Processing for improved performance and reduced pilot
US6366607B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1998 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | May 14, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital spread spectrum communication system employing pilot-aided coherent multipath demodulation effects a substantial reduction in global-pilot and assigned-pilot overheads. The system and method uses a QPSK-modulated data signal whereby the modulated data is removed and the recovered carrier is used for channel amplitude and phase estimation. The resulting signal has no data modulation and is used as a pseudo-pilot signal. In conjunction with the pseudo-pilot signal, a multiple-input phase-locked loop is employed further eliminating errors due to carrier-offset by using a plurality of pseudo-pilot signals. A pilot signal is required to resolve absolute phase ambiguity, but at a greatly reduced magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.