Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1997-02-24
1998-07-28
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
H04B 7185, G01S 502
Patent
active
057867917
ABSTRACT:
Location of a remote unit within a wireless communication system is determined by utilizing an Amplitude Difference-based Angle Of Arrival estimation (AD-AOA). In particular, a prompt ray (401) from a signal (117) having undergone multi-path scattering is received at multiple antennas (103 and 105). The prompt rays (401) received at each antenna are combined by a signal combiner and averager (307). The signal combiner and averager (307) then averages the energy of the summed prompt ray over multiple power control groups to determine an accurate energy level for the summed prompt ray. The averaged energy value for the summed prompt ray is then output to an AOA computer (309), along with the average energy value for summed prompt rays at other sectors. The energy values for the summed prompt rays received from each sector are analyzed to determine an appropriate angle of arrival.
REFERENCES:
patent: 4334185 (1982-06-01), Turney et al.
patent: 4636796 (1987-01-01), Imazeki
patent: 4833478 (1989-05-01), Nossen
patent: 5334984 (1994-08-01), Akaba
patent: 5444451 (1995-08-01), Johnson et al.
patent: 5592181 (1997-01-01), Cai et al.
Blum Theodore M.
Haas Kenneth A.
Motorola Inc.
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