Patent ID: 6950389

Claim:
A transmitter for use in an Orthogonal Frequency Division Multiplexing (OFDM) based transmission system, the transmitter comprising: a differential encoder that generates a corresponding encoded output symbol from a corresponding input symbol to said transmitter, said differential encoder including a multiplier for multiplying said input symbol with a prescribed previous output symbol from said differential encoder so that the phase values of said input symbol and said prescribed previous output symbol are the same; an inverse fast Fourier transform unit that generates inverse fast Fourier transform versions of output symbols from said differential encoder; and an inverse discrete Fourier transform unit that generates inverse discrete Fourier transform versions of said inverse fast Fourier transform versions of said differential encoder output symbols as transmitter output data symbols, wherein phase values of said transmitter output data symbols are not required to be transmitted to a remote receiver for said receiver to generate received versions of said input symbols corresponding to said transmitter output data symbols.