Patent ID: 7072411

Claim:
An apparatus for transmitting an OFDM signal, said apparatus comprising: a transform block that converts a group of subcarriers of an OFDM symbol to a set of time domain samples of said OFDM symbol to form a time domain burst; and a frequency domain mapping block that assigns modulated subcarriers of said group to subchannels of said OFDM symbol so that said transform block outputs a time domain digital signal positioned at an intermediate frequency (IF), and that adjusts values of subcarriers of said group of subcarriers so that said samples of said OFDM symbol have strictly real values, such that there are a total of N values for N positive and negative frequency subchannels to be converted to a set of real-valued time domain samples, wherein the transform block includes a preprocessor to map the N values to a first N/2-point complex-valued series using a first mapping function, an n/2-point transformer to perform an inverse discrete Fourier transform on said first N/2-point complex-valued series to obtain a second N/2-point complex-valued series; and a postprocessor to map real and imaginary components of said second N/2-point complex-valued series to the set of real-valued time domain samples using a second mapping function.