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FFT SPREADING AMONG SELECTED OFDM SUB-CARRIERS

  • US 20100061474A1
  • Filed: 05/03/2008
  • Published: 03/11/2010
  • Est. Priority Date: 05/04/2007
  • Status: Abandoned Application
First Claim
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1. An improved orthogonal frequency division multiplexing (OFDM) communications system, including an inverse fast Fourier transform (IFFT) device in a transmitter to form OFDM symbols, and a corresponding fast Fourier transform (FFT) device at a receiver for frequency-domain processing of a received signal, the improvement comprising:

  • a transmitter circuit in which data-bearing modulation symbols are spread across many OFDM sub-carriers using a discrete Fourier transform (FFT); and

    a receiver circuit that despreads said data-bearing modulation symbols using an inverse discrete Fourier transform (IFFT);

    wherein, bit-error-rate (BER) performance overall is improved.

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