Cellular/satellite communications system with improved frequency re-use

  • US 5,631,898 A
  • Filed: 05/16/1995
  • Issued: 05/20/1997
  • Est. Priority Date: 01/11/1994
  • Status: Expired due to Term
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First Claim
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1. A method for transmitting signals to a plurality of remote units comprising the steps of:

  • correlating a signal received from a new remote unit during random access transmission with a plurality of individual antenna beam element signals to determine a new column of coefficients for a receive matrix;

    determining a new inverse C-matrix for receiving traffic from the new remote unit based on an old inverse C-matrix and the new column;

    transforming the new column to a new transmit C-matrix row by scaling relative coefficient phase angles using a ratio of up- to down-link frequencies;

    determining a new transmit inverse C-matrix based on an old transmit inverse C-matrix and the new transmit C-matrix row, andtransmitting signals to said remote units using said new transmit inverse C-matrix.

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