Data processing apparatus and method for d=2 optical channels
US7079467B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2001 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Dec 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1461
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data processing apparatus having a partial response forward equalizer (filter) with sufficient number of taps to result in 7-tap target response, designed by jointly optimizing the target response and the target coefficients to maximize an appropriate signal-to-noise ratio (SNR) at the detector input, followed by a new post-processing scheme enhances performance of the threshold based bit-by-bit detector designed for the d=2 optical channels. The resulting performance of the proposed scheme over a range of channel densities of 4.5 and below (used on EFM/EFMPlus coded channels for CD/DVD), is close to maximum-likelihood bound (MLB), and it is better than that of other schemes at channel densities of 4.5 and higher. Advantageously, the detector of the invention is simple in structure compared to conventional partial response Viterbi detector schemes. By processing the detected data in accordance with a set of data correction rules, the invention provides advantageous enhanced detection capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.