Mitigation of CDMA cross-correlation artifacts and improvement in signal-to-noise ratio in TDMA location networks
US7463617B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 3, 2004 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Aug 12, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/70706
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A correlation system for Time Division Multiple Access (TDMA) positioning systems is disclosed, whereby a position receiver acquires, tracks, and demodulates a plurality of Code Division Multiple Access (CDMA) modulated positioning signals are pulsed in a Time Division Multiple Access (TDMA) scheme. A specialized correlation processor within the position receiver is configured to internally generate pseudo-random number (PRN) code signal replicas of Code Division Multiple Access (CDMA) positioning signals in synchronicity with their respectively received Time Division Multiple Access (TDMA) positioning signals. This correlation system provides the position receiver with range measurements free from the deleterious effects of Code Division Multiple Access (CDMA) cross-correlation artifacts and degraded signal-to-noise ratios, therefore allowing the computation of high accuracy position solutions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.