Signal generation method and device, and communication system

Abstract

The invention belongs to the technical field of wireless communication and terminals, and relates to a signal generation method and device, communication, a system storage medium and electronic equipment. The method comprises the steps of generating a to-be-approximated binary keying signal OOK waveform based on a low-power wake-up (LP-WUS) signal, and performing phase rotation on the to-be-approximated OOK waveform by adopting a sequence comprising a plurality of phase rotation factors which have the same module value and the phase changes according to a preset rule so as to obtain a phase rotation OOK waveform. According to the LP-WUS signal processing method and the LP-WUS signal processing device, the frequency diversity gain of the LP-WUS signal can be improved by performing phase rotation on the time domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has relatively high anti-fading capability, and the detection rate and the detection accuracy of the LP-WUS signal are improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communications and terminal technologies, and in particular to a signal generating method, a signal generating device and a communication system. Background Art

[0002] In the field of wireless communications, in the new radio (NR) system, when there is no data service, the terminal can enter a sleep 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 sleep state to the working state, such as the connected state, thereby completing the sending and receiving of data services.

[0003] At present, traditional NR reception is based on OFDM (Orthogonal Frequency Division Multiplexing) receivers, which demodulate LP-WUS signals through an accurate crystal oscillator or OFDM demodulator. However, the signal processing process of OFDM receivers, crystal oscillators, and OFDM demodulators is complex, which will result in high power consumption. When there are too many in-phase signals in the time domain of the waveform carrying the LP-WUS signal, 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 area, the entire signal loses a lot of energy, and it is difficult to distinguish the LP-WUS signal, which reduces the detection accuracy and efficiency of the LP-WUS signal.

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

[0005] The purpose of the present application is to provide a signal generation method, a signal generation device, a computer-readable storage medium and an electronic device, at least to a certain extent.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0007] According to the first aspect of the present application, a signal generation method is provided, comprising: generating a binary keying signal OOK waveform to be approximated based on a low-power wake-up LP-WUS signal, and performing phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule, so as to obtain a phase-rotated OOK waveform.

[0008] According to the second aspect of the present application, a signal generating device is provided, including: a phase rotation module, used to generate an OOK waveform of a binary keying signal to be approximated based on a low-power wake-up LP-WUS signal, and to phase-rotate the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule to obtain a phase-rotated OOK waveform.

[0009] According to a third aspect of the present application, a communication system is provided, comprising: a base station, configured to generate a low-frequency wake-up LP-WUS signal, and generate a binary keying signal OOK waveform to be approximated based on the LP-WUS signal; performing phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule, so as to obtain a phase-rotated OOK waveform; performing DFT transform precoding or least squares LS optimization on the phase-rotated OOK waveform, so as to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform, and generating a target transmission signal based on the frequency domain signal; a user terminal, comprising a wake-up signal receiver and a main wireless module; the wake-up signal receiver is configured to perform envelope detection on the received target transmission signal, obtain the LP-WUS signal, and wake up the main wireless module according to the LP-WUS signal; the main wireless module is configured to perform wireless communication with the base station.

[0010] According to a fourth aspect of the present application, there is provided a computer storage medium on which a computer program is stored, characterized in that the computer program implements the above-mentioned signal generation method when executed by a processor.

[0011] According to a fifth aspect of the present application, there is provided an electronic device, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned signal generation method by executing the executable instructions.

[0012] It can be seen from the above technical solutions that the signal generating method, signal generating 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:

[0013] 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, and then uses a sequence of phase rotation factors having the same modulus and phases changing in a preset pattern to perform phase rotation on the OOK waveform to be approximated, so as to obtain a phase-rotated OOK waveform. The signal generation method of the present application can improve the detection accuracy and efficiency of the LP-WUS signal by performing phase rotation on the OOK waveform to be approximated generated based on the LP-WUS signal, thereby improving the synchronization of NR reception and reducing energy consumption losses.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are incorporated into the specification 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 for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The system architecture diagram of the communication system using the signal generation method in the embodiment of the present application is schematically shown.

[0017] Figure 2 The flowchart of the signal generation method in the embodiment of the present application is schematically shown.

[0018] Figure 3 The schematic diagram shows the principle diagram of OFDM baseband signal processing in an embodiment of the present application.

[0019] Figure 4 The flowchart of determining a sequence for performing phase rotation according to a phase change pattern that changes at a preset interval in an embodiment of the present application is schematically shown.

[0020] Figure 5 The flowchart of determining a sequence for performing phase rotation according to a phase change pattern that changes at a preset interval in an embodiment of the present application is schematically shown.

[0021] Figure 6 The signal interface diagram after phase rotation of the high potential waveform in the OOK waveform to be approximated is schematically shown based on the sequence determined by the preset interval amount 1 in the embodiment of the present application.

[0022] Figure 7The signal interface diagram after the phase rotation of the OOK waveform to be approximated based on the sequence determined by the preset interval amount 1 in the embodiment of the present application is schematically shown.

[0023] Figure 8 The signal interface diagram after phase rotation of a high potential waveform approaching an OOK waveform based on a sequence determined based on a preset interval 5 in an embodiment of the present application is schematically shown.

[0024] Fig. 9 The signal interface diagram after phase rotation of the high potential waveform in the OOK waveform to be approximated is schematically shown based on the sequence determined by the preset interval amount 1 and the preset repetition amount 2 in the embodiment of the present application.

[0025] Fig.10 The structural diagram of the signal generating device in the embodiment of the present application is schematically shown.

[0026] Fig.11 The structure block diagram of a computer system suitable for implementing an electronic device of an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0028] 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 to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate 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, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0029] 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 an 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.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0032] In the related technologies in this field, Release 18 proposes a new topic on power consumption optimization of terminal equipment - low-power wake-up signal LP-WUS, which aims to further reduce the power of monitoring paging during DRX (Discontinuous Reception) by designing simple modulation signals and simple receivers, so that UE can further save energy in the idle IDLE / inactive INACTIVE state without causing a large transmission delay, which is very beneficial for the deployment of UEs without sustainable energy sources in future vertical industries, such as sensors, alarms, etc.

[0033] In order to reduce the power consumption of UE, a main wireless module MR and a wake-up signal receiver separated from MR are provided in UE. MR is similar to the function of traditional NR UE, used for sending and receiving signals, and is in a closed or deep sleep state most of the time, with high power consumption, generally in the order of milliwatts (mW), while the power consumption of the wake-up signal receiver is lower, generally in the order of microwatts (μW) or even nanowatts (nW). When the wake-up signal receiver detects the wake-up signal, MR will be activated to implement the basic functions of UE, including radio resource management (RRM) measurement, paging, cell reselection and cell switching, as well as various application (app) layer functions.

[0034] Traditional NR reception is based on OFDM receivers. When demodulating, accurate crystal oscillators or OFDM demodulators are required for demodulation. The signal processing process is complex and will generate high power consumption. In order to reduce power consumption, simple modulation signals and simple receivers 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.

[0035] At present, there are four mainstream OOK schemes, namely OOK-Option 1, OOK-Option 2, OOK-Option 3 and OOK-Option 4. Among them, OOK-Option 4 is a pre-distortion method that pre-generates the waveform and then uses operations similar to discrete Fourier transform DFT to approximate the target waveform. It has the dual advantages of rate and performance. Since OOK-Option 4 is an approximation method, it can realize the arbitrary setting of the time domain waveform by setting the corresponding number of signals carried on each OFDM symbol, so as to achieve high rate and high performance of signal transmission.

[0036] However, the main problem with the spectrum generated by OOK-Option 4 is that in order to perfectly represent the "ON" waveform in the time domain, many continuous sampling points are required to produce the same "ON" input. Too many in-phase signals in the time domain will cause spikes in the frequency domain, and the frequency domain energy is too concentrated in the first half of the spectrum. Once encountering the common fast-fading channel scenario of 3GPP, such as TDL-C 300ns, most of the amount will be lost, making the waveform at the receiving end completely distorted. Since the receiving end uses envelope detection, no matter how large the signal-to-noise ratio is, the decider cannot distinguish between high-level waveforms and low-level waveforms, resulting in low detection accuracy and efficiency of LP-WUS signals.

[0037] In response to the technical problems existing in the related art, a signal generation method is proposed in an embodiment of the present application. By performing phase rotation on the OOK waveform to be approximated corresponding to the LP-WUS signal generated based on the OOK-Option 4 scheme, the frequency diversity gain of the LP-WUS signal is improved, so that the signal will not lose most of its energy when passing through the frequency selective fading channel, and still has good performance. It can wake up the MR in the engineering application scenario of 3GPP, thereby achieving the design requirement of power saving.

[0038] Before describing in detail the technical solutions in the embodiments of the present application, the technical terms that may be involved in the embodiments of the present application are first explained and illustrated.

[0039] (1) LP-WUS: Low-Power Wake-Up Signal, used to wake up the main radio module MR in the UE.

[0040] (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.

[0041] (3) OOK-Option 4: A scheme for performing OOK modulation on the LP-WUS signal. It is a pre-distortion method that pre-generates a waveform and then approaches the target waveform through discrete Fourier transform or least squares optimization.

[0042] (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.

[0043] (5)LS optimization: Least Square, least squares optimization method.

[0044] (6) IFFT transform: Inverse Fast Fourier Transform, inverse fast Fourier transform.

[0045] After introducing the technical terms that may be involved in the embodiments of the present application, the signal generation method in the present application is described in detail.

[0046] Figure 1 The system architecture block diagram of a communication system applying the technical solution of the present application is schematically shown.

[0047] like Figure 1As shown, 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 rotation, time-frequency conversion and other processing 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 a target transmission signal transmitted through a multipath attenuation channel, demodulate and envelope detect the received target transmission signal, obtain the LP-WUS signal, and send the LP-WUS signal to a 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.

[0048] 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 modulated, phase rotated, time-frequency converted, and the like are performed on the LP-WUS signal.

[0049] The signal generation method in the present 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 the present application is described in detail below in conjunction with specific implementations.

[0050] Figure 2 A flow chart of a signal generation method is shown, the method is applied to a base station, the base station may be Figure 1 The base station 101 in Figure 2 As shown, the signal generation method includes:

[0051] Step S210: Generate an OOK waveform to be approximated based on the low power wake-up LP-WUS signal, and perform phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and phases changing in a preset rule to obtain a phase rotated OOK waveform.

[0052] The signal generation method of the present application, after generating the LP-WUS signal, modulates the LP-WUS signal to generate the OOK waveform to be approximated, and uses a sequence of phase rotation factors having the same modulus and phases changing in a preset pattern to perform phase rotation on the OOK waveform to be approximated, so as to obtain a phase-rotated OOK waveform. The signal generation method in the present application can disperse the overly concentrated frequency domain energy by performing phase rotation on the OOK waveform to be approximated generated based on the LP-WUS signal, thereby improving the frequency diversity gain of the LP-WUS signal, so that the LP-WUS signal still has good performance when passing through a frequency selective fading channel, avoiding complete distortion of the waveform at the receiving end, thereby ensuring that the receiving end can perform signal detection through envelope detection, and further ensuring that the wake-up signal receiver can wake up the MR in time, meeting the requirements of power-saving design.

[0053] 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, which 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 describing the signal generation method in this application in detail, the orthogonal frequency division multiplexing technology OFDM is briefly described first.

[0054] Figure 3 The schematic diagram of OFDM baseband signal processing is shown as follows: Figure 3 As shown: The signal processing flow is divided into the signal processing flow of the transmitting end (base station) and the signal processing flow of the receiving end (UE): At the transmitting end, the bit stream is first modulated by QAM or QPSK, and then sequentially undergoes serial-to-parallel conversion and IFFT conversion, and then the parallel data is converted into serial data, and a protection interval (also known as "cyclic prefix") is added to form an OFDM code element. When framing, a synchronization sequence and a channel estimation sequence need to be added so that the receiving end can perform burst detection, synchronization and channel estimation, and finally output an orthogonal baseband signal; at the receiving end, when the signal arrives, synchronization and channel estimation are first performed. After completing time synchronization, fractional frequency offset estimation and correction, the FFT transformation is performed, and integer frequency offset estimation and correction are performed. At this time, the data obtained is QAM or QPSK modulated data. Finally, the data is demodulated accordingly to obtain a bit stream.

[0055] In the 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. Specifically, the signal blocks can be divided 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, and then the OOK waveform to be approximated is phase-rotated, and finally the OOK waveform obtained by phase rotation is time-to-frequency transformed to obtain the corresponding frequency domain signal, and the frequency domain signal is mapped to the RE corresponding to each OFDM symbol. This is Figure 3 The modulation mapping process shown in . Considering that at the transmitter, when the OOK-Option 4 scheme is used to perform OOK modulation on the bit stream, many continuous sampling points are required to generate the same "ON" input to generate a perfect "ON" waveform in the time domain. However, too many in-phase signals in the time domain will cause spikes in the frequency domain. When encountering a channel with strong frequency selectivity, once the spike falls into the deep attenuation area, the entire signal loses a lot of energy, and it is difficult to distinguish it by the envelope detection method. Therefore, in the modulation mapping process, the phase of the approximate OOK waveform is rotated so that the final generated frequency domain signal is dispersed instead of concentrated together, thereby ensuring that the signal finally sent to the receiving end has a high frequency diversity gain. When passing through a frequency selective fading channel, it can still have good performance, ensuring the detection of the LP-WUS signal.

[0056] Next, Figure 2 Each step of the signal generation method shown is described in detail.

[0057] In step S210, a binary keying signal OOK waveform to be approximated is generated based on the low power wake-up LP-WUS signal, and a sequence of phase rotation factors having the same modulus and phases changing according to a preset rule is used to phase rotate the OOK waveform to obtain a phase rotated OOK waveform.

[0058] In an exemplary embodiment of the present application, when the LP-WUS signal is serial-to-parallel converted to generate multiple signal blocks, the number of bits contained in the LP-WUS signal is rate matched according to the number of bits that each OFDM symbol can carry. For example, the bit stream corresponding to the LP-WUS signal is b(0), b(1), ..., b(M bit -1), the number of bits contained is Mbit, and the number of bits that each OFDM symbol can carry is Then we can generate signal blocks, i.e. Each of them 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 processing flow of one signal block is described.

[0059] 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, it may be expanded according to the number of sampling points corresponding to the subsequent method of time-frequency conversion of the waveform after phase rotation. In an embodiment of the present application, after the OOK waveform to be approximated is phase-rotated, DFT transform precoding or LS optimization is used to process the phase-rotated OOK waveform, so the signal block may be time-domain expanded according to the number of DFT sampling points and the number of LS optimization sampling points. When DFT sampling points are used for expansion, the sampling points can be set to the LP-WUS signal bandwidth size, so that after completing the DFT change precoding, the frequency domain signal needs to be intercepted according to the LP-WUS signal bandwidth size. When the LP-WUS signal bandwidth size is less than the maximum number of carrying bits corresponding to the OFDM symbol, the part of the OFDM symbol not covered by the extended signal is filled with zeros; when LS optimized sampling points are used for expansion, the sampling points can be set to any value greater than the LP-WUS signal bandwidth size and less than or equal to the maximum number of carrying bits of the OFDM symbol. For example, FFT sampling points can be used for expansion to fill the signal bits in the OFDM symbol, or 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.

[0060] 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, an 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, an example is used to illustrate that when a signal block allocated to an OFDM symbol is 1101, and 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, that is, the extended signal block is composed of 18 1s, 18 1s, 18 0s and 18 1s in sequence.

[0061] 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.

[0062] In an exemplary embodiment of the present application, the frequency diversity gain of the LP-WUS signal can be improved by performing phase rotation on the OOK waveform to be approximated. Specifically, a sequence of phase rotation factors having the same modulus and phases changing in a preset rule can be used to perform phase rotation on the OOK waveform to be approximated, so as to generate a phase-rotated OOK waveform.

[0063] Since one OOK waveform to be approximated corresponds to one OFDM symbol, accordingly, the sequence used to perform phase rotation on the OOK waveform to be approximated also corresponds to the OFDM symbol, and the sequences corresponding to different OFDM symbols may be the same or different. In an embodiment of the present application, the sequence can be constructed according to the phase rotation factor generated by different phase change modes, wherein the different phase change modes are: the phase changes at a preset interval, or the phase is partially repeated and the phase of the non-repeating part changes at a preset interval. Next, the construction method of the sequence for performing phase rotation on the OOK waveform to be approximated is described in detail.

[0064] (1) Phase changes at preset intervals

[0065] Figure 4 The flowchart of determining a sequence for performing phase rotation according to a phase change pattern that changes at a preset interval is schematically shown. Figure 4 As shown, the process at least includes steps S401 to S402, specifically:

[0066] In step S401, a variation sequence is determined according to a preset number of sampling points, the preset interval and a parameter corresponding to the OFDM symbol, and a modulo remainder operation is performed on the variation sequence and a phase rotation parameter to obtain a phase rotation coefficient sequence.

[0067] In an exemplary embodiment of the present application, an initial variation sequence can be first determined according to a preset number of sampling points and a preset interval, wherein the preset number of sampling points is less than or equal to any positive integer, further, the preset number of sampling points can be the number of sampling points of the corresponding ON waveform in the OOK waveform to be approximated or the number of sampling points in the OOK waveform to be approximated; the preset interval can be any positive integer, for example, it can be 1, 2, 3, etc. When the preset interval is 1, it indicates that the phase changes continuously, and when the preset interval is greater than 1, it indicates that the phase changes at intervals; the parameter corresponding to the OFDM symbol is used to adjust the phase rotation factor in the sequence, thereby realizing the phase adjustment of each signal in the extended signal block. In the embodiment of the present application, the parameters corresponding to different OFDM symbols may be the same or different. Specifically, when the indexes of the OFDM symbols are different, the parameters corresponding to each OFDM symbol may be set to 0; when the indexes of the OFDM symbols are different, the parameters corresponding to each OFDM symbol may be set to be the same as the index of the OFDM symbol; for example, when the OFDM symbol is 1, the parameter is 1, when the OFDM symbol is 3, the parameter is 3, and so on; or, when the indexes of the OFDM symbols are different, the parameters corresponding to each OFDM symbol may be set to any different values, for example, when the OFDM symbol is 1, the parameter is 2, when the OFDM symbol is 2, the parameter is 4, and so on. By setting different parameters for different OFDM symbols, different phase conversions can be performed on the signals in the extended signal blocks corresponding to different OFDM symbols, further avoiding the frequency domain peaks caused by the same phase concentration, and thus improving the frequency diversity gain of the LP-WUS signal.

[0068] For the convenience of description, the preset number of sampling points is marked as N, the preset interval is marked as p, and the parameter corresponding to the OFDM symbol is marked as r. Then, according to the preset number of sampling points and the preset interval, an initial variation sequence m can be obtained. i ={0,p,...,p(N-1)}, where i is the index corresponding to the variation, N and p are positive integers. Further, the variation sequence can be obtained according to the initial variation sequence and the parameters corresponding to the OFDM symbol as (m i +r).

[0069] After obtaining the variation sequence, a modulo remainder operation can be performed on the variation sequence and the phase rotation parameter to obtain a phase rotation coefficient sequence. Similarly, the phase rotation parameter can be marked as μ, and the phase rotation coefficient sequence can be obtained as follows: The phase rotation parameter μ may be any positive number. Furthermore, the phase rotation parameter may also be a value determined according to a method for determining a preset number of sampling points. Specifically, when the preset number of sampling points is the number of sampling points corresponding to the ON waveform in the OOK waveform to be approximated, When the preset number of sampling points is the number of sampling points in the OOK waveform to be approximated, in, is the number of bits contained in the extended signal block corresponding to the OFDM symbol, It is the number of bits carried by one OFDM symbol during rate matching.

[0070] In step S402, is a phase rotation base, generates a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructs the sequence according to the phase rotation factors.

[0071] In an exemplary embodiment of the present application, after determining the phase rotation coefficient sequence, multiple phase rotation factors can be generated according to the phase rotation base and the phase rotation coefficient sequence, and then a sequence for performing phase rotation on the approximated OOK waveform can be constructed according to the multiple phase rotation factors, wherein the phase rotation base is The constructed sequence is as shown in expression (1):

[0072]

[0073] Among them, α l (m i ) is the sequence; l is the index of the OFDM symbol; mi+r is the variation sequence; i is the variation index, which is a non-negative integer; N is the preset number of sampling points, which is an arbitrary positive integer; r is the parameter corresponding to the OFDM symbol, which is a non-negative integer; μ is the phase rotation parameter, which is an arbitrary positive number; p is the preset interval; m i modμ is the phase rotation coefficient sequence.

[0074] (2) The phase part repeats and the phase of the non-repeating part changes at a preset interval

[0075] Figure 5 The flowchart of determining a sequence for performing phase rotation according to a phase change pattern that changes at a preset interval is schematically shown. Figure 5 As shown, in step S501, a variation sequence is determined according to a preset number of sampling points, the preset interval and a parameter corresponding to the OFDM symbol, and a modulo remainder operation is performed on the variation sequence and the phase rotation parameter to obtain a phase rotation coefficient sequence; in step S502, is a phase rotation base, generates multiple phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructs an initial sequence according to the phase rotation factors; in step S503, the phase rotation factors to be repeated in the initial sequence are repeated according to a preset repetition amount to obtain the sequence.

[0076] contrast Figure 4 and Figure 5It can be seen that the initial sequence is a sequence obtained when the phase changes at a preset interval. As shown in expression (1), the final sequence used to perform phase rotation on the approximated OOK waveform can be obtained by repeating part of the phase rotation factors to be repeated in the initial sequence. In an embodiment of the present application, the number of phase rotation factors to be repeated is less than the number of phase rotation factors included in the initial sequence. At the same time, the preset repetition amount does not exceed half of the total signal amount in the extended signal block corresponding to the OFDM symbol. The specific value can be set according to actual needs, and the embodiment of the present application does not make specific limitations on this.

[0077] According to expression (1), the sequence constructed with multiple phase rotation factors can also be expressed as expression (2):

[0078]

[0079] Exemplarily, when the phase rotation factors to be repeated are the phase rotation factors of the 0th and 1st positions, the sequence can be converted into expression (3):

[0080]

[0081] Wherein, M is a preset repetition amount and is a positive integer greater than 1.

[0082] In an exemplary embodiment of the present application, after determining a sequence containing multiple phase rotation factors according to different phase change patterns, the OOK waveform to be approximated corresponding to the OFDM symbol can be phase rotated according to the sequence. Specifically, the phase rotation factors at different positions are applied to the signal in the extended signal block corresponding to the OFDM symbol to transform the signal.

[0083] From the perspective of waveform transformation, the phase rotation of the OOK waveform to be approximated can be performed by determining the waveform to be rotated corresponding to the preset number of sampling points in the OOK waveform to be approximated according to the method of determining the preset number of sampling points. For example, if the preset number of sampling points is determined according to the number of sampling points corresponding to the ON waveform, then the ON waveform can be used as the waveform to be rotated. For example, if the preset number of sampling points is determined according to the number of sampling points corresponding to the OOK waveform to be approximated, then the OOK waveform to be approximated can be used as the waveform to be rotated, and so on. Then, the waveform to be rotated is phase-rotated according to the phase rotation factor in the sequence to obtain a phase-rotated OOK waveform. Specifically, in mathematical operations, the signal matrix corresponding to the OOK waveform to be approximated is rotated using the phase rotation matrix corresponding to the sequence. If the phase rotation matrix is ​​marked as α μ , the signal matrix corresponding to the OOK waveform to be approximated is marked as b n , then the phase-rotated OOK waveform is α μ b n .

[0084] Since the phase rotation of the OOK waveform to be approximated is essentially the phase transformation of the signals constituting the OOK waveform to be approximated, from the perspective of signal transformation, when the OOK waveform to be approximated is phase rotated, the target phase rotation factor corresponding to the signal in the extended signal block corresponding to the OOK waveform to be approximated can be determined from a sequence containing multiple phase rotation factors, and then the signal is phase rotated according to the target phase rotation factor to obtain a phase rotated signal. After the traversal is completed, the phase rotated OOK waveform can be constructed according to all phase rotated signals. Specifically for mathematical operations, the extended signal block corresponding to the OFDM symbol indexed as l can be marked as For the signal in the extended signal block, the target phase rotation factor corresponding to it is determined from the sequence, and the target phase rotation factor is used to perform phase rotation on the corresponding signal, that is, according to Perform phase rotation, where i is the index of the signal in the extended signal block, j is the index of the phase rotation factor in the sequence, which is a non-negative integer. i and j can be the same or different. Then, the phase rotation signal block corresponding to the OFDM symbol can be obtained as follows: For the inclusion of M bit For the LP-WUS signal, the final phase rotation signal is

[0085] It is worth noting that when determining the target phase rotation factor corresponding to the signal, it can be determined according to the position index of the signal in the OFDM symbol, or a phase rotation factor whose position index in the sequence is different from the position index of the signal on the OFDM symbol can be used as the target phase rotation factor. For example, when the signal is the 0th bit signal on the OFDM symbol, the 0th bit phase rotation factor in the sequence can be used as the target phase rotation factor, or a non-0th bit phase rotation factor can be used as the target phase rotation factor, such as the 2nd bit, 4th bit, etc. The phase rotation factor is used as the target phase rotation factor.

[0086] Figure 6 The signal interface diagram after the phase rotation of the high potential waveform in the OOK waveform to be approximated is schematically shown based on the sequence determined by the preset interval 1, as shown in FIG. Figure 6 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}. Since the high potential waveform occupies 4 bits, the preset number of sampling points N=4 can be determined. When the phase rotation parameter When the parameter r corresponding to the OFDM symbol is 0, the sequence used for phase rotation can be obtained as According to this sequence, the high potential signal in the extended signal block can be phase rotated, and the final rotated signal block is:

[0087] Figure 7 The signal interface diagram after the phase rotation of the sequence to be approximated OOK waveform based on the preset interval 1 is schematically shown, as shown in FIG. Figure 7 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}. Since the extended signal block contains 16 bits, the preset number of sampling points N=16 can be determined. When the phase rotation parameter , when the parameter r corresponding to the OFDM symbol is 1, the sequence used for phase rotation can be obtained as According to this sequence, the extended signal block can be phase rotated. Since the signal is 0, it is still 0 after rotation, so the rotated signal block can be obtained as

[0088] Figure 8 The signal interface diagram after phase rotation of the high potential waveform approaching the OOK waveform based on the sequence determined by the preset interval 5 is schematically shown, as shown in FIG. Figure 8 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, then the preset number of sampling points N=4 can be determined. When the phase rotation parameter When the parameter r corresponding to the OFDM symbol is 3, the sequence used for phase rotation can be obtained as According to the sequence, the extended signal block can be phase rotated, and the rotated signal block can be obtained as follows:

[0089] Fig. 9 The signal interface diagram after the phase rotation of the high potential waveform in the OOK waveform to be approximated is schematically shown based on the sequence determined by the preset interval amount 1 and the preset repetition amount 2, as shown in FIG. Fig. 9 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, then the preset number of sampling points N=4 can be determined. When the phase rotation parameter When the parameter r corresponding to the OFDM symbol is 0 and the phase rotation factors to be repeated are the phase rotation factors of the 0th and 1st positions, the sequence used for phase rotation can be obtained as According to the sequence, the high potential signal in the extended signal block can be phase rotated, and the rotation signal block can be obtained as follows:

[0090] It is worth noting that although the number of phase rotation factors in the sequence is greater than the number of sampling points corresponding to the high-potential waveform, when the signal corresponding to the high-potential waveform is phase rotated, it is only rotated according to the target phase rotation factor corresponding to the high-potential waveform signal in the sequence.

[0091] In an exemplary embodiment of the present application, Figure 6-Figure 9 The phase rotation shown in the figure all uses the phase rotation factor and signal corresponding to the same position index for phase rotation. However, in the embodiment of the present application, it is not limited to this. Phase rotation can also be performed according to phase rotation factors and signals with different position indexes. For example, the phase rotation factors in the sequence are cyclically shifted. When the number of phase rotation factors is greater than the number of signals in the waveform to be rotated, some of the phase rotation factors in the sequence can be used as target phase rotation factors corresponding to the signals in the waveform to be rotated. Fig. 9 For example, the first phase rotation factor in the sequence can be used as the target phase rotation factor corresponding to the 0th signal in the high-level signal, the second phase rotation factor can be used as the target phase rotation factor corresponding to the 1st signal in the high-level signal, the third phase rotation factor can be used as the target phase rotation factor corresponding to the 2nd signal in the high-level signal, and the fourth phase rotation factor can be used as the target phase rotation factor corresponding to the 3rd signal in the high-level signal. Finally, the rotation signal block is obtained as follows: When the number of phase rotation factors is the same as the number of signals, the 2nd phase rotation factor is used to phase rotate the 0th signal, then correspondingly, the 0th phase rotation factor is used to phase rotate the 2nd to last signal, and the 1st phase rotation factor is used to phase rotate the 1st to last (last) signal, and so on.

[0092] In an exemplary embodiment of the present application, after obtaining the phase-rotated OOK waveform, the phase-rotated OOK waveform can also be subjected to DFT transform precoding or least squares LS optimization to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform. Furthermore, a target transmission signal sent to the UE can be generated based on the frequency domain signal.

[0093] In an exemplary embodiment of the present application, similar to the phase rotation of the approximated 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 art, this 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.

[0094] (1) Matrix-level LS optimization scheme

[0095] 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.

[0096] The OOK waveform generation based on LS optimization is divided into a non-shift-based basic generation method and a shift-based extended generation method. Among them, the LS-optimized approximate expression corresponding to the non-shift-based basic generation method is shown in formula (4):

[0097]

[0098] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse Fourier transform matrix,

[0099] G is the interception matrix,

[0100] b n For the extended signal block.

[0101] Expanding the approximation after LS optimization, we get the expression shown in (5):

[0102]

[0103] Expression (5) is a very typical FFT transformation. Each element in the matrix is ​​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 n-point FFT transform is shortened to L length through the LS optimization.

[0104] Based on the shiftable extended generation method, the LS optimization mapping of different frequency domain positions is realized by using the phase transformation factor. The approximate expression of the LS optimization corresponding to the shiftable extended generation method is shown in formula (6):

[0105]

[0106] 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; w is the phase adjustment matrix of the current bit based on the mapping position, kc is the starting position of frequency domain mapping.

[0107] 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 (5) can be obtained according to formula (6), as shown in expression (7):

[0108]

[0109] According to formula (6), 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 (8):

[0110]

[0111] For the shiftable extension generation method described above, although a good approximation effect can be obtained, 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, before using formula (6) to obtain the frequency domain signal, a set of sequences can be entered for phase rotation. The signal in the approximated OOK waveform is phase rotated through this sequence, and then the corresponding frequency domain signal is obtained based on formula (6). The expression of the frequency domain signal obtained by LS optimization is shown in formula (9):

[0112]

[0113] Among them, α μ is a sequence for phase rotation, which is the same as the sequence α described above. l (m i ) is equivalent, that is, α μ is a sequence consisting of different phase rotation factors corresponding to the same OFDM symbol; b n is an extended signal sequence, which is the same as the extended signal block b described above. l (i) Equivalent, i.e. b n is a sequence consisting of spread signals corresponding to the same OFDM symbol.

[0114] By expanding formula (9), we can get the frequency domain signal after LS optimization as shown in formula (10):

[0115]

[0116] The rightmost sequence is the final generated frequency domain signal, where each signal is mapped to a different RE on the same OFDM symbol. By analyzing the expression of the signal, we can see that each signal has different phase information. For example, the phase information corresponding to the 0th signal is 1, and the phase information corresponding to the 1st signal is The phase information corresponding to the second signal is The phase information corresponding to the R-1th signal is: Since the signals on different REs have different phase information, the spectrum signal is relatively dispersed and the spectrum energy is reduced, forming an effect similar to spread spectrum, improving the frequency diversity gain of the signal, and thus ensuring that the signal still has good performance when passing through the frequency selective fading channel.

[0117] (2) Signal-level DFT transform precoding scheme

[0118] The matrix-level LS optimization scheme is a scheme for processing the extended signal blocks corresponding to OFDM symbols. Considering that the essence of processing the extended signal blocks corresponding to OFDM symbols is to process each signal in the extended signal blocks, in order to clearly understand the technical scheme of the present application, the method of performing signal-level processing on the phase-rotated OOK waveform in an embodiment of the present application to obtain the corresponding frequency domain signal is explained below.

[0119] 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 phase-rotated OOK waveform. 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. Specifically, DFT transform precoding can be performed according to formula (11):

[0120]

[0121] Where y(·) is the frequency domain signal generated by DFT transform precoding; l is the index of OFDM symbol, which ranges from Increasing in sequence; k is the RE position index on the lth OFDM symbol, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; is the phase rotation signal block corresponding to the lth OFDM symbol; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0122] In an exemplary embodiment of the present application, according to formula (11), only a unique 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, when l=1 and k=0, the expression of the frequency domain signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated according to formula (11):

[0123] It is worth noting that the coefficients in formula (11) 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.

[0124] (3) Signal-level LS optimization solution

[0125] 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 the number of time domain points, or can be greater than the number of time domain points. In an embodiment of the present application, LS optimization can be performed according to formula (12), as follows:

[0126]

[0127] Where y(·) is the frequency domain signal generated by LS optimization; l is the index of 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; 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 a phase rotation signal block corresponding to the OFDM symbol with index l; bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0128] In the exemplary embodiment of the present application, due to the number of sampling points of LS optimization Larger than the frequency domain bandwidth of the LP-WUS signal However, the final mapping only requires the same number of frequency domain signals as the frequency domain bandwidth. Therefore, during LS optimization, the frequency domain signals need to be intercepted, as shown in formula (12): As shown, only points, rather than points, and correspondingly, the phase ends at The rest are discarded. In other words, LS optimization is essentially a truncation of DFT.

[0129] In an exemplary embodiment of the present application, similar to the DFT transform precoding scheme, according to formula (12), 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 (10). For example, when l=1 and k=0, the expression of the frequency domain signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated according to formula (12):

[0130] It is worth noting that the power control factor β in formula (12) is used to ensure that the average value of the signal-noise ratio (Signal-Noise Ratio, SNR or S / N) is the same as the signal-noise ratio in the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), and further, it can also be used to ensure that the average value of the signal-to-interference ratio (Signal to Interference Ratio, SIR) is the same as the signal-to-interference ratio in PDSCH, and the average value of the signal-to-interference and noise ratio (Signal to Interference and noise Ratio, SINR) is the same as the signal-to-interference and noise ratio in PDSCH.

[0131] In the above embodiments, the matrix-level LS optimization scheme, the signal-level DFT transform precoding scheme, and the signal-level LS optimization scheme are described. The purpose of these optimization schemes is the same, which is to convert the time domain signal corresponding to the phase-rotated OOK waveform into a frequency domain signal. Since the number of time domain points can be greater than the number of frequency domain bandwidth points in the LS optimization scheme, and the more time domain points, the better the approximation effect, the LS optimization scheme can better approximate the original OOK waveform to be approximated than the DFT transform precoding scheme for signal processing, and the performance is better.

[0132] In an exemplary embodiment of the present application, after acquiring a frequency domain signal corresponding to a phase-rotated OOK waveform, a target transmission signal can be generated based on the frequency domain signal, and the target transmission signal is a signal including an LP-WUS signal sent to the UE.

[0133] Among them, when generating the target transmission signal based on the 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, mapped to the RE in the OFDM modulator, and 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. Further, the target transmission signal can be constructed according to the target OOK waveform. Figure 3 Taking the OFDM baseband signal processing principle diagram shown 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 method (IFFT) 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 subjected to parallel-to-serial conversion, 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 zeros in the protection interval or adding a cyclic prefix to avoid inter-symbol interference, and the target transmitted signal can be obtained.

[0134] In an exemplary embodiment of the present application, after acquiring the target transmission signal, the target transmission signal can be sent to the UE end through a multipath fading channel. After the wake-up signal receiver in the UE end receives the target transmission signal, the target transmission signal can be envelope detected to obtain the LP-WUS signal. The processing flow of the wake-up signal receiver for the target transmission signal is the same as that of the Figure 3 The receiving end processing flow is the same as that shown in , and the embodiments of the present application will not be repeated here.

[0135] According to the signal generation method in the embodiment of the present application, phase rotation is performed before DFT transform precoding or LS optimization is performed on the approximate OOK waveform, thereby avoiding frequency domain energy concentration and 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, most of the energy will not be lost even when passing through a deep fade area. The signal has a strong anti-fading capability, and the integrity of the LP-WUS signal received by the UE is ensured. When the envelope detection method is used for signal detection, the high-level waveform and the low-level waveform can be clearly distinguished, and the LP-WUS signal can be extracted, thereby improving the detection rate and detection accuracy of the LP-WUS signal.

[0136] Furthermore, the wake-up signal receiver can wake up the main wireless module MR in the UE according to the demodulated LP-WUS signal, ensure the signal synchronization between MR and the base station, realize the basic functions of the UE, and achieve the purpose of saving energy consumption.

[0137] The present application also provides a signal generating device, Fig.10 1 shows a schematic diagram of the structure of a signal generating device, the signal generating device 1000 is configured in a base station, such as Fig.10 As shown, the signal generating device 1000 may include a phase rotation module 1001, specifically:

[0138] The phase rotation module 1001 is used to generate an OOK waveform of a binary keying signal to be approximated based on a low-power wake-up LP-WUS signal, and phase-rotate the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule to obtain a phase-rotated OOK waveform.

[0139] In an exemplary embodiment of the present application, the phase rotation module 1001 is 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; 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.

[0140] In an exemplary embodiment of the present application, the signal generating device 1000 includes: a sequence construction module, which is used to construct the sequence according to phase rotation factors generated with different phase change modes before using a sequence containing multiple phase rotation factors with the same modulus and phases changing according to a preset rule to perform phase rotation on the OOK waveform to be approximated, wherein the different phase change modes are: the phase changes with a preset interval, or the phase is repeated in part and the phase of the non-repeating part changes with a preset interval.

[0141] In an exemplary embodiment of the present application, when the different phase change modes are phase changes at a preset interval, the sequence construction module includes: a first processing unit, which is used to determine a change amount sequence according to a preset number of sampling points, the preset interval and a parameter corresponding to an OFDM symbol, and to perform a modulo remainder operation on the change amount sequence and the phase rotation parameter to obtain a phase rotation coefficient sequence; a second processing unit, which is used to is a phase rotation base, generates a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructs the sequence according to the phase rotation factors.

[0142] In an exemplary embodiment of the present application, when the different phase change patterns are phase partial repetitions and the phase of the non-repeating part changes at a preset interval, the sequence construction module includes: a third processing unit, which is used to determine a variation sequence according to a preset number of sampling points, the preset interval and a parameter corresponding to an OFDM symbol, and to perform a modulo remainder operation on the variation sequence and the phase rotation parameter to obtain a phase rotation coefficient sequence; a fourth processing unit, which is used to A phase rotation base is used to generate multiple phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and an initial sequence is constructed according to the phase rotation factors; a fifth processing unit is used to repeat the phase rotation factors to be repeated in the initial sequence according to a preset repetition amount to obtain the sequence.

[0143] In an exemplary embodiment of the present application, the second processing unit is configured as follows: the sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relationship (1):

[0144]

[0145] Among them, α l (m i ) is the sequence; l is the index of the OFDM symbol; mi+r is the variation sequence; i is the variation index, which is a non-negative integer; N is the preset number of sampling points, which is an arbitrary positive integer; r is the parameter corresponding to the OFDM symbol, which is a non-negative integer; μ is the phase rotation parameter, which is an arbitrary positive number; p is the preset interval; m i modμ is the phase rotation coefficient sequence.

[0146] In an exemplary embodiment of the present application, the fourth processing unit is configured as follows: the initial sequence, the phase rotation base, and the phase rotation coefficient sequence satisfy the relationship (2):

[0147]

[0148] Among them, α l (m i ) is the initial sequence; l is the index of the OFDM symbol; mi+r is the variation sequence; i is the variation index, which is a non-negative integer; N is the preset number of sampling points, which is an arbitrary positive integer; r is the parameter corresponding to the OFDM symbol, which is a non-negative integer; μ is the phase rotation parameter, which is an arbitrary positive number; p is the preset interval; m i modμ is the phase rotation coefficient sequence.

[0149] In an exemplary embodiment of the present application, the sequence construction module is configured as follows: when the indexes of the OFDM symbols are different, the r corresponding to each of the OFDM symbols is 0; when the indexes of the OFDM symbols are different, the r corresponding to each of the OFDM symbols is the index of the OFDM symbol; or, when the indexes of the OFDM symbols are different, the r corresponding to each of the OFDM symbols is an arbitrary value that is different from each other.

[0150] In an exemplary embodiment of the present application, the preset number of sampling points is the number of sampling points of the ON waveform corresponding to the OOK waveform to be approximated or the number of sampling points in the OOK waveform to be approximated; the sequence construction module is configured as follows: when the preset number of sampling points is the number of sampling points corresponding to the ON waveform, When the preset number of sampling points is the number of sampling points in the OOK waveform to be approximated, in, is the number of bits contained in the extended signal block corresponding to the OFDM symbol, It is the number of bits carried by one OFDM symbol during rate matching.

[0151] In an exemplary embodiment of the present application, the signal generating device 1000 includes: an adjustment module, which is used to perform time domain expansion on the signal block according to DFT transform precoding or least squares LS optimization of the corresponding number of sampling points before using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule to perform phase rotation on the OOK waveform to be approximated, and perform OOK modulation on the extended signal block obtained by the time domain expansion to obtain the OOK waveform to be approximated.

[0152] In an exemplary embodiment of the present application, the adjustment module is configured as follows: when DFT variation precoding is performed on the phase-rotated OOK waveform, 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 LS optimization is performed on the phase-rotated OOK waveform, 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.

[0153] In an exemplary embodiment of the present application, the phase rotation module 1001 is configured to: determine the waveform to be rotated corresponding to the preset number of sampling points in the OOK waveform to be approximated according to the method for determining the preset number of sampling points; and perform phase rotation on the waveform to be rotated according to the sequence to obtain the phase-rotated OOK waveform.

[0154] In an exemplary embodiment of the present application, the phase rotation module 1001 is configured to: determine a target phase rotation factor corresponding to the signal in the extended signal block from the sequence; perform phase rotation on the signal according to the target phase rotation factor to obtain a phase rotated signal; and construct the phase rotated OOK waveform based on all the phase rotation signals.

[0155] In an exemplary embodiment of the present application, the signal generating device 1000 also includes: an optimization module, used to perform DFT transform precoding or least squares LS optimization on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform, and generate a target transmission signal based on the frequency domain signal.

[0156] In an exemplary embodiment of the present application, the optimization module 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 (3):

[0157]

[0158] 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; The number of sampling points corresponding to the DFT transform precoding; is the phase rotation signal block corresponding to the lth OFDM symbol; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0159] In an exemplary embodiment of the present application, the optimization module is configured as follows: the index of the frequency domain signal 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 (4):

[0160]

[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; Optimize the number of sampling points corresponding to the LS; is the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor; is the phase rotation signal block corresponding to the lth OFDM symbol; 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, the optimization module is configured to perform LS optimization on the phase-rotated OOK waveform according to the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor, wherein the frequency domain signal and the phase-rotated OOK waveform, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor satisfy the relationship (5):

[0163]

[0164] Among them, X LS is a frequency domain signal sequence, the X LS Each element in is a frequency domain signal mapped to different resource elements RE; The truncation matrix constructed according to the bandwidth of the LP-WUS signal; is the inverse Fourier transform matrix, N is the number of sampling points; F inv The conjugate transposed matrix of ; is the phase change factor, k c is the starting position of the frequency domain mapping, which can be on any RE of any resource block RB; α μ b n is the phase-rotated OOK waveform; μ is the sequence; b n is the OOK waveform to be approximated.

[0165] In an exemplary embodiment of the present application, the optimization module is configured to: map the frequency domain signal corresponding to the RE on each of the OFDM symbols 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 the target transmission signal based on the target OOK waveform.

[0166] In an exemplary embodiment of the present application, the signal generating device 1000 is also configured to: send the target transmit signal to a wake-up signal receiver in a 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.

[0167] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0168] In addition, although the steps of the method in the present application are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the 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, etc.

[0169] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods 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 implementation methods of the present application.

[0170] Fig.11 A computer system structure block diagram of an electronic device for implementing an embodiment of the present application is schematically shown, and the electronic device may be arranged in a base station.

[0171] It should be noted that Fig.11 The computer system 1100 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0172] like Fig.11As shown, the computer system 1100 includes a central processing unit 1101 (CPU), which can perform various appropriate actions and processes according to the program stored in the read-only memory 1102 (ROM) or the program loaded from the storage part 1108 to the random access memory 1103 (RAM). Various programs and data required for system operation are also stored in the random access memory 1103. The central processing unit 1101, the read-only memory 1102 and the random access memory 1103 are connected to each other through a bus 1104. An input / output interface 1105 (Input / Output interface, i.e., I / O interface) is also connected to the bus 1104.

[0173] In some embodiments, the following components are connected to the input / output interface 1105: an input section 1106 including a keyboard, a mouse, etc.; an output section 1107 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage section 1108 including a hard disk, etc.; and a communication section 1109 including a network interface card such as a local area network card, a modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive 1110 is also connected to the input / output interface 1105 as needed. A removable medium 1111, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1110 as needed, so that a computer program read therefrom is installed into the storage section 1108 as needed.

[0174] In particular, according to an embodiment of the present application, the process described in each method flow chart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer readable medium, and the computer program contains a program code for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 1109, and / or installed from the removable medium 1111. When the computer program is executed by the central processor 1101, various functions defined in the system of the present application are executed.

[0175] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable medium or any combination of the above two. Computer-readable media can be, for example, - but not limited to - electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples of computer-readable media can include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (Erasable Programmable Read Only Memory, EPROM), flash memory, optical fibers, portable compact disk read-only memories (Compact Disc Read-Only Memory, CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In the present application, a computer-readable medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, wherein a computer-readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0176] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of a 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 a different order from the order 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 flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0177] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0178] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by combining software with necessary hardware. Therefore, the technical solution according to the implementation 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 a number of instructions to enable an electronic device to execute the method according to the implementation of the present application.

[0179] It should be understood that the present application is not limited to the precise structures that have been 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, characterized in that: include: A binary keying signal OOK waveform to be approximated is generated based on a low power wake-up LP-WUS signal, and a sequence of phase rotation factors having the same modulus and phases changing in a preset rule is used to phase rotate the OOK waveform to obtain a phase rotated OOK waveform.

2. The method according to claim 1, characterized in that: The method of generating an OOK waveform to be approximated based on a low power wake-up 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.

3. The method according to claim 1 or 2, characterized in that: Before performing phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule, the method further includes: The sequence is constructed according to phase rotation factors generated in different phase change patterns, wherein the different phase change patterns are: the phase changes at a preset interval, or the phase is partially repeated and the phase of the non-repeated part changes at a preset interval.

4. The method according to claim 3, characterized in that When the different phase change modes are phase changes at a preset interval, constructing the sequence according to the phase rotation factors generated in the different phase change modes includes: Determine a variation sequence according to a preset number of sampling points, the preset interval and a parameter corresponding to an OFDM symbol, and perform a modulo remainder operation on the variation sequence and a phase rotation parameter to obtain a phase rotation coefficient sequence; by is a phase rotation base, generates a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructs the sequence according to the phase rotation factors.

5. The method according to claim 3, characterized in that: When the different phase change patterns are phase partial repetitions and the phase of the non-repeating part changes at a preset interval, constructing the sequence according to the phase rotation factors generated by the different phase change patterns includes: Determine a variation sequence according to a preset number of sampling points, the preset interval and a parameter corresponding to an OFDM symbol, and perform a modulo remainder operation on the variation sequence and a phase rotation parameter to obtain a phase rotation coefficient sequence; by is a phase rotation base, generates a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructs an initial sequence according to the phase rotation factors; The phase rotation factor to be repeated in the initial sequence is repeated according to a preset repetition amount to obtain the sequence.

6. The method according to claim 4, characterized in that The step of generating a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructing the sequence according to the phase rotation factors comprises: The sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relationship (1): Among them, α l (m i ) is the sequence; l is the index of the OFDM symbol; mi+r is the variation sequence; i is the variation index, which is a non-negative integer; N is the preset number of sampling points, which is an arbitrary positive integer; r is the parameter corresponding to the OFDM symbol, which is a non-negative integer; μ is the phase rotation parameter, which is an arbitrary positive number; p is the preset interval; m i modμ is the phase rotation coefficient sequence.

7. The method according to claim 5, characterized in that The step of generating a plurality of phase rotation factors according to the phase rotation base and the phase rotation coefficient sequence, and constructing an initial sequence according to the phase rotation factors comprises: The initial sequence, the phase rotation base, and the phase rotation coefficient sequence satisfy the relationship (2): Among them, α l (m i ) is the initial sequence; l is the index of the OFDM symbol; mi+r is the variation sequence; i is the variation index, which is a non-negative integer; N is the preset number of sampling points, which is an arbitrary positive integer; r is the parameter corresponding to the OFDM symbol, which is a non-negative integer; μ is the phase rotation parameter, which is an arbitrary positive number; p is the preset interval; m i modμ is the phase rotation coefficient sequence.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: When the indexes of the OFDM symbols are different, r corresponding to each of the OFDM symbols is 0; When the indexes of the OFDM symbols are different, r corresponding to each OFDM symbol is the index of the OFDM symbol; or When the indexes of the OFDM symbols are different, r corresponding to each OFDM symbol is an arbitrary value that is different from each other.

9. The method according to claim 6 or 7, characterized in that: The preset number of sampling points is the number of sampling points corresponding to the ON waveform in the OOK waveform to be approximated or the number of sampling points in the OOK waveform to be approximated; the method further includes: When the preset number of sampling points is the number of sampling points corresponding to the ON waveform, When the preset number of sampling points is the number of sampling points in the OOK waveform to be approximated, in, is the number of bits contained in the extended signal block corresponding to the OFDM symbol, It is the number of bits carried by one OFDM symbol during rate matching.

10. The method according to claim 2, characterized in that Before performing phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule, the method further includes: The signal block is time-domain extended according to the number of sampling points corresponding to DFT transform precoding or least squares LS optimization, and the extended signal block obtained by time-domain extension is OOK modulated to obtain the OOK waveform to be approximated.

11. The method according to claim 10, characterized in that The time domain expansion of the signal block according to the number of sampling points corresponding to the DFT transform precoding or the least squares method LS optimization includes: When the phase-rotated OOK waveform is subjected to DFT variation precoding, a signal block corresponding to each of the OFDM symbols is time-domain expanded according to the number of sampling points corresponding to the bandwidth size of the LP-WUS signal, and a portion of the OFDM symbol not covered by the extended signal is filled with zeros; When the phase-rotated OOK waveform is LS optimized, 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.

12. The method according to claim 9, characterized in that The method of using a sequence of phase rotation factors having the same modulus and phases changing in a preset regularity to perform phase rotation on the OOK waveform to be approximated to obtain a phase-rotated OOK waveform includes: According to the method for determining the preset number of sampling points, determining a waveform to be rotated corresponding to the preset number of sampling points in the OOK waveform to be approximated; The waveform to be rotated is phase-rotated according to the sequence to obtain the phase-rotated OOK waveform.

13. The method according to claim 9, characterized in that The method of using a sequence of phase rotation factors having the same modulus and phases changing in a preset regularity to perform phase rotation on the OOK waveform to be approximated to obtain a phase-rotated OOK waveform includes: determining, from the sequence, a target phase rotation factor corresponding to a signal in the extended signal block; Performing phase rotation on the signal according to the target phase rotation factor to obtain a phase rotated signal; The phase-rotated OOK waveform is constructed based on all the phase-rotated signals.

14. The method according to claim 2, characterized in that The method further comprises: The phase-rotated OOK waveform is subjected to DFT transform precoding or least squares LS optimization to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform, and a target transmission signal is generated based on the frequency domain signal.

15. The method according to claim 14, characterized in that The performing DFT transform precoding on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform 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 (3): 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; The number of sampling points corresponding to the DFT transform precoding; is the phase rotation signal block corresponding to the lth OFDM symbol; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

16. The method according to claim 14, characterized in that The performing LS optimization on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform includes: The index of the frequency domain signal 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 (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 Increasing in sequence; Optimize the number of sampling points corresponding to the LS; is the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor; is the phase rotation signal block corresponding to the lth OFDM symbol; M bit is the number of bits contained in the bit stream corresponding to the LP-WUS signal.

17. The method according to claim 14, characterized in that The performing LS optimization on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform includes: The phase-rotated OOK waveform is LS optimized according to the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor, wherein the frequency domain signal and the phase-rotated OOK waveform, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor satisfy the relationship (5): Among them, X LS is a frequency domain signal sequence, the X LS Each element in is a frequency domain signal mapped to different resource elements RE; The truncation matrix constructed according to the bandwidth of the LP-WUS signal; is the inverse Fourier transform matrix, N is the number of sampling points; F inv The conjugate transposed matrix of ; is the phase change factor, k c is the starting position of the frequency domain mapping, which can be on any RE of any resource block RB; α μ b n is the phase-rotated OOK waveform; μ is the sequence; b n is the OOK waveform to be approximated.

18. The method according to any one of claims 15 to 17, characterized in that: The generating a target transmission signal based on the frequency domain signal comprises: Mapping the frequency domain signal corresponding to the RE on each of the OFDM symbols 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 the target transmission signal is constructed according to the target OOK waveform.

19. The method according to claim 14, characterized in that 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 target transmission signal is envelope-detected by the wake-up signal receiver to obtain the LP-WUS signal, and the main wireless module is awakened based on the LP-WUS signal.

20. A signal generating device, characterized in that: include: A phase rotation module is used to generate an OOK waveform of a binary keying signal to be approximated based on a low-power wake-up LP-WUS signal, and phase-rotate the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule to obtain a phase-rotated OOK waveform.

21. The signal generating device according to claim 20, characterized in that: The signal generating device further comprises: An optimization module is used to perform DFT transform precoding or least squares LS optimization on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform, and generate a target transmission signal based on the frequency domain signal.

22. A communication system, characterized in that: include: A base station, configured to generate a low-frequency wake-up LP-WUS signal, and to generate an OOK waveform of a binary keying signal to be approximated based on the LP-WUS signal; Performing phase rotation on the OOK waveform to be approximated using a sequence of phase rotation factors having the same modulus and whose phases change according to a preset rule, so as to obtain a phase-rotated OOK waveform; Performing DFT transform precoding or least squares LS optimization on the phase-rotated OOK waveform to obtain a frequency domain signal corresponding to the phase-rotated OOK waveform, and generating a target transmission 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 LP-WUS signal, and wake up the main wireless module according to the LP-WUS signal; the main wireless module is used to communicate wirelessly with the base station.

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