US 7,069,036 B2Granted

System and method for minimizing interference in a spot beam communication system

AssigneeThe Boeing Company

InventorKeith Jarett

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Abstract

A method and apparatus for transmitting data to a plurality of users, each individual user disposed in one of a plurality of cells is disclosed. One embodiment of the method comprises the steps of defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, defining a first group of receivers from the first set of receivers according to a first spatial isolation constraint, defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range, defining a second groups of receivers from the second set according to a second spatial isolation constraint, and assigning a first transmission channel to the first group and a second transmission channel to the second group.

Claims37

Dependent claims

A method of transmitting data to a plurality of receivers, each individual receiver disposed in one of a plurality of cells, comprising:

defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, comprising
designating a first receiver as a member of the first set if a desired power level of the signal received by the first receiver is within the first desired power level range;
and
designating a second receiver as a member of the first set if a desired power level of the signal received by the second receiver is within a first desired power level range;
defining a first group of receivers from the first set of receivers according to a first spatial isolation constraint comprising
designating the first receiver as a member of a first group;
designating the second receiver as a member of the first group if the second receiver is spatially isolated from the firs receiver;
and
rejecting the second receiver as a member of the first group if the second receiver is not spatially isolated from the first receiver;
defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range, comprising
designating a third receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is with the second desired power level range;
and
designating a fourth receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
defining a second groups of receivers from the second set according to a second spatial isolation constraint comprising
designating the third receiver as a member of a second group;
designating the fourth receiver as a member of the second group if the second receiver is spatially isolated from the third receiver;
and
rejecting the fourth receiver as a member of the second group if the fourth receiver is not spatially isolated from the third receiver;
and
assigning a first transmission channel to the first group and a second transmission channel to the second group.

17 more elements

An apparatus for transmitting data to a plurality of receivers, comprising;

means for defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, comprising
means for defining a first receiver as a member of the first set if a desire power level of the signal transmitted to the first receiver is within the first desired power level range;
and
means for designating a second receiver as a member of the first set if a desired power level of the signal transmitted to the second receiver is within a first desired power level range;
means for defining a first group of receivers from the first set of receivers according to a first spatial isolation constraint comprising
means for designing the first receiver as a member of a first group;
means for designating the second receiver as a member of the first group if the second receiver is spatially isolated from the first receiver;
and
means for rejecting the second receiver as a member of the first group if the second receiver is not spatially isolated from the first receiver;
means for defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range comprising
means for designating a third receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
means for designating a fourth receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
means for defining a second group of receivers from the second set according to a second spatial isolation constraint, comprising
means for designating the third receiver as a member of the second group;
means for designating the fourth receiver as a member of the second group if the second receiver is spatially isolated from the third receiver;
and
means for rejecting the fourth receiver as a member of the second group if the fourth receiver is not spatially isolated from the third receiver;
and
means for assigning a first transmission channel to the first group and a second transmission channel to the second group.

17 more elements

An apparatus for transmitting data to a plurality of users, each individual user disposed in one of a plurality of cells, comprising:

a processor;
and
a memory communicatively coupled to the processor, the memory storing processor instructions for defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, defining a first group of receivers from the first set of receivers according to a first spatial isolation constraint, defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range, defining a second groups of receivers from the second set according to a second spatial isolation constraint, and assigning a first transmission channel to the first group and a second transmission channel to the second group;
and wherein
the instructions for defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range comprises instructions for
designating a first receiver as a member of the set if a desired power level of the signal received by the first receiver is within the first desired power level range;
and
designating a second receiver as a member of the set if a desired power level of the signal received by the second receiver is within a first desired power level range;
the instructions for defining a first group from the first set of receivers according to a first spatial isolation constraint comprises instructions for
designating the first receiver as a member of a first group;
designating the second receiver as a member of the first group if the second receiver is spatially isolated from the first receiver;
and
rejecting the second receiver as a member of the first group if the second receiver is not spatially isolated from the first receiver;
the instructions for defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level comprises instructions for
designating a third receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
designating a fourth receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
the instructions for defining a second group of the second set according to a second spatial isolation constraint comprises instructions for
designating the third receiver as a member of a second group;
designating the fourth receiver as a member of the second group if the second receiver is spatially isolated from the third receiver;
and
rejecting the fourth receiver as a member of the second group if the fourth receiver is not spatially isolated from the third receiver.

20 more elements

A system for transmitting data to a plurality of users, each individual user disposed in one of a plurality of terrestrial cells, comprising:

an uplink facility;
a satellite for transmitting the data via spot beams;
a processor;
and
a memory, communicatively coupled to the processor, the memory storing processor instructions for defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, defining a first group of receivers from the first set of receivers according to a first spatial isolation constraint, defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range, defining a second groups of receivers from the second set according to a second spatial isolation constraint, and assigning a first transmission channel to the first group and a second transmission channel to the second group;
and wherein
the instructions for defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range comprises instructions for
designating a first receiver as a member of the set if a desired power level of the signal received by the first receiver is within the first desired power level range;
and
designating a second receiver as a member of the set if a desired power level of the signal received by the second receiver is within a first desired power level range;
the instructions for defining firs group from the first set of receivers according to a first spatial isolation constraint comprises instructions for
designating the first receiver as a member of a first group;
designating the second receiver as a member of the first group if the second receiver is spatially isolated from the first receiver;
and
rejecting the second receiver as a member of the first group if the second receiver is not spatially isolated from the first receiver;
the instructions for defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to second desired power level comprises instruction for
designating a third receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
designating a fourth receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
the instructions for defining a second group of the second set according to a second spatial isolation constraint comprises instructions for
designating the third receiver as a member of a second group;
designating the fourth receiver as a member of the second group if the second receiver is spatially isolated from the third receiver;
and
rejecting the fourth receiver as a member of the second group if the fourth receiver is nor spatially isolated from the third receiver.

22 more elements

A method of transmitting data to a plurality of receivers;

defining groups of the receivers according to desired power level range, wherein each of the receivers of the same desired power level range are spatially isolated from the other receivers of the same desired power level range;
and
assigning a transmission channel to each of the groups;
wherein the step of defining groups of receivers according to desired power level range, wherein each of the receivers of the same desired power level range are spatially isolated from the other receivers of the same desired power level range comprises the steps of,
defining a first set of receivers from at least a portion of the plurality of receivers according to a first desired power level range, comprising
designating a first receiver as a member of the first set if a desired power level of the signal received by the first receiver is within the first desired power level range;
and
designating a second receiver as a member of the first set if a desire power level of the signal received by the second receiver is within a first desired power level range;
defining the first group receivers from the first set of receivers according to a first spatial isolation constraint, comprising
designating the first receiver as a member of a first group;
designating the second receiver as a member of the first group if the second receiver is spatially isolated from the first receiver;
and
rejecting the second receiver as a member of the first group if the second receiver is not spatially isolated from the first receiver;
defining a second set of receivers from a remaining plurality of receivers not a member of the first set of receivers according to a second desired power level range, comprising
designating a third receiver as a member of the second set if a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
and
designating a fourth receiver as a member of the second set it a desired power level of the signal transmitted to the third receiver is within the second desired power level range;
defining a second groups of receivers from the second set according to a second spatial isolation constraint, comprising
designating the third receiver as a member of the second group;
designating the fourth receiver as a member of the second group if the second receiver is spatially isolated from the third receiver;
and
rejecting the fourth receiver as a member of the second group if the fourth receiver is not spatially isolated from the third receiver;
and
assigning a first transmission channel to the first group and a second transmission channel to the second group.

21 more elements

Dependencies are inferred from the claim text.