Signal generation method and apparatus, and communication system

Abstract

The present disclosure relates to the technical field of wireless communications and terminals, and provides a signal generation method and apparatus, and a communication system. The method comprises: replacing some waveforms of each cycle among OOK waveforms to be approximated with constant modulus sequences, the constant modulus sequences being a group of sequences having the same modulus value but different phases. According to embodiments of the present disclosure, OOK waveforms to be approximated can be dispersed to improve frequency diversity gains of signals and form an effect similar to spread spectrum, so that the signals can still have good performance when passing through frequency-selective fading channels (for example, TDL-C), thereby improving the detection accuracy and the detection efficiency of the signals, improving the NR reception synchronization and reducing energy loss.

Description

Signal generation method, device and communication system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202310914691.5, filed on July 24, 2023, entitled “Signal Generation Method, Device and Communication System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of wireless communications and terminal technologies, and in particular to a signal generation method, device, and communication system. Background Art

[0004] In the field of wireless communications, in the new radio (NR) system, when there is no data service, the terminal can enter a dormant state, such as an idle state (Idle) or an inactive state (Inactive), to reduce the power consumption level of the terminal and achieve the purpose of saving energy. When there is data service, the base station can wake up the terminal through a low-power wake-up signal (Low-Power Wake-Up Signal, LP-WUS), instructing the terminal to resume from the dormant state to the working state, such as the connected state, thereby completing the sending and receiving of data services.

[0005] Currently, traditional NR reception is based on an OFDM (Orthogonal Frequency Division Multiplexing) receiver, which demodulates the LP-WUS signal through an accurate crystal oscillator or OFDM demodulator. However, the signal processing process of the OFDM receiver, crystal oscillator, and OFDM demodulator is complex, resulting in high power consumption. In addition, when the waveform carrying the LP-WUS signal has too many in-phase signals in the time domain, it will cause spikes in the frequency domain. If a channel with strong frequency selectivity is encountered, once the spike falls into the deep attenuation region, the entire signal loses a lot of energy, making it difficult to distinguish the obtained signal (such as the LP-WUS signal), reducing the signal detection accuracy and efficiency.

[0006] 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 the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field.

[0007] Summary of the Invention

[0008] The present disclosure provides a signal generation method, device and communication system, which at least to some extent overcome the problems of insufficient signal detection accuracy and low detection efficiency caused by signals (such as LP-WUS signals) that are difficult to distinguish in some cases in related technologies.

[0009] According to a first aspect of the present disclosure, there is provided a signal generating method, comprising:

[0010] A constant modulus sequence is used to replace part of the waveform of each period in the OOK waveform of the binary keying signal to be approximated. The constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0011] In one embodiment of the present disclosure, before replacing a portion of the waveform of each period in the OOK waveform to be approximated with the constant modulus sequence, the signal generation method further includes: generating the OOK waveform to be approximated based on the low power wake-up LP-WUS signal.

[0012] In one embodiment of the present disclosure, the signal generation method further includes: performing DFT transform precoding or least squares LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform, and generating a target transmission signal based on the frequency domain signal, wherein the target waveform is a waveform after replacing part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence.

[0013] According to a second aspect of the present disclosure, there is provided a signal generating device, comprising:

[0014] The waveform processing module replaces part of the waveform of each cycle in the OOK waveform to be approximated with a constant modulus sequence, where the constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0015] In one embodiment of the present disclosure, the waveform processing module is further configured to generate an OOK waveform to be approximated based on a low power wake-up LP-WUS signal.

[0016] In one embodiment of the present disclosure, the signal generating device further includes an optimization module.

[0017] An optimization module is used to perform DFT transform precoding or least squares LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform, and generate a target transmission signal based on the frequency domain signal, wherein the target waveform is a waveform after replacing part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence.

[0018] According to a third aspect of the present disclosure, there is provided a communication system, including:

[0019] The base station is used to replace part of the waveform of each cycle in the OOK waveform to be approximated with a constant modulus sequence to obtain the target waveform. The constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0020] Performing DFT transform precoding or least squares (LS) optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform, and generating a target transmit signal based on the frequency domain signal;

[0021] 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.

[0022] In one embodiment of the present disclosure, the base station is further configured to generate a low-frequency wake-up LP-WUS signal, and generate an OOK waveform to be approximated based on the LP-WUS signal.

[0023] According to a fourth aspect of the present disclosure, an electronic device is provided, including: a memory for storing instructions; and a processor for calling the instructions stored in the memory to implement the above-mentioned signal generation method.

[0024] According to a fifth aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored. When the computer instructions are executed by a processor, the above-mentioned signal generation method is implemented.

[0025] According to a sixth aspect of the present disclosure, a computer program product is provided. The computer program product stores instructions, which, when executed by a computer, enable the computer to implement the above-mentioned signal generation method.

[0026] According to a seventh aspect of the present disclosure, there is provided a chip comprising at least one processor and an interface;

[0027] An interface for providing program instructions or data to at least one processor;

[0028] At least one processor is configured to execute program instructions to implement the above-mentioned signal generating method.

[0029] The signal generation method, device and communication system provided by the embodiments of the present disclosure replace part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence, which can break up the OOK waveform to be approximated, improve the frequency diversity gain of the signal, and form an effect similar to spread spectrum, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), thereby improving the detection accuracy and detection efficiency of the signal, thereby improving the synchronization of NR reception and reducing energy consumption loss.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] Obviously, the drawings described below are only some embodiments of the present disclosure. A person skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0033] FIG1 schematically shows a system architecture diagram of a communication system to which a signal generation method is applied in an embodiment of the present application.

[0034] FIG2 schematically shows a flow chart of a signal generation method in an embodiment of the present application.

[0035] FIG3 schematically shows a flow chart of another signal generation method in an embodiment of the present application.

[0036] FIG4 schematically shows a schematic diagram of an OFDM baseband signal processing principle in an embodiment of the present application.

[0037] FIG5 schematically shows a signal interface diagram after the constant modulus sequence corresponding to each period is replaced with the same one according to the preset replacement rule in an embodiment of the present disclosure.

[0038] FIG6 schematically shows a signal interface diagram after the constant modulus sequence corresponding to each period is replaced with a different one according to the preset replacement rule in an embodiment of the present disclosure.

[0039] FIG7 schematically shows a signal interface diagram after a preset replacement rule is set in an embodiment of the present disclosure, in which a portion of the cycles have the same constant modulus sequences as those corresponding to the cycles.

[0040] FIG8 schematically shows a structural diagram of a signal generating device in an embodiment of the present disclosure.

[0041] FIG9 shows a structural block diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] Example embodiments will be described more fully hereinafter with reference to the accompanying drawings.

[0043] It should be noted that example embodiments may be implemented in many forms and should not be construed as limited to the examples set forth herein.

[0044] Among the related technologies in this field, Release 18 proposes a new topic for optimizing terminal device power consumption - low-power wake-up signal LP-WUS. It aims to further reduce the power of monitoring paging during DRX (Discontinuous Reception) by designing a simple modulation signal and a simple receiver. This allows the UE to further save energy in the idle / inactive state without incurring large transmission delays. This is very beneficial for the future deployment of UEs in vertical industries that do not have sustainable energy sources, such as sensors and alarms.

[0045] To reduce UE power consumption, the UE is equipped with a main radio module (MR) and a wake-up signal receiver separate from the MR. The MR, similar to a traditional NR UE, is used for signal transmission and reception and is mostly off or in deep sleep. Its power consumption is relatively high, typically in the milliwatt (mW) range. The wake-up signal receiver consumes less power, typically in the microwatt (μW) or even nanowatt (nW) range. When the wake-up signal receiver detects a wake-up signal, it activates the MR to implement basic UE functions, including radio resource management (RRM) measurements, paging, cell reselection and handover, and various application (app) layer functions.

[0046] Traditional NR reception is based on OFDM receivers, which require an accurate crystal oscillator or OFDM demodulator for demodulation. This complex signal processing process results in high power consumption. To reduce power consumption, a simple modulation signal and a simple receiver can be designed. Therefore, the LP-WUS signal from the base station is usually converted into a binary keying signal for transmission, such as OOK (On-Off Keying) or FSK (Frequency Shift Keying). OOK is more widely used. Compared to FSK, OOK can perform envelope detection using only a limited number of simple components and does not require a crystal oscillator. Therefore, multi-carrier OOK technology is usually used to modulate the LP-WUS signal to generate the NR signal, enabling better coexistence with other NR signals.

[0047] There are four OOK schemes: OOK-Option 1, OOK-Option 2, OOK-Option 3, and OOK-Option 4. OOK-Option 4 is a predistortion method that pregenerates a waveform and then uses operations similar to the discrete Fourier transform (DFT) to approximate the target waveform. This method offers the dual advantages of both speed and performance. Because OOK-Option 4 is an approximation method, it allows for arbitrary configuration of the time domain waveform by setting the corresponding number of signals carried on each OFDM symbol, achieving high-speed and high-performance signal transmission.

[0048] However, the main problem with the spectrum generated by OOK-Option 4 is that, to perfectly represent the "ON" waveform in the time domain, many consecutive sampling points are required to produce the same "ON" input. Excessive in-phase signals in the time domain lead to spikes in the frequency domain, and the frequency domain energy is too concentrated in the first half of the spectrum. In common 3GPP fast-fading channel scenarios, such as TDL-C 300ns, the vast majority of the energy is lost, causing complete waveform distortion at the receiver. Because the receiver uses envelope detection, the decision device cannot distinguish between high-level and low-level waveforms, regardless of the signal-to-noise ratio. This results in low LP-WUS signal detection accuracy and efficiency. Furthermore, the frequency domain energy in the second half of the spectrum is too low, making a minimal contribution to the overall performance, resulting in very low spectral efficiency.

[0049] Before describing the technical solutions in the embodiments of the present disclosure in detail, the technical terms that may be involved in the embodiments of the present disclosure are first explained and illustrated.

[0050] (1) LP-WUS: Low-Power Wake-Up Signal, used to wake up the main radio module MR in the UE.

[0051] (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.

[0052] (3) OOK-Option 4: A scheme for performing OOK modulation on the LP-WUS signal. It is a pre-distortion method that pregenerates a waveform and then approaches the target waveform through discrete Fourier transform or least squares optimization.

[0053] (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.

[0054] (5)LS optimization: Least Square, least squares optimization method.

[0055] (6) IFFT transform: Inverse Fast Fourier Transform, inverse fast Fourier transform.

[0056] After introducing the technical terms that may be involved in the embodiments of the present disclosure, the signal generating method in the present disclosure is described in detail.

[0057] FIG1 schematically shows a system architecture block diagram of a communication system to which the technical solution of the present disclosure is applied.

[0058] As shown in Figure 1, the system architecture 100 of the communication system may include a base station 101, an NR terminal 102 and a network, wherein the base station 101 is used to replace part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence, where the constant modulus sequence is a set of sequences with the same modulus value but different phases; the target waveform is subjected to DFT transform precoding or least squares LS optimization to obtain a frequency domain signal corresponding to the target waveform, and a target transmission signal is generated based on the frequency domain signal; the wake-up signal receiver in the NR terminal 102 is used to receive the target transmission signal transmitted through a multipath fading channel, demodulate and envelope detect the received target transmission signal, obtain an LP-WUS signal, and send the LP-WUS signal to the main wireless module in the NR terminal 102 to wake up the main wireless module; the network is a communication network, which is used to provide a data transmission link between the base station 101 and the NR terminal 102.

[0059] It can be understood that in the above embodiment, the target waveform can be obtained by replacing a portion of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence.

[0060] In some embodiments, the base station 101 is further configured to generate a low-frequency wake-up LP-WUS signal, and generate an OOK waveform of the binary keying signal to be approximated based on the LP-WUS signal.

[0061] It should be noted that the OOK waveform to be approximated may be an OOK modulation waveform before DFT precoding or LS optimization.

[0062] It's also important to note that each cycle in the OOK waveform refers to one 'on' chip, one 'off' chip, or a combination of an 'on' and an 'off' chip, as well as any repetitions. An 'on' chip represents a high-level state of the carrier signal, typically representing a data "1," while an 'off' chip represents a low-level state of the carrier signal, typically representing a data "0."

[0063] The technical solution provided by the embodiments of the present disclosure can be applied to a base station, where an LP-WUS signal is generated and subjected to modulation, waveform replacement processing, time-frequency conversion, and frequency domain repetitive mapping.

[0064] It should be noted that the technical solution provided by the embodiments of the present disclosure can also be applied to the generation process of the R2D waveform or PRDCH waveform of the passive Internet of Things.

[0065] FIG2 shows a flow chart of a signal generation method, which is applied to a base station, which may be the base station 101 in FIG1 . As shown in FIG2 , the signal generation method includes step S210 .

[0066] In S210 , a portion of the waveform of each period in the OOK waveform to be approximated is replaced by a constant modulus sequence, where the constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0067] It can be understood that in the above embodiment, the target waveform can be obtained by replacing a portion of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence.

[0068] The signal generation method of the present application replaces part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence, which can break up the OOK waveform to be approximated, improve the frequency diversity gain of the signal, and form an effect similar to spread spectrum, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), so as to improve the detection accuracy and detection efficiency of the signal, thereby improving the synchronization of NR reception and reducing energy consumption loss.

[0069] The signal generation method disclosed in the present invention 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 invention is described in detail below in conjunction with specific embodiments.

[0070] FIG3 shows a flow chart of a signal generation method, which is applied to a base station, which may be the base station 101 in FIG1 . As shown in FIG3 , the signal generation method includes step S310 .

[0071] In S310, based on the low power wake-up LP-WUS signal, an OOK waveform to be approximated is generated, and a part of the waveform of each period in the OOK waveform to be approximated is replaced by a constant modulus sequence to obtain a target waveform. The constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0072] The signal generation method of the present application, after obtaining the low-power wake-up LP-WUS signal, generates an OOK waveform of the binary keying signal to be approximated based on the LP-WUS signal, and then replaces part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain the target waveform. The signal generation method of the present application replaces part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence, which can break up the OOK waveform to be approximated generated based on the LP-WUS signal, improve the frequency diversity gain of the LP-WUS signal, and form an effect similar to spread spectrum, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), so as to improve the detection accuracy and detection efficiency of the LP-WUS signal, thereby improving the synchronization of NR reception and reducing energy consumption loss.

[0073] In the field of 5G and 5G+ mobile communications, signals are usually transmitted in a multi-carrier waveform, and the multi-carrier waveform is usually implemented based on the orthogonal frequency division multiplexing technology OFDM. OFDM is a type of multi-carrier modulation. It realizes parallel transmission of high-speed serial data through frequency division multiplexing. It has good resistance to multipath fading and can support multi-user access. Therefore, before explaining the signal generation method in this application in detail, the orthogonal frequency division multiplexing technology OFDM is first briefly explained.

[0074] Figure 4 schematically illustrates the principle of OFDM baseband signal processing. As shown in Figure 4, the signal processing process is divided into the transmitter (base station) signal processing process and the receiver (UE) signal processing process. At the transmitter, the bit stream is first modulated with QAM or QPSK. It then undergoes serial-to-parallel conversion and IFFT transformation, converting the parallel data into serial data. A guard interval (also known as a cyclic prefix) is added to form an OFDM symbol. During framing, a synchronization sequence and a channel estimation sequence are added to facilitate burst detection, synchronization, and channel estimation at the receiver. Finally, an orthogonal baseband signal is output. At the receiver, upon signal arrival, synchronization and channel estimation are first performed. After time synchronization, fractional frequency offset estimation, and correction are completed, the signal is subjected to FFT transformation and integer frequency offset estimation and correction. The resulting data is QAM or QPSK modulated data. Finally, this data is demodulated to obtain the bit stream.

[0075] 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 division can be performed according to the number of bits carried by each OFDM symbol. After completing the serial-to-parallel conversion, each signal block can be time-domain expanded and OOK modulation can be performed according to the OOK-Option 4 scheme to generate the OOK waveform to be approximated. The OOK waveform to be approximated is then processed. Based on a preset replacement rule, a constant modulus sequence is used to replace part of the waveform of each period in the OOK waveform to be approximated to obtain the target waveform. Finally, the target waveform is subjected to time-frequency conversion to obtain the corresponding frequency domain signal, and the frequency domain signal is mapped to the RE corresponding to each OFDM symbol. This is the modulation mapping process shown in Figure 4. Considering that at the transmitter, when the OOK-Option 4 scheme is used to perform OOK modulation on the bit stream, many consecutive 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 region, the entire signal loses a lot of energy, making it difficult to distinguish through envelope detection. Therefore, by performing waveform replacement processing on the approximate OOK waveform in the modulation mapping process, a constant modulus sequence is used to replace part of the waveform of each cycle in the OOK waveform to be approximated to obtain the target waveform. The final generated frequency domain signal is dispersed rather than concentrated together, thereby ensuring that the signal finally sent to the receiver has a high frequency diversity gain. When passing through a frequency-selective fading channel, it can still have good performance, ensuring the detection of LP-WUS signals.

[0076] 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 included is Mbit, and the number of bits that each OFDM symbol can carry is Then we can generate signal blocks, i.e. Each of these signal blocks is a signal block, and these signal blocks are processed in parallel during the modulation mapping process. Since the processing flow of each signal block is the same, in the embodiment of the present application, only the processing flow of one signal block is described.

[0077] In an exemplary embodiment of the present application, after obtaining a signal block, the signal block can be time-domain expanded and OOK modulated to generate an OOK waveform to be approximated. When the signal block is time-domain expanded, the number of sampling points corresponding to the method of performing time-frequency conversion on the target waveform after the waveform replacement processing can be expanded. In an embodiment of the present application, when the OOK waveform to be approximated is processed, based on a preset replacement rule, a constant modulus sequence is used to replace part of the waveform of each period in the OOK waveform to be approximated to obtain the target waveform, and then DFT transform precoding or LS optimization is used to process the target waveform. Therefore, the signal block can 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. This avoids truncation of the frequency domain signal according to the LP-WUS signal bandwidth size after completing DFT variable precoding. When the LP-WUS signal bandwidth size is less than the maximum number of carrying bits corresponding to the OFDM symbol, the portion of the OFDM symbol not covered by the extended signal is padded with zeros. When LS optimized sampling points are used for expansion, the sampling points can be set to any value between 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, the portion of the OFDM symbol not covered by the extended signal is still padded with zeros.

[0078] In an exemplary embodiment of the present application, when a signal block is time-domain expanded, each bit in the signal block is expanded by the same multiple, for example, one OFDM symbol is allocated to bits, the number of sampling points to be expanded is Then each bit needs to be expanded to In the embodiment of the present application, the extended signal block is marked as For ease of understanding, let's use an example to illustrate that when an OFDM symbol is assigned a signal block of 1101 and you want to expand the signal block to the LP-WUS signal bandwidth of 72, each bit needs to be expanded to 18 bits. In other words, the expanded signal block is composed of 18 ones, 18 ones, 18 zeros, and 18 ones, in that order.

[0079] 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.

[0080] In an exemplary embodiment of the present application, the OOK waveform to be approximated can be processed and, based on a preset replacement rule, a portion of the waveform in each cycle of the OOK waveform to be approximated can be replaced with a constant modulus sequence to obtain a target waveform, thereby improving the frequency diversity gain of the LP-WUS signal. Specifically, based on a preset replacement rule, the high-level ON waveform of the OOK waveform to be approximated can be replaced with a constant modulus sequence to obtain the target waveform.

[0081] In some embodiments, a constant modulus sequence is used to replace a portion of the waveform in each cycle of the OOK waveform to be approximated to obtain a target waveform. This can be based on a preset replacement rule, where a constant modulus sequence is used to replace a portion of the waveform in each cycle of the OOK waveform to be approximated to obtain a target waveform.

[0082] The preset replacement rules include: the constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, and the constant modulus sequences corresponding to some periods in multiple periods are the same.

[0083] In some embodiments, the constant modulus sequence includes one or more of the following sequences: a ZC sequence, a random quadrature amplitude modulation sequence, a CGS sequence, and a low PAPR sequence. In other words, the constant modulus sequence can be one of the above sequences or a combination thereof. The random quadrature amplitude modulation sequence can be a sequence consisting of BPSK or QPSK modulation symbols.

[0084] In some embodiments, a constant modulus sequence is used to replace a portion of each cycle of the OOK waveform to be approximated to obtain a target waveform. This can be achieved by replacing a high-level ON waveform of the OOK waveform to be approximated with the constant modulus sequence to obtain the target waveform. Accordingly, the preset replacement rules include the constant modulus sequence corresponding to each ON waveform being the same, the constant modulus sequence corresponding to each ON waveform being different, and the constant modulus sequence corresponding to some of the multiple ON waveforms being the same.

[0085] Figure 5 schematically shows a signal interface diagram after replacement, where the preset replacement rule is that the constant modulus sequence corresponding to each period is the same. As shown in Figure 5, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, the high-voltage waveform occupies 4 bits, and the high-voltage waveform is replaced by the constant modulus sequence 1.

[0086] Figure 6 schematically shows a signal interface diagram after replacement in which the constant modulus sequence corresponding to each period is different under the preset replacement rule. As shown in Figure 6, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, the high-voltage waveform occupies 4 bits, and the high-voltage waveform is replaced with different constant modulus sequences, that is, with constant modulus sequence 1 and constant modulus sequence 2.

[0087] Figure 7 schematically shows a signal interface diagram after replacement when the preset replacement rule is that the constant modulus sequences corresponding to some periods in multiple periods are the same. As shown in Figure 7, the extended signal block corresponding to one OFDM symbol is {11110000111100001111000011110000}, and the high-voltage waveform is replaced by two constant modulus sequences 1 and two constant modulus sequences 2.

[0088] In an exemplary embodiment of the present application, after obtaining the target waveform, the target waveform can also be subjected to DFT transform precoding or least squares LS optimization to obtain a frequency domain signal corresponding to the target waveform. Furthermore, a target transmission signal sent to the UE end can be generated based on the frequency domain signal.

[0089] In the exemplary embodiments of the present application, similar to processing the OOK waveform to be approximated and replacing part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain the target waveform, DFT transform precoding or LS optimization can also be divided into matrix-level operations and signal-level operations. Since matrix-level DFT transform precoding is a commonly used signal transformation method in the field, 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.

[0090] (1) Matrix-level LS optimization scheme

[0091] 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.

[0092] OOK waveform generation based on LS optimization is divided into a non-shifting basic generation method and a shifting extended generation method. Among them, the LS optimized approximate expression corresponding to the non-shifting basic generation method is shown in formula (1):

[0093] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse Fourier transform matrix,

[0094] G is the interception matrix,

[0095] b n For extended signal blocks.

[0096] Expanding the approximation after LS optimization, we get the expression shown in (2):

[0097] Expression (2) is a very typical FFT transformation. The elements in each matrix are constructed by different FFT orthogonal bases, so the final DFT transformation result will be obtained. At the same time, the truncation matrix G is composed of an L-long square matrix and all 0s, aiming to extract the elements of the target bandwidth length L, and the remaining 0s in the result will be discarded in the mapping. Since the bandwidth is only L long, corresponding to the number of elements contained in the final column vector, it is equivalent to b n The FFT transform of n points is shortened to L length through this LS optimization.

[0098] Based on the shiftable extended generation method, the LS optimization mapping of different frequency domain positions is achieved by using the phase transformation factor. The approximate expression of the LS optimization corresponding to the shiftable extended generation method is shown in formula (3):

[0099] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse matrix of Fourier transform; G is the intercept matrix; b n is the extended signal block; s w is the phase adjustment matrix of the current bit based on the mapping position, k c is the starting position of frequency domain mapping.

[0100] 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 (2) can be obtained according to formula (3), as shown in expression (4):

[0101] According to formula (3), 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 (5):

[0102] For the shiftable extension generation method described above, although a good approximation effect can be achieved, the spectrum energy is too concentrated. When passing through a channel with strong frequency selectivity, once the peak falls into the deep attenuation area, most of the energy will be lost, causing the waveform at the receiving end to be completely distorted. In view of this, before using formula (3) to obtain the frequency domain signal, a constant modulus sequence can be used to replace part of the waveform of each cycle in the OOK waveform to be approximated to obtain the target waveform, and then the corresponding frequency domain signal can be obtained based on formula (3). The expression of the frequency domain signal obtained after LS optimization is shown in formula (6):

[0103] Among them, α μ is a sequence for waveform replacement processing, which is the same as the sequence α described above. l (m i ) is equivalent to; 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.

[0104] By expanding formula (6), we can get the frequency domain signal after LS optimization as shown in formula (7):

[0105] Among them, the rightmost sequence is the final generated frequency domain signal, in which each signal is mapped to a different RE on the same OFDM symbol. 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 bit signal is 1, and the phase information corresponding to the 1st bit signal is The phase information corresponding to the second signal is The phase information corresponding to the R-1th bit signal is Since the signals on different REs have different phase information, the spectrum signals are 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.

[0106] (2) Signal-level DFT transform precoding scheme

[0107] 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 solution of the present application, the method of performing signal-level processing on the target waveform in the embodiment of the present application to obtain the corresponding frequency domain signal is explained below.

[0108] In an exemplary embodiment of the present application, a corresponding frequency domain signal can be obtained by performing DFT transform precoding or LS optimization on the signal in the target waveform. When performing DFT transform precoding, the number of sampling points of the 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 (8):

[0109] 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; The signal block corresponding to the lth OFDM symbol is also referred to as a waveform replacement signal block. It is understood that the above signal block refers to the bits mapped to each OFDM symbol or the time-domain expanded bits mapped to each OFDM symbol.

[0110] In an exemplary embodiment of the present application, according to formula (8), only a unique set of (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 (8):

[0111] It is worth noting that the coefficients in formula (8) 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.

[0112] (3) Signal-level LS optimization solution

[0113] In an exemplary embodiment of the present application, when the LS optimization scheme is used to perform time-frequency conversion of a signal, the number of sampling points is greater than or equal to the bandwidth size. That is, the number of frequency domain points can be equal to or greater than the number of time domain points. In an embodiment of the present application, LS optimization can be performed according to formula (9), as follows:

[0114] 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 signal block corresponding to the OFDM symbol with an index of 1, wherein the signal block corresponding to the OFDM symbol with an index of 1 may also be referred to as a waveform replacement signal block. It will be understood that the above signal block refers to bits mapped to each OFDM symbol or bits mapped to each OFDM symbol after time domain expansion.

[0115] In an exemplary embodiment of the present application, similar to the DFT transform precoding scheme, according to formula (9), 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. This frequency domain signal corresponds to the frequency domain signal in the frequency domain signal sequence shown in formula (7). 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 (9):

[0116] It is worth noting that the power control factor β in formula (9) is used to ensure that the average value of the signal-noise ratio (SNR or S / N) is the same as the signal-noise ratio in the physical downlink shared channel (PDSCH). Furthermore, it can also be used to ensure that the average value of the signal-to-interference ratio (SIR) is the same as the signal-to-interference ratio in the PDSCH, and the average value of the signal-to-interference and noise ratio (SINR) is the same as the signal-to-interference and noise ratio in the PDSCH.

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

[0118] In an exemplary embodiment of the present application, after obtaining a frequency domain signal corresponding to a target waveform, a target transmission signal may be generated based on the frequency domain signal. The target transmission signal is a signal including an LP-WUS signal sent to a UE.

[0119] Among them, when generating the target transmitting 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 and mapped to the RE in the OFDM modulator. Then, the received frequency domain signal is OFDM modulated by the OFDM modulator to obtain a target OOK waveform that approximates the OOK waveform to be approximated. Furthermore, the target transmitting signal can be constructed according to the target OOK waveform. Continuing with the OFDM baseband signal processing principle diagram shown in Figure 3 as an example, after all signal blocks corresponding to the LP-WUS signal are processed according to the above embodiment to generate corresponding frequency domain signals, the frequency domain signals can be mapped to different REs in the OFDM modulator, and then the frequency domain signals corresponding to different signal blocks are subjected to frequency domain-time domain conversion processing. For example, the Inverse Fast Fourier Transform (IFFT) method can be used to perform frequency domain-time domain conversion processing to obtain a time domain signal corresponding to the input frequency domain signal. Then, the time domain signals corresponding to different signal blocks can be parallel-to-serial converted, and the time domain signals corresponding to different signal blocks can be spliced ​​in sequence to obtain the target OOK waveform. Finally, in order to ensure the security of signal transmission, a protection interval can be added to the target OOK waveform, such as padding the protection interval with zeros or adding a cyclic prefix to avoid inter-symbol interference. At this point, the target transmitted signal can be obtained.

[0120] 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 receiving the target transmission signal, the wake-up signal receiver in the UE end can perform envelope detection on the target transmission signal to obtain the LP-WUS signal. The processing flow of the wake-up signal receiver on the target transmission signal is the same as the receiving end processing flow shown in Figure 4, and the present embodiment will not be repeated here.

[0121] According to the signal generation method in the embodiment of the present application, before the DFT transform precoding or LS optimization is performed on the OOK waveform to be approximated, a constant modulus sequence is used to replace part of the waveform in each period of the OOK waveform to be approximated to obtain the target 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, even if it passes through a deep fade area, most of the energy will not be lost, and the target signal has strong anti-fading capability, thereby ensuring the integrity of the LP-WUS signal received by the UE. When the envelope detection method is used for signal detection, high-level waveforms and low levels 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.

[0122] Furthermore, the wake-up signal receiver can wake up the main radio module MR in the UE according to the demodulated LP-WUS signal, ensuring signal synchronization between the MR and the base station, realizing basic functions of the UE, and achieving the purpose of saving energy consumption.

[0123] Furthermore, although the steps of the methods of the present disclosure are depicted in a particular order in the drawings, this does not require or imply that the steps must be performed in this particular order, or that all illustrated steps must be performed to achieve desired results.

[0124] In some embodiments, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0125] Based on the same inventive concept, the present disclosure also provides a signal generating device, such as the following embodiment. Since the principle of solving the problem in the device embodiment is similar to that in the above method embodiment, the implementation of the device embodiment can refer to the implementation of the above method embodiment, and the repeated parts will not be repeated.

[0126] FIG8 shows a schematic diagram of a signal generating device according to an embodiment of the present disclosure. As shown in FIG8 , the signal generating device 800 includes:

[0127] The waveform processing module 802 replaces a portion of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence, where the constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0128] In some embodiments, the waveform processing module 802 is further configured to generate an OOK waveform to be approximated based on the low power wake-up LP-WUS signal.

[0129] In some embodiments, the waveform processing module 802 replaces a portion of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain a target waveform.

[0130] In some embodiments, the signal generating device further comprises an optimization module.

[0131] The optimization module is used to perform DFT transform precoding or least squares LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform, and generate a target transmission signal based on the frequency domain signal.

[0132] In some embodiments, the waveform processing module 802 is configured to replace the high-level ON waveform of the OOK waveform to be approximated with a constant modulus sequence based on a preset replacement rule to obtain a target waveform.

[0133] In some embodiments, the waveform processing module 802 is configured to replace a portion of each cycle of the OOK waveform to be approximated with a constant modulus sequence based on a preset replacement rule to obtain a target waveform, wherein the preset replacement rule includes:

[0134] The constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, and the constant modulus sequences corresponding to some periods in multiple periods are the same.

[0135] In some embodiments, the constant modulus sequence includes one or more of the following sequences:

[0136] ZC sequence, random orthogonal amplitude modulation sequence, CGS sequence, low PAPR sequence.

[0137] In some embodiments, the waveform processing module 802 generates an OOK waveform to be approximated based on the low-power wake-up LP-WUS signal, including: rate matching 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 to divide the LP-WUS signal into multiple signal blocks; and performing time domain expansion and OOK modulation on each signal block to obtain an OOK waveform to be approximated corresponding to each signal block.

[0138] In some embodiments, the waveform processing module 802, before replacing part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain the target waveform, further includes: performing time domain expansion on the signal block according to DFT transform precoding or least squares LS optimization corresponding to the number of sampling points, and performing OOK modulation on the extended signal block obtained by the time domain expansion to obtain the OOK waveform to be approximated.

[0139] In some embodiments, performing time domain expansion on a signal block according to the number of sampling points corresponding to DFT transform precoding or least squares method LS optimization includes:

[0140] When DFT-variant precoding is performed on the target waveform, the signal blocks corresponding to each OFDM symbol are time-domain expanded according to the number of sampling points corresponding to the bandwidth of the LP-WUS signal, and the parts of the OFDM symbol not covered by the expanded signal are padded with zeros;

[0141] When LS optimization is performed on the target waveform, the signal block corresponding to each OFDM symbol is time-domain expanded according to the number of sampling points corresponding to the LS optimization, and the part of the OFDM symbol not covered by the expanded signal is filled with zeros.

[0142] In some embodiments, the optimization module performs DFT transform precoding on the target waveform to obtain a frequency domain signal corresponding to the target waveform, including:

[0143] 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:

[0144] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; The signal block corresponding to the lth OFDM symbol is also referred to as a waveform replacement signal block. It is understood that the above signal block refers to the bits mapped to each OFDM symbol or the time-domain expanded bits mapped to each OFDM symbol.

[0145] In some embodiments, performing LS optimization on a target waveform to obtain a frequency domain signal corresponding to the target waveform includes:

[0146] The frequency domain signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, the bandwidth of the LP-WUS signal in the frequency domain, and the number of sampling points corresponding to the LS optimization satisfy the relationship:

[0147] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, which ranges from Increasing in sequence; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from Increasing in sequence; Optimize the number of sampling points corresponding to LS; is the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor; is the signal block corresponding to the lth OFDM symbol, wherein the signal block corresponding to the OFDM symbol indexed as 1 can also be referred to as a waveform replacement signal block. It is understood that the above signal block refers to the bits mapped to each OFDM symbol or the time-domain expanded bits mapped to each OFDM symbol.

[0148] In some embodiments, performing LS optimization on a target waveform to obtain a frequency domain signal corresponding to the target waveform includes:

[0149] The target waveform is optimized by LS according to the interception matrix, the inverse Fourier transform matrix, and the phase transformation factor, where the frequency domain signal and the target waveform, the interception matrix, the inverse Fourier transform matrix, and the phase transformation factor satisfy the relationship:

[0150] Among them, X LS is the frequency domain signal sequence, X LS Each element in is a frequency domain signal mapped to different resource elements RE; is the interception 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 ;

[0151] is the phase change factor, k c is the starting position of frequency domain mapping, which can be on any RE of any resource block RB; α μ b N is the target waveform; α μ is a sequence; b N is the OOK waveform to be approximated.

[0152] In some embodiments, generating a target transmit signal based on the frequency domain signal includes:

[0153] Mapping the frequency domain signal corresponding to the RE on each OFDM symbol to the RE in the OFDM modulator;

[0154] The frequency domain signal is OFDM modulated by an OFDM modulator to obtain a target OOK waveform that is close to the OOK waveform to be approximated, and a target transmission signal is constructed according to the target OOK waveform.

[0155] In some embodiments, the target transmission signal is sent to a wake-up signal receiver in the user terminal UE through a multipath fading channel, envelope detection is performed on the target transmission signal by the wake-up signal receiver to obtain an LP-WUS signal, and the main wireless module is woken up based on the LP-WUS signal.

[0156] The concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0157] Regarding the signal generating device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the signal generating method, and will not be elaborated here.

[0158] It should be noted that although several modules or units of the device for action execution are mentioned in the above detailed description, such division is not mandatory.

[0159] In fact, according to the embodiment of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0160] Some of the blocks shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0161] The electronic device provided by an embodiment of the present disclosure is described below with reference to Figure 9. The electronic device 900 shown in Figure 9 is merely an example and should not limit the functions and scope of use of the embodiment of the present disclosure.

[0162] FIG9 shows a schematic diagram of the architecture of an electronic device 900 provided by an embodiment of the present disclosure. As shown in FIG9 , the electronic device 900 includes but is not limited to: at least one processor 910 and at least one memory 920 .

[0163] The memory 920 is used to store instructions.

[0164] In some embodiments, the memory 920 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 9201 and / or a cache memory unit 9202 , and may further include a read-only memory unit (ROM) 9203 .

[0165] In some embodiments, the memory 920 may also include a program / utility 9204 having a set (at least one) of program modules 9205, such program modules 9205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0166] In some embodiments, the memory 920 may store an operating system, which may be a real-time operating system (RTX), LINUX, UNIX, WINDOWS, or OS X.

[0167] In some embodiments, data may also be stored in the memory 920 .

[0168] As an example, the processor 910 may read data stored in the memory 920 . The data may be stored at the same storage address as the instruction, or the data may be stored at a different storage address than the instruction.

[0169] The processor 910 is configured to call instructions stored in the memory 920 to implement the steps of various exemplary embodiments of the present disclosure described in the "Exemplary Method" section above. For example, the processor 910 may execute the steps of the aforementioned method embodiments.

[0170] It should be noted that the processor 910 may be a general-purpose processor or a dedicated processor. The processor 910 may include one or more processing cores, and the processor 910 executes various functional applications and data processing by running instructions.

[0171] In some embodiments, the processor 910 may include a central processing unit (CPU) and / or a baseband processor.

[0172] In some embodiments, the processor 910 may determine an instruction according to the priority identifier and / or function category information carried in each control instruction.

[0173] In the present disclosure, the processor 910 and the memory 920 may be provided separately or integrated together.

[0174] As an example, the processor 910 and the memory 920 may be integrated on a single board or a system on chip (SOC).

[0175] 9 , the electronic device 900 is implemented as a general-purpose computing device and may further include a bus 930 .

[0176] Bus 930 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures.

[0177] The electronic device 900 may also communicate with one or more external devices 940 (e.g., a keyboard, a pointing device, a Bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 900, and / or any device that enables the electronic device 900 to communicate with one or more other computing devices (e.g., a router, a modem, etc.). Such communication may be performed through an input / output (I / O) interface 950.

[0178] Furthermore, the electronic device 900 can also communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through the network adapter 960 .

[0179] As shown in FIG. 9 , the network adapter 960 communicates with other modules of the electronic device 900 through the bus 930 .

[0180] It should be understood that although not shown in the figures, other hardware and / or software modules may be used in conjunction with the electronic device 900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0181] It should be understood that the structure illustrated in the embodiments of the present disclosure does not constitute a specific limitation on the electronic device 900. In other embodiments of the present disclosure, the electronic device 900 may include more or fewer components than those shown in FIG9 , or may combine or separate certain components, or may have different component arrangements. The components shown in FIG9 may be implemented in hardware, software, or a combination of software and hardware.

[0182] The present disclosure also provides a computer-readable storage medium having computer instructions stored thereon. When the computer instructions are executed by a processor, the signal generating method described in the above method embodiment is implemented.

[0183] The computer-readable storage medium in the embodiments of the present disclosure is a computer instruction that can be sent, propagated or transmitted for use by or in conjunction with an instruction execution system, apparatus or device.

[0184] As an example, computer readable storage media are non-volatile storage media.

[0185] In some embodiments, more specific examples of computer-readable storage media in the present disclosure may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, a USB flash drive, a mobile hard disk, or any suitable combination of the foregoing.

[0186] In the embodiments of the present disclosure, the computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer instructions (readable program codes).

[0187] Such a propagated data signal may take any of a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof.

[0188] In some examples, computing instructions contained on a computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0189] The embodiments of the present disclosure further provide a computer program product, which stores instructions. When the instructions are executed by a computer, the computer implements the signal generation method described in the above method embodiment.

[0190] The above instructions may be program codes. In specific implementation, the program codes may be written in any combination of one or more programming languages.

[0191] Programming languages ​​include object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages.

[0192] The program code may execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server.

[0193] Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0194] The embodiment of the present disclosure further provides a chip, comprising at least one processor and an interface;

[0195] An interface for providing program instructions or data to at least one processor;

[0196] At least one processor is configured to execute program instructions to implement the signal generating method described in the above method embodiment.

[0197] In some embodiments, the chip may further include a memory for storing program instructions and data, and the memory may be located inside or outside the processor.

[0198] Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation combining hardware and software, which may be collectively referred to herein as a "circuit," "module," or "system."

[0199] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein.

[0200] This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A signal generation method, characterized in that: include: A part of the waveform of each period in the OOK waveform of the binary keying signal to be approximated is replaced by a constant modulus sequence, wherein the constant modulus sequence is a set of sequences with the same modulus value but different phases.

2. The method according to claim 1, characterized in that Before replacing a portion of each cycle of the binary keying signal OOK waveform to be approximated with a constant modulus sequence, the method further comprises: Based on the low power wake-up LP-WUS signal, an OOK waveform to be approximated is generated.

3. The method according to claim 1, characterized in that Substitute a portion of each cycle of the OOK waveform to be approximated with a constant modulus sequence, including: Based on the preset substitution rule, the high-level ON waveform to be approximated by the OOK waveform is replaced by a constant modulus sequence to obtain the target waveform.

4. The method according to claim 1 or 3, characterized in that: Substitute a portion of each cycle of the OOK waveform to be approximated with a constant modulus sequence, including: Based on a preset substitution rule, a part of the waveform of each period in the OOK waveform to be approximated is replaced by a constant modulus sequence to obtain a target waveform, wherein the preset substitution rule includes: The constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, and the constant modulus sequences corresponding to some periods in multiple periods are the same.

5. The method according to claim 1, characterized in that The constant modulus sequence includes one or more of the following sequences: ZC sequence, random orthogonal amplitude modulation sequence, CGS sequence, low PAPR sequence.

6. The method according to claim 2, 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.

7. The method according to claim 6, characterized in that Before replacing a portion of the waveform of each period in the OOK waveform to be approximated with the constant modulus sequence, the method further includes: The signal block is time-domain extended according to the DFT transform precoding or the least square method LS optimization corresponding sampling point number, and the extended signal block obtained by the time domain extension is OOK modulated to obtain Take the OOK waveform to be approximated.

8. The method according to claim 7, 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 target 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 of the LP-WUS signal, and a portion of the OFDM symbol not covered by the extended signal is filled with zeros; When the target 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.

9. The method according to claim 1, characterized in that: The method further comprises: The target waveform is subjected to DFT transform precoding or least squares LS optimization to obtain a frequency domain signal corresponding to the target waveform, and a target transmission signal is generated based on the frequency domain signal, wherein the target waveform is a waveform obtained by replacing a portion of the waveform in each period of the OOK waveform to be approximated with a constant modulus sequence.

10. The method according to claim 9, characterized in that The performing DFT transformation precoding on the target waveform to obtain a frequency domain signal corresponding to the target 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: 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 signal block corresponding to the lth OFDM symbol.

11. The method according to claim 9, characterized in that The step of performing LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform includes: The frequency domain signal and the index of 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: 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 signal block corresponding to the lth OFDM symbol.

12. The method according to claim 9, characterized in that The step of performing LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform includes: The target waveform is subjected to LS optimization according to the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor, wherein the frequency domain signal and the target waveform, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor satisfy the relationship: 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 target waveform; α μ is the sequence; b N is the OOK waveform to be approximated.

13. The method according to any one of claims 10 to 12, 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.

14. The method according to claim 9, 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.

15. A signal generating device, characterized in that: include: The waveform processing module replaces a part of the waveform of each period in the binary keying signal OOK waveform to be approximated with a constant modulus sequence, wherein the constant modulus sequence is a set of sequences with the same modulus value but different phases.

16. The signal generating device according to claim 15, characterized in that: The waveform processing module is also used to generate an OOK waveform to be approximated based on a low-power wake-up LP-WUS signal.

17. The signal generating device according to claim 15 or 16, 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 a target waveform to obtain a frequency domain signal corresponding to the target waveform, and generate a target transmission signal based on the frequency domain signal, wherein the target waveform is a waveform obtained by replacing a part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence.

18. A communication system, characterized in that: include: A base station is used to replace each cycle in the OOK waveform of the binary keying signal to be approximated with a constant modulus sequence. The partial waveform of the period is used to obtain the target waveform, wherein the constant modulus sequence is a set of sequences with the same modulus value but different phases; Performing DFT transform precoding or least squares LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target 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.

19. The communication system according to claim 18, characterized in that: The base station is further used to generate a low-frequency wake-up LP-WUS signal, and generate an OOK waveform to be approximated based on the LP-WUS signal.

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