Capacity based rank prediction for MIMO design
AssigneeQUALCOMM Incorporated
InventorsHemanth Sampath, Tamer Kadous
Life of this patent
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Abstract
The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer transmissions for each tone, calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices, mapping the SNR for each tone to generate effective SNRs for each layer transmission, calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and maximizing an over-all spectral efficiency based on the AWGN capacities; and selecting a rank based on maximizing the over-all spectral efficiency.
Claims16
A method of rank prediction, comprising:
- calculating MIMO channel matrices corresponding to layer transmissions for each tone;
- calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices;
- mapping the SNRs using a mapper for each tone to generate effective SNRs for each layer transmission;
- calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and denoted as Cap1, Cap2, Cap3, Cap4;
- selecting an absolute highest AWGN capacity, Cap;
- selecting a rank based on the selected absolute highest Cap;
- and
- transmitting a ranking to transmitting side which indicates the layer transmissions to select for transmission so as to maximize spectral efficiency.
A wireless communications device, comprising:
- means for calculating MIMO channel matrices corresponding to layer transmissions for each tone;
- means for calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices;
- means for mapping the SNR for each tone to generate effective SNRs for each layer transmission;
- means for calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and denoted as Cap1, Cap2, Cap3, Cap4;
- means for selecting an absolute highest AWGN capacity, Cap;
- means for selecting a rank based on the selected absolute highest Cap;
- and
- means for transmitting a ranking to a transmitting side which indicates the layer transmissions to select for transmission so as to maximize spectral efficiency.
A computer-readable media embodying instructions executable by a processor to perform a method of rank prediction to maximize spectral efficiency in a MIMO wireless communication system, the method comprising:
- calculating MIMO channel matrices corresponding to layer transmissions for each tone;
- calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices;
- mapping the SNR for each tone to generate effective SNRs for each layer transmission;
- calculating additive white Gaussian noise (AWGN) capacities corresponding to the effective SNRs and denoted as Cap1, Cap2, Cap3, Cap4;
- selecting an absolute highest AWGN capacity Cap;
- selecting a rank based on the selected absolute highest Cap;
- and
- transmitting a ranking to a transmitting side which indicates the layer transmissions to select for transmission so as to maximize spectral efficiency.
Dependencies are inferred from the claim text.