System and method providing various pilot sub-carrier densities in OFDMA communications
AssigneeClearwire IP Holdings LLC
InventorsSungki Park, Masoud Olfat
Life of this patent
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Abstract
A method for varying pilot sub-carrier density in OFDMA communications is described. The method comprises calculating channel quality from sub-carriers; determining whether the channel quality is outside a threshold range; selecting a different pilot sub-carrier density for a sub-zone based on the value of the channel quality when the channel quality is outside the threshold range; and setting the sub-zone to the different pilot sub-carrier density. A system for using sub-zones with different pilot sub-carrier densities in OFDMA communications is also described.
Claims29
A method for varying pilot sub-carrier density in OFDMA communications comprising;
- calculating channel quality from sub-carriers;
- determining whether the channel quality is outside a threshold range;
- selecting a different pilot sub-carrier density for a sub-zone of an existing zone based on the value of the channel quality when the channel quality is outside the threshold range, a single type of sub-channel assignment protocol being used within the zone;
- and
- setting the sub-zone to the different pilot sub-carrier density.
A system for varying pilot sub-carrier density in OFDMA communications comprising:
- a channel quality calculator configured to calculate channel quality based on sub-carriers;
- a determiner configured to determine whether the channel quality is outside a threshold range;
- a selector configured to select a different pilot sub-carrier density for a sub-zone of an existing zone based on the value of the channel quality when the channel quality is outside the threshold range, a single type of sub-channel assignment protocol being used within the zone, and
- a scheduler configured to set the sub-zone to the different pilot subcarrier density.
A machine-readable storage device in which software is recorded, wherein the software is configured to implement a method for varying pilot sub-carrier density in OFDMA communications comprising:
- calculating channel quality from sub-carriers;
- determining whether the channel quality is outside a threshold;
- selecting a different pilot sub-carrier density for a sub-zone of an existing zone based on the value of the channel quality when the channel quality is outside the threshold, a single type of sub-channel assignment protocol being used within the zone;
- and
- setting the sub-zone to the different pilot sub-carrier density.
Dependencies are inferred from the claim text.