Parameter measuring apparatus for digital quadrature modulation signals
US5946359A · kind A · utility
34Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An input quadrature modulation signal which is converted into a digital signal is converted into a complex baseband signal in a converter 7. A rough estimation of parameters of the signal is made in a rough signal correction unit 51. Using the estimates, the complex baseband signal is corrected. Utilizing a data detection of the corrected signal, a reference signal which corresponds to a transmitted signal is formed from the detected data in a generator 52. The reference signal and the corrected signal are used to estimate parameters in a fine parameter estimation unit 23.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.