CHANNEL ESTIMATION FOR A VERY LARGE-SCALE MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEM
First Claim
1. A method of transmitting pilot reference signals utilized by a receiver for channel estimation in a Multiple-Input Multiple-Output (MIMO) communication system in which a transmitter utilizes a plurality of transmit antennas, the method comprising the steps of:
- spacing the plurality of transmit antennas such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level;
selecting by the transmitter, a selected subset of the plurality of transmit antennas for transmitting the pilot reference signals; and
transmitting the pilot reference signals only from the selected subset of transmit antennas to a receiver.
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Accused Products
Abstract
A transmitter, receiver, and method for channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which the transmitter includes a multiplicity of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level. The transmitter selects a subset of the multiplicity of transmit antennas for transmitting the pilot reference signals. The pilot reference signals are transmitted only from the selected subset of transmit antennas to the receiver. The receiver includes a channel estimator configured to derive a channel estimation for all of the multiplicity of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the multiplicity of transmit antennas.
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Citations
22 Claims
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1. A method of transmitting pilot reference signals utilized by a receiver for channel estimation in a Multiple-Input Multiple-Output (MIMO) communication system in which a transmitter utilizes a plurality of transmit antennas, the method comprising the steps of:
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spacing the plurality of transmit antennas such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level; selecting by the transmitter, a selected subset of the plurality of transmit antennas for transmitting the pilot reference signals; and transmitting the pilot reference signals only from the selected subset of transmit antennas to a receiver. - View Dependent Claims (2)
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3. A method of channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which a transmitter utilizes a plurality of transmit antennas, the method comprising the steps of:
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receiving by a receiver, pilot reference signals transmitted only from a selected subset of the plurality of transmit antennas; and deriving a channel estimation for all of the plurality of transmit antennas using spatial correlation among the plurality of transmit antennas. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A transmitter for transmitting pilot reference signals utilized by a receiver for channel estimation in a Multiple-Input Multiple-Output (MIMO) communication system, the transmitter comprising:
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a plurality of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level; an antenna subset selector configured to select a subset of the plurality of transmit antennas for transmitting the pilot reference signals; and a radio frequency transmitter coupled to the selected subset of transmit antennas and configured to transmit the pilot reference signals only from the selected subset of transmit antennas to the receiver. - View Dependent Claims (14)
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15. A receiver in a Multiple-Input Multiple-Output (MIMO) communication system in which a transmitter utilizes a plurality of transmit antennas, the receiver comprising:
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a radio frequency receiver configured to receive pilot reference signals transmitted only from a selected subset of the plurality of transmit antennas; and a channel estimator configured to derive a channel estimation for all of the plurality of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the plurality of transmit antennas. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of transmitting pilot reference signals utilized by a receiver for channel estimation in a Multiple-Input Multiple-Output (MIMO) communication system in which a transmitter utilizes a plurality of transmit antennas, the method comprising the steps of:
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selecting by the transmitter, a selected subset of the plurality of transmit antennas for transmitting the pilot reference signals; and transmitting the pilot reference signals only from the selected subset of transmit antennas through a propagation environment to a receiver; wherein the selecting step includes selecting transmit antennas at an interval in the spatial domain depending on scattering characteristics of the propagation environment such that the receiver can interpolate the channel over those antennas that do not transmit pilot reference signals. - View Dependent Claims (22)
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Specification