WO2020125455A1

WO2020125455A1 - Signal processing method and apparatus

Info

Publication number: WO2020125455A1
Application number: PCT/CN2019/123758
Authority: WO
Inventors: 陈庆勇; 陈磊
Original assignee: 华为技术有限公司
Priority date: 2018-12-19
Filing date: 2019-12-06
Publication date: 2020-06-25
Also published as: CN111343120A; CN111343120B

Abstract

Disclosed are a signal processing method and apparatus, wherein same are used for realizing low power consumption and low cost during a signal detection process. The method comprises: a first device generating an envelope signal, wherein the process of generating the envelope signal comprises any one of or a combination of any few of the following: performing a head and tail zero padding operation on encoding information; using pi/2-binary on-off keying (OOK) modulation; performing, with regard to each orthogonal frequency-division multiplexing (OFDM) symbol in an up-sampling time-domain signal, a cyclic right shift on an up-sampling sample point number corresponding to half a Pi/2-OOK modulation symbol, wherein the up-sampling time-domain signal comprises one or more OFDM symbols; or adding a zero cyclic prefix to each OFDM symbol; and the first device sending the envelope signal to a second device.

Description

Signal processing method and device

Cross-reference of related applications

This application requires the priority of the Chinese patent application filed on December 19, 2018 in the Chinese Patent Office with the application number 201811558723.8 and the application name "a signal processing method and device", the entire contents of which are incorporated by reference in this application .

Technical field

Embodiments of the present application relate to the field of communication technologies, and in particular, to a signal processing method and device.

Background technique

Terminals in the narrow-band Internet of Things (NB-IoT) generally use 5 watt-hour (Wh) batteries, and can only send data at a very low frequency, so it is not possible to replace batteries frequently. In addition, the NB-IoT module is too large, uses more batteries, and has a higher cost.

In order to save the power consumption of NB-IoT terminal batteries, NB-IoT introduces a power saving mode (PSM). The PSM mode refers to that the terminal performs deep sleep during non-business periods and does not receive downlink data. The NB-IoT network device buffers the downlink data that needs to be sent to the terminal. When the terminal actively sends uplink data, the NB-IoT network device will send the buffered downlink data to the terminal, and the terminal may receive the buffered downlink data from the network device.

It can be seen that the existing NB-IoT system cannot yet meet the requirements of low power consumption and low cost in terms of signal detection.

Summary of the invention

The embodiments of the present application provide a signal processing method and device to solve the problem that the signal detection in the NB-IoT system cannot yet achieve the requirements of low power consumption and low cost.

The specific technical solutions provided by the embodiments of the present application are as follows:

In a first aspect, a signal processing method is provided. The method may be called a first device. The method is implemented by the following steps: the first device generates an envelope signal, wherein the process of generating the envelope signal includes the following Any one or any combination of the following: first and last zero padding operation on the coded information; pi/2-binary on-off keying OOK modulation; for each orthogonal frequency division multiplexing OFDM symbol in the up-sampled time domain signal , Cyclically shifting the number of up-sampling samples corresponding to half a Pi/2-OOK modulation symbol, where the up-sampling time-domain signal includes one or more OFDM symbols; or adding a zero-cycle prefix to each OFDM symbol; The first device sends the envelope signal to the second device. By circularly shifting the number of up-sampling samples corresponding to half a Pi/2-OOK modulation symbol right, a waveform closer to the ideal signal is obtained, making the envelope clearer. The use of pi/2-OOK modulation makes the envelope signal continuously have a high-amplitude portion of 1, the pits are smaller, and it is less likely that the wrong judgment will be 0, which makes the envelope signal clearer. The use of zero cyclic prefix and first and last zero padding operations can make a small amplitude signal appear before and after each symbol for a period of time, so that the obtained envelope signal can be distinguished from the data frame of the ordinary DFT-s-OFDM waveform. To achieve low power consumption and low cost in signal detection.

In a possible design, the first device is a network device, the second device is a terminal, and the envelope signal is used to wake up the terminal. This helps to wake up the terminal in time, further reduces the power consumption of the terminal from sleep to wake up and reduces the transmission delay of downlink services.

In a possible design, the first device is a network device, the second device is a backscattering device, and the envelope signal is used to carry data; or, the first device is a terminal, and the first The second device is a backscattering device, and the envelope signal is used to carry data. Since the power consumption of detecting the envelope signal is extremely low, the backscattering device can achieve low power consumption and low cost in the process of generating and transmitting the reflected signal.

In a possible design, before the network device sends the envelope signal to the terminal, the network device confirms that downlink data needs to be sent to the terminal, and the downlink data is downlink data of a real-time service or a non-real-time service This will help ensure the timeliness of the downlink data transmission, improve the terminal's experience of using real-time services, and meet the requirements of downlink data delay services.

In a possible design, after the network device sends the envelope signal to the terminal, the network device sends the downlink data to the terminal.

In a possible design, the envelope signal includes an identification ID of the second device or a group ID of the group where the second device is located.

In a second aspect, a signal processing method is provided. The method may be called a first device. The method is implemented by the following steps: the first device generates an envelope signal, wherein the process of generating the envelope signal includes: Repeat upsampling operation on the encoded information to obtain a time-domain signal, perform time-frequency domain conversion on the time-domain signal to obtain a frequency-domain signal, and perform frequency windowing operation on the frequency-domain signal; the first device The envelope signal is sent to the second device. Windowing the frequency domain signal in the frequency domain, that is, intercepting part of the frequency domain components, can reduce out-of-band leakage. To achieve low power consumption and low cost in signal detection.

In a third aspect, a signal processing method is provided. The method may be executed by a terminal. The method is implemented by the following steps: the terminal detects an envelope signal sent by a network device; the terminal detects that the network device sends When the envelope signal is reached, wake up according to the envelope signal. In this way, the terminal can obtain downlink scheduling information in time by detecting the envelope signal, and can reduce the transmission delay of the downlink service. At the same time, since the terminal detects the envelope signal through the amplitude, the detection consumption is relatively low, and the power consumption and cost can be further reduced.

In a possible design, the terminal may detect the amplitude according to the amplitude and determine that the detected signal has such a signal characteristic, and determine it as an envelope signal as a preliminary judgment for detecting the envelope signal.

In a possible design, the terminal controls the envelope detection circuit used for envelope detection in its own working state, and detects the envelope signal sent by the network device based on the envelope detection circuit; and keeps itself The other circuits except the envelope detection circuit are in a sleep state. In order to ensure that the terminal detects the envelope signal and wakes up, it has the characteristics of low power consumption and low cost.

In a possible design, the envelope signal includes one or more OFDM symbols, and any one of the OFDM symbols includes a continuous signal whose amplitude is lower than a threshold. In this way, the terminal can distinguish the envelope signal from the ordinary data frame according to such signal characteristics, to avoid the loss of power consumption caused by receiving the ordinary data frame.

In a possible design, the envelope signal includes the identification ID of the terminal or the group ID of the group where the terminal is located. The terminal can distinguish whether it is a signal to wake up itself according to the ID.

According to a fourth aspect, a signal processing apparatus is provided. The apparatus is applied to a first device, and the first device may be a network device or a terminal. The device has a function of implementing the method performed by the first device in the first aspect, the second aspect, any one of the possible designs in the first aspect and any one of the possible designs in the second aspect, which includes means for performing the above Means corresponding to the steps or functions described in the aspect. The steps or functions may be implemented by software, or by hardware (such as a circuit), or by a combination of hardware and software.

In a possible design, the above-mentioned signal processing device includes one or more processors and a communication unit. The one or more processors are configured to support the signal processing device to perform the functions in the above method. For example, generating an envelope signal. The communication unit is used to support the signal processing device to communicate with other devices to implement receiving and/or sending functions. For example, sending an envelope signal.

Optionally, the device may further include one or more memories, which are used to couple with the processor, which store necessary program instructions and/or data of the device. The one or more memories may be integrated with the processor, or may be provided separately from the processor. This application is not limited.

The communication unit may be a transceiver or a transceiver circuit. Optionally, the transceiver may also be an input/output circuit or an interface.

The device may also be a communication chip. The communication unit may be an input/output circuit or an interface of a communication chip.

In another possible design, the above signal processing device includes a transceiver, a processor, and a memory. The processor is used to control a transceiver or an input/output circuit to send and receive signals, the memory is used to store a computer program, and the processor is used to run the computer program in the memory so that the device performs the first aspect, the second aspect, the first aspect Any one of the possible designs and the method of any of the possible designs of the second aspect.

According to a fifth aspect, there is provided a signal processing device, which is applied to a terminal, or the device is a terminal, and the device has a method for implementing the method performed by the terminal in any of the above-mentioned third aspects and any possible design of the third aspect Functions, which include means corresponding to the steps or functions described in the above aspects. The steps or functions may be implemented by software, or by hardware (such as a circuit), or by a combination of hardware and software.

In a possible design, the above-mentioned signal processing device includes one or more processors and a communication unit. The one or more processors are configured to support the signal processing device to perform the functions in the above method. For example, detecting the envelope signal sent by the network device, and awakening according to the envelope signal. The communication unit is used to support the signal processing device to communicate with other devices to implement receiving and/or sending functions. For example, receiving an envelope signal.

In another possible design, the above signal processing device includes a transceiver, a processor, and a memory. The processor is used to control a transceiver or an input/output circuit to send and receive signals, the memory is used to store a computer program, and the processor is used to run the computer program in the memory, so that the device performs any one of the third aspect or the third aspect Possible design methods.

According to a sixth aspect, there is provided a system including a terminal and a network device, wherein the network device performs any of the possible designs of the first aspect, the second aspect, the first aspect, or any of the second aspect A method executed in the first device in a possible design; or, the terminal performs any one of the first aspect, the third aspect, any possible design of the first aspect, or any possible third aspect The method performed by the first device/terminal in the design.

In a seventh aspect, a computer-readable storage medium is provided for storing a computer program, and the computer program includes instructions for performing the methods in the above aspects.

In an eighth aspect, a computer program product is provided. The computer program product includes: computer program code, which, when the computer program code runs on a computer, causes the computer to perform the methods in the above aspects.

BRIEF DESCRIPTION

FIG. 1a is one of the schematic diagrams of the system architecture in the embodiment of the present application;

FIG. 1b is the second schematic diagram of the system architecture in the embodiment of the present application;

2a is one of the schematic flowcharts of the signal processing method in the embodiment of the present application;

2b is a second schematic flowchart of the signal processing method in the embodiment of the present application;

FIG. 3 is one of schematic flowcharts of generating an envelope signal in an embodiment of the present application;

4a is a schematic diagram of the waveform after FDSS DFT-s-OFDM in the embodiment of the present application;

4b is a schematic diagram of the waveform after circularly shifting the number of up-sampling samples corresponding to a half Pi/2-OOK modulation symbol in the embodiment of the present application;

5 is a schematic diagram of the waveform after FDSS in the embodiment of the present application;

6 is a schematic diagram of the waveform after pi/2 rotation in the embodiment of the present application;

7 is a schematic diagram of a waveform after self-time coding in an embodiment of the present application;

8 is a schematic diagram of an envelope signal in an embodiment of this application;

FIG. 9 is one of schematic flowcharts of generating an envelope signal in an embodiment of the present application;

10a is a schematic diagram of the waveform before upsampling in the embodiment of the present application;

10b is a schematic diagram of the waveform after upsampling in the embodiment of the present application;

11 is a schematic diagram of envelope signal, ideal signal and envelope-OFDM waveform in the embodiment of the present application;

12 is a first structural schematic diagram of a signal processing device in an embodiment of the present application;

13 is a second structural schematic diagram of a signal processing device in an embodiment of the present application;

14 is a third structural schematic diagram of a signal processing device in an embodiment of the present application.

detailed description

Embodiments of the present application provide a signal processing method and device to solve the problem that the current NB-IoT system cannot achieve the requirements of low power consumption and low cost in terms of signal detection. Among them, the method and the device are based on the same concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated here.

In the description of the embodiments of the present application, "and/or" describes the association relationship of the associated objects, indicating that there may be three types of relationships, for example, A and/or B, which may indicate: A exists alone, and A and B exist simultaneously. There are three cases of B. The character "/" generally indicates that the related object is a "or" relationship. At least one involved in this application refers to one or more; multiple refers to two or more. In addition, it should be understood that in the description of this application, the words "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance, nor as an indication. Or suggest the order.

The signal processing method provided in the embodiments of the present application may be applied to a fourth generation (4th generation, 4G) communication system, a fifth generation (5th generation, 5G) communication system, or various future communication systems. Optionally, the embodiments of the present application are applicable to a communication system that uses single carrier waveform communication. It is mainly used in low-power and/or low-cost scenarios, for example, in NB-IoT scenarios, and also in passive IoT scenarios.

The embodiments of the present application will be described in detail below with reference to the drawings.

FIG. 1a shows a possible communication system architecture applicable to the signal processing method provided by an embodiment of the present application. Referring to FIG. 1a, the communication system 100 includes: a network device 101 and one or more terminals 102. When the communication system 100 includes a core network, the network device 101 may also be connected to the core network. The network device 101 may communicate with the IP network 103 through the core network. For example, the IP network 103 may be: the Internet (Internet), a private IP network, or other data networks. The network device 101 provides services to the terminals 102 within the coverage. For example, referring to FIG. 1a, the network device 101 provides wireless access to one or more terminals 102 within the coverage of the network device 101. The communication system 100 may include multiple network devices, for example, network devices 101'. There may be overlapping areas in coverage between network devices, for example, there may be overlapping areas in coverage between network device 101 and network device 101'. The network devices can also communicate with each other. For example, the network device 101 can communicate with the network device 101'.

The network device 101 is a node in a radio access network (radio access network, RAN), and may also be called a base station, and may also be called a RAN node (or device). At present, some examples of network equipment 101 are: general base station (general node B, gNB), new air interface base station (new radio node B, NR-NB), transmission and reception point (transmission reception point, TRP), evolved node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base controller), BSC, base transceiver station (BTS) , A home base station (eg, home evolved NodeB, HeNB; or home Node B, HNB), baseband unit (BBU), or wireless fidelity (Wifi) access point (AP), Or 5G communication system or network side equipment in future possible communication system.

Terminal 102, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice or data connectivity to users. It can be an IoT device. For example, the terminal 102 includes a handheld device having a wireless connection function, a vehicle-mounted device, and the like. At present, the terminal 102 may be: a mobile phone (mobile phone), a tablet computer, a laptop computer, a palmtop computer, a mobile internet device (mobile internet device (MID)), a wearable device (such as a smart watch, smart bracelet, pedometer, etc.) , In-vehicle equipment (for example, cars, bicycles, electric vehicles, aircraft, ships, trains, high-speed rail, etc.), virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, industrial control (industrial control) Wireless terminals, smart home devices (for example, refrigerators, TVs, air conditioners, electric meters, etc.), smart robots, workshop equipment, wireless terminals in self-driving (self driving), wireless terminals in remote surgery (remote medical), Wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, flying equipment (for example, Intelligent robots, hot air balloons, drones, airplanes, etc.

In addition, the signal processing method provided in this application can also be applied to passive IoT scenarios. As shown in the system architecture shown in FIG. 1b, in a passive IoT scenario, in addition to the network device 101 and the terminal 102, a backscatter device (BD) 103 is also included. Both the network device 101 and the terminal 102 can communicate with the BD 103. In this application, both the network device 101 and the terminal 102 can send an envelope signal to the BD 103, and the envelope signal can be used to transmit data, for example, the envelope signal carries data information and scheduling information.

The signal processing method provided in the embodiment of the present application is applied in the Internet of Things, and more specifically in the NB-IoT, the envelope signal can be used to transmit data, for example, carrying data information and/or scheduling information, or as a kind of The wake-up signal carries scheduling information. For example, when a network device needs to dispatch a terminal, it will send an envelope signal to the terminal. The terminal side detects the envelope signal in real time. When the envelope signal is detected, it is determined that the network device will dispatch the terminal according to the envelope signal. wake.

The basic idea of the signal processing method provided in the embodiments of the present application is that the sending end generates an envelope detection signal (that is, the envelope signal), which is convenient for the receiving end to perform extremely low power consumption detection. Specifically, the sending end generates an envelope signal, and the envelope signal is used to wake up the terminal or send data to the receiving end.

The signal processing method provided by the embodiment of the present application will be described in detail below based on the system architecture shown in FIG. 1a or FIG. 1b and referring to FIG. 2a. In the method described below in this application, the execution subject is described by the first device. The first device may be a network device or a terminal. In the first application scenario, when the first device is a network device, the second device may be a terminal. In the second application scenario, when the first device is a network device, the second device is a backscattering device; or, when the first device is a terminal, the second device is a backscattering device.

S201. The first device generates an envelope signal.

Because in the new generation radio communication system (new radio), the uplink uses orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) waveform and discrete Fourier transform extended orthogonal frequency division multiplexing (DFT spread OFDM) , DFT-s-OFDM) waveform. Therefore, the waveform of the envelope signal generated by the network device can be similar to the waveform adopted by NR. For example, the envelope signal may be similar to the DFT-s-OFDM waveform used in the NR uplink. The envelope signal can also approximate other waveforms to which NR is applicable. For example, the envelope signal can also approximate the Envelope-OFDM waveform. Envelope-OFDM refers to envelope OFDM or frequency domain windowed OFDM. The envelope signal designed in this application is similar to the waveform used by NR, in order to make the envelope signal better applied in the NR system. Among them, "approximately" means that the waveform is similar to the NR waveform in appearance, and the network device and the terminal can regard the envelope signal as an NR waveform when transmitting the waveform.

The envelope signal also has the characteristics of an ordinary envelope signal, which is as close to a rectangular wave as possible on the waveform. The common envelope signal is connected at the peak point of a high-frequency signal of a period of time to form a line above (positive direction) and a line below (negative direction). The two lines in the positive and negative directions are the envelope lines. The envelope is the curve that reflects the change in the amplitude of the high-frequency signal.

The main process of generating an envelope signal by the first device is described in detail below.

The first device selects that in the process of generating the envelope signal, any one of the following operations 1 to 4 or a combination of any one of the plurality of operations 1 to 4 may be used.

1. In the process of generating the envelope signal, the first device performs zero-to-end padding operations on the encoded information.

2. In the process of generating the envelope signal, the first device adopts pi/2-binary on-off keying (OOK) modulation.

3. During the process of generating the envelope signal by the first device, for each symbol in the up-sampling time-domain signal, the number of up-sampling samples corresponding to the Pi/2-OOK modulation symbol is circularly shifted to the right by half. Among them, the up-sampling time-domain signal includes multiple up-sampling samples. For each OFDM symbol, the network device rotates right by a certain number of up-sampling samples. The number of specific samples is half a Pi/2-OOK modulation symbol. The corresponding number of samples.

4. Add a zero cyclic prefix (null CP) to each OFDM symbol.

The solution of the present application includes any one of the above operations 1 to 4 to form the protection solution of the present application.

In a possible implementation manner, as shown in FIG. 3, the first device uses a combination of the above steps to generate an envelope signal.

Specifically, the first device performs channel coding on the source information bits to be coded, and then performs self-time coding. The channel coding may be a (reed Muller, RM) coding method or a polar code (Polar) coding method. The self-timed encoding may be the Machester self-timed encoding method. The encoded information after encoding is subjected to a zero-filling operation, and pi/2-OOK modulation is performed to obtain a modulation symbol. The order of zero-padding and pi/2-OOK modulation can be interchanged. The obtained modulation symbols are converted to obtain a DFT-s-OFDM waveform. For example, the obtained modulation symbols are subjected to time-frequency domain conversion (DFT transformation), frequency windowing (frequency domain spectrometry shaping (FDSS), and inverse fast Fourier transform (IFFT), the DFT length is less than the IFFT length, It is equivalent to upsampling, and the upsampling time domain signal is obtained after these steps. One or more OFDM symbols are included in the up-sampled time-domain signal. Each OFDM symbol in one or more OFDM symbols is circularly shifted to the right by half the number of up-sampling samples corresponding to the Pi/2-OOK modulation symbol to obtain a time-domain signal. A zero-cycle prefix is added to each OFDM symbol in the time-domain signal to obtain an envelope signal. The first device sends the envelope signal to the terminal. Among them, the OFDM symbol may also be called a DFT-s-OFDM symbol. In the specific steps described above, any one of the operations 1 to 4 above is the solution that needs to be protected in this application. In addition to this, other steps similar to the conventional operation of coding or DFT-s-OFDM are optional steps and can be replaced by other similar steps.

In the following, the above-mentioned partial processing steps are used to explain the effect of waveform adjustment.

In FIGS. 4a to 11, the horizontal axis is the sampling point, and the vertical axis is the normalized value. In Figures 4a to 8 and 11, the rectangular wave is the ideal waveform of a general envelope signal, which can be called the waveform of the ideal signal.

1) Cyclically shift the up-sampling time-domain signal to the right by half the number of up-sampling samples corresponding to Pi/2-OOK modulation symbols.

As shown in Figure 4a, it is an up-sampled time-domain signal. DFT/IFFT is equivalent to sinc cyclic filtering. It needs to cyclically shift the number of upsampling samples corresponding to half a Pi/2-OOK modulation symbol before the envelope can correspond to the waveform of the ideal signal, making the envelope clearer.

After circularly shifting the number of up-sampling samples corresponding to half a Pi/2-OOK modulation symbol right, the waveform shown in FIG. 4b is obtained. It can be seen from Figure 4b that the envelope corresponds to the waveform of the ideal signal.

2) As shown in Figure 5, FDSS helps the envelope signal to have a better match with the ideal signal waveform, making the envelope clearer. The amplitude of the part of the envelope signal circled by the dotted circle in FIG. 5 is smaller, corresponding to the part where the ideal signal is 0, and it can be seen that it has a better fit.

3) As shown in Fig. 6, pi/2-OOK modulation is adopted to make the envelope signal continuously have a high amplitude part of 1, the pits are smaller, and it is less likely that the wrong judgment will be 0, making the envelope signal more Clear. As shown in FIG. 6, part of the envelope signal circled by a dotted circle has two consecutive high amplitude values of 1, and the pit in the middle of the two consecutive high amplitude values becomes smaller to avoid misjudgment if the pit is too large.

4) As shown in FIG. 7, with self-timed encoding, such as Manchester encoding, the generated envelope signal appears at most two consecutive high amplitude values of 1, making the envelope signal less fluctuating.

5) As shown in FIG. 8, the zero-cyclic prefix and the first and the last zero-filling operations can be used to make a small amplitude signal appear before and after each symbol for a period of time. For a single carrier such as DFT-s-OFDM, a broadband signal means that it fluctuates faster and transmits more signals at the same time, so it is difficult for a broadband signal to always have a small amplitude at the same time. Through the zero cyclic prefix and the first and the last zero-filling operation, the obtained envelope signal is distinguished from the data frame of the ordinary DFT-s-OFDM waveform.

In another application scenario, the present application can be further described by an envelope signal close to the envelope-OFDM waveform. In this way, the first device may select any one of the following operations (1) to (3) or a combination of any of the multiple operations in (1) to (3) during the process of generating the envelope signal.

(1) In the process of generating the envelope signal, the first device repeats the upsampling operation on the encoded information.

(2) In the process of generating the envelope signal, the first device performs time-frequency domain conversion (DFT transformation) on the time-domain signal.

(3) In the process of generating the envelope signal, the first device performs frequency windowing on the frequency domain signal.

The scheme of the present application includes any one of the operations (1) to (3) above to form the protection scheme of the present application.

In a possible implementation manner, as shown in FIG. 9, the network device uses a combination of the above steps (1) to (3) to generate an envelope signal.

Specifically, the first device performs channel coding on the source information bits to be coded, and then performs self-time coding. The channel coding may be a (reed Muller, RM) coding method or a polar code (Polar) coding method. The self-timed encoding may be the Machester self-timed encoding method. The encoded information is subjected to zero-to-end padding operation and repeated upsampling operation to obtain a time-domain signal. Perform time-frequency domain conversion (DFT transform) on the time-domain signal to obtain the frequency-domain signal. Windowing the frequency domain signal in the frequency domain, that is, intercepting part of the frequency domain components, can reduce out-of-band leakage. The part of the intercepted frequency domain component is then subjected to IFFT to transform to the time domain, and a zero-cycle prefix is added to the time domain signal to obtain an envelope signal. Figure 10a is the waveform before upsampling, and Figure 10b is the waveform after upsampling.

In the specific steps described above, any one of the operations in (1) to (3) above is the solution that needs protection in this application. In addition to this, other steps similar to the conventional operation of coding or DFT-s-OFDM are optional steps and can be replaced by other similar steps.

FIG. 11 shows how well the envelope signal obtained in another application scenario described above matches the ideal signal and the envelope-OFDM waveform. The envelope signal processing method obtained in this way is relatively simple, while keeping the envelope clear while reducing out-of-band leakage.

S202. The first device sends the envelope signal to the second device.

In the above first application scenario, the envelope signal can be used to wake up the terminal.

In a possible implementation, the network device may send an envelope signal to the terminal when it needs to schedule the terminal. Since the waveform of the envelope signal is compatible with the NR waveform, and the energy consumption of transmitting the envelope signal is low, this helps to save the resources and power consumption of the network equipment. The network device can wake up the terminal through the envelope signal to facilitate timely scheduling of the terminal.

In another possible implementation manner, when there is downlink data to be sent to the terminal, the network device may first send an envelope signal to the terminal to wake up the terminal. Among them, the downlink data can be the downlink data of the real-time service, of course, it can also be the downlink data of the non-real-time service, which helps to ensure the timeliness of the downlink data transmission, improve the terminal's experience of using the real-time service, and meet the downlink data delay requirements Higher business.

Optionally, the network device may carry information used to identify the terminal in the envelope signal sent. For example, if the network device adopts a unicast mode, the network device may carry the identity (ID) of the terminal in the envelope signal, and the identity of the terminal may be any existing type of identity. For another example, if the network device adopts the multicast method, the network device may carry the group ID of the group where the terminal is located in the envelope signal. In addition, the envelope signal can also carry scheduling information. For example, the scheduling information may include information about how long the interval will be before the packet is sent to the terminal, or a notification of a system message change.

In the second application scenario, the envelope signal can be used for data transmission, for example, the envelope signal carries data information and/or scheduling information, the backscattering device receives the envelope signal sent by the first device, and generates a reflection signal according to the envelope signal And send the reflected signal to the receiver. Since the power consumption of detecting the envelope signal is extremely low, the backscattering device can achieve low power consumption and low cost in the process of generating and transmitting the reflected signal.

In the first application scenario, as shown in FIG. 2b, the method provided in this application further includes S203 to S204.

S203. The terminal detects the envelope signal sent by the network device.

The terminal can distinguish the envelope signal from the ordinary data frame according to the signal characteristics of the envelope signal. For example, the terminal may determine the detected signal as an envelope signal based on the amplitude detection and determine that the detected signal has such a signal characteristic as a preliminary judgment for detecting the envelope signal.

Specifically, since the envelope signal includes one or more OFDM symbols, any OFDM symbol has a continuous signal whose amplitude is lower than a threshold at the beginning and the end. The threshold can be set according to an empirical value, and a continuous signal below the threshold corresponds to an ideal signal Part of 0. The terminal determines the signal to wake up itself according to the ID and other information contained in the envelope signal, and then obtains scheduling information from the envelope signal. Furthermore, the terminal wakes itself up according to the detected envelope signal.

Exemplarily, when the terminal detects the envelope signal, it can control the envelope signal detection circuit for detecting the envelope signal to be out of work, and control most other circuits to be in a sleep state to ensure that the terminal detects the envelope signal to wake up The process has the characteristics of low power consumption and low cost. After the terminal wakes up, it may be in an inactive or ideal state, and may also receive downlink data sent by the network device. In this way, the terminal can obtain downlink scheduling information in time by detecting the envelope signal, which can reduce the transmission delay of the downlink service. At the same time, since the terminal detects the envelope signal through the amplitude, the detection consumption is relatively low, and the power consumption and cost can be further reduced.

During the specific detection of the envelope signal by the terminal, since the OFDM symbols in the envelope signal are processed by zero-padded and zero-cycle prefix, each symbol will show a small amplitude signal before and after a period of time. In this case, the terminal It is possible to detect the amplitude of any OFDM symbol in the envelope signal, and when it is determined that a continuous small amplitude of the signal is detected, it can be determined as the envelope signal as a preliminary judgment of the envelope signal. Specifically, if the envelope signal includes one or more OFDM symbols, and any OFDM symbol has a continuous signal whose amplitude is lower than a threshold at the beginning and the end, it can be regarded as an envelope signal. The threshold can be set according to the empirical value, and the continuous signal below the threshold corresponds to the 0 part of the ideal signal. The terminal determines to schedule its own signal according to the ID and other information contained in the envelope signal. Then obtain scheduling information from the envelope signal.

S204. When detecting the envelope signal sent by the network device, the terminal wakes up the terminal according to the envelope signal.

Once the terminal detects the envelope signal, it needs to analyze the envelope signal, and determine whether to schedule its own signal according to the analysis result. For example, it is determined whether the envelope signal contains its own identifier, and if it is included, it is determined that the envelope signal is sent by the network device to the terminal. The terminal obtains scheduling information from the envelope signal.

Therefore, in this application, the detection of the envelope signal by the terminal can only detect the signal by the amplitude, which helps to save power and power. It can not only perform real-time detection, respond to downlink services in time, but also consume low power, which can achieve Low power consumption and low cost.

In summary, the network device can send an envelope signal to the terminal when the terminal needs to be scheduled or when there is downlink data to be sent. The waveform of the envelope signal is compatible with the NR waveform, and the energy consumption of sending the envelope signal is low, which helps to save the resources and power consumption of network equipment. The network device can wake up the terminal through the envelope signal, so that the terminal can be scheduled in time, which helps to ensure the timeliness of the downlink data transmission and meet the requirements of the downlink data delay service. When the terminal detects the envelope signal, in addition to the operation of the envelope detection circuit, most other circuits can be in a sleep state to ensure low power consumption and low cost. After the terminal wakes up, it may be in an inactive or ideal state. It can also receive downlink data sent by network devices. In this way, the terminal can obtain downlink scheduling information in time by detecting the envelope signal to reduce the transmission delay of the downlink service. At the same time, because the terminal detects the envelope signal through the amplitude, the detection power consumption is extremely low, and the power consumption and cost can be reduced.

Based on the same concept, as shown in FIG. 12, an embodiment of the present application further provides a signal processing device 1200, which can be applied to the communication system shown in FIG. 1a or FIG. 1b, and executes the above method embodiment The function of the first device. The signal processing device 1200 includes a processing unit 1201 and a transmission unit 1202.

The processing unit 1201 is configured to generate an envelope signal.

The process of generating the envelope signal by the processing unit 1201 includes any one or any combination of the following: performing zero-to-end padding operation on the encoded information; using pi/2-binary on-off keying OOK modulation; for up-sampling time-domain signals Each orthogonal frequency-division multiplexed OFDM symbol in the cyclic shifts the number of up-sampling samples corresponding to half a Pi/2-OOK modulation symbol to the right, where the up-sampling time-domain signal includes one or more OFDM symbols; or Each OFDM symbol is added with a zero cyclic prefix.

Alternatively, the process of generating the envelope signal by the processing unit 1201 includes: repeatedly upsampling the encoded information to obtain a time-domain signal, performing time-frequency domain conversion on the time-domain signal, obtaining a frequency-domain signal, and converting the frequency-domain signal Perform frequency windowing operation.

The sending unit 1202 is configured to send the envelope signal to the second device.

The units of the signal processing device 1200 are also used to perform other operations performed by the first device in the foregoing method embodiments, and the repetition is not repeated.

Based on the same concept, as shown in FIG. 13, an embodiment of the present application further provides a signal processing device 1300, which can be applied to the communication system shown in FIG. 1a or FIG. 1b. The function of the terminal. The signal processing device 1300 includes a detection unit 1301 and a wake-up unit 1302.

The detection unit 1301 is configured to detect the envelope signal sent by the network device.

The wake-up unit 1302 is configured to wake up according to the envelope signal when the detection unit 1301 detects the envelope signal sent by the network device.

The units of the signal processing device 1300 are also used to perform other operations performed by the terminal in the foregoing method embodiments, and the repetition is not repeated.

Based on the same inventive concept as the above communication method, as shown in FIG. 14, an embodiment of the present application further provides a signal processing device 1400, which includes a transceiver 1401, a processor 1402, and a memory 1403. The memory 1403 is optional. The memory 1403 is used to store programs executed by the processor 1402. When the signal processing apparatus 1400 is used to implement the operation performed by the first device in the above method embodiment, the processor 1402 is used to call a group of programs, and when the program is executed, the processor 1402 is caused to execute the first method in the above method embodiment The operation performed by the device. The function module sending unit 1202 in FIG. 12 may be implemented by the transceiver 1401, and the processing unit 1201 may be implemented by the processor 1402. When the signal processing device 1400 is used to implement the operation performed by the terminal in the above method embodiment, the processor 1402 is used to call a set of programs, and when the program is executed, the processor 1402 is caused to perform the operation performed by the terminal in the above method embodiment . The function module detection unit 1301 and the wake-up unit 1302 in FIG. 13 may be implemented by the processor 1402.

The processor 1402 may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP.

The processor 1402 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The above PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field programmable logic gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL), or any combination thereof.

The memory 1403 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory 1403 may also include non-volatile memory (non-volatile memory), such as flash memory (flash) memory), hard disk drive (HDD) or solid-state drive (SSD); the memory 1403 may also include a combination of the aforementioned types of memory.

In the signal processing method provided by the above embodiments of the present application, part or all of the operations and functions performed by the first device and the terminal described may be implemented by a chip or an integrated circuit.

In order to realize the functions of the device described in FIG. 12, FIG. 13 or FIG. 14, an embodiment of the present application further provides a chip, including a processor, for supporting the signal processing device 1200, the signal processing device 1300, and the signal processing device 1400 implements the functions involved in the terminal and the first device in the method provided in the foregoing embodiment. In a possible design, the chip is connected to a memory or the chip includes a memory, which is used to store necessary program instructions and data of the device.

An embodiment of the present application provides a computer storage medium that stores a computer program, and the computer program includes instructions for executing the signal processing method provided by the foregoing embodiment.

An embodiment of the present application provides a computer program product containing instructions, which, when it runs on a computer, causes the computer to execute the signal processing method provided by the foregoing embodiment.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

This application is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each flow and/or block in the flowchart and/or block diagram and a combination of the flow and/or block in the flowchart and/or block diagram may be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processing machine, or other programmable data processing device to produce a machine that enables the generation of instructions executed by the processor of the computer or other programmable data processing device A device for realizing the functions specified in one block or multiple blocks of one flow or multiple flows of a flowchart and/or one block or multiple blocks of a block diagram.

These computer program instructions may also be stored in a computer readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, the instructions The device implements the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device The instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. In this way, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A signal processing method, which includes:

The first device generates an envelope signal, wherein the process of generating the envelope signal includes any one or a combination of any of the following: performing zero-to-end padding operations on the encoded information; using pi/2-binary on-off keying OOK Modulation; for each orthogonal frequency division multiplexing OFDM symbol in the upsampled time domain signal, the number of upsampling samples corresponding to the Pi/2-OOK modulation symbol is circularly shifted right by half, where the upsampled time domain signal includes One or more OFDM symbols; or add a zero cyclic prefix to each OFDM symbol;

The first device sends the envelope signal to a second device.
The method of claim 1, wherein the first device is a network device, the second device is a terminal, and the envelope signal is used to wake up the terminal.
The method of claim 1, wherein the first device is a network device, the second device is a backscattering device, and the envelope signal is used to carry data; or,

The first device is a terminal, the second device is a backscattering device, and the envelope signal is used to carry data.
The method according to any one of claims 1 to 3, wherein the envelope signal includes an identification ID of the second device or a group ID of the group where the second device is located.
A signal processing method, which includes:

The first device generates an envelope signal, wherein the process of generating the envelope signal includes: repeatedly upsampling the encoded information to obtain a time domain signal, and performing time-frequency domain conversion on the time domain signal to obtain a frequency domain signal , Frequency windowing the frequency domain signal;

The first device sends the envelope signal to a second device.
The method of claim 5, wherein the first device is a network device, the second device is a terminal, and the envelope signal is used to wake up the terminal.
The method according to claim 5, wherein the first device is a network device, the second device is a backscattering device, and the envelope signal is used to carry data; or,

The first device is a terminal, the second device is a backscattering device, and the envelope signal is used to carry data.
The method according to any one of claims 5 to 7, wherein the envelope signal includes an identification ID of the second device or a group ID of the group where the second device is located.
A signal processing method, which includes:

The terminal detects the envelope signal sent by the network equipment;

When detecting the envelope signal sent by the network device, the terminal wakes up according to the envelope signal.
The method according to claim 9, wherein the terminal detecting the envelope signal sent by the network device includes:

The terminal controls the envelope detection circuit for envelope detection in itself to be in an operating state, and detects the envelope signal sent by the network device based on the envelope detection circuit; and keeps the envelope detection removed from itself Other circuits than the circuit are in a sleep state.
The method according to claim 9, wherein the envelope signal includes one or more OFDM symbols, and any one of the OFDM symbols includes a continuous signal whose amplitude is lower than a threshold.
A signal processing device, applied to a first device, is characterized by comprising:

A processing unit for generating an envelope signal, wherein the process of generating an envelope signal by the processing unit includes any one or a combination of any of the following: performing zero-to-end padding operation on the encoded information; using pi/2-binary start Closed-key OOK modulation; for each orthogonal frequency division multiplexed OFDM symbol in the up-sampled time-domain signal, the number of up-sampling samples corresponding to a Pi/2-OOK modulation symbol is cyclically shifted right by half, where The time domain signal includes one or more OFDM symbols; or add a zero cyclic prefix to each OFDM symbol;

The sending unit is configured to send the envelope signal to the second device.
The device according to claim 12, wherein the signal processing device is a network device, the second device is a terminal, and the envelope signal is used to wake up the terminal.
The device of claim 12, wherein the signal processing device is a network device, the second device is a backscattering device, and the envelope signal is used to carry data; or,

The signal processing device is a terminal, the second device is a backscatter device, and the envelope signal is used to carry data.
The apparatus according to any one of claims 12 to 14, wherein the envelope signal includes an identification ID of the second device or a group ID of the group where the second device is located.
A signal processing device, applied to a first device, is characterized by comprising:

A processing unit, configured to generate an envelope signal, wherein the process of generating the envelope signal by the processing unit includes: repeatedly upsampling the encoded information to obtain a time-domain signal, and performing time-frequency domain conversion on the time-domain signal, Obtaining a frequency domain signal, and performing frequency windowing on the frequency domain signal;

The sending unit is configured to send the envelope signal to the second device.
The device of claim 16, wherein the signal processing device is a network device, the second device is a terminal, and the envelope signal is used to wake up the terminal.
The device of claim 16, wherein the signal processing device is a network device, the second device is a backscattering device, and the envelope signal is used to carry data; or,

The signal processing device is a terminal, the second device is a backscatter device, and the envelope signal is used to carry data.
The apparatus according to any one of claims 16 to 18, wherein the envelope signal includes an identification ID of the second device or a group ID of the group where the second device is located.
A signal processing device, characterized in that it includes:

The detection unit is used to detect the envelope signal sent by the network device;

The wake-up unit is configured to wake up according to the envelope signal when the detection unit detects the envelope signal sent by the network device.
The apparatus according to claim 20, wherein the detection unit is configured to:

Based on controlling the envelope detection circuit for envelope detection in its own working state, and detecting the envelope signal sent by the network device based on the envelope detection circuit; and keeping itself apart from the envelope detection circuit The other circuits are in sleep state.
The apparatus according to claim 20, wherein the envelope signal includes one or more OFDM symbols, and any one of the OFDM symbols includes a continuous signal whose amplitude is lower than a threshold.
The device according to any one of claims 20 to 22, wherein the envelope signal includes an identification ID of the terminal or a group ID of the group where the terminal is located.
A signal processing device, characterized in that it includes:

Memory for storing programs;

A processor is used to execute the program stored in the memory, and when the program is executed, the processor is used to execute the method according to any one of claims 1 to 8.
The device of claim 24, wherein the transmission device of the reference signal is a chip or an integrated circuit.
A signal processing device, characterized in that it includes:

Memory for storing programs;

A processor is used to execute the program stored in the memory, and when the program is executed, the processor is used to execute the method according to any one of claims 9 to 11.
The device of claim 26, wherein the transmission device of the reference signal is a chip or an integrated circuit.
A computer-readable storage medium, characterized in that computer-readable instructions are stored in the computer storage medium, and when the computer reads and executes the computer-readable instructions, the computer is allowed to execute any one of claims 1-11 Item.
A computer program product, characterized in that, when the computer reads and executes the computer program product, the computer is caused to execute the method according to any one of claims 1-11.