PCM upstream data transmission server
US7321618B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 2002 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Jul 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03363
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for designing an equalizer and tracking performance for upstream PCM in a digital communications network is described. The invention optimizes upstream data rate rates for data transmissions in a network between a client modem a server modem. During training, the upstream channel impulse response is identified compensating for any robbed bit signalling. The upstream transmit equalizer is computed in closed form based on the identified channel. An equalizer in the receiver is also used to track timing and channel variations. The invention approximates bit error rate performance by looking for code violations in the trellis code decoder and tracking their frequency. The bit error rate is used to determine if the current modem parameters need to be re-designed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.