Modal cognitive diversity for mobile communication MIMO systems
AssigneeEthertronics, Inc.
InventorsLaurent Desclos, Sebastian Rowson, Jeffrey Shamblin, Olivier Pajona
Life of this patent
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Abstract
A system and method for optimizing the performance for MIMO are provided, the system including multiple antennas, including at least one modal antenna, wherein each of the at least one modal antenna has multiple modes corresponding to multiple radiation patterns, and a processor coupled to the multiple antennas and configured to select a mode among the multiple modes to optimize signal quality for each time interval based on a CQI by considering envelop correlation effects.
Claims15
A communication system for multiple inputs and multiple outputs (MIMO), comprising:
- a plurality of antennas, wherein each antenna of the plurality of antennas is configured to produce a radiation pattern associated therewith, and each of said radiation patterns of the plurality of antennas is associated with an antenna mode such that the plurality of antennas yields a plurality of modes;
- and
- a processor coupled to the plurality of antennas and configured to select one of the modes among the plurality of modes to optimize signal quality for each time interval based on a channel quality indicator (CQI) by considering envelope correlation effects;
- said plurality of antennas comprising one or more modal antennas, each of the one or more modal antennas having a plurality of modes corresponding to a plurality of radiation patterns associated therewith;
- wherein during a time interval, for each of the one or more modal antennas, the processor is configured to measure an instantaneous CQI of the selected mode, obtain a predicted CQI of each of the plurality of modes, and obtain a CQI improvement for each of the plurality of modes,
- wherein the CQI improvement is defined as the predicted CQI of each of the plurality of modes minus the predicted CQI of the selected mode.
A method for optimizing performance of a communication system for MIMO, comprising:
- providing a plurality of antennas, comprising one or more modal antennas, wherein each of the one or more modal antennas has a plurality of modes corresponding to a plurality of radiation patterns;
- and
- selecting a mode among the plurality of modes of each of the one or more modal antennas to optimize signal quality for each time interval based on a channel quality indicator (CQI) by considering envelope correlation effects;
- wherein the selecting during a time interval comprises:
- for each of the one or more modal antennas,
- measuring an instantaneous CQI of the selected mode;
- obtaining a predicted CQI of each of the plurality of modes;
- and
- obtaining a CQI improvement for each of the plurality of modes;
- wherein the CQI improvement is defined as the predicted CQI of each of the plurality of modes minus the predicted CQI of the selected mode.
A non-transitory computer-readable medium comprising computer readable instructions for optimizing performance of a communication system for MIMO, the communication system comprising a plurality of antennas including one or more modal antennas, wherein each of the one or more modal antennas has a plurality of modes corresponding to a plurality of radiation patterns, when executed by a computer, the computer readable instructions performing steps of:
- selecting a mode among the plurality of modes of each of the one or more modal antennas to optimize signal quality for each time interval based on a channel quality indicator (CQI) by considering envelope correlation effects,
- wherein the selecting during a time interval comprises:
- for each of the one or more modal antennas,
- measuring an instantaneous CQI of the selected mode,
- obtaining a predicted CQI of each of the plurality of modes, and
- obtaining a CQI improvement for each of the plurality of modes,
- wherein
- the CQI improvement is defined as the predicted CQI of each of the plurality of modes minus the predicted CQI of the selected mode;
- obtaining a total CQI improvement by considering the CQI improvement for each of the plurality of modes of each of the one or more modal antennas and the envelope correlation effects to select a set of modes associated with the one or more modal antennas, respectively, the set providing an optimum value of the total CQI improvement;
- comparing the optimum value of the total CQI improvement to a predetermined threshold;
- and
- switching the one or more modal antennas to have the selected set of modes, respectively, if the optimum value of the total CQI improvement is larger than the predetermined threshold.
A non-transitory computer-readable medium comprising computer readable instructions for optimizing performance of a communication system, the communication system comprising a plurality of ports, the plurality of ports having a plurality of modes;
- when executed by a computer, the computer readable instructions performing steps of:
- selecting a mode among the plurality of modes of each of the one or more ports to optimize signal quality for each time interval based on a channel quality indicator (CQI) by considering envelope correlation effects,
- wherein the selecting during a time interval comprises:
- for each of the plurality of ports,
- measuring an instantaneous CQI of the selected mode,
- obtaining a predicted CQI of each of the plurality of modes, and
- obtaining a CQI improvement for each of the plurality of modes,
- wherein
- the CQI improvement is defined as the predicted CQI of each of the plurality of modes minus the predicted CQI of the selected mode;
- obtaining a total CQI improvement by considering the CQI improvement for each of the plurality of modes of each of the plurality of ports and the envelope correlation effects to select a set of modes associated with the plurality of ports, respectively, the set providing an optimum value of the total CQI improvement;
- comparing the optimum value of the total CQI improvement to a predetermined threshold;
- and
- switching the plurality of ports to have the selected set of modes, respectively, if the optimum value of the total CQI improvement is larger than the predetermined threshold.
Dependencies are inferred from the claim text.