METHOD FOR PRECODING BASED ON ANTENNA GROUPING
First Claim
1. A method for performing uplink transmission in a user device with a plurality of transmit antennas, the method comprising:
- transmitting a first data stream from a first subset of the plurality of transmit antennas according to a first precoding vector, wherein the first precoding vector may be any vector in a precoding codebook;
transmitting a second data stream from a second subset of the plurality of transmit antennas according to a second precoding vector,wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to a scaling factor.
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Abstract
A method an apparatus for performing uplink transmission in a user device with a plurality of transmit antennas, including transmitting a first data stream from a first subset of the antennas according to a first precoding vector wherein the first precoding vector may be any vector in a precoding codebook, and transmitting a second data stream from a second subset of the antennas according to a second precoding vector wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to within a scaling factor.
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Citations
22 Claims
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1. A method for performing uplink transmission in a user device with a plurality of transmit antennas, the method comprising:
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transmitting a first data stream from a first subset of the plurality of transmit antennas according to a first precoding vector, wherein the first precoding vector may be any vector in a precoding codebook; transmitting a second data stream from a second subset of the plurality of transmit antennas according to a second precoding vector, wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to a scaling factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A method for performing uplink transmission in a user device with a plurality of transmit antennas, the method comprising:
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transmitting a first data stream from a first subset of the plurality of transmit antennas according to a first precoding vector, wherein at any time instant the first precoding vector is one of a first set of precoding vectors in a precoding codebook; transmitting a second data stream from a second subset of the plurality of transmit antennas according to a second precoding vector, wherein at a plurality of time instants the second precoding vector is one of a second set of precoding vectors in the precoding codebook, wherein at each of the plurality of time instants the second precoding vector is the same as the first precoding vector to a scaling factor and at each of the plurality of time instants the first set of precoding vectors is the same as the second set of precoding vectors to a scaling factor.
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13. A method in a base station, the method comprising:
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indicating to a user device a first precoding vector selected from a precoding codebook, wherein the first precoding vector is for a first subset of a plurality transmit antennas of the user device; indicating to the user device a second precoding vector, wherein the second precoding vector is for a second subset of a plurality transmit antennas of the user device, wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to a scaling factor. - View Dependent Claims (14, 15, 16, 17, 19, 21, 22)
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18. A wireless terminal comprising:
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a plurality of transmit antennas; a plurality of transceivers coupled to the plurality of transmit antennas; a precoding module coupled to the plurality of transceivers, the precoding module weights a first data stream according to a first precoding vector, wherein the first data stream is transmitted from a first subset of transmit antennas and the first precoding vector may be any vector in a precoding codebook, the precoding module weights a second data stream according to a second precoding vector, wherein the second data stream is transmitted from a second subset of transmit antennas and wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to a scaling factor. - View Dependent Claims (20)
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Specification