Method of determining a collision between a plurality of transmitting stations in a frame-based communications network
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United States of America Patent
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May 24, 2005
Grant Date -
Dec 27, 2001
app pub date -
Apr 4, 2001
filing date -
Apr 7, 2000
priority date (Note) -
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Abstract
A method of determining a collision between two or more transmitting stations at one of the transmitting stations on a frame-based communications network. A transmitted frame header includes a cyclic preamble wherein identical copies of a preamble symbol sequence are transmitted sequentially. A collision is declared if an estimate of error power in second and third copies of the preamble minus an estimate of error power in third and fourth copies of the preamble exceeds a first threshold, or a maximum value of the norm of each term of a source field error vector minus a greater of the estimate of the error power in the second and third copies of the cyclic preamble and the estimate of the error power in the third and fourth copies of the preamble exceeds a second threshold.
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