| US 7,577,445 B2 | ||
| Line-of-sight (LOS) or non-LOS (NLOS) identification method using multipath channel statistics | ||
| Ismail Guvenc, Santa Clara, Calif. (US); and Chia-Chin Chong, Santa Clara, Calif. (US) | ||
| Assigned to NTT DoCoMo, Inc., Tokyo (Japan) | ||
| Filed on Aug. 01, 2007, as Appl. No. 11/832,551. | ||
| Claims priority of provisional application 60/822127, filed on Aug. 11, 2006. | ||
| Claims priority of provisional application 60/821378, filed on Aug. 03, 2006. | ||
| Prior Publication US 2008/0032709 A1, Feb. 07, 2008 | ||
| Int. Cl. H04Q 7/20 (2006.01) | ||
| U.S. Cl. 455—456.2 [455/456.5; 455/506; 455/67.11; 455/67.16] | 13 Claims |
| 1. A method for identifying line-of-sight (LOS) and non-line-of-sight (NLOS) conditions in a received ultra-wideband signal,
comprising:
calculating a statistical quantity of the received signal based on delays and amplitudes of one or more multipath components
of the received signal;
setting up a hypothesis test based on the probability density functions of the statistical quantity for the LOS and NLOS conditions;
and
applying the calculated statistical quantity to the hypothesis test to determine whether the received signal is LOS or NLOS.
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