Signal generation method, apparatus, communication system

Abstract

The application belongs to the technical field of wireless communication and terminal, and relates to a signal generation method, device, communication, system storage medium and electronic equipment. The method comprises the following steps: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal; and performing phase rotation on the first OOK waveform by using a sequence containing multiple phase rotation factors with the same modulus and the phase changing in a preset rule, so as to obtain a phase-rotated OOK waveform. According to the application, the frequency diversity gain of the LP-WUS signal is improved by performing phase rotation on the time-domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has strong anti-fading capability, and the detection rate and detection accuracy of the LP-WUS signal are improved.

Description

Technical Field

[0001] This application relates to the fields of wireless communication and terminal technology, and in particular to a signal generation method, a signal generation device, and a 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 application. Summary of the Invention

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

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

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

[0008] According to a second aspect of this application, a signal generation apparatus is provided, comprising: a phase rotation module, configured to generate a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal, and to perform phase rotation on the first OOK waveform using a sequence of multiple phase rotation factors having the same magnitude and whose phases change according to a preset rule, to obtain a phase-rotated OOK waveform.

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

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

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

[0012] As can be seen from the above technical solutions, the signal generation method, signal generation apparatus, computer-readable storage medium, and electronic device in the exemplary embodiments of this application have at least the following advantages and positive effects:

[0013] The signal generation method in this embodiment acquires a low-power wake-up LP-WUS signal, generates a first binary keying signal OOK waveform based on the LP-WUS signal, and then uses a sequence of phase rotation factors containing multiple phase rotation factors with the same magnitude and phases varying according to a preset rule to perform phase rotation on the first OOK waveform to obtain a phase-rotated OOK waveform. This signal generation method can improve the detection accuracy and efficiency of the LP-WUS signal by performing phase rotation on the first OOK waveform generated based on the LP-WUS signal, thereby improving the synchronization of NR reception and reducing power consumption loss.

[0014] 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 application. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] 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.

[0017] Figure 2 The schematic diagram illustrates a flowchart of the signal generation method in an embodiment of this application.

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

[0019] Figure 4 The illustration shows a flowchart of determining the sequence for phase rotation based on a phase change pattern that varies at preset intervals, according to an embodiment of this application.

[0020] Figure 5 The illustration shows a flowchart of determining the sequence for phase rotation based on a phase change pattern that varies at preset intervals, according to an embodiment of this application.

[0021] Figure 6 The diagram illustrates the signal interface after phase rotation of the high-potential waveform in the first OOK waveform based on a sequence determined by a preset interval of 1 in an embodiment of this application.

[0022] Figure 7 The diagram illustrates the signal interface after phase rotation of the first OOK waveform based on a sequence determined by a preset interval of 1 in an embodiment of this application.

[0023] Figure 8 The diagram illustrates the signal interface after phase rotation of the high-potential waveform of the first OOK waveform based on a sequence determined by a preset interval of 5 in an embodiment of this application.

[0024] Figure 9 The diagram illustrates the signal interface after phase rotation of the high-potential waveform in the first OOK waveform based on a sequence determined by a preset interval 1 and a preset repetition 2 in an embodiment of this application.

[0025] Figure 10 The schematic diagram illustrates the structure of the signal generation device in an embodiment of this application.

[0026] Figure 11 A schematic diagram of a computer system architecture suitable for implementing the embodiments of this application is shown. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0028] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0029] The terms “a,” “an,” “the,” and “the” are used in this specification to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first” and “second” are used only as markings and are not a limitation on the number of objects.

[0030] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities 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.

[0031] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Currently, there are four mainstream 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, thereby achieving high-speed and high-performance signal transmission.

[0036] However, the main problem with the spectrum generated by OOK-Option 4 is that, in order to perfectly represent the "ON" waveform in the time domain, many consecutive sampling points are needed to generate the same "ON" input. Too many in-phase signals in the time domain will cause spikes in the frequency domain, and the frequency domain energy is too concentrated in the first half of the spectrum. Once it encounters the fast fading channel scenario common in 3GPP, such as TDL-C 300ns, most of the quantity will be lost, causing the waveform at the receiving end to be completely distorted. Since the receiving end uses envelope detection, this will cause the decision device to be unable to distinguish between high-level waveforms and low-level waveforms regardless of the signal-to-noise ratio, resulting in low detection accuracy and efficiency of LP-WUS signals.

[0037] To address the technical problems existing in related technologies, this application proposes a signal generation method. By performing phase rotation on the first OOK waveform corresponding to the LP-WUS signal generated based on the OOK-Option 4 scheme, the frequency diversity gain of the LP-WUS signal is improved. This ensures that the signal does not lose most of its energy when passing through the frequency selective fading channel and still has good performance. In 3GPP engineering application scenarios, it can wake up MR and achieve the design requirement of saving power.

[0038] Before providing a detailed description of the technical solutions in the embodiments of this application, the technical terms that may be involved in the embodiments of this application will be explained and described first.

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

[0040] (2) OOK: On-Off Keying, also known as binary amplitude keying (2ASK), is a unipolar non-return-to-zero code sequence used to control the opening and closing of a sinusoidal carrier.

[0041] (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.

[0042] (4) DFT Transform: Discrete Fourier Transform is the most basic method of signal analysis. It transforms the signal from the time domain to the frequency domain, and then studies the spectral structure and variation law of the signal.

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

[0044] (6) IFFT Transform: Inverse Fast Fourier Transform.

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

[0046] Figure 1 A schematic diagram of the system architecture of a communication system applying the technical solution of this application is shown.

[0047] 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 an LP-WUS signal and perform OOK modulation, phase rotation, time-frequency transformation, and other processing on the LP-WUS signal to obtain a target transmission signal for transmission to the NR terminal. 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.

[0048] The technical solution provided in this application embodiment can be applied to a base station, which generates an LP-WUS signal and performs modulation, phase rotation, time-frequency conversion and other processing on it.

[0049] The signal generation method in this application can be applied to any scenario involving generating an LP-WUS signal and using the LP-WUS signal to wake up the main wireless module. The signal generation method provided in this application will be described in detail below with reference to specific embodiments.

[0050] Figure 2A 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:

[0051] Step S210: Generate a first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal, and perform phase rotation on the first OOK waveform using a sequence of multiple phase rotation factors with the same magnitude and phases changing according to a preset rule.

[0052] The signal generation method of this application, after generating an LP-WUS signal, modulates the LP-WUS signal to generate a first OOK waveform, and then uses a sequence of phase rotation factors containing multiple phase rotation factors with the same magnitude and phases changing according to a preset rule to rotate the first OOK waveform to obtain a phase-rotated OOK waveform. The signal generation method in this application can disperse overly concentrated frequency domain energy by rotating the phase of the first OOK waveform generated based on the LP-WUS signal, thereby improving the frequency diversity gain of the LP-WUS signal. This ensures that the LP-WUS signal still has good performance when passing through a frequency-selective fading channel, avoiding complete waveform distortion at the receiving end. This, in turn, ensures that the receiving end can detect the signal through envelope detection, further ensuring that the wake-up signal receiver can wake up the MR in a timely manner, achieving the power-saving design requirements.

[0053] 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.

[0054] 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.

[0055] In an exemplary embodiment 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, this 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 expanded, 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 phase-rotated, and finally, the OOK waveform obtained by phase rotation is time-frequency transformed to obtain the corresponding target signal. The target signal is then mapped to the RE corresponding to each OFDM symbol. This is... Figure 3 The modulation mapping process is shown in the diagram. 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 significant amount of energy, making it difficult to distinguish using envelope detection. Therefore, by performing phase rotation on the first OOK waveform in the modulation mapping process, the final generated target signal is dispersed rather than concentrated, thus ensuring that the signal finally transmitted to the receiving end has a high frequency diversity gain. Even when passing through a frequency-selective fading channel, it can still maintain good performance, ensuring the detection of the LP-WUS signal.

[0056] Next, for Figure 2 The steps of the signal generation method shown are explained in detail.

[0057] In step S210, a first binary keying signal OOK waveform is generated based on the low-power wake-up LP-WUS signal. The first OOK waveform is then phase-rotated using a sequence of phase rotation factors that have the same magnitude and whose phases change according to a preset rule, in order to obtain a phase-rotated OOK waveform.

[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, the signal block can be expanded and OOK modulated to generate a first OOK waveform. When expanding the signal block, the expansion can be based on the bandwidth value corresponding to the subsequent time-frequency conversion method for the phase-rotated waveform. In the embodiments of this application, after phase rotation of the first OOK waveform, DFT precoding or LS optimization is used to process the phase-rotated OOK waveform. Therefore, the signal block can be expanded based on the DFT bandwidth value and the LS optimization bandwidth value. When using DFT bandwidth for expansion, the bandwidth value can be set to the LP-WUS signal bandwidth. This avoids truncating the target signal according to the LP-WUS signal bandwidth after DFT precoding. When the LP-WUS signal bandwidth is less than the maximum number of bits corresponding to the OFDM symbol, the portion of the OFDM symbol not covered by the expanded signal is filled with zeros. When using LS optimized bandwidth for expansion, the bandwidth value 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 bandwidth can be used to fill the signal bits in the OFDM symbol, or other bandwidth values ​​can be selected to expand the signal block. When the signal bits in the OFDM symbol are not filled, the portion 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 expanded, each bit in the signal block is expanded by the same factor; for example, an OFDM symbol is allocated to... The bandwidth to be expanded is bits. 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 frequency diversity gain of the LP-WUS signal can be improved by phase rotation of the first OOK waveform. Specifically, a phase-rotated OOK waveform can be generated by using a sequence of phase rotation factors containing multiple phase rotation factors with the same magnitude and phases varying according to a preset rule to perform phase rotation on the first OOK waveform.

[0063] Since one first OOK waveform corresponds to one OFDM symbol, the sequence used to perform phase rotation on the first OOK waveform also corresponds to the OFDM symbol. The sequences corresponding to different OFDM symbols may be the same or different. In the embodiments of this application, the sequence can be constructed based on phase rotation factors generated with different phase change modes. The different phase change modes are: phase changes at preset intervals, or phase parts repeat and the phases of non-repeating parts change at preset intervals. Next, the construction method of the sequence used to perform phase rotation on the first OOK waveform will be described in detail.

[0064] (1) The phase changes at preset intervals.

[0065] Figure 4 This schematically illustrates a process for determining the sequence used for phase rotation based on a phase change pattern that varies at preset intervals, such as... Figure 4 As shown, the process includes at least steps S401 to S402, specifically:

[0066] In step S401, a sequence of changes is determined based on a preset bandwidth value, the preset interval, and the parameters corresponding to the OFDM symbol. The sequence of changes and the phase rotation parameters are then subjected to a modulo-modulo operation to obtain a sequence of phase rotation coefficients.

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

[0068] For ease of description, let's label the preset bandwidth value as N, the preset interval as p, and the parameter corresponding to the OFDM symbol as r. Then, based on the preset bandwidth value and the preset interval, we can obtain an initial change sequence. Where i is the index corresponding to the change, and N and p are positive integers. Furthermore, based on the initial change sequence and the parameters corresponding to the OFDM symbols, the change sequence can be obtained as (m... i +r).

[0069] After obtaining the sequence of changes, a modulo-modulo operation can be performed on the sequence of changes and the phase rotation parameter to obtain the sequence of phase rotation coefficients. Similarly, the phase rotation parameter can be denoted as μ, and then the sequence of phase rotation coefficients can be obtained as follows: The phase rotation parameter μ can be any positive number. Furthermore, the phase rotation parameter can also be a value determined according to the method for determining the preset bandwidth value. Specifically, when the preset bandwidth value is the bandwidth value corresponding to the ON waveform in the first OOK waveform, When the preset bandwidth value is the bandwidth value in the first OOK waveform, ;in, This refers to the number of bits contained in the extended signal block corresponding to the OFDM symbol. The number of bits carried by an OFDM symbol for rate matching.

[0070] In step S402, with As a phase rotation basis, a plurality of phase rotation factors are generated based on the phase rotation basis and the phase rotation coefficient sequence, and the sequence is constructed based on the phase rotation factors.

[0071] In an exemplary embodiment of this application, after determining the phase rotation coefficient sequence, multiple phase rotation factors can be generated based on the phase rotation basis and the phase rotation coefficient sequence. Then, a sequence for phase rotation of the first OOK waveform can be constructed based on the multiple phase rotation factors, wherein the phase rotation basis is... The constructed sequence is as shown in expression (1):

[0072] (1)

[0073] in, The sequence is described above; The index of the OFDM symbol; m i +r represents the sequence of changes; i represents the index of the change, a non-negative integer; N represents the preset bandwidth value, an arbitrary positive integer; r represents the parameter corresponding to the OFDM symbol, a non-negative integer; μ represents the phase rotation parameter, an arbitrary positive number; p represents the preset interval; m i mod μ is the phase rotation coefficient sequence, and q can be 2.

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

[0075] Figure 5 This schematically illustrates a process for determining the sequence used for phase rotation based on a phase change pattern that varies at preset intervals, such as... Figure 5 As shown, in step S501, a sequence of changes is determined based on a preset bandwidth value, the preset interval, and parameters corresponding to the OFDM symbol. A modulo-modulo operation is then performed on the sequence of changes and the phase rotation parameters to obtain a sequence of phase rotation coefficients. In step S502, using... As a phase rotation basis, a plurality of phase rotation factors are generated based on the phase rotation basis and the phase rotation coefficient sequence, and an initial sequence is constructed based on the phase rotation factors; in step S503, the phase rotation factors to be repeated in the initial sequence are repeated according to a preset repetition amount to obtain the sequence.

[0076] contrast Figure 4 and Figure 5 As can be seen, the initial sequence is the sequence obtained when the phase changes at a preset interval, as shown in expression (1). By repeating some of the phase rotation factors to be repeated in the initial sequence, the final sequence used to rotate the phase of the first OOK waveform can be obtained. In the embodiments of this application, the number of phase rotation factors to be repeated is less than the number of phase rotation factors contained in the initial sequence. At the same time, the preset repetition amount does not exceed half of the total signal amount in the extended signal block corresponding to the OFDM symbol. The specific value can be set according to actual needs. This application does not make specific limitations on this. It should be added that in the embodiments of this disclosure, q can be 2 as an example for explanation.

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

[0078] (2)

[0079] For example, when the phase rotation factor to be repeated is the phase rotation factor of the 0th and 1st positions, the sequence can be converted into expression (3):

[0080] (3)

[0081] Where M is the preset number of repetitions and is a positive integer greater than 1.

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

[0083] From a waveform transformation perspective, phase rotation of the first OOK waveform can be performed by determining the waveform to be rotated within the first OOK waveform based on the method used to determine the preset bandwidth value. For example, if the preset bandwidth value is determined based on the bandwidth value corresponding to the ON waveform, then the ON waveform can be used as the waveform to be rotated. Similarly, if the preset bandwidth value is determined based on the bandwidth value corresponding to the first OOK waveform, then the first OOK waveform can be used as the waveform to be rotated, and so on. Then, the phase rotation of the waveform to be rotated is performed according to the phase rotation factor in the sequence to obtain the phase-rotated OOK waveform. Specifically, mathematically, this involves rotating the signal matrix corresponding to the first OOK waveform using a phase rotation matrix corresponding to the sequence. Let α be the phase rotation matrix... μ The signal matrix corresponding to the first OOK waveform is labeled as b. n Then the phase rotation OOK waveform is α. μ b n .

[0084] Since phase rotation of the first OOK waveform is essentially a phase transformation of the signals that make up the first OOK waveform, from a signal transformation perspective, when performing phase rotation on the first OOK waveform, the target phase rotation factor corresponding to the signal in the extended signal block corresponding to the first OOK waveform can be determined from a sequence containing multiple phase rotation factors. Then, the signal is phase-rotated according to the target phase rotation factor to obtain the phase-rotated signal. After completing the traversal, the phase-rotated OOK waveform can be constructed from all the phase-rotated signals. Specifically, in mathematical operations, the phase rotation can be performed with the index... The extended signal block corresponding to the OFDM symbol is marked as For the signals in this extended signal block, the target phase rotation factor corresponding to it is determined from the sequence, and the phase of the corresponding signal is rotated using the target phase rotation factor, that is, according to... Perform phase rotation, where i is the index of the signal in the extended signal block. j is the index of the phase rotation factor in the sequence, which is a non-negative integer. i and j can be the same or different. Therefore, the bitstream corresponding to this OFDM symbol can be obtained as follows: For those containing M bit For the LP-WUS signal, the final bitstream is .

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

[0086] Figure 6 The diagram schematically illustrates the signal interface after phase rotation of the high-potential waveform in the first OOK waveform using a sequence determined based on a preset interval of 1. Figure 6 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}. Since the high-level waveform occupies 4 bits, the preset bandwidth value N=4 can be determined. When the phase rotation parameter... When the parameter r=0 corresponding to this OFDM symbol, the sequence used for phase rotation can be obtained as follows: Based on this sequence, the high-potential signal in the extended signal block can be phase-rotated, resulting in a rotated signal block of { 0000 0000}.

[0087] Figure 7 The diagram schematically illustrates the signal interface after phase rotation of the first OOK waveform based on a sequence determined by a preset interval of 1, as shown below. Figure 7 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}. Since the extended signal block contains 16 bits, the preset bandwidth value N = 16 can be determined. When the phase rotation parameter... When the parameter r=1 corresponding to this OFDM symbol, the sequence used for phase rotation can be obtained as follows: Based on this sequence, the phase of the extended signal block can be rotated. Since the signal remains 0 after rotation when it is 0, the rotated signal block can be obtained as { 0000 0000}.

[0088] Figure 8 The diagram schematically illustrates the signal interface after phase rotation of the high-potential waveform of the first OOK waveform based on a sequence determined by a preset interval of 5. Figure 8 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, so the preset bandwidth value N=4 can be determined, when the phase rotation parameter When the parameter r=3 corresponding to this OFDM symbol, the sequence used for phase rotation can be obtained as follows: Based on this sequence, the phase of the extended signal block can be rotated, resulting in a rotated signal block as { 0000 0000}.

[0089] Figure 9 The diagram schematically illustrates the signal interface after phase rotation of the high-potential waveform in the first OOK waveform using a sequence determined based on a preset interval 1 and a preset repetition amount 2. Figure 9 As shown, the extended signal block corresponding to one OFDM symbol is {1111000011110000}, so the preset bandwidth value N=4 can be determined, when the phase rotation parameter When the parameter r=0 corresponding to the OFDM symbol, and the phase rotation factor to be repeated is the phase rotation factor of the 0th and 1st positions, the sequence used for phase rotation can be obtained as follows: Based on the sequence, the high-potential signal in the extended signal block can be phase-rotated to obtain the rotated signal block as { 0000 0000}.

[0090] It is worth noting that although the number of phase rotation factors in the sequence is greater than the bandwidth value corresponding to the high-potential waveform, when performing phase rotation on the signal corresponding to the high-potential waveform, the rotation is only performed according to the target phase rotation factor in the sequence that corresponds to the high-potential waveform signal.

[0091] In an exemplary embodiment of this application, Figures 6-9The phase rotations shown all use phase rotation factors and signals with the same position index for phase rotation. However, in this embodiment, the method is not limited to this. Phase rotation can also be performed using phase rotation factors and signals with different position indices. For example, the phase rotation factors in the sequence can be cyclically shifted. When the number of phase rotation factors is greater than the number of signals in the waveform to be rotated, some of the phase rotation factors in the sequence can be used as target phase rotation factors corresponding to the signals in the waveform to be rotated. Figure 9 For example, the first phase rotation factor in the sequence can be used as the target phase rotation factor corresponding to the 0th signal in the high-level signal, the second phase rotation factor as the target phase rotation factor corresponding to the 1st signal in the high-level signal, the third phase rotation factor as the target phase rotation factor corresponding to the 2nd signal in the high-level signal, and the fourth phase rotation factor as the target phase rotation factor corresponding to the 3rd signal in the high-level signal. The resulting rotated signal block is { 0000 0000}; When the number of phase rotation factors is the same as the number of signals, the second phase rotation factor is used to rotate the phase of the 0th signal. Then, the 0th phase rotation factor is used to rotate the phase of the second-to-last signal, the 1st phase rotation factor is used to rotate the phase of the last signal, and so on.

[0092] In an exemplary embodiment of this application, after obtaining the phase-rotated OOK waveform, the phase-rotated OOK waveform can be precoded using DFT or optimized using least squares (LS) to obtain a target signal corresponding to the phase-rotated OOK waveform. Furthermore, a target transmission signal can be generated based on the target signal and sent to the UE.

[0093] In the exemplary embodiments of this application, similar to phase rotation of the first OOK waveform, DFT precoding or LS optimization can also be divided into matrix-level operations and signal-level operations. Since matrix-level DFT 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 precoding schemes, and signal-level LS optimization schemes will be described in detail below.

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

[0095] Before describing the LS optimization scheme in the embodiments of this application, we will first briefly describe the existing LS-optimized OOK waveform generation method.

[0096] The 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 (4):

[0097] (4)

[0098] Where, x LS For the target signal optimized by LS; F inv This is the inverse Fourier transform matrix.

[0099] F inv= , G is the cutoff matrix.

[0100] G= b n For extended signal blocks.

[0101] Expanding the LS-optimized approximation, we obtain the expression shown in (5):

[0102] (5)

[0103] Expression (5) 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 will be 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.

[0104] 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 Equation (6):

[0105] (6)

[0106] Where, x LS For the target 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 wThis 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.

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

[0108]

[0109] = (7)

[0110] According to formula (6), by changing k c Since the phase can be shifted, a suitable generating phase can be selected for the Fourier transform matrix to cancel out the pre-distorted truth position, so that the result still becomes the FFT effect based on LS optimization, as shown in expression (8):

[0111] (8)

[0112] While the shiftable extended generation method described above can achieve a good approximation effect, 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, resulting in complete distortion of the receiver waveform. In view of this, before obtaining the target signal using formula (6), a sequence can be inserted for phase rotation. This sequence is used to perform phase rotation on the signal in the first OOK waveform, and then the corresponding target signal is obtained based on formula (6). The expression of the target signal obtained after LS optimization is shown in formula (9):

[0113] (9)

[0114] Where, α μ The sequence used for phase rotation is the same as the sequence α described above. l (m i Equivalent to α μ b is a sequence consisting of different phase rotation factors corresponding to the same OFDM symbol; n To extend the signal sequence, and in conjunction with the extended signal block b described above. l (i) Equivalent, i.e., b nIt is a sequence of extended signals corresponding to the same OFDM symbol.

[0115] Expanding equation (9), we can obtain the target signal after LS optimization as shown in equation (10):

[0116] (10)

[0117] The rightmost sequence represents the final generated target signal, where each signal is mapped to a different RE on the same OFDM symbol. Analysis of the signal expression reveals 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-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.

[0118] (2) Signal-level DFT precoding scheme

[0119] 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 following describes how to perform signal-level processing on the phase-rotated OOK waveform to obtain the corresponding target signal in the embodiments of this application.

[0120] In an exemplary embodiment of this application, the corresponding target signal can be obtained by performing DFT precoding or LS optimization on the signal in the phase-rotated OOK waveform. When performing DFT precoding, the bandwidth value of the DFT 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 precoding can be performed according to formula (11):

[0121] (11)

[0122] Where y(·) is the target signal generated by DFT precoding; The index of the OFDM symbol, with values ​​ranging from 0 to ( ) Incrementing sequentially; k is the number of... The RE position index on each OFDM symbol takes values ​​from 0 to ( (Increase sequentially) The bandwidth value corresponding to DFT precoding; For the first Bit stream corresponding to OFDM symbols; This represents the number of bits contained in the bitstream corresponding to the LP-WUS signal.

[0123] In an exemplary embodiment of this application, according to formula (11), only one unique set needs to be determined each time. (k), then you can get the index as The target signal generated by DFT precoding corresponding to the k-th RE in the OFDM symbol. For example, take... When k=1 and k=0, according to formula (11), the expression for the target signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated as follows: .

[0124] It is worth noting that the coefficients in formula (11) Its function is to correct deviations in the generation process of the target signal, ensuring that the generated target signal is closer to the real signal.

[0125] (3) LS optimization scheme at the signal level

[0126] In an exemplary embodiment of this application, when using the LS optimization scheme for time-frequency conversion of a signal, the bandwidth value is greater than or equal to the bandwidth size; that is, the number of frequency domain points can be equal to or greater than the number of time domain points. In an embodiment of this application, LS optimization can be performed according to formula (12), as follows:

[0127] (12)

[0128] Where y(·) is the target signal generated by LS optimization; The index of the OFDM symbol, with values ​​ranging from 0 to ( (Increment sequentially; k is the index) The index of the RE position in the OFDM symbol, with values ​​ranging from 0 to ( (Increase sequentially) Optimize the corresponding bandwidth value for LS; β represents the bandwidth of the LP-WUS signal in the frequency domain; β is the power control factor. For and index The bit stream corresponding to the OFDM symbols; This represents the number of bits contained in the bitstream corresponding to the LP-WUS signal.

[0129] In an exemplary embodiment of this application, due to the LS-optimized bandwidth value The frequency domain bandwidth is greater than that of the LP-WUS signal. However, the final mapping only requires a number of target signals equal to the frequency domain bandwidth. Therefore, during LS optimization, the target signals need to be truncated, as shown in formula (12). As shown, only [data] was retrieved. Number of points, not With each point counted, the corresponding phase also ends. The rest is discarded. In other words, in essence, LS optimization is the truncation of DFT.

[0130] In an exemplary embodiment of this application, similar to the DFT precoding scheme, according to formula (12), only a unique set needs to be determined each time. (k), then you can get the index as The target signal generated by LS optimization corresponding to the k-th RE in the OFDM symbol corresponds to the target signal in the target signal sequence shown in formula (10). For example, take When k=1 and k=0, according to formula (12), the expression for the target signal mapped to the 0th RE in the OFDM symbol with index 1 can be calculated as follows: .

[0131] It is worth noting that the power control factor β in formula (12) is used to ensure the signal-to-noise ratio (SNR).

[0132] 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.

[0133] The above embodiments describe matrix-level LS optimization schemes, signal-level DFT precoding schemes, and signal-level LS optimization schemes. These optimization schemes all share the same goal: to convert the time-domain signal corresponding to the phase-rotated OOK waveform into the target 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 precoding scheme, thus offering superior performance.

[0134] In an exemplary embodiment of this application, after obtaining the target signal corresponding to the phase rotation OOK waveform, a target transmission signal can be generated based on the target signal. The target transmission signal is the signal containing the LP-WUS signal that is transmitted to the UE.

[0135] In generating the target transmission signal based on the target signal, the target signal corresponding to the REs on each OFDM symbol, generated by the DFT precoding scheme or LS optimization scheme, can be input to the OFDM modulator and mapped onto the REs. Then, the received target signal is OFDM modulated by the OFDM modulator 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 3 Taking 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 target signal according to the above embodiment, the target signal can be mapped to different REs in the OFDM modulator. Then, frequency domain-time domain conversion processing is performed on the target signals corresponding to different signal blocks. For example, the Inverse Fast Fourier Transform (IFFT) method can be used to perform frequency domain-time domain conversion processing to obtain the time domain signal corresponding to the input target 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 transmission signal can be obtained.

[0136] 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.

[0137] Because the signal generation method in this embodiment performs phase rotation before DFT precoding or LS optimization of the first OOK waveform, frequency domain energy concentration is avoided, and the frequency diversity gain of the LP-WUS signal is improved. This 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. It has strong anti-fading capability and ensures the integrity of the LP-WUS signal received by the UE. When the envelope detection method is used 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.

[0138] 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.

[0139] This application also provides a signal generation device. Figure 10 A schematic diagram of a signal generation device 1000 is shown, which is configured in a base station, such as... Figure 10 As shown, the signal generation device 1000 may include a phase rotation module 1001, specifically:

[0140] The phase rotation module 1001 is used to generate a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal, and to perform phase rotation on the first OOK waveform using a sequence of multiple phase rotation factors with the same magnitude and phases changing according to a preset rule, so as to obtain a phase-rotated OOK waveform.

[0141] In an exemplary embodiment of this application, the phase rotation module 1001 is configured to: perform rate matching on the number of bits contained in the LP-WUS signal according to the number of bits that an orthogonal frequency division multiplexing (OFDM) symbol can carry, so as to divide the LP-WUS signal into multiple signal blocks; and perform expansion and OOK modulation on each of the signal blocks to obtain a first OOK waveform corresponding to each of the signal blocks.

[0142] In an exemplary embodiment of this application, the signal generation apparatus 1000 includes: a sequence construction module, configured to construct the sequence according to phase rotation factors generated in different phase change modes before performing phase rotation on the first OOK waveform using a sequence containing multiple phase rotation factors having the same magnitude and whose phases change according to a preset rule, wherein the different phase change modes are: phase changes at a preset interval, or phase parts repeat and the phase of non-repeating parts changes at a preset interval.

[0143] In an exemplary embodiment of this application, when the different phase change modes are phase changes at preset intervals, the sequence construction module includes: a first processing unit, configured to determine a change sequence based on a preset bandwidth value, the preset interval, and parameters corresponding to OFDM symbols, and to perform a modulo-modulo operation on the change sequence and phase rotation parameters to obtain a phase rotation coefficient sequence.

[0144] In an exemplary embodiment of this application, a second processing unit is further included, for using... As a phase rotation basis, a plurality of phase rotation factors are generated based on the phase rotation basis and the phase rotation coefficient sequence, and the sequence is constructed based on the phase rotation factors.

[0145] In an exemplary embodiment of this application, when the different phase change modes are characterized by phase partial repetition and phase of non-repetition parts changing at preset intervals, the sequence construction module includes: a third processing unit, configured to determine a change sequence based on a preset bandwidth value, the preset interval, and parameters corresponding to OFDM symbols, and to perform a modulo-modulo operation on the change sequence and phase rotation parameters to obtain a phase rotation coefficient sequence; and a fourth processing unit, configured to... The fifth processing unit is used to generate multiple phase rotation factors based on the phase rotation basis and the phase rotation coefficient sequence, and to construct an initial sequence based on the phase rotation factors; the fifth processing unit is used to repeat the phase rotation factors to be repeated in the initial sequence according to a preset repetition amount to obtain the sequence.

[0146] In an exemplary embodiment of this application, the second processing unit is configured such that the sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relation (1):

[0147] (1)

[0148] in, The sequence is described above; The index of the OFDM symbol; m i +r represents the sequence of changes; i represents the index of the change, a non-negative integer; N represents the preset bandwidth value, an arbitrary positive integer; r represents the parameter corresponding to the OFDM symbol, a non-negative integer; μ represents the phase rotation parameter, an arbitrary positive number; p represents the preset interval; m i mod μ is the sequence of phase rotation coefficients.

[0149] In an exemplary embodiment of this application, the fourth processing unit is configured such that the initial sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relation (2):

[0150] (2)

[0151] in, The initial sequence; The index of the OFDM symbol; m i +r represents the sequence of changes; i represents the index of the change, a non-negative integer; N represents the preset bandwidth value, an arbitrary positive integer; r represents the parameter corresponding to the OFDM symbol, a non-negative integer; μ represents the phase rotation parameter, an arbitrary positive number; p represents the preset interval; m i mod μ is the sequence of phase rotation coefficients.

[0152] In an exemplary embodiment of this application, the sequence construction module is configured such that: when the indices of the OFDM symbols are different, the r corresponding to each OFDM symbol is 0; when the indices of the OFDM symbols are different, the r corresponding to each OFDM symbol is the index of the OFDM symbol; or, when the indices of the OFDM symbols are different, the r corresponding to each OFDM symbol is any value that is different from each other.

[0153] In an exemplary embodiment of this application, the preset bandwidth value is the bandwidth value of the corresponding ON waveform in the first OOK waveform or the bandwidth value in the first OOK waveform; the sequence construction module is configured to: when the preset bandwidth value is the bandwidth value corresponding to the ON waveform, When the preset bandwidth value is the bandwidth value in the first OOK waveform, ;in, The number of bits contained in the extended signal block corresponding to the OFDM symbol. The number of bits carried by an OFDM symbol for rate matching.

[0154] In an exemplary embodiment of this application, the signal generation apparatus 1000 includes: an adjustment module, configured to expand the signal block according to the bandwidth value corresponding to DFT precoding or least squares LS optimization before performing phase rotation on the first OOK waveform using a sequence containing multiple phase rotation factors having the same modulus and whose phases change according to a preset rule, and to perform OOK modulation on the expanded signal block to obtain the first OOK waveform.

[0155] In an exemplary embodiment of this application, the adjustment module is configured to: when performing DFT precoding on the phase-rotated OOK waveform, expand the signal block corresponding to each OFDM symbol according to the bandwidth value corresponding to the LP-WUS signal bandwidth, and fill the portion of the OFDM symbol not covered by the expanded signal with zeros; when performing LS optimization on the phase-rotated OOK waveform, expand the signal block corresponding to each OFDM symbol according to the bandwidth value corresponding to the LS optimization, and fill the portion of the OFDM symbol not covered by the expanded signal with zeros.

[0156] In an exemplary embodiment of this application, the phase rotation module 1001 is configured to: determine a waveform to be rotated corresponding to the preset bandwidth value in the first OOK waveform according to the method for determining the preset bandwidth value; and perform phase rotation on the waveform to be rotated according to the sequence to obtain the phase-rotated OOK waveform.

[0157] In an exemplary embodiment of this application, the phase rotation module 1001 is configured to: determine a target phase rotation factor corresponding to the signal in the extended signal block from the sequence; perform phase rotation on the signal according to the target phase rotation factor to obtain a phase rotation signal; and construct the phase rotation OOK waveform based on all the phase rotation signals.

[0158] In an exemplary embodiment of this application, the signal generation device 1000 further includes an optimization module, configured to perform DFT precoding or least squares LS optimization on the phase-rotated OOK waveform to obtain a target signal corresponding to the phase-rotated OOK waveform, and generate a target transmission signal based on the target signal.

[0159] In an exemplary embodiment of this application, the optimization module is configured such that the index of the target signal and the OFDM symbol, the RE position index on the OFDM symbol, and the bandwidth value corresponding to the DFT precoding satisfy the relationship (3):

[0160] (3)

[0161] Where y(·) is the target signal; The index of the OFDM symbol, with values ​​ranging from 0 to ( (Increment sequentially; k is the index) The index of the RE position in the OFDM symbol takes values ​​from 0 to ( (Increase sequentially) The bandwidth value corresponding to the DFT precoding; For the first Bit stream corresponding to OFDM symbols; The number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0162] In an exemplary embodiment of this application, the optimization module is configured such that: the index of the target signal and 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 relationship (4):

[0163] (4)

[0164] Where y(·) is the target signal; The index of the OFDM symbol, with values ​​ranging from 0 to ( (Increment sequentially; k is the index) The index of the RE position in the OFDM symbol takes values ​​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. For the first Bit stream corresponding to OFDM symbols; The number of bits contained in the bit stream corresponding to the LP-WUS signal.

[0165] In an exemplary embodiment of this application, the optimization module is configured to perform LS optimization on the phase-rotated OOK waveform based on the truncation matrix, the Fourier transform inverse matrix, and the phase transformation factor, wherein the target signal satisfies the relation (5) with the phase-rotated OOK waveform, the truncation matrix, the Fourier transform inverse matrix, and the phase transformation factor:

[0166] (5)

[0167] Among them, X LS For the target signal sequence, X LS Each element in the table represents a target 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 change factor. c The starting position for frequency domain mapping can be any RE in any resource block RB; The phase rotation OOK waveform; The sequence is described above; This is the first OOK waveform.

[0168] In an exemplary embodiment of this application, the optimization module is configured to: map the target signal corresponding to the RE on each of the OFDM symbols onto the RE; and perform OFDM modulation on the target signal.

[0169] In an exemplary embodiment of this application, the signal generation device 1000 is further configured to: transmit the target transmission signal to a wake-up signal receiver in a user terminal UE through a multipath fading channel, perform envelope detection on the target transmission signal through the wake-up signal receiver to obtain the LP-WUS signal, and wake up the main radio module based on the LP-WUS signal.

[0170] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, 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.

[0171] Furthermore, although the steps of the method in this application 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. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0172] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, mobile terminal, or network device, etc.) to execute the methods according to the embodiments of this application.

[0173] Figure 11 A schematic block diagram of a computer system architecture for implementing an electronic device according to embodiments of the present application is shown. The electronic device may be disposed in a base station.

[0174] It should be noted that, Figure 11The computer system 1100 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0175] like Figure 11 As shown, the computer system 1100 includes a central processing unit (CPU) 1101, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 1102 or programs loaded from storage section 1108 into random access memory (RAM). The RAM 1103 also stores various programs and data required for system operation. The CPU 1101, ROM 1102, and RAM 1103 are interconnected via a bus 1104. An input / output interface 1105 (I / O interface) is also connected to the bus 1104.

[0176] In some embodiments, the following components are connected to the input / output interface 1105: an input section 1106 including a keyboard, mouse, etc.; an output section 1107 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 1108 including a hard disk, etc.; and a communication section 1109 including a network interface card such as a local area network card, modem, etc. The communication section 1109 performs communication processing via a network such as the Internet. A drive 1110 is also connected to the input / output interface 1105 as needed. A removable medium 1111, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 1110 as needed so that computer programs read from it can be installed into the storage section 1108 as needed.

[0177] Specifically, according to embodiments of this application, the processes described in the various method flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1109, and / or installed from removable medium 1111. When the computer program is executed by central processing unit 1101, it performs various functions defined in the system of this application.

[0178] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium, a computer-readable medium, or any combination of the two. A computer-readable medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, a computer-readable medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0179] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0180] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, 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.

[0181] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause an electronic device to execute the method according to the embodiments of this application.

[0182] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A signal generation method, characterized in that, include: The first binary keying signal OOK waveform is generated based on the low-power wake-up LP-WUS signal, and the first OOK waveform is phase rotated using a sequence of multiple phase rotation factors with the same magnitude and phases changing according to a preset rule. The sequence is constructed based on a phase rotation factor generated with different phase change modes, wherein the different phase change modes are: the phase changes at a preset interval, or the phase part repeats and the phase of the non-repeating part changes at a preset interval.

2. 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 expanded and OOK modulated to obtain a first OOK waveform corresponding to each of the signal blocks.

3. The method according to claim 1, characterized in that, When the different phase change modes involve phase changes at preset intervals, the method further includes: by As a phase rotation basis, a plurality of phase rotation factors are generated based on the phase rotation basis and the phase rotation coefficient sequence, and the sequence is constructed based on the phase rotation factors.

4. The method according to claim 1, characterized in that, When the different phase change patterns involve phase repetition and non-repetitive phase changes at preset intervals, constructing the sequence based on the phase rotation factors generated by the different phase change patterns includes: The sequence of changes is determined based on the preset bandwidth value, the preset interval, and the parameters corresponding to the OFDM symbol. The sequence of changes and the phase rotation parameters are then subjected to modulo and remainder operations to obtain the phase rotation coefficient sequence. by As a phase rotation basis, a plurality of phase rotation factors are generated based on the phase rotation basis and the phase rotation coefficient sequence, and an initial sequence is constructed based on the phase rotation factors; The phase rotation factor to be repeated in the initial sequence is repeated according to a preset repetition amount to obtain the sequence.

5. The method according to claim 4, characterized in that, The step of generating multiple phase rotation factors based on the phase rotation basis and the phase rotation coefficient sequence, and constructing the sequence based on the phase rotation factors, includes: The sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relationship (1): （1） in, The sequence is described above; The index of the OFDM symbol; m i +r represents the sequence of changes; i represents the index of the change, a non-negative integer; N represents the preset bandwidth value, an arbitrary positive integer; r represents the parameter corresponding to the OFDM symbol, a non-negative integer; μ represents the phase rotation parameter, an arbitrary positive number; p represents the preset interval; m i mod μ is the sequence of phase rotation coefficients.

6. The method according to claim 4, characterized in that, The step of generating multiple phase rotation factors based on the phase rotation basis and the phase rotation coefficient sequence, and constructing an initial sequence based on the phase rotation factors, includes: The initial sequence, the phase rotation basis, and the phase rotation coefficient sequence satisfy the relationship (2): （2） in, The initial sequence; The index of the OFDM symbol; m i +r represents the sequence of changes; i represents the index of the change, a non-negative integer; N represents the preset bandwidth value, an arbitrary positive integer; r represents the parameter corresponding to the OFDM symbol, a non-negative integer; μ represents the phase rotation parameter, an arbitrary positive number; p represents the preset interval; m i mod μ is the sequence of phase rotation coefficients.

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

8. The method according to claim 5, characterized in that, The preset bandwidth value is the bandwidth value of the corresponding ON waveform in the first OOK waveform or the bandwidth value in the first OOK waveform; the method further includes: When the preset bandwidth value is the bandwidth value corresponding to the ON waveform ; When the preset bandwidth value is the bandwidth value in the first OOK waveform ; in, The number of bits contained in the extended signal block corresponding to the OFDM symbol. The number of bits carried by an OFDM symbol for rate matching.

9. The method according to claim 2, characterized in that, Before performing phase rotation on the first OOK waveform using a sequence of phase rotation factors containing multiple phase rotation factors with the same magnitude and phases varying according to a preset pattern, the method further includes: The signal block is expanded according to the bandwidth value corresponding to DFT precoding or least squares LS optimization, and the expanded signal block is subjected to OOK modulation to obtain the first OOK waveform.

10. The method according to claim 9, characterized in that, The step of expanding the signal block according to the bandwidth value corresponding to DFT precoding or least squares LS optimization includes: When performing DFT precoding on the phase-rotated OOK waveform, the signal block corresponding to each OFDM symbol is expanded according to the bandwidth value corresponding to the bandwidth size of the LP-WUS signal; When performing LS optimization on the phase-rotated OOK waveform, the signal block corresponding to each OFDM symbol is expanded according to the bandwidth value corresponding to the LS optimization.

11. The method according to claim 8, characterized in that, The step of performing phase rotation on the first OOK waveform using a sequence of phase rotation factors having the same magnitude and whose phases change according to a preset rule includes: Based on the method for determining the preset bandwidth value, a waveform to be rotated corresponding to the preset bandwidth value is determined in the first OOK waveform; The waveform to be rotated is phase-rotated according to the sequence to obtain the phase-rotated OOK waveform.

12. The method according to claim 8, characterized in that, The step of performing phase rotation on the first OOK waveform using a sequence of phase rotation factors having the same magnitude and whose phases change according to a preset rule includes: Determine the target phase rotation factor corresponding to the signal in the extended signal block from the sequence; The signal is phase-rotated according to the target phase rotation factor to obtain a phase-rotated signal; The phase rotation OOK waveform is constructed based on all the phase rotation signals.

13. The method according to claim 2, characterized in that, The method further includes: The phase-rotated OOK waveform is precoded using DFT or optimized using least squares (LS) to obtain a target signal corresponding to the phase-rotated OOK waveform, and a target transmission signal is generated based on the target signal.

14. The method according to claim 13, characterized in that, The step of performing DFT precoding on the phase-rotated OOK waveform to obtain the target signal corresponding to the phase-rotated OOK waveform includes: The index of the target signal and the OFDM symbol, the RE position index on the OFDM symbol, and the bandwidth value corresponding to the DFT precoding satisfy the relationship (3): （3） Where y(·) is the target signal; The index of the OFDM symbol, with values ​​ranging from 0 to ( (Increment sequentially; k is the index) The index of the RE position in the OFDM symbol takes values ​​from 0 to ( (Increase sequentially) The bandwidth value corresponding to the DFT precoding; For the first Bit stream corresponding to OFDM symbols; The number of bits contained in the bit stream corresponding to the LP-WUS signal.

15. The method according to claim 13, characterized in that, The step of performing LS optimization on the phase-rotated OOK waveform to obtain the target signal corresponding to the phase-rotated OOK waveform includes: The index of the target signal and 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 relationship (4): （4） Where y(·) is the target signal; The index of the OFDM symbol, with values ​​ranging from 0 to ( (Increment sequentially; k is the index) The index of the RE position in the OFDM symbol takes values ​​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. For the first Bit stream corresponding to OFDM symbols; The number of bits contained in the bit stream corresponding to the LP-WUS signal.

16. The method according to claim 13, characterized in that, The step of performing LS optimization on the phase-rotated OOK waveform to obtain the target signal corresponding to the phase-rotated OOK waveform includes: The phase-rotated OOK waveform is subjected to LS optimization based on the truncation matrix, the Fourier transform inverse matrix, and the phase transformation factor, wherein the target signal satisfies the relationship (5) with the phase-rotated OOK waveform, the truncation matrix, the Fourier transform inverse matrix, and the phase transformation factor: （5） Among them, X LS For the target signal sequence, X LS Each element in the table represents a target 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 change factor. c The starting position for frequency domain mapping can be any RE in any resource block RB; The phase rotation OOK waveform; The sequence is described above; This is the first OOK waveform.

17. The method according to any one of claims 14-16, characterized in that, The step of generating a target transmission signal based on the target signal includes: Map the target signal corresponding to the RE on each OFDM symbol onto the RE; The target signal is modulated using OFDM.

18. The method according to claim 13, 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.

19. A signal receiving method, characterized in that, Applied to a user terminal, the method includes: Listen to or receive a first OOK waveform sent by a base station; the first OOK waveform is obtained by the signal generation method according to any one of claims 1-18.

20. A signal generation device, characterized in that, include: The phase rotation module is used to generate a first binary keying signal OOK waveform based on the low-power wake-up LP-WUS signal, and to perform phase rotation on the first OOK waveform using a sequence of multiple phase rotation factors with the same magnitude and phases changing according to a preset rule. The sequence is constructed based on a phase rotation factor generated with different phase change modes, wherein the different phase change modes are: the phase changes at a preset interval, or the phase part repeats and the phase of the non-repeating part changes at a preset interval.

21. The signal generation apparatus according to claim 20, 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 phase-rotated OOK waveform to obtain a target signal corresponding to the phase-rotated OOK waveform, and generate a target transmission signal based on the target signal.

22. A communication system, characterized in that, include: A base station is used to generate a low-power wake-up LP-WUS signal and generate a first binary keying signal OOK waveform based on the LP-WUS signal. The first OOK waveform is phase rotated using a sequence of phase rotation factors that have the same magnitude and whose phases change according to a preset rule. The sequence is constructed based on phase rotation factors generated in different phase change modes. The different phase change modes are: the phase changes at a preset interval, or the phase part repeats and the phase of the non-repeating part changes at a preset interval. The phase-rotated OOK waveform is precoded using DFT or optimized using least squares (LS) to obtain a target signal corresponding to the phase-rotated OOK waveform, and a target transmission signal is generated based on the target 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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