Adaptive modulation and coding
AssigneeNortel Networks Limited
InventorsMing Jia, Jianglei Ma, Peiying Zhu, Dong-Sheng Yu, Wen Tong
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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.
Claims33
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.
A wireless communication device comprising:
- 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.
A wireless communication device comprising:
- 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.
Dependencies are inferred from the claim text.