Spectrum diffusion signal analyzer and method of analyzing diffusion signal
US6552995B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1999 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Feb 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
According to the present invention, the inputted spectrum diffusion signal is orthogonal-transformed (16), and then, the common mode output Zre and the orthogonal mode output Zim are respectively AD-transformed (23, 24). Zre and Zim are respectively inputted to series connections of delay units respectively having a sampling period, and the corresponding delayed outputs are complex-multiplied (20i). Each output is N-points-complex-Fast-Fourier-transformed, and the absolute value of the each coefficient is squared. The squared absolute value is two-dimensionally displayed by setting a horizontal axis as a frequency axis and a longitudinal axis as a time axis (32). Then, a carrier wave frequency error is obtained from the maximum peak of the frequency, and a timing phase is obtained from the time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.