Narrow-Band, Low Data Rate Communications on the Low-Voltage Mains in the CENELEC Frequencies, Part 2: Multiplicative Signal Fading and Efficient Modulation Schemes

This is the second of a two-part series on communications over the European 240 V domestic power line, in the frequencies identified by the CENELEC European mains signaling standard, suitable for low-cost equipment in applications requiring data rates of no more than hundreds of bits per second. To minimize costs narrowband modulation techniques are considered. The series of two papers identifies the key impairments introduced by the channel, proposes a novel model structure to simulate them, and describes modulation techniques. Part one describes the principal linear impairments; cyclic noise power variation and linear signal attenuation. Part two, the present paper, describes nonlinear multiplicative signal fading and shows how orthogonal frequency division modulation (OFDM) can be used to overcome these impairments.