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 life (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.
Claims20
A method of determining an indication of channel quality in a non-linear receiver, the method comprising:
- calculating, by a processing device, spectral efficiencies, with a maximum possible rank selected for the non-linear receiver, for varied code rates and quadrature amplitude modulation schemes to achieve a desired spectral efficiency;
- and
- calculating, by the processing device, the indication of channel quality as a function of an effective signal-to-noise ratio calculated from the desired spectral efficiency.
A user device in a wireless communication environment, the user device comprising:
- a non-linear receiver configured to receive a transmission signal;
- a processor communicatively coupled to the receiver and configured to:
- calculate spectral efficiencies, with a maximum possible rank selected for the non-linear receiver, for varied code rates and quadrature amplitude modulation schemes to achieve a desired spectral efficiency;
- and
- calculate an indication of channel quality as a function of an effective signal-to-noise ratio calculated from the desired spectral efficiency.
A user device in a wireless communication environment, the user device comprising:
- means for calculating spectral efficiencies, with a maximum possible rank selected for a non-linear receiver, for varied code rates and quadrature amplitude modulation schemes to achieve a desired spectral efficiency;
- and
- means for calculating an indication of channel quality as a function of an effective signal-to-noise ratio calculated from the desired spectral efficiency.
A computer program product residing on a tangible non-transitory processor-readable medium and comprising processor-readable instructions configured to cause a processor to:
- calculate spectral efficiencies, with a maximum possible rank selected for a non-linear receiver, for varied code rates and quadrature amplitude modulation schemes to achieve a desired spectral efficiency;
- and
- calculate an indication of channel quality as a function of an effective signal-to-noise ratio calculated from the desired spectral efficiency.
A method of determining rank of a non-linear receiver, the method comprising:
- receiving a transmission signal at a minimum mean-square error non-linear receiver;
- determining successive interference cancellation (SIC) capacity for each of a plurality of possible ranks for the non-linear receiver achieved by employing a successive interference cancellation procedure at the non-linear receiver;
- and
- selecting, according to the SIC capacity determined for each of the plurality of possible ranks for the non-linear receiver, a rank, from the plurality of possible ranks for the non-linear receiver, whose corresponding determined SIC capacity is higher than determined SIC capacities of other of the plurality of possible ranks.
A user device in a wireless communication environment, the user device comprising:
- a non-linear receiver configured to receive a transmission signal;
- a processor communicatively coupled to the receiver and configured to:
- determine successive interference cancellation (SIC) capacity for each of a plurality of possible ranks for the non-linear receiver achieved by employing a successive interference cancellation procedure at the non-linear receiver;
- and
- select, according to the SIC capacity determined for each of the plurality of possible ranks for the non-linear receiver, a rank, from the plurality of possible ranks for the non-linear receiver, whose corresponding determined SIC capacity is higher than determined SIC capacities of other of the plurality of possible ranks.
A user device in a wireless communication environment, the user device comprising:
- means for receiving a transmission signal at a minimum mean-square error non-linear receiver;
- means for determining successive interference cancellation (SIC) capacity for each of a plurality of possible ranks for the non-linear receiver achieved by employing a successive interference cancellation procedure at the non-linear receiver;
- and
- means for selecting, according to the SIC capacity determined for each of the plurality of possible ranks for the non-linear receiver, a rank, from the plurality of possible ranks for the non-linear receiver, whose corresponding determined SIC capacity is higher than determined SIC capacities of other of the plurality of possible ranks.
A computer program product residing on a tangible non-transitory processor-readable medium and comprising processor-readable instructions configured to cause a processor to:
- determine successive interference cancellation (SIC) capacity for each of a plurality of possible ranks for a non-linear receiver achieved by employing a successive interference cancellation procedure at the non-linear receiver;
- and
- select, according to the SIC capacity determined for each of the plurality of possible ranks for the non-linear receiver, a rank, from the plurality of possible ranks for the non-linear receiver, whose corresponding determined SIC capacity is higher than determined SIC capacities of other of the plurality of possible ranks.
Dependencies are inferred from the claim text.