Multiplex communications – Wide area network – Packet switching
Patent
1993-08-20
1995-03-21
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
370 76, 370121, H04J 114
Patent
active
054003229
ABSTRACT:
Allocations of bits per transmission symbol to subchannels in a transmission system using multicarrier modulation are updated in response to requests from a receiver to a transmitter of the system, each request identifying a carrier whose bit allocation can be increased and a carrier whose bit allocation can be decreased, so that the total number of bits per symbol can be increased, decreased, or be unchanged. In order to synchronize bit allocation changes, a transmitted symbol counter at the transmitter and a received symbol counter at the receiver maintain synchronized symbol counts. In response to a request for a change in bit allocations, the transmitter sends a future symbol count value to the receiver, and the transmitter and the receiver implement the change when their respective counters match this count value.
REFERENCES:
patent: 5023869 (1991-06-01), Grover et al.
patent: 5293401 (1994-03-01), Serfaty
Bingham, J., "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come," IEEE Communications Magazine, vol. 28, No. 5, pp. 5-14 (May 1990).
Fleming, S. et al., ADSL: "The On-Ramp to the Information Highway", Telephony, pp. 20-26 (Jul. 12, 1993).
Chow Peter S.
Hunt Ronald R.
Amati Communications Corp.
Marcelo Melvin
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