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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Jun 16, 2009
Grant Date -
Feb 14, 2008
app pub date -
Oct 26, 2007
filing date -
Feb 6, 1995
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Abstract
Systems and methods for round-trip-delay adjustment in a multipoint-to-point orthogonal frequency division multiplexing () system are provided. In one embodiment, a method for a remote unit to request bandwidth in an Orthogonal Frequency Division Multiplexing () multi-point to point system comprises: transmitting a signal from a remote unit having a request for bandwidth to a host unit on a first tone, the signal from the remote unit configured to combine with a signal from at least one other remote unit on a different tone to form a coherent waveform; determining when a collision has occurred on the first tone between the signal transmitted by the remote unit and a signal from at least one other remote unit; and when a collision occurs, re-transmitting the request for bandwidth on the first tone.
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