Patent ID: 7983141

Claim:
A remote service unit for a multiple access OFDM communication system, the remote service unit comprising: a transceiver for receiving an OFDM waveform, the OFDM waveform having references signals distributed throughout, the references signals for adjusting demodulation of the OFDM waveform; an FFT engine coupled to the transceiver, the FFT engine producing frequency domain data samples representing information carried by the OFDM waveform; an FFT engine coupled to the transceiver, the FFT engine producing time domain data samples representing upstream information for transmission by the transceiver on a subset of orthogonal carriers of the OFDM waveform; a mapper that that receives payload data mapped onto an in-phase (I) and quadrature-phase (Q) constellation based on an output from the FFT engine, wherein the mapper maps said payload data into a at least one baseband payload signal; and a controller that receives reference data based on at least one of the reference signals, wherein the controller makes adjustments for demodulating the payload data based on the reference data.