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Timing and symbol alignment in multipoint-to-point communication using orthogonal frequency division multiplexing

  • US 7,912,138 B2
  • Filed: 02/26/2007
  • Issued: 03/22/2011
  • Est. Priority Date: 02/06/1995
  • Status: Expired due to Fees
First Claim
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1. A method for quality based allocation of orthogonal channels for remote service units of an orthogonal frequency division multiplexing (OFDM) based multiple access system, the method comprising:

  • determining a channel quality measurement for a first portion of an OFDM waveform, said first portion comprising less than all the payload bearing orthogonal tones within the waveform;

    determining a channel quality measurement for a second portion of the OFDM waveform different than the first portion, said second portion comprising less than all the payload bearing orthogonal tones within the waveform; and

    receiving an allocation of only a portion of upstream orthogonal tones, said allocation based at least in part on the channel quality measurements for said first and second portions;

    receiving frequency and timing adjustment information for maintaining orthogonality of the upstream orthogonal tones.

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