A method for transmitting a signal on a power line network (3) and a corresponding transmitting unit (T), a receiving unit (R) and a system is presented in order to enhance the coverage and throughput of power line communication systems. It is proposed to provide a plurality of transmission channels, with at least one transmission channel in the power line network (3) (S1), generate at least two auxiliary signals from the signal (S2), transmit said at least two auxiliary signals through at least two of the plurality of channels (S3), receive at least two auxiliary signals through at least two of the plurality of channels (S4) and combine said receive auxiliary signals to obtain said signal (S5).