Method and apparatus for utilizing channel state information in a wireless communication system
First Claim
1. A method for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
- at the receiver unit, receiving a plurality of signals via a plurality of receive antennas, wherein the received signal from each receive antenna comprises a combination of one or more signals transmitted from the transmitter unit, processing the received signals to derive channel state information (CSI) indicative of characteristics of a plurality of transmission channels used for data transmission, and transmitting the CSI back to the transmitter unit; and
at the transmitter unit, receiving the CSI from the receiver unit, processing data for transmission to the receiver unit based on the received CSI to provide modulation symbols, and conditioning the modulation symbols to generate a plurality of signals suitable for transmission from the transmitter unit to the receiver unit.
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Abstract
Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals are received via a number of receive antennas, with the received signal from each receive antenna comprising a combination of one or more signals transmitted from the transmitter unit. The received signals are processed with a spatial, a space-time, or a full-CSI technique to derive channel state information (CSI) indicative of the characteristics of a number of transmission channels used for data transmission. The CSI (which may comprise SNR estimates, data rate indicators, complex channel gains, or some other information) is transmitted back to the transmitter unit. At the transmitter unit, the CSI is received and data for transmission to the receiver unit is processed (e.g., coded and modulated) based on the received CSI.
217 Citations
53 Claims
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1. A method for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
at the receiver unit, receiving a plurality of signals via a plurality of receive antennas, wherein the received signal from each receive antenna comprises a combination of one or more signals transmitted from the transmitter unit, processing the received signals to derive channel state information (CSI) indicative of characteristics of a plurality of transmission channels used for data transmission, and transmitting the CSI back to the transmitter unit; and
at the transmitter unit,receiving the CSI from the receiver unit, processing data for transmission to the receiver unit based on the received CSI to provide modulation symbols, and conditioning the modulation symbols to generate a plurality of signals suitable for transmission from the transmitter unit to the receiver unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 52)
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34. A method for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
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at the receiver unit, receiving a plurality of signals via a plurality of receive antennas, wherein the received signal from each receive antenna comprises a combination of one or more signals transmitted from the transmitter unit, processing the plurality of received signals in accordance with a linear spatial processing technique, a space-time processing technique, or a full-CSI processing technique to provide estimates of modulation symbols transmitted from the transmitter unit, estimating signal-to-noise-plus-interference ratios (SNRs) for a plurality of transmission channels used for data transmission, and transmitting the SNR estimates for the plurality of transmission channels back to the transmitter unit; and
at the transmitter unit, receiving the SNR estimates for the plurality of transmission channels, and processing data for transmission to the receiver unit based on the received SNR estimates.
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42. A multiple-input multiple-output (MINO) communication system comprising:
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a receiver unit comprising a plurality of front-end processors configured to receive a plurality of signals via a plurality of receive antennas and to process the received signals to provide received modulation symbols, at least one MIMO processor coupled to the front-end processors and configured to receive and process the received modulation symbols to derive channel state information (CSI) indicative of characteristics of a plurality of transmission channels used for data transmission, and a transmit data processor operatively coupled to the MIMO processor and configured to process the CSI for transmission from the receiver unit; and
a transmitter unit comprising at least one demodulator configured to receive and process one or more signals from the receiver unit to recover the transmitted CSI, a transmit data processor configured to process data for transmission to the receiver unit based on the recovered CSI to provide modulation symbols, and at least one modulator coupled to the transmit data processor and configured to condition the modulation symbols to generate a plurality of signals suitable for transmission from the transmitter unit to the receiver unit.
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43. A multiple-input multiple-output (MIMO) communication system comprising:
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a receiver unit comprising means for receiving and processing a plurality of signals to provide received modulation symbols, means for processing the received modulation symbols to derive channel state information (CSI) indicative of characteristics of a plurality of transmission channels used for data transmission, and means for processing the CSI for transmission from the receiver unit; and
a transmitter unit comprising means for receiving and processing one or more signals from the receiver unit to recover the transmitted CSI, means for processing data for transmission to the receiver unit based on the recovered CSI to provide modulation symbols, and means for conditioning the modulation symbols to generate a plurality of signals suitable for transmission from the transmitter unit to the receiver unit.
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44. A multiple-input multiple-output (MIMO) communication system comprising:
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a receiver unit comprising means for receiving a plurality of signals, each comprising a combination of one or more transmitted signals, means for processing the plurality of received signals in accordance with a linear spatial processing technique, a space-time processing technique, or a full-CSI processing technique to provide estimates of modulation symbols in the one or more transmitted signals, means for estimating signal-to-noise-plus-interference ratios (SNRs) for a plurality of transmission channels used for data transmission, and means for transmitting the SNR estimates for the plurality of transmission channels; and
a transmitter unit comprising means for receiving the SNR estimates for the plurality of transmission channels, and means for processing data for transmission to the receiver unit based on the received SNR estimates. - View Dependent Claims (46, 47, 48, 49, 50, 51)
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45. A receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
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a plurality of receive antennas configured to receive a plurality of transmitted signals to provide a plurality of received signals;
a plurality of front-end processors coupled to the plurality of receive antennas and configured to receive and process the plurality of received signals to provide received modulation symbols;
a MIMO processor coupled to the plurality of front-end processors and configured to receive and process the received modulation symbols in accordance with a receiver processing technique to provide estimates of modulation symbols in the transmitted signals;
a channel quality estimator coupled to the MIMO processor and configured to estimate characteristics of a plurality of transmission channels used for data transmission and to provide channel state information (CSI) indicative of the estimated channel characteristics; and
a transmit data processor configured to receive and process the CSI for transmission from the receiver unit.
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53. A receiver unit in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for receiving and processing a plurality of signals to provide received modulation symbols;
means for processing the received modulation symbols in accordance with a receiver processing technique to provide estimates of modulation symbols in the transmitted signals;
means for estimating characteristics of a plurality of transmission channels used for data transmission and for providing channel state information (CSI) indicative of the estimated channel characteristics; and
means for processing the CSI for transmission from the receiver unit.
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Specification