The electromagnetic interference produced by the In-House Broadband over Power Line (BPL) communication systems is a technical aspect that is not completely settled. This article presents a technique in which the length and load of the branches of the network, whose topology is bus, are modified to vary the transfer function of the channel between a transmitter and a receiver in order to reducing the Power Spectral Density (PSD) of the transmitter. The algorithm that develops this technique makes use of three theoretical principles found: the gain by distance, the discrete construction of the channel capacity and directionality of the nodes of transmission and reception. A typical network was studied and as a result, combining this technique with the technique known as Adaptive Transmit Power Management (ATPM), there was a reduction of 26.4 dB in the power spectral density.
