Comb-form spectrum communication systems using repeated complementary sequence modulation
US6954422B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/16
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In comb-form spectrum communication systems using repeated complementary sequence modulation, a transmitting signal is constituted by assigning one set of N auto-complementary sequences to each user, where N is an integer equal to or higher than 2, and by transforming the N sequences to N repeated signals which have comb-form spectra without overlapping in frequency with one another with a method of repeating each sequence of the set of auto-complementary sequences a plurality of times, and by assigning the N complementary sequences with auto-complementary sequence characteristics to the N comb-form spectra. Thus, the near-far problem is solved by making the cross-correlation between a signal input to a user's station but addressed to another station and the user's reference code sequence, zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.