Patent ID: 8503571

Claim:
An apparatus, comprising: a modulator for generating modulation information according to one of at least a first modulation scheme or a second modulation scheme, the modulator comprising: i) an input arranged to receive an input symbol; ii) a modulation element arranged to generate a modulation output symbol for use in modulating a carrier in dependence on the input symbol and a selected one of the first or second modulation schemes; and iii) an output for outputting the modulation output symbol; wherein the first modulation scheme comprises a first set of b discrete symbols which may be represented by any of a first set of a modulation symbol positions indicative of a first set of carrier waveform parameters, and the second modulation scheme comprises a second set of y discrete symbols which may be represented by a second set of x modulation symbol positions indicative of a second set of carrier waveform parameters, the second set of modulation symbol positions being a subset of the first set of modulation symbol positions; wherein the modulation element comprises a conversion element arranged in use to convert the input symbols in accordance with a conversion factor selected in dependence on the modulation scheme to be used, wherein the conversion factor is given by a/b for the first modulation scheme, and by a/y for the second modulation scheme.