CN113922838A - Multi-channel LoRa gateway communication system based on SX1276/7/8 and application method - Google Patents
Multi-channel LoRa gateway communication system based on SX1276/7/8 and application method Download PDFInfo
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- CN113922838A CN113922838A CN202111218563.4A CN202111218563A CN113922838A CN 113922838 A CN113922838 A CN 113922838A CN 202111218563 A CN202111218563 A CN 202111218563A CN 113922838 A CN113922838 A CN 113922838A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a multi-channel LoRa gateway communication system based on SX1276/7/8, which comprises a multi-channel gateway, and a receiving antenna and a transmitting antenna which are matched with the multi-channel gateway; the multi-channel gateway is configured to include: a plurality of SX1276/7/8 chips; the multichannel radio frequency front end of a signal receiving channel and a signal sending channel is constructed by matching with each SX1276/7/8 chip, a receiving antenna and a transmitting antenna; and the MCU is matched with each SX1276/7/8 chip to carry out data communication with the external communication interface. The invention provides a communication system obtained based on SX1276/7/8 multichannel LoRa gateway architecture, which comprises a receiving antenna, a transmitting antenna, a multichannel radio frequency front end, M-channel LoRa centers and an MCU data center.
Description
Technical Field
The present invention relates to the field of wireless network communications. More particularly, the invention relates to an SX 1276/7/8-based multi-channel LoRa gateway communication system and an application method thereof.
Background
The LoRa is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and popularized by Semtech corporation in the united states. The scheme changes the prior compromise consideration mode of transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, the LoRa mainly operates in global free frequency bands including 433, 868, 915MHz and the like. The LoRa technology has the advantages of long distance, low power consumption, multiple nodes and low cost.
The SX1276/7/8 chip is a half-duplex low-to-mid frequency transceiver equipped with standard FSK and long-range spread spectrum Lora modems. The chip can be used for ultra-long-distance Lora spread spectrum communication, has strong anti-interference performance and meets the requirement of low power consumption.
A single-channel Lora gateway with low cost can be constructed based on an SX1276/7/8 chip, and has certain communication capacity (line rate). In practical application, when the communication capacity is insufficient, the method can be realized by increasing the number of Lora channels. The single-channel LoRa gateway architecture based on SX1276/7/8 is shown in fig. 2, and is composed of a transceiving antenna, a transceiving switch, an SX1276/7/8 central node and an MCU data center, and the technical scheme is very mature. However, in practical applications, if M Lora channels are added, M transceiving antennas and M switches are usually needed to implement data communication of the M Lora channels, and due to the existing devices, field environments, sizes, and the like, the M transceiving antennas cannot be usually mounted, so that the problem of insufficient communication capacity by adding the Lora channels is limited and cannot be implemented.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a multi-channel LoRa gateway communication system based on SX1276/7/8, including a multi-channel gateway, and a receiving antenna and a transmitting antenna cooperating therewith;
the multi-channel gateway is configured to include:
a plurality of SX1276/7/8 chips;
the multichannel radio frequency front end of a signal receiving channel and a signal sending channel is constructed by matching with each SX1276/7/8 chip, a receiving antenna and a transmitting antenna;
and the MCU is matched with each SX1276/7/8 chip to carry out data communication with the external communication interface.
Preferably, the multi-channel radio frequency front end is configured to include:
the signal receiving and conditioning component is matched with the receiving antenna;
the signal sending and conditioning component is matched with the transmitting antenna;
the signal receiving adjusting assembly and the signal sending conditioning assembly are in communication connection with the input end and the output end of each SX1276/7/8 chip through an output interface and an input interface which are matched with each other, and a corresponding signal receiving channel and a corresponding signal sending channel are constructed.
Preferably, the signal receiving conditioning component is configured to include:
an amplitude limiter cooperating with the receiving antenna;
a radio frequency signal splitter which is matched with each SX1276/7/8 chip;
the output signal of the amplitude limiter is connected with a radio frequency signal shunt through a matched receiving matching network chip;
and a band-pass filter and a low-noise amplifier are also arranged between the amplitude limiter and the receiving matching network chip.
Preferably, the signal transmission conditioning component is configured to include:
a radio frequency signal combiner matched with each SX1276/7/8 chip;
a low pass filter coupled to the transmit antenna;
the radio frequency signal combiner of the amplitude limiter is connected with the low-pass filter through a matched transmitting matching network chip;
and a power amplifier is also arranged between the low-pass filter and the transmitting matching network chip.
A method of applying a multi-channel LoRa gateway communication system, a signal reception flow of the multi-channel LoRa gateway communication system configured to include:
step S10, the receiving antenna sends the received radio frequency signal to the multi-channel radio frequency front end;
step S11, the multi-channel radio frequency front end equally divides the received signals into M paths and respectively sends the M paths of signals to an M-path SX1276/7/8 chip;
step S12, each SX1276/7/8 chip outputs the received signals to an MCU (microprogrammed control Unit), and the MCU accesses the Internet through a standard communication interface to construct a Lora gateway;
the signaling process of the multichannel LoRa gateway communication system is configured to include:
step S20, MCU sends M data signals received from Internet to each SX1276/7/8 chip through standard communication interface;
and step S21, combining the signals received by the SX1276/7/8 chips by the multichannel radio frequency front end and then transmitting the combined signals to a transmitting antenna, so as to realize data communication between each transmitting channel and an external terminal.
Preferably, in S11, in the receiving channel, the high-power interference signal input through the receiving antenna sequentially passes through the limiter, the band-pass filter, the low-noise amplifier, and the receiving matching network chip to perform amplitude limiting, suppression, low-noise amplification, and matching performance improvement;
the processed radio frequency signals are equally divided into M paths through a radio frequency signal splitter and output.
Preferably, in S21, in the transmitting channel, the M rf signals output by each SX1276/7/8 chip are combined into one rf signal combiner, and are sequentially subjected to matching performance enhancement, transmission channel gain and transmission signal power enhancement, and higher harmonic suppression by the transmitting matching network chip, the power amplifier, and the low-pass filter, and then are sent to the transmitting antenna.
The invention at least comprises the following beneficial effects: the invention designs a communication system obtained by a multi-channel LoRa gateway architecture based on SX1276/7/8, which comprises a receiving antenna, a transmitting antenna, a multi-channel radio frequency front end, M-channel LoRa centers and an MCU data center, wherein the communication system under the architecture cancels the design of a receiving and transmitting switch in a single-channel gateway, increases the design of the multi-channel radio frequency front end, and enables each channel to present independent receiving channels and transmitting channels, and has the following effects:
first, the on-line rate (communication capacity) of the Lora gateway can be improved on the premise of not reducing the communication performance;
two independent receiving and transmitting antennas are adopted, so that each channel can work independently and simultaneously without mutual interference, the number of the antennas is small, and the antennas can be easily integrated into one device;
thirdly, each Lora channel is an independent channel, and can work independently or in relay, namely if a certain channel fails, the channel can continue to communicate with the terminal set through the relay of other intact channels, so that the reliability of the gateway is improved;
and fourthly, the multi-channel radio frequency front end can be subjected to customized design in the aspects of transmitting power, channel noise coefficients and anti-interference filtering, is very flexible, and can improve certain performances of the gateway, such as communication distance, specific interference source resistance and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a multi-channel LoRa gateway according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a single-channel LoRa gateway in the prior art;
fig. 3 is a schematic diagram of a multi-channel rf front end in accordance with an embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Fig. 1 shows an implementation form of a multi-channel LoRa gateway communication system based on SX1276/7/8, in which a multi-channel gateway 1, and a receiving antenna 2 and a transmitting antenna 3 are matched with the multi-channel gateway 1, the receiving antenna is used for feeding a received rf signal into a multi-channel rf front-end receiving channel, and the transmitting antenna is used for transmitting the multi-channel signal to a terminal;
the multi-channel gateway is configured to include:
a plurality of SX1276/7/8 chips 4;
the multichannel radio frequency front end 5 is matched with each SX1276/7/8 chip, a receiving antenna and a transmitting antenna to construct a signal receiving channel and a signal transmitting channel, and is mainly used for constructing the receiving channel and the transmitting channel which are matched with the receiving antenna and the transmitting antenna;
the MCU 6 is matched with each SX1276/7/8 chip to carry out data communication with an external communication interface, and the main function of the MCU 6 is to access other interconnected networks through a standard communication interface provided by an MCU data center so as to form a Lora gateway.
In another example, the multi-channel radio frequency front end is configured to include:
the signal receiving and conditioning component is matched with the receiving antenna;
the signal sending and conditioning component is matched with the transmitting antenna;
the signal receiving adjusting assembly and the signal sending conditioning assembly are in communication connection with the input end and the output end of each SX1276/7/8 chip through an output interface and an input interface which are matched with each other, and a corresponding signal receiving channel and a corresponding signal sending channel are constructed.
As with fig. 3, in another example, the signal reception conditioning component is configured to include:
the amplitude limiter 7 is matched with the receiving antenna, and the amplitude limiter of the receiving channel is used for carrying out amplitude limiting processing on the input high-power interference signal, so that a rear-stage circuit is protected from being burnt by the high-power interference signal;
the radio frequency signal splitter 8 matched with each SX1276/7/8 chip is used for dividing the received signals into M paths for output, so that the consistency performance among the channels is improved;
the output signal of the amplitude limiter is connected with the radio frequency signal shunt through a matched receiving matching network chip 9, and the receiving matching network chip of the receiving channel has the functions of improving the matching performance of the receiving channel, reducing signal reflection, preventing the self-excitation phenomenon and optimizing the gain performance of the receiving channel;
a band-pass filter 10 and a low-noise amplifier 11 are also arranged between the amplitude limiter and the receiving matching network chip, in the structure, the band-pass filter of the receiving channel is used for inhibiting the input out-of-band interference signal, so as to prevent the signal blocking and the receiving performance reduction caused by the out-of-band interference signal, and the low-noise amplifier of the receiving channel is used for performing low-noise amplification on the input radio frequency signal, so as to reduce the noise coefficient index of the receiving channel, further improve the receiving sensitivity and improve the receiving performance, therefore, the multichannel radio frequency front end in the scheme can divide the receiving channel into M channels after performing amplitude limiting, band-pass filtering and low-noise amplification on the radio frequency signal from the receiving antenna, receiving the matching network and uniformly dividing the signal into M channels through an M shunt, and respectively sending the M channels to the receiving channel at the center of M LoRa channels;
the signal transmission conditioning component is configured to include:
the radio frequency signal combiner 12 is matched with each SX1276/7/8 chip, and the radio frequency signal combiner of the transmitting channel is used for combining M radio frequency signals into one radio frequency signal to be output;
the low-pass filter 13 matched with the transmitting antenna has the function of low-pass filtering of a transmitting channel, and is used for inhibiting higher harmonics of a transmitted radio frequency signal, preventing the higher harmonics from exceeding electromagnetic interference to an electromagnetic environment and providing electromagnetic compatibility;
the radio frequency signal combiner of the amplitude limiter is connected with the low-pass filter through a matched transmitting matching network chip 14, and the transmitting matching network chip of the transmitting channel is used for improving the matching performance of the transmitting channel, reducing signal reflection, preventing the self-excitation phenomenon and optimizing the gain performance of the transmitting channel;
and a power amplifier 15 is also arranged between the low-pass filter and the transmitting matching network chip, and the power amplifier of the transmitting channel has the function of improving the gain of the transmitting channel and the transmitting signal power so as to meet the performance of the transmission distance of the system.
A method of applying a multi-channel LoRa gateway communication system, a signal reception flow of the multi-channel LoRa gateway communication system configured to include:
step S10, the receiving antenna sends the received radio frequency signal to the multi-channel radio frequency front end;
step S11, the multi-channel radio frequency front end equally divides the received signals into M paths and respectively sends the M paths of signals to an M-path SX1276/7/8 chip;
step S12, each SX1276/7/8 chip outputs the received signals to an MCU (microprogrammed control Unit), and the MCU accesses the Internet through a standard communication interface to construct a Lora gateway;
the signaling process of the multichannel LoRa gateway communication system is configured to include:
step S20, MCU sends M data signals received from Internet to each SX1276/7/8 chip through standard communication interface;
step S21, combining the signals received by the SX1276/7/8 chips by the multichannel radio frequency front end and then transmitting the combined signals to a transmitting antenna to realize the data communication between each transmitting channel and an external terminal;
in S11, in the receiving channel, the high-power interference signal input through the receiving antenna sequentially passes through the limiter, the band-pass filter, the low-noise amplifier, and the receiving matching network chip to perform amplitude limiting, suppression, low-noise amplification, and matching performance improvement;
the processed radio frequency signals are equally divided into M paths through a radio frequency signal splitter and output;
in S21, in the transmitting channel, the M channels of rf signals output by each SX1276/7/8 chip are combined into one channel by the rf signal combiner, and then sent to the transmitting antenna after matching performance improvement, transmitting channel gain and transmitting signal power improvement, and higher harmonic suppression by the transmitting matching network chip, the power amplifier, and the low pass filter in sequence. In the architecture, a communication system obtained by a multi-channel LoRa gateway architecture based on SX1276/7/8 is provided, the design of a transceiving switch in a single-channel gateway is eliminated, and a multi-channel radio frequency front end design is added, so that each channel presents an independent receiving channel and an independent transmitting channel.
Example (b):
the invention provides a hardware implementation method of a multi-channel LoRa gateway based on SX 1276/7/8. The method solves the problems of performance reduction and mutual interference among channels after multi-channel integration by applying a power compensation technology, an antenna sharing technology, low-noise amplification, anti-interference technology and the like.
For better illustration of the present invention, first a single channel LoRa gateway architecture based on SX1276/7/8 is introduced, as shown in FIG. 2. The gateway consists of a transceiving antenna, a transceiving switch, an SX1276/7/8 central node and an MCU data center. The SX1276/7/8 center node is designed based on an SX1276/7/8 chip and is a mature product with low cost at present. The radio frequency front end is divided into a receiving channel and a transmitting channel, a transmitting-receiving antenna is shared by a transmitting-receiving switch, and the transmitting-receiving switch is controlled by an SX1276/7/8 central node state machine. The SX1276/7/8 central node performs data interaction with a rear-end MCU data center through a standard communication interface, and the MCU data center is accessed to other interconnected networks through the standard communication interface to form a Lora gateway. The gateway has its inherent performance parameters such as sensitivity, uplink rate (communication capacity), communication distance, transmission power, transmission rate, etc.
The invention provides a hardware implementation method of a multi-channel LoRa gateway based on SX1276/7/8, and the architecture diagram of the multi-channel LoRa gateway is shown in figure 1. The architecture cancels a receiving and transmitting switch design in a single-channel gateway, so that each channel presents an independent receiving channel and an independent transmitting channel. The multichannel LoRa gateway is composed of a receiving antenna, a transmitting antenna, a multichannel radio frequency front end, M SX1276/7/8 central nodes (M channels) and an MCU data center. The receiving and transmitting antenna is used for receiving and transmitting radio frequency signals; the multi-channel radio frequency front end comprises functions of transmitting channel radio frequency signal power compensation, transmitting and receiving channel radio frequency signal splitting and combining, receiving channel radio frequency signal low noise amplification, receiving channel radio frequency anti-interference filtering and the like; m SX1276/7/8 central nodes form M Lora channels, each Lora channel is communicated with a specific terminal set, and data interaction is carried out with a rear-end MCU data center through a standard communication interface; the MCU data center is accessed to other interconnected networks through a standard communication interface so as to form a multi-channel Lora gateway, the framework comprises M terminal collections, and each collection comprises N terminals.
The above scheme is merely illustrative of a preferred example, and is not limiting. When the invention is implemented, appropriate replacement and/or modification can be carried out according to the requirements of users.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (7)
1. A multi-channel LoRa gateway communication system based on SX1276/7/8 is characterized by comprising a multi-channel gateway, and a receiving antenna and a transmitting antenna which are matched with the multi-channel gateway;
the multi-channel gateway is configured to include:
a plurality of SX1276/7/8 chips;
the multichannel radio frequency front end of a signal receiving channel and a signal sending channel is constructed by matching with each SX1276/7/8 chip, a receiving antenna and a transmitting antenna;
and the MCU is matched with each SX1276/7/8 chip to carry out data communication with the external communication interface.
2. The SX 1276/7/8-based multi-channel LoRa gateway communication system of claim 1, wherein the multi-channel rf front end is configured to include:
the signal receiving and conditioning component is matched with the receiving antenna;
the signal sending and conditioning component is matched with the transmitting antenna;
the signal receiving adjusting assembly and the signal sending conditioning assembly are in communication connection with the input end and the output end of each SX1276/7/8 chip through an output interface and an input interface which are matched with each other, and a corresponding signal receiving channel and a corresponding signal sending channel are constructed.
3. The SX 1276/7/8-based multi-channel LoRa gateway communication system of claim 1, wherein the signal reception conditioning component is configured to include:
an amplitude limiter cooperating with the receiving antenna;
a radio frequency signal splitter which is matched with each SX1276/7/8 chip;
the output signal of the amplitude limiter is connected with a radio frequency signal shunt through a matched receiving matching network chip;
and a band-pass filter and a low-noise amplifier are also arranged between the amplitude limiter and the receiving matching network chip.
4. The multi-channel LoRa gateway communication system based on SX1276/7/8 of claim 1, wherein the signaling conditioning component is configured to include:
a radio frequency signal combiner matched with each SX1276/7/8 chip;
a low pass filter coupled to the transmit antenna;
the radio frequency signal combiner of the amplitude limiter is connected with the low-pass filter through a matched transmitting matching network chip;
and a power amplifier is also arranged between the low-pass filter and the transmitting matching network chip.
5. A method for applying the multi-channel LoRa gateway communication system according to any one of claims 1-4, wherein the signal receiving flow of the multi-channel LoRa gateway communication system is configured to include:
step S10, the receiving antenna sends the received radio frequency signal to the multi-channel radio frequency front end;
step S11, the multi-channel radio frequency front end equally divides the received signals into M paths and respectively sends the M paths of signals to an M-path SX1276/7/8 chip;
step S12, each SX1276/7/8 chip outputs the received signals to an MCU (microprogrammed control Unit), and the MCU accesses the Internet through a standard communication interface to construct a Lora gateway;
the signaling process of the multichannel LoRa gateway communication system is configured to include:
step S20, MCU sends M data signals received from Internet to each SX1276/7/8 chip through standard communication interface;
and step S21, combining the signals received by the SX1276/7/8 chips by the multichannel radio frequency front end and then transmitting the combined signals to a transmitting antenna, so as to realize data communication between each transmitting channel and an external terminal.
6. The method as claimed in claim 5, wherein in S11, in the receiving channel, the high power interference signal inputted through the receiving antenna goes through the limiter, the band pass filter, the low noise amplifier, and the receiving matching network chip in sequence to perform the limiting, suppressing, low noise amplifying, and matching performance enhancing;
the processed radio frequency signals are equally divided into M paths through a radio frequency signal splitter and output.
7. The method as claimed in claim 5, wherein in S21, in the transmitting channel, M paths of RF signals outputted from each SX1276/7/8 chip are combined into one path by the RF signal combiner, and are sent to the transmitting antenna after sequentially performing matching performance improvement, transmitting channel gain and transmitting signal power improvement and higher harmonic suppression by the transmitting matching network chip, the power amplifier and the low pass filter.
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| CN206894631U (en) * | 2017-06-16 | 2018-01-16 | 山东有人信息技术有限公司 | A kind of multichannel Lora concentrators and the IOT systems with the Lora concentrators |
| CN109412631A (en) * | 2018-11-23 | 2019-03-01 | 北京资信物联科技有限公司 | Expandable type LoRa gateway system |
| CN109547188A (en) * | 2018-05-24 | 2019-03-29 | 杭州盈飞驰科技有限公司 | A kind of full duplex multi-channel data transmission device and control method based on LoRaWAN gateway |
| CN212163732U (en) * | 2019-12-31 | 2020-12-15 | 江苏学蠡信息科技有限公司 | LoraWan gateway module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206894631U (en) * | 2017-06-16 | 2018-01-16 | 山东有人信息技术有限公司 | A kind of multichannel Lora concentrators and the IOT systems with the Lora concentrators |
| CN109547188A (en) * | 2018-05-24 | 2019-03-29 | 杭州盈飞驰科技有限公司 | A kind of full duplex multi-channel data transmission device and control method based on LoRaWAN gateway |
| CN109412631A (en) * | 2018-11-23 | 2019-03-01 | 北京资信物联科技有限公司 | Expandable type LoRa gateway system |
| CN212163732U (en) * | 2019-12-31 | 2020-12-15 | 江苏学蠡信息科技有限公司 | LoraWan gateway module |
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