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Transmitter and method for transmitting soft pilot symbols in a digital communication system

  • US 8,750,407 B2
  • Filed: 09/29/2008
  • Issued: 06/10/2014
  • Est. Priority Date: 06/17/2008
  • Status: Active Grant
First Claim
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1. A method of channel coding a radio signal for a High Speed Downlink Shared Channel (HS-DSCH) radio channel utilizing 16 QAM channel coding, wherein the method is performed in an I-Q coordinate system having an In-phase dimension and a Quadrature dimension, said method comprising the steps of:

  • channel interleaving the HS-DSCH radio signal; and

    inserting soft pilot symbols selected from a 16 QAM constellation by low-level puncturing of channel coded bits to provide the soft pilot symbols with constant amplitude in only one dimension in the I-Q coordinate system, wherein the low-level puncturing includes one of the following;

    providing constant Quadrature amplitude by replacing the punctured bits with known bit patterns having four bit labels in which a last bit label is fixed to a value of “

    1”

    ;

    orproviding constant In-phase amplitude by replacing the punctured bits with known bit patterns having four bit labels in which a third bit label is fixed to a value of “

    1”

    .

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