Adaptive error slicer and residual intersymbol interference estimator
US7764732B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03681
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Conventional adaptive equalizers often use the “sign/sign” algorithm as a low complexity means to adjust their tap weight coefficients by driving the correlation between its single-bit “error” and “data” signals to zero. This algorithm fails in the presence of strong residual intersymbol interference (ISI), since this ISI renders the “error” signal sufficiently inaccurate to mask the correlation between “data” and “error”. Failure manifests itself two-fold as an inability to achieve tap weight acquisition at startup, and an inability to track dynamic channel conditions. The invention described herein employs an adaptive estimator to compute the residual masking ISI terms that in turn control an adaptive error slicer to synthesize a modified single-bit “error” signal that remains correlated with the “data” signal. By restoring this correlation between “error” and “data” using these two modifications, the “sign/sign” algorithm retains its acquisition and tracking capabilities in the presence of strong residual ISI.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.