Mitigation of transmission errors of quantized channel state information feedback in multi antenna systems
AssigneeTR Technologies Inc.
InventorsBartosz Mielczarek, Witold A. Krzymien
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Abstract
Methods are disclosed for improving communications on feedback transmission channels, in which there is a possibility of bit errors. The basic solutions to counter those errors are: proper design of the CSI vector quantizer indexing (i.e., the bit representation of centroid indices) in order to minimize impact of index errors, use of error detection techniques to expurgate the erroneous indices and use of other methods to recover correct indices.
Claims23
A method of reducing the effect of errors in the feedback of channel state information from a receiver to a transmitter, comprising:
- choosing multiple mappings of indices to channel states;
- estimating the effect on transmission quality of feedback errors for each of the mappings of indices to channel states;
- selecting a mapping of indices to channel states to reduce the effect of feedback errors;
- and
- transmitting feedback of channel state information from the receiver to the transmitter, the receiver representing a channel state using the index determined by the selected mapping of indices to channel states.
A method of assigning indices to channel states in order to reduce the impact of errors in the feedback of channel state information from a receiver to a transmitter, comprising:
- selecting a pair of channel states that are close together according to a distance measure;
- and
- assigning indices to any channel states in the pair that have not already been assigned indices so as to minimize the Hamming distance between the indices.
A method of improving an assignment of indices to channel states in order to reduce the impact of errors in the feedback of channel state information from a receiver to a transmitter, comprising:
- selecting a pair of channel states which already have indices assigned to them;
- determining if swapping the indices assigned to the states will reduce the impact of errors in the feedback of channel state information;
- and
- reassigning the indices according to the determination of the previous step.
Dependencies are inferred from the claim text.