http://waset.org/publications/2909/the-effects-of-multipath-on-ofdm-systems-for-broadband-power-line-communications-a-case-of-medium-voltage-channel
Power-line networks are widely used today for
broadband data transmission. However, due to multipaths within the
broadband power line communication (BPLC) systems owing to
stochastic changes in the network load impedances, branches, etc.,
network or channel capacity performances are affected. This paper
attempts to investigate the performance of typical medium voltage
channels that uses Orthogonal Frequency Division Multiplexing
(OFDM) techniques with Quadrature Amplitude Modulation (QAM)
sub carriers. It has been observed that when the load impedances are
different from line characteristic impedance channel performance
decreases. Also as the number of branches in the link between the
transmitter and receiver increases a loss of 4dB/branch is found in the
signal to noise ratio (SNR). The information presented in the paper
could be useful for an appropriate design of the BPLC systems.