System and method for contention based tones in a multipoint-to-point orthogonal frequency division multiplexing system
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United States of America Patent
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Jul 15, 2008
Grant Date -
Feb 7, 2008
app pub date -
Oct 24, 2007
filing date -
Feb 6, 1995
priority date (Note) -
Expired
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Abstract
Systems and methods for contention based tones in a multipoint-to-point orthogonal frequency division multiplexing system are provided. In one embodiment, a multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system comprises: a host unit; a plurality of remote units that access the host unit using an orthogonal frequency division multiple access scheme; wherein each of the remote units modulates upstream information into an OFDM signal modulated using a Fourier transform; wherein the host unit receives upstream OFDM signals from a plurality of the remote units, wherein portions of the upstream OFDM signals arrive at the host unit at the same time; wherein a first remote unit transmits a first upstream signal to the host unit on a first orthogonal tone; and wherein the first remote unit retransmits the first upstream signal to the host unit in the event a collision occurs on the first orthogonal tone.
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