Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-02-21
2006-02-21
Orgad, Edan (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S456100, C342S465000
Reexamination Certificate
active
07003325
ABSTRACT:
Signals received from mobile station by respective slave units each are attenuated by a combination of attenuation factors set for the respective slave units, the attenuated signals thereafter are combined into a resultant signal in master unit, and the combination of attenuation factors is changed based on a predetermined rule. Then information about magnitudes of powers of signals received from the mobile station by the respective slave units is acquired based on change of information about a power of the resultant signal occurring with change in the combination of attenuation factors. At this time, the signal received from the mobile station by each slave unit increases its power with decreasing distance of the slave unit to the mobile station; therefore, distances from the mobile station to the respective slave units are estimated based on the information about the magnitudes of the powers, and the location of the mobile station is suitably estimated thereby.
REFERENCES:
patent: 6643526 (2003-11-01), Katz
Hightower, Borriello, Location Systems for Ubiquitous Computing, Computer, vol. 34, Issue 8, Aug. 2001, pp. 57-66 (IEEE).
Hightower, Borriello, Spoton: An Indoor 3D Location Sensing Technology Based on RF Signal Strenght, UW CSE Technical Report #2000-02-02, Feb. 18, 2000.
Imai Tetsuro
Matsuki Hideo
Matsutani Hideyuki
NTT DoCoMo Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Orgad Edan
Sobutka Philip J.
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