Design and Testing of a Suitable Transceiver for Full Duplex Communication in Indoor Power Line

Utilization of power lines (PLs) as networking options may need data/signal transfer in both half and full duplex modes. In this paper, a transceiver has been proposed, which enables full duplex connection between equipments having RJ-11 jacks, using Narrowband Transmission. The system is tested in a typical indoor PL setting for two PCs equipped with 56 kbps modems under usual household condition. Suitable couplers and line tuners are used to overcome the problems related to signal injection, reception and noise. An active hybrid having a Digital Signal Processor (DSP) -based echo canceller enables suitable signal conditioning before transmission to the PL using a dual frequency carrier (170 and 430 kHz) scheme. Variable bit rates ranging from 1.2 to 33.6 kbps have been obtained depending on the channel condition of the PL.