Signal generation method, apparatus, and communication system

Abstract

The present disclosure provides a signal generation method, device and communication system, relating to the technical field of wireless communication and terminal. The method comprises: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal, replacing part of the waveform of each period in the first OOK waveform with a constant modulus sequence to obtain a target waveform, the constant modulus sequence being a group of sequences with the same modulus but different phases. According to the embodiment of the present disclosure, the first OOK waveform generated based on the LP-WUS signal can be scattered, the frequency diversity gain of the LP-WUS signal is improved, a similar spread spectrum effect is formed, 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, and further improve the synchronization of NR reception and reduce energy loss.

Description

Technical Field

[0001] This disclosure relates to the fields of wireless communication and terminal technology, and in particular to a signal generation method, apparatus and communication system. Background Technology

[0002] In the field of wireless communication, in new radio (NR) systems, when there is no data service, the terminal can enter a sleep state, such as idle or inactive, to reduce the power consumption of the terminal and save energy. When there is data service, the base station can wake up the terminal through a 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, so as to complete the transmission and reception of data services.

[0003] Currently, traditional NR reception is based on OFDM (Orthogonal Frequency Division Multiplexing) receivers, which demodulate LP-WUS signals using an accurate crystal oscillator or OFDM demodulator. However, the signal processing of OFDM receivers, crystal oscillators, and OFDM demodulators is complex and consumes a lot of power. Furthermore, when the waveform carrying the LP-WUS signal has too many in-phase signals in the time domain, it can cause spikes in the frequency domain. If the channel has strong frequency selectivity, once the spike falls into the deep decay region, the entire signal loses a lot of energy, making it difficult to distinguish the LP-WUS signal, thus reducing the detection accuracy and efficiency of the LP-WUS signal.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] This disclosure provides a signal generation method, apparatus, and communication system, which at least to some extent overcomes the problems of insufficient detection accuracy and low detection efficiency of LP-WUS signals caused by the difficulty in distinguishing LP-WUS signals in certain situations in related technologies.

[0006] According to a first aspect of this disclosure, a signal generation method is provided, comprising:

[0007] Based on the low-power wake-up LP-WUS signal, a first binary keying signal OOK waveform is generated. A portion of the waveform in each cycle of the first OOK waveform is replaced 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.

[0008] According to a second aspect of this disclosure, a signal generating apparatus is provided, comprising:

[0009] The waveform processing module generates a first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal. It then replaces a portion of the waveform in each cycle of the first OOK waveform 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 this disclosure, a communication system is provided, comprising:

[0011] The base station is used to generate a low-frequency wake-up LP-WUS signal and generate the first binary keying signal OOK waveform based on the LP-WUS signal.

[0012] Based on the low-power wake-up LP-WUS signal, a first binary keying signal OOK waveform is generated. A portion of the waveform in each cycle of the first OOK waveform 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.

[0013] The target waveform is precoded by DFT transformation or optimized by least squares (LS) to obtain the frequency domain signal corresponding to the target waveform, and the target transmission signal is generated 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 transmitted 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 this disclosure, an electronic device is provided, comprising: a memory for storing instructions; and a processor for calling the instructions stored in the memory to implement the signal generation method described above.

[0016] According to a fifth aspect of this disclosure, a computer-readable storage medium is provided that stores computer instructions thereon, which, when executed by a processor, implement the signal generation method described above.

[0017] According to a sixth aspect of this disclosure, a computer program product is provided, the computer program product storing instructions that, when executed by a computer, cause the computer to perform the signal generation method described above.

[0018] According to a seventh aspect of this disclosure, a chip is provided, including at least one processor and an interface;

[0019] An interface is used to provide program instructions or data to at least one processor;

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

[0021] The signal generation method, apparatus, and communication system provided in this disclosure, after acquiring a low-power wake-up LP-WUS signal, generate a first binary keying signal OOK waveform based on the LP-WUS signal, and then replace a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence to obtain the target waveform. The signal generation method of this application, by replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence, can disperse the first OOK waveform generated based on the LP-WUS signal, improve the frequency diversity gain of the LP-WUS signal, and form a spread spectrum-like effect. This allows the signal to maintain good performance even when passing through a frequency-selective fading channel (e.g., TDL-C), thereby improving the detection accuracy and efficiency of the LP-WUS signal, and ultimately improving the synchronization of NR reception and reducing power consumption loss.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0024] Obviously, the accompanying drawings described below are merely some embodiments of this disclosure. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0025] Figure 1 The schematic diagram illustrates the system architecture of a communication system that applies the signal generation method in an embodiment of this application.

[0026] Figure 2 The schematic diagram illustrates a flowchart of the signal generation method in an embodiment of this application.

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

[0028] Figure 4 The schematic diagram illustrates the signal interface after replacing the constant modulus sequence corresponding to each period with the same preset substitution rule in the embodiments of this disclosure.

[0029] Figure 5 The diagram illustrates the signal interface after the preset substitution rule in the embodiments of this disclosure is used to replace the different constant modulus sequences corresponding to each period.

[0030] Figure 6 The diagram illustrates the signal interface after a preset substitution rule in an embodiment of this disclosure is used, where some cycles in a series of cycles have the same constant modulus sequence, and these sequences are replaced.

[0031] Figure 7 The schematic diagram illustrates the structure of the signal generation device in an embodiment of this disclosure.

[0032] Figure 8 A structural block diagram of an electronic device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0033] The exemplary implementation will now be described more fully with reference to the accompanying drawings.

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

[0035] In the relevant technologies in this field, Release 18 proposed a new topic on power consumption optimization of terminal devices—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 generating a large transmission delay. It is very beneficial for the future deployment of UEs in vertical industries that do not have a sustainable power source, such as sensors and alarms.

[0036] To reduce UE power consumption, the UE includes a main radio module (MR) and a separate wake-up signal receiver. The MR functions similarly to a traditional NR UE, transmitting and receiving signals, and is mostly off or in deep sleep mode, consuming relatively high power, typically in the milliwatt (mW) range. The wake-up signal receiver, on the other hand, 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 perform basic UE functions, including radio resource management (RRM) measurements, paging, cell reselection and handover, and various application (app) layer functions.

[0037] Traditional NR reception is based on OFDM receivers. Demodulation requires an accurate crystal oscillator or OFDM demodulator, resulting in complex signal processing and high power consumption. To reduce power consumption, simpler modulation signals and receivers can be designed. Therefore, the LP-WUS signal transmitted 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). OOK is more widely used. Compared to FSK, OOK can utilize only a limited number of simple devices for envelope detection and does not require a crystal oscillator. Therefore, multi-carrier OOK technology is often used to modulate the LP-WUS signal to generate the NR signal, allowing for better coexistence with other NR signals.

[0038] There are four OOK schemes: OOK-Option 1, OOK-Option 2, OOK-Option 3, and OOK-Option 4. Among them, OOK-Option 4 is a predistortion method that approximates the target waveform by pre-generating the waveform and then using an operation similar to Discrete Fourier Transform (DFT). It has the dual advantages of speed and performance. Since OOK-Option 4 is an approximation method, the time-domain waveform can be arbitrarily set by setting the corresponding number of signals to carry on each OFDM symbol, so as to achieve high-speed and high-performance signal transmission.

[0039] 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 needed to generate the same "ON" input. Too many in-phase signals in the time domain lead to spikes in the frequency domain, and the frequency energy is too concentrated in the first half of the spectrum. When encountering common 3GPP fast-fading channel scenarios, such as TDL-C 300ns, most of the signal is lost, resulting in complete waveform distortion at the receiver. Since the receiver uses envelope detection, this means that regardless of the signal-to-noise ratio, the decision radiator cannot distinguish between high and low level waveforms, leading to low detection accuracy and efficiency for LP-WUS signals. Simultaneously, the latter half of the spectrum has too little frequency energy, contributing very little to the overall signal and resulting in very low spectral efficiency.

[0040] Before providing a detailed description of the technical solutions in the embodiments of this disclosure, the technical terms that may be involved in the embodiments of this disclosure will be explained and described first.

[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 keying (2ASK), is a unipolar non-return-to-zero code sequence used to control the opening and closing of a sinusoidal carrier.

[0043] (3) OOK-Option 4: A scheme for OOK modulation of LP-WUS signals. It is a pre-distortion method that approximates the target waveform by pre-generating the waveform and then optimizing it by discrete Fourier transform or least squares method.

[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 variation law of the signal.

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

[0046] (6) IFFT Transform: Inverse Fast Fourier Transform.

[0047] After introducing the technical terms that may be involved in the embodiments of this disclosure, the signal generation method in this disclosure will be described in detail.

[0048] Figure 1 A schematic diagram of the system architecture of a communication system applying the technical solution of this disclosure is 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. The base station 101 is used to generate a low-frequency wake-up LP-WUS signal and generate a first binary keying signal OOK waveform based on the LP-WUS signal. Based on the low-power wake-up LP-WUS signal, the first binary keying signal OOK waveform is generated. A constant modulus sequence is used to replace a portion of the waveform in each period of the first OOK waveform to obtain a target waveform. The constant modulus sequence is a set of sequences with the same modulus value but different phases. The target waveform is precoded by DFT transformation or optimized by least squares LS method 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 attenuation channel, demodulate and envelope detect the received target transmission signal to obtain the LP-WUS signal, and send the LP-WUS signal to the main radio module in the NR terminal 102 to wake up the main radio module. The network is a communication network used to provide a data transmission link between the base station 101 and the NR terminal 102.

[0050] The technical solutions provided in this disclosure can be applied to base stations, where LP-WUS signals are generated and processed by modulation, waveform replacement, time-frequency conversion, and frequency domain repetition mapping.

[0051] The signal generation method of this 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 in this disclosure will be described in detail below with reference to specific embodiments.

[0052] Figure 2 A flowchart of a signal generation method is shown, which is applied to a base station, which can be... Figure 1 Base station 101 in the middle, such as Figure 2 As shown, the signal generation method includes step S210.

[0053] In S210, a first binary keying signal OOK waveform is generated based on the low-power wake-up LP-WUS signal. A constant modulus sequence is used to replace a portion of the waveform in each cycle of the first OOK waveform to obtain the 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 this application, after acquiring the low-power wake-up LP-WUS signal, generates a first binary keying signal OOK waveform based on the LP-WUS signal. Then, it replaces a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence to obtain the target waveform. By replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence, the signal generation method of this application can disperse the first OOK waveform generated based on the LP-WUS signal, improve the frequency diversity gain of the LP-WUS signal, and form a spread-spectrum-like effect. This allows the signal to maintain good performance when passing through a frequency-selective fading channel (such as TDL-C), thereby improving the detection accuracy and efficiency of the LP-WUS signal, and ultimately improving the synchronization of NR reception and reducing power loss.

[0055] In the field of 5G and 5G+ mobile communication, signals are usually transmitted in the form of multi-carrier waveforms. Multi-carrier waveforms are usually implemented based on orthogonal frequency division multiplexing (OFDM) technology. OFDM is a type of multi-carrier modulation that achieves 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, we will first briefly describe the orthogonal frequency division multiplexing (OFDM) technology.

[0056] Figure 3 The schematic diagram illustrates the principle of OFDM baseband signal processing, such as... Figure 3As shown, the signal processing flow is divided into the transmitter (base station) signal processing flow and the receiver (UE) signal processing flow: At the transmitter, the bit stream is first modulated using QAM or QPSK, then sequentially converted from serial to parallel and then to serial data using IFFT. A guard interval (also known as a "cyclic prefix") is added to form OFDM symbols. During framing, a synchronization sequence and a channel estimation sequence are added so that the receiver can perform burst detection, synchronization, and channel estimation, and finally output orthogonal baseband signals. At the receiver, when a signal is detected, synchronization and channel estimation are performed first. After time synchronization, fractional frequency offset estimation and correction are completed, an FFT transformation is performed to estimate and correct integer frequency offset. The data obtained at this point is the modulated QAM or QPSK data. Finally, the data is demodulated to obtain the bit stream.

[0057] In the exemplary embodiments of this application, the essence of serial-to-parallel conversion of the LP-WUS signal is to divide the LP-WUS signal into multiple signal blocks. Specifically, the division can be based on the number of bits carried by each OFDM symbol. After the serial-to-parallel conversion is completed, each signal block can be time-domain extended, and OOK modulation can be performed according to the OOK-Option 4 scheme to generate a first OOK waveform. Then, the first OOK waveform is processed. Based on a preset substitution rule, a constant modulus sequence is used to replace a portion of the waveform in each period of the first OOK waveform to obtain the target waveform. Finally, the target waveform is time-frequency transformed to obtain the corresponding frequency domain signal, and the frequency domain signal is mapped to the RE corresponding to each OFDM symbol. This is... Figure 3 The modulation mapping process is shown below. Considering that at the transmitting end, when using the OOK-Option 4 scheme to modulate the bitstream with OOK, many consecutive sampling points are needed to generate the same "ON" input to produce a perfect "ON" waveform in the time domain. However, too many in-phase signals in the time domain can cause spikes in the frequency domain. When encountering a channel with strong frequency selectivity, once the spikes fall into the deep fading region, the entire signal loses a lot of energy, making it difficult to distinguish using envelope detection. Therefore, in the modulation mapping process, waveform replacement processing is performed on the first OOK waveform, replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain the target waveform. This ensures that the final generated frequency domain signal is dispersed rather than concentrated, thereby guaranteeing that the signal finally transmitted to the receiving end has high frequency diversity gain and can still maintain good performance when passing through a frequency-selective fading channel, ensuring the detection of the LP-WUS signal. The aforementioned first OOK waveform can also be called the OOK waveform to be approximated.

[0058] In an exemplary embodiment of this application, when generating multiple signal blocks by serial-to-parallel conversion of the LP-WUS signal, 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 bitstream corresponding to the LP-WUS signal is... It contains M bits. bit Each OFDM symbol can carry the following number of bits: Therefore, it can be generated through rate matching. One signal block, namely , ...each signal block is processed in parallel during the modulation mapping process. Since the processing flow for each signal block is the same, this embodiment only describes the processing flow for one signal block.

[0059] In an exemplary embodiment of this application, after acquiring the signal block, time-domain expansion and OOK modulation can be performed on the signal block to generate a first OOK waveform. When performing time-domain expansion on the signal block, the expansion can be based on the number of sampling points corresponding to the method for time-frequency conversion of the target waveform after waveform replacement processing. In the embodiments of this application, after processing the first OOK waveform, based on a preset substitution rule, a constant modulus sequence is used to replace a portion of the waveform in each period of the first OOK waveform to obtain the target waveform. Then, DFT transform precoding or LS optimization is used to process the target waveform. Therefore, the signal block can be time-domain expanded based on the number of DFT sampling points and the number of LS-optimized sampling points. When using DFT sampling points for expansion, the number of sampling points can be set to the bandwidth of the LP-WUS signal. This avoids truncating the frequency domain signal according to the LP-WUS signal bandwidth after completing the DFT transform precoding. When the LP-WUS signal bandwidth is less than the maximum number of bits corresponding to the OFDM symbol, the part of the OFDM symbol not covered by the expanded signal is filled with zeros. When using LS-optimized sampling points for expansion, the number of sampling points can be set to any value between the LP-WUS signal bandwidth and the maximum number of bits of the OFDM symbol. For example, FFT sampling points can be used to expand and fill the signal bits in the OFDM symbol. Alternatively, other sampling point numbers can be selected to expand the signal block in the time domain. When the signal bits in the OFDM symbol are not filled, the part of the OFDM symbol not covered by the expanded signal is still filled with zeros.

[0060] In an exemplary embodiment of this application, when a signal block is time-domain spread, each bit in the signal block is spread by the same factor; 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 this embodiment of the application, the expanded signal block is marked as... To make it easier to understand, let's take an example. When an OFDM symbol is assigned a signal block of 1101, and we want to extend the signal block to the LP-WUS signal bandwidth of 72, then each bit needs to be extended to 18 bits. That is to say, the extended signal block is composed of 18 ones, 18 ones, 18 zeros, and 18 ones in sequence.

[0061] After obtaining the extended signal block, the OOK-Option 4 scheme can be used to modulate the extended signal block to generate the first OOK waveform corresponding to the extended signal block. It is worth noting that since one signal block corresponds to one OFDM symbol, the first OOK waveform corresponding to the signal block also corresponds to one OFDM symbol.

[0062] In an exemplary embodiment of this application, the target waveform can be obtained by processing the first OOK waveform and replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence based on a preset substitution rule, thereby improving the frequency diversity gain of the LP-WUS signal. Specifically, the target waveform can be obtained by replacing the high-level ON waveform of the first OOK waveform with a constant modulus sequence based on a preset substitution rule.

[0063] In some embodiments, replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain the target waveform can be based on a preset substitution rule, replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain the target waveform.

[0064] The preset substitution rules include: the constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, and some periods in multiple periods have the same constant modulus sequence.

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

[0066] In some embodiments, a target waveform is obtained by replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence. This can be achieved by replacing the high-level ON waveform of the first OOK waveform with a constant modulus sequence. Accordingly, the preset replacement rules include 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 some ON waveforms among multiple ON waveforms have the same constant modulus sequence.

[0067] Figure 4 The diagram illustrates the signal interface after substitution, where the constant modulus sequence corresponding to each cycle is the same according to the preset substitution rule. Figure 4 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, and the high-potential waveform occupies 4 bits. The high-potential waveform is replaced by the constant-mode sequence 1.

[0068] Figure 5 The diagram illustrates the signal interface after substitution, where the constant modulus sequence corresponding to each cycle is different according to the preset substitution rule. Figure 5 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}. The high-potential waveform occupies 4 bits. The high-potential waveform is replaced with different constant-mode sequences, that is, constant-mode sequence 1 and constant-mode sequence 2 are used to replace it.

[0069] Figure 6 The diagram illustrates the signal interface after substitution when a set of constant mode sequences corresponding to some periods in multiple periods are identical. 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-mode sequences 1 and two constant-mode sequences 2.

[0070] In an exemplary embodiment of this application, after obtaining the target waveform, the target waveform can be precoded by DFT transformation or optimized by least squares (LS) to obtain a frequency domain signal corresponding to the target waveform. Furthermore, a target transmission signal can be generated based on the frequency domain signal and sent to the UE.

[0071] In the exemplary embodiments of this application, similar to processing the first OOK waveform by replacing a portion of the waveform in each period of the first OOK waveform 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 art, it will not be described in detail in this embodiment. Instead, only matrix-level LS optimization schemes, signal-level DFT transform precoding schemes, and signal-level LS optimization schemes will be described in detail below.

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

[0073] Before describing the LS optimization scheme in the embodiments of this application, we will first briefly describe the existing OOK waveform generation method based on LS optimization.

[0074] OOK waveform generation based on LS optimization is divided into a basic generation method based on non-shifting and an extended generation method based on shifting. The LS-optimized approximation expression for the basic generation method based on non-shifting is shown in equation (1):

[0075] (1)

[0076] Where, x LS For the frequency domain signal optimized by LS; F inv This is the inverse Fourier transform matrix.

[0077] F inv= , G is the cutoff matrix.

[0078] G= b n For extended signal blocks.

[0079] Expanding the LS-optimized approximation, we obtain the expression shown in (2):

[0080] (2)

[0081] Expression (2) is a very typical FFT transform. The elements in each matrix are constructed using different FFT orthogonal bases, thus yielding the final DFT transform result. Meanwhile, the truncation matrix G is composed of an L-length square matrix and all zeros, aiming to extract elements of the target bandwidth length L, while the remaining zeros in the result are discarded during the mapping. Since the bandwidth is only L long, corresponding to the number of elements in the final column vector, it is equivalent to... n The FFT transform at n points is shortened to length L by this LS optimization.

[0082] Based on the shiftable extended generation method, LS optimization mapping at different frequency domain positions is achieved by using a phase transformation factor. The LS optimization approximation expression corresponding to the shiftable extended generation method is shown in formula (3):

[0083] (3)

[0084] Where, x LS For the frequency domain signal optimized by LS; F inv G is the inverse Fourier transform matrix; G is the truncation matrix; b n For extended signal blocks; s w This is the phase adjustment matrix for the current bit based on its mapping position. k c This is the starting position for the frequency domain mapping.

[0085] The starting position of the frequency domain mapping is also the starting RE of the frequency domain mapping. This starting RE can be any RE on any RB, for example, when k c When =0, the starting position of the frequency domain mapping is the 0th bit RE on RB. When k c When k = 3, then the starting position of the frequency domain mapping is the 3rd bit RE on RB, and so on. c When = 0, the calculation result in expression (2) can be obtained according to formula (3), as shown in expression (4):

[0086]

[0087] = (4)

[0088] According to formula (3), by changing k c Since the phase can be shifted, a suitable generating phase can be selected for the Fourier transform matrix to cancel the pre-distorted truth position, so that the result still becomes the FFT effect based on LS optimization, as shown in expression (5):

[0089] (5)

[0090] For the shiftable extended generation method described above, although a good approximation effect can be obtained, the spectral energy is too concentrated. When passing through a channel with strong frequency selectivity, once the spike falls into the deep decay region, most of the energy will be lost, causing the waveform at the receiving end to be completely distorted. In view of this, before obtaining the frequency domain signal using formula (3), a constant modulus sequence can be used to replace part of the waveform in each period of the first OOK waveform to obtain the target waveform. Then, the corresponding frequency domain signal can be obtained based on formula (3). The expression of the frequency domain signal obtained by LS optimization is shown in formula (6):

[0091] (6)

[0092] Where, α μ This is the sequence used for waveform replacement processing, and it is the same as the sequence α described above. l (m i ) equivalent; b n To extend the signal sequence, and in conjunction with the extended signal block b described above. l (i) Equivalent, i.e., b n It is a sequence of extended signals corresponding to the same OFDM symbol.

[0093] Expanding equation (6), we can obtain the LS-optimized frequency domain signal as shown in equation (7):

[0094] (7)

[0095] The rightmost sequence represents the final generated frequency domain signal, where each signal is mapped to a different RE on the same OFDM symbol. Analysis of the signal expression reveals that each signal possesses 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-1)th bit signal is... Because the signals on different REs have different phase information, the spectral signals are relatively dispersed and the spectral energy is reduced, forming a spread spectrum-like effect, which improves the frequency diversity gain of the signal, and thus ensures that the signal still has good performance when passing through the frequency selective fading channel.

[0096] (2) Signal-level DFT transform precoding scheme

[0097] The matrix-level LS optimization scheme is a scheme that processes the extended signal block corresponding to the OFDM symbol. Considering that the essence of processing the extended signal block corresponding to the OFDM symbol is to process each signal in the extended signal block, in order to clearly understand the technical solution of this application, the method of how to perform signal-level processing on the target waveform to obtain the corresponding frequency domain signal in the embodiments of this application will be explained next.

[0098] In an exemplary embodiment of this 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 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):

[0099] (8)

[0100] Where y(·) is the frequency domain signal generated by DFT transform precoding; l is the index of the OFDM symbol, with a value from 0 to ( ) Increment sequentially; k is the RE position index on the l-th OFDM symbol, with values ​​ranging from 0 to ( (Increase sequentially) The number of sampling points corresponding to the DFT transform precoding; Replace the waveform signal block corresponding to the l-th OFDM symbol.

[0101] In an exemplary embodiment of this application, according to formula (8), only one 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 k-th RE in the OFDM symbol with index l. For example, when l=1 and k=0, the expression for the frequency domain signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated according to formula (8): .

[0102] It is worth noting that the coefficients in formula (8) Its function is to correct deviations that exist in the frequency domain signal generation process, ensuring that the generated frequency domain signal is closer to the real signal.

[0103] (3) LS optimization scheme at the signal level

[0104] In an exemplary embodiment of this application, when using the LS optimization scheme for time-frequency conversion of a signal, the number of sampling points is greater than or equal to the bandwidth. 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 this application, LS optimization can be performed according to formula (9), as follows:

[0105] (9)

[0106] Where y(·) is the frequency domain signal generated by LS optimization; l is the index of the OFDM symbol, taking values ​​from 0 to ( ) Increment sequentially; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from 0 to ( (Increase sequentially) Optimize the number of sampling points for LS; β represents 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 OFDM symbol with index 1.

[0107] In an exemplary embodiment of this 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 k-th 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, according to formula (9), the expression for the frequency domain signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated as follows: .

[0108] It is worth noting that the power control factor β in formula (9) is used to ensure the signal-to-noise ratio (SNR).

[0109] The average value of the noise ratio (SNR or S / N) is the same as the signal-to-noise ratio in the Physical Downlink Shared Channel (PDSCH). Furthermore, it can also be used to ensure that the average value of the signal-to-interference ratio (SIR) is the same as the signal-to-interference ratio in the PDSCH, and the average value of the signal-to-interference and noise ratio (SINR) is the same as the signal-to-interference and noise ratio in the PDSCH.

[0110] The above embodiments described a matrix-level LS optimization scheme, a signal-level DFT transform precoding scheme, and a signal-level LS optimization scheme. These optimization schemes all share the same goal: 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 a higher number of time-domain points results in better approximation, the LS optimization scheme approximates the original first OOK waveform better than the DFT transform precoding scheme, thus offering superior performance.

[0111] In an exemplary embodiment of this application, after obtaining the frequency domain signal corresponding to the target waveform, a target transmission signal can be generated based on the frequency domain signal. The target transmission signal is the signal containing the LP-WUS signal that is transmitted to the UE.

[0112] In generating the target transmission signal based on the frequency domain signal, the frequency domain signal corresponding to the REs on each OFDM symbol, generated by the DFT transform precoding scheme or the LS optimization scheme, can be input to the OFDM modulator and mapped onto the REs in the OFDM modulator. Then, the OFDM modulator performs OFDM modulation on the received frequency domain signal to obtain a target OOK waveform that approximates the first OOK waveform. Furthermore, the target transmission signal can be constructed based on the target OOK waveform. Continuing with... Figure 3Taking the OFDM baseband signal processing schematic diagram as an example, after processing all signal blocks corresponding to the LP-WUS signal to generate the corresponding frequency domain signal according to the above embodiment, the frequency domain signal can be mapped to different REs in the OFDM modulator. Then, frequency domain-to-time domain conversion processing is performed on the frequency domain signals corresponding to different signal blocks. For example, the Inverse Fast Fourier Transform (IFFT) method can be used to perform frequency domain-to-time domain conversion processing to obtain the time domain signal corresponding to the input frequency domain signal. Then, parallel-to-serial conversion can be performed on the time domain signals corresponding to different signal blocks. The time domain signals corresponding to different signal blocks are spliced ​​in sequence to obtain the target OOK waveform. Finally, in order to ensure the signal transmission security, a guard interval can be added to the target OOK waveform, such as padding with zeros or adding a cyclic prefix in the guard interval to avoid inter-symbol interference. Thus, the target transmitted signal can be obtained.

[0113] In an exemplary embodiment of this application, after acquiring the target transmission signal, the target transmission signal can be transmitted to the UE through a multipath fading channel. Upon receiving the target transmission signal, the wake-up signal receiver in the UE can perform envelope detection on the target transmission signal to obtain the LP-WUS signal. The processing flow of the wake-up signal receiver for the target transmission signal is similar to... Figure 3 The receiving end processing flow shown is the same, and will not be repeated here in the embodiments of this application.

[0114] According to the signal generation method in this application embodiment, before performing DFT transform precoding or LS optimization on the first OOK waveform, a portion of the waveform in each cycle of the first OOK waveform is replaced with a constant modulus sequence to obtain the target waveform. This avoids frequency domain energy concentration, improves the frequency diversity gain of the LP-WUS signal, and ensures that when the target transmitted signal passes through a multipath fading channel or a channel with strong frequency selectivity, it will not lose most of its energy even if it passes through a deep fading region. This provides strong anti-fading capability and ensures the integrity of the LP-WUS signal received by the UE. When using envelope detection method for signal detection, it can clearly distinguish between high-level waveforms and low-level waveforms, thereby extracting the LP-WUS signal and improving the detection rate and accuracy of the LP-WUS signal.

[0115] Furthermore, the wake-up signal receiver can wake up the main radio module (MR) in the UE based on the demodulated LP-WUS signal, ensuring that the MR is synchronized with the base station signal, realizing the basic functions of the UE, and achieving the goal of saving energy consumption.

[0116] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result.

[0117] In some embodiments, certain steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be broken down into multiple steps for execution.

[0118] Based on the same inventive concept, this disclosure also provides a signal generation device, as shown in the following embodiment. Since the principle by which this device embodiment solves the problem is similar to that of the above-described method embodiment, the implementation of this device embodiment can refer to the implementation of the above-described method embodiment, and repeated details will not be described again.

[0119] Figure 7 This diagram illustrates a signal generation apparatus according to an embodiment of the present disclosure, such as... Figure 7 As shown, the signal generation device 700 includes:

[0120] The waveform processing module 702 generates a first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal. It then replaces a portion of the waveform in each cycle of the first OOK waveform 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.

[0121] In some embodiments, the signal generation apparatus further includes an optimization module.

[0122] The optimization module is used to perform DFT transform precoding or least squares LS optimization on the target waveform to obtain the frequency domain signal corresponding to the target waveform, and generate the target transmission signal based on the frequency domain signal.

[0123] In some embodiments, the waveform processing module 702 is used to replace the high-level ON waveform of the first OOK waveform with a constant modulus sequence based on a preset substitution rule in order to obtain a target waveform.

[0124] In some embodiments, the waveform processing module 702 is configured to replace a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence based on a preset substitution rule to obtain a target waveform, wherein the preset substitution rule includes:

[0125] The constant mode sequence is the same for each period, the constant mode sequence is different for each period, and the constant mode sequence is the same for some periods in multiple periods.

[0126] In some embodiments, the constant modulus sequence includes one or more of the following sequences:

[0127] ZC sequence, random quadrature amplitude modulation sequence, CGS sequence, low PAPR sequence.

[0128] In some embodiments, the waveform processing module 702 generates a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal, including: performing rate matching on the number of bits contained in the LP-WUS signal according to the number of bits that an orthogonal frequency division multiplexing (OFDM) symbol can carry, so as to divide the LP-WUS signal into multiple signal blocks; performing time-domain extension and OOK modulation on each signal block to obtain a first OOK waveform corresponding to each signal block.

[0129] In some embodiments, before replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain the target waveform, the waveform processing module 702 further includes: performing time-domain expansion on the signal block according to the number of sampling points corresponding to the DFT transform precoding or least squares LS optimization, and performing OOK modulation on the expanded signal block obtained by time-domain expansion to obtain the first OOK waveform.

[0130] In some embodiments, temporal extension of the signal block is performed based on the number of sampling points corresponding to DFT transform precoding or least squares LS optimization, including:

[0131] When performing DFT transformation precoding on the target waveform, the signal block corresponding to each OFDM symbol is extended in the time domain according to the number of sampling points corresponding to the bandwidth of the LP-WUS signal, and the part of the OFDM symbol not covered by the extended signal is filled with zeros.

[0132] When performing LS optimization on the target waveform, the signal block corresponding to each OFDM symbol is extended in the time domain according to the number of sampling points corresponding to LS optimization, and the part of the OFDM symbol not covered by the extended signal is filled with zeros.

[0133] 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:

[0134] The frequency domain signal and OFDM symbol index, the RE position index on the OFDM symbol, and the number of sampling points corresponding to the DFT transform precoding satisfy the following relationship:

[0135]

[0136] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, taking values ​​from 0 to ( ) Increment sequentially; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from 0 to ( (Increase sequentially) The number of sampling points corresponding to the DFT transform precoding; Replace the waveform signal block corresponding to the l-th OFDM symbol.

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

[0138] The frequency domain signal and OFDM symbol index, 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 LS optimization satisfy the following relationship:

[0139]

[0140] Where y(·) is the frequency domain signal; l is the index of the OFDM symbol, taking values ​​from 0 to ( ) Increment sequentially; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from 0 to ( (Increase sequentially) Optimize the number of sampling points for LS; β represents the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor. Replace the waveform signal block corresponding to the l-th OFDM symbol.

[0141] In some embodiments, LS optimization is performed on the target waveform to obtain a frequency domain signal corresponding to the target waveform, including:

[0142] LS optimization is performed on the target waveform based on the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor. The frequency domain signal satisfies the following relationship with the target waveform, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor:

[0143]

[0144] Among them, X LS X is a frequency domain signal sequence. LS Each element in the table represents a frequency domain signal mapped to a different resource particle (RE). , is the intercept matrix constructed based on the bandwidth of the LP-WUS signal; , is the inverse Fourier transform matrix. N is the number of sampling points; for The conjugate transpose of ; , where k is the phase change factor. c The starting position for frequency domain mapping can be any RE in any resource block RB; The target waveform; For sequence; This is the first OOK waveform.

[0145] In some embodiments, generating a target transmission signal based on a frequency domain signal includes:

[0146] Map the frequency domain signal corresponding to the RE on each OFDM symbol to the RE in the OFDM modulator;

[0147] The frequency domain signal is OFDM modulated by an OFDM modulator to obtain a target OOK waveform that approximates the first OOK waveform, and the target transmission signal is constructed based on the target OOK waveform.

[0148] In some embodiments, the system further includes transmitting the target transmission signal to a wake-up signal receiver in the user terminal (UE) via a multipath fading channel, performing envelope detection on the target transmission signal through the wake-up signal receiver to obtain the LP-WUS signal, and waking up the main radio module based on the LP-WUS signal.

[0149] The concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to define the order of functions performed by these devices, modules or units or their interdependencies.

[0150] Regarding the signal generation apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the signal generation method, and will not be elaborated upon here.

[0151] It should be noted that although several modules or units of the device used for action execution are mentioned in the detailed description above, this division is not mandatory.

[0152] In fact, according to embodiments of this 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 and embodied by multiple modules or units.

[0153] Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0154] The following reference Figure 8 This describes the electronic device provided in the embodiments of this disclosure. Figure 8 The electronic device 800 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments disclosed herein.

[0155] Figure 8This diagram illustrates the architecture of an electronic device 800 according to 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.

[0156] Memory 820 is used to store instructions.

[0157] In some embodiments, memory 820 may include a readable medium in the form of volatile memory cells, such as random access memory (RAM) 8201 and / or cache memory 8202, and may further include read-only memory (ROM) 8203.

[0158] In some embodiments, the memory 820 may also include a program / utility 8204 having a set (at least one) program module 8205, such program module 8205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0159] In some embodiments, memory 820 may store an operating system. This operating system may be a real-time operating system (RTX), such as Linux, UNIX, Windows, or OS X.

[0160] In some embodiments, the memory 820 may also store data.

[0161] As an example, processor 810 can read data stored in memory 820, which may be stored at the same memory address as the instruction, or the data may be stored at a different memory address than the instruction.

[0162] Processor 810 is configured to invoke instructions stored in memory 820 to implement the steps described in the "Exemplary Methods" section above, according to various exemplary embodiments of this disclosure. For example, processor 810 may execute the steps of the above method embodiments.

[0163] It should be noted that the processor 810 described above can 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.

[0164] In some embodiments, processor 810 may include a central processing unit (CPU) and / or a baseband processor.

[0165] In some embodiments, the processor 810 may determine an instruction based on the priority identifier and / or function category information carried in each control instruction.

[0166] In this disclosure, the processor 810 and the memory 820 can be configured separately or integrated together.

[0167] As an example, the processor 810 and memory 820 can be integrated on a single board or a system-on-a-chip (SOC).

[0168] like Figure 8 As shown, the electronic device 800 is presented in the form of a general-purpose computing device. The electronic device 800 may also include a bus 830.

[0169] Bus 830 can represent one or more of several types of bus structures, including a memory bus or memory controller, peripheral bus, graphics acceleration port, processor, or a local bus using any of the various bus structures.

[0170] Electronic device 800 can also communicate with one or more external devices 840 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 800, and / or with any device that enables electronic device 800 to communicate with one or more other computing devices (e.g., router, modem, etc.). Such communication can be performed through input / output (I / O) interface 850.

[0171] Furthermore, the electronic device 800 can also communicate with one or more networks (such as local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via the network adapter 860.

[0172] like Figure 8 As shown, the network adapter 860 communicates with other modules of the electronic device 800 via the bus 830.

[0173] It should be understood that, although not shown in the figure, other hardware and / or software modules may 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.

[0174] It is understood that the structures illustrated in the embodiments of this disclosure do not constitute a specific limitation on the electronic device 800. In other embodiments of this disclosure, the electronic device 800 may include... Figure 8 This may involve more or fewer components, or combining certain components, or splitting certain components, or different component arrangements. Figure 8The components shown can be implemented in hardware, software, or a combination of both.

[0175] This disclosure also provides a computer-readable storage medium storing computer instructions thereon, which, when executed by a processor, implement the signal generation method described in the above method embodiments.

[0176] In this embodiment of the disclosure, the computer-readable storage medium 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.

[0177] As an example, a computer-readable storage medium is a non-volatile storage medium.

[0178] In some embodiments, more specific examples of computer-readable storage media in this disclosure may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, USB flash drives, portable hard drives, or any suitable combination of the foregoing.

[0179] In this embodiment of the disclosure, the computer-readable storage medium may include data signals propagated in baseband or as part of a carrier wave, wherein computer instructions (readable program code) are carried.

[0180] The transmitted data signal can take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof.

[0181] In some examples, computational instructions contained on a computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0182] This disclosure also provides a computer program product that stores instructions that, when executed by a computer, cause the computer to implement the signal generation method described in the above method embodiments.

[0183] The aforementioned instructions can be program code. In practice, the program code can be written using any combination of one or more programming languages.

[0184] Programming languages ​​include object-oriented programming languages—such as Java and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages.

[0185] The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0186] In cases involving remote computing devices, the remote computing devices can be connected to user computing devices via any type of network, including local area networks (LANs) or wide area networks (WANs), or they can be connected to external computing devices (e.g., via the Internet using an Internet service provider).

[0187] This disclosure also provides a chip, including at least one processor and an interface;

[0188] An interface is used to provide program instructions or data to at least one processor;

[0189] At least one processor is used to execute program instructions to implement the signal generation method described in the above method embodiments.

[0190] In some embodiments, the chip may further include a memory for storing program instructions and data, the memory being located within or outside the processor.

[0191] Those skilled in the art will understand that all or part of the steps of the above embodiments can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which can be collectively referred to as "circuit", "module" or "system".

[0192] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein.

[0193] This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered exemplary only, and the true scope and spirit of this 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, the waveform of the first binary keying signal OOK is modulated, and a portion of the waveform of each cycle in the first OOK waveform 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. The step of replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain a target waveform includes: replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence based on a preset replacement rule to obtain a target waveform, wherein the preset replacement rule includes: the constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, or some periods in multiple periods have the same constant modulus sequence.

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

3. The method according to claim 1, characterized in that, The generation of the first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal includes: The LP-WUS signal is divided into one or more signal blocks according to the number of bits it can carry; Each of the signal blocks is subjected to time-domain extension and OOK modulation to obtain a first OOK waveform corresponding to each of the signal blocks.

4. The method according to claim 3, characterized in that, Before replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence to obtain the target waveform, the method further includes: The signal block is time-domain extended according to the bandwidth value corresponding to DFT precoding or least squares LS optimization, and the extended signal block obtained by time-domain extension is OOK modulated to obtain the first OOK waveform.

5. The method according to claim 4, characterized in that, The step of performing time-domain spreading on the signal block based on the bandwidth value corresponding to DFT precoding or least squares LS optimization includes: When performing DFT transformation precoding on the target waveform, the signal block corresponding to each OFDM symbol is extended in the time domain according to the bandwidth value corresponding to the bandwidth size of the LP-WUS signal, and the part of the OFDM symbol not covered by the extended signal is filled with zeros when filling is required. When performing LS optimization on the target waveform, the signal blocks corresponding to each OFDM symbol are extended in the time domain according to the bandwidth value corresponding to the LS optimization, and the parts of the OFDM symbol not covered by the extended signal are filled with zeros when filling is required.

6. The method according to claim 3, characterized in that, The method further includes: The target waveform is precoded using DFT or optimized using least squares (LS) to obtain a second signal corresponding to the target waveform, and a target transmission signal is generated based on the second signal.

7. The method according to claim 6, characterized in that, The step of performing DFT precoding on the target waveform to obtain a second signal corresponding to the target waveform includes: The second signal and the index of the OFDM symbol, the RE position index on the OFDM symbol, and the bandwidth value corresponding to the DFT precoding satisfy the following relationship: Where y(·) is the second signal; l is the index of the OFDM symbol, taking values ​​from 0 to ( ) Increasing sequentially, This indicates the number of bits contained in the bitstream corresponding to the LP-WUS signal. This indicates the number of bits that each OFDM symbol can carry; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from 0 to ( (Increase sequentially) The bandwidth value corresponding to the DFT precoding; Replace the waveform signal block corresponding to the l-th OFDM symbol.

8. The method according to claim 6, characterized in that, The step of performing LS optimization on the target waveform to obtain a second signal corresponding to the target waveform includes: The second 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 bandwidth value corresponding to the LS optimization satisfy the following relationship: Where y(·) is the second signal; l is the index of the OFDM symbol, taking values ​​from 0 to ( ) Increasing sequentially, This indicates the number of bits contained in the bitstream corresponding to the LP-WUS signal. This indicates the number of bits that each OFDM symbol can carry; k is the index of the RE position in the OFDM symbol with index l, and its value ranges from 0 to ( (Increase sequentially) Optimize the corresponding bandwidth value for the LS; β is the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor. Replace the waveform signal block corresponding to the l-th OFDM symbol.

9. The method according to claim 6, characterized in that, The step of performing LS optimization on the target waveform to obtain a second signal corresponding to the target waveform includes: The target waveform is optimized using the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor, wherein the second signal satisfies the following relationship with the target waveform, the truncation matrix, the inverse Fourier transform matrix, and the phase transformation factor: Among them, X LS The second signal sequence, X LS Each element in the equation represents a second signal mapped to a different resource particle (RE). , is the intercept matrix constructed based on the bandwidth of the LP-WUS signal; , is the inverse Fourier transform matrix. N is the bandwidth value; for The conjugate transpose of ; , where k is the phase transformation factor. c The starting position for frequency domain mapping can be any RE in any resource block RB; The target waveform; The sequence is described above; This is the first OOK waveform.

10. The method according to any one of claims 7-9, characterized in that, The step of generating the target transmission signal based on the second signal includes: Map the second signal corresponding to the RE on each OFDM symbol onto the RE; The second signal is OFDM modulated using an OFDM modulator to obtain the target OOK waveform.

11. The method according to claim 6, characterized in that, The method further includes: The target transmission signal is transmitted to the wake-up signal receiver in the user terminal (UE) through a multipath fading channel. The wake-up signal receiver performs envelope detection on the target transmission signal to obtain the LP-WUS signal, and wakes up the main radio module based on the LP-WUS signal.

12. A signal receiving method, characterized in that, Applied to a terminal, the method includes: Receive or listen to the LP-WUS signal; the LP-WUS signal is obtained by replacing a portion of the waveform of each cycle of the first binary keying signal OOK waveform with a constant modulus sequence, the constant modulus sequence being a set of sequences with the same modulus value but different phases; The replacement of a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence includes: replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence based on a preset replacement rule, wherein the preset replacement rule includes: the constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, or some periods in multiple periods have the same constant modulus sequence.

13. A signal generation device, characterized in that, include: The waveform processing module modulates the first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal, and replaces a portion of the waveform in each cycle of the first OOK waveform 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. The step of replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence to obtain a target waveform includes: replacing a portion of the waveform in each period of the first OOK waveform with a constant modulus sequence based on a preset replacement rule to obtain a target waveform, wherein the preset replacement rule includes: the constant modulus sequence corresponding to each period is the same, the constant modulus sequence corresponding to each period is different, or some periods in multiple periods have the same constant modulus sequence.

14. The signal generation apparatus according to claim 13, characterized in that, The signal generation device further includes: An optimization module is used to perform DFT precoding or least squares LS optimization on the target waveform to obtain a second signal corresponding to the target waveform, and to generate a target transmission signal based on the second signal.

15. A communication system, characterized in that, include: The base station is used to generate a low-frequency wake-up LP-WUS signal and generate a first binary keying signal OOK waveform based on the LP-WUS signal. Based on the low-power wake-up LP-WUS signal, the waveform of the first binary keying signal OOK is modulated, and a portion of the waveform in each cycle of the first OOK waveform is replaced 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. The replacement of a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence to obtain the target waveform includes: replacing a portion of the waveform in each cycle of the first OOK waveform with a constant modulus sequence based on a preset replacement rule to obtain the target waveform. The preset replacement rule includes: the constant modulus sequence corresponding to each cycle is the same, the constant modulus sequence corresponding to each cycle is different, or some cycles in multiple cycles have the same constant modulus sequence. The target waveform is precoded using DFT or optimized using least squares (LS) to obtain a second signal corresponding to the target waveform, and a target transmission signal is generated based on the second 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 transmitted signal to 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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