Line-of-sight (LOS) or non-LOS (NLOS) identification method using multipath channel statistics
US7577445B2 · kind B2 · utility
12Cited by
4References
13Claims
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Key dates
| Filing date | Aug 1, 2007 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Aug 1, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Non-line-of-sight (NLOS) identification and mitigation are carried out in a wireless positioning system based on channel statistics derived from multipath components of a received signal. The statistics may be based on the kurtosis, the mean excess delay spread, or the root mean square delay spread. The results are justified using IEEE 802.15.4a ultrawideband channel models. Amplitude and delay statistics based on the IEEE models are shown to be log-normal random variables. A joint likelihood ratio test is presented for the LOS and NLOS identification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.