Synchronization techniques in multipoint-to-point communication using orthogonal frequency division multiplexing
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United States of America Patent
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Sep 2, 2008
Grant Date -
Dec 27, 2007
app pub date -
Sep 13, 2007
filing date -
Feb 6, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A bidirectional communication system is provided. In one embodiment, a system comprises a host unit and a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency division multiplexing (OFDM). The host unit repeatedly performs an analysis of a transmission characteristic of at least one upstream signal from at least one remote unit. The at least one remote unit makes adjustments to the transmission characteristic based on the analyses performed by the host unit to assist the host unit in demodulating a plurality of upstream signals from the plurality of remote units.
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