Method for determining reference phase in radio communication system which uses orthogonal M-ary modulation, and coherent detection method using the same
US6414985B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/70935
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Reference phase is a radio communication system using orthogonal M-ary modulation is determined, so that a coherent detection system for a CDMA radio communication system is readily achieved. The determination of reference phase is performed by the step of determining a reference phase in a radio communication system, which uses orthogonal M-ary codes comprising the steps of determining the correlation values of an in-phase component and quadrature component corresponding to respective Hadamard matrices resulting from fast Hadamard transform or inverse Hadamard transform of a signal, which possesses said in-phase component and quadrature component, and which is sent from the sending end by phase shift keying an orthogonal M-ary code computing the sum of the squares of the respective correlation values of said in-phase component and quadrature component and selecting either said fast Hadamard transform or inverse Hadamard transform output, which outputs a maximum value of said computed sum of the squares.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.