APPARATUS AND METHOD FOR SYMBOL ALIGNMENT IN A MULTI-POINT OFDM/DMT DIGITAL COMMUNICATIONS SYSTEM
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United States of America Patent
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app pub date -
Jul 18, 2013
filing date -
Aug 22, 1996
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Abandoned
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Abstract
A multi-point communications system is set forth herein. The communications system comprises a head end unit disposed at a primary site and a plurality of receivers disposed at remote sites. The head end unit includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are transmitted in periodically occurring formatted symbol frames. The cyclic prefix includes a predetermined periodic signal superimposed thereon. The receivers receive the OFDM/DMT symbols over a subset of the predetermined number of bins from the transmission medium and use the superimposed signals to attain symbol alignment. As such, the receivers are designed to process substantially fewer bins than the entire number of bins transmitted by the head end unit.
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