Modulation of signals

A method of demodulating an OFDM signal, which includes detecting the PAPR of an OFDM modulated signal;

• determining a dominant frequency component control factor and a constant division term of the OFDM modulated signal by examining the PAPR of the OFDM signal;
• re-introducing the dominant frequency into the modulated OFDM signal;
• and
• re-constructing the real and imaginary components of the OFDM signal from the received signal through a series of unique steps.

An OFDM modulator, which includes

• a scaling unit for scaling the imaginary and real components of the transformed input signal;
• an offset term addition unit, for adding an offset term to the real portion of the input message;
• a phase modulator for modulating the real and imaginary components of the input message by using a cosinusiodal;
• a subtraction unit for subtracting the phase modulated OFDM imaginary component from the phase modulated OFDM real component;
• and
• a subtraction unit operable to subtract a predefined dominant frequency from the signal.

An OFDM demodulator, which includes

• a PAPR detection unit for determining the PAPR of an input signal;
• a lookup table referencing the PAPR against predefined values for a dominant frequency component control factor (γ), an offset term (Ψos), a constant division term (ζ);
• a processor for determining the dominant frequency component from the values in the lookup table;
• an addition unit operable to add a predefined dominant frequency to the signal;
• and
• an unique OFDM demodulator for demodulating the real and imaginary components of an OFDM signal.