Spread-spectrum receiver with progressive fourier transform
US8594153B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2007 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Jan 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0023
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiving system dynamically searches the communications band for transmissions of messages having the same nominal communications parameters, including the use of the same spreading code, but having potentially different specific frequencies and code-phases. The receiver, which is independent of the transmitters, samples the communications band at each code-phase of the spreading code over a span of downconverted transmission frequencies. When a message element is detected at a particular code-phase and frequency, it is forwarded to a demodulator that demodulates the message and sends it to its intended destination. In a preferred embodiment, a progressive Fourier Transform is used to incrementally determine the power level at each successive code-phase at a given frequency, thereby substantially reducing the time required to search for transmissions at each discrete code-phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.