A method and system for signal diversity combined transmission in heterogeneous transmission medium

Abstract

The invention relates to a method and a system for signal diversity and combined transmission in heterogeneous transmission media, belonging to the field of Internet of Things communication. The system includes a frame structure module, a data modulation module, a transmission medium module, a frame synchronization and SNR calculation module, a frame data body merging module, a data demodulation decision module, and a frame data body decoding module; the method includes data processing at a sending end and a receiving end. Data processing; wherein, the data processing at the sending end includes frame structure construction and data modulation; the data processing at the receiving end includes frame synchronization and SNR calculation, frame data body merging, data demodulation and frame data body decoding. The invention transmits the transmitted Internet of Things frame data through different transmission media, uses the frame header to perform timing synchronization and signal-to-noise ratio calculation at the receiving end, and then divides and merges the frame data bodies received by different transmission media, thereby improving the performance of the system. Communication success rate.

Description

technical field [0001] The invention belongs to the field of Internet of Things communication, and relates to a method and a system for signal diversity and merging of different transmission media in a transmission environment where multiple transmission media coexist in the Internet of Things. Background technique [0002] With the development of mobile communication technology, wireless communication technology has been widely used in the Internet of Things, but the Internet of Things has special requirements for communication technology. [0003] First of all, the amount of data that the IoT system needs to transmit is relatively small, and the real-time requirements are not high. Therefore, it is difficult for the IoT system to obtain stable frequency resources in specific usage scenarios. Different IoT devices can only use carrier sense multiplexing. Access (abbreviation: CSMA) contention uses wireless communication resources. Secondly, there are many communication tra...

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Problems solved by technology

[0006] Due to the harsh communication environment of the Internet of Things, the communication transmission media are all local materials, not specially designed for communication systems. Nodes have serious signal loss, and various electrical equipment on the power line also have an impact on communication, which limits the application and promotion of the power line system

In the Internet of Things system, there are also many limitations in the use of wireless transmission methods. It is difficult for the Internet of Things system to obtain a dedicated frequency band and can only use the shared frequency band, which is the designated public frequency band allocated by the State Wireless Administration, which is shared by multiple IoT systems. These frequency bands, such as China's ISM 470MHz to 510MHz frequency band, are a public frequency band. There are FM broadcasts, walkie-talkies and LoRa systems on this frequency band. In addition, they can also be used for broadband and narrowband power meter reading, so there is inevitably interference from multiple systems sharing frequency bands. , seriously affecting the communication quality

[0007] For the above-mentioned unfavorable communication factors, the Internet of Things system usually can only reduce the adverse effects by increasing the transmission power, increasing the number of retransmissions, and shortening the communication distance, and only one of them can be used in certain periods of time or in certain environments. or several transmission media for communication

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