Methods and devices for improving the performance of wireless devices using speed and noise metrics
US6757547B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | May 5, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/20
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The performance of wireless devices is improved using methods and devices which comprise novel SPEED and NOISE metrics. The SPEED metric is generated from a mean value of a differential signal while the NOISE metric is generated from a variance value of a differential signal. The generation of both metrics assumes the use of a limited number of symbols used to generate the mean and variance values. One example of a signal used to generate the metrics comprises the 14 synchronization symbols which make up part of an IS-136 standard signal. The SPEED metric was discovered to comprise a value which is equal to the magnitude of the mean value of the differential signal while the NOISE metric was discovered to comprise a value which is approximately equal to twice the variance of noise in a received baseband signal, while at the same time being independent of the speed at which an object, such as a wireless device, moves. In the case where a Least Mean Square (“LMS”) method is used to estimate channel fading in a flat-faded channel, it was discovered that the logarithm of a ratio of the SPEED metric to the NOISE metric as plotted against optimum step sizes is a substantially…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.