Communications system employing orthogonal frequency division multiplexing based spread sprectrum multiple access
US6553019B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1999 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Dec 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7136
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Tone sequences in a frequency hopping arrangement are generated and assigned by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and assign them on a time slot by time slot basis. In a transmitter, the sequence generator and sequence assignor, in combination with a user tone assignor are employed to generate and assign tone sequences to a user on a time slot by time slot basis. In a receiver, the sequence generator and sequence assignor, in combination with a user tone identifier are employed to generate sequences and to identify incoming tone sequences to a user on a time slot by time slot basis. Specifically, the sequence assignment in a time slot is such that a prescribed plurality of sequences is assigned to a particular user. This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor. The sequence assignor functions in such a manner that the interference and frequency diversity properties for the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.