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Spreading and precoding in OFDM

  • US 10,230,559 B1
  • Filed: 07/02/2018
  • Issued: 03/12/2019
  • Est. Priority Date: 05/14/2002
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a processor; and

    a non-transitory computer-readable memory communicatively coupled to the processor, the memory including a set of instructions stored thereon and executable by the processor for;

    spreading a plurality of data symbols with a plurality of orthogonal spreading codes comprising complex-valued coefficients of a discrete Fourier transform (DFT) to produce a plurality of spread symbols;

    responsive to an assignment of spectrum resources for use by a transmitter in an orthogonal frequency division multiplexing (OFDM) network, selecting a plurality of OFDM subcarriers corresponding to at least one OFDM symbol interval; and

    generating an OFDM signal comprising a superposition of the plurality of OFDM subcarriers, each modulated by one of the plurality of spread symbols, wherein the plurality of orthogonal spreading codes are selected to provide the superposition with a reduced peak-to-average-power ratio;

    wherein at least one of the plurality of spread symbols is expressed by;

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