MODULATION DEVICE, MODULATION METHOD, DEMODULATION DEVICE, AND DEMODULATION METHOD CAPABLE OF ENHANCING FREQUENCY EFFICIENCY FEATURES AT HIGH POWER EFFICIENCY

摘要

PURPOSE: A modulation device, modulation method, demodulation device, and demodulation method are provided to eliminate a phase difference between symbols during a signal modulation process, thereby realizing high power efficiency. ;CONSTITUTION: A modulation symbol generating unit comprises a symbol mapper(111), multipliers(112~115), a delay device(116), and an adder(117). The symbol mapper maps bit information to be transmitted to generate a baseband symbol. The multipliers multiply a baseband symbol with a cosine function or a sine function to output a result value to the adder. An in-phase signal and an orthogonal phase signal outputted from the multipliers include a voiced signal section and a non-voiced signal section.;COPYRIGHT KIPO 2011