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.
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.”
Differential protection of distribution network has high communication requirements for reliability, time delay and delay jitter. Theoretically 5G can meet these requirements. However, real network test results show that there are problems such as burst large delay and burst packet loss for differential protection based on the current 5G network, and deterministic capability of the current network is poor. This paper first gives the real network test results of differential protection based on 5G, and then gives a general description of deterministic technologies and the possible solution to meet the requirements of differential protection.
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.
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