Pre-cursor inter-symbol interference cancellation
US7177352B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2005 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Sep 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03617
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for canceling pre-cursor inter-symbol interference (ISI) are disclosed. In a digital communication system, a significant amount of noise can be attributed to the pre-cursor portion of the ISI. In a receiver, it can be relatively difficult to compensate for pre-cursor ISI in part because pre-cursor ISI is a result of one or more symbols that have yet to arrive at the receiver. One embodiment removes a portion of this ISI by using multiple detection thresholds in parallel. For example, data slicing (generation of a hard decision) can include three thresholds. These thresholds for slicing include a positive offset, a negative offset and no offset. The positive and negative offsets can correspond to the expected pre-cursor component of the data channel for which the data is transmitted or to a fraction thereof. The path with the correctly-compensated ISI is selected later.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.