Performance evaluation of an OFDM using unitary matrix frequency modulation for power line communications over impulsive noise channels

Power line channel is the time-and-frequency variant and exhibits remarkable difference between locations, according to its network topology, the types of wire lines. Moreover, many electrical appliances frequently cause man-made electromagnetic noise on power line channels. Such man-made noise has the impulsive characteristics. These are technically critical problems to realize the power line communications with high rate and high reliability. To overcome the above-mentioned problems, in this paper, we consider the unitary signal constellation scheme. In the PLC channel, the channel response at a particular subcarrier frequency is not supposed to be totally different from its neighboring frequencies, and hence, they must have correlation which depends on the coherence bandwidth of the channel Bc. When we assign the diagonal components of the diagonal code as an unitary signal constellation on neighboring frequencies. In this case, the diagonal components do not achieve the frequency diversity. However, we split the diagonal components over the coherence bandwidth, the detected signal can achieve the frequency diversity. The proposed PLC/OFDM system outperforms compared with the conventional PLC/OFDM.