US5786791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining an angle of arrival of a signal transmitted by a remote unit in a communication system
Assignee: Google Technology Holdings LLC
•
Filing: 1997-02-24
•
Granted: 1998-07-28
•
Expires: 2017-02-24
Abstract
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.
Inventors
- 👤 Eugene J. Bruckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/04; G01S3/043; G01S3/14; G01S3/28; G01S3/30; G01S5/00; G01S5/02; G01S5/04; G01S1/00; G01S1/02; G01S1/04; G01S1/045
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A method for determining an angle of arrival of a remote unit in a Code Division, Multiple Access (CDMA) communication system, the method comprising the steps of: receiving an RF signal at a first antenna existing within a sectorized base site, the RF signal comprising a plurality of rays produced by undergoing multi-path scattering; receiving the RF signal at a second antenna existing within the sectorized base site; identifying a prompt ray from the plurality of rays received at the first antenna; identifying the prompt ray from the plurality of rays received at the second antenna; and determining the angle of arrival from the prompt ray received at the first and the second antenna.
Claim 2
Independent Claim
114 words
A method for determining an angle of arrival of a remote unit in a Code Division, Multiple Access (CDMA) communication system, the method comprising the steps of: receiving an RF signal at a first antenna existing within a sectorized base site, the RF signal comprising a plurality of rays produced by undergoing multi-path scattering; receiving the RF signal at a second antenna existing within the sectorized base site; identifying a prompt ray from the plurality of rays received at the first antenna; identifying the prompt ray from the plurality of rays received at the second antenna; and determining the angle of arrival from the prompt ray received at the first and the second antenna.
Claim 3
Dependent Claim
72 words
The method of claim 1 wherein the step of determining the angle of arrival comprises the steps of: determining an energy of the prompt ray identified at the first antenna; determining an energy of the prompt ray identified at the second antenna; and determining the angle of arrival from the energy of the prompt ray identified at the first antenna and the energy of the prompt ray identified at the second antenna.
Claim 4
Dependent Claim
31 words
The method of claim 2 wherein the step of determining the energy of the prompt ray comprises averaging the energy of the prompt ray over a plurality of power control groups.
Claim 5
Dependent Claim
51 words
The method of claim 2 wherein the step of determining an angle of arrival comprises the steps of determining the angle of arrival based on a ratio of the energy of the prompt ray identified at the first antenna to the energy of the prompt ray identified at the second antenna.
Claim 6
Dependent Claim
81 words
The method of claim 1 wherein the step of determining the angle of arrival comprises the steps of: determining a first energy of the prompt ray received at the first antenna; determining a second energy of the prompt ray received at the second antenna; determining an amplifier gain value; adjusting the first and the second energy of the prompt ray by the amplifier gain value; and determining the angle of arrival based on the adjusted first energy of the prompt ray.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the communication system is a code division, multiple access (CDMA) communication system.
Claim 8
Independent Claim
129 words
A method for determining an angle of arrival of a remote unit in a communication system, the method comprising the steps of: receiving an RF signal at a first antenna existing within a first sector of a sectorized base site, the RF signal comprising a plurality of rays; receiving the RF signal at a second antenna existing within the first sector of the sectorized base site; identifying a prompt ray from the plurality of rays received at the first antenna; identifying the prompt ray from the plurality of rays received at the second antenna; summing the prompt ray received at the first antenna with the prompt ray received at the second antenna to produce a summed prompt ray; and determining the angle of arrival from the summed prompt ray.
Claim 9
Independent Claim
129 words
A method for determining an angle of arrival of a remote unit in a communication system, the method comprising the steps of: receiving an RF signal at a first antenna existing within a first sector of a sectorized base site, the RF signal comprising a plurality of rays; receiving the RF signal at a second antenna existing within the first sector of the sectorized base site; identifying a prompt ray from the plurality of rays received at the first antenna; identifying the prompt ray from the plurality of rays received at the second antenna; summing the prompt ray received at the first antenna with the prompt ray received at the second antenna to produce a summed prompt ray; and determining the angle of arrival from the summed prompt ray.
Claim 10
Dependent Claim
76 words
The method of claim 7 wherein the step of determining the angle of arrival comprises the steps of: determining a first energy of the summed prompt ray; summing the prompt ray received at a third antenna with the prompt ray received at a fourth antenna to produce a second summed prompt ray; determining a second energy of the second summed prompt ray; and determining the angle of arrival from the first energy and the second energy.
Claim 11
Dependent Claim
34 words
The method of claim 8 wherein the step of determining the first energy of the summed prompt ray comprises averaging the energy of the summed prompt ray over a plurality of power control groups.
Claim 12
Dependent Claim
35 words
The method of claim 8 wherein the step of determining the angle of arrival comprises the steps of determining the angle of arrival based on a ratio of the first energy to the second energy.
Claim 13
Dependent Claim
60 words
The method of claim 7 wherein the step of determining the angle of arrival comprises the steps of: determining an energy of the summed prompt ray; determining an amplifier gain value; adjusting the energy of the summed prompt ray by the amplifier gain value; and determining the angle of arrival based on the adjusted energy of the summed prompt ray.
Claim 14
Dependent Claim
18 words
The method of claim 7 wherein the communication system is a code division, multiple access (CDMA) communication system.
References Cited (Backward Citations)
US4334185A
Cited
US4833478A
Cited
US4636796A
Cited
US5334984A
Cited
US5444451A
Cited
US5592181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-27 | 2002-01-26 | 2002-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-27 | 2006-01-26 | 2006-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-27 | 2010-01-26 | 2010-07-28 | $7700.00 | Window Closed / Lapsed |