USE OF GUARD BANDS IN MULTIPOINT-TO-POINT ORTHGONAL FREQUENCY DIVISION MULTIPLEXING COMMUNICATION
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United States of America Patent
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app pub date -
May 10, 2007
filing date -
Feb 6, 1995
priority date (Note) -
Abandoned
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Abstract
Systems for use of guard bands in multipoint-to-point orthgonal frequency division multiplexing communication are provided. In one embodiment, an orthogonal frequency division multiplexing (OFDM) system comprises: a host unit; a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using OFDM; and wherein when at least one tone within the OFDM system carries an upstream alignment signal from at least one remote unit to the host unit to assist in aligning at least one of frequency, timing, and amplitude of transmissions from the at least one remote unit to improve orthogonality of an OFDM waveform received at the host unit, the at least one tone is separated from payload bearing tones within the OFDM system by a guard band of frequency spectrum.
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