Patent ID: 7564908

Claim:
A communication device comprising: a signal processing unit having an orthogonal modulator that receives a plurality of symbols, wherein the plurality of symbols comprises a plurality of symbols associated with users data and a plurality of symbols associated with pilot data, and that comprises: a serial-to-parallel converter that assigns each symbol of the plurality of symbols to a frequency sub-band of a plurality of frequency sub-bands to produce a plurality of assigned symbols; a phase shifter module that produces a plurality of phase shifted symbols, wherein the phase shifter module comprises a plurality of phase shifters and wherein each phase shifter of the plurality of phase shifters receives an assigned symbol of the plurality of assigned symbols associated with user data and shifts a phase of the assigned symbol to produce a phase shifted symbol; a transformer that receives the plurality of phase shifted symbols that are associated with the user data, receives the plurality of assigned, non-shifted symbols that are associated with pilot data, transforms each phase shifted symbol to a time domain subcarrier associated with the symbol's frequency sub-band to produce a plurality of modulated time domain subcarriers associated with the user data, and transforms each non-shifted symbol to a time domain subcarrier associated with the symbol's frequency sub-band to produce a plurality of modulated time domain subcarriers that are associated with pilot data; a parallel-to-serial converter that converts the plurality of modulated subcarriers produced by the transformer from a parallel form to a serial form to produce an output signal; and a transmitter section coupled to the signal processing unit that transmits the plurality of phase shifted symbols via a wireless link.