
The current national policies and technical requirements related to electromagnetic radiation administration of mobile communication base stations in China are described, including laws and regulations on electromagnetic radiation management, electromagnetic environmental impact assessment system for mobile communication base stations, technical standards, etc.. [pdf]

The basic base station equipment for digital mobile communications systems consists of amplifiers (AMP) to amplify the transmission and reception signals to desired levels, modems (MDE) to convert base band signals to high-frequency signals, speech processors (SPE) to convert voice signals to digital code strings, base station control equipment (BCE) that allocates radio channels and switches over channels with adjacent base stations, and the base station antennas (ANT). [pdf]

Antenna feeder system: responsible for sending and receiving signals, including antennas and feeders; RF unit: responsible for signal generation and extraction, my most important part; Baseband unit: responsible for information processing, the core of all components; Supporting system: Provide support for the above-mentioned systems, including iron towers, computer rooms, power-supply air conditioners and other equipment. [pdf]

This research focuses on the discussion of PV grid-connected inverters under the complex distribution network environment, introduces in detail the domestic and international standards and requirements on grid-connected inverter grid adaptability, and then analyzes in depth the impacts of the access point voltage changes, access point frequency changes, and access point harmonic changes on the inverters.Can grid-connected PV inverters improve utility grid stability? [pdf]
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