System for channel capacity modulation

• US 5,475,711 A
• Filed: 09/14/1994
• Issued: 12/12/1995
• Est. Priority Date: 10/30/1992
• Status: Expired due to Term

• Current Assignee: Smart Link Limited
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Betts, William L., Zuranski, Edward S.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): VO, DON NGUYEN
• Application Number:
  US08/307,497
• Time in Patent Office: 454 Days
• Field of Search: 375/3.1, 375/7-10, 375/37, 375/121, 375/122, 370/13.1, 370/17
• US Class Current: 375/240
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001

Abstract

A method and apparatus for optimizing parameters selectable by an analog modem for operation on any bandwidth-constrained channel is provided. Through the addition of circuitry for performing an optimization process, the modem is configured for identifying the optimum bandwidth and maximum data rate for use over a selected bandwidth-constrained channel. In the process of optimizing the parameters for operation on the selected bandwidth-constrained channel, a measurement of the signal and noise spectrum present on the selected channel is determined. And from this measurement, the optimum bandwidth, maximum data rate for the transmission of data over the selected bandwidth-constrained channel and a modulus for performing a modulus conversion of the data for transmission are provided. The modem is then trained to operate using these optimized parameters for transmission of the data.

Claims