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Multipoint-to-point communication using orthogonal frequency division multiplexing

DC
  • US 7,672,219 B2
  • Filed: 02/06/2007
  • Issued: 03/02/2010
  • Est. Priority Date: 02/06/1995
  • Status: Expired due to Fees
First Claim
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1. A remote communication device for operation in a bidirectional communication system, the device comprising:

  • at least one symbol mapper for mapping symbols using quadrature amplitude modulation (QAM) symbol mapping and phase-shift keying (PSK) symbol mapping;

    a Fast Fourier Transform (FFT) engine that receives a frame of parallel data based on symbol data generated by the symbol mapper, the Fast Fourier Transform (FFT) engine generating a frame of time domain in-phase and quadrature phase data from the symbol data generated by the symbol mapper;

    at least one converter generating an analog signal based on the stream of time domain in-phase and quadrature phase data;

    a radio frequency transmitter for transmitting a radio frequency signal based on the analog signal; and

    a processor, wherein the symbol mapper is responsive to the processor, and the processor controls synchronization of symbol timing and carrier frequency of transmissions from the radio frequency transmitter.

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