Patent ID: 6553079
Filing Date: 2003-04-22
Classification: H04L

Abstract:
A modulator for modulating input data, said modulator comprising:an input for receiving data to be modulated; a plurality of memory regions arranged to contain information relating to a modulation method to be carried out by said modulator, at least one of said memory regions providing time independent modulation values and at least one of said memory regions providing time dependent modulation values, the values provided by said memory regions being dependent on the data received via said input; wherein each memory region may be used in a plurality of modulation methods; processing means for providing a modulating signal based on the values provided by said memory regions; and an output for outputting modulated data, wherein the output of the modulator is defined by the following equation: (âˆ«Aâ€²(t,data_amp)dt+Ao(data_amp))cos(&ohgr;c t+âˆ«&PHgr;â€²(t,data_ph)dt+&PHgr;o(data_ph)) â€ƒâ€ƒ(1) where:Aâ€² (t,data_amp) is the output of the memory region providing time dependent amplitude modulation values; Ao (data_amp) is the output of the memory region providing time independent amplitude modulation values; &PHgr;â€² (t,data_ph) is the output of the memory region providing time dependent phase modulation values; &PHgr;o (data_ph) is the output of the memory region providing time independent phase modulation values; and &ohgr;c is the frequency used to carry the modulation signal.