A method for the determination of modulation method for under - carrier of an ofdm - symbol

摘要

A method for the determination of modulation method for under - carrier of an ofdm - symbol, wherein the under - carrier are collected together in groups and the modulation method for under - support of a group during an initialization phase is identical, wherein for this purpose,a) first of all the signal - signal-to-noise ratio (snr) of each channel is determined andb) from the central signal - signal-to-noise ratio (av _ snr) of the group consisting of the modulation method is determined for the group consisting of,characterized in thatc) from the signal - signal-to-noise ratio (snr) of each channel a measure of quality (t2) for each individual under - carrier is determined andd) either in the case of an allocation of modulation methods, in the case of which a greater number of bits can be transmitted than by means of a target value is predetermined, as long as the under - carrier with the lowest quality value is determined, and the modulation method for these under - carrier is lowered by one bit, to the target value is reached ore) in the case of an allocation of modulation methods, in which a smaller number of bits can be transmitted than by means of a..