Research Of The Wireless PLC Modem Based On Bluetooth Technology

This thesis presents the researching achievements focused on the technical solutions and implementations of the wireless modem applied to power line communication (PLC) systems..By briefly analyzing the PLC technologies, both the channel characteristics and the modulating methods in the PLC system are studied in detail. The multi-path channel model of low voltage power lines is formed, and the Orthogonal Frequency Division Multiplexing (OFDM) technology is chosen as the modulation in such multi-path channels. The feasibility of applying the OFDM technology to the PLC systems is testified by simulating the performances of PLC system under the condition of both multi-path channel and OFDM modulation.Considered the design requirement and the development cost, the INT5500 (made by Intellon) is chosen as a core chip, and the Bluetooth protocol is chosen as the air interface for designing the wireless modem in the PLC system. The technical solutions and implementation of the wireless modem are put forward, and the key technical issues are in-depth analyzed and researched. The DC power supply for the PLC system is design by coupling the wireless modem with the low voltage electricity system and transforming the 220v AC to the more adaptive lower voltage, so the DC source is completely integrated with the designed modem. The complex coupling technology combined the electromagnetic coupling and resistance-capacitance (RC) coupling is adopt to the design in order to couple the wireless modem with the power line more safely. The protocol stack of the wireless power line modem is also put forward in this thesis by referring PLC specification HomePlug version 1.0.The field testing results from the prototype of the wireless PLC modem show that the wireless PLC modem can access the low voltage electricity network safely, and the data can reliably be transmitted through the power line.