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SYSTEM, METHOD AND APPARATUS FOR MOBILE TRANSMIT DIVERSITY USING SYMMETRIC PHASE DIFFERENCE

  • US 20100266063A1
  • Filed: 04/23/2010
  • Published: 10/21/2010
  • Est. Priority Date: 05/09/2002
  • Status: Active Grant
First Claim
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1. A mobile communication device comprising:

  • a processor to produce a data signal and a value of a transmit diversity parameter;

    a vector modulator to produce first and second signals based on said data signal, said first signal differing from second signal based on said value of the transmit diversity parameter;

    first and second antennas to transmit said first and second signals, respectively,wherein said mobile communication device is to receive from a receiving communication device a signal quality indication pertaining to quality of the combined first and second signals as received at the receiving communication device,wherein said processor is to determine based at least on said signal quality indication a modified value of said transmit diversity parameter,wherein said vector modulator is to produce said first and second modified signals, said first modified signal differing from said second modified signal based on said modified value of the transmit diversity parameter, wherein said vector modulator is to modify said first signal by modifying a transmission parameter thereof in a first direction, and wherein said vector modulator is to modify said second signal by modifying said transmission parameter thereof in a second direction, opposite to said first direction, andwherein said first and second antennas are to transmit said modified first and second signals, respectively.

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