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US 8,275,320 B1Granted
Methods and systems for channel estimation in a wireless communication network
AssigneeAdaptix, Inc.
InventorsGuanbin Xing, Manyuan Shen, Xun Shao
Life of this patent
Estimating the term…
Abstract
Methods and systems for improved channel estimation that jointly consider interference contributions and noise contributions separately. Associated method involve measuring pilot channel signals at a receiver and then determining what component of the measured pilot channel signals are attributable to a serving BS and what component of the measured pilot channel signals are attributable to an interfering BS. This information is used to determine a product of the pilot channel signals attributable to the serving BS and the pilot channel signal attributable to the interfering BS, where the found product is used to estimate said channel.
Claims18
A wireless communication network channel estimation method, said method comprising:
- measuring pilot signals at a receiver;
- determining a first portion of said measured pilot signals attributable to a serving transmitter;
- determining at least one second portion of said measured pilot signals attributable to at least one interfering transmitter;
- estimating data subcarrier responses of said serving transmitter and said at least one interfering transmitter from said determined first portion and said determined at least one second portion, respectively, said estimating said data subcarrier responses including tracking signal-to-kth-interference ratios (1/S/Rk) from said at least one interfering transmitter, said tracking said signal-to-kth interference ratios (1/SIRk) including using a minimum mean square error channel estimation which includes solving
- ∑
- k
- =
- 2
- K
-
- 1
- SIR
- k
-
- D
- k
-
- R
- pp
-
- D
- k
- wherein Dk is a product of said determined first portion and a kth determined portion of said determined at least one second portion, K is the number of said at least one interfering transmitter plus one, Rpp is a correlation matrix between pilot locations, and SNR is a signal-to-noise ratio of said measured pilot signals;
- and
- reducing interference from said at least one interfering transmitter on signals from said serving transmitter by utilizing said estimating said data subcarrier responses.
22 more elements
A non-transitory computer readable medium containing program instructions for controlling certain aspects of a wireless communication network, said program instructions comprising code for:
- measuring pilot signals at a receiver;
- determining a first portion of said measured pilot signals attributable to a serving transmitter;
- determining at least one second portion of said measured pilot signals attributable to at least one interfering transmitter;
- estimating data subcarrier responses of said serving transmitter and said at least one interfering transmitter from said determined first portion and said determined at least one second portion, respectively, said estimating said data subcarrier responses including tracking signal-to-kth-interference ratios (1/S/Rk) from said at least one interfering transmitter, said tracking said signal-to-kth-interference ratios (1/S/Rk) including using a minimum mean square error channel estimation which includes solving
- ∑
- k
- =
- 2
- K
-
- 1
- SIR
- k
-
- D
- k
-
- R
- pp
-
- D
- k
- wherein Dk is a product of said determined first portion and a kth determined portion of said determined at least one second portion, K is the number of said at least one interfering transmitter plus one, Rpp is a correlation matrix between pilot locations, and SNR is a signal-to-noise ratio of said measured pilot signals;
- and
- reducing interference from said at least one interfering transmitter on signals from said serving transmitter by utilizing estimated data subcarrier responses from said estimating said data subcarrier responses.
22 more elements
A wireless communication network channel estimation method, said method comprising:
- measuring noise levels at one or more pilot channels;
- determining at least one first portion corresponding to at least one serving transmitter at said one or more pilot channels;
- determining at least one second portion of said measured noise levels at said one or more pilot channels attributable to at least one interfering transmitter;
- isolating said determined at least one second portion from said measured noise levels;
- estimating data subcarrier responses of said at least one interfering transmitter from said determined portion, said estimating said data subcarrier responses including tracking signal-to-kth-interference ratios (1/S/Rk) from said at least one interfering transmitter, said tracking said signal-to-kth-interference ratios (1/S/Rk) including using a minimum mean square error channel estimation which includes solving
- ∑
- k
- =
- 2
- K
-
- 1
- SIR
- k
-
- D
- k
-
- R
- pp
-
- D
- k
- wherein Dk is a product of said determined first portion and a kth determined portion of said determined at least one second portion, K is the number of said at least one interfering transmitter plus one, Rpp is a correlation matrix between pilot locations, and SNR is a signal-to-noise ratio of said measured pilot signals;
- adding said estimated data subcarrier responses of said interfering transmitter to other estimated data subcarrier responses to improve channel estimation;
- and
- reducing interference from said at least one interfering transmitter on signals from said at least one serving transmitter by utilizing said improved channel estimation.
24 more elements
A wireless unit, said unit comprising:
- circuitry adapted for measuring signal levels at one or more pilot channels;
- circuitry adapted for determining a first portion of said measured signal levels attributable to a serving transmitter;
- circuitry adapted for determining at least one second portion of said measured signal levels at said one or more pilot channels attributable to at least one interfering transmitter;
- circuitry adapted for isolating said determined first portion from said measured signal levels;
- circuitry adapted for estimating data subcarrier responses of said at least one interfering transmitter from said determined at least one second portion, said circuitry adapted for estimating said data subcarrier responses being adapted for tracking signal-to-kth-interference ratios (1/S/Rk) from said at least one interfering transmitter using a minimum mean square error channel estimation which includes solving
- ∑
- k
- =
- 2
- K
-
- 1
- SIR
- k
-
- D
- k
-
- R
- pp
-
- D
- k
- wherein Dk is a product of said determined first portion and a kth determined portion of said at least one determined second portion, K is the number of said at least one interfering transmitter plus one, Rpp is a correlation matrix between pilot locations, and SNR is a signal-to-noise ratio of said measured pilot signals.
21 more elements
Dependencies are inferred from the claim text.