RESOURCE ALLOCATION FOR MIMO-OFDM COMMUNICATION SYSTEMS
First Claim
1. A method of communicating data in a wireless communication system, the method comprising:
- identifying a first receiver from a plurality of receivers, the first receiver being configured to substantially achieve a first predetermined level of performance, wherein a transmitter is configured to transmit data to the first receiver over a first spatial subchannel using a first frequency subcarrier at a first power level that is sufficient to substantially achieve a first signal-to-noise ratio at the first receiver;
identifying a second receiver from the plurality of receivers, the second receiver being configured to substantially achieve a second predetermined level of performance, wherein the transmitter is configured to transmit data to the second receiver over a second spatial subchannel using a second frequency subcarrier at a second power level that is sufficient to substantially achieve a second signal-to-noise ratio at the second receiver, wherein a sum of the first power level and the second power level is less than a predetermined maximum power level, and wherein the first spatial subchannel is spatially compatible with the second spatial subchannel; and
scheduling the transmitter to communicate with the first receiver over the first spatial subchannel and to communicate with the second receiver over the second spatial subchannel substantially concurrently, wherein the first frequency subcarrier is the same as the second frequency subcarrier.
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Accused Products
Abstract
Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency “signatures” of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlink) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics). One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.
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Citations
20 Claims
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1. A method of communicating data in a wireless communication system, the method comprising:
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identifying a first receiver from a plurality of receivers, the first receiver being configured to substantially achieve a first predetermined level of performance, wherein a transmitter is configured to transmit data to the first receiver over a first spatial subchannel using a first frequency subcarrier at a first power level that is sufficient to substantially achieve a first signal-to-noise ratio at the first receiver; identifying a second receiver from the plurality of receivers, the second receiver being configured to substantially achieve a second predetermined level of performance, wherein the transmitter is configured to transmit data to the second receiver over a second spatial subchannel using a second frequency subcarrier at a second power level that is sufficient to substantially achieve a second signal-to-noise ratio at the second receiver, wherein a sum of the first power level and the second power level is less than a predetermined maximum power level, and wherein the first spatial subchannel is spatially compatible with the second spatial subchannel; and scheduling the transmitter to communicate with the first receiver over the first spatial subchannel and to communicate with the second receiver over the second spatial subchannel substantially concurrently, wherein the first frequency subcarrier is the same as the second frequency subcarrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communication system comprising:
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a first processing circuit configured to identify a first receiver from a plurality of receivers, the first receiver being configured to substantially achieve a first predetermined level of performance, wherein a transmitter is configured to transmit data to the first receiver over a first spatial subchannel using a first frequency subcarrier at a first power level that is sufficient to substantially achieve a first signal-to-noise ratio at the first receiver; a second processing circuit configured to identify a second receiver from the plurality of receivers, the second receiver being configured to substantially achieve a second predetermined level of performance, wherein the transmitter is configured to transmit data to the second receiver over a second spatial subchannel using a second frequency subcarrier at a second power level that is sufficient to substantially achieve a second signal-to-noise ratio at the second receiver, wherein a sum of the first power level and the second power level is less than a predetermined maximum power level, and wherein the first spatial subchannel is spatially compatible with the second spatial subchannel; and a third processing circuit configured to schedule the transmitter to communicate with the first receiver over the first spatial subchannel and to communicate with the second receiver over the second spatial subchannel substantially concurrently, wherein the first frequency subcarrier is the same as the second frequency subcarrier. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A wireless communication system comprising:
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means for identifying a first receiver from a plurality of receivers, the first receiver being configured to substantially achieve a first predetermined level of performance, wherein a transmitter is configured to transmit data;
to the first receiver over a first spatial subchannel using a first frequency subcarrier at a first power level that is sufficient to substantially achieve a first signal-to-noise ratio at the first receiver;means for identifying a second receiver from the plurality of receivers, the second receiver being configured to substantially achieve a second predetermined level of performance, wherein the transmitter is configured to transmit data to the second receiver over a second spatial subchannel using a second frequency subcarrier at a second power level that is sufficient to substantially achieve a second signal-to-noise ratio at the second receiver, wherein a sum of the first power level and the second power level is less than a predetermined maximum power level, and wherein the first spatial subchannel is spatially compatible with the second spatial subchannel; and means for scheduling the transmitter to communicate with the first receiver over the first spatial subchannel and to communicate with the second receiver over the second spatial subchannel substantially concurrently, wherein the first frequency subcarrier is the same as the second frequency subcarrier. - View Dependent Claims (16, 17, 18, 19)
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20. A computer program product comprising:
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computer-readable medium comprising; code for causing a computer to identify a first receiver from a plurality of receivers, the first receiver being configured to substantially achieve a first predetermined level of performance, wherein a transmitter is configured to transmit data to the first receiver over a first spatial subchannel using a first frequency subcarrier at a first power level that is sufficient to substantially achieve a first signal-to-noise ratio at the first receiver; code for causing a computer to identify a second receiver from the plurality of receivers, the second receiver being configured to substantially achieve a second predetermined level of performance, wherein the transmitter is configured to transmit data to the second receiver over a second spatial subchannel using a second frequency subcarrier at a second power level that is sufficient to substantially achieve a second signal-to-noise ratio at the second receiver, wherein a sum of the first power level and the second power level is less than a predetermined maximum power level, and wherein the first spatial subchannel is spatially compatible with the second spatial subchannel; and code for causing a computer to schedule the transmitter to communicate with the first receiver over the first spatial subchannel and to communicate with the second receiver over the second spatial subchannel substantially concurrently, wherein the first frequency subcarrier is the same as the second frequency subcarrier.
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Specification