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US 2009/0022254 A1Published application
Physical carrier to interference-plus-noise ratio techniques for wideband wireless communication networks
AssigneeCisco Technology, Inc.
InventorsYanxin Na, Hang Jin
Life of this patent
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Abstract
Techniques are provided to compute the physical carrier to interference-plus-noise ratio (PCINR) in a wireless communication system. In one embodiment, the PCINR is computed from received signals in active subcarriers in a preamble of a wireless transmission frame. In another embodiment, the PCINR is computed from a block of contiguous subcarriers in a symbol of received wireless transmission. The PCINR may be used to adjust a system parameter associated with wireless communication between wireless communication devices.
Claims19
A method comprising:
- receiving wireless transmission frames;
- for each frame:
- store data representing a first vector of received signals in active subcarriers;
- detecting a preamble and storing data representing a second vector for a code in the active subcarriers;
- compute an estimate of a sum of signal power and interference-plus-noise power from the first and second vectors;
- compute an estimate of the signal power from the first and second vectors;
- and
- compute an estimate of the interference-plus-noise power from the sum and the estimate of the signal power;
- computing a physical carrier to interference-plus-noise ratio from the estimate of the signal power and the estimate of the interference-plus-noise power;
- and
- adjusting a system parameter associated with wireless communication between wireless communication devices based on the physical carrier to interference-plus-noise ratio.
8 more elements
An apparatus comprising:
- a receiver that is configured to receive wireless transmission frames;
- a controller coupled to the receiver, wherein the controller is configured to:
- for each frame:
- store data representing a first vector of received signals in active subcarriers;
- detect a preamble and storing data representing a second vector for a code in the active subcarriers;
- compute an estimate of a sum of signal power and interference-plus-noise power from the first and second vectors;
- compute an estimate of the signal power from the first and second vectors;
- compute an estimate of the interference-plus-noise power from the sum and the estimate of the signal power;
- compute a physical carrier to interference-plus-noise ratio from the estimate of the signal power and the estimate of the interference-plus-noise power.
6 more elements
Logic encoded in one or more tangible media for execution and when executed operable to:
- for each received frame of a wireless transmission:
- store data representing a first vector of received signals in active subcarriers;
- detect a preamble and storing data representing a second vector for a code in the active subcarriers;
- compute an estimate of a sum of signal power and interference-plus-noise power from the first and second vectors;
- compute an estimate of the signal power from the first and second vectors;
- and
- compute an estimate of the interference-plus-noise power from the sum and the estimate of the signal power;
- compute a physical carrier to interference-plus-noise ratio from the estimate of the signal power and the estimate of the interference-plus-noise power;
- and
- adjust a system parameter associated with wireless communication between wireless communication devices based on the physical carrier to interference-plus-noise ratio.
7 more elements
A method comprising:
- receiving wireless transmissions that include pilot signals in subcarriers;
- for each block of contiguous subcarriers in a symbol:
- storing data representing received pilot signals in subcarriers;
- computing an estimate of a sum of estimated signal power and estimated interference-plus-noise power from the received pilot signals;
- computing a difference between received pilot signals in adjacent subcarriers;
- computing an estimate of the interference-plus-noise power from the difference;
- computing an estimate of the signal power from the sum and the estimate of the interference-plus-noise power;
- computing a physical carrier to interference-plus-noise ratio from the estimate of the signal power and the estimate of the interference-plus-noise power;
- adjusting a system parameter associated with wireless communication between wireless communication devices based on the physical carrier to interference-plus-noise ratio.
6 more elements
Logic encoded in one or more tangible media for execution and when executed operable to:
- for each block of contiguous subcarriers in a symbol contained in a wireless transmission:
- storing data representing received pilot signals in subcarriers;
- computing an estimate of a sum of estimated signal power and estimated interference-plus-noise power from the received pilot signals;
- computing a difference between received pilot signals in adjacent subcarriers;
- computing an estimate of the interference-plus-noise power from the difference;
- computing an estimate of the signal power from the sum and the estimate of the estimate of the interference-plus-noise power;
- computing a physical carrier to interference-plus-noise ratio from the estimate of the signal power and the estimate of the interference-plus-noise power;
- adjusting a system parameter associated with wireless communication between wireless communication devices based on the physical carrier to interference-plus-noise ratio.
5 more elements
Dependencies are inferred from the claim text.