| 摘要 |
A communication system for a power line is described. A transmission system of the communication system divides the time axis into a number of time slots synchronized such that one time slot can start about a zero crossing of the power line signal. These time slots are referred to as channels and are numbered from 1 to n. A modulation method is described to is narrow band continuous phase FSK, where a number m of modulating frequencies are used, arranged such that an integral number of fu ll cycles fit into each channel time slot for all m frequencies. The system transmits duri ng only a subset of the available time slots (channels) concentrated near the zero crossing of the power line waveform where the noise is typically minimal.
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