Symbol-energy-to-noise-density estimation in a QPSK modulated communication system
US6075815A · kind A · utility
9Cited by
6References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 17, 1997 |
| Grant date | Jun 13, 2000 |
| Priority date | — |
| Expiry date | Sep 17, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/40
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The process determines the I channel and Q channel components for each received soft value. The location of each soft value with respect to the fade line is determined using the I and Q channel components. These locations are averaged over a power control group duration to determine the noise density. The symbol energy is determined by subtracting the average perpendicular distance from the soft value point to the fade line from half the square of the average of the distance from the soft value point to the origin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.