Multiple-access multiple-input multiple-output (MIMO) communication system
First Claim
1. A method for transmitting data in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
- selecting one or more terminals for data transmission;
receiving channel state information (CSI) indicative of channel conditions for the one or more selected terminals;
processing data for the one or more selected terminals based on the received CSI to provide a plurality of modulated signals; and
transmitting the plurality of modulated signals via a plurality of transmit antennas to the one or more selected terminals.
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Abstract
Techniques to achieve better utilization of the available resources and robust performance for the downlink and uplink in a multiple-access MIMO system. Techniques are provided to adaptively process data prior to transmission, based on channel state information, to more closely match the data transmission to the capacity of the channel. Various receiver processing techniques are provided to process a data transmission received via multiple antennas at a receiver unit. Adaptive reuse schemes and power back-off are also provided to operate the cells in the system in a manner to further increase the spectral efficiency of the system (e.g., reduce interference, improve coverage, and attain high throughput). Techniques are provided to efficiently schedule data transmission on the downlink and uplink. The scheduling schemes may be designed to optimize transmissions (e.g., maximize throughput) for single or multiple terminals in a manner to meet various constraints and requirements.
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Citations
53 Claims
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1. A method for transmitting data in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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selecting one or more terminals for data transmission;
receiving channel state information (CSI) indicative of channel conditions for the one or more selected terminals;
processing data for the one or more selected terminals based on the received CSI to provide a plurality of modulated signals; and
transmitting the plurality of modulated signals via a plurality of transmit antennas to the one or more selected terminals. - 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, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method for transmitting data on a downlink in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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receiving estimated signal-to-noise-plus-interference ratios (SNRs) achieved at a plurality of terminals for a plurality of transmit antennas;
selecting one or more terminals for data transmission based on the estimated SNRs;
processing data for the one or more selected terminals based on the estimated SNRs to provide a plurality of modulated signals; and
transmitting the plurality of modulated signals via the plurality of transmit antennas to the one or more selected terminals, and wherein the system is configurable to transmit data via a plurality of operating modes comprised of a single-user MIMO mode, a multi-user MIMO mode, and a mixed mode.
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43. A method for transmitting data in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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receiving channel state information (CSI) indicative of channel conditions for a plurality of terminals;
selecting one or more terminals for uplink data transmission;
sending information indicative of at least one transmission parameter to the one or more selected terminals;
receiving, via a plurality of receive antennas, a plurality of modulated signals from the one or more selected terminals; and
processing a plurality of received signals to recover data transmitted by the one or more selected terminals. - View Dependent Claims (44, 45, 46, 47, 48, 49)
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50. A base station in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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a scheduler operative to select one or more terminals for data transmission;
a controller operative to receive channel state information (CSI) indicative of channel conditions for the one or more selected terminals and to provide one or more controls based on the received CSI;
a TX data processor operative to process data for the one or more selected terminals based on the one or more controls to provide a plurality of modulation symbol streams;
a modulator operative to generate a plurality of modulated signals for the plurality of modulation symbol streams; and
a plurality of transmit antennas configured to transmit the modulated signals to the one or more selected terminals.
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51. A base station in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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means for selecting one or more terminals for data transmission;
means for receiving channel state information (CSI) indicative of channel conditions for the one or more selected terminals and for providing one or more controls based on the received CSI;
means for processing data for the one or more selected terminals based on the one or more controls to provide a plurality of modulation symbol streams;
means for generating a plurality of modulated signals for the plurality of modulation symbol streams; and
means for transmitting the modulated signals to the one or more selected terminals.
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52. A terminal in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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at least one front-end processor operative to receive and process at least one received signal to provide received modulation symbols;
a RX MIMO/data processor operative 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, wherein the RX MIMO/data processor is further operative to provide channel state information (CSI) indicative of channel conditions for the plurality of transmitted signals; and
a TX data processor configured to receive and process the CSI for transmission from the terminal.
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53. A terminal in a multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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means for processing at least one received signal 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 deriving channel state information (CSI) indicative of channel conditions for the plurality of transmitted signals; and
means for processing the CSI for transmission from the terminal.
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Specification