CQI and rank prediction for list sphere decoding and ML MIMO receivers
AssigneeQUALCOMM Incorporated
InventorsHemanth Sampath, Tamer Kadous
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Abstract
Systems and methodologies are described that facilitate integrating a list-sphere decoding design in a multiple input-multiple output (MIMO) wireless communication environment. According to various aspects, optimal rank selection and CQI computation for an optimal rank can be performed in conjunction with a non-linear receiver, such as a maximum likelihood (ML) MMSE receiver, a non-linear receiver with a list-sphere decoder, and the like. Optimal rank selection can be performed using a maximum rank selection protocol, a channel capacity-based protocol, or any other suitable protocol that facilitates rank selection, and CQI information can be generated based in part on effective SNRs determined with regard to a selected optimal rank.
Claims16
A method of calculating rank in a non-linear transceiver in a wireless communication transceiver, comprising:
- receiving a transmission signal at a non-linear receiver;
- generating submatrices from a transmission channel over which the transmission signal is received;
- performing a Q-R decomposition on the submatrices and deriving respective upper triangle matrices;
- determining an effective SNR for one or more possible transmission ranks;
- determining a channel capacity metric for all possible ranks of the transmission signal;
- and
- selecting a rank that maximizes channel capacity for transmissions.
A wireless communication apparatus, comprising:
- means for performing a non-linear decoding protocol on a received multiple-layer signal in a user device;
- means for generating submatrices from a transmission channel over which the transmission signal is received;
- means for performing a Q-R decomposition on the submatrices and deriving respective upper triangle matrices;
- means for determining an effective SNR for one or more possible transmission ranks;
- means for determining a channel capacity metric for each possible rank of the received signal;
- and
- means for transmitting information related to an optimal rank with channel quality indicator (CQI) information over a reverse link control channel.
A computer-readable medium having stored thereon computer-executable instructions for:
- employing a non-linear decoding protocol to decode a received multiple-layer signal in a user device;
- generating submatrices from a transmission channel over which the transmission signal is received;
- performing a Q-R decomposition on the submatrices and deriving respective upper triangle matrices;
- determining an effective SNR for one or more possible transmission ranks;
- determining a channel capacity metric for all possible ranks of the transmission signal;
- and
- selecting a rank that maximizes channel capacity for transmissions.
A method of calculating rank in a non-linear transceiver in a wireless communication transceiver, comprising:
- receiving a transmission signal at a non-linear receiver including a plurality of antennas;
- generating submatrices from a transmission channel over which the transmission signal is received;
- performing a Q-R decomposition on the submatrices and deriving respective upper triangle matrices;
- determining an effective SNR for one or more possible transmission ranks, each of said ranks corresponding to a corresponding number of spatial streams mapped to said plurality of antennas;
- determining a channel capacity metric for all possible ranks of the transmission signal;
- and
- selecting a rank that maximizes channel capacity for transmissions.
Dependencies are inferred from the claim text.