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Apparatus and method for measuring signal quality of a wireless communications link

  • US 7,016,651 B1
  • Filed: 12/17/2002
  • Issued: 03/21/2006
  • Est. Priority Date: 12/17/2002
  • Status: Active Grant
First Claim
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1. An apparatus for measuring signal quality in a communications link, the communications link capable of supporting transfer of OFDM symbols modulating data across a plurality of sub-carriers, the apparatus comprising:

  • a link interface to receive an OFDM symbol from the communications link; and

    a signal-to-noise ratio estimation unit to generate an estimate of a geometric signal-to-noise ratio for the OFDM symbol based on an average of a logarithmic difference between a soft decision and a hard decision for the OFDM symbol, the geometric signal-to-noise ratio estimate defining a scalar value of the communications link signal quality.

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