Radiation Detection by Employing Periodic Packets in Power-Line Communication System

摘要

The interference with existing radio broadcasting services because of unintentional radiation is a seriousudproblem in power-line communication (PLC) systems. A radiation detection method based on burst packets,udwhich had been proposed by the authors and was called scan and sum (SAS) method, was a low cost methodudand used to solve the problem. But its measurement took a long time and the burst packets occupied audchannel. To shorten the measurement time, a new method based on periodic packets has been proposed inudthis paper, which is called periodic packet sound (PPS) method. Although both methods record the radiatedudsignal as a sound data, the PPS does not need to scan the frequency of an AM radio receiver but analysesudthe sound data by a cross-correlation operation with a reference signal. First, how to generate the referenceudsignal that depends on the modems is described. Second, an optimization of the packet size is studied, andudfinally it is shown that the detection sensitivity of PPS was maintained to be the same as SAS while theudmeasurement time of PPS was 1/9 shorter than that of SAS. Moreover, the channel occupation of PPS wasudreduced to be 2% of SAS when the packet size was optimized to be 1500 bytes.