Pseudo-random number sequence filter, filtering method and data recording medium
US7466780B2 · kind B2 · utility
1Cited by
8References
5Claims
0Family size
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Key dates
| Filing date | Jul 24, 2006 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Sep 8, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/0018
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An FIR filter for filtering a prescribed real impulse constant (r) (−1<r<1) receives in a terminal the input of the input signal of the Chebyshev-chaos type spreading code sequence having a chip length D. A plurality of signals obtained by delaying the input signals by 0, D, 2D, 3D, . . . , and (N−1)D are output by a delay circuit. When the delay time is T, a plurality of delayed and output signals are multiplied by (−r)N−T/D with an amplifier and output, and the sum of a plurality of amplified and output signals, namely an optimum chaos-type spreading code string, is output by an adder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.