WO2020223921A1 - 一种信号处理方法、相关设备及LoRa无线*** - Google Patents

一种信号处理方法、相关设备及LoRa无线*** Download PDF

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Publication number
WO2020223921A1
WO2020223921A1 PCT/CN2019/085975 CN2019085975W WO2020223921A1 WO 2020223921 A1 WO2020223921 A1 WO 2020223921A1 CN 2019085975 W CN2019085975 W CN 2019085975W WO 2020223921 A1 WO2020223921 A1 WO 2020223921A1
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signal
spread spectrum
preset
scrambling code
sending device
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PCT/CN2019/085975
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English (en)
French (fr)
Inventor
于洋
孙鹏飞
刘晓龙
张建功
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哈尔滨海能达科技有限公司
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Priority to PCT/CN2019/085975 priority Critical patent/WO2020223921A1/zh
Publication of WO2020223921A1 publication Critical patent/WO2020223921A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Definitions

  • the present invention relates to the field of wireless communication technology, in particular to a signal processing method, related equipment and a LoRa wireless system.
  • the existing solutions are usually implemented by reducing the mutual interference between nodes, that is, the nodes in the network are divided into areas according to the distance from the gateway, and different nodes are allocated to different areas.
  • Spreading factor Although the interference between partitions is controlled to a certain extent in the existing technical solutions, there are still a large number of nodes using the same SF (Spreading Factor) through the ALOHA method in the high-density and massive device access scenario of the Internet of Things Contend for the wireless channel, so the problem of mutual interference between uplink signals of the same SF is not really solved.
  • the uplink interference between nodes using the same SF will cause the average PER (Packet Error Rate) of the system to increase, which severely limits the system capacity of LoRa and makes the system capacity quickly reach saturation.
  • PER Packet Error Rate
  • the present invention provides a signal processing method, related equipment and a LoRa wireless system to reduce the interference between uplink data frames of nodes using the same spreading factor and improve the capacity of the LoRa system.
  • the present invention provides the following technical solutions:
  • a signal processing method applied to a sending device including:
  • the preamble signal and the scrambled data signal are encapsulated into a data frame to be transmitted for transmission by the transmitting device.
  • it also includes:
  • the group number of the scrambling code group in which the preset scrambling code sequence is located is characterized as the group information of the sending device, and the group information is added to the preamble signal.
  • the preamble signal includes several original Chirp signals and Chrip signals modulated by the group of information, and the original Chirp signals represent chirp signals.
  • the performing spreading processing on the bit stream according to a preset spreading factor to obtain an initial spreading signal includes:
  • the decimal number corresponding to the bit segment obtained by the interception is used as an offset, and the original Chirp signal is spread spectrum modulated according to the offset to obtain an initial spread spectrum signal.
  • the performing scrambling processing on the initial spread spectrum signal based on a preset scrambling code sequence to obtain a scrambled data signal includes:
  • the initial spread spectrum signal is multiplied by the preset scrambling code sequence through a multiplier to realize the scrambling processing of the initial spread spectrum signal, and the scrambled data information is obtained.
  • a signal processing method applied to a receiving device including:
  • the method further includes:
  • a sending device including:
  • the spread spectrum module is used to perform spread spectrum processing on the bit stream according to a preset spread spectrum factor to obtain an initial spread spectrum signal;
  • the scrambling module is configured to perform scrambling processing on the initial spread spectrum signal based on a preset scrambling code sequence to obtain a scrambled data signal;
  • the preamble adding module is used to encapsulate the preamble signal and the scrambled data signal into a data frame to be transmitted for transmission by the sending device.
  • the group number of the scrambling code group where the preset scrambling code sequence in the scrambling module is located is characterized as the group information of the sending device, and the group information is added to the preamble signal.
  • the preamble signal in the preamble adding module includes several original Chirp signals and Chrip signals modulated by the set of signals, and the original Chirp signals represent chirp signals.
  • the spread spectrum module includes:
  • the interception unit is used to intercept the bit stream according to the preset spreading factor
  • the spreading unit is configured to use the decimal number corresponding to the bit segment obtained by truncation as an offset, and perform spread spectrum modulation on the original Chirp signal according to the offset to obtain an initial spreading symbol.
  • the scrambling module is specifically configured to:
  • the initial spread spectrum signal is multiplied by the preset scrambling code sequence through a multiplier to realize the scrambling processing of the initial spread spectrum signal, and the scrambled data information is obtained.
  • a receiving device including:
  • the receiving module is used to receive the target signal sent by the sending device
  • the estimation module is used to extract the preamble signal in the target signal and estimate the time offset according to the preamble signal, where the time offset is the time when the sending device and the receiving device are out of sync Offset;
  • a synchronization module configured to synchronize with the sending device according to the time offset
  • the query module is configured to query the preset descrambling sequence list to obtain the descrambling sequence corresponding to the target signal;
  • the descrambling module is configured to descramble the target signal according to the descrambling sequence to obtain an initial spread spectrum signal
  • the despreading module is used for despreading the initial spread spectrum signal to obtain a bit stream.
  • the receiving device further includes:
  • the extraction module is used to extract group information in the preamble signal, where the group information is the group number of the scrambling code group where the scrambling code sequence added by the sending device to the target signal is located; and based on the group information
  • the descrambling sequence corresponding to the target signal is obtained by querying the preset group information association table.
  • a LoRa wireless system including:
  • a communication device having a memory and a processor coupled with the memory, the memory storing one or more programs, and when the one or more programs are executed on the processor, any one of the above is implemented
  • the signal processing method
  • a computer-readable storage medium in which one or more programs are stored, and when the one or more programs are executed on a processor, the signal processing method described in any one of the above is implemented.
  • the present invention provides a signal processing method, related equipment, and a LoRa wireless system.
  • the transmission device performs spreading, scrambling and preamble processing on the bit stream, and adding a scrambling code sequence to the data.
  • the scrambling realizes the protection of the data part, and the orthogonality of the scrambling code can effectively solve the problem of mutual interference of uplink data frames between nodes using the same spreading factor.
  • the total scrambling code sequence is grouped, so When the receiving device performs descrambling, it can search for the corresponding descrambling sequence through the preamble information, so that the descrambling delay is maintained within the allowable range of the wireless system, thereby reducing the interference between the uplink data frames of the nodes using the same spreading factor. Improved the capacity of the LoRa wireless system.
  • FIG. 1 is a schematic flowchart of a signal processing method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another signal processing method provided by an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a signal processing flow of a LoRa wireless system provided by an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a time length change of a collision zone according to an embodiment of the present invention.
  • Figure 5a is a schematic diagram of the detection result of the LoRa system in the prior art provided by the present invention.
  • FIG. 5b is a schematic diagram of a detection result of a LoRa wireless system provided by an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of preamble and data collision according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a preamble signal detection result provided by an embodiment of the present invention.
  • Fig. 8 is a schematic diagram of baseband simulation results provided by the present invention.
  • FIG. 9 is a schematic diagram of a simplified synchronous circuit design provided by an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a sending device according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a receiving device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a signal processing method, which is applied to a sending device.
  • the method may include the following steps:
  • S12 Perform scrambling processing on the initial spread spectrum signal based on a preset scrambling code sequence to obtain a scrambled data signal;
  • the LoRa wireless system provided in the embodiment of the present invention is implemented based on code division multiple access technology.
  • Code Division Multiple Access (CDMA) is based on spread spectrum technology.
  • the information data that needs to be transmitted with a certain signal bandwidth is multiplied by a high-speed pseudo-random code with a bandwidth much larger than the signal bandwidth to make the original data signal
  • the bandwidth is expanded and then sent out after carrier modulation.
  • Chirp spread spectrum technology is used in the embodiment of the present invention.
  • the group number of the scrambling code group where the preset scrambling code sequence is located represents the group information of the sending device, and the group information is added to the preamble signal.
  • the preamble signal (hereinafter referred to as preamble for short) in the embodiment of the present invention includes several original Chrip signals and Chirp signals modulated by the group information.
  • the original Chrip signal represents a linear frequency modulation signal in the usual sense
  • the original Chrip signal refers to a signal generated by modulation of a bit stream, such as a signal generated after a bit stream is modulated by BPSK.
  • Step S11 may include the following steps:
  • the decimal number corresponding to the bit segment obtained by the truncation is used as the offset, and the Chirp signal is spread spectrum modulated according to the offset to obtain the initial spread spectrum symbol.
  • Step S12 may specifically be:
  • the spread spectrum signal is multiplied by the preset scrambling code sequence through a multiplier to realize the scrambling process of the initial spread spectrum signal to obtain scrambled data information.
  • the binary bit stream is intercepted in segments according to the spreading factor (SF) used by the sending device (where the sending device can be understood as a terminal device).
  • SF spreading factor
  • each SF bit intercepted is used to modulate a Chirp symbol.
  • the decimal number corresponding to the intercepted SF bits is used as the offset of the Chirp symbol cyclic shift, and the data bit stream realizes Chirp spread spectrum modulation in the above-mentioned manner.
  • the leading signal is added at the front end.
  • the preamble signal is composed of several original Chirp signals and signals modulated by group information, and the group number of the scrambling code group where the preset scrambling code is located represents the group information of the terminal.
  • Chirp in the embodiment of the present invention is a chirp signal in the usual sense.
  • the embodiment of the present invention also provides a signal processing method, which is applied to a receiving device.
  • the method may include the following steps:
  • S24 Query in a preset descrambling sequence list to obtain a descrambling sequence corresponding to the target signal;
  • the receiving device (which can be understood as a base station device), first extract the preamble signal of the received target signal, multiply it with the original Chirp complex conjugate signal, and perform FFT (Fast Fourier Transformation, fast discrete Fourier Transformation) processing and estimation
  • FFT Fast Fourier Transformation, fast discrete Fourier Transformation
  • the time offset of the out-of-synchronization between the receiving device and the sending device is obtained, and the accurate synchronization of the sending device and the receiving device can be realized by using the time offset.
  • SF 7
  • a Chirp symbol corresponds to 7 bits and 128 chips (2 7 ).
  • the receiving side of the gateway does not necessarily start to receive the signal at the beginning of the Chirp symbol. For example, it may be in the middle of a Chirp symbol (the 50th code).
  • the gateway side After receiving the signal, the gateway side estimates the offset (50) after digital signal processing, that is, knowing that it is received from the 50th chip, it can accurately find the beginning of a Chirp symbol. The start position and subsequent symbols are all aligned accordingly, thus achieving symbol synchronization.
  • the group information carried in the preamble is extracted, and the scrambling code set of the corresponding group is queried in the group information association table stored in the group information of the sending device, and only the correct descrambling sequence is searched in the scrambling code set , It greatly reduces the calculation amount and processing delay of searching scrambling code sequence when the receiver descrambles.
  • the Chirp despreading process is performed to finally recover the information bit stream.
  • the bit stream is spread, scrambled, and preamble added is performed on the transmitting device, and the data part is protected by introducing the scrambling code sequence to the data.
  • Orthogonality can effectively solve the problem of mutual interference of uplink data frames between nodes using the same spreading factor.
  • the total scrambling code sequence is grouped so that when the receiving device performs descrambling, the corresponding descrambling sequence can be obtained through the preamble search, so that the descrambling delay is maintained within the allowable range of the wireless system, thereby reducing the use of
  • the interference between uplink data frames of nodes with the same spreading factor increases the capacity of the LoRa wireless system.
  • a LoRa wireless system is also provided. See FIG. 3, which includes a sending device and a receiving device.
  • the corresponding sending device can be understood as a node device, and the receiving device can be understood as a gateway and related devices.
  • the LoRa wireless system will now be described according to an embodiment of the present invention.
  • the scrambling sequence adopts an extended 7-order m-sequence with a length of 128 (the first bit of the 7-order m-sequence with a length of 127 is padded to the end and extended to 128) .
  • the binary bit stream is first segmented according to a group of 7 bits. It is assumed that a segment of the bit is grouped as [0 0 1 0 0 0 0], which means 16 in decimal, and the duration is 128 chip times
  • the Chirp symbol is cyclically shifted by 16 chip periods, and the spread signal (the signal sampling rate is taken as a sample point for each chip) is multiplied by the extended 7-order m sequence through the multiplier, and the product signal is added in front of
  • the preamble consisting of 7 original Chirp symbols and 1 Chirp symbol modulated by group information (the symbol carrying group information cannot be the first or last symbol) is used for synchronization offset detection and descrambling processing of the receiving device.
  • the receiving device first extract the preamble of the received signal, multiply it with the complex conjugate signal of the original Chirp, and then perform 128-point FFT processing.
  • the time offset corresponding to the maximum spectral amplitude is the estimated out-of-synchronization time offset
  • the amount of movement is compensated to achieve precise synchronization.
  • the Chirp symbol carrying the group information is multiplied by the original Chirp's complex conjugate signal, and the group information is obtained after 128-point FFT processing.
  • the gateway determines the scrambling code sequence search space according to the scrambling code set corresponding to the second group in the group information association table.
  • the correct scrambling code sequence is searched for in a traversal manner to descramble the data.
  • the despreading operation is completed according to the standard LoRa processing flow, and the information bit stream is finally restored.
  • the data frame is composed of two parts: a preamble and a data.
  • the scrambling of the data by the scrambling code realizes the protection of the data part, that is, the duration of the collision zone can be reduced from the entire data frame duration T to the preamble duration T1.
  • T1 ⁇ T can be obtained. Therefore, the probability of collision of the uplink data frame of the code division multiple access LoRa system is greatly reduced.
  • the orthogonality of the scrambling code can effectively solve the problem. The problem of mutual interference of uplink data frames between SF nodes.
  • the information offset of Chirp spread spectrum modulation is 11 and 13, respectively.
  • the two signals interfere with each other. After the machine signal is processed, aliasing occurs in the frequency domain and cannot be distinguished, as shown in Figure 5a.
  • the code division multiple access LoRa system assigns different scrambling code sequences to the two nodes. Even if the two signals collide during transmission, the receiver can still distinguish between the two signals and complete the detection after descrambling. , As shown in Figure 5b.
  • the code division multiple access technology can effectively reduce the mutual interference between nodes using the same SF in the system.
  • the performance improvement in the system due to the reduction of the interference level is mainly reflected in the increase in the capacity of the single gateway system.
  • Table 1 the simulation parameters show that: Compared with the standard LoRa system, the single-gateway system capacity of the code division multiple access LoRa wireless system has increased by 114%.
  • the single-site coverage of the system is one of the important indicators to measure system performance.
  • the link budget is a commonly used evaluation method for evaluating communication systems. The following uses the link budget to analyze whether the introduction of code division multiple access has an impact on the coverage of the LoRa system.
  • the calculation expression of the maximum allowable path loss PL is:
  • I equivalent transmit power
  • PRX receiver sensitivity
  • R receiving antenna gain
  • S receiving antenna shaping gain
  • U receiving antenna diversity gain
  • V receiving feeder loss
  • W fast fading margin
  • X the shadow fading margin
  • Y the switching gain
  • Z the wall penetration loss.
  • RNF is the receiver noise floor
  • SNR is the signal-to-noise ratio required to achieve the target bit error rate
  • N 0 is the thermal noise level
  • NF is the system noise figure
  • K is the Boltzmann constant
  • T is the absolute temperature
  • B is the system bandwidth.
  • the code division multiple access LoRa wireless system assigns a scrambling code to each node.
  • the total amount of scrambling code sequences in the total scrambling code set will be very large. If you use the global traversal method to descramble the signal , Increase the number of calculations and delay on the gateway side. When multiple lines of data are concurrently concurrent, the calculation processing delay caused by the global traversal will be intolerable to the system.
  • the innovative solution is to group the total scrambling code set, and the group number of the scrambling code used by each node is the group information of the node; the group information is modulated into a Chirp symbol in the preamble, and the remaining Chirp Symbols are still used synchronously.
  • the receiver obtains the group information after synchronization, and according to the group information and the stored group information association table, it only searches for the correct scrambling code sequence in the group by traversal to realize the descrambling operation.
  • the foregoing solution greatly reduces the computational complexity in the process of de-scrambling, while maintaining the de-scrambling delay within the tolerable range of the system.
  • the embodiments of the present invention are suitable for application scenarios of low power consumption, wide coverage, high density, and massive node device access in the field of Internet of Things, including but not limited to smart meter reading (water meter, electric meter, gas meter, etc.), smart municipal, smart Transportation, precision agriculture, smart buildings, smart cities, smart homes, etc.
  • this innovation is also applicable to any long-distance communication scenarios with low power consumption, wide coverage, high density, and massive node device access that LoRa is suitable for use.
  • the embodiment of the present invention also provides a sending device 10, referring to FIG. 10, including:
  • the spreading module 101 is configured to perform spreading processing on the bit stream according to a preset spreading factor to obtain an initial spreading signal
  • the scrambling module 102 is configured to perform scrambling processing on the initial spread spectrum signal based on a preset scrambling code sequence to obtain a scrambled data signal;
  • the preamble adding module 103 is configured to encapsulate the preamble signal and the scrambled data signal into a data frame to be transmitted for transmission by the sending device.
  • the group number of the scrambling code group where the preset scrambling code sequence in the scrambling module is located is characterized as the group information of the sending device, and the group information is added to the preamble signal.
  • the preamble signal in the preamble adding module includes several original Chirp signals and Chrip signals modulated by the group of signals, and the original Chirp signals represent the chirp signal.
  • the spread spectrum module 101 includes:
  • the interception unit is used to intercept the bit stream according to the preset spreading factor
  • the spreading unit is configured to use the decimal number corresponding to the bit segment obtained by truncation as an offset, and perform spread spectrum modulation on the original Chirp signal according to the offset to obtain an initial spreading symbol.
  • the scrambling module 102 is specifically configured to:
  • the initial spread spectrum signal is multiplied by the preset scrambling code sequence through a multiplier to realize the scrambling processing of the initial spread spectrum signal, and the scrambled data information is obtained.
  • an embodiment of the present invention also provides a base station 20, referring to FIG. 11, including:
  • the receiving module 201 is used to receive the target signal sent by the sending device
  • the estimation module 202 is configured to extract a preamble signal in the target signal, and estimate a time offset according to the preamble signal, where the time offset is the result of the loss of synchronization between the sending device and the receiving device Time offset
  • the synchronization module 203 is configured to synchronize with the sending device according to the time offset
  • the query module 204 is configured to query the preset descrambling sequence list to obtain the descrambling sequence corresponding to the target signal;
  • the descrambling module 205 is configured to descramble the target signal according to the descrambling sequence to obtain an initial spread spectrum signal
  • the despreading module 206 is configured to perform despreading processing on the initial spread spectrum signal to obtain a bit stream.
  • the receiving device 20 further includes:
  • the extraction module is used to extract group information in the preamble signal, where the group information is the group number of the scrambling code group where the scrambling code sequence added by the sending device to the target signal is located; and based on the group information
  • the descrambling sequence corresponding to the target signal is obtained by querying the preset group information association table.
  • another embodiment of the present invention also provides a LoRa system, which includes:
  • the transmitting device performs the processing of spreading, scrambling and adding the preamble to the bit stream, and the data part is protected by introducing the scrambling code to the data.
  • the orthogonality of the scrambling code can be used to effectively solve the problem.
  • the problem of mutual interference between uplink data frames between nodes with the same spreading factor, and the total scrambling code sequence is grouped in this scheme, so that when the receiving device performs descrambling, the corresponding descrambling sequence can be obtained through the preamble search , So that the descrambling delay is maintained within the allowable range of the wireless system, thereby reducing the interference between uplink data frames of nodes using the same spreading factor, and improving the capacity of the LoRa wireless system.
  • a communication device which has a memory and a processor coupled with the memory, the memory stores one or more programs, and when the one or more programs are in the processor When executed, the following methods are implemented:
  • a signal processing method applied to a sending device including:
  • the preamble signal and the scrambled data signal are encapsulated into a data frame to be transmitted for transmission by the transmitting device.
  • the group number of the scrambling code group in which the preset scrambling code sequence is located is characterized as the group information of the sending device, and the group information is added to the preamble signal.
  • the preamble signal includes several original Chirp signals and Chrip signals modulated by the set of information, and the original Chirp signals represent chirp signals.
  • the performing spreading processing on the bit stream according to the preset spreading factor to obtain the initial spreading signal includes:
  • the decimal number corresponding to the bit segment obtained by the interception is used as an offset, and the original Chirp signal is spread spectrum modulated according to the offset to obtain an initial spread spectrum signal.
  • the performing scrambling processing on the initial spread spectrum signal based on a preset scrambling code sequence to obtain a scrambled data signal includes:
  • the initial spread spectrum signal is multiplied by the preset scrambling code sequence through a multiplier to realize the scrambling processing of the initial spread spectrum signal, and the scrambled data information is obtained.
  • a signal processing method applied to a receiving device including:
  • the method further includes:
  • the embodiment of the present invention provides a storage medium readable by a computing device.
  • a storage medium readable by a computing device.
  • programs are stored on the storage medium to be executed on a processor, the steps of any one of the foregoing signal processing methods are stored.
  • the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt 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 codes.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.
  • the computing device includes one or more processors (CPU), input/output interfaces, network interfaces, and memory.
  • processors CPU
  • input/output interfaces network interfaces
  • memory volatile and non-volatile memory
  • the memory may include non-permanent memory in a computer readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM).
  • RAM random access memory
  • ROM read-only memory
  • flash RAM flash memory
  • Computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
  • the information can be computer-readable instructions, data structures, program modules, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt 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 codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.

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Abstract

本发明公开了一种信号处理方法、相关设备及LoRa无线***，对于发送设备根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；基于预设扰码序列对所述初始扩频信号进行加扰处理，其中，所述预设扰码序列所在扰码组的组号表征为所述终端的组信息；通过所述组信息生成前导信息，将所述前导信号与所述加扰后的数据信息封装成待发射数据帧。通过本发明实现了降低采用相同扩频因子的节点其上行数据帧间的干扰，并提高了LoRa***容量的目的。

Description

一种信号处理方法、相关设备及LoRa无线*** 技术领域
本发明涉及无线通信技术领域，特别是涉及一种信号处理方法、相关设备及LoRa无线***。
背景技术
随着物联网市场规模的迅速增长，新的通信场景对无线传输技术提出了低功耗、广覆盖的新要求。为了满足无线传输技术要求，通常会采用基于Chirp扩频技术的远距离LoRa无线传输方案。
为了保证无线信号的传输质量，现有的方案中通常会通过减轻节点间的相互干扰来实现，也就是将网络中的节点按照距离网关的远近进行区域划分，针对不同区域内的节点分配不同的扩频因子。虽然现有技术方案中分区之间的干扰得到一定控制，但在物联网高密度、海量设备接入的场景下，仍然存在大量的采用相同SF(Spreading Factor，扩频因子)的节点通过ALOHA方式争用无线信道，因此相同SF的上行信号间彼此干扰问题并没有真正解决。而在LoRa***内采用相同SF的节点间的上行干扰将导致***平均PER(Packet Error Rate，误包率)增大，严重限制了LoRa的***容量，使***容量快速达到饱和。
发明内容
针对于上述问题，本发明提供一种信号处理方法、相关设备及LoRa无线***，实现了降低采用相同扩频因子的节点其上行数据帧间的干扰，并提高了LoRa***容量的目的。
为了实现上述目的，本发明提供了如下技术方案：
一种信号处理方法，应用于发送设备，该方法包括：
根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据 信号；
将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
可选地，还包括：
所述预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
可选地，所述前导信号包括若干个原始Chirp信号和被所述组信息调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
可选地，所述根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号，包括：
根据预设的扩频因子对比特流进行截取；
将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对所述原始Chirp信号进行扩频调制，得到初始扩频信号。
可选地，所述基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号，包括：
将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
一种信号处理方法，应用于接收设备，该方法包括：
接收发送设备发送的目标信号；
提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
根据所述时间偏移量与所述发送设备进行同步；
在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
将所述初始扩频信号进行解扩处理得到比特流。
可选地，所述方法还包括：
提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标 信号中添加的扰码序列所在扰码组的组号；并且
基于所述组信息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
一种发送设备，包括：
扩频模块，用于根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
加扰模块，用于基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
前导添加模块，用于将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
可选地，所述加扰模块中的预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
可选地，所述前导添加模块中的前导信号包括若干个原始Chirp信号和被所述组信号调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
可选地，所述扩频模块包括：
截取单元，用于根据预设的扩频因子对比特流进行截取；
扩频单元，用于将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对所述原始Chirp信号进行扩频调制，得到初始扩频符号。
可选地，所述加扰模块具体用于：
将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
一种接收设备，包括：
接收模块，用于接收发送设备发送的目标信号；
估算模块，用于提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
同步模块，用于根据所述时间偏移量与所述发送设备进行同步；
查询模块，用于在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
解扰模块，用于根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
解扩模块，用于将所述初始扩频信号进行解扩处理得到比特流。
可选地，所述接收设备还包括：
提取模块，用于提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标信号中添加的扰码序列所在扰码组的组号；并且基于所述组信息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
一种LoRa无线***，包括：
如上述所述的发送设备和上述所述的接收设备。
一种通信设备，具有存储器和与所述存储器耦合的处理器，所述存储器存储有一个或多个程序，当所述一个或多个程序在所述处理器上执行时，实现上述任一项所述的信号处理方法。
一种计算机可读存储介质，其中存储有一个或多个程序，当所述一个或多个程序在处理器上执行时，实现上述任一项所述的信号处理方法。
相较于现有技术，本发明提供了一种信号处理方法、相关设备及LoRa无线***，在发送设备对比特流进行扩频、加扰和添加前导的处理，通过引入扰码序列对数据加扰实现了对数据部分的保护，利用扰码的正交性可有效解决采用相同扩频因子的节点间上行数据帧相互干扰的问题，并且在本方案中将总的扰码序列进行分组，这样在接收设备进行解扰的时候可以通过前导信息搜索得到对应的解扰序列，使得解扰时延维持在无线***允许范围内，进而降低采用相同扩频因子的节点其上行数据帧间的干扰，提升了LoRa无线***容量。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述 中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1为本发明实施例提供的一种信号处理方法的流程示意图；
图2为本发明实施例提供的另一种信号处理方法的流程示意图；
图3为本发明实施例提供的一种LoRa无线***信号处理流程示意图；
图4为本发明实施例提供的一种碰撞区时长变化示意图；
图5a为本发明提供的现有技术中的LoRa***的检测结果示意图；
图5b为本发明实施例提供的LoRa无线***的检测结果示意图；
图6为本发明实施例提供的一种前导与数据碰撞示意图；
图7为本发明实施例提供的前导信号检测结果示意图；
图8为本发明提供的基带仿真结果示意图；
图9为本发明实施例提供的一种简化的同步电路设计示意图；
图10为本发明实施例提供的一种发送设备的结构示意图；
图11为本发明实施例提供的一种接收设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的说明书和权利要求书及上述附图中的术语“第一”和“第二”等是用于区别不同的对象，而不是用于描述特定的顺序。此外术语“包括”和“具有”以及他们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有设定于已列出的步骤或单元，而是可包括没有列出的步骤或单元。
本发明实施例提供了一种信号处理方法，应用于发送设备，参见图1，该方法可以包括以下步骤：
S11、根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
S12、基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
S13、将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
需要说明的是，在本发明实施例中提供的LoRa无线***是基于码分多址技术实现的。码分多址(Code Division Multiple Access，CDMA)是基于扩频技术，即将需传送的具有一定信号带宽的信息数据，与一个带宽远大于信号带宽的高速伪随机码相乘，使原数据信号的带宽被扩展，再经载波调制后发送出去。在本发明实施例中采用了Chirp扩频技术。其中，预设扰码序列所在扰码组的组号表征所述发送设备的组信息，并且在前导信号中添加所述组信息。
在本发明实施例中的前导信号(后续简称为前导)包括了若干个原始Chrip信号和被所述组信息调制的Chirp信号。其中，该原始的Chrip信号就是表征通常意义上的线性调频信号，原始的Chrip信号就是指比特流经过调制产生的信号，如比特流经过BPSK等调制后产生的信号。
步骤S11可以包括以下步骤：
根据预设的扩频因子对比特流进行截取；
将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对Chirp信号进行扩频调制，得到初始扩频符号。
步骤S12可以具体为：
将所述扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
首先按照发送设备(其中，发送设备可以理解为终端设备)使用的扩频因子(SF)对二进制比特流进行分段截取，在本发明实施例中采用截取的每SF个比特调制一个Chirp符号，所截取的SF个比特对应的十进制数作为Chirp符号循环移位的偏移量，数据比特流即通过上述方式实现了Chirp扩频调制。扩频后的信号通过乘法器与扰码相乘后，再在前端添加前导信号。前导信号由若干原始Chirp信号和被组信息调制的信号组成，所述预设扰码所在扰码组的 组号表征为所述终端的组信息。本发明实施例中的Chirp就是通常意义的线性调频信号。
本发明实施例还提供了一种信号处理方法，应用于接收设备，参见图2，该方法可以包括以下步骤：
S21、接收发送设备发送的目标信号；
S22、提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
S23、根据所述时间偏移量与所述发送设备进行同步；
S24、在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
S25、根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
S26、将所述初始扩频信号进行解扩处理得到比特流。
在接收设备(可以理解为基站设备)，首先提取接收目标信号的前导信号，将它与原始Chirp的复共轭信号相乘后进行FFT(Fast Fourier Transformation，离散傅氏变换的快速算法)处理估算出接收设备与发送设备失步的时间偏移量，利用该时间偏移量即可实现发送设备与接收设备的精准同步。比如SF＝7，一个Chirp符号对应7个比特128个码片(2 7)，网关接收侧不一定在Chirp符号的起始位置开始接收信号，如可能在一个Chirp符号的中间(第50个码片位置)接收到了该信号，经过数字信号处理后网关侧估计出了该偏移量(50)，即获知是从第50个码片开始接收的，它就可以精准地找到一个Chirp符号的起始位置，后续符号相应也全部对齐，从而实现了符号同步。
同步后，再对前导中携带的组信息进行提取，根据发送设备的组信息在其存储的组信息关联表中查询到相应组的扰码集后，仅在该扰码集中搜索正确解扰序列，大幅度降低了接收机解扰时搜索扰码序列的计算量和处理延时。信号解扰后，再进行Chirp解扩处理，最终恢复出信息比特流。
通过本发明实施例提供的信号处理方法，在发送设备对比特流进行扩频、加扰和添加前导的处理，通过引入扰码序列对数据加扰实现了对数据部分的保 护，利用扰码的正交性可有效解决采用相同扩频因子的节点间上行数据帧相互干扰的问题。并且在本方案中将总的扰码序列进行分组这样在接收设备进行解扰的时候可以通过前导信息搜索得到对应的解扰序列，使得解扰时延维持在无线***允许范围内，进而降低采用相同扩频因子的节点其上行数据帧间的干扰，提升了LoRa无线***容量。
在本发明实施例中还提供了一种LoRa无线***，参见图3，包括了发送设备和接收设备，对应的发送设备可以理解为节点设备，而接收设备可以理解为网关及相关设备。现根据本发明实施例对LoRa无线***进行说明。
假设发送设备的SF设置为7，组信息为2，扰码序列采用长度为128的扩展7阶m序列(把长度为127的7阶m序列的第一位补至结尾，扩展至128位)。
在终端，首先按照每7个bit一组对二进制比特流进行分段，假定其中的一段比特分组为[0 0 1 0 0 0 0]，表示十进制的16，将持续时间为128个码片时间的Chirp符号循环移位16个码片周期，将扩频信号(信号采样率按照每个码片采一个样点取值)通过乘法器与扩展7阶m序列相乘，在乘积信号的前面添加7个原始Chirp符号和1个被组信息调制的Chirp符号组成的前导(携带组信息的符号不能是第一个或最后一个符号)，用于接收设备的同步偏移量检测及解扰处理。
在接收设备，首先提取出接收信号的前导，将它与原始Chirp的复共轭信号相乘，再进行128点FFT处理，最大频谱幅值所对应的时间偏移即为估计的失步时间偏移量，经补偿实现精准同步。同步实现后，携带组信息的Chirp符号再与原始Chirp的复共轭信号相乘，经128点FFT处理后获得组信息。网关根据组信息关联表中第2组所对应的扰码集，确定扰码序列搜索空间。在第2组扰码集中，采用遍历的方式搜索正确扰码序列，以对数据进行解扰处理。数据解扰后，按照标准LoRa处理流程完成解扩操作，最终恢复出信息比特流。
参见图4，假定现有技术中的标准LoRa数据帧的持续时间是T，数据帧由前导和数据两部分组成。通过扰码对数据加扰实现了对数据部分的保护，即 可将碰撞区的时长由整个数据帧时长T减小为前导时长T1。根据LoRaWAN协议给出的数据帧各参数取值可得T1<<T，因此码分多址LoRa***其上行数据帧发生碰撞的概率大为降低，利用扰码的正交性可有效解决采用相同SF的节点间上行数据帧相互干扰的问题。
若标准LoRa体制下接收信噪比相同的信号1和信号2在传输过程中时域上存在交叠，Chirp扩频调制的信息偏移量分别为11和13，两信号互为干扰，经接收机信号处理后，在频域发生了混叠，无法区分，如图5a所示。而码分多址LoRa***由于为两个节点分配了不同的扰码序列，即使两信号在传输过程中发生了碰撞，接收机解扰后，依然能够对这两个信号进行区分并分别完成检测，如图5b所示。
前导与数据发生碰撞的场景如图6所示。此时，经仿真验证：现有的LoRa体制下，前导信号不被破坏的下限SIR是6dB，如图7中的a部分所示；而码分多址LoRa***的下限SIR是-8dB，如图7中的b部分所示。通过加扰引入码分技术，***获得了14dB的增益。对于LoRa***而言，通过前导实现同步是数据载荷被成功检出的必要先决条件，因此码分多址LoRa***的正确检测概率将大大增加。
根据前述分析，码分多址技术能有效降低***内采用相同SF的节点间的互相干扰。***内因干扰水平的降低所获得的性能改善最主要体现在单网关***容量的增加。在OPNET仿真环境下，针对单网关、节点均匀分布的高密集场景进行了***仿真，仿真参数如表1所示。如表2所示，仿真结果表明：较之标准LoRa***，码分多址LoRa无线***的单网关***容量提升了114％。
表1
仿真参数 参数取值
网关数 1个
覆盖范围 1km 2
节点拓扑 均匀分布
发射功率 17dBm
节点采用SF 7
***目标误包率 10％
表2
Figure PCTCN2019085975-appb-000001
***单站覆盖范围是衡量***性能的重要指标之一。链路预算是一种评价通信***的常用评估方法，以下通过链路预算来分析码分多址的引入是否对LoRa***的覆盖范围产生影响。最大允许路径损耗PL的计算表达式为：
PL＝I-PRX+R+S+U-V-W-X+Y-Z
其中，I为等效发射功率，PRX为接收机灵敏度，R为接收天线增益，S为接收天线赋形增益，U为接收天线分集增益，V为接收馈线损耗，W为快衰落余量，X为阴影衰落余量，Y为切换增益，Z为墙体穿透损耗。经分析，等式右端的各变量中，码分多址处理唯一影响到的变量有且仅有接收机灵敏度PRX一项。因此，***覆盖距离是否变化等价于接收机灵敏度PRX是否变化。以下对接收机灵敏度加以分析，接收机灵敏度PRX的计算表达式为：
PRX＝RNF-SNR＝N 0+NF-SNR＝10lg(KTB)+NF-SNR
其中，RNF为接收机底噪，SNR为达到目标误码率所需信噪比，N 0为热噪声电平，NF为***噪声系数，K为玻尔兹曼常数，T为绝对温度，B为***带宽。由上式可见：影响两***接收机灵敏度PRX的所有变量中，仅是达到目标误码率所需信噪比SNR一项不同。***覆盖距离的变化最终归结为达到目标误码率所需信噪比SNR是否发生变化。利用MATLAB仿真软件分别在AWGN信道和Rayleigh信道下进行了***基带仿真。如图8中a部分可见：AWGN信道下，标准LoRa和码分多址LoRa***在相同BER条件下所需SNR相同；在图8中b部分典型城区Rayleigh多径信道下，较之标准LoRa***，码分多址LoRa***有0.5dB的增益(可认为近似相同)。因此可得到如下结论：码分多址的引入并不会对接收机灵敏度有不良影响，即码分多址LoRa系 统在增加***容量的同时，单网关的覆盖范围保持不变。
码分多址LoRa无线***为每个节点分配一个扰码，面对物联网海量连接的场景，总的扰码集中的扰码序列总量将十分巨大，如果使用全局遍历的方式对信号解扰，增加了网关侧的计算次数和时延。当多路上行数据同时并发时，全局遍历产生的计算处理时延对***而言将无法容忍。本创新的解决方案是：将总的扰码集分组，每个节点采用的扰码所在组的组号即为该节点的组信息；在前导中将组信息调制到一个Chirp符号中，其余Chirp符号依然做同步使用。接收机在同步后获得组信息，根据组信息及存储的组信息关联表，仅在组内通过遍历的方式搜索正确的扰码序列，实现解扰操作。前述解决方案大幅降低了解扰处理过程中的计算复杂度，同时使得解扰时延维持在***可容忍的范围内。
对于直接序列扩频***，要实现解扩/解扰，接收机本地参考扩频码/扰码序列的相位与接收到的扩频码/扰码序列的相位必须完全一致，这导致直扩***的同步电路十分复杂。码分多址LoRa***沿袭了标准LoRa***的同步机制，通过Chirp前导信号即可实现信号的精准同步，省去了直扩***的捕获电路与跟踪电路(图9中加粗虚线框内部分)，在降低成本的同时，也保证了信号处理时延在可容许范围内，其简化同步电路设计的示意图如图9所示。
本发明实施例适用于物联网领域中低功耗、广覆盖、高密度、海量节点设备接入的应用场景，包括但不限于智能抄表(水表、电表、燃气表等)、智慧市政、智能交通、精准农业、智慧楼宇、智慧城市、智能家居等。此外，LoRa适宜使用的任何低功耗、广覆盖、高密度、海量节点设备接入的长距离通信场景本创新也同样适用。
本发明实施例中还提供了一种发送设备10，参见图10，包括：
扩频模块101，用于根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
加扰模块102，用于基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
前导添加模块103，用于将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
在上述实施例的基础上，所述加扰模块中的预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
所述前导添加模块中的前导信号包括若干个原始Chirp信号和被所述组信号调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
在上述实施例的基础上，扩频模块101包括：
截取单元，用于根据预设的扩频因子对比特流进行截取；
扩频单元，用于将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对所述原始Chirp信号进行扩频调制，得到初始扩频符号。
在上述实施例的基础上，加扰模块102具体用于：
将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
对应的，本发明实施例还提供了一种基站20，参见图11，包括：
接收模块201，用于接收发送设备发送的目标信号；
估算模块202，用于提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
同步模块203，用于根据所述时间偏移量与所述发送设备进行同步；
查询模块204，用于在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
解扰模块205，用于根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
解扩模块206，用于将所述初始扩频信号进行解扩处理得到比特流。
在上述实施例的基础上，接收设备20还包括：
提取模块，用于提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标信号中添加的扰码序列所在扰码组的组号；并且基于所述组信 息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
在上述实施例的基础上，本发明的另一实施例中还提供了一种LoRa***，该***包括：
上述描述的发送设备和接收设备，请参见上述各个实施例，此处不做赘述。
在本发明实施例中的发送设备对比特流进行扩频、加扰和添加前导的处理，通过引入扰码对数据加扰实现了对数据部分的保护，利用扰码的正交性可有效解决采用相同扩频因子的节点间上行数据帧相互干扰的问题，并且在本方案中将总的扰码序列进行分组，这样在接收设备进行解扰的时候可以通过前导信息搜索得到对应的解扰序列，使得解扰时延维持在无线***允许范围内，进而降低采用相同扩频因子的节点其上行数据帧间的干扰，提升了LoRa无线***容量。
在本发明实施例中还提供了一种通信设备，具有存储器和与所述存储器耦合的处理器，所述存储器存储有一个或多个程序，当所述一个或多个程序在所述处理器上执行时，实现以下方法：
一种信号处理方法，应用于发送设备，该方法包括：
根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
进一步地，还包括：
所述预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
进一步地，所述前导信号包括若干个原始Chirp信号和被所述组信息调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
进一步地，所述根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号，包括：
根据预设的扩频因子对比特流进行截取；
将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对所述原始Chirp信号进行扩频调制，得到初始扩频信号。
进一步地，所述基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号，包括：
将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
和/或
一种信号处理方法，应用于接收设备，该方法包括：
接收发送设备发送的目标信号；
提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
根据所述时间偏移量与所述发送设备进行同步；
在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
将所述初始扩频信号进行解扩处理得到比特流。
进一步地，所述方法还包括：
提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标信号中添加的扰码序列所在扰码组的组号；并且
基于所述组信息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
本发明实施例提供了一种计算设备可读存储介质，所述存储介质上存储有一个或多个程序在处理器上执行时，上述信号处理方法中的任一项的步骤。
本领域内的技术人员应明白，本申请的实施例可提供为方法、***、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、 CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
在一个典型的配置中，计算设备包括一个或多个处理器(CPU)、输入/输出接口、网络接口和内存。
存储器可能包括计算机可读介质中的非永久性存储器，随机存取存储器(RAM)和/或非易失性内存等形式，如只读存储器(ROM)或闪存(flash RAM)。存储器是计算机可读介质的示例。
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带，磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质，可用于存储可以被计算 设备访问的信息。按照本文中的界定，计算机可读介质不包括暂存电脑可读媒体(transitory media)，如调制的数据信号和载波。
还需要说明的是，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。
本领域技术人员应明白，本申请的实施例可提供为方法、***或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
以上仅为本申请的实施例而已，并不用于限制本申请。对于本领域技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等，均应包含在本申请的权利要求范围之内。

Claims (17)

  1. 一种信号处理方法，其特征在于，应用于发送设备，该方法包括：
    根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
    基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
    将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
  2. 根据权利要求1所述的方法，其特征在于，还包括：
    所述预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
  3. 根据权利要求2所述的方法，其特征在于，所述前导信号包括若干个原始Chirp信号和被所述组信息调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
  4. 根据权利要求3所述的方法，其特征在于，所述根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号，包括：
    根据预设的扩频因子对比特流进行截取；
    将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对所述原始Chirp信号进行扩频调制，得到初始扩频信号。
  5. 根据权利要求1所述的方法，其特征在于，所述基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号，包括：
    将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
  6. 一种信号处理方法，其特征在于，应用于接收设备，该方法包括：
    接收发送设备发送的目标信号；
    提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
    根据所述时间偏移量与所述发送设备进行同步；
    在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
    根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
    将所述初始扩频信号进行解扩处理得到比特流。
  7. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标信号中添加的扰码序列所在扰码组的组号；并且
    基于所述组信息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
  8. 一种发送设备，其特征在于，包括：
    扩频模块，用于根据预设的扩频因子对比特流进行扩频处理，得到初始扩频信号；
    加扰模块，用于基于预设扰码序列对所述初始扩频信号进行加扰处理，得到加扰后的数据信号；
    前导添加模块，用于将前导信号与所述加扰后的数据信号封装成待发射数据帧以供发送设备发送。
  9. 根据权利要求8所述的发送设备，其特征在于，所述加扰模块中的预设扰码序列所在扰码组的组号表征为所述发送设备的组信息，并且在所述前导信号中添加所述组信息。
  10. 根据权利要求9所述的发送设备，其特征在于，所述前导添加模块中的前导信号包括若干个原始Chirp信号和被所述组信号调制的Chrip信号，所述原始Chirp信号表征线性调频信号。
  11. 根据权利要求8所述的发送设备，其特征在于，所述扩频模块包括：
    截取单元，用于根据预设的扩频因子对比特流进行截取；
    扩频单元，用于将截取得到的比特段对应的十进制数作为偏移量，根据所述偏移量对Chirp信号进行扩频调制，得到初始扩频符号。
  12. 根据权利要求8所述的发送设备，其特征在于，所述加扰模块具体用于：
    将所述初始扩频信号通过乘法器与所述预设扰码序列相乘，实现对所述初始扩频信号的加扰处理，得到加扰后的数据信息。
  13. 一种接收设备，其特征在于，包括：
    接收模块，用于接收发送设备发送的目标信号；
    估算模块，用于提取所述目标信号中的前导信号，并根据所述前导信号估算出时间偏移量，其中，所述时间偏移量为所述发送设备与所述接收设备失步的时间偏移量；
    同步模块，用于根据所述时间偏移量与所述发送设备进行同步；
    查询模块，用于在预设的解扰序列列表中查询得到与所述目标信号对应的解扰序列；
    解扰模块，用于根据所述解扰序列对所述目标信号进行解扰，得到初始扩频信号；
    解扩模块，用于将所述初始扩频信号进行解扩处理得到比特流。
  14. 根据权利要求13所述的接收设备，其特征在于，所述接收设备还包括：
    提取模块，用于提取所述前导信号中的组信息，其中，所述组信息为发送设备在所述目标信号中添加的扰码序列所在扰码组的组号；并且基于所述组信息在预设的组信息关联表中查询得到与所述目标信号对应的解扰序列。
  15. 一种LoRa无线***，其特征在于，包括：
    权利要求8～12所述的发送设备和权利要求13～14所述的接收设备。
  16. 一种通信设备，具有存储器和与所述存储器耦合的处理器，所述存储器存储有一个或多个程序，当所述一个或多个程序在所述处理器上执行时，实现权利要求1-7中任一项所述的方法。
  17. 一种计算机可读存储介质，其中存储有一个或多个程序，当所述一个或多个程序在处理器上执行时，实现权利要求1-7中任一项所述的方法。
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