Methods and apparatus for improving minimum Hamming weights of a sequence
US7218255B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2003 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Jun 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A communications channel includes a buffer that receives symbols of user data including a plurality of M-bit symbols. A seed selector receives the M-bit symbols of the user data, selectively removes symbols of the user data from a seed set, and selects a scrambling seed from symbols remaining in the seed set. A scrambling device that communicates with the seed selector and the data buffer generates scrambled user data using the user data and the selected scrambling seed. A Hamming weight coding device determines a Hamming weight of symbols of the scrambled user data and selectively codes the symbols depending upon the determined Hamming weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.