Transceivers and methods for use in transmitting information in a massive MIMO system
First Claim
1. A wireless apparatus for use in a wireless communication system, the apparatus comprising:
- a plurality of antenna elements;
a baseband processor;
a plurality of radio-frequency (RF) chains coupled to the baseband processor;
a plurality of switches coupled to the plurality of RF chains, wherein positions of switches in the plurality of switches being determined by instantaneous channel state information;
a radio-frequency (RF) preprocessor coupled between the plurality of switches and the plurality of antenna elements, the RF preprocessor to apply a preprocessing matrix to signals, elements of the preprocessing matrix being adjusted as a function of average channel state information, and wherein the positions of the switches and elements of the preprocessing matrix are jointly chosen, and wherein the preprocessing matrix is chosen based on a metric related to expected performance obtained from at least one channel realization.
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Abstract
A method and apparatus is disclosed herein for transmitting information in massive MIMO system. In one embodiment, the apparatus comprises a plurality of antenna elements; a baseband processor; a plurality of radio-frequency (RF) chains coupled to the baseband processor; a plurality of switches coupled to the plurality of RF chains, wherein positions of switches in the plurality of switches being determined by instantaneous channel state information; a radio-frequency (RF) preprocessor coupled between the plurality of switches and the plurality of antenna elements, the RF preprocessor to apply a preprocessing matrix to signals, elements of the preprocessing matrix being adjusted as a function of average channel state information, and wherein the positions of the switches and elements of the preprocessing matrix are jointly chosen, and wherein the preprocessing matrix is chosen based on a metric related to expected performance obtained from at least one channel realization.
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Citations
35 Claims
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1. A wireless apparatus for use in a wireless communication system, the apparatus comprising:
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a plurality of antenna elements; a baseband processor; a plurality of radio-frequency (RF) chains coupled to the baseband processor; a plurality of switches coupled to the plurality of RF chains, wherein positions of switches in the plurality of switches being determined by instantaneous channel state information; a radio-frequency (RF) preprocessor coupled between the plurality of switches and the plurality of antenna elements, the RF preprocessor to apply a preprocessing matrix to signals, elements of the preprocessing matrix being adjusted as a function of average channel state information, and wherein the positions of the switches and elements of the preprocessing matrix are jointly chosen, and wherein the preprocessing matrix is chosen based on a metric related to expected performance obtained from at least one channel realization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless apparatus for use in a wireless communication system, the apparatus comprising:
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a plurality of antenna elements; a baseband processor; a plurality of radio-frequency (RF) chains coupled to the baseband processor; a plurality of switches coupled to the plurality of RF chains, wherein positions of switches in the plurality of switches being determined by instantaneous channel state information; a radio-frequency (RF) preprocessor coupled between the plurality of switches and the plurality of antenna elements, the RF preprocessor to apply a preprocessing matrix to signals, elements of the preprocessing matrix being adjusted as a function of average channel state information, and wherein the positions of the switches and elements of the preprocessing matrix are jointly chosen, and wherein the switch positions and the preprocessing matrix are selected to enable simultaneous transmission to multiple users.
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16. A method for learning a channel correlation matrix between a first device having a transmitter and a second device having a receiver, without requiring learning of specific instantaneous channel realizations between the transmitter and the receiver, the method comprising:
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receiving a number of sets of transmissions from the second device, wherein each transmission in the sets of transmissions being a transmission of a training signal separately transmitted by each of N antennas of the second device, and said set of transmissions being performed by a different set of N antennas of the second device, the number of sets being equal to a ratio of a number of antennas of the first device to the N antennas of the second device; and generating an estimate of the channel correlation matrix based on the number of sets of transmissions from the second device. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for performing a wireless transmission of data, the method comprising:
jointly selecting positions of transmission switches of a switching matrix of a wireless device and elements of a preprocessing matrix of an RF preprocessor at a transmitter, the switching matrix coupling a plurality of transmission chains to the RF preprocessor in the wireless device, including determining the positions of transmission switches based on instantaneous channel state information; and adjusting elements of the preprocessing matrix as a function of average channel state information, and wherein the preprocessing matrix is chosen based on a metric related to expected performance obtained from at least one channel realization. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
Specification