Apparatus and method for filtering a spectrum spread communication
US7411997B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 26, 2002 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Apr 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A filter (201) accepts spreading code sequences or the like as input sequences of a chip rate 1/D, the accepted spreading code sequences are sequentially delayed and distributed by delay circuits (202) connected in series, delay times of individual signals are an arithmetical progression with a chip length D being a common difference D, the individual signals are amplified with spreading codes by amplifiers (203), amplification factors for the individual signals are a geometrical progression of a common ratio r, the sum of the amplified signals is obtained by addition in an adder (204), and the result is sequentially output as an output sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.