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ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) COMMUNICATIONS DEVICE AND METHOD THAT INCORPORATES LOW PAPR PREAMBLE WITH CIRCUIT FOR MEASURING FREQUENCY RESPONSE OF THE COMMUNICATIONS CHANNEL

  • US 20100080312A1
  • Filed: 10/01/2008
  • Published: 04/01/2010
  • Est. Priority Date: 10/01/2008
  • Status: Active Grant
First Claim
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1. A communications device, comprising:

  • a demapping and demodulation circuit for processing an OFDM communications signal that had been transmitted along a communications channel, wherein the OFDM communications signal comprises modulated subcarriers carrying communications data forming a data payload and modulated subcarriers carrying a training sequence forming a preamble, wherein the OFDM subcarriers carrying the training sequence have a sample for each subcarrier at a center of a frequency bin using evenly spaced, equal amplitude subcarriers that have a set phase of each sinusoid to a specific angle with quadratic phase to form a low peak-to-average power ratio (PAPR) preamble with about a PAPR value of 2.6 decibels (dB); and

    a channel estimate circuit operative for measuring fluctuations within a flat-topped spectrum of the received OFDM communications signal corresponding to the preamble to reflect the frequency response of the communications channel.

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