Method for transmitting two parallel channels using code division and an apparatus realizing the method

CAFC
  • US 6,266,321 B1
  • Filed: 05/28/1998
  • Issued: 07/24/2001
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Term
First Claim
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1. A communications device for the simultaneous transmission of data related to a first channel and data related to a second channel using code division, comprising:

  • first spreading means for spreading data related to the first channel using a predetermined first spreading code, second spreading means for spreading said data related to the first channel using a predetermined second spreading code, third spreading means for spreading data related to the second channel using said first spreading code, fourth spreading means for spreading said data related to the second channel using said second spreading code, means for changing the power level of a signal representing the data related to the second channel after the spreading with respect to the power level of a signal representing the data related to the first channel after the spreading, and combiner means to compile a transmission from spread data related to the first channel and spread data related to the second channel the power level of which has been changed, said combiner means comprising;

    means for calculating the difference between data related to a first channel spread with a first spreading code, and data related to a second channel, spread with a second spreading code and the power level of which has been changed, and means for calculating the sum of data related to the first channel, spread with the second spreading code, and data related to the second channel, spread with the first spreading code and the power level of which has been changed.

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