Communications system that reduces auto-correlation or cross-correlation in weak signals
US6680695B2 · kind B2 · utility
119Cited by
92References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2001 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Jul 20, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70715
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data paths that allow standard correlation of signals in parallel with verification of the lock signal to determine whether the system has locked onto the proper signal within the scanned signal window. The invention can be made with multiple CPUs, a single CPU with dual input modes, on multiple IC chips, or as a single IC chip solution for small, low cost reception, downconversion, correlation, and verification systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.