Signal generation method and device and communication system

Abstract

The invention provides a signal generation method and device and a communication system, and relates to the technical field of wireless communication and terminals. The method comprises the steps that on the basis of a low-power wake-up LP-WUS signal, a binary keying signal OOK waveform to be approximated is generated, a constant modulus sequence is used for replacing a part of waveform of each period in the OOK waveform to be approximated so as to obtain a target waveform, and the constant modulus sequence is a set of sequences with the same modulus value but different phases. According to the embodiment of the invention, the to-be-approximated OOK waveform generated based on the LP-WUS signal can be scattered, the frequency diversity gain of the LP-WUS signal is improved, and an effect similar to spread spectrum is formed, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), the detection precision and the detection efficiency of the LP-WUS signal are improved, and the detection efficiency of the LP-WUS signal is improved. And therefore, the NR receiving synchronism is improved, and the energy consumption loss is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communications and terminal technologies, and in particular to a signal generating method, device and 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 the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present disclosure provides a signal generation method, device and communication system, which at least to some extent overcome the problems of insufficient detection accuracy and low detection efficiency of LP-WUS signals caused by the difficulty in distinguishing LP-WUS signals in some cases in the related art.

[0006] According to a first aspect of the present disclosure, there is provided a signal generating method, comprising:

[0007] Based on the low-power wake-up LP-WUS signal, the binary keying signal OOK waveform to be approximated is generated, and a part of the waveform in each period of the OOK waveform to be approximated is replaced by 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.

[0008] According to a second aspect of the present disclosure, there is provided a signal generating device, comprising:

[0009] The waveform processing module generates an OOK waveform to be approximated based on the low-power wake-up LP-WUS signal, and 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 constant modulus sequence is a set of sequences with the same modulus value but different phases.

[0010] According to a third aspect of the present disclosure, there is provided a communication system, including:

[0011] The base station is used to generate a low-frequency wake-up LP-WUS signal, and generate an OOK waveform of a binary keying signal to be approximated based on the LP-WUS signal;

[0012] Based on the low-power wake-up LP-WUS signal, an OOK waveform of the binary keying signal 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.

[0013] 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;

[0014] 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.

[0015] 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.

[0016] According to a fifth aspect of the present disclosure, there is provided a computer-readable storage medium on which computer instructions are stored, and the computer instructions implement the above-mentioned signal generation method when executed by a processor.

[0017] According to a sixth aspect of the present disclosure, a computer program product is provided. The computer program product stores instructions, and when the instructions are executed by a computer, the computer implements the above-mentioned signal generation method.

[0018] According to a seventh aspect of the present disclosure, there is provided a chip, comprising at least one processor and an interface;

[0019] An interface for providing program instructions or data to at least one processor;

[0020] At least one processor is used to execute program instructions to implement the above signal generating method.

[0021] The signal generation method, device and communication system provided by the embodiments of the present disclosure, 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 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 a spread spectrum-like effect, 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 losses.

[0022] 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 present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can obtain other drawings based on these drawings without any creative work.

[0025] 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.

[0026] Figure 2 The flowchart of the signal generation method in the embodiment of the present application is schematically shown.

[0027] Figure 3 The schematic diagram shows the principle diagram of OFDM baseband signal processing in an embodiment of the present application.

[0028] Figure 4 The schematic diagram shows a signal interface diagram after replacing the constant modulus sequence corresponding to each period with the same replacement rule in the embodiment of the present disclosure.

[0029] Figure 5 The schematic diagram shows a signal interface diagram after the constant modulus sequence corresponding to each period is replaced with different ones according to the preset replacement rule in the embodiment of the present disclosure.

[0030] Figure 6 A schematic diagram shows a signal interface diagram after a preset replacement rule in an embodiment of the present disclosure is replaced when the constant modulus sequences corresponding to some periods in a plurality of periods are the same.

[0031] Figure 7 The structural diagram of the signal generating device in the embodiment of the present disclosure is schematically shown.

[0032] Figure 8 A structural block diagram of an electronic device in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] Example embodiments will be described more fully hereinafter with reference to the accompanying drawings.

[0034] It should be noted that example embodiments may be implemented in many forms and should not be construed as being limited to the examples set forth herein.

[0035] 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.

[0036] 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 role of traditional NRUE, 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.

[0037] 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.

[0038] There are four 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 approaches the target waveform with the help of discrete Fourier transform DFT-like operations. 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.

[0039] 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 generate the same "ON" input, and 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, causing the waveform at the receiving end to be completely distorted. Since the receiving end uses envelope detection, no matter how high the signal-to-noise ratio is, the decision device cannot distinguish between high-level waveforms and low-level waveforms, resulting in low detection accuracy and efficiency of LP-WUS signals. At the same time, the frequency domain energy in the second half of the spectrum is too low, and the overall contribution is very small, resulting in very low spectrum efficiency.

[0040] 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.

[0041] (1) LP-WUS: Low-Power Wake-Up Signal, used to wake up the main radio module MR in the UE.

[0042] (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.

[0043] (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.

[0044] (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.

[0045] (5)LS optimization: Least Square, least squares optimization method.

[0046] (6) IFFT transform: Inverse Fast Fourier Transform, inverse fast Fourier transform.

[0047] 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.

[0048] Figure 1 The system architecture block diagram of a communication system applying the technical solution of the present disclosure is schematically shown.

[0049] like Figure 1 As 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 a low-frequency wake-up LP-WUS signal, and generate an OOK waveform of a binary keying signal to be approximated based on the LP-WUS signal; based on the low-power wake-up LP-WUS signal, generate an OOK waveform of a binary keying signal to be approximated, and replace a part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain a target waveform, wherein the constant modulus sequence is a set of sequences with the same modulus value but different phases; 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; the wake-up signal receiver in the NR terminal 102 is used to receive a 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 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.

[0050] The technical solution provided by the embodiments of the present disclosure can be applied to a base station, which generates an LP-WUS signal and performs modulation, waveform replacement, time-frequency conversion, frequency domain repetition mapping and other processing on the LP-WUS signal.

[0051] The signal generation method in the present disclosure 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 by the present disclosure is described in detail below in conjunction with specific implementations.

[0052] 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 generating method includes step S210.

[0053] In S210, 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.

[0054] The signal generation method 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 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 a spread spectrum-like effect, 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 losses.

[0055] 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.

[0056] Figure 3 The schematic diagram of OFDM baseband signal processing is shown as follows: Figure 3As 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.

[0057] In an exemplary embodiment of the present application, the essence of performing serial-to-parallel conversion on the LP-WUS signal is to divide the LP-WUS signal into multiple signal blocks. 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 expanded in the time domain, and OOK modulation can be performed according to the OOK-Option 4 scheme to generate an OOK waveform to be approximated. The OOK waveform to be approximated is then processed, and 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 a target waveform. Finally, the target waveform is transformed in time-frequency to obtain a 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, by performing waveform replacement processing on the OOK waveform to be approximated 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 so that the final generated frequency domain signal is dispersed rather than concentrated together, thereby ensuring that the signal finally sent to the receiving end has a high frequency diversity gain, and can still have good performance when passing through a frequency selective fading channel, ensuring the detection of the LP-WUS signal.

[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 M bit , 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 can be time-domain expanded and OOK modulated to generate an OOK waveform to be approximated. When the signal block is time-domain expanded, it can be expanded according to the number of sampling points corresponding to the method of performing time-frequency conversion on the target waveform after the waveform replacement processing. In an embodiment of the present application, when the OOK waveform to be approximated is processed, based on a preset replacement rule, a part of the waveform of each period in the OOK waveform to be approximated is replaced with a constant modulus sequence 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, 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 OOK waveform to be approximated can be processed, and based on a preset replacement rule, a part of the waveform of each period in the OOK waveform to be approximated can be replaced with a constant modulus sequence to obtain a target waveform, so as to improve the frequency diversity gain of the LP-WUS signal. Specifically, based on a preset replacement rule, a high-level ON waveform of the OOK waveform to be approximated can be replaced with a constant modulus sequence to obtain a target waveform.

[0063] In some embodiments, 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. This can be based on a preset replacement rule, where 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.

[0064] 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.

[0065] In some embodiments, the constant modulus sequence includes one or more of the following sequences: a ZC sequence, a random orthogonal amplitude modulation sequence, a CGS sequence, and a low PAPR sequence. That is, the constant modulus sequence can be one of the above sequences, or a combination of the above sequences. Among them, the random orthogonal amplitude modulation sequence can be a sequence composed of BPSK or QPSK modulation symbols.

[0066] In some embodiments, a part of the waveform in each cycle of the OOK waveform to be approximated is replaced by a constant modulus sequence to obtain a target waveform, and the target waveform can be obtained by replacing the high-level ON waveform of the OOK waveform to be approximated by a constant modulus sequence. Accordingly, the preset replacement rule includes that the constant modulus sequence corresponding to each ON waveform is the same, the constant modulus sequence corresponding to each ON waveform is different, and the constant modulus sequences corresponding to some ON waveforms in multiple ON waveforms are the same.

[0067] Figure 4 The schematic diagram shows that the preset replacement rule is the same as the constant modulus sequence corresponding to each cycle, and the signal interface diagram after replacement is shown as follows: Figure 4 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, the high potential waveform occupies 4 bits, and the high potential waveform is replaced by the constant modulus sequence 1.

[0068] Figure 5 The schematic diagram shows that the preset replacement rule is that the constant modulus sequence corresponding to each period is different, and the signal interface diagram after replacement is shown as follows: Figure 5 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, the high potential waveform occupies 4 bits, and the high potential waveform is replaced with different constant modulus sequences, that is, replaced with constant modulus sequence 1 and constant modulus sequence 2.

[0069] Figure 6 The schematic diagram shows that the preset replacement rule is that the constant modulus sequences corresponding to some periods in multiple periods are the same, and the signal interface diagram after replacement is shown, such as Figure 6 As shown, the extended signal block corresponding to one OFDM symbol is {11110000111100001111000011110000}, and the high potential waveform is replaced by two constant modulus sequences 1 and two constant modulus sequences 2.

[0070] 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 can be generated based on the frequency domain signal.

[0071] In an exemplary embodiment of the present application, similar to processing the OOK waveform to be approximated, replacing part of the waveform of each period in the OOK waveform to be approximated with a constant modulus sequence to obtain a 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 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.

[0072] (1) Matrix-level LS optimization scheme

[0073] 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.

[0074] 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 (1):

[0075]

[0076] Among them, x LS is the frequency domain signal after LS optimization; F inv is the inverse Fourier transform matrix, G is the interception matrix, b n For the extended signal block.

[0077] Expanding the approximation after LS optimization, we get the expression shown in (2):

[0078]

[0079] Expression (2) 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.

[0080] 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 (3):

[0081]

[0082] 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, k c is the starting position of frequency domain mapping.

[0083] 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):

[0084]

[0085] 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):

[0086]

[0087] 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 (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 is obtained based on formula (3). The expression of the frequency domain signal obtained after LS optimization is shown in formula (6):

[0088]

[0089] Among them, α μ is a sequence used for waveform replacement processing, which is the same as the sequence α1(m i ) is equivalent to; b n is an extended signal sequence, which is equivalent to the extended signal block b1(i) described above, that is, b n is a sequence consisting of spread signals corresponding to the same OFDM symbol.

[0090] By expanding formula (6), the frequency domain signal after LS optimization can be obtained as shown in formula (7):

[0091]

[0092] 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.

[0093] (2) Signal-level DFT transform precoding scheme

[0094] 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 target waveform in an embodiment of the present application to obtain the corresponding frequency domain signal is explained below.

[0095] 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 target 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 (8):

[0096]

[0097] Where y(·) is the frequency domain signal generated by DFT transform precoding; 1 is the index of OFDM symbol, which ranges from Incremental in sequence; k is the RE position index on the first OFDM symbol, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; Replace the signal block with the waveform corresponding to the lth OFDM symbol.

[0098] 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):

[0099] 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.

[0100] (3) Signal-level LS optimization solution

[0101] 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 (9), as follows:

[0102]

[0103] Where y(·) is the frequency domain signal generated by LS optimization; 1 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 1, 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; The signal block is replaced by the waveform corresponding to the OFDM symbol indexed as l.

[0104] In an exemplary embodiment of the present application, similar to the DFT transform precoding scheme, according to formula (9), only a unique set of (1, 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 1, and the 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):

[0105] 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 (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 the 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 the PDSCH.

[0106] 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 target 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.

[0107] In an exemplary embodiment of the present application, after acquiring a frequency domain signal corresponding to a target waveform, a target transmission signal may be generated based on the frequency domain signal, where the target transmission signal is a signal including an LP-WUS signal sent to a UE.

[0108] 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.

[0109] 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 3The receiving end processing flow is the same as that shown in , and the embodiments of the present application will not be repeated here.

[0110] 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 part of the waveform in each period of the OOK waveform to be approximated is replaced by a constant modulus sequence 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, most of the energy will not be lost even if it passes through a deep fading area, and the target signal has a 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, 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.

[0111] 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.

[0112] Furthermore, although the steps of the method in the present disclosure are described 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 the steps shown must be performed to achieve the desired results.

[0113] 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.

[0114] Based on the same inventive concept, the present disclosure also provides a signal generating device in the following embodiments. 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.

[0115] Figure 7 A schematic diagram of a signal generating device in an embodiment of the present disclosure is shown. Figure 7 As shown, the signal generating device 700 includes:

[0116] The waveform processing module 702 generates an OOK waveform to be approximated based on the low-power wake-up LP-WUS signal, and replaces part of the waveform of each period in the OOK waveform to be approximated with 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.

[0117] In some embodiments, the signal generating device further comprises an optimization module.

[0118] 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.

[0119] In some embodiments, the waveform processing module 702 is used 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.

[0120] In some embodiments, the waveform processing module 702 is used to replace a portion of the waveform of each period in 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:

[0121] 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.

[0122] In some embodiments, the constant modulus sequence includes one or more of the following sequences:

[0123] ZC sequence, random orthogonal amplitude modulation sequence, CGS sequence, low PAPR sequence.

[0124] In some embodiments, the waveform processing module 702 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; performing time domain expansion and OOK modulation on each signal block to obtain an OOK waveform to be approximated corresponding to each signal block.

[0125] In some embodiments, the waveform processing module 702, 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, also includes: time-domain expansion of the signal block according to DFT transform precoding or least squares LS optimization corresponding to the number of sampling points, and OOK modulation of the extended signal block obtained by the time domain expansion to obtain the OOK waveform to be approximated.

[0126] In some embodiments, the signal block is time-domain extended according to the number of sampling points corresponding to DFT transform precoding or least squares LS optimization, including:

[0127] When the target waveform is subjected to DFT variation precoding, the signal blocks corresponding to each OFDM symbol are time-domain expanded according to the number of sampling points corresponding to the bandwidth size of the LP-WUS signal, and the parts of the OFDM symbol not covered by the extended signal are filled with zeros;

[0128] When the target waveform is LS optimized, 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 extended signal is filled with zeros.

[0129] 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:

[0130] 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:

[0131]

[0132] 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 1, and its value ranges from Increasing in sequence; The number of sampling points corresponding to DFT transform precoding; Replace the signal block with the waveform corresponding to the first OFDM symbol.

[0133] In some embodiments, performing LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform includes:

[0134] 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:

[0135]

[0136] 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; Replace the signal block with the waveform corresponding to the first OFDM symbol.

[0137] In some embodiments, performing LS optimization on the target waveform to obtain a frequency domain signal corresponding to the target waveform includes:

[0138] 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 satisfies the relationship between the target waveform, the interception matrix, the inverse Fourier transform matrix, and the phase transformation factor:

[0139]

[0140] 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 ; is the phase change factor, kc is the starting position of the frequency domain mapping, which can be at 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.

[0141] In some embodiments, generating a target transmission signal based on the frequency domain signal includes:

[0142] Mapping the frequency domain signal corresponding to the RE on each OFDM symbol to the RE in the OFDM modulator;

[0143] 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.

[0144] 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 through 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.

[0145] The concepts of “first”, “second”, etc. mentioned in the present 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.

[0146] 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.

[0147] 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.

[0148] In fact, according to the embodiments 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.

[0149] 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 can 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.

[0150] Refer to the following Figure 8 To describe the electronic device provided by the embodiment of the present disclosure. Figure 8 The electronic device 800 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0151] Figure 8 FIG. 8 is a schematic diagram showing the architecture of an electronic device 800 provided by an embodiment of the present invention. Figure 8 As shown, the electronic device 800 includes but is not limited to: at least one processor 810 and at least one memory 820.

[0152] The memory 820 is used to store instructions.

[0153] In some embodiments, the memory 820 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 8201 and / or a cache memory unit 8202 , and may further include a read-only memory unit (ROM) 8203 .

[0154] In some embodiments, the memory 820 may also include a program / utility 8204 having a set (at least one) of program modules 8205, such program modules 8205 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.

[0155] In some embodiments, the memory 820 may store an operating system, which may be a real-time operating system (RTX), LINUX, UNIX, WINDOWS, or OS X.

[0156] In some embodiments, data may also be stored in the memory 820 .

[0157] As an example, the processor 810 may read data stored in the memory 820 , where 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.

[0158] The processor 810 is used to call the instructions stored in the memory 820 to implement the steps of various exemplary embodiments of the present disclosure described in the above “Exemplary Method” section of this specification. For example, the processor 810 can execute each step of the above method embodiment.

[0159] It should be noted that the processor 810 may be a general-purpose processor or a special-purpose processor. The processor 810 may include one or more processing cores, and the processor 810 executes various functional applications and data processing by running instructions.

[0160] In some embodiments, the processor 810 may include a central processing unit (CPU) and / or a baseband processor.

[0161] In some embodiments, the processor 810 may determine an instruction based on the priority identification and / or function category information carried in each control instruction.

[0162] In the present disclosure, the processor 810 and the memory 820 may be provided separately or integrated together.

[0163] As an example, the processor 810 and the memory 820 may be integrated on a single board or a system on chip (SOC).

[0164] like Figure 8 As shown, the electronic device 800 is in the form of a general-purpose computing device. The electronic device 800 may further include a bus 830 .

[0165] Bus 830 may be a bus representing 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.

[0166] The electronic device 800 may also communicate with one or more external devices 840 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable a user to interact with the electronic device 800, and / or any device that enables the electronic device 800 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed through an input / output (I / O) interface 850.

[0167] Furthermore, the electronic device 800 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 860 .

[0168] like Figure 8 As shown, the network adapter 860 communicates with other modules of the electronic device 800 via the bus 830 .

[0169] It should be understood that although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0170] It is understood that the structure shown in the embodiment of the present disclosure does not constitute a specific limitation on the electronic device 800. In other embodiments of the present disclosure, the electronic device 800 may include: Figure 8 More or fewer components may be shown, or some components may be combined or separated, or the components may be arranged differently. Figure 8 The components shown may be implemented in hardware, software or a combination of software and hardware.

[0171] The present disclosure also provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, the signal generating method described in the above method embodiment is implemented.

[0172] 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.

[0173] As one example, computer readable storage media are non-volatile storage media.

[0174] 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.

[0175] In the embodiments of the present disclosure, the computer-readable storage medium may include a data signal propagated in a baseband or as a part of a carrier wave, in which computer instructions (readable program codes) are carried.

[0176] Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing.

[0177] 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.

[0178] The embodiment of the present disclosure further provides a computer program product, which stores instructions. When the instructions are executed by a computer, the computer implements the signal generating method described in the above method embodiment.

[0179] 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.

[0180] Programming languages ​​include object-oriented programming languages ​​such as Java, C++, etc., and also include conventional procedural programming languages ​​such as "C" language or similar programming languages.

[0181] 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.

[0182] 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).

[0183] The embodiment of the present disclosure also provides a chip, including at least one processor and an interface;

[0184] An interface for providing program instructions or data to at least one processor;

[0185] At least one processor is used to execute program instructions to implement the signal generating method described in the above method embodiment.

[0186] In some embodiments, the chip may further include a memory, which is used to store program instructions and data, and the memory is located inside or outside the processor.

[0187] 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 a combination of hardware and software implementations, which may be collectively referred to herein as "circuits", "modules" or "systems".

[0188] 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.

[0189] The present disclosure is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not disclosed in the present disclosure. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A signal generation method, characterized in that: include: Based on the low-power wake-up LP-WUS signal, an OOK waveform of the binary keying signal 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.

2. The method according to claim 1, characterized in that Based on the preset replacement rule, a constant modulus sequence is used to replace part of the waveform in each cycle of the OOK waveform to be approximated to obtain the target waveform, 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.

3. The method according to claim 1 or 2, characterized in that: The constant modulus sequence is used to replace part of the waveform in each cycle of the OOK waveform to be approximated to obtain the target waveform, 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.

4. 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.

5. 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.

6. The method according to claim 5, characterized in that Before replacing 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, 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.

7. The method according to claim 6, 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.

8. The method according to claim 5, 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.

9. The method according to claim 8, characterized in that The performing DFT transform 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; Replace the signal block with the waveform corresponding to the lth OFDM symbol.

10. The method according to claim 8, 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; Replace the signal block with the waveform corresponding to the lth OFDM symbol.

11. The method according to claim 8, 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.

12. The method according to any one of claims 9 to 11, 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.

13. The method according to claim 8, 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.

14. A signal generating device, characterized in that: include: The waveform processing module generates an OOK waveform to be approximated based on the low-power wake-up LP-WUS signal, and replaces part of the waveform of each period in the OOK waveform to be approximated with 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.

15. The signal generating device according to claim 14, characterized in that: The signal generating device further comprises: 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.

16. 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; Based on the low-power wake-up LP-WUS signal, an OOK waveform of a binary keying signal 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, 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.

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