Quantized channel state information prediction in multiple antenna systems
AssigneeTR Technologies Inc.
InventorsBartosz Mielczarek, Witold Krzymien
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Abstract
A CSI vector quantizer (VQ) system is provided for time-correlated channels. The VQ system operates a receiver forwarding quantized channel state information in the form of indices and a transmitter predicting channel state change. The VQ system is aimed at feedback channels, in which bit errors, erasures and delays can occur. The VQ system uses transmitter-side channel prediction algorithms that work with the quantized CSI information and allow the system to recover from feedback channel transmission errors, erasures and delays. Moreover, the techniques can be used to lower the required feedback rate, while keeping the system's throughput at the required level.
Claims40
A method of compensating for feedback delay in a multiple antenna communication system having multiple channels, the communication system including a transmitter with an associated processor, the method comprising the steps of:
- receiving at the processor a sequence of indices representing channel states;
- the processor predicting a further index representing a channel state using a record of frequencies of patterns of actual or simulated feedback;
- and
- using the predicted further index representing a channel state to select a mode of modulation of information transmitted by the transmitter over the multiple channels.
A method of compensating for feedback erasure in a multiple antenna communication system having multiple channels, the communication system including a transmitter with an associated processor, the method comprising the steps of:
- receiving at the processor a sequence of indices representing channel states;
- the processor predicting a further index representing a channel state using a record of frequencies of patterns of actual or simulated feedback;
- and
- using the predicted further index representing a channel state to select a mode of modulation of information transmitted by the transmitter over the multiple channels.
A method of compensating for feedback error in a multiple antenna communication system having multiple channels, the communication system including a transmitter with an associated processor, the method comprising the steps of:
- receiving at the processor a sequence of indices representing channel states;
- the processor predicting a further index representing a channel state using a record of frequencies of patterns of actual or simulated feedback;
- receiving feedback at the processor concerning a channel state;
- determining whether a feedback error occurred using one or more of the methods of:
- (a) using an error detecting code;
- or
- (b) predicting the channel state and determining whether the feedback agrees with the prediction;
- if it is determined that a feedback error occurred, determining what the feedback would have been without the feedback error;
- and
- using the determined feedback to select a mode of modulation of information transmitted by the transmitter over the multiple channels.
Dependencies are inferred from the claim text.