4.4. Noise Environment
4.4.1. Noise Sources
Without electromagnetic shielding, power line cables are sensitive to ingress noises from radio frequency devices and other electromechanical equipment. Partially unbalanced wiring resulting from two-phase appliances and three-way switches makes the noise pickup a little worse. On the other hand, many household appliances, except light bulbs, make severe quasi-stationary or transient noise. Some of them are synchronized to the 60-Hz AC cycle, and others are impulses. Many of them can also come from nearby neighbors sharing the same transformer. From time to time, the noise level from a nearby appliance can exceed the transmit signal level. Information needs to be spread in both time and frequency domains ...
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