Abstract: Methods and apparatus are provided for determining a direction of arrival (DOA) (46) of a Radio Frequency (RF) signal (32) transmitted by a remote unit (22) in a wireless communication system (20). The methods comprise receiving the RF signal (32) with multiple antennas (34,36,38,40,42,44) of the antenna array (26) and determining a preliminary direction of arrival (DOA) (78) for the RF signal (32) received with the multiple of antennas (34,36,38,40,42,44) of the antenna array (26). The methods also comprise selecting a coefficient (80) for the antenna array (26) based at least in part upon the preliminary DOA 978), modifying the RF signal (32) with the coefficient (80) to generate a modified RF signal (82), and determining the DOA (46) of the RF signal (32) with the modified RF signal (82).

Abstract: Methods and apparatus are provided for determining a Direction of Arrival (DOA) of a remote unit (22) in a communication system (20). The apparatus includes a first antenna (32) and a second antenna (36) configured to receive an RF signal (32) having a plurality of scattered rays produced by multi-path scattering. A ray selector (114) of the apparatus is configured to identify a first ray and second ray from the scattered plurality of rays received at the first antenna (32) and the second antenna (36). A difference calculator (116) is configured to determine an amplitude difference (120) and a phase difference (122) between the first ray and said second ray, and an angle estimator (118) is configured to calculate a plurality of DOA values (142) based upon the phase difference (122) and select one of the plurality of DOA values (142) utilizing the amplitude difference (120).

Abstract: Methods and apparatus are provided for determining a Direction of Arrival (DOA) of a remote unit (22) in a communication system (20). The apparatus includes a first antenna (32) and a second antenna (36) configured to receive an RF signal (32) having a plurality of scattered rays produced by multi-path scattering. A ray selector (114) of the apparatus is configured to identify a first ray and second ray from the scattered plurality of rays received at the first antenna (32) and the second antenna (36). A difference calculator (116) is configured to determine an amplitude difference (120) and a phase difference (122) between the first ray and said second ray, and an angle estimator (118) is configured to calculate a plurality of DOA values (142) based upon the phase difference (122) and select one of the plurality of DOA values (142) utilizing the amplitude difference (120).

Abstract: Methods and apparatus are provided for determining a direction of arrival (DOA) (46) of a Radio Frequency (RF) signal (32) transmitted by a remote unit (22) in a wireless communication system (20). The methods comprise receiving the RF signal (32) with multiple antennas (34,36,38,40,42,44) of the antenna array (26) and determining a preliminary direction of arrival (DOA) (78) for the RF signal (32) received with the multiple of antennas (34,36,38,40,42,44) of the antenna array (26). The methods also comprise selecting a coefficient (80) for the antenna array (26) based at least in part upon the preliminary DOA 978), modifying the RF signal (32) with the coefficient (80) to generate a modified RF signal (82), and determining the DOA (46) of the RF signal (32) with the modified RF signal (82).

Abstract: In a receiver in a wireless communication system, a plurality of radio frequency signal propagation characteristics associated with a signal transmitted from a transmitter in a coverage area are periodically measured. Next, the plurality of periodically measured radio frequency signal propagation characteristics are processed to produce a time averaged radio frequency signature, wherein the processing extracts the dominant features of the radio frequency signal propagation characteristics. Then the time averaged radio frequency signature is compared with a spatially averaged radio frequency signature, and a figure of merit is generated in response to the comparison.

Abstract: In a wireless communication system, radio frequency signal propagation characteristics associated with a signal transmitted from several locations in the coverage area of the wireless communication system are measured. Next, a plurality of signature regions are defined in the coverage area, wherein the signature regions each contain several selected locations having selected measured radio frequency signal propagation characteristics. For a selected signature region, the associated measured radio frequency signal propagation characteristics are processed to produce a spatially averaged radio frequency signature for the selected signature region. The spatially averaged radio frequency signature represents the dominant features of the radio frequency signal propagation characteristics of a signal transmitted within the selected signature region. Finally, an association between the spatially averaged radio frequency signature and the selected signature region is recorded.