COMMUNICATION OPTIMISATION METHOD FOR A MULTI-USER OFDM DIGITAL TRANSMISSION SYSTEM USING THE ELECTRICAL NETWORK

摘要

The invention relates to a communication optimisation method for multi-user OFDM digital transmission systems using the electrical network. The receiver s of the equipment (1, 2) monitor the quality of the communication and estimat e the signal/noise ratio (S/N) of the uplink and downlink channel carriers. Th e user pieces of equipment (2) perform said surveillance independently of whether or not said equipment is the recipient of the transmission. The optimum transmission mode is selected using said surveillance consisting in modifying, packet by packet, the number of bits per carrier, the redundancy introduced by FEC generated error correction/detection codes, the actual FEC code and/or the transmission mode. In this way, the network can be divided u p optimally in terms of frequency and time and the transmission capacity of th e multiple pieces of user equipment can be maximised. The invention is suitabl e for point-to-multipoint bi-directional communication across the electrical network.