Signal generation method and apparatus, and communication system

Abstract

The present application relates to the technical field of wireless communications and terminals, and relates to a signal generation method and apparatus, and a communication system. The method comprises: performing DFT transform precoding and / or least squares (LS) optimization on a plurality of waveforms to be processed to obtain frequency domain signals corresponding to said waveforms, wherein the plurality of waveforms to be processed comprise at least two waveforms to be processed having different phases, and the waveforms to be processed are generated by processing on-off keying (OOK) waveforms to be approximated generated on the basis of a low-power wake-up signal (LP-WUS); and on the basis of the frequency domain signals, acquiring a target frequency domain signal having the same frequency domain bandwidth as the LP-WUS. According to the present application, a plurality of waveforms to be processed having different phases can be generated on the basis of OOK waveforms to be approximated corresponding to an LP-WUS; and by performing frequency domain repeated mapping on the waveforms to be processed having different phases, the frequency diversity gain of the LP-WUS is improved, so that the LP-WUS has strong anti-fading capability, and the detection rate and detection accuracy of the LP-WUS are improved.

Description

Signal generation method, device, and communication system

[0001] This disclosure is based on the Chinese patent application with application number 202310914728.4, application date July 24, 2023, and invention name “Signal Generation Method, Device, and Communication System”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0002] The present application relates to the field of wireless communications and terminal technologies, and in particular to a signal generation method, a signal generation device, and a communication system. Background Art

[0003] In the field of wireless communications, in the new radio (NR) system, when there is no data service, the terminal can enter a dormant state, such as an idle state (Idle) or an inactive state (Inactive), to reduce the power consumption level of the terminal and achieve the purpose of saving energy. When there is data service, the base station can wake up the terminal through a low-power wake-up signal (Low-Power Wake-Up Signal, LP-WUS), instructing the terminal to resume from the dormant state to the working state, such as the connected state, thereby completing the sending and receiving of data services.

[0004] It should be noted in the related art that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a signal generation method, a signal generation device, a computer-readable storage medium and an electronic device.

[0007] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0008] According to a first aspect of the present application, a signal generation method is provided, comprising: performing DFT transform precoding or least squares (LS) optimization on a plurality of waveforms to be processed to obtain frequency domain signals corresponding to the waveforms to be processed; wherein the plurality of waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on a first signal; and obtaining a target frequency domain signal having the same frequency domain bandwidth as the first signal based on the frequency domain signal.

[0009] According to a second aspect of the present application, a signal generating device is provided, comprising: a signal processing module for performing DFT transform precoding or least squares LS optimization on a plurality of waveforms to be processed to obtain a frequency domain signal corresponding to the waveforms to be processed; wherein the plurality of waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on a first signal; and a signal acquisition module for acquiring, based on the frequency domain signal, a target frequency domain signal having the same frequency domain bandwidth as the first signal.

[0010] According to the third aspect of the present application, a communication system is provided, including: a base station, used to perform DFT transform precoding or least squares LS optimization on multiple waveforms to be processed to obtain frequency domain signals corresponding to the waveforms to be processed; wherein the multiple waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on a first signal; based on the frequency domain signal, a target frequency domain signal with the same frequency domain bandwidth as the first signal is obtained; a user terminal, including a wake-up signal receiver and a main wireless module; the wake-up signal receiver is used to perform envelope detection on the received target transmitted signal, obtain the first signal, and wake up the main wireless module according to the first signal; the main wireless module is used to communicate wirelessly with the base station.

[0011] According to a fourth aspect of the present application, a computer storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the signal generation method described above is implemented.

[0012] According to a fifth aspect of the present application, an electronic device is provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the above-mentioned signal generation method by executing the executable instructions.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0015] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0016] FIG1 schematically shows a system architecture diagram of a communication system to which a signal generation method is applied in an embodiment of the present application.

[0017] FIG2 schematically shows a flow chart of a signal generation method in an embodiment of the present application.

[0018] FIG3 schematically shows a schematic diagram of the OFDM baseband signal processing principle in an embodiment of the present application.

[0019] FIG4 schematically illustrates a method for acquiring waveforms to be processed with different phases in an embodiment of the present application.

[0020] 5A-5D schematically illustrate an interface diagram for performing equal-length interception of waveforms to be processed with different phases corresponding to an OFDM symbol in an embodiment of the present application.

[0021] FIG6 schematically shows a structural diagram of a signal generating device in an embodiment of the present application.

[0022] FIG7 schematically shows a block diagram of a computer system structure of an electronic device suitable for implementing an embodiment of the present application. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0024] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0025] The terms "a", "an", "the" and "said" are used in this specification to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first" and "second" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0026] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0027] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0028] Among the related technologies in this field, Release 18 proposes a new topic for optimizing terminal device power consumption - low-power wake-up signal LP-WUS. It aims to further reduce the power of monitoring paging during DRX (Discontinuous Reception) by designing a simple modulation signal and a simple receiver. This allows the UE to further save energy in the idle / inactive state without incurring large transmission delays. This is very beneficial for the future deployment of UEs in vertical industries that do not have sustainable energy sources, such as sensors and alarms.

[0029] To reduce UE power consumption, the UE is equipped with a main radio module (MR) and a wake-up signal receiver separate from the MR. The MR, similar to the NR UE in related technologies, is used for signal transmission and reception, and has high power consumption, typically in the milliwatt (mW) range. The wake-up signal receiver has lower power consumption, typically in the microwatt (μW) or even nanowatt (nW) range. When the wake-up signal receiver detects a wake-up signal, it activates the MR to implement basic UE functions, including radio resource management (RRM) measurements, paging, cell reselection and cell handover, as well as various application (app) layer functions.

[0030] The NR reception in the related art is based on the OFDM receiver. When demodulating, an accurate crystal oscillator or OFDM demodulator is required for demodulation. The signal processing process is complex and will result in high power consumption. In order to reduce power consumption, a simple modulation signal and a simple receiver can be designed. Therefore, the LP-WUS signal sent by the base station is usually converted into a binary keying signal for transmission, such as OOK (On-Off Keying) or FSK (Frequency Shift Keying). Among them, OOK is more widely used. Compared with FSK, OOK can only use limited simple devices for envelope detection and does not require a crystal oscillator. Therefore, multi-carrier OOK technology is usually used to modulate the LP-WUS signal to generate an NR signal to better coexist with other NR signals.

[0031] There are four mainstream OOK schemes in the related art: OOK-Option 1, OOK-Option 2, OOK-Option 3, and OOK-Option 4. OOK-Option 4 is a predistortion method that pregenerates a waveform and then uses operations similar to the discrete Fourier transform (DFT) to approximate the target waveform. This method offers the dual advantages of speed and performance. Because OOK-Option 4 is an approximation method, it allows for arbitrary configuration of the time domain waveform by setting the corresponding number of signals carried on each OFDM symbol, thereby achieving high-speed and high-performance signal transmission.

[0032] However, the main problem with the spectrum generated by OOK-Option 4 is that, to perfectly represent the "ON" waveform in the time domain, many consecutive sampling points are required to produce the same "ON" input. Excessive in-phase signals in the time domain lead to spikes in the frequency domain, and the frequency domain energy is too concentrated in the first half of the spectrum. In common 3GPP fast-fading channel scenarios, such as TDL-C 300ns, the vast majority of the energy is lost, causing complete waveform distortion at the receiver. Because the receiver uses envelope detection, the decision device cannot distinguish between high-level and low-level waveforms, regardless of the signal-to-noise ratio. This results in low LP-WUS signal detection accuracy and efficiency. Furthermore, the frequency domain energy in the second half of the spectrum is too low, making a minimal contribution to the overall performance, resulting in very low spectral efficiency.

[0033] As mentioned above, the NR reception in the related art is based on an OFDM (Orthogonal Frequency Division Multiplexing) receiver, which demodulates the LP-WUS signal through an accurate crystal oscillator or OFDM demodulator. However, the signal processing process of the OFDM receiver, crystal oscillator, and OFDM demodulator is complex, which will result in high power consumption. In addition, when the waveform carrying the LP-WUS signal has too many in-phase signals in the time domain, it will cause spikes in the frequency domain. If a channel with strong frequency selectivity is encountered, once the spike falls into the deep attenuation region, the entire signal loses a lot of energy, making it difficult to distinguish the LP-WUS signal, thereby reducing the detection accuracy and efficiency of the LP-WUS signal.

[0034] In response to the technical problems existing in the related art, a signal generation method is proposed in an embodiment of the present application. The OOK waveform to be approximated corresponding to the LP-WUS signal generated based on the OOK-Option 4 scheme is repeated and phase-transformed to obtain multiple waveforms to be processed with different phases. The multiple waveforms to be processed are then subjected to DFT transformation precoding and LS optimization, and the target frequency domain signal is obtained based on the obtained frequency domain signal for mapping to enhance the frequency diversity gain of the LP-WUS signal. This ensures that when the signal passes through a frequency selective fading channel, at least one peak is unaffected, and the signal has an envelope that can be distinguished from noise. This enables the MR to be awakened in 3GPP engineering application scenarios, thereby achieving the design requirements of power saving and improving spectrum efficiency.

[0035] Before describing the technical solutions in the embodiments of the present application in detail, the technical terms that may be involved in the embodiments of the present application are first explained and illustrated.

[0036] (1) LP-WUS: Low-Power Wake-Up Signal, used to wake up the main radio module MR in the UE.

[0037] (2) OOK: On-Off Keying, also known as binary amplitude shift keying (2ASK), uses a unipolar non-return-to-zero code sequence to control the on and off of a sinusoidal carrier.

[0038] (3) OOK-Option 4: A scheme for performing OOK modulation on the LP-WUS signal. It is a pre-distortion method that pregenerates a waveform and then approaches the target waveform through discrete Fourier transform or least squares optimization.

[0039] (4) DFT transform: Discrete Fourier Transform is the most basic method of signal analysis. It transforms the signal from the time domain to the frequency domain, and then studies the spectral structure and change law of the signal.

[0040] (5)LS optimization: Least Square, least squares optimization method.

[0041] (6) IFFT transform: Inverse Fast Fourier Transform, inverse fast Fourier transform.

[0042] After introducing the technical terms that may be involved in the embodiments of this application, the signal generation method in this application is described in detail.

[0043] FIG1 schematically shows a system architecture block diagram of a communication system applying the technical solution of the present application.

[0044] As shown in Figure 1, the system architecture 100 of the communication system may include a base station 101, an NR terminal 102 and a network, wherein the base station 101 is used to generate an LP-WUS signal and perform OOK modulation, phase transformation, time-frequency transformation and frequency domain repetitive mapping on the LP-WUS signal to obtain a target transmission signal for sending to the NR terminal; the wake-up signal receiver in the NR terminal 102 is used to receive the target transmission signal transmitted through the multipath fading channel, demodulate and envelope detect the received target transmission signal, obtain the LP-WUS signal, and send the LP-WUS signal to the main wireless module in the NR terminal 102 to wake up the main wireless module; the network is a communication network, which is used to provide a data transmission link between the base station 101 and the NR terminal 102.

[0045] The technical solution provided in the embodiment of the present application can be applied to a base station, where an LP-WUS signal is generated and subjected to modulation, phase rotation, time-frequency conversion, and frequency domain repetitive mapping.

[0046] The signal generation method in this application can be applied to any scenario involving generating an LP-WUS signal and using the LP-WUS signal to wake up the main wireless module. The signal generation method provided in this application is described in detail below in conjunction with the implementation methods in some embodiments.

[0047] FIG2 shows a flow chart of a signal generation method, which is applied to a base station, which may be the base station 101 in FIG1 . As shown in FIG2 , the signal generation method includes:

[0048] Step S210: performing DFT transform precoding or least squares LS optimization on waveforms to be processed with different phases to obtain a frequency domain signal corresponding to the waveform to be processed; wherein the waveform to be processed is generated by processing a waveform generated based on the first signal.

[0049] In some embodiments, the first signal may be a low power wake-up LP-WUS signal, and the waveform generated based on the first signal may be an OOK waveform to be approximated based on the LP-WUS signal.

[0050] In other embodiments, the waveform to be processed generated by processing the waveform generated based on the first signal can also be applied to a passive Internet of Things.

[0051] In the embodiment of the present disclosure, the first signal is an LP-WUS signal, and the waveform to be processed is generated by processing an OOK waveform generated based on the LP-WUS signal. However, the present invention is not limited thereto.

[0052] Step S220: Acquire a target frequency domain signal having the same frequency domain bandwidth as the first signal based on the frequency domain signal.

[0053] The signal generation method of the present application repeats and phase-shifts the OOK waveform to be approximated generated based on the LP-WUS signal to obtain a waveform to be processed with a different phase, then performs DFT transform precoding or least squares optimization on the waveform to be processed with a different phase to obtain a frequency domain signal corresponding to the waveform to be processed, and then obtains a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal based on all frequency domain signals. The signal generation method of the present application can, on the one hand, improve the frequency diversity gain of the LP-WUS signal by repeating and phase-shifting the OOK waveform to be approximated generated based on the LP-WUS signal, and performing frequency domain repetitive mapping according to the frequency domain signal corresponding to the phase-shifted waveform to be processed, so as to obtain a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal. This ensures that when the LP-WUS signal passes through a frequency selective fading channel, at least one peak is not affected and has an envelope that can be distinguished from noise, thereby ensuring that the receiving end can detect the LP-WUS signal through envelope detection; on the other hand, it ensures that the wake-up signal receiver can wake up the MR in time, meeting the requirements of power-saving design.

[0054] In the field of 5G and 5G+ mobile communications, signals are usually transmitted in a multi-carrier waveform, and the multi-carrier waveform is usually implemented based on the orthogonal frequency division multiplexing technology OFDM. OFDM is a type of multi-carrier modulation. It realizes parallel transmission of high-speed serial data through frequency division multiplexing. It has good resistance to multipath fading and can support multi-user access. Therefore, before explaining the signal generation method in this application in detail, the orthogonal frequency division multiplexing technology OFDM is first briefly explained.

[0055] Figure 3 schematically illustrates the principle of OFDM baseband signal processing. As shown in Figure 3, the signal processing process is divided into the transmitter (base station) signal processing process and the receiver (UE) signal processing process. At the transmitter, the bit stream is first modulated with QAM or QPSK. It then undergoes serial-to-parallel conversion and IFFT transformation, converting the parallel data into serial data. A guard interval (also known as a cyclic prefix) is added to form an OFDM symbol. During framing, a synchronization sequence and a channel estimation sequence are added to facilitate burst detection, synchronization, and channel estimation at the receiver. Finally, an orthogonal baseband signal is output. At the receiver, upon signal arrival, synchronization and channel estimation are first performed. After time synchronization, fractional frequency offset estimation, and correction are completed, the signal is subjected to FFT transformation and integer frequency offset estimation and correction. The resulting data is QAM or QPSK modulated data. Finally, this data is demodulated to obtain the bit stream.

[0056] In an exemplary embodiment of the present application, the essence of performing serial-to-parallel conversion on the LP-WUS signal is to divide the LP-WUS signal into multiple signal blocks. In some embodiments, the division can be performed according to the number of bits carried by each OFDM symbol. After the serial-to-parallel conversion is completed, each signal block can be time-domain expanded and OOK modulation can be performed according to the OOK-Option 4 scheme to generate an OOK waveform to be approximated. The OOK waveform to be approximated is then repeated and phase-transformed. The multiple waveforms to be processed with different phases are then subjected to time-frequency conversion to obtain corresponding frequency domain signals. Finally, a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal is obtained based on all frequency domain signals, and the target frequency domain signal is mapped to the corresponding RE in the OFDM modulator. This is the modulation mapping process shown in Figure 3. Considering that at the transmitter, when OOK-Option 4 is used to perform OOK modulation on the bit stream, many consecutive sampling points are required to generate the same "ON" input to produce a perfect "ON" waveform in the time domain. However, excessive in-phase signals in the time domain will cause spikes in the frequency domain. When encountering a highly frequency-selective channel, once the spike falls into the deep fade region, the entire signal loses a lot of energy, making it difficult to distinguish it using envelope detection. Therefore, in the modulation mapping process, the approximate OOK waveform is repeated and phase-shifted to form multiple processed waveforms with different phases. The frequency domain signals corresponding to these processed waveforms with different phases are spliced ​​to obtain the target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal. This ensures that as long as not all bandwidths fall within the channel deep fade point, at least one frequency domain peak is not affected, and an envelope that can be distinguished from noise is maintained. This ensures that the signal ultimately transmitted to the receiver has high frequency diversity gain, maintains good performance even in frequency-selective fading channels, and improves the detection rate of LP-WUS signals.

[0057] Next, each step of the signal generating method shown in FIG2 is described in detail.

[0058] In step S210, DFT transform precoding or least squares LS optimization is performed on the waveform to be processed with different phases to obtain a frequency domain signal corresponding to the waveform to be processed; wherein, the waveform to be processed is generated by processing the OOK waveform of the binary keying signal to be approximated generated based on the low-power wake-up LP-WUS signal.

[0059] In an exemplary embodiment of the present application, Figure 4 schematically shows a method for obtaining waveforms to be processed with different phases. As shown in Figure 4, in step S401, after obtaining the LP-WUS signal, the OOK waveform to be approximated is first generated based on the LP-WUS signal; in step S402, the OOK waveform to be approximated is repeated according to a preset number to generate multiple OOK waveforms to be processed; in step S403, each OOK waveform to be processed is phase transformed according to different frequency domain mapping positions to obtain multiple waveforms to be processed with different phases.

[0060] Among them, in step S401, the OOK waveform to be approximated is generated based on the LP-WUS signal. In some embodiments, it can be implemented according to the following method: first, the number of bits contained in the LP-WUS signal is rate matched according to the number of bits that can be carried by an orthogonal frequency division multiplexing OFDM symbol to divide the LP-WUS signal into multiple signal blocks; then, each signal block is time-domain expanded and OOK modulated to obtain the OOK waveform to be approximated corresponding to each signal block. In some embodiments, when the LP-WUS signal is divided into multiple signal blocks, the number of bits contained in the LP-WUS signal is rate matched according to the number of bits that can be carried by each OFDM symbol. For example, the bit stream corresponding to the LP-WUS signal is b(0), b(1), ..., b(M bit -1), the number of bits included is M bit , the number of bits that each OFDM symbol can carry is Then we can generate signal blocks, i.e. Each of these signal blocks is a signal block, and these signal blocks are processed in parallel during the modulation mapping process. Since the processing flow of each signal block is the same, in the embodiment of the present application, only the modulation processing flow of one signal block is described.

[0061] In an exemplary embodiment of the present application, after acquiring a signal block, the signal block may be time-domain expanded and OOK modulated to generate an OOK waveform to be approximated. When the signal block is time-domain expanded, the expansion may be performed based on the number of sampling points required for subsequent time-frequency conversion of the waveform to be processed. In an embodiment of the present application, after the OOK waveform to be approximated is repeated and phase-transformed to obtain multiple waveforms to be processed with different phases, DFT transform precoding or LS optimization is used to process each waveform to be processed. Therefore, the signal block may be time-domain expanded based on the number of DFT sampling points and the number of LS optimization sampling points.

[0062] When the DFT sampling point number is used for expansion, the sampling point number can be set to the frequency domain bandwidth size of the LP-WUS signal. This avoids the need to truncate the frequency domain signal according to the frequency domain bandwidth size of the LP-WUS signal after completing the DFT transform precoding. When the frequency domain bandwidth size of the LP-WUS signal is smaller than the maximum number of carrying bits corresponding to the OFDM symbol, the portion of the OFDM symbol not covered by the extended signal is padded with zeros.

[0063] When LS optimized sampling points are used for expansion, the sampling points can be set to any value between the frequency domain bandwidth of the LP-WUS signal and the maximum number of bits carried by the OFDM symbol. For example, the FFT sampling points can be used for expansion to fill the signal bits in the OFDM symbol. Alternatively, other sampling points can be selected to perform time domain expansion on the signal block. When the signal bits in the OFDM symbol are not filled, zeros are still used to fill the part of the OFDM symbol not covered by the extended signal.

[0064] In an exemplary embodiment of the present application, when a signal block is time-domain expanded, each bit in the signal block is expanded by the same multiple, for example, one OFDM symbol is allocated to bits, the number of sampling points to be expanded is Then each bit needs to be expanded to In the embodiment of the present application, the extended signal block is marked as For ease of understanding, let's take an example to illustrate. When the signal block allocated to an OFDM symbol is 1101, if you want to expand the signal block to the LP-WUS signal bandwidth size of 72, then each bit needs to be expanded to 18 bits. In other words, the extended signal block is composed of 18 1s, 18 1s, 18 0s, and 18 1s in sequence.

[0065] After obtaining the extended signal block, the extended signal block can be modulated using the OOK-Option 4 scheme to generate an OOK waveform to be approximated corresponding to the extended signal block. It is worth noting that since one signal block corresponds to one OFDM symbol, the OOK waveform to be approximated corresponding to the signal block also corresponds to one OFDM symbol.

[0066] In an exemplary embodiment of the present application, in order to ensure that the target transmission signal generated based on the LP-WUS signal has good performance when passing through a frequency-selective fading channel, and to ensure that the receiving UE can detect the LP-WUS signal by means of envelope detection, in an embodiment of the present application, multiple waveforms to be processed with different phases corresponding to the OOK waveform to be approximated can be obtained, and frequency domain repeated mapping can be performed according to the frequency domain signals corresponding to the multiple waveforms to be processed, so that the target frequency domain signal includes multiple frequency domain peak signals corresponding to the OOK waveform to be approximated. Then, as long as not all bandwidths are located in the deep fading region of the channel with strong frequency selectivity, there will be at least one frequency domain peak signal that will not be affected and has an envelope that can be distinguished from noise, thereby ensuring that the receiving UE can detect the LP-WUS signal by means of envelope detection.

[0067] For step S402, after obtaining the OOK waveform to be approximated, the OOK waveform to be approximated can be repeated according to a preset number to generate multiple OOK waveforms to be processed, that is, the number of OOK waveforms to be processed is equal to the preset number, and the OOK waveform to be processed is exactly the same as the OOK waveform to be approximated. Among them, the preset number can be set according to actual needs. The larger the preset number, the greater the frequency diversity gain. In the embodiment of the present application, the preset number is an integer multiple of the frequency domain bandwidth size of the LP-WUS signal and does not exceed the frequency domain bandwidth size of the LP-WUS signal. It is worth noting that the preset number cannot be too large to prevent the subsequent interception of the frequency domain signal from failing to fully obtain the part where the frequency domain energy is concentrated, thereby affecting the accuracy of the detection result of the receiving UE.

[0068] For step S403, after repeatedly obtaining multiple OOK waveforms to be processed from the approximated OOK waveform, each OOK waveform to be processed can be phase-shifted according to different frequency domain mapping positions to obtain multiple waveforms to be processed with different phases. When performing phase shift, different OOK waveforms to be processed correspond to different starting frequency domain mapping positions, and the starting frequency domain mapping position is related to the index corresponding to the OOK waveform to be processed. Therefore, the starting frequency domain mapping position corresponding to each OOK waveform to be processed can be determined first, and then the phase shift sequence corresponding to the OOK waveform to be processed can be determined based on the starting frequency domain mapping position. Finally, the corresponding OOK waveform to be processed is phase-shifted according to the phase shift sequence to obtain the waveform to be processed.

[0069] In an exemplary embodiment of the present application, when determining the starting frequency domain mapping position corresponding to each OOK waveform to be processed, the starting frequency domain mapping position corresponding to each OOK waveform to be processed can be determined according to the starting frequency domain mapping position corresponding to the OOK waveform to be processed with an index of 0, the index corresponding to each OOK waveform to be processed, the preset number for repeating the approximated OOK waveform, and the frequency domain bandwidth size of the LP-WUS signal. For example, when the preset number is Q, Q is a positive integer greater than 1, the starting frequency domain mapping position corresponding to the OOK waveform to be processed with an index of 0 is k c When , first, the Q to-be-processed OOK waveforms can be repeatedly obtained according to a preset number Q of the to-be-processed OOK waveforms, and then the corresponding indexes can be set for the Q to-be-processed OOK waveforms. In some embodiments, they can be numbered in the order of 0, 1, 2…Q-1, and then the starting frequency domain mapping position corresponding to each to-be-processed OOK waveform can be determined according to the preset number, the starting frequency domain mapping position corresponding to the to-be-processed OOK waveform with index 0, the index of the to-be-processed OOK waveform, and the frequency domain bandwidth of the LP-WUS signal. For example, for the to-be-processed OOK waveform with index i, As the corresponding starting frequency domain mapping position, correspondingly, for the OOK waveform to be processed with index 1, the starting frequency domain mapping position is For the OOK waveform to be processed with index (Q-1), the starting frequency domain mapping position is Where R is the frequency domain bandwidth of the LP-WUS signal. It is worth noting that the starting frequency domain mapping position in this application is any RE in the corresponding OFDM symbol.

[0070] After determining the starting frequency domain mapping position corresponding to each OOK waveform to be processed, the starting frequency domain mapping position, phase transformation basis The phase shift factor corresponding to each bit is determined by the position index of each bit in each OOK waveform to be processed, and then the phase shift sequence corresponding to the OOK waveform to be processed is determined based on the phase shift factors corresponding to all bits in the OOK waveform to be processed. For example, when the position index of a bit in the OOK waveform to be processed is m (0≤m≤(N-1), where N is the total number of bits in the OOK waveform to be processed), the phase shift factor corresponding to the bit is

[0071] After obtaining the phase transformation factors corresponding to all bits in the OOK waveform to be processed with index i, all phase transformation factors can be sorted according to the position index corresponding to each bit, and then the phase transformation sequence corresponding to the OOK waveform to be processed with index i can be obtained, that is, i=0,1,…,(Q-1), m=0,1,…,(N-1), N is the total number of bits contained in the OOK waveform to be processed. The phase transformation sequence is expanded into a sequence form, that is: It is worth noting that the phase transformation factors in the phase transformation sequence corresponding to each waveform to be processed are continuous, but the phase transformation sequences corresponding to two adjacent waveforms to be processed are not continuous, but partially overlap.

[0072] In an exemplary embodiment of the present application, the corresponding OOK waveform to be processed can be phase-transformed according to a phase transformation sequence to obtain the waveform to be processed after phase transformation. In some embodiments, the phase transformation factor in the phase transformation sequence is applied to the bits with the same position index in the OOK waveform to be processed to obtain the waveform to be processed.

[0073] In the field of signal processing, the phase transformation of a waveform is achieved based on mathematical operations. Different mathematical operations are used for different transformation dimensions. In the embodiments of the present application, the phase transformation of the OOK waveform to be processed can be divided into waveform transformation dimensions and signal transformation dimensions. Accordingly, the mathematical operation corresponding to the waveform transformation dimension can use matrix-level operations, and the mathematical operation corresponding to the signal transformation dimension can use signal-level operations. Next, different transformation dimensions and corresponding mathematical operations are described in detail.

[0074] (1) Waveform transformation dimension

[0075] In an exemplary embodiment of the present application, when a matrix-level phase transformation is performed on the OOK waveform to be processed according to the phase transformation sequence, the waveform to be processed, the phase transformation sequence, and the OOK waveform to be processed satisfy the relationship (1):

[0076] in, is the matrix representation of the waveform to be processed; is the phase transformation sequence corresponding to the i-th OOK waveform to be processed; is the matrix representation of the i-th OOK waveform to be processed; i is the index of the OOK waveform to be processed; R is the frequency domain bandwidth of the LP-WUS signal; Q is the number of OOK waveforms to be processed, which is a positive integer greater than 1; k c The index of the starting frequency domain mapping position of the OOK waveform to be processed with index 0; is the phase transformation basis; N is the total number of bits contained in the OOK waveform to be processed.

[0077] It is worth noting that since one OOK waveform to be approximated corresponds to one OFDM symbol, then the multiple OOK waveforms to be processed formed by repeating the OOK waveform to be approximated also correspond to one OFDM symbol. Therefore, based on formula (1), phase transformation can be performed on the multiple OOK waveforms to be processed corresponding to one OFDM symbol. When the LP-WUS signal is divided into Z (Z is a positive integer greater than 1) signal blocks according to the number of bits carried by an OFDM symbol, and the number of repetitions corresponding to each OOK waveform to be approximated is Q (Q is a positive integer greater than 1), then Z×Q operations can be performed according to formula (1) to obtain the waveforms to be processed corresponding to all OOK waveforms to be approximated.

[0078] (2) Signal transformation dimension

[0079] In an exemplary embodiment of the present application, the phase of the corresponding OOK waveform to be processed is transformed according to the phase transformation sequence, which is essentially to apply the phase transformation factor in the phase transformation sequence to the signal in the extended signal block corresponding to the OFDM symbol to perform phase transformation on the signal.

[0080] When the phase transformation of the OOK waveform to be processed is performed at the signal level according to the phase transformation sequence, the waveform to be processed, the phase transformation sequence and the OOK waveform to be processed satisfy the relationship (2):

[0081] in, is the signal in the waveform to be processed; is the signal in the OOK waveform to be processed; is the phase change sequence corresponding to the OFDM symbol indexed as 1; i' is the position index corresponding to each signal on the OFDM symbol; k is the number of bits contained in the extended signal block corresponding to an OFDM symbol; c The index of the starting frequency domain mapping position of the OOK waveform to be approximated is 0.

[0082] In an exemplary embodiment of the present application, after performing phase transformation on multiple OOK waveforms to be processed according to different phase transformation sequences to obtain multiple waveforms to be processed with different phases, DFT transform precoding or LS optimization can be performed on the waveforms to obtain frequency domain signals corresponding to the waveforms to be processed. Furthermore, a target transmit signal to the UE can be generated based on the frequency domain signal.

[0083] In the exemplary embodiments of the present application, similar to performing phase transformation on the processed OOK waveform, DFT transform precoding or LS optimization can also be divided into matrix-level operations and signal-level operations. Since matrix-level DFT transform precoding is a commonly used signal transformation method in the field, it is not described in detail in the embodiments of the present application. Next, only the matrix-level LS optimization scheme, the signal-level DFT transform precoding scheme, and the signal-level LS optimization scheme are described in detail.

[0084] (1) Matrix-level LS optimization scheme

[0085] Before describing the LS optimization scheme in the embodiment of the present application, the existing OOK waveform generation method based on LS optimization is first briefly described.

[0086] OOK waveform generation based on LS optimization is divided into a non-shifting basic generation method and a shifting extended generation method. Among them, the LS optimized approximate expression corresponding to the non-shifting basic generation method is shown in formula (3):

[0087] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse Fourier transform matrix,

[0088] G is the interception matrix,

[0089] b n For extended signal blocks.

[0090] Expanding the approximation after LS optimization, we get the expression shown in (4):

[0091] Expression (4) is a very typical FFT transformation. The elements in each matrix are constructed by different FFT orthogonal bases, so the final DFT transformation result will be obtained. At the same time, the truncation matrix G is composed of an L-long square matrix and all 0s, aiming to extract the elements of the target bandwidth length L, and the remaining 0s in the result will be discarded in the mapping. Since the bandwidth is only L long, corresponding to the number of elements contained in the final column vector, it is equivalent to b n The FFT transform of n points is shortened to L length through this LS optimization.

[0092] Based on the shiftable extended generation method, the LS optimization mapping of different frequency domain positions is achieved by using the phase transformation factor. The approximate expression of the LS optimization corresponding to the shiftable extended generation method is shown in formula (5):

[0093] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse matrix of Fourier transform; G is the intercept matrix; b n is the extended signal block; s w is the phase change sequence of the current bit based on the mapping position, k c is the starting position of frequency domain mapping.

[0094] The starting position of the frequency domain mapping is also the starting RE of the frequency domain mapping. The starting RE can be any RE on any RB. For example, when k c = 0, the starting position of the frequency domain mapping is the 0th RE on the RB. c =3, then the starting position of the frequency domain mapping is the third RE on the RB, and so on. c =0, the calculation result in expression (4) can be obtained according to formula (5), as shown in expression (6):

[0095] According to formula (5), by changing k c , the phase can be moved, then the appropriate generation phase can be selected for the Fourier transform matrix to offset the pre-distortion phase, so that the result still becomes the FFT effect based on LS optimization, as shown in expression (7):

[0096] For the shiftable extension generation method described above, although a good approximation effect can be achieved, the spectrum energy is too concentrated. When passing through a channel with strong frequency selectivity, once the peak falls into the deep attenuation area, most of the energy will be lost, causing the waveform at the receiving end to be completely distorted. In view of this, after obtaining multiple waveforms to be processed corresponding to an OFDM symbol, formula (5) can be used to perform time-frequency conversion on each waveform to be processed to obtain the frequency domain signal corresponding to each waveform to be processed, and then the target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal is obtained based on the frequency domain signal corresponding to each waveform to be processed. The expression of the frequency domain signal corresponding to the waveform to be processed with index i and obtained after LS optimization is shown in formula (8):

[0097] in, is the frequency domain signal sequence corresponding to the i-th waveform to be processed, Each element in is a frequency domain signal mapped to different resource elements RE; is the interception matrix constructed according to the frequency domain bandwidth of the LP-WUS signal; F inv is the inverse Fourier transform matrix; F invThe conjugate transposed matrix of ; is the phase transformation sequence corresponding to the i-th OOK waveform to be processed; is the phase transformation basis; N is the number of sampling points, k c is the index of the starting frequency domain mapping position of the OOK waveform to be processed with index 0. The starting frequency domain mapping position can be on any RE of any resource block RB.

[0098] By expanding formula (8), we can get the frequency domain signal after LS optimization as shown in formula (9):

[0099] Among them, the rightmost sequence is the generated frequency domain signal corresponding to each waveform to be processed, where each signal is a signal mapped to a different RE on the same OFDM symbol. Since the frequency domain signals corresponding to all the waveforms to be processed with different phases need to be intercepted and spliced ​​after obtaining them, only part of the frequency domain signal intercepted from the frequency domain signal corresponding to the waveform to be processed is mapped to different RE on the same OFDM symbol. From the expression of the analysis signal, it can be seen that each signal has different phase information. For example, the phase information corresponding to the 0th bit signal is 1, and the phase information corresponding to the 1st bit signal is The phase information corresponding to the second signal is The phase information corresponding to the R-1th bit signal is

[0100] Based on formula (9), the frequency domain signals corresponding to the Q waveforms to be processed can be obtained. In some embodiments:

[0101] The frequency domain signal corresponding to the waveform to be processed with index 0 is:

[0102] The frequency domain signal corresponding to the waveform to be processed with index 1 is:

[0103] The frequency domain signal corresponding to the waveform to be processed with index Q-1 is:

[0104] From the expression of the analysis signal, we can know that each signal has different starting position information. For example, the 0th bit signal on the OOK waveform to be processed at the 0th index means that the Fourier matrix starts from the kth bit. c Starting from the position, it means that in the frequency domain mapping, only the frequency domain signal generated on the right is mapped to the kth item in the frequency domain starting from the 0th item. c And then the corresponding positions, that is, the 0th item in the frequency domain signal is mapped to the index k c On the RE of the frequency domain signal, the first item is mapped to the index k c+1 RE, and so on, the waveform after OFDM signal modulation is the correct OOK waveform; similarly, the 0th bit signal on the OOK waveform to be processed at the first index means that the Fourier matrix starts from the kth c +R / Q position starts, which means that in the frequency domain mapping, only the right side generated signal is mapped from the 0th item to the kth item in the frequency domain. c +R / Q and the corresponding positions thereafter, the waveform after being modulated by the OFDM signal is the correct OOK waveform; similarly, the 0th bit signal on the OOK waveform to be processed for the i-th index means that the Fourier matrix is ​​from the k-th c +iR / Q position starts, which means that in the frequency domain mapping, only the right side generated signal is mapped from the 0th item to the kth item in the frequency domain. c +iR / Q and the corresponding positions thereafter, the waveform after being modulated by the OFDM signal is the correct OOK waveform.

[0105] (2) Signal-level DFT transform precoding scheme

[0106] The matrix-level LS optimization scheme is a scheme for processing the waveform to be processed corresponding to the OFDM symbol. Considering that the essence of processing the waveform to be processed corresponding to the OFDM symbol is to process each signal in the waveform to be processed, in order to clearly understand the technical solution of the present application, the method of performing signal-level processing on the waveform to be processed with different phases to obtain the corresponding frequency domain signal in the embodiment of the present application is explained below.

[0107] In an exemplary embodiment of the present application, the corresponding frequency domain signal can be obtained by performing DFT transform precoding or LS optimization on the signal in the waveform to be processed with different phases. When performing DFT transform precoding, the number of sampling points of DFT transform precoding is the same as the bandwidth, that is, the number of time domain points is the same as the number of frequency domain points. In some embodiments, DFT transform precoding can be performed according to formula (10):

[0108] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; is the phase-shifted signal block corresponding to the lth OFDM symbol; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0109] In an exemplary embodiment of the present application, according to formula (11), only one set (l, k) needs to be determined each time to obtain the frequency domain signal generated by DFT transform precoding corresponding to the kth RE in the OFDM symbol with index l. For example, let l = 1, k = k c When +R / Q, the kth OFDM symbol mapped to index 1 can be calculated according to formula (10). c The frequency domain signal expression on the +R / Q bit RE is:

[0110] It is worth noting that the coefficients in formula (10) The function of is to correct the deviation in the frequency domain signal generation process to ensure that the generated frequency domain signal is closer to the real signal.

[0111] (3) Signal-level LS optimization solution

[0112] In an exemplary embodiment of the present application, when the LS optimization scheme is used to perform time-frequency conversion of a signal, the number of sampling points is greater than or equal to the bandwidth size. That is, the number of frequency domain points can be equal to or greater than the number of time domain points. In an embodiment of the present application, LS optimization can be performed according to formula (11), which is as follows in some embodiments:

[0113] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to LS; is the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor; is the phase-shifted signal block corresponding to the lth OFDM symbol; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0114] In an exemplary embodiment of the present application, similar to the DFT transform precoding scheme, according to formula (11), only a unique set of (l, k) needs to be determined each time to obtain the frequency domain signal generated by LS optimization corresponding to the kth RE in the OFDM symbol with index l, and the frequency domain signal corresponds to the frequency domain signal in the frequency domain signal sequence shown in formula (9). For example, take l = 1, k = k c When +R / Q, the kth OFDM symbol mapped to index 1 can be calculated according to formula (11). c The frequency domain signal expression on the +R / Q bit RE is:

[0115] It is worth noting that the power control factor β in formula (11) is used to ensure the signal-to-noise ratio (Signal

[0116] The average value of the SNR (Signal to Noise Ratio) or S / N (Signal to Noise Ratio) is the same as the signal-to-noise ratio in the physical downlink shared channel (PDSCH). Furthermore, it can also be used to ensure that the average value of the signal-to-interference ratio (SIR) is the same as the signal-to-interference ratio in the PDSCH, and the average value of the signal-to-interference and noise ratio (SINR) is the same as the signal-to-interference and noise ratio in the PDSCH.

[0117] In the above embodiments, a matrix-level LS optimization scheme, a signal-level DFT transform precoding scheme, and a signal-level LS optimization scheme are described. These optimization schemes all have the same purpose: to convert the time-domain signal corresponding to the waveform to be processed into a frequency-domain signal. Since the number of time-domain points in the LS optimization scheme can be greater than the number of frequency-domain bandwidth points, and the greater the number of time-domain points, the better the approximation effect, the LS optimization scheme can better approximate the original OOK waveform to be approximated, compared to the DFT transform precoding scheme for signal processing, and thus achieves better performance.

[0118] In step S220, a target frequency domain signal having the same frequency domain bandwidth as that of the LP-WUS signal is acquired based on the frequency domain signal.

[0119] In an exemplary embodiment of the present application, in step S210, DFT transform precoding or LS optimization is performed on waveforms to be processed with different phases. After obtaining frequency domain signals corresponding to each waveform to be processed, all frequency domain signals corresponding to an OFDM symbol can be intercepted and spliced ​​to obtain a target frequency domain signal corresponding to the OFDM symbol and having a size equal to the frequency domain bandwidth of the LP-WUS signal. The target frequency domain signal is the frequency domain signal mapped to the OFDM modulator. When intercepting the frequency domain signal, since the first half of the frequency domain signal is where the frequency domain energy is concentrated, the second half has very low frequency domain energy, making a very small contribution to the overall performance and also easily resulting in very low spectral efficiency, when intercepting the frequency domain signal, the header of the frequency domain signal can be intercepted, and then the intercepted target frequency domain signal segments are spliced ​​to obtain a target frequency domain signal having a size equal to the frequency domain bandwidth of the LP-WUS signal.

[0120] In an exemplary embodiment of the present application, the target frequency domain signal segments corresponding to each waveform to be processed can be cut with equal or unequal lengths, under the premise of ensuring that the size of the target frequency domain signal finally spliced ​​is the same as the frequency domain bandwidth of the LP-WUS signal. If the approximated OOK waveform is repeated to form Q OOK waveforms to be processed, when cutting the target frequency domain signal segments of equal lengths, the frequency domain signal of the head 1 / Q part of each waveform to be processed can be cut to form the target frequency domain signal segment; when cutting the target frequency domain signal segments of unequal lengths, the head of each waveform to be processed can be cut with unequal lengths according to a preset rule, wherein the preset rule can be that the sum of the lengths of the target frequency domain signal segments corresponding to multiple adjacent waveforms to be processed is equal, for example, the sum of the lengths of the target frequency domain signal segments corresponding to two adjacent waveforms to be processed is equal, etc. Of course, other rules can also be used, as long as the size of the target frequency domain signal is ensured to be the same as the size of the frequency domain signal of the LP-WUS signal. The embodiment of the present application does not make specific limitations on this.

[0121] In the exemplary embodiments of the present application, similar to performing phase transformation on the OOK waveform to be processed and performing DFT transformation precoding or LS optimization on the waveform to be processed with a different phase obtained by the phase transformation, performing head interception on each waveform to be processed to obtain the target frequency domain signal segment can also be divided into matrix-level operations and signal-level operations. Similarly, since matrix-level DFT transform precoding is a commonly used signal transformation method in this field, this is not explained in detail in the embodiments of the present application. Next, only the matrix-level interception scheme corresponding to the matrix-level LS optimization scheme, the signal-level interception scheme corresponding to the signal-level DFT transform precoding, and the signal-level interception scheme corresponding to the signal-level LS optimization scheme are described in detail. It is worth noting that in the embodiments of the present application, only the scheme of how to perform equal-length interception on the frequency domain signal of the waveform to be processed is described.

[0122] (1) Matrix-level truncation scheme corresponding to the matrix-level LS optimization scheme

[0123] When the frequency domain signal of the head 1 / Q part of each waveform to be processed is intercepted to form the target frequency domain signal segment, the first 1 / Q part of each frequency domain signal is intercepted to obtain the intercepted frequency domain signal segment, and then the target frequency domain signal segment is obtained according to the power control factor β and the power coefficient. The intercepted frequency domain signal segment is processed to obtain the target frequency domain signal segment. Among them, the power control factor β is the same as β in formula (11) and will not be repeated here. The power coefficient It is used to ensure that the power of the target frequency domain signal corresponding to each frequency domain signal segment is equal to the power of the OOK waveform to be approximated.

[0124] Taking formula (9) as an example, the intercepted frequency domain signal segment obtained by interception based on formula (9) and the index of the waveform to be processed, the frequency domain signal corresponding to the waveform to be processed, and the number of waveforms to be processed satisfy the relationship (12):

[0125] Then, according to the power control factor β and power coefficient The intercepted frequency domain signal segment shown in formula (13) is processed to obtain a target frequency domain signal segment. The target frequency domain signal segment and the intercepted frequency domain signal segment satisfy the relationship formula (13):

[0126] in, is the target frequency domain signal segment; X i is the frequency domain signal segment to be intercepted; i is the index of the waveform to be processed; Q is the number of waveforms to be processed; R is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase transformation basis, N is the number of sampling points; k c is the index of the starting frequency domain mapping position corresponding to the 0th waveform to be processed.

[0127] (2) Signal-level interception scheme corresponding to signal-level DFT transform precoding

[0128] Based on the DFT transform precoding of the waveform to be processed as shown in formula (10), the corresponding frequency domain signal is obtained, and the first 1 / Q part of the target frequency domain signal segment can be intercepted for the frequency domain signal. When intercepting the first 1 / Q part of the target frequency domain signal segment for each frequency domain signal, the index k of the RE position can be limited according to 1 / Q to ensure that the target frequency domain signal segment with a length of 1 / Q of the total length of the frequency domain signal is obtained through DFT transform precoding. In some embodiments, the target frequency domain signal segment and the index of the OFDM symbol, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the relationship (14):

[0129] Where y(·) is the frequency domain signal in the target frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; is the phase-transformed signal block corresponding to the OFDM symbol indexed as l; Q is the total number of frequency-domain signals generated by DFT transform precoding; m is the index of the frequency-domain signal corresponding to the OFDM symbol indexed as l; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0130] Comparing formula (10) and formula (14), it can be seen that the only difference between the two is that formula (14) uses m and Q to limit the value of k. In this way, formula (14) can ensure that the target frequency domain signal segment of the first 1 / Q part of different frequency domain signals is obtained, that is, the head of the full-bandwidth frequency domain signal obtained according to formula (10) is intercepted.

[0131] (3) Signal-level interception scheme corresponding to signal-level LS optimization

[0132] Based on the LS optimization of the waveform to be processed as shown in formula (11), the corresponding frequency domain signal is obtained, and the target frequency domain signal segment of the first 1 / Q part can be intercepted for the frequency domain signal. When intercepting the target frequency domain signal segment of the first 1 / Q part for each frequency domain signal, the index k of the RE position can be limited according to 1 / Q to ensure that the target frequency domain signal segment with a length of 1 / Q of the total length of the frequency domain signal is obtained through LS optimization. In some embodiments, the target frequency domain signal segment and the index of the OFDM symbol, the RE position index on the OFDM symbol, the frequency domain bandwidth size of the LP-WUS signal, and the number of sampling points corresponding to the LS optimization satisfy the relationship (15):

[0133] Where y(·) is the frequency domain signal in the target frequency domain signal segment; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to LS; is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase-shifted signal block corresponding to the lth OFDM symbol; Q is the total number of frequency-domain signals generated by LS optimization; m is the index of the frequency-domain signal corresponding to the OFDM symbol indexed as l; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0134] Comparing formula (11) and formula (15), it can be seen that the only difference between the two is that formula (15) uses m and Q to limit the value of k. In this way, formula (15) can ensure that the target frequency domain signal segment of the first 1 / Q part of different frequency domain signals is obtained, that is, the head of the full-bandwidth frequency domain signal obtained according to formula (11) is intercepted.

[0135] In an exemplary embodiment of the present application, after completing the interception of the frequency domain signals of the waveforms to be processed with different phases, all the acquired target frequency domain signal segments can be sorted according to the starting frequency domain mapping positions corresponding to each waveform to be processed, and then spliced ​​to obtain the target frequency domain signal.

[0136] Figures 5A to 5D schematically illustrate an interface diagram for performing equal-length interception on waveforms to be processed with different phases corresponding to an OFDM symbol. As shown in Figure 5A, there are Q waveforms to be processed, each of which corresponds to a different starting frequency domain mapping position. The starting frequency domain mapping position corresponding to the 0th waveform to be processed is k. c , the starting frequency domain mapping position corresponding to the first waveform to be processed is The starting frequency domain mapping position corresponding to the i-th waveform to be processed is The starting frequency domain mapping position corresponding to the Q-1th waveform to be processed is After performing DFT transform precoding or LS optimization on the Q waveforms to be processed according to the frequency domain bandwidth of the LP-WUS signal, Q frequency domain signals can be generated, and each frequency domain signal corresponds to a different starting frequency domain mapping position, as shown in FIG5B ; then the first 1 / Q part of each frequency domain signal can be intercepted to obtain the target frequency domain signal segment, as shown in FIG5C ; finally, the Q target frequency domain signal segments are spliced ​​according to the corresponding starting frequency domain mapping positions to obtain the target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal, as shown in FIG5D .

[0137] In an exemplary embodiment of the present application, after acquiring the target frequency domain signal, a target transmission signal may be generated based on the target frequency domain signal. The target transmission signal is a signal including an LP-WUS signal sent to the UE.

[0138] Among them, when generating a target transmitting signal based on the target frequency domain signal, the frequency domain signal corresponding to the RE on each OFDM symbol generated by the DFT transform precoding scheme or the LS optimization scheme can be input into the OFDM modulator and mapped to the RE in the OFDM modulator. Then, the received frequency domain signal is OFDM modulated by the OFDM modulator to obtain a target OOK waveform that approximates the OOK waveform to be approximated. Furthermore, the target transmitting signal can be constructed according to the target OOK waveform. Continuing with the OFDM baseband signal processing principle diagram shown in Figure 3 as an example, after all signal blocks corresponding to the LP-WUS signal are processed according to the above embodiment to generate corresponding frequency domain signals, the frequency domain signals can be mapped to different REs in the OFDM modulator, and then the frequency domain signals corresponding to different signal blocks are subjected to frequency domain-time domain conversion processing. For example, the Inverse Fast Fourier Transform (IFFT) method can be used to perform frequency domain-time domain conversion processing to obtain a time domain signal corresponding to the input frequency domain signal. Then, the time domain signals corresponding to different signal blocks can be parallel-to-serial converted, and the time domain signals corresponding to different signal blocks can be spliced ​​in sequence to obtain the target OOK waveform. Finally, in order to ensure the security of signal transmission, a protection interval can be added to the target OOK waveform, such as padding the protection interval with zeros or adding a cyclic prefix to avoid inter-symbol interference. At this point, the target transmitted signal can be obtained.

[0139] In an exemplary embodiment of the present application, after acquiring the target transmit signal, the target transmit signal can be transmitted to the UE via a multipath fading channel. After receiving the target transmit signal, the wake-up signal receiver in the UE can perform envelope detection on the target transmit signal to obtain the LP-WUS signal. The wake-up signal receiver processes the target transmit signal in the same manner as the receiving end processing flow shown in FIG3 , and this embodiment of the present application will not be further described here.

[0140] The signal generation method in the embodiment of the present application performs phase transformation on multiple OOK waveforms to be processed corresponding to the OOK waveform to be approximated according to different phase rotation sequences to obtain multiple waveforms to be processed with different phases. The waveforms to be processed with different phases are then subjected to DFT transform precoding or LS optimization to obtain corresponding frequency domain signals. Finally, the frequency domain signals are intercepted and spliced ​​to obtain a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal. Since only the energy-concentrated head of the frequency domain signal is intercepted during interception, the target frequency domain signal obtained by splicing the intercepted frequency domain signal segments expands the bandwidth of the main energy portion of the LP-WUS signal, thereby improving the frequency diversity gain of the LP-WUS signal. When the target transmitted signal passes through a multipath fading channel or a channel with strong frequency selectivity, as long as not all bandwidths are located at the deep fade point of the channel, at least one frequency domain peak will not be affected, and the target signal has an envelope that can be distinguished from noise. This ensures that after the UE receives the LP-WUS signal, it can detect the LP-WUS signal through the envelope detection method, thereby improving the detection rate and detection accuracy of the LP-WUS signal.

[0141] Furthermore, the wake-up signal receiver can wake up the main radio module MR in the UE according to the demodulated LP-WUS signal, ensuring signal synchronization between the MR and the base station, realizing basic functions of the UE, and achieving the purpose of saving energy consumption.

[0142] The present application further provides a signal generating device. FIG6 shows a schematic structural diagram of the signal generating device. The signal generating device 600 is configured in a base station. As shown in FIG6 , the signal generating device 600 may include a signal processing module 601 and a signal acquisition module 602. In some embodiments:

[0143] The signal processing module 601 is configured to perform DFT transform precoding or least squares optimization on waveforms to be processed with different phases to obtain a frequency domain signal corresponding to the waveform to be processed; wherein the waveform to be processed is generated by processing an OOK waveform to be approximated based on a low-power wake-up LP-WUS signal;

[0144] The signal acquisition module 602 is configured to acquire a target frequency domain signal having the same frequency domain bandwidth as the LP-WUS signal based on the frequency domain signal.

[0145] In an exemplary embodiment of the present application, the signal generating device 600 includes: an OOK modulation module, which is used to generate the OOK waveform to be approximated based on the LP-WUS signal before performing DFT transform precoding or least squares LS optimization on the waveform to be processed with different phases; a repetition module, which is used to repeat the OOK waveform to be approximated according to a preset number to generate multiple OOK waveforms to be processed; and a phase transformation module, which is used to perform phase transformation on each of the OOK waveforms to be processed according to different frequency domain mapping positions to obtain multiple waveforms to be processed with different phases.

[0146] In an exemplary embodiment of the present application, the OOK modulation module includes: a rate matching unit, configured to perform rate matching on the number of bits contained in the LP-WUS signal according to the number of bits that can be carried by an orthogonal frequency division multiplexing (OFDM) symbol, so as to divide the LP-WUS signal into multiple signal blocks; and a modulation unit, configured to perform time domain expansion and OOK modulation on each of the signal blocks, so as to obtain an OOK waveform to be approximated corresponding to each of the signal blocks.

[0147] In an exemplary embodiment of the present application, the modulation unit includes: a processing unit, used to perform time domain expansion on the signal block according to the number of sampling points corresponding to DFT transform precoding or LS optimization, and perform OOK modulation on the extended signal block obtained by the time domain expansion to obtain the OOK waveform to be approximated.

[0148] In an exemplary embodiment of the present application, the processing unit is configured as follows: when performing DFT transform precoding on the waveform to be processed, time domain expansion is performed on the signal blocks corresponding to each of the OFDM symbols according to the number of sampling points corresponding to the bandwidth size of the LP-WUS signal, and the portion of the OFDM symbol not covered by the extended signal is filled with zeros; when performing LS optimization on the waveform to be processed, time domain expansion is performed on the signal blocks corresponding to each of the OFDM symbols according to the number of sampling points corresponding to the LS optimization, and the portion of the OFDM symbol not covered by the extended signal is filled with zeros.

[0149] In an exemplary embodiment of the present application, the preset number is smaller than the frequency domain bandwidth of the LP-WUS signal and is a multiple of the frequency domain bandwidth of the LP-WUS signal.

[0150] In an exemplary embodiment of the present application, the phase transformation module includes: a sequence determination unit, used to determine the starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed, and determine the phase transformation sequence corresponding to the OOK waveform to be processed according to the starting frequency domain mapping position; a phase transformation unit, used to perform phase transformation on the corresponding OOK waveform to be processed according to the phase transformation sequence to obtain the waveform to be processed; wherein the starting frequency domain mapping position is any RE in the OFDM symbol, and the phase transformation factors in the phase transformation sequence are continuous.

[0151] In an exemplary embodiment of the present application, the sequence determination unit is configured to: determine the starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed according to the starting frequency domain mapping position corresponding to the OOK waveform to be processed with index 0, the index corresponding to each of the OOK waveforms to be processed, the preset number and the frequency domain bandwidth size of the LP-WUS signal; determine the starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed according to the phase transformation basis; The starting frequency domain mapping position corresponding to the OOK waveform to be processed and the position index of each bit in the OOK waveform to be processed determine the phase transformation factor corresponding to each bit in the OOK waveform to be processed; and the phase transformation sequence is constructed according to all phase transformation factors corresponding to the OOK waveform to be processed.

[0152] In an exemplary embodiment of the present application, the phase transformation unit is configured as follows: the waveform to be processed, the phase transformation sequence, and the OOK waveform to be processed satisfy the relationship (1):

[0153] in, is a matrix representation of the waveform to be processed; is the phase transformation sequence corresponding to the i-th OOK waveform to be processed; is the matrix representation of the i-th OOK waveform to be processed; i is the index of the OOK waveform to be processed; R is the frequency domain bandwidth of the LP-WUS signal; Q is the number of OOK waveforms to be processed, which is a positive integer greater than 1; k c The index of the starting frequency domain mapping position of the OOK waveform to be processed with index 0; is the phase transformation basis; N is the total number of bits contained in the OOK waveform to be processed.

[0154] In an exemplary embodiment of the present application, the phase transformation unit is configured as follows: the waveform to be processed, the phase transformation sequence, and the OOK waveform to be processed satisfy the relationship (2):

[0155] in, is the signal in the waveform to be processed; is the signal in the OOK waveform to be processed; is the phase change sequence corresponding to the OFDM symbol with index 1; i' is the position index corresponding to each signal on the OFDM symbol; k is the number of bits contained in the extended signal block corresponding to an OFDM symbol; c is the index of the starting frequency domain mapping position of the OOK waveform to be approximated, with index 0.

[0156] In an exemplary embodiment of the present application, the signal processing module 601 is configured to perform LS optimization on the waveform to be processed according to the truncation matrix, the inverse Fourier transform matrix, and the phase transformation sequence, wherein the frequency domain signal and the waveform to be processed, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation sequence satisfy the relationship (3):

[0157] in, is the frequency domain signal sequence corresponding to the i-th waveform to be processed, Each element in is a frequency domain signal mapped to different resource elements RE; is the truncation matrix constructed according to the bandwidth of the LP-WUS signal; inv is the inverse Fourier transform matrix; F inv The conjugate transposed matrix of ; is the phase transformation sequence corresponding to the i-th OOK waveform to be processed; is the phase transformation basis; N is the number of sampling points, k c is the index of the starting frequency domain mapping position of the OOK waveform to be processed with an index of 0. The starting frequency domain mapping position can be on any RE of any resource block RB.

[0158] In an exemplary embodiment of the present application, the signal processing module 601 is configured as follows: the frequency domain signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the relationship (4):

[0159] Wherein, y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and the value ranges from Increasing in sequence; The number of sampling points corresponding to the DFT transform precoding; is the phase-shifted signal block corresponding to the lth OFDM symbol; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0160] In an exemplary embodiment of the present application, the signal processing module 601 is configured as follows: the frequency domain signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, the frequency domain bandwidth size of the LP-WUS signal, and the number of sampling points corresponding to the LS optimization satisfy the relationship (5):

[0161] Wherein, y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and the value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to the LS; is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase-shifted signal block corresponding to the lth OFDM symbol; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0162] In an exemplary embodiment of the present application, there are multiple frequency domain signals; the signal acquisition module 602 includes: a capture unit for capturing the header of each frequency domain signal to obtain a target frequency domain signal segment corresponding to each frequency domain signal; and a splicing unit for splicing all the target frequency domain signal segments in sequence to obtain the target frequency domain signal.

[0163] In an exemplary embodiment of the present application, the interception unit includes: an equal-length interception unit for intercepting the first 1 / Q part of each of the frequency domain signals to obtain the intercepted frequency domain signal segment; a power control unit for The intercepted frequency domain signal segments are processed to obtain the target frequency domain signal segments; wherein Q is the number of the OOK waveforms to be processed; the power control factor is used to ensure that the average value of the signal-to-noise ratio is the same as the signal-to-noise ratio in the physical downlink shared channel PDSCH; the power coefficient is used to ensure that the power of the target frequency domain signal corresponding to each of the frequency domain signal segments is equal to the power of the OOK waveform to be approximated.

[0164] In an exemplary embodiment of the present application, the equal-length interception unit is configured as follows: the intercepted frequency domain signal segment and the index of the waveform to be processed, the frequency domain signal corresponding to the waveform to be processed, and the number of the waveforms to be processed satisfy the relationship (6):

[0165] The power control unit is configured such that the target frequency domain signal segment and the intercepted frequency domain signal segment satisfy the relationship (7):

[0166] in, is the target frequency domain signal segment; X i is the intercepted frequency domain signal segment; i is the index of the waveform to be processed; Q is the number of waveforms to be processed; R is the frequency domain bandwidth of the LP-WUS; β is the power control factor; is the phase transformation basis, N is the number of sampling points; k c is the index of the starting frequency domain mapping position corresponding to the 0th waveform to be processed.

[0167] In an exemplary embodiment of the present application, the interception unit is configured as follows: the index of the target frequency domain signal segment and the OFDM symbol, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the relationship (8):

[0168] Wherein, y(·) is the frequency domain signal in the target frequency domain signal segment; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and the value ranges from Increasing in sequence; The number of sampling points corresponding to the DFT transform precoding; is the phase-transformed signal block corresponding to the OFDM symbol with index 1; Q is the total number of frequency-domain signals generated by DFT transform precoding; m is the index of the frequency-domain signal corresponding to the OFDM symbol with index 1; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0169] In an exemplary embodiment of the present application, the interception unit is configured as follows: the index of the target frequency domain signal segment and the OFDM symbol, the RE position index on the OFDM symbol, the bandwidth size of the LP-WUS signal in the frequency domain, and the number of sampling points corresponding to the LS optimization satisfy the relationship (9):

[0170] Wherein, y(·) is the frequency domain signal in the target frequency domain signal segment; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and the value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to the LS; is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase-transformed signal block corresponding to the lth OFDM symbol; Q is the total number of frequency-domain signals generated by the LS optimization; m is the index of the frequency-domain signal corresponding to the OFDM symbol with index 1; is the number of bits carried by an OFDM symbol during rate matching; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0171] In an exemplary embodiment of the present application, the splicing unit is configured to sort and splice all the target frequency domain signal segments according to the starting frequency domain mapping position corresponding to each target frequency domain signal segment to obtain the target frequency domain signal.

[0172] In an exemplary embodiment of the present application, the signal generating device 600 is also configured to: map the target frequency domain signal corresponding to each OFDM symbol to the RE in the OFDM modulator; perform OFDM modulation on the frequency domain signal through the OFDM modulator to obtain a target OOK waveform that approximates the OOK waveform to be approximated, and construct a target transmitting signal based on the target OOK waveform.

[0173] In an exemplary embodiment of the present application, the signal generating device 600 is further configured to: send the target transmit signal to a wake-up signal receiver in the user terminal UE through a multipath fading channel, perform envelope detection on the target transmit signal through the wake-up signal receiver to obtain the LP-WUS signal, and wake up the main wireless module based on the LP-WUS signal.

[0174] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0175] Furthermore, although the steps of the method of the present application are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0176] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0177] FIG7 schematically shows a block diagram of a computer system structure of an electronic device for implementing an embodiment of the present application. The electronic device may be provided in a base station.

[0178] It should be noted that the computer system 700 of the electronic device shown in FIG7 is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0179] As shown in Figure 7, the computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 702 or the program loaded from the storage part 708 into the random access memory (RAM) 703. Various programs and data required for system operation are also stored in the random access memory 703. The CPU 701, the read-only memory 702, and the random access memory 703 are connected to each other via a bus 704. An input / output interface 705 (i.e., an I / O interface) is also connected to the bus 704.

[0180] In some embodiments, the following components are connected to the input / output interface 705: an input section 706 including a keyboard, a mouse, and the like; an output section 707 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 708 including a hard disk and the like; and a communication section 709 including a network interface card such as a local area network card or a modem. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the input / output interface 705 as needed. A removable medium 711, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like, is installed in the drive 710 as needed so that a computer program read therefrom can be installed into the storage section 708 as needed.

[0181] In particular, according to an embodiment of the present application, the processes described in the various method flow charts can be implemented as computer software programs. For example, an embodiment of the present application includes a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for executing the methods shown in the flow charts. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 709 and / or installed from a removable medium 711. When the computer program is executed by the central processing unit 701, the various functions defined in the system of the present application are performed.

[0182] It should be noted that the computer-readable medium shown in the embodiments of the present application may be a computer-readable signal medium or a computer-readable medium or any combination of the two. The computer-readable medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. Examples of computer-readable media in some embodiments may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0183] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of the boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0184] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0185] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.) or on a network, and includes a number of instructions to enable an electronic device to execute the method according to the embodiments of the present application.

[0186] As can be seen from the above technical solutions, the signal generation method, signal generation device, computer-readable storage medium, and electronic device in the exemplary embodiments of the present application have at least the following advantages and positive effects:

[0187] The signal generation method in the embodiment of the present application, after obtaining the low-power wake-up LP-WUS signal, generates an OOK waveform of a binary keying signal to be approximated based on the LP-WUS signal, then repeats and phase-shifts the OOK waveform to be approximated to generate multiple waveforms to be processed with different phases, then performs DFT transform precoding or least squares LS optimization on the processed waveform to obtain the corresponding frequency domain signal, and finally obtains a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal based on the frequency domain signal. The signal generation method of the present application can improve the frequency diversity gain and spectral efficiency of the LP-WUS signal by repeating and phase-shifting the OOK waveform to be approximated generated based on the LP-WUS signal, and performing frequency domain repeated mapping on the frequency domain signals corresponding to the waveforms to be processed with different phases obtained by the phase transformation, thereby improving the detection accuracy and efficiency of the LP-WUS signal, improving the synchronization of NR reception, and reducing energy consumption loss.

[0188] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A signal generation method, wherein: include: Performing DFT transform precoding or least squares LS optimization on multiple waveforms to be processed to obtain frequency domain signals corresponding to the waveforms to be processed; wherein the multiple waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on the first signal; A target frequency domain signal having the same frequency domain bandwidth as that of the first signal is acquired based on the frequency domain signal.

2. The method according to claim 1, wherein: The first signal is a low power wake-up LP-WUS signal, and the waveform generated based on the first signal is an OOK waveform to be approximated binary keying signal generated based on the LP-WUS signal; The method further comprises: Generate the OOK waveform to be approximated based on the LP-WUS signal; Repeating the OOK waveform to be approximated according to a preset number to generate a plurality of OOK waveforms to be processed; Phase transformation is performed on each of the OOK waveforms to be processed according to different frequency domain mapping positions to obtain multiple waveforms to be processed with different phases.

3. The method according to claim 2, wherein: The method of generating an OOK waveform to be approximated based on the LP-WUS signal comprises: Performing rate matching on the number of bits included in the LP-WUS signal according to the number of bits that can be carried by an orthogonal frequency division multiplexing (OFDM) symbol, so as to divide the LP-WUS signal into a plurality of signal blocks; Time domain expansion and OOK modulation are performed on each of the signal blocks to obtain an OOK waveform to be approximated corresponding to each of the signal blocks.

4. The method according to claim 3, wherein: The performing time domain expansion and OOK modulation on each of the signal blocks comprises: The signal block is time-domain extended according to the number of sampling points corresponding to the DFT transform precoding or LS optimization, and the extended signal block obtained by the time-domain extension is OOK modulated to obtain the OOK waveform to be approximated.

5. The method according to claim 4, wherein: The time domain expansion of the signal block according to the number of sampling points corresponding to the DFT transform precoding or LS optimization includes: When the waveform to be processed is subjected to DFT transformation precoding, the signal blocks corresponding to each of the OFDM symbols are time-domain expanded according to the number of sampling points corresponding to the bandwidth size of the LP-WUS signal, and the parts of the OFDM symbols not covered by the extended signal are filled with zeros; When LS optimization is performed on the waveform to be processed, the signal blocks corresponding to each OFDM symbol are time-domain expanded according to the number of sampling points corresponding to the LS optimization, and the parts of the OFDM symbol not covered by the extended signal are filled with zeros.

6. The method according to claim 2, wherein: The preset number is smaller than the frequency domain bandwidth of the LP-WUS signal and is an integer multiple of the frequency domain bandwidth of the LP-WUS signal.

7. The method according to claim 2, wherein: The phase transformation of the multiple OOK waveforms to be processed according to different frequency domain mapping positions to obtain multiple waveforms to be processed with different phases includes: Determine a starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed, and determine a phase transformation sequence corresponding to the OOK waveform to be processed according to the starting frequency domain mapping position; Performing phase transformation on the corresponding OOK waveform to be processed according to the phase transformation sequence to obtain the waveform to be processed; The starting frequency domain mapping position is any resource element RE in the OFDM symbol, and the phase transformation factors in the phase transformation sequence are continuous.

8. The method according to claim 7, wherein: The determining of the starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed, and determining the phase transformation sequence corresponding to the OOK waveform to be processed according to the starting frequency domain mapping position, comprises: Determine the starting frequency domain mapping position corresponding to each of the OOK waveforms to be processed according to the starting frequency domain mapping position corresponding to the OOK waveform to be processed with index 0, the index corresponding to each of the OOK waveforms to be processed, the preset number and the frequency domain bandwidth size of the LP-WUS signal; According to the phase transformation The starting frequency domain mapping position corresponding to the OOK waveform to be processed and the position index of each bit in the OOK waveform to be processed determine the phase transformation factor corresponding to each bit in the OOK waveform to be processed; The phase transformation sequence is constructed according to all phase transformation factors corresponding to the OOK waveform to be processed.

9. The method according to claim 7 or 8, wherein: The step of performing phase transformation on the corresponding OOK waveform to be processed according to the phase transformation sequence to obtain the waveform to be processed includes: The waveform to be processed, the phase change sequence, and the OOK waveform to be processed satisfy the relationship (1): in, is a matrix representation of the waveform to be processed; is the phase change sequence corresponding to the i-th OOK waveform to be processed; is the matrix representation of the i-th OOK waveform to be processed; i is the index of the OOK waveform to be processed; R is the frequency domain bandwidth of the LP-WUS signal; Q is the number of the OOK waveforms to be processed, which is a positive integer greater than 1; k c The index of the starting frequency domain mapping position of the OOK waveform to be processed with index 0; is the phase transformation basis; N is the total number of bits contained in the OOK waveform to be processed.

10. The method according to claim 7, wherein: The step of performing phase transformation on the corresponding OOK waveform to be processed according to the phase transformation sequence to obtain the waveform to be processed includes: The waveform to be processed, the phase change sequence, and the OOK waveform to be processed satisfy the relationship (2): in, is the signal in the waveform to be processed; is the signal in the OOK waveform to be processed; is the phase change sequence corresponding to the OFDM symbol with index l; i' is The position index corresponding to each signal on the OFDM symbol; k is the number of bits contained in the extended signal block corresponding to an OFDM symbol; c is the index of the starting frequency domain mapping position of the OOK waveform to be approximated, with index 0.

11. The method according to claim 9, wherein: The performing DFT transform precoding or least squares LS optimization on the plurality of waveforms to be processed to obtain a frequency domain signal corresponding to each of the waveforms to be processed includes: The waveform to be processed is subjected to LS optimization according to the truncation matrix, the inverse Fourier transform matrix, and the phase transformation sequence, wherein the frequency domain signal and the waveform to be processed, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation sequence satisfy the relationship (3): in, is the frequency domain signal sequence corresponding to the i-th waveform to be processed, Each element in is a frequency domain signal mapped to different resource elements RE; is the truncation matrix constructed according to the frequency domain bandwidth of the LP-WUS signal; inv is the inverse Fourier transform matrix; F inv The conjugate transposed matrix of ; is the phase change sequence corresponding to the i-th OOK waveform to be processed; is the phase transformation basis; N is the number of sampling points, k c is the index of the starting frequency domain mapping position of the OOK waveform to be processed with an index of 0, and the starting frequency domain mapping position can be on any RE of any resource block RB.

12. The method according to claim 10, wherein: The performing DFT transform precoding or least squares LS optimization on a plurality of waveforms to be processed to obtain frequency domain signals corresponding to the waveforms to be processed includes: The frequency domain signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the relationship (4): Wherein, y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; The number of sampling points corresponding to the DFT transform precoding; is the phase change signal block corresponding to the lth OFDM symbol; M is the number of bits carried by an OFDM symbol during rate matching; bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

13. The method according to claim 10, wherein: The performing DFT transform precoding or least squares LS optimization on the plurality of waveforms to be processed to obtain a frequency domain signal corresponding to each of the waveforms to be processed includes: The frequency domain signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, the frequency domain bandwidth size of the LP-WUS signal, and the number of sampling points corresponding to the LS optimization satisfy the relationship (5): Wherein, y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing successively; k is the RE bit in the OFDM symbol with index l The index of the setting, the value is from i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to the LS; is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase change signal block corresponding to the lth OFDM symbol; M is the number of bits carried by an OFDM symbol during rate matching; bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

14. The method according to claim 4, wherein: The number of the frequency domain signals is multiple; The acquiring, based on the frequency domain signal, a target frequency domain signal having the same frequency domain bandwidth as the LP-WUS signal comprises: intercepting a header of each of the frequency domain signals to obtain a target frequency domain signal segment corresponding to each of the frequency domain signals; All the target frequency domain signal segments are sequentially spliced ​​to obtain the target frequency domain signal.

15. The method according to claim 14, wherein: The step of intercepting the header of each of the frequency domain signals to obtain a target frequency domain signal segment corresponding to each of the frequency domain signals includes: intercepting the first 1 / Q part of each of the frequency domain signals to obtain the intercepted frequency domain signal segment; According to the power control factor β and power coefficient Processing the intercepted frequency domain signal segment to obtain the target frequency domain signal segment; Among them, Q is the number of OOK waveforms to be processed; the power control factor is used to ensure that the average value of the signal-to-noise ratio is the same as the signal-to-noise ratio in the physical downlink shared channel PDSCH; the power coefficient is used to ensure that the power of the target frequency domain signal corresponding to each of the frequency domain signal segments is equal to the power of the OOK waveform to be approximated.

16. The method according to claim 15, wherein: The intercepting the first 1 / Q part of each of the frequency domain signals to obtain the intercepted frequency domain signal segment comprises: The index of the intercepted frequency domain signal segment and the waveform to be processed, the frequency domain signal corresponding to the waveform to be processed, and the number of the waveform to be processed satisfy the relationship (6): According to the power control factor β and the power coefficient Processing the intercepted frequency domain signal segment Processing to obtain the target frequency domain signal segment includes: The target frequency domain signal segment and the intercepted frequency domain signal segment satisfy the relationship (7): in, is the target frequency domain signal segment; X i is the intercepted frequency domain signal segment; i is the index of the waveform to be processed; R is the frequency domain bandwidth of the LP-WUS; β is the power control factor; is the phase transformation basis, N is the number of sampling points; k c is the index of the starting frequency domain mapping position corresponding to the 0th waveform to be processed.

17. The method according to claim 14, wherein: The step of intercepting the header of each of the frequency domain signals to obtain a target frequency domain signal segment corresponding to each of the frequency domain signals includes: The index of the target frequency domain signal segment and the OFDM symbol, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the relationship (8): Wherein, y(·) is the frequency domain signal in the target frequency domain signal segment; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; The number of sampling points corresponding to the DFT transform precoding; is the phase transformation signal block corresponding to the OFDM symbol with index l; Q is the total number of frequency domain signals generated by DFT transform precoding; m is the index of the frequency domain signal corresponding to the OFDM symbol with index l; M is the number of bits carried by an OFDM symbol during rate matching; bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

18. The method according to claim 14, wherein: The step of intercepting the header of each of the frequency domain signals to obtain a target frequency domain signal segment corresponding to each of the frequency domain signals includes: The target frequency domain signal segment and the index of the OFDM symbol, the OFDM symbol The RE position index, the frequency domain bandwidth of the LP-WUS signal, and the number of sampling points corresponding to the LS optimization satisfy the relationship (9): Wherein, y(·) is the frequency domain signal in the target frequency domain signal segment; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from i is the signal index in the extended signal block corresponding to the OFDM symbol with index l, and its value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to the LS; is the frequency domain bandwidth of the LP-WUS signal; β is the power control factor; is the phase transformation signal block corresponding to the lth OFDM symbol; Q is the total number of frequency domain signals generated by the LS optimization; m is the index of the frequency domain signal corresponding to the OFDM symbol with index l; M is the number of bits carried by an OFDM symbol during rate matching; bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

19. The method according to any one of claims 14 to 18, wherein: The step of sequentially splicing all the target frequency domain signal segments to obtain the target frequency domain signal includes: All the target frequency domain signal segments are sorted and spliced ​​according to the starting frequency domain mapping positions corresponding to the target frequency domain signal segments to obtain the target frequency domain signal.

20. The method according to claim 19, wherein: The method further comprises: Mapping the target frequency domain signal corresponding to each OFDM symbol to the RE in the OFDM modulator; The frequency domain signal is OFDM modulated by the OFDM modulator to obtain a target OOK waveform that is close to the OOK waveform to be approximated, and a target transmission signal is constructed according to the target OOK waveform.

21. The method according to claim 20, wherein: The method further comprises: The target transmission signal is transmitted to a wake-up signal receiver in a user terminal UE through a multipath fading channel, and the wake-up signal receiver performs envelope detection on the target transmission signal. The main wireless module receives a LP-WUS signal and wakes up the main wireless module based on the LP-WUS signal.

22. A signal generating device, wherein: include: A signal processing module, used for performing DFT transform precoding or least squares LS optimization on a plurality of waveforms to be processed to obtain frequency domain signals corresponding to the waveforms to be processed; wherein the plurality of waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on the first signal; A signal acquisition module is used to acquire a target frequency domain signal having the same frequency domain bandwidth as the first signal based on the frequency domain signal.

23. A communication system, wherein: include: A base station, configured to perform DFT transform precoding or least squares LS optimization on a plurality of waveforms to be processed, so as to obtain a frequency domain signal corresponding to the waveforms to be processed; wherein the plurality of waveforms to be processed include at least two waveforms to be processed with different phases, and the waveform to be processed is generated by processing a waveform generated based on the first signal; Acquire a target frequency domain signal having the same frequency domain bandwidth as the first signal based on the frequency domain signal; The user terminal includes a wake-up signal receiver and a main wireless module; the wake-up signal receiver is used to perform envelope detection on the received target transmission signal, obtain the first signal, and wake up the main wireless module according to the first signal; the main wireless module is used to communicate wirelessly with the base station.

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