CN117639998A - Signal processing method and device - Google Patents

Signal processing method and device Download PDF

Info

Publication number
CN117639998A
CN117639998A CN202211415615.1A CN202211415615A CN117639998A CN 117639998 A CN117639998 A CN 117639998A CN 202211415615 A CN202211415615 A CN 202211415615A CN 117639998 A CN117639998 A CN 117639998A
Authority
CN
China
Prior art keywords
symbol
frequency
phase
signal
fsk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211415615.1A
Other languages
Chinese (zh)
Inventor
李强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2023/114214 priority Critical patent/WO2024041522A1/en
Publication of CN117639998A publication Critical patent/CN117639998A/en
Pending legal-status Critical Current

Links

Abstract

The embodiment of the application provides a method and a device for signal processing, wherein the method comprises the following steps: the transmitting device transmits a first symbol; modulating the phase of a second symbol according to a first phase, a second frequency and a second duration, wherein the second symbol is the next symbol of the first symbol, the first phase is the phase when the first symbol ends, the second frequency is the transmission frequency used by the second symbol, and the second duration is the duration of the cyclic prefix of the second symbol; the modulated second symbol is transmitted using a second frequency, the phase between the modulated second symbol and the first symbol being continuous. That is, before the sending device sends the second symbol, the sending device may modulate the phase of the second symbol, so that the phase of the second symbol is changed, so that the phase between the first symbol and the second symbol is continuous, phase jump is avoided, and interference generated by the signal on the signal transmitted on the adjacent frequency band in the transmission process is reduced.

Description

Signal processing method and device
The present application claims priority from the chinese patent application filed at 26, 08, 2022, filed with the chinese national intellectual property agency under application number 202211033204.6, entitled "a method for reducing out-of-band energy leakage", the entire contents of which are incorporated herein by reference.
Technical Field
Embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for signal processing.
Background
In a wireless communication system, signals are radiated to space through an antenna in the form of electromagnetic waves. The transmitting device will typically use a pre-allocated carrier frequency for transmission of the signal prior to transmission of the signal, and the main energy of the signal should be within the allocated bandwidth. However, during the actual transmission of the signal, the frequency spectrum of the actual waveform of the signal may exceed the allocated bandwidth range, so that serious interference may be generated on the signal transmitted on the adjacent frequency band, and the transmission of the signal on the adjacent frequency band is affected.
Disclosure of Invention
The embodiment of the application provides a signal processing method and device, which can reduce interference generated by signals transmitted on adjacent frequency bands in the transmission process.
In a first aspect, a method for processing a signal is provided, which may be performed by a transmitting end device (such as a terminal device, e.g. a network device) or may also be performed by a component (such as a chip or a circuit) of the transmitting end device, which is not limited.
The method may include: transmitting a first symbol; modulating the phase of a second symbol according to a first phase, a second frequency and a second duration, wherein the second symbol is a symbol after the first symbol, the first phase is a phase when the first symbol ends, the second frequency is a transmission frequency used by the second symbol, and the second duration is the duration of a cyclic prefix of the second symbol; and transmitting a modulated second symbol by using the second frequency, wherein the phase between the modulated second symbol and the first symbol is continuous.
Based on the technical scheme, the sending end device can modulate the phase of the second symbol according to the phase of the first symbol at the end, the transmission frequency used by the second symbol and the duration of the cyclic prefix of the second symbol, so that the phase of the second symbol is changed, when the modulated second symbol is sent by using the second frequency, the phase between the modulated second symbol and the first symbol is continuous, phase jump can be avoided, and interference of signals on signals transmitted on adjacent frequency bands in the transmission process is reduced.
With reference to the first aspect, in some implementations of the first aspect, the transmitting device may determine a third phase according to the first phase, the second frequency, and the second duration; determining a modulation symbol according to the third phase; and carries the modulation symbol on a second frequency. Wherein the phase of the modulation symbol (i.e., the third phase) is equal to the phase of the modulated second symbol.
The first phase may be expressed asThe second frequency may be denoted as f n The second time period may be denoted as T cp,n The third phase may be denoted +.>Further, the modulation symbol may be expressed as +.>
With reference to the first aspect, in some implementations of the first aspect, the first phase is determined according to a second phase, a first frequency, and a first time length, the second phase is a phase of the first symbol, the first frequency is a transmission frequency used by the first symbol, and the first time length is a remaining time length of a time length of the first symbol divided by the cyclic prefix.
The second phase may be expressed asThe first frequency may be denoted as f n-1 The first duration may be denoted as T os ThenThe first phase may be denoted +.>Further, the third phase may be expressed as
With reference to the first aspect, in certain implementations of the first aspect, the first phase is the same as the second phase, which is the phase of the first symbol.
The first phase may be expressed asFurther, the third phase may be expressed as
With reference to the first aspect, in certain implementations of the first aspect, the second frequency is determined according to data currently to be transmitted.
For example, the second frequency may carry an FSK signal, and if the modulation order of the FSK signal is 2, one symbol may carry 1 bit of information. At this time, if the bits of the information to be transmitted include a sequence of "0" and "1", the transmission frequency is f 0 May represent a transmission of "0" with a transmission frequency f 1 May represent a transmission of a "1". That is, the transmitting device may determine the second frequency as f according to whether the data to be transmitted is 0 or 1 0 Or f 1 。
With reference to the first aspect, in certain implementations of the first aspect, the first symbol and the second symbol are orthogonal frequency division multiplexing, OFDM, symbols.
In a second aspect, a method for signal processing is provided, which may be performed by a transmitting end device (such as a terminal device, and also such as a network device), or may also be performed by a component (such as a chip or a circuit) of the transmitting end device, which is not limited.
The method may include: transmitting a first symbol; generating a frequency gradual change signal according to a first phase, a first frequency and a second frequency, wherein the first phase is a phase when a first symbol ends, the first frequency is a transmission frequency used by the first symbol, the second frequency is a transmission frequency used by a second symbol, and the second symbol is a symbol after the first symbol; and transmitting a third symbol, wherein the third symbol comprises the frequency gradual change signal and the second symbol, the second symbol is connected with the first symbol through the frequency gradual change signal, and the frequency between the third symbol and the first symbol is continuous.
The frequency-graded signal may be located at the position of the cyclic prefix CP of the third symbol, for example.
Based on the above technical solution, the transmitting end device may generate a frequency gradual change signal according to the phase when the first symbol ends, the transmission frequency used by the first symbol, and the transmission frequency used by the second symbol, and the transmitted third symbol includes the frequency gradual change signal and the second symbol, and the first symbol and the second symbol are connected through the frequency gradual change signal, so that the frequency of the first symbol is smoothly converted into the frequency of the third symbol, that is, the frequency is smoothly converted from the frequency of the previous symbol into the frequency of the current symbol, the frequency is kept continuous, and frequency jump is avoided, so that interference generated by the signal on the signal transmitted on the adjacent frequency band in the transmission process can be reduced.
With reference to the second aspect, in certain implementations of the second aspect, the frequency taper signal is determined according to a frequency taper sequence, the frequency taper sequence is determined according to an instantaneous frequency function and the first phase, the instantaneous frequency function is derived from a taper frequency function, and the taper frequency function is determined according to a first frequency, a second frequency, and a duration of a cyclic prefix of the second symbol.
Based on the above technical solution, the transmitting end device may determine a gradual change frequency function according to the transmission frequency used by the first symbol, the transmission frequency used by the second symbol, and the duration of the cyclic prefix of the second symbol, and obtain an instantaneous frequency function based on the gradual change frequency function, so as to determine a frequency gradual change sequence according to the instantaneous frequency function and the first phase, where the frequency gradual change sequence may be set at the position of the CP of the second symbol, so that the transmitting end device may generate a frequency gradual change signal according to the frequency gradual change sequence.
With reference to the second aspect, in some implementations of the second aspect, the first phase is determined according to a second phase, a first frequency, and a first time length, the second phase is a phase of the first symbol, the first frequency is a transmission frequency used by the first symbol, and the first time length is a remaining time length of a time length of the first symbol divided by the cyclic prefix.
The second phase may be expressed asThe first frequency may be denoted as f n-1 The first duration may be denoted as T os The first phase may be expressed as +.>
With reference to the second aspect, in some implementations of the second aspect, the first phase is the same as the second phase, which is the phase of the first symbol.
The first phase may be expressed as
With reference to the second aspect, in certain implementations of the second aspect, the gradual frequency function includes any one of: cosine function, deformation function of cosine function, hyperbolic tangent function.
With reference to the second aspect, in certain implementations of the second aspect, the first symbol and the second symbol are orthogonal frequency division multiplexing, OFDM, symbols.
In a third aspect, a method for signal processing is provided, which may be performed by a transmitting end device (such as a terminal device, and also such as a network device), or may also be performed by a component (such as a chip or a circuit) of the transmitting end device, which is not limited.
The method may include: generating a Frequency Shift Keying (FSK) signal according to a square wave signal, a first amplitude and a second amplitude, wherein the square wave signal is obtained by mapping data to be transmitted, the data to be transmitted comprises first data and second data, the first data and the second data are adjacent in transmission sequence, the first amplitude is the amplitude obtained by mapping the first data, and the second amplitude is the amplitude obtained by mapping the second data; and sending the FSK signal.
Based on the above technical scheme, the transmitting end device can generate the FSK signal according to the square wave signal, the first amplitude and the second amplitude, that is, the transmitting end device can generate the FSK signal according to the amplitude obtained by mapping two adjacent data in the transmission sequence and the square wave signal, the frequency of the FSK signal is changed smoothly, and frequency hopping of the signal can be avoided, so that interference of the signal on the signal transmitted on the adjacent frequency band in the transmission process is reduced.
With reference to the third aspect, in certain implementations of the third aspect, the FSK signal is determined according to a first phase signal, the first phase signal being integrated according to a first signal, the first signal comprising the square wave signal and a ramp signal, the ramp signal being determined according to a first amplitude, a second amplitude and a time length of the ramp signal.
Based on the above technical scheme, the transmitting end device can determine the gradual change signal according to the first amplitude, the second amplitude and the time length of the gradual change signal, so that the first signal can be determined according to the gradual change signal and the square wave signal, and the first signal is integrated to obtain the first phase signal, so that the FSK signal is determined according to the first phase signal. It can be understood that the FSK signal is generated according to a square wave signal and a gradual change signal, and the gradual change signal can be inserted between square wave signals with different amplitudes, so that signal jump is avoided, and interference of the signal on signals transmitted on adjacent frequency bands in the transmission process is reduced.
With reference to the third aspect, in certain implementations of the third aspect, the FSK signal satisfies the following equation:
wherein s is FSK (t) FSK signal at time t, v f (τ) represents a first signal, h being a constant.
With reference to the third aspect, in certain implementations of the third aspect, the square wave signal is mapped from data to be transmitted by: mapping every N bits in data to be transmitted into an amplitude according to a preset mapping table; determining a square wave signal according to the mapped amplitude; where n=log 2 M, M is the modulation order of FSK signal, N is natural number.
For example, assuming that FSK modulation with m=2 is adopted, the data to be transmitted is a= [0,1, 0]Every n=log 2 M bits are mapped to one amplitude value, i.e. 1bit is mapped to one amplitude value. For example, the mapping table is: when the information bit is 0, the mapping amplitude is-1; when the information bit is 1, the mapping amplitude is 1, and the mapped amplitude sequence is v= [ -1, -1]。
In a fourth aspect, a method of signal processing is provided, which may be performed by a receiving end device (such as a terminal device), or may also be performed by a component (such as a chip or a circuit) of the receiving end device, which is not limited thereto.
The method may include: receiving a first symbol; receiving a modulated second symbol, wherein the phase between the modulated second symbol and the first symbol is continuous, and the modulated second symbol is the next symbol of the first symbol; demodulating the modulated second symbol according to a second frequency, wherein the second frequency is a transmission frequency used by the second symbol. The modulated second symbol is obtained by modulating the second symbol according to a first phase, a second frequency and a second duration, wherein the first phase is the phase when the first symbol ends, and the second duration is the duration of a cyclic prefix of the second symbol.
Wherein the first symbol and the second symbol may be orthogonal frequency division multiplexing, OFDM, symbols carrying FSK, signals.
Based on the above technical scheme, after receiving the modulated second symbol, the receiving end device can demodulate the second symbol by adopting a demodulation technology according to the second frequency, so that the information sent by the sending end device can be demodulated.
With reference to the fourth aspect, in some implementations of the fourth aspect, the first phase is determined according to a second phase, a first frequency, and a first time duration, where the second phase is a phase of the first symbol, the first frequency is a transmission frequency used by the first symbol, and the first time duration is a remaining time duration of a time duration of the first symbol divided by a cyclic prefix.
With reference to the fourth aspect, in some implementations of the fourth aspect, the first phase is the same as a second phase, and the second phase is a phase of the first symbol.
With reference to the fourth aspect, in some implementations of the fourth aspect, the second frequency is determined according to data currently to be transmitted.
In a fifth aspect, a method for signal processing is provided, which may be performed by a receiving end device (such as a terminal device), or may also be performed by a component (such as a chip or a circuit) of the receiving end device, which is not limited thereto.
The method may include: receiving a first symbol; and receiving a third symbol, wherein the third symbol comprises a frequency gradual change signal and a second symbol, the second symbol is connected with the first symbol through the frequency gradual change signal, and the frequency between the third symbol and the first symbol is continuous. The frequency ramp signal is generated from a first phase, a first frequency, and a second frequency. The first phase is the phase at the end of the first symbol. The first frequency is a transmission frequency used by the first symbol. The second frequency is a transmission frequency used by the second symbol. The second symbol is a symbol subsequent to the first symbol. Demodulating the second symbol according to the second frequency.
Wherein the first symbol and the second symbol are orthogonal frequency division multiplexing, OFDM, symbols.
Based on the above technical scheme, after receiving the third symbol, the receiving end device may acquire the second symbol from the third symbol, and demodulate the second symbol by using a demodulation technique according to the second frequency, so as to demodulate information sent by the sending end device.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the frequency taper signal is determined according to a frequency taper sequence, the frequency taper sequence is determined according to an instantaneous frequency function and the first phase, the instantaneous frequency function is obtained according to a taper frequency function, and the taper frequency function is determined according to a duration of a cyclic prefix of the first frequency, the second frequency, and the second symbol.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the first phase is determined according to a second phase, the first frequency, and a first time duration, the second phase is a phase of the first symbol, and the first time duration is a remaining time duration of a time duration of the first symbol divided by a cyclic prefix.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the first phase is the same as a second phase, and the second phase is a phase of the first symbol.
With reference to the fifth aspect, in certain implementations of the fifth aspect, the gradual frequency function includes any one of: cosine function, deformation function of cosine function, hyperbolic tangent function.
In a sixth aspect, a method for signal processing is provided, which may be performed by a receiving end device (such as a terminal device), or may also be performed by a component (such as a chip or a circuit) of the receiving end device, which is not limited thereto.
The method may include: receiving an FSK signal, wherein the FSK signal is generated according to a square wave signal, a first amplitude and a second amplitude, the square wave signal is obtained by mapping data to be transmitted, the data to be transmitted comprises first data and second data, the first data is adjacent to the second data in transmission sequence, the first amplitude is the amplitude obtained by mapping the first data, and the second amplitude is the amplitude obtained by mapping the second data; demodulating the FSK signal according to a third frequency, wherein the third frequency is in direct proportion to the amplitude of the square wave signal.
Based on the above technical scheme, after receiving the FSK signal, the receiving end device may demodulate the FSK signal according to the third frequency by using a demodulation technique, so as to demodulate the information sent by the sending end device.
With reference to the sixth aspect, in certain implementations of the sixth aspect, the FSK signal is determined according to a first phase signal, the first phase signal being integrated according to a first signal, the first signal including the square wave signal and a ramp signal, the ramp signal being determined according to the first amplitude, the second amplitude, and a time length of the ramp signal.
With reference to the sixth aspect, in certain implementations of the sixth aspect, the FSK signal satisfies the following formula:
wherein s is FSK (t) the FSK signal at time t, v f (τ) represents the first signal, h being a constant.
With reference to the sixth aspect, in some implementations of the sixth aspect, the square wave signal is mapped from the data to be transmitted by: mapping every N bits in the data to be transmitted into an amplitude according to a preset mapping table; determining the square wave signal according to the mapped amplitude; wherein n=log2m, M is the modulation order of the FSK signal, and N is a natural number.
In a seventh aspect, there is provided an apparatus for signal processing for performing the method of any one of the possible implementations of the first to third aspects. In particular, the apparatus may comprise means and/or modules for performing the method in any one of the possible implementations of the first to third aspects.
In one possible implementation, the apparatus may include: the device comprises a receiving and transmitting unit and a processing unit, wherein the receiving and transmitting unit is used for transmitting a first symbol; the processing unit is used for modulating the phase of a second symbol according to a first phase, a second frequency and a second duration, wherein the second symbol is a symbol after the first symbol, the first phase is a phase when the first symbol ends, the second frequency is a transmission frequency used by the second symbol, and the second duration is the duration of a cyclic prefix of the second symbol; the transceiver unit is further configured to transmit a modulated second symbol using the second frequency, where a phase between the modulated second symbol and the first symbol is continuous.
In one possible implementation, the apparatus may include: the device comprises a receiving and transmitting unit and a processing unit, wherein the receiving and transmitting unit is used for transmitting a first symbol; the processing unit is used for generating a frequency gradual change signal according to a first phase, a first frequency and a second frequency, wherein the first phase is the phase when a first symbol ends, the first frequency is the transmission frequency used by the first symbol, the second frequency is the transmission frequency used by a second symbol, and the second symbol is the symbol after the first symbol; the transceiver unit is further configured to transmit a third symbol, where the third symbol includes the frequency gradual change signal and the second symbol, the second symbol is connected to the first symbol through the frequency gradual change signal, and a frequency between the third symbol and the first symbol is continuous.
In one possible implementation, the apparatus may include: the receiving and transmitting unit and the processing unit are used for generating a Frequency Shift Keying (FSK) signal according to a square wave signal, a first amplitude and a second amplitude, wherein the square wave signal is obtained by mapping data to be transmitted, the data to be transmitted comprises first data and second data, the first data and the second data are adjacent in transmission sequence, the first amplitude is the amplitude obtained by mapping the first data, and the second amplitude is the amplitude obtained by mapping the second data; the receiving and transmitting unit is used for transmitting FSK signals.
In an eighth aspect, there is provided an apparatus for signal processing, the apparatus comprising: at least one processor configured to execute a computer program or instructions stored in a memory to perform the method according to any one of the possible implementations of the first to third aspects. Optionally, the apparatus further comprises a memory for storing a computer program or instructions. Optionally, the apparatus further comprises a communication interface through which the processor reads the computer program or instructions stored in the memory.
In one implementation, the apparatus is a communication device (e.g., a sender device, and also a receiver device).
In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for a communication device (e.g., a transmitting device, and also e.g., a receiving device).
Optionally, the sending end device is a network device or a terminal device.
Optionally, the receiving end device is a terminal device.
In a ninth aspect, the present application provides a processor configured to perform the method provided in the above aspects.
The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, or may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited in this application.
In a tenth aspect, a computer readable storage medium is provided, the computer readable medium storing program code for device execution, the program code comprising instructions for performing the method of any one of the possible implementations of the first to third aspects.
In an eleventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the possible implementations of the first to third aspects described above.
A twelfth aspect provides a communication system comprising the aforementioned transmitting-end apparatus and receiving-end apparatus.
Drawings
Fig. 1 is a schematic diagram of a wireless communication system suitable for use in embodiments of the present application.
Fig. 2 is a schematic diagram of another wireless communication system suitable for use in embodiments of the present application.
Fig. 3 is a waveform diagram of a signal when FSK modulation is used.
Fig. 4 is a schematic diagram of a transmitted signal and a received signal using an OFDM modulation technique.
Fig. 5 and 6 are schematic diagrams of generating an FSK signal based on an OFDM transmitter.
Fig. 7 is a phase analysis diagram of generating an FSK signal based on an OFDM transmitter.
Fig. 8 is an FSK waveform generated using an OFDM transmitter.
Fig. 9 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter.
Fig. 10 is a schematic flow chart of a method of signal processing provided in an embodiment of the present application.
Fig. 11 is a schematic diagram of FSK waveforms generated using an OFDM transmitter based on different approaches.
Fig. 12 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter based on different approaches.
Fig. 13 shows a schematic diagram of a frequency smooth handoff.
Fig. 14 is a schematic flow chart of another method of signal processing provided by an embodiment of the present application.
Fig. 15 is a schematic diagram of the temporal frequency variation with time.
Fig. 16 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter based on different approaches.
Fig. 17 is a schematic flow chart of another method of signal processing provided by an embodiment of the present application.
Fig. 18 is a schematic diagram of a square wave signal generated by modulating information.
Fig. 19 is a waveform schematic diagram of inserting a gradation signal between square wave signals.
Fig. 20 is a schematic block diagram of an apparatus for signal processing according to an embodiment of the present application.
Fig. 21 is a schematic block diagram of another apparatus for signal processing provided by an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
In order to facilitate understanding of the embodiments of the present application, the following description is made before describing the embodiments of the present application.
First, in the embodiments of the present application, "first", "second" and various numerical numbers are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. The following sequence numbers of the processes do not mean the sequence of execution, and the execution sequence of the processes should be determined by the functions and internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present application. Moreover, the words "1010", "1410", "1710" and the like are merely identifiers for descriptive convenience and do not limit the order in which the steps are performed.
Second, in the embodiments of the present application, the descriptions of "when … …", "in the case of … …", "if" and the like all refer to that the device will make a corresponding process under some objective condition, and are not limited in time, nor do they require that the device have to have a judging action when implemented, nor do they mean that there are other limitations. In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
Third, the duration of the cyclic prefix, the duration of the symbol, and the like referred to herein are all referred to as time lengths. For example, the time period (i.e., the instant length) referred to herein may be in units of T c ＝1/(4096·480·10 3 ) Second. As another example, the length of time may also be expressed in terms of the number of time-domain samples, which is not limited.
The technical scheme provided by the application can be applied to various communication systems, such as: fifth generation (5th generation,5G) or New Radio (NR) systems, long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD) systems, and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation (6th generation,6G) mobile communication system. The technical solutions provided herein may also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (machine to machine, M2M) communication, machine type communication (machine type communication, MTC), and internet of things (internet of things, ioT) communication systems or other communication systems.
The terminal device in the embodiments of the present application may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment.
The terminal device may be a device that provides voice/data to a user, e.g., a handheld device with wireless connection, an in-vehicle device, etc. Currently, some examples of terminals are: a mobile phone, tablet, laptop, palmtop, mobile internet device (mobile internet device, MID), wearable device, virtual Reality (VR) device, augmented reality (augmented reality, AR) device, wireless terminal in industrial control (industrial control), wireless terminal in unmanned (self driving), wireless terminal in teleoperation (remote medical surgery), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), cellular phone, cordless phone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to wireless modem, wearable device, terminal device in 5G network or terminal in future evolved land mobile communication network (public land mobile network), and the like, without limiting the present application.
By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.
In the embodiment of the present application, the device for implementing the function of the terminal device may be the terminal device, or may be a device capable of supporting the terminal device to implement the function, for example, a chip system or a chip, and the device may be installed in the terminal device. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.
The network device in the embodiments of the present application may be a device for communicating with a terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master station, a secondary station, a multi-mode radio (motor slide retainer, MSR) node, a home base station, a network controller, an access node, a radio node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a remote radio unit (remote radio unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for placement within the aforementioned device or apparatus. The base station may be a mobile switching center, a device that performs a base station function in D2D, V2X, M M communication, a network side device in a 6G network, a device that performs a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.
The base station may be fixed or mobile. For example, a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device to communicate with another base station.
In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a device of a control plane CU node (central unit-control plane, CU-CP) and a user plane CU node (central unit-user plane, CU-UP) of a user plane, and a DU node.
Network devices and terminal devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. In the embodiment of the application, the scene where the network device and the terminal device are located is not limited.
A network architecture suitable for the present application will first be briefly described in connection with fig. 1 and 2.
Fig. 1 shows a schematic diagram of a wireless communication system 100 suitable for use in embodiments of the present application. As shown in fig. 1, the wireless communication system 100 may include at least one network device, such as the network device 110 shown in fig. 1, and the wireless communication system 100 may further include at least one terminal device, such as the terminal device 120 shown in fig. 1. The network device and the terminal device may each be configured with multiple antennas, and the network device may send downlink signals to the terminal device through the multiple antennas.
Fig. 2 shows a schematic diagram of a wireless communication system 200 suitable for use in embodiments of the present application. As shown in fig. 2, the wireless communication system 200 may include a plurality of terminal devices, such as terminal device 210 and terminal device 220 shown in fig. 2. The wireless communication system 200 may support a sidelink (sidelink) communication technique, and sidelink communication may be performed between a plurality of terminal devices (e.g., between the terminal device 210 and the terminal device 220). That is, signals can be transmitted to each other between different terminal apparatuses.
It should be appreciated that fig. 1 and 2 are simplified schematic diagrams illustrating only for ease of understanding, other network devices may be included in the wireless communication system 100 or other terminal devices may be included in the wireless communication system 200, which are not shown in fig. 1 and 2. It should also be appreciated that embodiments of the present application may be applicable to any communication scenario in which a sender device and a receiver device communicate.
To facilitate understanding of the embodiments of the present application, a brief description of related art content referred to in the present application will be first provided.
1. Modulation technique
The modulation technique is a technique for controlling the amplitude, phase or frequency change of a carrier wave according to information to be transmitted, thereby transmitting information through the carrier wave.
2. Demodulation technique
Demodulation techniques are the inverse of modulation techniques. The receiving device generally obtains the information transmitted by the transmitting device from the modulated signal (signal modulated by the transmitting device) by some signal processing means.
3. Frequency shift keying (frequency shift keying, FSK) modulation techniques
The FSK modulation technique is a modulation technique commonly used in wireless communication, and is generally applied to a narrow-bandwidth, low-rate communication system (communication rate is generally below 1 Mbps), for example, a 2G system, bluetooth, and the like. FSK uses the frequency of the transmitted signal to carry the information that needs to be transmitted.
As an example, fig. 3 is a waveform diagram when the signal is FSK modulated. The upper half of fig. 3 is an exemplary FSK waveform, which can be seen to resemble a cosine function but using a different frequency. The lower part of fig. 3 shows the instantaneous frequency of the signal as a function of time, and it can be seen that a higher frequency f is used in the first and third symbols 1 While in the second symbol a lower frequency f is used 0 。
As shown in fig. 3, assuming that the information bits to be transmitted are a sequence of 0,1, one possible way is to transmit a frequency f 0 The signal representative of (2) is transmitted with bit "0", the transmission frequency is f 1 Representing the transmitted bit "1". At the receiving end, a frequency discrimination circuit can be used to detect the frequency of the received signal. If the detected signal frequency is f 0 Judging that the received bit is 0; if the detected signal frequency is f 1 The received bit is judged to be 1.
The example shown in FIG. 3 may be referred to as 2-FSK, i.e., with 2 modulation frequencies (i.e., f 0 And f 1 ) At this point one symbol carries one bit. But the FSK can be extended to carry more bits, e.g. FSK modulation (4-FSK) with 4 different frequencies, then one symbol can carry 2 bits of information, e.g. with f 0 Representing bit "00", f 1 Representing bit "01", f 2 Representing bit "10", f 3 Representing bit "11".
It will be appreciated that the transmission signal of the nth FSK symbol may be expressed asWherein, (n-1) T sym ≤t<n·T sym ，T sym Is FSK symbol length, t is time, < ->Is the initial phase of the nth FSK symbol.
FSK modulation technology has the advantages of strong noise immunity, constant envelope and the like. When the signal adopts FSK modulation, the receiver has simple structure and lower cost and power consumption. For example, the receiver may use a simpler frequency discrimination circuit to determine the received signal. It will be appreciated that the cost and power consumption of the frequency discrimination circuit is typically low, and is suitable for some low rate traffic end devices, such as internet of things (IoT) devices.
4. Modulation order
The modulation order is used to calculate the number of bits each symbol (symbol) of the pattern can represent. If the modulation order is M, the number of bits each symbol (symbol) can represent is log 2 M, i.e. one symbol (symbol) may carry log 2 M bits of information. At this time, the FSK with the modulation order M may be referred to as M-FSK.
For example, if the modulation order is 2, one symbol (symbol) may carry 1bit of information. At this time, if the bits of the information to be transmitted include a sequence of "0" and "1", each symbol may transmit 1bit. The transmission frequency is f 0 The FSK signal of (2) may represent a transmission of "0" with a transmission frequency f 1 May represent a transmission of a "1".
For another example, if the modulation order is 4, one symbol (symbol) may carry 2 bits of information. At this time, a 01 bit sequence of the transmitted information can be considered, and each symbol can transmit 2 bits. The transmission frequency is f 0 The FSK signal of (2) may represent a transmission of "00" with a transmission frequency f 1 The FSK signal of (2) may represent a transmission of "01" with a transmission frequency f 2 The FSK signal of (2) may represent a transmission of "10" with a transmission frequency f 3 The FSK signal of (c) may represent a transmission of "11".
5. Orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) modulation techniques
OFDM is a widely used modulation technique, and OFDM modulation is generally applied in a mobile broadband system, for example, 802.11 (WIFI), 4G (LTE), 5G (NR), etc., to provide a high transmission rate by using a higher communication bandwidth. In most deployment scenarios, OFDM can provide transmission rates of at least 1Mbps or more.
OFDM divides the system bandwidth into a plurality of parallel subcarriers and modulates data for transmission on each subcarrier, each subcarrier having a different frequency.
As an example, fig. 4 is a schematic diagram of transmitting and receiving signals using OFDM modulation techniques.
As shown in fig. 4, the flow of transmitting signals by the transmitting end may include the following steps. First, the coded bit stream is modulated (modulated) and mapped into a complex symbol, which may be, for exampleWherein a is the amplitude of the symbol, +.>Is the phase of the symbol. The modulation scheme for modulating the coded bit stream may be, for example, quadrature amplitude modulation (quadrature amplitude modulation, QAM), and the resulting complex symbols may be, for example, QAM symbols. Then, serial/parallel conversion (S/P) is performed on the modulated symbols, and the S/P processed symbols are mapped to different subcarriers, respectively. The symbols on the different subcarriers are transformed into a time-domain sequence by an inverse fast fourier transform (inverse fast Fourier transform, IFFT) operation. In conventional OFDM symbol processing, the tail part of the time-domain sequence is copied to the front end of the signal as a Cyclic Prefix (CP). The main role of CP is to combat multipath propagation delays in the antenna channel. Finally, after CP addition is completed for the IFFT symbol, parallel/serial conversion (P/S), digital-to-analog conversion (digital to analog conversion, D/A), And up-converted and then transmitted to a channel (channel).
As shown in fig. 4, the process of receiving a signal by a receiving end may include the following steps. After analog-to-digital conversion (a/D) of the received signal, a correction carrier frequency shift (carrier frequency offset, CFO) is performed, followed by S/P, decp. The signal after the CP removal is subjected to a fast fourier transform (fast fourier transform, FFT) operation, then to phase tracking (P/S), and finally to demodulation.
It will be appreciated that the specific flow of transmitting signals and receiving signals described above is illustrative, and the present application is not limited thereto.
Many of the current cellular mobile communication networks use OFDM modulation techniques, such as 4G LTE and 5G NR. The main purpose of cellular networks is to provide mobile broadband services (Mobile Broad band, MBB) including high-speed internet surfing, video browsing, file downloading, etc. using mobile devices such as cell phones, tablets, etc.
In recent years, however, there has been a trend toward diversification of services provided by cellular networks, and many user equipments, which require low communication rates, but have high demands for low cost and low power consumption of receivers. For example, ioT devices, wearable devices (e.g., smartwatches), low power wake links, and the like. OFDM is not a suitable modulation scheme for these devices because OFDM receivers require accurate time-frequency synchronization and complex signal processing, requiring high cost and power consumption. It is considered that these devices are served using a simpler modulation scheme, for example, an FSK modulation scheme.
In order to achieve the purpose of serving different types of terminals, a direct method is that two sets of transmitters can be arranged on a base station of a mobile communication network, one set of transmitters is used for transmitting OFDM signals to serve mobile broadband users, and the other set of transmitters is used for transmitting FSK signals to serve low-rate users. But this requires hardware upgrades to existing network equipment, i.e. adding a set of FSK transmitters on the basis of existing OFDM transmitters. This can be costly for the deployer of the network.
Alternatively, the transmitter may still use an existing OFDM transmitter architecture, but may generate other modulated waveforms at certain frequency bands by some means of signal processing. For example, an OFDM transmitter may easily generate FSK modulated waveforms over certain frequency bands.
As described above, OFDM is composed of a plurality of subcarriers, each of which has a different frequency, and when modulation is selected for a different subcarrier, signals having different frequencies are formed without modulating signals for other subcarriers, and thus FSK signals are substantially generated. Thus, only an upgrade of the baseband processing section is required for the transmitter, i.e., waveforms of other modulation techniques (e.g., FSK) can be generated with the OFDM transmitter.
6. FSK modulation technology based on OFDM transmitter
The FSK modulation technique based on an OFDM transmitter, i.e. generating the FSK signal based on an OFDM transmitter, may in particular be implemented by modulating the signal on different sub-carriers.
As an example, fig. 5 and 6 are schematic diagrams of generating an FSK signal based on an OFDM transmitter. The subcarrier interval used for the FSK signal may be the same as or different from the subcarrier interval of other OFDM symbols in the adjacent band. In some embodiments, as shown in fig. 5, on the same carrier, the subcarriers used for mobile broadband traffic may be with 15kHz subcarrier spacing, and the FSK signal may also be with 15kHz subcarrier spacing. In other embodiments, as shown in fig. 6, on the same carrier, the subcarriers used for mobile broadband traffic may be with 15kHz subcarrier spacing, while the FSK signal may be with 60kHz subcarrier spacing.
It can be appreciated that OFDM modulation actually partitions the spectrum resources of the system into a grid of time-frequency two dimensions. As shown in fig. 5 or 6, in the time domain dimension, slicing is performed with OFDM symbols (OFDM symbols) as granularity; in the frequency dimension, the segmentation is performed with the sub-carriers as granularity.
Assume that an OFDM transmitter uses N OFDM Subcarriers, e.g. N OFDM =32. At N OFDM Determination of N in subcarriers FSK Subcarriers are used for generating FSK modulated signals, where N FSK ≤N OFDM For example, N FSK =2 (i.e. the subcarriers in the black position in fig. 5 or fig. 6). Assume that the frequencies of the two subcarriers are f, respectively 0 And f 1 . While other sub-carriers may still be used as normal OFDM signals, for example, to provide service mobile broadband services. Thus, the transmitting end can still generate OFDM signals by using the OFDM transmitter, but at the receiving end, if a narrow-band filter is used, only N in the signals are used FSK After bandwidth filtering of the sub-carriers, the resulting signal is then an FSK signal.
The foregoing is illustrative, and the present application is not limited thereto.
In some embodiments, on the nth OFDM, the frequency is selected to be f according to the information bits to be transmitted n At f n ∈{f 0 ,f 1 Modulated on subcarriers with a complex symbol, denoted asIf the modulated data on the further sub-carriers are not considered (or are considered to be 0, since these will be filtered out at the receiving end), then after FFT the time domain signal is expressed as:
wherein T is cp Is the length of the cyclic prefix, t start,n And t end,n The start time and the end time of the nth OFDM symbol, respectively. It should be noted that other subcarriers for mobile broadband are not considered here, since the signals of other subcarriers can be filtered out by a filter at the receiving end.
As can be seen from equation 1, this is a single frequency signal, the frequency of which is f n . Thus by modulating complex symbols on different sub-carriers, time domain signals of different frequencies can be formed, thereby forming FSK signals.
From equation 1, it can also be seen thatAt the time t of ending the CP cp,end ＝t start,n +T cp The expression of the FSK signal is:
as can be seen from equation 2, at the point of time when CP ends, the phase of the time domain signalThe same phase as the modulated complex signal.
From the above, when generating an FSK signal using an OFDM transmitter, the following two problems may exist.
The first problem is that the phase between the FSK signal symbols may not be continuous. This is because OFDM symbols add a cyclic prefix, causing additional phase rotation, and thus the phase between the preceding and following symbols may not be continuous.
As an example, fig. 7 is a phase analysis diagram of generating an FSK signal based on an OFDM transmitter. As shown in fig. 7, fig. 7 shows two OFDM symbols, each of which modulates only one subcarrier, wherein the subcarrier frequency modulated by OFDM symbol n-1 is f n-1 The complex symbols modulated on the subcarriers areThe subcarrier frequency modulated by the OFDM symbol n is f n The complex symbol modulated on the carrier is +. >Each OFDM symbol consists of two periods of time, T cp Is the duration of the cyclic prefix, T os Is the duration of the remaining symbols.
Comparing the formula (1), the end time t of the OFDM symbol n-1 can be calculated n-1 ＝T cp +T os +t start,n-1 The time domain signal expression is:
with a phase ofWherein f n-1 Subcarrier frequency modulated for OFDM symbol n-1, T os For the remaining duration of the OFDM symbol n-1 divided by the cyclic prefix, +.>The transmission frequency used for OFDM symbol n-1.
Also, comparing equation (1), the starting time of OFDM symbol n can be calculated as t n ＝t start,n The time domain signal expression is:
with a phase ofWherein f n Subcarrier frequency modulated for OFDM symbol n, T cp Is the duration of the cyclic prefix of OFDM symbol n, < >>The transmission frequency used for OFDM symbol n.
The phase at which the preceding OFDM symbol ends and the phase at which the following OFDM symbol begins are not necessarily the same, i.eTherefore, the corresponding waveform may appear to jump in phase.
As an example, fig. 8 is an FSK waveform generated using an OFDM transmitter. As shown in fig. 8, it can be seen that at the juncture of two adjacent OFDM symbols, a 180 ° jump in phase of the waveform occurs. It will be appreciated that a large phase jump will result in a large out-of-band energy leakage of the spectrum, and that a phase jump exceeding 90 ° is generally considered to result in a large out-of-band leakage.
Another problem is that frequency hopping occurs when using an OFDM transmitter to generate an FSK signal, and if adjacent OFDM symbols use different subcarriers, the frequency of the signal hops from the subcarrier frequency of the previous symbol to the subcarrier frequency of the next symbol at the juncture of two OFDM symbols.
From a signal processing perspective, both phase and frequency hopping can lead to out-of-band frequency leakage (out-of-band version). That is, although N is allocated FSK The sub-carriers are used for transmission of FSK signals, but the spectrum of the actual waveform will have a large energy distribution outside the range of the allocated bandwidth, which will cause severe interference to the signals transmitted on its neighboring frequency bands.
As an example, fig. 9 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter. In this example, an OFDM transmitter is used to generate the FSK signal, which uses only two subcarriers, whose frequencies are f, respectively 0 =240 kHz and f 1 =300 kHz. As can be seen from fig. 9, although the energy is mostly concentrated on the allocated frequency band, the frequency spectrum leakage thereof affects the frequency bands far apart due to the phase jump and the frequency jump, i.e., the problem of out-of-band leakage occurs.
It can be appreciated that during the actual transmission of the signal, the spectrum of the actual waveform of the signal has a larger energy distribution outside the allocated bandwidth range, so that serious interference is generated on the signal transmitted on the adjacent frequency band, the transmission of the signal on the adjacent frequency band is affected, and the problem of out-of-band leakage is generated. As described above, when generating an FSK signal using an OFDM transmitter, for example, transmission of signals on adjacent frequency bands may be affected due to factors such as phase hopping, frequency hopping, and the like.
In view of this, the present application proposes a method and apparatus for signal processing, which can reduce interference generated by signals transmitted on adjacent frequency bands during transmission. The present application mainly solves the above problems from two aspects, namely, by additional phase rotation, the phase continuity between the front symbol and the rear symbol is ensured, and the phase jump problem (for example, fig. 11) between the front symbol and the rear symbol is avoided, so that the interference generated by the signal on the signal transmitted on the adjacent frequency band in the transmission process is reduced; and secondly, by introducing a frequency gradual change sequence, frequency hopping (for example, fig. 13 and 19) between the front symbol and the rear symbol is avoided, so that interference generated by signals transmitted on adjacent frequency bands in the transmission process is reduced.
The method for signal processing provided in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments provided in the present application may be applied to the network architecture shown in fig. 1 and/or fig. 2, and are not limited thereto.
Fig. 10 is a schematic flow chart of a method of signal processing provided in an embodiment of the present application.
In one example, the transmitting device may be the network device 110 of fig. 1 and the receiving device may be the terminal device 120 of fig. 1.
In another example, the transmitting device may be the terminal device 210 in fig. 2 and the receiving device may be the terminal device 220 in fig. 2.
In yet another example, the transmitting device may be the terminal device 220 in fig. 2 and the receiving device may be the terminal device 210 in fig. 2.
For example, as shown in fig. 10, the method 1000 of signal processing may include S1010 to S1040. S1010 to S1040 are described in detail below.
It can be understood that the transmitting device related to the embodiment of the present application is the transmitting end device, and the receiving device is the receiving end device.
S1010, the transmitting device transmits the first symbol. Correspondingly, the receiving device receives the first symbol.
Illustratively, the first symbol may be OFDM symbol n-1 in FIG. 7, i.e., the n-1 th OFDM symbol.
S1020, the transmitting device modulates the phase of the second symbol according to the first phase, the second frequency, and the second duration.
Wherein the transmitting device modulating the phase of the second symbol according to the first phase, the second frequency and the second duration may be understood as: the transmitting device determines a third phase according to the first phase, the second frequency and the second duration, and modulates the phase of the second symbol according to the third phase, so that the phase of the second symbol is equal to the third phase, thereby obtaining a modulated second symbol.
It will be appreciated that the modulated second symbol differs from the second symbol in that: the phase of the modulated second symbol is different from the phase of the second symbol and the other characteristics (e.g., the duration of the symbol) are the same. That is, the duration of the modulated second symbol is the same as the duration of the second symbol, and the transmission frequency used by the modulated second symbol is the same as the transmission frequency of the second symbol.
It should be appreciated that the transmitting device may determine the first phase, the second frequency, and the second duration.
For example, the transmitting device may determine the first phase.
Wherein the first phase is the phase at the end of the first symbol, and the first phase may be, for example
It will be appreciated that since the transmitting device knows the waveform of the signal transmitted, the transmitting device can determine the phase at the end of the first symbol.
In one example, the first phase may be determined from the second phase, the first frequency, and the first time length.
Specifically: the transmitting device may determine a second phase, which is the phase of the first symbol, e.g. a second phase ofThe transmitting device may determine a first frequency, which is the transmission frequency used by the first symbol, e.g., a first frequency f n-1 The method comprises the steps of carrying out a first treatment on the surface of the The transmitting device may determine a first duration that is the remaining duration of the first symbol divided by the cyclic prefix, e.g., a second duration of T os . The first phase is for example +.>
In another example, the first phase is the same as the second phase.
Specifically, in the OFDM modulation scheme, if the remaining duration of each OFDM symbol is an integer multiple of the duration of one period of the subcarrier, i.e., T os ＝k*1/f n Wherein k is any integer. The phase at the end of the first symbol (e.g., OFDM symbol n-1) is the same as the phase of the first symbol, i.e., the first phase is the same as the second phase. That is, the first phase may be
For example, the transmitting device may determine the second frequency.
The second frequency is a transmission frequency used by a second symbol, and the second symbol is a symbol after the first symbol. It will be appreciated that the first symbol is the symbol currently being symbol modulated, and the second symbol may be, for example, OFDM symbol n in fig. 7, i.e., the nth OFDM symbol.
It should be noted that, the transmitting device may determine, according to the data to be transmitted, a transmission frequency used by the second symbol (i.e., a second frequency), e.g., the second frequency is f n 。
For example, if the modulation order of the FSK signal is 2, one symbol may carry 1 bit of information. At this time, the bits of the transmitted information may be considered to include a sequence of "0" and "1", with a transmission frequency f 0 May represent a transmission of "0" with a transmission frequency f 1 May represent a transmission of a "1". That is, the transmitting device may determine the second frequency to be f according to whether the data to be transmitted is 0 or 1 0 Or f 1 。
For example, the transmitting device may determine the second duration.
Wherein the second duration is a duration of a cyclic prefix of the second symbol. For example, the second time period is T cp,n . As shown in fig. 7, the duration of the second symbol may include a second duration (i.e. T cp,n ) And the remaining time length (i.e. T os,n )。
In some embodiments, after determining the first phase, the second frequency, and the second time period, the transmitting device may determine a third phase based on the first phase, the second frequency, and the second time period; a modulation symbol is determined from the third phase and may be transmitted to the receiving device on a second frequency (i.e., on a second subcarrier). That is, the phase of the second symbol modulated by the transmitting device can be understood as: the transmitting device modulates the phase of the modulation symbols carried on the second frequency.
It will be appreciated that the transmitting device may modulate a symbol on a selected sub-carrier of the nth OFDM symbol, wherein the phase of the modulated symbol (i.e. the third phase) is equal in magnitude to the phase of the modulated second symbol. That is, in the embodiment of the present application, the third phase, the phase of the modulation symbol, and the phase of the modulated second symbol may be regarded as the same.
The transmitting device may determine the third phase according to the first phase, the second frequency, and the second time period. More specifically, the third phase may be
In one example, the first phase may beThe third phase may be + >
In another example, the first phase isThe third phase is
Exemplary, further, the transmitting deviceA modulation symbol may be determined from the third phase, which may be, for example
It will be appreciated that, as shown in FIG. 7, if the phase of the modulated second symbol (i.e., the third phase) isThen at the start position of the second symbol its phase is +.>That is, the phase of the start position of the second symbol (e.g.)>) Phase with the end position of the first symbol (e.g.)>) Equal, i.e.So that the phase continuity between adjacent symbols can be maintained. />
S1030, the transmitting device transmits the modulated second symbol using the second frequency. Correspondingly, the receiving device receives the modulated second symbol.
The modulated second symbol may be, for example, OFDM symbol n in fig. 7, i.e., the nth OFDM symbol.
It will be appreciated that the phase of the modulated second symbol may be varied, i.e. the phase at the end of the first symbol may be kept the same as the phase at the beginning of the modulated second symbol, so that the phase of the modulated second symbol is continuous with the phase of the first symbol.
S1040, the receiving device demodulates the received modulated second symbol according to the second frequency.
It should be understood that, after receiving the modulated second symbol, the receiving device may demodulate the modulated second symbol by using a demodulation technique according to the second frequency corresponding to the modulated second symbol, so as to obtain information to be transmitted.
In this embodiment of the present application, the transmitting device may determine a third phase according to the first phase, the second frequency and the second duration, and modulate the phase of the second symbol according to the third phase, so that the phase of the second symbol is equal to the third phase, thereby obtaining a modulated second symbol. Compared with the second symbol, the phase of the modulated second symbol changes, so that the phase between the modulated second symbol and the first symbol is continuous, and thus, the phase between adjacent symbols is continuous, no phase jump occurs, and the interference of signals transmitted on adjacent frequency bands in the transmission process can be reduced.
As an example, fig. 11 is a schematic diagram of FSK waveforms generated using an OFDM transmitter based on different approaches.
As shown in the upper graph of fig. 11, the upper graph of fig. 11 is a schematic diagram of an FSK waveform generated using an OFDM transmitter based on the prior art, and it is obvious from the graph that phase jump occurs in the boundary (i.e., in CP) between two adjacent OFDM symbols, and the FSK waveform exhibits phase jump.
As shown in the lower graph in fig. 11, the lower graph in fig. 11 is a schematic diagram of an FSK waveform generated by using an OFDM transmitter after the signal processing method 1000 according to the embodiment of the present application, it is obvious from the graph that no phase jump occurs in the boundary (i.e., in the CP) between two adjacent OFDM symbols, and no phase jump occurs in the FSK waveform.
As an example, fig. 12 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter based on different approaches.
As shown in fig. 12, curve (1) in fig. 12 is a power spectrum diagram for generating an FSK signal using an OFDM transmitter based on the prior art, and it can be seen that although the energy of curve (1) is mostly concentrated on the allocated frequency bands, the frequency spectrum leakage thereof affects the frequency bands far apart due to the phase jump. Curve (2) in fig. 12 is a power spectrum diagram of an FSK signal generated by using an OFDM transmitter after the method 1000 for signal processing according to an embodiment of the present application, because phase jump is avoided, out-of-band leakage of the signal is significantly reduced, and interference generated by the signal on a signal transmitted on an adjacent frequency band during transmission is reduced.
As previously mentioned, another reason for out-of-band leakage is the frequency hopping that occurs between the front and back symbols. Therefore, the embodiment of the present application will describe another signal processing method provided in the present application with reference to fig. 13 to 17, mainly by adopting a smooth frequency gradual change manner between adjacent symbols.
As an example, fig. 13 shows a schematic diagram of a frequency smooth handoff.
Considering the symbol generated with the OFDM transmitter, the frequency of the modulated signal is determined by the subcarriers used within the OFDM symbol (i.e., the remaining symbol) except for the CP portion, and thus the frequency is a fixed value. And in the CP range between the symbols, a signal with gradual frequency change can be used, so that the frequency is smoothly gradually changed from the frequency used by the previous symbol to the frequency of the next symbol, thereby avoiding frequency jump.
As shown in fig. 13, in the process of OFDM symbol generation, at the position of CP, the end portion of OFDM symbol is not copied to the forefront, but a frequency gradation sequence is inserted therein so that the frequency is smoothly shifted from the frequency of the previous symbol to the frequency of the current symbol.
Fig. 14 is a schematic flow chart of another method of signal processing provided by an embodiment of the present application.
In one example, the transmitting device may be the network device 110 of fig. 1 and the receiving device may be the terminal device 120 of fig. 1.
In another example, the transmitting device may be the terminal device 210 in fig. 2 and the receiving device may be the terminal device 220 in fig. 2.
In yet another example, the transmitting device may be the terminal device 220 in fig. 2 and the receiving device may be the terminal device 210 in fig. 2.
For example, as shown in fig. 14, the method 1400 of signal processing may include S1410 to S1440. S1410 to S1440 are described in detail below.
It can be understood that the transmitting device related to the embodiment of the present application is the transmitting end device, and the receiving device is the receiving end device.
S1410, the transmitting device transmits the first symbol. Correspondingly, the receiving device receives the first symbol.
Illustratively, the first symbol may be OFDM symbol n-1 in FIG. 7, i.e., the n-1 th OFDM symbol.
S1420, the transmitting device generates a frequency-graded signal according to the first phase, the first frequency, and the second frequency.
The first phase is a phase when the first symbol ends, the first frequency is a transmission frequency used by the first symbol, the second frequency is a transmission frequency used by the second symbol, and the second symbol is a symbol after the first symbol. The second symbol may be, for example, OFDM symbol n in fig. 7, i.e., the nth OFDM symbol.
It will be appreciated that the frequency taper signal is determined from a frequency taper sequence determined from an instantaneous frequency function and a first phase, the instantaneous frequency function being derived from a taper frequency function determined from the first frequency, the second frequency and the duration of the cyclic prefix of the second symbol.
In one possible implementation, S1420 may include S1420-1 to S1420-4.
S1420-1, the transmitting device determines a first phase, a first frequency, and a second frequency.
Wherein the first frequency is the transmission frequency used by the first symbol, i.e. the first frequency is the subcarrier frequency used by the first symbol, e.g. the first frequency is f n-1 。
The second frequency is the transmission frequency used by the second symbol, i.e. the second frequency is the subcarrier frequency used by the second symbol, e.g. the second frequency is f n 。
The first phase being the phase at the end of the first symbol, e.g.The first phase may be
In one example, the first phase may be determined from the second phase, the first frequency, and the first time length. The part of the content may refer to S1020, and is not described herein.
In another example, the first phase is the same as the second phase. The part of the content may refer to S1020, and is not described herein.
S1420-2, the transmitting device determines a ramp frequency function according to the first frequency and the second frequency.
The gradual change frequency function can be a cosine function, a deformation function of the cosine function, a hyperbolic tangent function and other smooth curves.
Illustratively, the frequency gradation function is illustrated as a cosine function, which may correspond to the dashed line portion in fig. 13.
Let the gradual change frequency function be f transient (t) the expression may be:
as can be seen from equation 5, the gradual frequency function can be based on the first frequency f n-1 Second frequency f n And the duration T of the cyclic prefix of the second symbol cp And (3) determining.
Since in the digital signal processing section, f is actually generated transient The sampling sequence of (t), that is, the ramp frequency function, may be converted to an instantaneous frequency (i.e., a smoothly ramp sequence). In other words, the instantaneous frequency function may be derived from the progressive frequency function.
Wherein f transient (m) is the instantaneous frequency; f (f) s Is the sampling rate; n (N) cp And (5) counting the sampling points in the CP duration.
S1420-3, the transmitting device generates a sequence of frequency gradual changes from the instantaneous frequency function and the first phase.
For example, the expression for the frequency taper sequence may be:
as can be seen from equation 7, the frequency ramp sequence s (m) can be based on the instantaneous frequency function f transient (t) and first phaseAnd (5) determining.
S1420-4, the transmitting device generates a frequency taper signal according to the frequency taper sequence.
For example, the transmitting device may place the frequency-graded sequence s (m) in front of each OFDM symbol, i.e., at the position of each symbol CP, and digital-to-analog convert the sequence to generate the frequency-graded signal.
It will be appreciated that by inserting a frequency taper sequence at the CP position of a symbol such that the frequency is smoothly transitioned from the frequency of the previous symbol to the frequency of the current symbol, e.g., from the frequency of the first symbol to the frequency of the second symbol, frequency hopping may be avoided.
S1430, the transmitting device transmits the third symbol. Correspondingly, the receiving device receives the third symbol.
Wherein the third symbol includes a frequency gradual signal (e.g., CP portion in fig. 13) and a second symbol connected to the first symbol through the frequency gradual signal, and frequency between the third symbol and the first symbol is continuous. The third symbol may be, for example, OFDM symbol n in fig. 7, i.e., the nth OFDM symbol.
It can be appreciated that by inserting a frequency gradual change signal at the CP position of the third symbol, the frequencies of adjacent symbols are continuously changed, so that the problem of frequency hopping can be avoided.
S1440, the receiving device demodulates the second symbol according to the second frequency.
It should be understood that, after the receiving device receives the third symbol, the receiving device may acquire the second symbol from the third symbol, and demodulate the second symbol by using a demodulation technique according to a second frequency corresponding to the second symbol, so as to obtain information to be transmitted.
In the embodiment of the application, in the process of generating the OFDM symbol, the end part of the OFDM symbol is not copied to the forefront part at the position of the CP, but a frequency gradual change sequence is inserted in the end part of the OFDM symbol, so that the frequency is smoothly converted from the frequency of the previous symbol to the frequency of the current symbol, and the interference generated by signals transmitted on adjacent frequency bands in the transmission process of the signals can be reduced.
As an example, fig. 15 is a schematic diagram of temporal frequency variation with time, and it can be seen from fig. 15 that the frequency does not jump directly between symbols, but is graded by a smoothing function.
As an example, fig. 16 is a power spectrum diagram of generating an FSK signal using an OFDM transmitter based on different approaches.
As shown in fig. 16, curve (1) in fig. 16 is a power spectrum diagram for generating an FSK signal using an OFDM transmitter based on the prior art, and it can be seen that although the energy of curve (1) is mostly concentrated on the allocated frequency bands, the frequency spectrum leakage thereof affects the frequency bands far apart due to the phase jump. Curve (2) in fig. 16 is a power spectrum diagram of an FSK signal generated using an OFDM transmitter after using the signal processing method 1000 according to the embodiment of the present application, because phase jump is avoided, out-of-band leakage of the signal is significantly reduced, and out-of-band energy leakage is significantly reduced after using the signal processing method 1000 according to curve (2). Curve (3) in fig. 16 is a power spectrum diagram of an FSK signal generated by using an OFDM transmitter based on the signal processing method 1400 in the embodiment of the present application, and it can be seen from the figure that the signal processing method 1400 can bring about a better out-of-band interference suppression effect.
Fig. 17 is a schematic flow chart of another method of signal processing provided by an embodiment of the present application.
In one example, the transmitting device may be the network device 110 of fig. 1 and the receiving device may be the terminal device 120 of fig. 1.
In another example, the transmitting device may be the terminal device 210 in fig. 2 and the receiving device may be the terminal device 220 in fig. 2.
In yet another example, the transmitting device may be the terminal device 220 in fig. 2 and the receiving device may be the terminal device 210 in fig. 2.
For example, as shown in fig. 17, the method 1700 of signal processing includes S1710 to S1730. S1710 to S1730 are described in detail below.
It can be understood that the transmitting device related to the embodiment of the present application is the transmitting end device, and the receiving device is the receiving end device.
S1710, the transmitting device generates an FSK signal according to the square wave signal, the first amplitude and the second amplitude,
the square wave signal is obtained by mapping data to be transmitted, the data to be transmitted comprises first data and second data, the first data and the second data are adjacent in transmission sequence, the first amplitude is the amplitude obtained by mapping the first data, and the second amplitude is the amplitude obtained by mapping the second data.
It will be appreciated that the FSK signal is determined from a first phase signal which is integrated from a first signal comprising a square wave signal and a ramp signal which is determined from a first amplitude, a second amplitude and a time length of the ramp signal.
In one possible implementation, S1710 may include S1710-1 through S1710-5.
S1710-1, the transmitting device maps the data to be transmitted into a square wave signal.
By way of example, the transmitting device may map the data to be transmitted into square wave signals in the following manner: mapping every N bits in data to be transmitted into an amplitude according to a preset mapping table; a square wave signal is determined from the mapped out amplitude. Where n=log 2 M is FSK messageThe modulation order of the number, N is a natural number.
Assuming that FSK modulation with m=2 is adopted, the data to be transmitted is a= [0,1, 0]Every n=log 2 M bits are mapped to one amplitude value, i.e. 1bit is mapped to one amplitude value. For example, the amplitude sequence mapped by using the mapping relation table shown in Table 1 is v= [ -1, -1]。
TABLE 1
Information bits Mapping amplitude v n
0 -1
1 1
According to the mapping table shown in table 1, the generated square wave sequence is shown in fig. 18, for example, and fig. 18 is a schematic diagram of a square wave signal generated by modulating information. With amplitude values on the ordinate and time on the abscissa, the period of the square wave signal may be, for example, the remaining duration T of the OFDM symbol os 。
S1710-2, the transmitting device determines a fade signal.
In particular, the transmitting device may determine a first amplitude that is the amplitude mapped by the first data and a second amplitude that is the amplitude mapped by the second data. The first amplitude may be v, for example n-1 The second amplitude may be v, for example n 。
The gradual change signal may be generated by a smoothing function such as a cosine function, a hyperbolic tangent function, etc.
Illustratively, the signal generated by taking the gradient signal as a cosine function is taken as an example, and the expression of the gradient signal may be:
as can be seen from equation 8, the ramp signal can be based on the first amplitude v n-1 Second amplitude v n And time length T of the gradation signal 1 And (5) determining. Wherein the time length of the ramp signal may be predefined. In some embodiments, the time length of the ramp function may be the same as the CP time length of the OFDM symbol, i.e., T 1 ＝T cp 。
S1710-3, the transmitting device inserts a gradation signal between adjacent square wave signals to form a first signal.
It will be appreciated that the square wave signal and the ramp signal may constitute a first signal, which may be denoted v f (τ)。
Illustratively, as shown in fig. 19, fig. 19 is a waveform schematic diagram of inserting a gradation signal between square wave signals. As can be seen from fig. 19, the insertion time length T between the square wave signals shown in fig. 18 cp Consists of a first signal as shown in fig. 19.
S1710-4, the transmitting device integrates the first signal to obtain a first phase signal.
Exemplary, the transmitting device may transmit a first signal v f (tau) integrating to obtain a first phase signal
S1710-5, the transmitting device determines the FSK signal according to the first phase signal.
Specifically, the transmitting device may determine the FSK signal from the first phase signal. Illustratively, the transmitting device may determine the FSK signal in the manner as shown in equation 9.
H in equation 9 is a constant and may be referred to as a modulation factor. As can be seen from equation 9, the FSK signal can be based on the first signal v f (tau) determining that the value of the parameter is,
s1720, the transmitting device transmits the FSK signal. Correspondingly, the receiving device receives the FSK signal.
S1730, the reception apparatus demodulates the FSK signal according to the third frequency.
It should be appreciated that the receiving device, upon receipt of the FSK signal, may be based on the frequency of the signal (i.e., the third frequency). The third frequency is in direct proportion to the amplitude of the square wave signal, and the FSK signal is demodulated by adopting a demodulation technology, so that information to be transmitted can be obtained.
In the embodiment of the application, the gradual change signal is inserted between the square wave signals, so that the frequency is smoothly converted from the frequency of the previous signal to the frequency of the current signal, frequency mutation is avoided, and interference of the signals on adjacent frequency bands in the transmission process can be reduced.
Corresponding to the methods given by the above method embodiments, the embodiments of the present application also provide corresponding apparatuses, where the apparatuses include corresponding modules for performing the above method embodiments. The module may be software, hardware, or a combination of software and hardware. It will be appreciated that the technical features described in the method embodiments described above are equally applicable to the device embodiments described below.
Fig. 20 is a schematic block diagram of an apparatus for signal processing according to an embodiment of the present application.
The apparatus 2000 may be provided in the transmitting device or the receiving device described in the above embodiments, for example.
For example, as shown in fig. 20, the apparatus 2000 includes a transceiver unit 2010, and the transceiver unit 2010 can communicate with the outside. The transceiver unit 2010 may also be referred to as a communication interface or a communication unit. The apparatus 2000 may further comprise a processing unit 2020 for performing data processing.
Optionally, the apparatus 2000 may further include a storage unit, where the storage unit may be configured to store instructions and/or data, and the processing unit 2020 may read the instructions and/or data in the storage unit.
In an implementation manner, the apparatus 2000 may be configured to perform the actions performed by the transmitting device in the above method embodiment, where the apparatus 2000 may be the transmitting device or a component configurable in the transmitting device, the transceiver unit 2010 is configured to perform the operations related to the transceiver on the transmitting device side in the above method embodiment, and the processing unit 2020 is configured to perform the operations related to the processing on the transmitting device side in the above method embodiment.
In some embodiments, the transceiver 2010 is configured to transmit a first symbol; the processing unit 2020 is configured to modulate a phase of a second symbol according to a first phase, a second frequency, and a second duration, where the second symbol is a symbol subsequent to the first symbol, the first phase is a phase at the end of the first symbol, the second frequency is a transmission frequency used by the second symbol, and the second duration is a duration of a cyclic prefix of the second symbol; the transceiver 2010 is further configured to transmit a modulated second symbol using the second frequency, where a phase between the modulated second symbol and the first symbol is continuous.
Optionally, the processing unit 2020 is further configured to: determining a third phase according to the first phase, the second frequency and the second duration; the modulation symbols are determined from the third phase.
In other embodiments, the transceiver 2010 is configured to transmit a first symbol; the processing unit 2020 is configured to generate a frequency gradual change signal according to a first phase, a first frequency and a second frequency, where the first phase is a phase when the first symbol ends, the first frequency is a transmission frequency used by the first symbol, the second frequency is a transmission frequency used by the second symbol, and the second symbol is a symbol subsequent to the first symbol; the transceiver 2010 is further configured to transmit a third symbol, where the third symbol includes the frequency-graded signal and the second symbol, the second symbol is connected to the first symbol through the frequency-graded signal, and a frequency between the third symbol and the first symbol is continuous.
In still other embodiments, the processing unit 2020 is configured to generate the frequency shift keying FSK signal according to a square wave signal, a first amplitude and a second amplitude, where the square wave signal is mapped by data to be transmitted, the data to be transmitted includes first data and second data, the first data is adjacent to the second data in transmission order, the first amplitude is the amplitude mapped by the first data, and the second amplitude is the amplitude mapped by the second data; the transceiver unit 2010 is used to transmit FSK signals.
In another implementation manner, the apparatus 2000 may be configured to perform the actions performed by the receiving device in the above method embodiment, where the apparatus 2000 may be the receiving device or a component configurable in the receiving device, the transceiver unit 2010 is configured to perform the operations related to the receiving device side in the above method embodiment, and the processing unit 2020 is configured to perform the operations related to the processing on the receiving device side in the above method embodiment.
Illustratively, the transceiver 2010 is configured to receive a second symbol; the processing unit 2020 is configured to demodulate the second symbol according to a second frequency.
A more detailed description of the apparatus 2000 may be directly obtained by referring to the related description in the above method embodiments, and will not be repeated herein.
It should also be appreciated that the apparatus 2000 herein is embodied in the form of functional units. The term "unit" herein may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it will be understood by those skilled in the art that the apparatus 2000 may be specifically a terminal device in the foregoing embodiments, and may be used to execute each flow and/or step corresponding to the terminal device in the foregoing method embodiments, which is not described herein for avoiding repetition.
The apparatus 2000 of each of the above embodiments has a function of implementing the corresponding steps performed by the device (e.g., the terminal device or the network device) in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions; for example, the transceiver unit may be replaced by a transceiver (e.g., a transmitting unit in the transceiver unit may be replaced by a transmitter, a receiving unit in the transceiver unit may be replaced by a receiver), and other units, such as a processing unit, etc., may be replaced by a processor, to perform the transceiver operations and related processing operations in the various method embodiments, respectively.
The transceiver 2010 may be a transceiver circuit (e.g., may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit.
It should be noted that the apparatus in fig. 20 may be a network element or a device in the foregoing embodiment, or may be a chip or a chip system, for example: system on chip (SoC). The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.
Fig. 21 is a schematic block diagram of another communication device provided in an embodiment of the present application. The apparatus 2100 comprises a processor 2110, the processor 2110 being coupled to a memory 2120, the memory 2120 being for storing computer programs or instructions and/or data, the processor 2110 being for executing the computer programs or instructions stored by the memory 2120 or for reading data stored by the memory 2120 for performing the methods in the method embodiments above.
In some embodiments, the processor 2110 is one or more.
In some embodiments, memory 2120 is one or more.
In some embodiments, the memory 2120 is integrated with the processor 2110 or provided separately.
In some embodiments, as shown in fig. 21, the apparatus 2100 further includes a transceiver 2130, the transceiver 2130 being used for the reception and/or transmission of signals. For example, the processor 2110 is configured to control the transceiver 2130 to receive and/or transmit signals.
Alternatively, the apparatus 2100 is configured to implement operations performed by a device (e.g., a terminal device, and also a network device) in the above method embodiments.
For example, the processor 2110 is configured to execute computer programs or instructions stored in the memory 2120 to implement the relevant operations of the network device in the above method embodiments.
As another example, the processor 2110 is configured to execute a computer program or instructions stored in the memory 2120 to implement the relevant operations of the terminal device in the above method embodiments.
It should be appreciated that the processors referred to in the embodiments of the present application may be central processing units (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It should also be understood that the memories mentioned in the embodiments of the present application may be volatile memories and/or nonvolatile memories. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM). For example, RAM may be used as an external cache. By way of example, and not limitation, RAM includes the following forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).
It should be noted that when the processor is a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) may be integrated into the processor.
It should also be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Embodiments of the present application also provide a computer readable storage medium having stored thereon computer instructions for implementing the method performed by the device (e.g., the terminal device, and also e.g., the network device) in the above method embodiments.
For example, the computer program, when executed by a computer, enables the computer to implement the method performed by the network device in the above-described method embodiments.
As another example, the computer program when executed by a computer may enable the computer to implement the method performed by the terminal device in the above-described method embodiments.
Embodiments of the present application also provide a computer program product containing instructions that, when executed by a computer, implement a method performed by an apparatus (e.g., a terminal device, and also e.g., a network device) in the above method embodiments.
The embodiment of the application provides a communication system, which comprises a sending device and a receiving device, and is used for executing the technical scheme in the embodiment. The implementation principle and technical effects are similar to those of the related embodiments of the method, and are not repeated here.
The embodiment of the application provides a chip for executing instructions, and when the chip runs, the technical scheme in the embodiment is executed. The implementation principle and technical effect are similar, and are not repeated here.
The explanation and beneficial effects of the related content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (20)

1. A method of signal processing, comprising:
transmitting a first symbol;
modulating the phase of a second symbol according to a first phase, a second frequency and a second duration, wherein the second symbol is a symbol after the first symbol, the first phase is the phase when the first symbol ends, the second frequency is the transmission frequency used by the second symbol, and the second duration is the duration of the cyclic prefix of the second symbol;
and transmitting a modulated second symbol by using the second frequency, wherein the phase between the modulated second symbol and the first symbol is continuous.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the first phase is determined according to a second phase, a first frequency and a first time length, the second phase is the phase of the first symbol, the first frequency is a transmission frequency used by the first symbol, and the first time length is the remaining time length of the time length of dividing the cyclic prefix by the first symbol.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the first phase is the same as a second phase, which is the phase of the first symbol.
4. A method according to any one of claims 1 to 3, characterized in that the second frequency is determined from data currently to be transmitted.
5. The method according to any of claims 1 to 4, wherein the first symbol and the second symbol are orthogonal frequency division multiplexing, OFDM, symbols.
6. A method of signal processing, comprising:
transmitting a first symbol;
generating a frequency gradual change signal according to a first phase, a first frequency and a second frequency, wherein the first phase is a phase when the first symbol ends, the first frequency is a transmission frequency used by the first symbol, the second frequency is a transmission frequency used by a second symbol, and the second symbol is a symbol after the first symbol;
and transmitting a third symbol, wherein the third symbol comprises the frequency gradual change signal and the second symbol, the second symbol is connected with the first symbol through the frequency gradual change signal, and the frequency between the third symbol and the first symbol is continuous.
7. The method of claim 6, wherein the step of providing the first layer comprises,
the frequency taper signal is determined from a frequency taper sequence determined from an instantaneous frequency function and the first phase, the instantaneous frequency function being derived from a taper frequency function, the taper frequency function being determined from the first frequency, the second frequency and the duration of the cyclic prefix of the second symbol.
8. The method according to claim 6 or 7, wherein,
the first phase is determined according to a second phase, the first frequency and a first duration, the second phase is the phase of the first symbol, and the first duration is the remaining duration of the first symbol divided by a cyclic prefix.
9. The method according to claim 6 or 7, wherein,
the first phase is the same as a second phase, which is the phase of the first symbol.
10. The method of claim 7, wherein the ramp frequency function comprises any one of: cosine function, deformation function of cosine function, hyperbolic tangent function.
11. The method according to any of claims 6 to 10, wherein the first symbol and the second symbol are orthogonal frequency division multiplexing, OFDM, symbols.
12. A method of signal processing, comprising:
generating a Frequency Shift Keying (FSK) signal according to a square wave signal, a first amplitude and a second amplitude, wherein the square wave signal is obtained by mapping data to be transmitted, the data to be transmitted comprises first data and second data, the first data are adjacent to the transmission sequence of the second data, the first amplitude is the amplitude obtained by mapping the first data, and the second amplitude is the amplitude obtained by mapping the second data;
And sending the FSK signal.
13. The method of claim 12, wherein the step of determining the position of the probe is performed,
the FSK signal is determined from a first phase signal which is integrated from a first signal comprising the square wave signal and a ramp signal which is determined from the first amplitude, the second amplitude and the time length of the ramp signal.
14. The method of claim 13, wherein the FSK signal satisfies the following equation:
wherein s is FSK (t) the FSK signal at time t, v f (τ) represents the first signal, h being a constant.
15. The method according to any of claims 12 to 14, characterized in that the square wave signal is mapped from the data to be transmitted by:
mapping every N bits in the data to be transmitted into an amplitude according to a preset mapping table;
determining the square wave signal according to the mapped amplitude;
where n=log 2 M, M is the modulation order of the FSK signal, and N is a natural number.
16. An apparatus for signal processing, characterized by comprising means or units for performing the method of any of claims 1 to 5, or comprising means or units for performing the method of any of claims 6 to 11, or comprising means or units for performing the method of any of claims 12 to 15.
17. An apparatus for signal processing, comprising a processor for executing a computer program or instructions stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 5, or to cause the apparatus to perform the method of any one of claims 6 to 11, or to cause the apparatus to perform the method of any one of claims 12 to 15.
18. A computer readable storage medium, having stored thereon a computer program or instructions which, when run on a computer, cause the computer to perform the method of any of claims 1 to 5 or cause the computer to perform the method of any of claims 6 to 11 or cause the computer to perform the method of any of claims 12 to 15.
19. A computer program product, characterized in that it comprises a computer program or instructions for performing the method according to any of claims 1 to 5, or for performing the method according to any of claims 6 to 11, or for performing the method according to any of claims 12 to 15.
20. A chip, characterized in that the chip is coupled to a memory for reading and executing program instructions stored in the memory for implementing the method according to any one of claims 1 to 5, or for implementing the method according to any one of claims 6 to 11, or for implementing the method according to any one of claims 12 to 15.
CN202211415615.1A 2022-08-26 2022-11-11 Signal processing method and device Pending CN117639998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2023/114214 WO2024041522A1 (en) 2022-08-26 2023-08-22 Signal processing method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211033204 2022-08-26
CN2022110332046 2022-08-26

Publications (1)

Publication Number Publication Date
CN117639998A true CN117639998A (en) 2024-03-01

Family

ID=90030933

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211415615.1A Pending CN117639998A (en) 2022-08-26 2022-11-11 Signal processing method and device

Country Status (1)

Country Link
CN (1) CN117639998A (en)

Similar Documents

Publication Publication Date Title
CN110891312B (en) Information sending method, information receiving method and device
US10749726B2 (en) Reference signal for pi/2 binary phase shift keying (BPSK) modulation
EP3488641A1 (en) Efficient concurrent transmission of a wake-up signal and user data
CN109802908B (en) Sequence-based signal processing method, signal processing apparatus, and computer-readable storage medium
CN109391431A (en) A kind of method, apparatus and computer readable storage medium obtaining reference signal
CN113439413B (en) Method for generating low PAPR sequence in wireless communication system and apparatus therefor
US20100177726A1 (en) Method and system for synchronization and cell identification within communication systems
CN113439412A (en) Method for transmitting demodulation reference signal for uplink data in wireless communication system and apparatus for the same
CN112511285A (en) Signal processing method and device based on sequence
CN108809583B (en) Method and device for transmitting signals
CN109587092B (en) Signal processing method and device based on sequence
US20210212079A1 (en) Signal transmission method, terminal device, and network device
CN117639998A (en) Signal processing method and device
WO2024041522A1 (en) Signal processing method and apparatus
CN116266806A (en) Communication method and device
CN111865517B (en) Method and device for transmitting reference signal
WO2019095863A1 (en) Pucch transmission method, terminal, and network side device
WO2021105546A1 (en) Reducing peak to average power ratio in wireless communication systems
WO2024041504A1 (en) Communication method and device
US20210135913A1 (en) A first network node and a method therein for generation and transmission of a binary phase shift keying (bpsk) signal
WO2018137219A1 (en) Information transmission method and apparatus
WO2023083037A1 (en) Signal transmission method and apparatus
WO2023078358A1 (en) Communication method and device
WO2022262532A1 (en) Symbol transmission method and communication apparatus
WO2024055878A1 (en) Communication method and communication apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication