Velocity estimation apparatus and method using level...

Details Velocity estimation apparatus and method using level... Velocity estimation apparatus and method using level...

2006-10-10

2006-10-10

Feild, Joseph (Department: 2681)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S553100, C455S130000, C455S067110, C455S136000, C375S130000, C375S285000, C375S222000, C600S454000, C702S142000

Reexamination Certificate

active

07120440

ABSTRACT:
Disclosed is a velocity estimator using a level crossing rate. The velocity estimator comprises a power calculator for calculating power values of a signal received from a mobile terminal; a mean power calculator for calculating mean power values for M power values according to a predetermined down-sampling factor M; an interpolator for interpolating the mean power values according to a predetermined interpolation ratio L; a root mean square calculator for calculating a root mean square value using an output of the interpolator; a level crossing counter for counting a level crossing frequency representing how many times the output of the interpolator crosses a level crossing threshold determined according to the root mean square value, for a predetermined time period; and a velocity calculator for calculating a velocity estimation value of the mobile terminal using the level crossing frequency.

REFERENCES:
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patent: 5825807 (1998-10-01), Kumar
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patent: 6529850 (2003-03-01), Wilborn et al.
patent: 2002/0138229 (2002-09-01), Wilborn et al.
patent: 2005/0020219 (2005-01-01), Sih et al.
patent: WO 01/99303 (2001-12-01), None
patent: WO 03/036813 (2003-05-01), None

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