Adaptive modulation and coding
First Claim
Patent Images
1. A method comprising:
- receiving channel quality indicia from a receiver, the channel quality indicia bearing on a quality of channels used for transmissions to the receiver;
determining a channel eigenvalue indicia (CEI), with a complex propagation matrix that reflects that receive antennas have equal signal strength and that channel vectors for the receive antennas are orthogonal to one another;
selecting a space-time encoding mode from amongst a plurality of space-time encoding modes for transmitting data to the receiver based on the channel quality indicia and the CEI; and
transmitting the data to the receiver using the selected space-time encoding mode via a plurality of transmit antennas.
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Abstract
The present invention selects a space-time encoding mode to use when transmitting with spatial diversity based on the receive diversity associated with a receiver device and the quality of the transmission channels based on information fed back from the receiver device. The selectable space-time encoding modes are preferably space-time transmit diversity encoding and a version of BLAST-type encoding. Further, modulation modes, error encoding rates, or a combination thereof, may also be based on the quality of the transmission channels and the available diversity of the receiver device.
168 Citations
33 Claims
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1. A method comprising:
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receiving channel quality indicia from a receiver, the channel quality indicia bearing on a quality of channels used for transmissions to the receiver; determining a channel eigenvalue indicia (CEI), with a complex propagation matrix that reflects that receive antennas have equal signal strength and that channel vectors for the receive antennas are orthogonal to one another; selecting a space-time encoding mode from amongst a plurality of space-time encoding modes for transmitting data to the receiver based on the channel quality indicia and the CEI; and transmitting the data to the receiver using the selected space-time encoding mode via a plurality of transmit antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless communication device comprising:
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receive circuitry for receiving information from a remote device; transmit circuitry associated with a plurality of antennas and adapted to provide spatial diversity for transmissions to the remote device; and processing circuitry associated with the receive circuitry and the transmit circuitry and adapted to; receive channel quality indicia from the remote device, the channel quality indicia bearing on a quality of channels used for transmissions to the remote device; determine channel eigenvalue indicia (CEI) with a complex propagation matrix that reflects that receive antennas have equal signal strength and that channel vectors for the receive antennas are orthogonal to one another; select a space-time encoding mode from amongst a plurality of space-time encoding modes for transmitting data to the remote device based on the channel quality indicia and the CEI; and effect transmission of the data to the remote device using the selected space-time encoding mode via a plurality of transmit antennas. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A wireless communication device comprising:
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means for receiving channel quality indicia from a receiver, the channel quality indicia bearing on a quality of channels used for transmissions to the receiver; means for determining channel eigenvalue indicia (CEI) with a complex propagation matrix that reflects that receive antennas have equal signal strength and that channel vectors for the receive antennas are orthogonal to one another; means for selecting a space-time encoding mode from amongst a plurality of space-time encoding modes for transmitting data to the receiver based on the channel quality indicia and the CEI; and means for transmitting the data to the receiver using the selected space-time encoding mode via a plurality of transmit antennas. - View Dependent Claims (30, 31, 32, 33)
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Specification