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OFDM transmission/reception system and transmitting/receiving apparatus

  • US 5,694,389 A
  • Filed: 02/22/1996
  • Issued: 12/02/1997
  • Est. Priority Date: 02/24/1995
  • Status: Expired due to Fees
First Claim
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1. An orthogonal frequency division multiplexing (OFDM) transmission/reception system comprising:

  • transmission means for;

    setting some or all of a plurality of equidistant carrier positions as reference carrier positions;

    assigning actual transmitted carriers on those of said reference carrier positions which are located in a predetermined non-equidistant pattern to yield an OFDM symbol; and

    periodically transmitting said OFDM symbol as frequency reference symbols; and

    receiver means for;

    detecting said frequency reference symbols as a carrier reception pattern by detecting whether carriers exist or not at said reference carrier positions;

    detecting a carrier frequency offset based on a difference between said reception pattern and a transmission pattern; and

    compensating for frequencies of carriers in accordance with said carrier frequency offset.

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