KEYWORDS: Telecommunications, Satellite communications, Satellites, Data transmission, Data communications, Data processing, Data conversion, Video, Image compression, Antennas
The current power communication system in China is mainly based on ground communication technologies such as power optical fiber, industrial Ethernet, 4G, 5G wireless public networks, etc. After extreme weather and natural disasters, the power communication system is easy to be damaged, resulting in the inability of the power system. Power space-based IoT business integration system can collect video, image, and power service data and carry out AI calculation. It uses satellite communication means to achieve all-day, all-weather, stable data transmission. The communication channels are safe and reliable. The system can ensures reliable communication on various levels and types of power communication platforms, and ensures stable operation of the power grid.
OFDM is widely used in wireless communication with the development of the communication technology. Timing synchronization is the important part of the receiver in OFDM system. The performance of timing synchronization may have a great influence on signal reception. So far, many researchers have made a lot of studies on timing synchronization. However, classical algorithms always focus on AWGN channel and Rayleigh channel. However, the synchronization performance of classical ones will sharply decrease in Rician channel. This paper proposes a new timing synchronization algorithm based on Rician channel. Simulation results show that the performance is much better than the classical ones.
In response to the requirements of power emergency communication and the shortage of existing emergencycommunication system, an emergency communication solution with the core of "ultra-small portable satellite station, wireless broadband Mesh ad hoc network equipment, multimedia dispatching system, individual equipment" is proposedto establish a power emergency integrated communication solution, which has the ability of “three places linkage, integrated coverage, rapid response, flexibility and robustness”. The emergency communication systemcan be usedinvarious application scenarios, and has been tested and verified in terms of function, performance and reliabilityinmountainous and underground environments without public network, and has successfully carried out peak summer drills and emergency rescue and disaster relief many times at the front line.
KEYWORDS: Data transmission, Inspection, Telecommunications, Data communications, Environmental monitoring, Network architectures, Wireless communications, Power grids
Under the ground that the next generation of power systems is constructing, our research work focuses on the core capabilities of power communication networks for transmission lines, including coverage, service-bearing capacity, flexibility and convenience, and technical security. We propose a convergence solution of heterogeneous networks to form a stable and reliable communication link based on 5G, ad hoc networks, and other technologies to solve the problem of poor network coverage in remote areas and realize data collection and remote control in areas without signal coverage. This system supports the establishment of intelligent monitoring and inspection of overhead transmission lines, offers an early warning service network system, and promotes the improvement of power digital space holographic perception and interconnection capabilities. Finally, we will realize an all-time communication named “anytime, anyplace, always online.”
Aiming at the advantages of less I2C interface lines and simplified control mode, I2C interface is used to read the data of sensor equipment. Firstly, the sensor node is composed of six modules: power supply module, sensor module, calculation module, storage module, communication module and embedded software system, and the functions of these modules are described in detail. Then the master-slave devices corresponding to I2C drive are introduced; Then the I2C protocol and the functions of bme680 sensor used in this scheme are summarized, including the bus composition, communication principle and bus physical topology of I2C. The functions of bme680 sensor introduce bme680 sensor, pin layout and pin assignment. The whole I2C driver design includes the configuration process of bme680 sensor, read-write timing and driver design. The I2C bus device driver is designed, and the driver that reads the data of bme680 sensor device in the sensor node with the new Tang processor m263kiaae is implemented. The driver can successfully read bme680 sensing data.
KEYWORDS: Signal to noise ratio, Optical networks, Receivers, Transmitters, Critical dimension metrology, Networks, Multiplexing, Digital signal processing, Fiber optic communications
A method of using pilot-tone to monitor optical signal-to-noise ratio (OSNR) is proposed in the paper. High-order statistical moments of pilot component are utilized to evaluate the noise level of the transmitted optical signals. This method of OSNR monitoring has the advantage of insensitivity to chromatic dispersion (CD) and polarization mode dispersion (PMD). Simulations are carried out in optical Nyquist transmission system. It is shown that the method has 1 dB monitoring accuracy over a wide OSNR range from 5 dB to 25 dB.
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