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US 2003/0151553 A1Published application
Base station, base station module and method for direction of arrival estimation
AssigneeNokia Corporation
InventorJuha Ylitalo
Life of this patent
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AssigneeNokia Corporation
InventorJuha Ylitalo
Estimating the term…
The invention relates to a base station for a radio communications network. In order to be able to enhance the resolution for a direction of arrival estimation, the base station comprises: a first phasing network (31) for forming beams (B1-B4) for fixed reception angles; a second phasing network (33) for co-phasing and summing the signals of at least two neighbouring beams (B2, B3), thus forming a beam (B2-3) for a reception angle in-between at least those two neighbouring beams (B2, B3), and for scaling each resulting beam (B2-3) with a predetermined factor; and means for estimating the direction of arrival in the uplink from the beams (B1-B4, B2-3) provided by the first and the second phasing network (31, 33). The invention equally relates to a corresponding method and to a base station module comprising such a first and second phasing network.
Base station for a radio communications network, comprising:
Base station according to one of the preceding claims, wherein the second phasing network (33) is suited for scaling amplitude and/or power of the beams (B2—3) formed in between two neighbouring beams (B2, B3) according to the amplitude and/or power of the beams (B1-B4) formed by the first phasing network (31) in a way that the gain of all formed beams (B1-B4, B2—3) is equal.
Base station according to one of the preceding claims, wherein the second phasing network (33) is suited for scaling amplitude and/or power of the beams (B2—3) formed in between two neighbouring beams (B2, B3) according to the amplitude and/or power of the beams (B1-B4) formed by the first phasing network (31) in a way that the signal-to-noise ratio for each formed beam (B1-B4, B2—3) is equal in case that the same signal is arriving to each beam (B1-B4, B2—3).
Base station according to one of the preceding claims, wherein the second phasing network (33) is suited for scaling amplitude and/or power of the beams (B2—3) formed in between two neighbouring beams (B2,B3) according to the amplitude and/or power of the beams (B1-B4) formed by the first phasing network (31) in a way that the signal-to-interference-and-noise ratio for each formed beam (B1-B4, B2—3) is equal in case that the same signal is arriving to each beam (B1-B4, B2—3) .
Base station according to one of the preceding claims, wherein the second phasing network is suited for co-phasing and summing the signals of all neighbouring beams (B1-B4) formed by the first phasing network.
Base station according to one of the preceding claims, wherein the second phasing network is suited for multiplying the signals provided by the first phasing network for two neighbouring beams (Bi, Bi+1) in between which a composite beam (Bi—i+1) is to be formed with at least one pair of different predetermined factors before co-phasing and summing in order to obtain at least one beam in-between the two neighbouring beams at at least one predetermined azimuth angle.
Base station according to one of the preceding claims, wherein the means for estimating the direction of arrival in the uplink are suited to evaluate the power of the beams provided by the first and the second phasing network for estimating the direction of arrival.
Base station according to one of the preceding claims, wherein the first and the second phasing networks are analogue phasing networks.
Base station according to one of the preceding claims, wherein the first and the second phasing networks (31,33) are digital phasing networks in which a complex valued weight vector represents each beam (B1-B4) in the digital domain.
Base station according to one of the preceding claims, further comprising means for estimating the angular spreading of the received signals based on the beams formed by the first and the second phasing network.
Base station module for a base station comprising a phasing network (33) according to the second phasing network of one of the preceding claims.
Method for enhancing the angular resolution in the estimation of the direction of arrival of signals in the uplink in a base station of a radio communications network, comprising:
Dependencies are inferred from the claim text.