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SOFT HANDOFF FOR OFDM

  • US 20090103494A1
  • Filed: 12/24/2008
  • Published: 04/23/2009
  • Est. Priority Date: 03/22/2002
  • Status: Active Grant
First Claim
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1. An orthogonal frequency division multiplexing (OFDM) system comprising:

  • a) a base station controller adapted to schedule data for a mobile terminal during a soft handoff mode and deliver at least a portion of scheduled data for the mobile terminal to at least one of a plurality of base stations; and

    b) the plurality of base stations operatively associated with the base station controller, each base station participating in the soft handoff adapted to;

    i) receive the scheduled data for delivery to the mobile terminal;

    ii) provide space-time coding for the scheduled data to generate a plurality of space-time coded signals;

    iii) perform an Inverse Fourier Transform (IFT) on each of the plurality of space-time coded signals to generate a plurality of OFDM signals, each of the plurality of space-time coded signals configured to result in corresponding OFDM signals mapped into defined sub-bands in an OFDM spectrum of sub-bands, the defined sub-bands not used by other ones of the base stations participating in the soft handoff; and

    iv) transmit the plurality of OFDM signals with spatial diversity for reception by the mobile terminal.

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