Ronald J Hunt

US Patent:

54003229, Mar 21, 1995

Filed:

Aug 20, 1993

Appl. No.:

8/109489

Inventors:

Ronald R. Hunt - San Jose CA
Peter S. Chow - Mountain View CA

Assignee:

Amati Communications Corp. - Mountain View CA

International Classification:

H04J 114

US Classification:

370 19

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.