WO2016074220A1

WO2016074220A1 - Data transmission method, wireless transmitting apparatus and wireless receiving apparatus

Info

Publication number: WO2016074220A1
Application number: PCT/CN2014/091117
Authority: WO
Inventors: 章昌焕; 喻娅君
Original assignee: 武汉阿米特科技有限公司; 阿米特无线(欧洲)公司
Priority date: 2014-11-12
Filing date: 2014-11-14
Publication date: 2016-05-19
Also published as: CN104484986A

Abstract

Disclosed are a data transmission method, a wireless transmitting apparatus and a wireless receiving apparatus, which belong to the field of data transmission. The method comprises: acquiring monitoring data measured by a sensor; adopting a pre-determined spectrum spreading factor, a spectrum spreading sequence algorithm and a redundant coding rate to perform orthogonal spectrum spreading coding and redundant coding on the monitoring data; and sending the coded monitoring data to the wireless receiving apparatus. In the present invention, by way of performing orthogonal spectrum spreading coding and redundant coding on monitoring data, and after performing a combined coding mode of the orthogonal spectrum spreading coding and the redundant coding on the monitoring data, much redundant information is added to the monitoring data, thereby greatly enhancing the communication reliability of a channel, the sensitivity of signal reception and the link stability, and a communication distance being greatly prolonged, which is applicable to the long-distance transmission of a small amount of data.

Description

Data transmission method, wireless transmitting device and wireless receiving device

Technical field

The present invention relates to the field of data transmission, and in particular, to a data transmission method, a wireless transmitting device, and a wireless receiving device.

Background technique

With the development and advancement of technology, people use online monitoring technology to obtain acquisition volume in more and more scenes. For example, temperature monitoring of containers, refrigerated trucks, medicine cabinets, freezers, large freezers, remote meter reading of gas meters and water meters, illumination of agricultural greenhouses, soil pH, soil CO ₂ concentration and temperature and humidity monitoring, high-voltage switch Monitoring of temperature, current and voltage in the cabinet.

In order to obtain these acquisition quantities, it is common to install a corresponding sensor in the monitored scene, and then output the collected amount obtained by the sensor to the upper computer. However, in many scenarios, it may be inconvenient to route due to environmental or cost constraints. Therefore, in these environments, data (acquisition volume) transmission can only be achieved by using a wireless method such as zigbee or radio frequency (English: Radio Frequency, RF for short).

When wirelessly transmitting data, a wireless transmitting device is installed in the monitored scene, and a wireless receiving device is installed at a remote end, and the wireless transmitting device relies on a battery as a power source.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems:

Wireless transmission methods such as zigbee or RF have limited transmission distances, affecting the application of online monitoring technology.

Summary of the invention

In order to solve the problems of the prior art, embodiments of the present invention provide a data transmission method, a wireless transmitting apparatus, and a wireless receiving apparatus. The technical solution is as follows:

In one aspect, an embodiment of the present invention provides a data transmission method, which is applicable to a wireless transmitting apparatus, and the method includes:

Obtaining monitoring data measured by the sensor;

Performing spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate;

The encoded monitoring data is transmitted to the wireless receiving device.

In an implementation manner of the embodiment of the present invention, the sending the encoded monitoring data to the wireless receiving device includes:

Periodically detecting electromagnetic waves, and detecting a time interval of the electromagnetic waves is a first time length;

Receiving an electromagnetic wave transmitted by the wireless receiving device, receiving an instruction message of the electromagnetic wave transmission, where the command message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to measure the sensor The monitoring data is sent to the wireless receiving device, and the padding field is used to send the command message for a duration equal to or greater than the first time length;

The encoded monitoring data is transmitted to the wireless receiving device.

In another implementation manner of the embodiment of the present invention, the sending the encoded monitoring data to the wireless receiving device includes:

Transmitting the encoded monitoring data to the wireless receiving device by using a real-time minimum power, where the real-time minimum power is an actual wireless signal strength and a transmitting power when the wireless transmitting device transmits the monitoring data encoded according to the previous frame. And the lowest wireless signal strength required by the wireless transmitting device to transmit data, wherein the actual wireless signal strength/transmit power=the lowest wireless signal strength/the real-time minimum power.

In another implementation manner of the embodiment of the present invention, the method further includes:

And periodically transmitting the encoded monitoring data to the wireless receiving device, the period of sending the monitoring data is a second time length, and the second time length is greater than the first time length; or

When the wake-up signal is generated, the encoded monitoring data is sent to the wireless receiving device, and the wake-up signal is a value comparing the value of the monitoring data output by the sensor with a preset threshold range, and Generated when the value of the monitoring data exceeds the preset threshold range.

On the other hand, an embodiment of the present invention further provides a data transmission method, which is applicable to a wireless receiving apparatus, and the method includes:

Receiving data transmitted by the wireless transmitting device;

The data transmitted by the wireless transmitting device is decoded by using a predetermined spreading factor, a spreading sequence algorithm and a redundant coding rate to obtain monitoring data measured by the sensor.

In another aspect, an embodiment of the present invention further provides a wireless transmitting apparatus, where the apparatus includes:

sensor;

a transceiver for communicating with a wireless receiving device;

a processor, configured to acquire monitoring data measured by the sensor; performing spread spectrum orthogonal coding and redundancy coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate; The transceiver transmits the encoded monitoring data to the wireless receiving device.

In an implementation manner of the embodiment of the present invention, the processor is configured to periodically detect an electromagnetic wave by using the transceiver, and detect a time interval of the electromagnetic wave as a first time length;

The processor is further configured to receive, by the transceiver, an instruction message of the electromagnetic wave transmission when the electromagnetic wave emitted by the wireless receiving device is detected, where the instruction message includes a padding field and a query field, and the query a field is configured to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving device, where the padding field is used to send the command message for a duration equal to or greater than the first time length;

The encoded monitoring data is transmitted to the wireless receiving device by the transceiver.

In another implementation manner of the embodiment of the present invention, the transceiver,

And transmitting, by using the real-time minimum power, the encoded monitoring data to the wireless receiving device, where the real-time lowest power is an actual wireless signal strength when the wireless transmitting device transmits the monitoring data encoded according to the previous frame, The transmit power and the minimum wireless signal strength required by the wireless transmitting device to transmit data are calculated, wherein the actual wireless signal strength/transmit power = the lowest wireless signal strength / the real-time minimum power.

In another implementation manner of the embodiment of the present invention, the processor is further configured to periodically send the encoded monitoring data to the wireless receiving device by using the transceiver, and send the monitoring data. The period of the second time is longer than the first time length; or

When the wake-up signal is generated, the encoded monitoring data is sent to the wireless receiving device by the transceiver, and the wake-up signal is a value comparing the monitored data output by the sensor with a preset threshold range And the size of the monitoring data is generated when the value of the monitoring data exceeds the preset threshold range.

In another aspect, an embodiment of the present invention further provides a wireless receiving apparatus, where the apparatus includes:

a transceiver for communicating with a wireless transmitting device;

a processor, configured to receive, by the transceiver, data sent by a wireless transmitting device;

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

Through the spread spectrum orthogonal coding and redundant coding of the monitoring data, after the monitoring data is combined by the spread spectrum orthogonal coding and the redundant coding combination, a lot of redundant information is added, and the communication reliability and signal of the channel are greatly enhanced. Receive sensitivity and link stability, thus greatly extending the communication distance, suitable for small data transmission over long distances.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

FIG. 1 is an application scenario diagram provided by an embodiment of the present invention;

2 is a flowchart of a data transmission method according to Embodiment 1 of the present invention;

3 is a flowchart of a data transmission method according to Embodiment 2 of the present invention;

4 is a flowchart of a data transmission method according to Embodiment 3 of the present invention;

FIG. 5 is a schematic structural diagram of a wireless transmitting apparatus according to Embodiment 4 of the present invention; FIG.

6 is a schematic structural diagram of a wireless transmitting apparatus according to Embodiment 5 of the present invention;

FIG. 7 is a schematic structural diagram of a wireless transmitting apparatus according to Embodiment 6 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a wireless receiving apparatus according to Embodiment 7 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a wireless receiving apparatus according to Embodiment 8 of the present invention; FIG.

detailed description

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

In order to facilitate the description of the embodiments, the application field of the embodiment of the present invention will be briefly described below. view. Referring to FIG. 1, the scenario includes a wireless transmitting device 10, a wireless receiving device 20, a local machine 30, and a server 40. The wireless transmitting device 10 and the wireless receiving device 20 are connected by wireless transmission, and the wireless receiving device 20 can pass through the local device 30. The wireless receiving device 20 can also be directly connected to the server 40 by a wired connection with the server 40, wherein the wireless transmitting device 10 is provided with a sensor. See the following examples for specific solutions.

Embodiment 1

An embodiment of the present invention provides a data transmission method. Referring to FIG. 2, the method may be performed by a wireless transmitting apparatus, where the method includes:

Step 101: Obtain monitoring data measured by the sensor.

Step 102: Perform spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate.

Specifically, in step 102, the monitoring data may be firstly subjected to spread spectrum orthogonal coding, and then the spread spectrum orthogonally encoded monitoring data may be redundantly coded; or the monitoring data may be redundantly coded and then redundant. The encoded monitoring data is subjected to spread spectrum orthogonal coding.

Specifically, step 102 includes the following steps: first modulating the monitoring data into a digital signal; then performing code modulation on the digital signal using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate to broaden the spectrum of the signal. Then in the subsequent steps, the spread signal is modulated into a radio frequency signal for transmission. After receiving the radio frequency signal on the side of the wireless receiving device, the frequency is first converted to the intermediate frequency, and then despread by the same spreading factor, spreading sequence algorithm and redundant coding rate as the predetermined side of the wireless transmitting device, and then solved. The tone can be restored to the original monitoring data output.

Wherein, the digital signal is encoded and modulated by using a predetermined spreading factor, a spreading sequence algorithm and a redundant coding rate, including:

The original spreading sequence is spread by a spreading factor, and the spreading sequence algorithm includes an original spreading sequence;

Multiplying the spread sequence with a digital signal (baseband signal) to obtain a pseudo random code sequence;

The pseudo random code sequence is redundantly coded by using the above redundant coding rate to obtain a coded modulated signal.

That is to say, the code modulation includes two parts of spread spectrum orthogonal coding and redundant coding, and the following describes the spread spectrum orthogonal coding and the redundancy coding in detail:

The essence of spread-spectrum orthogonal coding is an (N, m) coding, that is, an m-bit information code (monitoring data) is represented by a pseudo-random code of length N. The M-bit information code has M=2 ^m states, collectively referred to as an M-ary spread spectrum system, and the M-ary spread spectrum system requires M mutually orthogonal pseudo-random codes c _i , i=0, 1, 2, 3, ..., M-1 represents M states of the m-bit information code, and M pseudo-random codes of length N and the M states of the m-bit information code have a one-to-one correspondence. In the actual implementation process, the spread spectrum sequence is multiplied by the baseband signal (digital signal) (that is, the modulo two-addition operation) to obtain a pseudo-random code of length N. After the baseband signal is spread, the bandwidth is increased, and the transmission distance is further. .

The spreading sequence can be calculated by a predetermined spreading factor and spreading sequence algorithm. The original spreading sequence needs to be defined in the spreading sequence algorithm. For example, if the current spreading factor is 6, and the original spreading sequence is 1111, the original spreading sequence is expanded to 64 bits per bit by the spreading factor, and then multiplied by the baseband signal to output a final pseudo of length N. random code.

The redundant coding actually performs coding rate processing on the input data, for example, the redundancy coding rate is 4/6, that is, 6 codes are output when 4 codes are input. The greater the redundancy coding rate, the higher the efficiency. When the channel quality is relatively poor, more redundant information needs to be added to ensure that the wireless receiving device can correctly demodulate the signal. More redundant information means a lower coding rate, and at least one code needs to be increased by one redundancy. The remaining code, ie 4/5 encoding. When the channel quality is good, it requires a small number of redundant check bits to demodulate, which can increase the coding rate. The system can select an appropriate coding rate according to the change of the channel, so that the user with good channel quality can obtain a higher rate and improve the stability of the communication. Redundancy coding increases the redundant information by selecting an appropriate coding rate, for example, encoding 1101 to 11101111, which enhances the communication reliability of the channel and makes the transmission distance farther.

The core idea of the spread spectrum orthogonal coding and redundant coding processing mechanism is to reduce the actual radio communication rate by applying these coding processing mechanisms, thereby greatly increasing the wireless transmission distance.

In the traditional RF technology, Gaussian Frequency Shift Keying (GFSK), Frequency Shift Keying (FSK) and Binary Keying (English) are used. : On-Off Keying, abbreviated as: OOK), the receiving sensitivity is up to -122dBm, the adjacent channel rejection ratio is less than 32dB, and based on the 10mW peak RF transmit power, the open transmission distance is 700-800m.

At the same time, the spread spectrum orthogonal coding and the redundancy coding can make the receiving sensitivity of the radio frequency reach -148dBm, the adjacent channel rejection ratio reaches 69dB, and the airborne transmission distance reaches 3km based on the peak radio frequency transmission power of 10mW. It can be seen that although the spread spectrum orthogonal coding and redundant coding are performed, although the communication speed The rate is partially sacrificed, but the RF communication distance and anti-interference ability are greatly improved. These parameters determine that it can realize small data volume long-distance wireless data transmission in complex environments, especially suitable for collection in some complex places (monitoring Data) monitoring and transmission, for example: temperature and humidity monitoring and transmission inside closed objects (containers, refrigerated trucks, medicine cabinets, freezers, large cold storages); temperature and humidity inside densely populated homes; remote meter reading of gas meters and water meters; agriculture Monitoring and remote transmission of light, soil PH value, temperature and humidity, soil CO2 concentration, etc. in the greenhouse; on-line monitoring and transmission of temperature, current and voltage in the high-voltage switchgear.

Step 103: Send the encoded monitoring data to the wireless receiving device.

In the embodiment of the present invention, after the monitoring data is subjected to spread spectrum orthogonal coding and redundant coding, and the monitoring data is subjected to the coding method of the spread spectrum orthogonal coding and the redundant coding combination, a lot of redundant information is added, and the channel communication is greatly enhanced. Reliability, signal receiving sensitivity and link stability, thus greatly extending the communication distance, suitable for small data transmission over long distances.

Embodiment 2

An embodiment of the present invention provides a data transmission method. Referring to FIG. 3, the method may be performed by a wireless transmitting apparatus, where the method includes:

Step 201: Acquire monitoring data measured by the sensor.

Further, the method may further include:

Before acquiring the monitoring data measured by the sensor, the wireless transmitting device automatically detects and analyzes the type of the sensor, performs interface switching, and connects the sensor with the corresponding detecting circuit. Thereby, different sensors are connected with different detection circuits to complete acquisition of monitoring data. Specifically, the wireless transmitting device automatically detects and analyzes the type of the sensor, and: when the wireless transmitting device is powered on, the electronic switch switching sensor is controlled by a micro control unit (English: Micro Control Unit, MCU for short) in the wireless transmitting device. Connected to the circuit, through the corresponding detection mechanism to inform the MCU which interface is the current sensor. For example, the MCU controls the electronic switch to connect the sensor in series with a small resistor, and measures the voltage drop across the small resistor. If the voltage drop is small, the sensor can be judged to be a 4-20 mA current loop interface sensor; otherwise, such as a voltage drop. Larger, it can be initially judged that the sensor is a voltage interface sensor or an RS485 interface sensor. When the detection voltage reaches 5V, the sensor can be considered as an RS485 interface sensor, otherwise the sensor can be considered as a voltage interface sensor. After detecting the corresponding sensor type, the corresponding detection circuit is switched, so that the MCU can pass the positive The exact interface is connected to the sensor.

Through the application of the technical solution, the wireless transmitting device can be compatible with various mainstream interface sensors on the market to realize different types of monitoring data collection.

Step 202: Perform spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate.

Specifically, in step 202, the monitoring data may be first subjected to spread spectrum orthogonal coding, and then the spread spectrum orthogonally encoded monitoring data may be redundantly coded; or the monitoring data may be redundantly coded and then redundant. The encoded monitoring data is subjected to spread spectrum orthogonal coding.

Specifically, step 202 includes the following steps: first modulating the monitoring data into a digital signal; then performing code modulation on the digital signal using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate to broaden the spectrum of the signal. Then in the subsequent steps, the spread signal is modulated into a radio frequency signal for transmission. After receiving the radio frequency signal on the side of the wireless receiving device, the frequency is first converted to the intermediate frequency, and then despread by the same spreading factor, spreading sequence algorithm and redundant coding rate as the predetermined side of the wireless transmitting device, and then solved. The tone can be restored to the original monitoring data output.

In the traditional RF radio technology, GFSK, FSK and OOK modulation are adopted, the receiving sensitivity is up to -122dBm, the adjacent channel rejection ratio is less than 32dB, and based on the 10mW peak RF transmission power, the open transmission distance is 700-800m.

At the same time, the spread spectrum orthogonal coding and the redundancy coding can make the receiving sensitivity of the radio frequency reach -148dBm, the adjacent channel rejection ratio reaches 69dB, and the airborne transmission distance reaches 3km based on the peak radio frequency transmission power of 10mW. It can be seen that although the communication rate is partially sacrificed after the spread spectrum orthogonal coding and the redundant coding, the radio frequency communication distance and the anti-interference ability are greatly improved, and these parameters determine that it can realize small data amount long-distance wireless data in a complicated environment. Transmission, especially suitable for monitoring and transmission of collected quantities (monitoring data) in certain complex places, for example: temperature and humidity monitoring and transmission inside closed objects (containers, refrigerated trucks, medicine cabinets, freezers, large cold storages); dense community families Internal temperature and humidity; remote meter reading of gas meter and water meter; monitoring and remote transmission of light in agricultural greenhouse, pH value of soil, temperature and humidity, soil CO2 concentration; on-line monitoring of temperature, current and voltage in high voltage switchgear Transmission, etc.

Step 203: Send the encoded monitoring data to the wireless receiving device by using the real-time minimum power, and the real-time minimum power is the actual wireless signal strength, the transmitting power, and the wireless transmitting device sent by the wireless transmitting device according to the monitoring data encoded by the previous frame. The minimum wireless signal strength required for the data is calculated, where the actual wireless signal strength / transmit power = the lowest wireless signal strength / real Minimum power.

The lowest wireless signal strength refers to the lowest signal strength required by the wireless transmitting device to transmit information, and the lowest wireless signal strength may be an effective value obtained after a large number of simulation tests.

In a general monitoring data acquisition scenario, although the location of the wireless transmitting device is fixed, the location of the wireless receiving device is not fixed, even when it is in motion (such as in a monitoring vehicle), so the wireless transmitting device and the wireless device The distance between the receiving devices is actually unknown, so the distance can be calculated according to the actual wireless signal strength and the transmitting power when the monitoring data after the previous frame is transmitted, and then the transmission monitoring is calculated using the distance and the minimum wireless signal strength. The real-time minimum power required for the data is transmitted in the transmission of the monitoring data after the next frame encoding, so that the power consumption of the wireless transmitting device can be reduced, so that the average current in the working state of the device is <10 uA, single The battery ensures that the wireless transmitter works for more than 3 years.

When the monitoring data is sent each time, the first frame encoded monitoring data may be transmitted by using the preset power of the system, or may be transmitted by using the real-time minimum power calculated according to the last frame in the previous transmission. The preset power is a default power set in advance according to the actual scene.

In this embodiment, the sending the encoded monitoring data to the wireless receiving device in step 203 can be implemented in the following manner:

Step 1: periodically detecting the electromagnetic wave to confirm whether the wireless receiving device is currently transmitting the command message, and detecting the electromagnetic wave time interval is the first time length.

The time interval for detecting electromagnetic waves can be set according to actual needs, for example, set to 6S.

When the electromagnetic wave is detected, it may be determined whether the wireless receiving device is currently transmitting an instruction message according to the predetermined idle sequence code. For example, when the received electromagnetic wave carries 0XFF, it is confirmed that the electromagnetic wave is transmitted by the wireless receiving device.

Step 2: If an electromagnetic wave emitted by the wireless receiving device is detected, receiving an instruction message for transmitting the electromagnetic wave, the command message includes a filling field and a query field, and the query field is used to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving The device, the padding field is used to cause the instruction message to be sent for a duration equal to or greater than the first length of time.

In general, if you want to implement two-way wireless communication, you need the wireless transmitting device and the wireless receiving device to be in the wireless receiving state at the same time. When there is data to be transmitted, it will switch to the radio frequency transmitting state, but when the wireless transmitting device and the wireless receiving device are in the wireless state. Large current when receiving state High consumption. For the wireless receiving device, since it can be powered by an external power source, there is no need to worry about high power consumption. However, for the wireless transmitting device, since it is powered by a battery, it is necessary to reduce the time in which it is in the wireless receiving state. Reduce power consumption.

Therefore, in the present embodiment, the wireless transmitting apparatus detects the electromagnetic wave in a periodic manner to receive the command message, thereby reducing the time in the wireless receiving state and reducing the power consumption.

In addition, the instruction message sent by the wireless receiving device is composed of a padding field and a query field, wherein the padding field has two functions: one is that since the query field is too short, there may be only a few bits, and if the query field is sent alone, the instruction message is easily caused. The second is that, because the wireless transmitting device periodically receives the command message, if the command message is too short, the command message may not be received by the wireless transmitting device (for example, the time when the command message is sent is in the wireless transmitting device) Between the two tests), the padding field can increase the length of time required for the command message to be sent. When the duration is equal to or greater than the time interval during which the wireless transmitting device detects the electromagnetic wave, the electromagnetic wave transmitting the command message is surely monitored by the wireless transmitting device. Then, the command message sent by the wireless receiving device will definitely be received, and since the wireless receiving device is an external power source, there is no need to consider the power consumption problem.

The padding field may be filled with meaningless bit segments, such as a series of 0s; and the query field may be represented by 4 bits, such as 1010.

In other embodiments, the instruction message may also consist of a padding field and a setting field for modifying parameters on the wireless transmitting device, such as a first time length or the like.

Step 3: Send the encoded monitoring data to the wireless receiving device.

In addition, when the monitoring data is sent, the monitoring data can also be stored. In an extreme situation, if a single data transmission fails due to interference or abnormal power failure of the wireless receiving device, the wireless transmitting device will resume when the communication link is restored. The stored monitoring data is resent to the wireless receiving device, or a breakpoint is transmitted from the failed position to fully ensure the reliability of the entire monitoring data transmission.

In order to reduce the transmission of the above retransmission, the method may further include: monitoring the communication channel by using the frequency sweeping monitoring mode before the monitoring data is sent, and if there is the same frequency point interference signal, automatically hopping to the adjacent channel for monitoring data. send. In addition, the anti-collision automatic avoidance algorithm is also adopted in the software, so that the communication link can be kept stable and reliable, so as to ensure the reliability of the entire monitoring data transmission.

Further, in addition to receiving the instruction message sent by the wireless receiving device, the number of monitoring is performed. The method may further include: periodically transmitting the encoded monitoring data to the wireless receiving device, the period of transmitting the monitoring data is a second time length, and the second time length is greater than the first time length; or

When the wake-up signal is generated, the encoded monitoring data is sent to the wireless receiving device, and the wake-up signal is the value of the monitoring data output by the comparison sensor and the preset threshold range, and the value of the monitoring data exceeds a preset threshold range. produced. For example, if the temperature in the monitoring data is 80 degrees and the threshold range is set to not exceed 70 degrees, a wake-up signal is generated at this time, thereby transmitting the monitoring data to the wireless receiving device.

The second time length can also be set according to the actual scene, for example, 30 minutes or one hour.

Embodiment 3

An embodiment of the present invention provides a data transmission method. Referring to FIG. 4, the method may be performed by a wireless receiving apparatus, where the method includes:

Step 301: Receive data sent by the wireless transmitting device.

The wireless receiving device may also send the received monitoring data to the server through a long-distance transmission method such as General Packet Radio Service (GPRS).

Due to the transmission distance limitation of the RF, the monitoring data is transmitted to the server via GPRS when the distance is too long, so that the area that the server can cover is large enough.

Step 302: Decode the data sent by the wireless transmitting device by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate, to obtain monitoring data measured by the sensor.

Further, the method may further include: sending an instruction message to the wireless transmitting apparatus, where the instruction message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving device, and the padding field is used. The time period for causing the command message to be transmitted is equal to or greater than the time interval at which the wireless transmitting device detects the electromagnetic wave.

In general, if you want to implement two-way wireless communication, you need the wireless transmitting device and the wireless receiving device to be in the wireless receiving state at the same time. When there is data to be transmitted, it will switch to the radio frequency transmitting state, but when the wireless transmitting device and the wireless receiving device are in the wireless state. The current is large in the receiving state and the power consumption is high. For the wireless receiving device, since it can be powered by an external power source, there is no need to worry about high power consumption. However, for the wireless transmitting device, since it is powered by a battery, it is necessary to reduce the time in which it is in the wireless receiving state. Reduce power consumption. Therefore, in the present embodiment, the wireless transmitting apparatus detects the electromagnetic wave in a periodic manner to receive the command message, thereby reducing the time in the wireless receiving state and reducing the power consumption. The instruction message sent by the wireless receiving device is composed of a padding field and a query field, wherein the padding field has two functions: one is that since the query field is too short, there may be only a few bits. If the query field is sent alone, the instruction message is easily lost. Second, because the wireless transmitting device periodically receives the command message, if the command message is too short, the command message may not be received by the wireless transmitting device (for example, the time when the command message is sent is in the wireless transmitting device twice) Between the detections, the padding field can increase the length of time required for the instruction message to be sent. When the duration is equal to or greater than the time interval during which the wireless transmitting device detects the electromagnetic wave, the electromagnetic wave transmitting the command message is surely monitored by the wireless transmitting device. The command message sent by the wireless receiving device will definitely be received, and since the wireless receiving device is an external power source, there is no need to consider the power consumption problem.

Embodiment 4

The embodiment of the invention provides a wireless transmitting device. Referring to FIG. 5, the device includes:

Sensor 401;

a transceiver 402, configured to communicate with a wireless receiving device;

The processor 403 is configured to acquire monitoring data measured by the sensor 401; perform spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate; The encoded monitoring data is sent to the wireless receiving device.

Specifically, the processor 403 may perform the spread spectrum orthogonal coding on the monitoring data, and then perform redundancy coding on the spread spectrum orthogonally encoded monitoring data. The monitoring data may be redundantly coded and then redundant. The encoded monitoring data is subjected to spread spectrum orthogonal coding.

The processor 403 can be configured to: first modulate the monitoring data into a digital signal; and then perform code modulation on the digital signal by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate to broaden the spectrum of the signal. Then in the subsequent steps, the spread signal is modulated into a radio frequency signal for transmission. After receiving the radio frequency signal on the side of the wireless receiving device, the frequency is first converted to the intermediate frequency, and then despread by the same spreading factor, spreading sequence algorithm and redundant coding rate as the predetermined side of the wireless transmitting device, and then solved. The tone can be restored to the original monitoring data output.

The processor 403 can be implemented in the following manner by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate. The processor 403 can be used to:

The spreading sequence can be calculated by a predetermined spreading factor and spreading sequence algorithm. The original spreading sequence needs to be defined in the spreading sequence algorithm. For example, the current spreading factor is 6, the original spreading order When the column is 1111, the original spreading sequence is expanded to 64 bits per bit by the spreading factor, and then multiplied by the baseband signal to output a final pseudo-random code of length N.

In the traditional RF radio frequency technology, GFSK, FSK and OOK are used for modulation. The receiving sensitivity is up to -122dBm, the adjacent channel rejection ratio is less than 32dB, and based on the 10mW peak RF transmitting power, the open transmission distance is 700~800m.

Embodiment 5

An embodiment of the present invention provides a wireless transmitting apparatus. Referring to FIG. 6, the apparatus includes:

Sensor 501;

a transceiver 502, configured to communicate with a wireless receiving device;

The processor 503 is configured to acquire monitoring data measured by the sensor 501; perform spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate; The encoded monitoring data is sent to the wireless receiving device.

Specifically, the processor 503 may perform the spread spectrum orthogonal coding on the monitoring data, and then perform redundancy coding on the spread spectrum orthogonally encoded monitoring data; or may perform redundancy coding on the monitoring data first, and then perform redundancy. The encoded monitoring data is subjected to spread spectrum orthogonal coding.

The processor 503 can be configured to: first modulate the monitoring data into a digital signal; and then perform code modulation on the digital signal by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate to broaden the spectrum of the signal. Then in the subsequent steps, the spread signal is modulated into a radio frequency signal for transmission. After receiving the radio frequency signal on the side of the wireless receiving device, the frequency is first converted to the intermediate frequency, and then despread by the same spreading factor, spreading sequence algorithm and redundant coding rate as the predetermined side of the wireless transmitting device, and then solved. The tone can be restored to the original monitoring data output.

The processor 503 can be implemented in the following manner by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate. The processor 503 can be used to:

In this embodiment, the processor 503 can be configured to periodically detect electromagnetic waves through the transceiver 502, and detect a time interval of the electromagnetic waves as a first time length;

When an electromagnetic wave emitted by the wireless receiving device is detected, the command for receiving the electromagnetic wave transmission is cancelled. The command message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving device, and the padding field is used to enable the command message to be sent for a duration equal to or longer than the first time length; The monitoring data measured by the sensor is acquired, and the encoded monitoring data is transmitted to the wireless receiving device through the transceiver 502.

In general, if you want to implement two-way wireless communication, you need the wireless transmitting device and the wireless receiving device to be in the wireless receiving state at the same time. When there is data to be transmitted, it will switch to the radio frequency transmitting state, but when the wireless transmitting device and the wireless receiving device are in the wireless state. The current is large in the receiving state and the power consumption is high. For the wireless receiving device, since it can be powered by an external power source, there is no need to worry about high power consumption. However, for the wireless transmitting device, since it is powered by a battery, it is necessary to reduce the time in which it is in the wireless receiving state. Reduce power consumption.

In other embodiments, the instruction message may also be composed of a padding field and a setting field, and the setting word The segment is used to modify parameters on the wireless transmitting device, such as the first length of time.

When acquiring the monitoring data measured by the sensor, the processor 503 can automatically detect and analyze the type of the sensor, and perform interface switching, so that different sensors are connected with different detection circuits to complete the acquisition of the monitoring data. Specifically, the processor 503 can be implemented by using an MCU, that is, when the wireless transmitting device is powered on, the MCU in the wireless transmitting device controls the electronic switch to switch the circuit connected to the sensor, and the corresponding detecting mechanism is used to notify the MCU of the current sensor. . For example, the MCU controls the electronic switch to connect the sensor in series with a small resistor, and measures the voltage drop across the small resistor. If the voltage drop is small, the sensor can be judged to be a 4-20 mA current loop interface sensor; otherwise, such as a voltage drop. Larger, it can be initially judged that the sensor is a voltage interface sensor or an RS485 interface sensor. When the detection voltage reaches 5V, the sensor can be considered as an RS485 interface sensor, otherwise the sensor can be considered as a voltage interface sensor. After detecting the corresponding sensor type, the corresponding detection circuit is switched, so that the MCU can connect with the sensor through the correct interface.

In this embodiment, the transceiver 502 is configured to send the encoded monitoring data to the wireless receiving device by using the real-time minimum power, and the real-time minimum power is the actual wireless signal when the wireless transmitting device transmits the monitoring data according to the previous frame encoding. The strength, the transmit power, and the minimum wireless signal strength required to transmit data by the wireless transmitting device, wherein the actual wireless signal strength/transmit power = the lowest wireless signal strength / the real-time minimum power.

The lowest wireless signal strength refers to the lowest signal strength required by the wireless transmitting device to transmit information.

In addition, when the monitoring data is sent, the monitoring data can also be stored in the memory 504. In an extreme situation, if a single data transmission fails due to interference or abnormal power failure of the wireless receiving device, the wireless transmitting device recovers in the communication link. At this time, the monitoring data stored in the memory 504 is retransmitted to the wireless receiving device, or the breakpoint is transmitted from the failure position to fully ensure the reliability of the entire monitoring data transmission.

In order to reduce the transmission of the above retransmission, the processor 503 is further configured to monitor the communication channel by using the frequency sweeping monitoring mode before the monitoring data is sent, and if there is the same frequency point interference signal, automatically hopping to the adjacent channel for monitoring data. Send. In addition, the anti-collision automatic avoidance algorithm is also adopted in the software, so that the communication link can be kept stable and reliable, so as to ensure the reliability of the entire monitoring data transmission.

Further, the processor 503 is further configured to periodically send the encoded monitoring data to the wireless receiving device by using the transceiver 502, and send the monitoring data to a second time length, where the second time length is greater than the first time length; or,

When the wake-up signal is generated, the encoded monitoring data is sent to the wireless receiving device through the transceiver 502. The wake-up signal is the value of the monitoring data output by the comparison sensor and the preset threshold range, and the value of the monitoring data exceeds the preset. The threshold range is generated when.

Embodiment 6

The embodiment of the present invention provides a wireless transmitting device. Referring to FIG. 7, the device may include one or more of the following components: a processor 601, a memory 602, a transceiver 603, a battery 604, a voltage monitoring unit 605, and a power management unit 606. , sensor 607, interface switching circuit 608 and other components. These components communicate over one or more buses. It will be understood by those skilled in the art that the structure of the mobile terminal shown in the figure does not constitute a limitation of the present invention, and it may be a bus-shaped structure or a star-shaped structure, and may include more or less than the illustration. Parts, or combine some parts, or different parts.

The memory 602 is used to store computer execution instructions, and the processor 601 is connected to the memory 602 via a bus. When the wireless transmitting device is in operation, the processor 601 executes a computer executed instruction stored in the memory 602 to enable the wireless transmitting device to execute the first embodiment. Or the data transmission method described in two.

Specifically, the processor 601 is configured to acquire monitoring data measured by the sensor; perform spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundant coding rate; The encoded monitoring data is sent to the wireless receiving device

Further, the processor 601 is further configured to periodically detect the electromagnetic wave, and the time interval of detecting the electromagnetic wave is a first time length;

Receiving an electromagnetic wave transmitted by the wireless receiving device, receiving an instruction message of the electromagnetic wave transmission, the command message includes a filling field and a query field, and the query field is configured to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving device, filling The field is used to cause the instruction message to be sent for a duration equal to or greater than the first length of time;

The encoded monitoring data is transmitted to the wireless receiving device through the transceiver.

The processor 601 can automatically detect and analyze the type of the sensor when acquiring the monitoring data measured by the sensor. The interface switching circuit 608 is configured to perform interface switching under the control of the processor 601, and connect different sensors to different detection circuits to Obtain the acquisition of monitoring data. Specifically, the processor 601 may be an MCU. When the wireless transmitting device is powered on, the MCU in the wireless transmitting device controls the circuit connected to the electronic switch switching sensor 607 in the interface switching circuit 608, and notifies the MCU through a corresponding detection mechanism. What interface is the current sensor? For example, the MCU controls the electronic switch to connect the sensor in series with a small resistor, and measures the voltage drop across the small resistor. If the voltage drop is small, the sensor can be judged to be a 4-20 mA current loop interface sensor; otherwise, such as a voltage drop. Larger, it can be initially judged that the sensor is a voltage interface sensor or an RS485 interface sensor. When the detection voltage reaches 5V, the sensor can be considered as an RS485 interface sensor, otherwise the sensor can be considered as a voltage interface sensor. After detecting the corresponding sensor type, the corresponding detection circuit is switched, so that the MCU can connect with the sensor through the correct interface.

Specifically, the transceiver 603 can be configured to send the encoded monitoring data to the wireless receiving device by using the real-time minimum power, and the real-time minimum power is the actual wireless signal strength and the transmitting power when the wireless transmitting device sends the monitoring data according to the previous frame encoding. And the minimum wireless signal strength required for the wireless transmitting device to transmit data, wherein the actual wireless signal strength/transmitting power=the lowest wireless signal strength/the real-time minimum power.

The monitoring data may also be stored in the memory 602 when the monitoring data is transmitted. In an extreme situation, if a single data transmission fails due to interference or abnormal power failure of the wireless receiving device, the wireless transmitting device may resume when the communication link is restored. The stored monitoring data is retransmitted to the wireless receiving device, or the resume transmission is performed from the failure position to fully ensure the reliability of the entire monitoring data transmission.

In order to reduce the transmission of the above retransmission, the processor 601 can also monitor the communication channel by using the frequency sweeping monitoring mode before the monitoring data is transmitted. If there is the same frequency point interference signal, the frequency hopping frequency is automatically hopped to the adjacent channel for the monitoring data transmission. . In addition, the anti-collision automatic avoidance algorithm is also adopted in the software, so that the communication link can be kept stable and reliable, so as to ensure the reliability of the entire monitoring data transmission.

Further, the processor 601 is configured to periodically send the encoded monitoring data to the wireless receiving device, and send the monitoring data to a second time length, where the second time length is greater than the first time length; or, when the wake-up signal is generated The encoded monitoring data is sent to the wireless receiving device, and the wake-up signal is generated when the value of the monitoring data output by the comparison sensor is different from the preset threshold range, and the value of the monitoring data exceeds a preset threshold range.

In addition, voltage monitoring unit 605 and power management unit 606 are used to monitor and manage battery 604, respectively.

Example 7

An embodiment of the present invention provides a wireless receiving apparatus. Referring to FIG. 8, the apparatus includes:

a transceiver 701, configured to communicate with a wireless transmitting device;

The processor 702 is configured to receive, by using the transceiver 701, data sent by the wireless transmitting device.

The data transmitted by the wireless transmitting device is decoded by using a predetermined spreading factor, a spreading sequence algorithm and a redundant coding rate, and the monitoring data measured by the sensor is obtained.

Further, the processor 702 is further configured to send, by using the transceiver 701, an instruction message to the wireless transmitting apparatus, where the instruction message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving. The device, the padding field is used to cause the command message to be sent for a time period equal to or greater than a time interval at which the wireless transmitting device detects the electromagnetic wave.

Example eight

An embodiment of the present invention provides a wireless receiving apparatus. Referring to FIG. 9, the apparatus may include one or more of the following components: a processor 801, a memory 802, a transceiver 803, an input unit 804, a display unit 805, and a GPRS unit 806. Global Positioning System (GPS) unit 807, battery 808, charging management unit 809, power management unit 810, external power supply interface 811, power failure detection unit 812, sound and light alarm unit 813, communication interface 814 And other components. These components communicate over one or more buses. It will be understood by those skilled in the art that the structure of the mobile terminal shown in the figure does not constitute a limitation of the present invention, and it may be a bus-shaped structure or a star-shaped structure, and may include more or less than the illustration. Parts, or combine some parts, or different parts.

The memory 802 is used to store computer execution instructions, and the processor 801 is connected to the memory 802 through a bus. When the wireless receiving device is in operation, the processor 801 executes a computer executed instruction stored in the memory 802 to enable the wireless receiving device to execute the third embodiment. The data transmission method described.

Specifically, the processor 801 is configured to receive, by using the transceiver 803, data sent by the wireless transmitting device.

Further, the processor 801 is further configured to send, by using the receiver 803, an instruction message to the wireless transmitting apparatus, where the instruction message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving. The device, the padding field is used to cause the command message to be sent for a time period equal to or greater than a time interval at which the wireless transmitting device detects the electromagnetic wave.

In this embodiment, the input unit 804 is configured to acquire input information such as a user's button, voice, and the like to obtain an instruction message.

In the present embodiment, the display unit 805 displays the received monitoring data.

In this embodiment, the GPRS unit 806 is configured to transmit the received monitoring data through the GPRS. The input method is sent to the server.

In this embodiment, the power failure detecting unit 812 is configured to detect whether the external power source is powered off. When the external power source is powered off, the processor 801 can control the wireless receiving device to reduce power consumption, such as turning off the display unit 805, the GPRS unit 806, and Modules such as GPS unit 807.

In this embodiment, when the wireless receiving device is in motion, the GPS unit 807 can be used to perform satellite positioning on the wireless receiving device.

In the present embodiment, the charge management unit 809 and the power management unit 810 are used to manage the charging and use of the battery 808.

In this embodiment, the external power interface 811 can be used to connect to an external power source.

In this embodiment, the processor 801 controls the audible and visual alarm unit 813 to perform an alarm when the monitoring data exceeds the corresponding threshold, thereby alerting the staff.

In this embodiment, communication interface 814 can be used to interface with a local machine to transmit monitoring data.

It should be noted that the wireless transmitting device and the wireless receiving device provided by the foregoing embodiments only use the division of the foregoing functional modules when transmitting data. In actual applications, the functions may be assigned different functions according to needs. The module is completed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the wireless transmitting apparatus and the wireless receiving apparatus provided by the foregoing embodiments are in the same concept as the data transmission method embodiment, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

A data transmission method is characterized in that it is applicable to a wireless transmitting device, and the method includes:

Obtaining monitoring data measured by the sensor;

Performing spread spectrum orthogonal coding and redundant coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate;

The encoded monitoring data is transmitted to the wireless receiving device.
The method according to claim 1, wherein the transmitting the encoded monitoring data to the wireless receiving device comprises:

Periodically detecting electromagnetic waves, and detecting a time interval of the electromagnetic waves is a first time length;

Receiving an electromagnetic wave transmitted by the wireless receiving device, receiving an instruction message of the electromagnetic wave transmission, where the command message includes a padding field and a query field, where the query field is used to request the wireless transmitting device to measure the sensor The monitoring data is sent to the wireless receiving device, and the padding field is used to send the command message for a duration equal to or greater than the first time length;

The encoded monitoring data is transmitted to the wireless receiving device.
The method according to claim 1 or 2, wherein the transmitting the encoded monitoring data to the wireless receiving device comprises:

Transmitting the encoded monitoring data to the wireless receiving device by using a real-time minimum power, where the real-time minimum power is an actual wireless signal strength and a transmitting power when the wireless transmitting device transmits the monitoring data encoded according to the previous frame. And the lowest wireless signal strength required by the wireless transmitting device to transmit data, wherein the actual wireless signal strength/transmit power=the lowest wireless signal strength/the real-time minimum power.
The method according to claim 1 or 2, wherein the method further comprises:

And periodically transmitting the encoded monitoring data to the wireless receiving device, the period of sending the monitoring data is a second time length, and the second time length is greater than the first time length; or

Transmitting the encoded monitoring data to the wireless receiving device when the wake-up signal is generated, the wake-up signal is comparing a value of the monitoring data output by the sensor with a preset threshold The size of the range, and the value of the monitoring data is generated when the value of the preset threshold is exceeded.
A data transmission method is characterized in that it is applicable to a wireless receiving device, and the method includes:

Receiving data transmitted by the wireless transmitting device;

The data transmitted by the wireless transmitting device is decoded by using a predetermined spreading factor, a spreading sequence algorithm and a redundant coding rate to obtain monitoring data measured by the sensor.
A wireless transmitting device, characterized in that the device comprises:

sensor;

a transceiver for communicating with a wireless receiving device;

a processor, configured to acquire monitoring data measured by the sensor; performing spread spectrum orthogonal coding and redundancy coding on the monitoring data by using a predetermined spreading factor, a spreading sequence algorithm, and a redundancy coding rate; The transceiver transmits the encoded monitoring data to the wireless receiving device.
The apparatus according to claim 6, wherein the processor is configured to periodically detect an electromagnetic wave by the transceiver, and detect a time interval of the electromagnetic wave as a first time length;

The processor is further configured to receive, by the transceiver, an instruction message of the electromagnetic wave transmission when the electromagnetic wave emitted by the wireless receiving device is detected, where the instruction message includes a padding field and a query field, and the query a field is configured to request the wireless transmitting device to send the monitoring data measured by the sensor to the wireless receiving device, where the padding field is used to send the command message for a duration equal to or greater than the first time length;

The encoded monitoring data is transmitted to the wireless receiving device by the transceiver.
The apparatus according to claim 6 or 7, wherein said transceiver,

And transmitting, by using the real-time minimum power, the encoded monitoring data to the wireless receiving device, where the real-time lowest power is an actual wireless signal strength when the wireless transmitting device transmits the monitoring data encoded according to the previous frame, The transmit power and the minimum wireless signal strength required by the wireless transmitting device to transmit data are calculated, wherein the actual wireless signal strength/transmit power = the lowest wireless signal strength / the real-time minimum power.
The apparatus according to claim 6 or 7, wherein said processor is further used Transmitting, by the transceiver, the encoded monitoring data to the wireless receiving device, the period of sending the monitoring data is a second time length, and the second time length is greater than the first time Length; or,

When the wake-up signal is generated, the encoded monitoring data is sent to the wireless receiving device by the transceiver, and the wake-up signal is a value comparing the monitored data output by the sensor with a preset threshold range And the size of the monitoring data is generated when the value of the monitoring data exceeds the preset threshold range.
A wireless receiving device, characterized in that the device comprises:

a transceiver for communicating with a wireless transmitting device;

a processor, configured to receive, by the transceiver, data sent by a wireless transmitting device;

The data transmitted by the wireless transmitting device is decoded by using a predetermined spreading factor, a spreading sequence algorithm and a redundant coding rate to obtain monitoring data measured by the sensor.