METHOD FOR EFFICIENT CHANNEL ESTIMATION AND BEAMFORMING IN FDD SYSTEM BY EXPLOITING UPLINK-DOWNLINK CORRESPONDENCE
First Claim
1. A method for selecting at least one parameter for downlink data transmission with a mobile user equipment, the method executable by a wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment, the method comprising:
- receiving an uplink probing signal from the mobile user equipment;
determining, from the received uplink probing signal, a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas;
transmitting, from the multiple antennas, a plurality of downlink probing signals directionally toward corresponding angles-of-arrival in the plurality of angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile user equipment;
receiving, from the mobile user equipment, channel state information; and
composing, in response to the received channel state information, at least one of a rank indicator (RI), precoding matrix indicator (PMI), or modulating and coding scheme (MCS) for downlink data transmission to the mobile user equipment.
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Accused Products
Abstract
A method for selecting at least one parameter for downlink data transmission with a mobile user equipment. The method is executable by a wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment. The method receives an uplink probing signal from the mobile user equipment. The method determines a plurality of angles of arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas. The method transmits a plurality of downlink probing signals directionally toward corresponding angles of arrival in the plurality of angles of arrival. Each downlink probing signal is a virtual antenna port with respect to the mobile user equipment. The method receives channel state information. The method composes at least one of a rank indicator (RI), precoding matrix indicator (PMI), or modulating and coding scheme (MCS) for downlink data transmission to the mobile user equipment.
33 Citations
20 Claims
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1. A method for selecting at least one parameter for downlink data transmission with a mobile user equipment, the method executable by a wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment, the method comprising:
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receiving an uplink probing signal from the mobile user equipment; determining, from the received uplink probing signal, a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas; transmitting, from the multiple antennas, a plurality of downlink probing signals directionally toward corresponding angles-of-arrival in the plurality of angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile user equipment; receiving, from the mobile user equipment, channel state information; and composing, in response to the received channel state information, at least one of a rank indicator (RI), precoding matrix indicator (PMI), or modulating and coding scheme (MCS) for downlink data transmission to the mobile user equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment, the wireless communication base station including circuitry configured to:
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receive an uplink probing signal from the mobile user equipment; determine, from the received uplink probing signal, a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas; transmit, from the multiple antennas, a plurality of downlink probing signals directionally toward corresponding angles-of-arrival in the plurality of angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile user equipment; receive, from the mobile user equipment, channel state information; and compose, in response to the received channel state information, at least one of a rank indicator (RI), precoding matrix indicator (PMI), or modulating and coding scheme (MCS) for downlink data transmission to the mobile user equipment. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for selecting at least one parameter for downlink data transmission with a mobile user equipment, the method performed by a wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment, the method comprising:
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receiving an uplink probing signal from the mobile user equipment; employing an angle-of-arrival estimation algorithm; determining, from the angle-of-arrival estimation algorithm, a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas; transmitting, from the multiple antennas, a plurality of downlink probing signals directionally toward corresponding angles-of-arrival in the plurality of angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile user equipment, each downlink probing signal appearing to originate from a different location from the point of view of the mobile user equipment the uplink probing signal and the downlink probing signals having different frequencies; receiving, from the mobile user equipment, channel state information; and composing, in response to the received channel state information, at least one of a rank indicator (RI), precoding matrix indicator (PMI), or modulating and coding scheme (MCS) for downlink data transmission to the mobile user equipment.
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Specification