Patent ID: 8406329
Filing Date: 2013-03-26
Classification: H04B,H04L

Abstract:
1. A transmitter for transmitting signals over a Power Line Network (PLN) to a receiver, said PLN including at least phase, neutral and protective line wires so that said PLN establishes multiple wired transmission paths, said transmitter comprising: an adaptive quadrature amplitude modulation (QAM-modulation) unit to QAM modulate a signal according to an OFDM (orthogonal frequency division multiplex) tonemap; an eigenbeamforming unit to eigenbeamform an output of said adaptive QAM-modulation unit according to an eigenbeamforming encoding matrix; an OFDM modulation device to OFDM modulate an output of said eigenbeamforming unit; and a receiving device connected to said adaptive QAM-modulation unit and to said eigenbeamforming unit, wherein said receiving device is configured to receive an eigenbeamforming feedback signal and a tonemap feedback signal from a receiver via said PLN, said eigenbeamforming feedback signal being descriptive of an eigenbeamforming encoding matrix and said tonemap feedback signal being descriptive of an OFDM tonemap corresponding to said multiple wired transmission paths of said PLN, and said adaptive QAM-modulation unit is configured to use said OFDM tonemap, which corresponds to said tonemap feedback signal, and said eigenbeamforming unit is configured to use said eigenbeamforming encoding matrix, which corresponds to said eigenbeamforming feedback signal.