Apparatus for coherent combining type demodulation in communication system and method thereof
US7586980B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 2004 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Dec 13, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70701
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed is an apparatus for coherent combining type demodulation and method thereof, in which a multi-path reception signal is demodulated by a coherent combining method in case that a transmitted signal, which was spread and modulated by such an orthogonal code as Walsh code, is received via multi-paths in the course of transmission and by which loss is more reduced than that of modulation of a non-coherent combining method. The modulation according to the coherent combining method needs a pilot signal. Yet, there exists no pilot signal on a reverse link of IS-95A. Hence, the present invention basically generates a phase reference signal or a decision directed pilot signal instead of the pilot signal to perform coherent combining using the phase reference signal or the decision directed phase signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.