CN115643147B

CN115643147B - NB-IoT multi-carrier signal synchronization method, device and electronic equipment

Info

Publication number: CN115643147B
Application number: CN202211670792.4A
Authority: CN
Inventors: 敖惠波
Original assignee: Weizhun Beijing Electronic Technology Co ltd
Current assignee: Weizhun Beijing Electronic Technology Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-03-14
Anticipated expiration: 2042-12-26
Also published as: CN115643147A

Abstract

The disclosure relates to the technical field of signal transmission, and provides an NB-IoT multi-carrier signal synchronization method, an NB-IoT multi-carrier signal synchronization device and electronic equipment, wherein the NB-IoT multi-carrier signal synchronization method comprises the following steps: acquiring a section of data to be processed based on a narrow-band physical uplink shared channel, and performing half-band rotation on the whole data to be processed; respectively adding preset frequency offsets to the data after the half-band rotation to obtain a plurality of groups of data; based on the reference symbols, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results; and selecting a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and performing synchronous operation on the data to be processed. The method can realize the direct synchronous demodulation of the channel signals of the narrow-band physical uplink shared channel without depending on other channels, has a larger search window of synchronous processing, and can carry out the synchronous processing on the signals of the narrow-band physical uplink shared channel at any section of the initial position.

Description

NB-IoT multi-carrier signal synchronization method, device and electronic equipment

Technical Field

The present disclosure relates to the field of signal transmission technologies, and in particular, to an NB-IoT multicarrier signal synchronization method, apparatus, and electronic device.

Background

NB-IoT (English is called as Narrowband Internet of Things) is short for narrow-frequency Internet of Things, and NB-IoT is a cellular network connection technology specially made for the interconnection of everything. The system has the characteristics of narrow occupied bandwidth, wide coverage, multiple connections, high speed, low cost, low power consumption, excellent architecture and the like, so that the system is widely applied to the fields of buildings, logistics, public utilities, smart cities, consumer electronics, equipment management and the like.

In the network architecture of NB-IoT, the NB-IoT terminal is often a data collecting terminal for collecting or generating various data and uploading the data to the NB-IoT base station in a network connection manner. The NB-IoT terminal uploads data, which is also called as uplink data transmission, and there are two transmission modes for NB-IoT uplink data transmission: single carrier transmission (Singleton) and multi-carrier transmission (Multitone). For multicarrier transmission, in the prior art, an NB-IoT terminal generally performs signal synchronization processing according to a downlink primary synchronization signal, which depends on other channels and has a small search window for synchronization processing, so that synchronization processing can only be performed with a cyclic prefix of a signal as a starting position. Therefore, the existing NB-IoT terminal needs to improve the signal synchronization method for transmitting uplink data in the multi-carrier transmission manner.

Disclosure of Invention

Based on the above purpose, the present disclosure provides an NB-IoT multicarrier signal synchronization method, apparatus, and electronic device, so as to solve the problem that the existing NB-IoT terminal needs to rely on another signal when transmitting uplink data in a multicarrier transmission manner, and has a small search window, and can only perform synchronization processing with a cyclic prefix of the signal as an initial position.

According to a first aspect of embodiments of the present disclosure, there is provided an NB-IoT multicarrier signal synchronization method, comprising: acquiring a section of data to be processed based on a narrow-band physical uplink shared channel, and performing half-band rotation on the whole data to be processed; respectively adding preset frequency offsets to the data after the half-band rotation to obtain a plurality of groups of data; based on the reference symbols, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results; and selecting a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and performing synchronous operation on the data to be processed.

According to a second aspect of embodiments of the present disclosure, there is provided an NB-IoT multicarrier signal synchronization apparatus comprising: the acquisition module is configured to acquire a section of data to be processed based on a narrowband physical uplink shared channel; the rotation module is configured to perform half-band rotation on the whole data to be processed; the frequency offset module is configured to add preset frequency offsets to the data subjected to the half-band rotation respectively to obtain a plurality of groups of data; the sliding module is configured to perform time domain sliding correlation operation on the multiple groups of data based on the reference symbols to obtain different correlation peak results; and the synchronization module is configured to select a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and perform synchronization operation on the data to be processed.

In a third aspect of the disclosed embodiments, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor when executing the computer program implements the steps of the NB-IoT multicarrier signal synchronization method described above.

Compared with the prior art, the beneficial effects of the disclosed embodiment are as follows: acquiring a section of data to be processed through a narrow-band physical uplink shared channel, and performing half-band rotation on the whole data to be processed; respectively adding preset frequency offsets to the data after the half-band rotation to obtain a plurality of groups of data; based on the reference symbols, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results; and selecting a group of data with the largest correlation peak as a timing position and coarse frequency offset estimation result, and performing synchronous operation on the data to be processed, so that channel signals of the narrowband physical uplink shared channel are directly synchronously demodulated without depending on other channels, a search window of synchronous processing is large, and signals of the narrowband physical uplink shared channel at any section of initial position can be synchronously processed.

Drawings

To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive efforts.

FIG. 1 is a scenario diagram of an application scenario of an embodiment of the present disclosure;

fig. 2 is a flowchart of an NB-IoT multicarrier signal synchronization method provided by an embodiment of the present disclosure;

fig. 3 is a block diagram of an NB-IoT multicarrier signal synchronization apparatus provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.

An NB-IoT multicarrier signal synchronization method and apparatus according to embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a scene schematic diagram of an application scenario according to an embodiment of the present disclosure. The application scenario may include the network terminal device 1 and the base station 2, and the network terminal device 1 and the base station 2 perform data transmission through a narrowband internet of things. Specifically, the network terminal device 1 may adopt a single carrier transmission scheme or a multi-carrier transmission scheme for transmitting the uplink data to the base station. In this embodiment, the network terminal device 1 preferably transmits uplink data by using a multicarrier transmission scheme.

The network terminal equipment 1 supports a cellular mobile communication function, can access an IoT core network based on NB-IoT technology, and performs data communication with an upper computer or a server. For example, the network terminal device 1 includes, but is not limited to, a mobile phone, a computer, a smart water meter, a smart electric meter, a smart monitor, smart furniture, smart wearing, and the like.

The base station 2 corresponds to an access point of an NB-IoT network, and when the network terminal 1 accesses the base station 2, the NB-IoT defines two physical channels for the network terminal 1 to transmit data uplink to the base station: NPUSCH (narrowband physical uplink shared channel) and NPRACH (narrowband physical random access channel). In this embodiment, NPUSCH is used to transmit uplink data, and NPUSCH transmission is preferably multi-frequency transmission.

In addition, the NPUSCH uplink subcarrier spacing is 3.75kHz and 15kHz, wherein the subcarrier bandwidth of single carrier transmission includes 3.75kHz and 15kHz, and the subcarrier spacing of multicarrier transmission is 15kHz, which supports transmission of 3, 6 and 12 subcarriers.

It should be noted that the specific types, the number, and the transmission modes of the network terminal device 1 and the base station 2 may be adjusted according to the actual requirements of the application scenarios, which is not limited in the embodiment of the present disclosure.

Fig. 2 is a flowchart illustrating an NB-IoT multicarrier signal synchronization method according to an embodiment of the present disclosure. The flowchart of the NB-IoT multicarrier signal synchronization method in fig. 2 may be performed by the base station of fig. 1. As shown in fig. 2, the NB-IoT multicarrier signal synchronization method includes:

s201, acquiring a section of data to be processed based on a narrow-band physical uplink shared channel, and performing half-band rotation on the whole data to be processed;

s202, respectively adding preset frequency offsets to the data after the half-band rotation to obtain multiple groups of data;

s203, based on the reference symbol, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results;

s204, selecting a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and performing synchronous operation on the data to be processed.

Specifically, the data to be processed is a modulation signal, and in this embodiment, the data to be processed is preferably an OFDM modulation signal. For multicarrier transmission, the subcarrier spacing is 15kHz, and the uplink contains 12 consecutive subcarriers. For the data channel modulated by OFDM, under the same bandwidth, the smaller the subcarrier spacing, the larger the coherent bandwidth, the better the anti-multipath interference effect of data transmission, and the higher the data transmission efficiency.

In this embodiment, a section of data to be processed is data of 2ms or longer, synchronization and other processing can be generally completed through the section of data, and the specific data length and configuration are related, which is not limited in this disclosure.

Referring to fig. 1, for uplink multi-carrier signal synchronization between the network terminal device 1 and the base station 2, the network terminal device 1 corresponds to a signal transmitting end, and the base station corresponds to a signal receiving end. Because two independent physical devices are adopted, frequency deviation inevitably exists, and the frequency deviation can cause rotation on the phase of modulation data, so that the frequency deviation must be corrected at a receiving end to realize signal synchronization. For example, taking OFDM modulated signals as an example, the prior art generally uses repeated cyclic prefixes to solve the frequency offset, which can only perform synchronization processing on a specified starting position of received data due to a small search window and needs to rely on other channels.

In step S201 of the method shown in fig. 1, performing half-band rotation on the whole data to be processed includes: and carrying out frequency offset compensation of-7.5 kHz on the whole data to be processed.

Next, in step S202 of the method shown in fig. 1, preset frequency offsets are added to the data after the half-band rotation, respectively, so as to obtain multiple sets of data. The predetermined frequency offset includes-7 kHz to 7kHz. For example, in the range from-7 kHz to 7kHz, a plurality of preset frequency offsets with different sizes or a plurality of preset frequency offsets with the same size may be added to the data after half-band rotation, so as to obtain a plurality of sets of data after frequency offset.

Preferably, the preset frequency offset added to the data after half-band rotation is equal to the frequency of one or half of the sub-carrier, or an integer multiple of the frequency of the sub-carrier. The phase rotation caused by different frequency offsets is obtained by adding preset frequency offsets with different sizes to the data after the half-band rotation, so that the search window of synchronous processing is larger, and the NPUSCH signal at any section of initial position can be synchronously processed.

Next, in step S203 of the method shown in fig. 1, performing a time-domain sliding correlation operation on the multiple sets of data includes: and carrying out frequency domain convolution processing on the multiple groups of data so as to obtain the signal correlation of each group of data. Here, the frequency domain convolution processing is an optimization operation of the time domain sliding correlation processing, and the processing amount can be reduced under the same effect.

Finally, in step S204 of the method shown in fig. 1, performing a time-domain sliding correlation operation on the multiple sets of data includes: and acquiring channel impulse responses of multiple groups of data, and then selecting the group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result. By the NB-IoT multi-carrier signal synchronization method, NPUSCH channel signals can be directly synchronously demodulated without depending on other channels, so that the synchronization processing process of the NB-IoT multi-carrier signals is simplified.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure.

The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods. For details not disclosed in the embodiments of the apparatus of the present disclosure, refer to the embodiments of the method of the present disclosure.

Fig. 3 is a schematic diagram of an NB-IoT multicarrier signal synchronization apparatus provided in an embodiment of the present disclosure. As shown in fig. 3, the NB-IoT multicarrier signal synchronizing apparatus comprises:

an obtaining module 301, configured to obtain a segment of data to be processed based on a narrowband physical uplink shared channel;

a rotation module 302 configured to perform half-band rotation on the whole data to be processed;

a frequency offset module 303 configured to add preset frequency offsets to the data after the half-band rotation, respectively, to obtain multiple groups of data;

a sliding module 304 configured to perform a time domain sliding correlation operation on the multiple groups of data based on the reference symbol to obtain different correlation peak results;

the synchronization module 305 is configured to select a group of data with the largest correlation peak as a timing position and a coarse frequency offset estimation result, and perform a synchronization operation on the data to be processed.

According to the technical scheme provided by the embodiment of the disclosure, a section of data to be processed is obtained through a narrow-band physical uplink shared channel, and the whole data to be processed is subjected to half-band rotation; respectively adding preset frequency offsets to the data after the half-band rotation to obtain a plurality of groups of data; based on the reference symbols, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results; and selecting a group of data with the largest correlation peak as a timing position and coarse frequency offset estimation result, and performing synchronous operation on the data to be processed, so that channel signals of the narrowband physical uplink shared channel are directly synchronously demodulated without depending on other channels, a search window of synchronous processing is large, and signals of the narrowband physical uplink shared channel at any section of initial position can be synchronously processed.

In some embodiments, the rotation module 302 of FIG. 3 is used to compensate the processed data for a-7.5 kHz frequency offset.

In some embodiments, the predetermined frequency offset comprises-7 kHz to 7kHz.

In some embodiments, the sliding module 304 in fig. 3 is configured to perform frequency-domain convolution on the multiple sets of data and obtain channel impulse responses of the frequency-domain convolved multiple sets of data.

All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.

Fig. 4 is a schematic diagram of an electronic device 4 provided by the embodiment of the present disclosure. As shown in fig. 4, the electronic apparatus 4 of this embodiment includes: a processor 401, a memory 402, and a computer program 403 stored in the memory 402 and operable on the processor 401. The steps in the various method embodiments described above are implemented when the processor 401 executes the computer program 403. Alternatively, the processor 401 implements the functions of the respective modules in the above-described respective apparatus embodiments when executing the computer program 403.

The electronic device 4 may be a desktop computer, a notebook, a palm computer, a cloud server, or other electronic devices. The electronic device 4 may include, but is not limited to, a processor 401 and a memory 402. Those skilled in the art will appreciate that fig. 4 is merely an example of electronic device 4 and does not constitute a limitation of electronic device 4 and may include more or fewer components than shown, or different components.

The Processor 401 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like.

The storage 402 may be an internal storage unit of the electronic device 4, for example, a hard disk or a memory of the electronic device 4. The memory 402 may also be an external storage device of the electronic device 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the electronic device 4. The memory 402 may also include both internal storage units and external storage devices of the electronic device 4. The memory 402 is used for storing computer programs and other programs and data required by the electronic device.

It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely illustrated, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. Each functional module in the embodiments may be integrated in one processing unit, or each module may exist alone physically, or two or more modules are integrated in one processing unit, and the integrated modules may be implemented in a form of hardware, or in a form of software functional modules.

The integrated module, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiment shown in fig. 2 described above can be realized by the present disclosure, and can also be realized by a computer program which is stored in a computer readable storage medium and can realize the steps of the method embodiments in fig. 2 described above when the computer program is executed by a processor. The computer program may comprise computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, software distribution medium, etc.

The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present disclosure, and are intended to be included within the scope of the present disclosure.

Claims

1. An NB-IoT multicarrier signal synchronization method comprising:

acquiring a section of data to be processed based on a narrow-band physical uplink shared channel, and performing half-band rotation on the whole data to be processed;

respectively adding preset frequency offsets to the data after the half-band rotation to obtain a plurality of groups of data;

based on the reference symbols, performing time domain sliding correlation operation on the multiple groups of data to obtain different correlation peak results;

selecting a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and carrying out synchronous operation on the data to be processed;

the integral half-band rotation of the data to be processed comprises the following steps: and carrying out frequency offset compensation of-7.5 kHz on the whole data to be processed.

2. The NB-IoT multicarrier signal synchronization method according to claim 1, wherein the predetermined frequency offset comprises-7 kHz to 7kHz.

3. The NB-IoT multicarrier signal synchronization method according to claim 1 or 2, wherein performing time-domain sliding correlation on the plurality of groups of data comprises: and carrying out frequency domain convolution processing on the multiple groups of data.

4. The NB-IoT multicarrier signal synchronization method according to claim 3, further comprising, after performing frequency-domain convolution processing on the plurality of sets of data: and acquiring channel impulse responses of the multiple groups of data.

5. An NB-IoT multicarrier signal synchronization apparatus, comprising:

the acquisition module is configured to acquire a section of data to be processed based on a narrowband physical uplink shared channel;

the rotation module is configured to perform half-band rotation on the whole data to be processed, and the half-band rotation on the whole data to be processed comprises the following steps: carrying out frequency offset compensation of-7.5 kHz on the whole data to be processed;

the frequency offset module is configured to add preset frequency offsets to the data after the half-band rotation respectively to obtain a plurality of groups of data;

the sliding module is configured to perform time domain sliding correlation operation on the multiple groups of data based on the reference symbols to obtain different correlation peak results;

and the synchronization module is configured to select a group of data with the maximum correlation peak as a timing position and coarse frequency offset estimation result, and perform synchronization operation on the data to be processed.

6. The NB-IoT multicarrier signal synchronization apparatus of claim 5, wherein the preset frequency offset comprises-7 kHz to 7kHz.

7. The NB-IoT multi-carrier signal synchronization apparatus of claim 6, wherein the sliding module is configured to perform frequency-domain convolution on the multiple sets of data and obtain channel impulse responses of the multiple sets of data after the frequency-domain convolution.

8. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 4 when executing the computer program.