and i' represents an index of the to-be-modulated signal. or, When i' satisfies: i' = i, the second modulated signal satisfies the following condition: or or, When i' satisfies either of the following: i' = 2i, or, i' = 2i + 1, the second modulation signal satisfies the following condition: or or or 23. The apparatus of any one of claims 12-22, wherein, When i' satisfies any one of the following: i' = 3i, or, i' = 3i + 1, or, i' = 3i + 2, the second modulation signal satisfies the following condition: or or or or or or or or or or or The transceiver unit is a transceiver, and / or the processing unit is a processor. comprising:

24. A communications device, characterized by a processor configured to execute computer instructions stored in a memory, so that the apparatus performs the method of any one of claims 1-11. The apparatus further comprises the memory.

25. The apparatus of claim 24, wherein, The apparatus further comprises a communication interface coupled to the processor, 26. The apparatus of claim 24 or 25, wherein, The communication interface is configured to input and / or output information. The apparatus is a chip.

27. The apparatus of any one of claims 24-26, wherein, When the computer program in the computer program product is executed by the communication apparatus, the method of any one of claims 1-11 is implemented.

28. A computer program product, characterised in that, The storage medium stores a computer program or instructions, and when the computer program or instructions are executed by the communication apparatus, the method of any one of claims 1-11 is implemented.

29. A computer-readable storage medium, characterized in that, ​

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