Two-phase/four-phase modulated comb-shaped spread spectrum communication system
US6421367B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J2013/0037
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
When communications are performed between a transmitter 2 and a receiver 3 via a transmission path 4, the transmitter prepares a basic sequence consisting of two-phase or four-phase tips, and transmits an expanded transmission frame which is constructed by repeatedly arranging one or a plurality of the basic sequence so as to obtain a finite length periodic sequence with a comb-form spectrum and by adding the replica of one or a plurality of tips of a back portion and front portion of the finite length periodic sequence to the outside of the front portion and the outside of the back portion of the finite length periodic sequence; and the receiver demodulates the expanded transmission frame using a matched filter which is matched with the finite length periodic sequence which is the central part of the expanded transmission frame, that is not including the added tips. In other words, the present invention can simplify the construction of communication equipment by using two-phase signals or four-phase signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.