Unipolar spread spectrum modulation for low computation and power cost signal multiplexing with application to fNIRS measurments
US8693526B2 · kind B2 · utility
0Cited by
7References
20Claims
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Key dates
| Filing date | Feb 16, 2012 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Feb 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention teaches a way to multiplex and de-multiplex unipolar signals using spread spectrum methods. While bipolar spread spectrum signal multiplexing may be used in may applications, for example for systems using radio signals, when using unipolar signals there is a loss of orthogonally which makes the standard algorithms unworkable. This invention teaches a method to recover orthogonally and make spread spectrum multiplexing useful for unipolar signals. One example is in the measurement of optical absorbance along multiple paths simultaneously using light signals, as for functional near infrared spectroscopy (fNIRS).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.