Method for determining an angle of arrival of a signal transmitted by a remote unit in a communication system
First Claim
1. 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.
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Accused Products
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.
47 Citations
12 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining an angle of arrival of a remote unit in a communication system, the method comprising the steps of:
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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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification