METHOD FOR EFFICIENT CHANNEL ESTIMATION AND BEAMFORMING IN FDD SYSTEM BY EXPLOITING UPLINK-DOWNLINK CORRESPONDENCE
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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.
11 Citations
17 Claims
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1. (canceled)
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2. An apparatus of a wireless device, the apparatus comprising:
processing circuitry, the processing circuitry configured to; decode a first probing signal from a second wireless device, the first probing signal received via a plurality of communication paths; in response to receiving the first probing signal, determine a plurality of signal measurements associated with the plurality of communication paths between the wireless device and the second wireless device, wherein each of the signal measurements is associated with a corresponding one of the plurality of communication paths; and encode a plurality of second probing signals for transmission to the second wireless device, each of the plurality of second probing signals encoded for directional transmission to the second wireless device on the corresponding one of the plurality of communication paths, based on the plurality of signal measurements. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus of a mobile communication device, the apparatus comprising:
processing circuitry coupled to memory, the processing circuitry configured to; encode for transmission to a base station (BS), a plurality of channel sounding signals; estimate a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile communication device and multiple antennas of the BS based on the channel sounding signals, wherein each of the angles-of-arrival is associated with a corresponding one of the plurality of paths between the mobile communication device and the BS; decode a plurality of downlink probing signals received from the multiple antennas of the BS, each downlink probing signal being transmitted directionally toward a corresponding angle-of-arrival of plurality of the angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile communication device; encode channel state information for transmission to the BS, the channel state information corresponding to a channel associated with one of the downlink probing signals; and decoding a rank indicator (RI) and a preceding matrix indicator (PMI) for a downlink data transmission from the BS, the RI and the PMI in response to the received channel state information. - View Dependent Claims (14, 15, 16, 17)
Specification