Bidirectional point to multipoint network using multicarrier modulation
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United States of America Patent
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Jul 18, 2000
Grant Date -
N/A
app pub date -
May 11, 1998
filing date -
May 20, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-way point to multipoint data transmission system comprises an upstream unit, a plurality of downstream units, and a transmission line connecting the downstream units to the upstream unit. At least one headend modem is located at the upstream unit and at least one downstream modem is located at the downstream units. The modems employ multitone orthogonal frequency division multiplexing (OFDM) to establish two-way communication between the upstream and downstream units. The OFDM has a tone spacing selected to minimize the ingress of electromagnetic interference at least in the upstream direction.
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