METHODS AND APPARATUS FOR UPLINK CONTROL TRANSMIT DIVERSITY
First Claim
1. A method in a user equipment (UE) for dual-antenna transmission of a subframe shared by a plurality of users using space-time coding, the method comprising:
- generating, at the UE, a first plurality of modulation symbols and a second plurality of modulation symbols to be transmitted on the subframe;
generating, at the UE, a third plurality of modulation symbols and a fourth plurality of modulation symbols by performing Alamouti coding on each pair of modulation symbols in each of the first and second pluralities of modulation symbols;
generating a spread matrix for each of the pluralities of modulation symbols such that each column of each spread matrix for the first and third pluralities of modulation symbols maps to a corresponding single carrier-frequency division multiple access (SC-FDMA) symbol of a first slot of the subframe, and each column of each spread matrix of the second and fourth pluralities of modulation symbols maps to a corresponding SC-FDMA symbol of a second slot of the subframe; and
transmitting the subframe such that the first plurality of modulation symbols are transmitted on the first slot via a first antenna, the second plurality of modulation symbols are transmitted on the second slot via the first antenna, the third plurality of modulation symbols are transmitted on the first slot via the second antenna, and the fourth plurality of modulation symbols are transmitted on the second slot via the second antenna.
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Accused Products
Abstract
A method and apparatus in a user equipment transmit a subframe shared by multiple users through a dual-antenna transmission scheme by using space-time coding. A first and a second plurality of modulation symbols are generated. A third and a fourth plurality of modulation symbols are generated by performing Alamouti coding on each pair of modulation symbols in each of the first and second pluralities of modulation symbols. A spread matrix is generated for each modulation symbol such that the first and third pluralities of modulation symbols are mapped to a first slot of the subframe, and the second and third pluralities of modulation symbols are mapped to a second slot of the subframe. The subframe is transmitted such that the first and second pluralities of modulation symbols are transmitted via a first antenna, and the third and fourth pluralities of modulation symbols are transmitted via a second antenna.
63 Citations
20 Claims
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1. A method in a user equipment (UE) for dual-antenna transmission of a subframe shared by a plurality of users using space-time coding, the method comprising:
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generating, at the UE, a first plurality of modulation symbols and a second plurality of modulation symbols to be transmitted on the subframe; generating, at the UE, a third plurality of modulation symbols and a fourth plurality of modulation symbols by performing Alamouti coding on each pair of modulation symbols in each of the first and second pluralities of modulation symbols; generating a spread matrix for each of the pluralities of modulation symbols such that each column of each spread matrix for the first and third pluralities of modulation symbols maps to a corresponding single carrier-frequency division multiple access (SC-FDMA) symbol of a first slot of the subframe, and each column of each spread matrix of the second and fourth pluralities of modulation symbols maps to a corresponding SC-FDMA symbol of a second slot of the subframe; and transmitting the subframe such that the first plurality of modulation symbols are transmitted on the first slot via a first antenna, the second plurality of modulation symbols are transmitted on the second slot via the first antenna, the third plurality of modulation symbols are transmitted on the first slot via the second antenna, and the fourth plurality of modulation symbols are transmitted on the second slot via the second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus in a transmitter of a user equipment (UE) for performing dual-antenna transmission of a subframe shared by a plurality of users using space-time coding, the apparatus comprising:
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a channel coding and modulation block configured to generate a first plurality of modulation symbols and a second plurality of modulation symbols to be transmitted on the subframe; and a transmit diversity processing block configured to; generate a third plurality of modulation symbols and a fourth plurality of modulation symbols by performing Alamouti coding on each pair of modulation symbols in each of the first and second pluralities of modulation symbols, and generate a spread matrix for each of the pluralities of modulation symbols such that each column of each spread matrix for the first and third pluralities of modulation symbols maps to a corresponding single carrier-frequency division multiple access (SC-FDMA) symbol of a first slot of the subframe, and each column of each spread matrix of the second and fourth pluralities of modulation symbols maps to a corresponding SC-FDMA symbol of a second slot of the subframe, and wherein the transmitter is configured to transmit the subframe such that the first plurality of modulation symbols are transmitted on the first slot via a first antenna, the second plurality of modulation symbols are transmitted on the second slot via the first antenna, the third plurality of modulation symbols are transmitted on the first slot via the second antenna, and the fourth plurality of modulation symbols are transmitted on the second slot via the second antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification