Tap weight initializer for an adaptive equalizer
AssigneeZenith Electronics Corporation
InventorsMark Fimoff, Serdar Ozen, Michael D. Zoltowski
Life of this patent
Estimating the term…
Abstract
Initial values of the tap weights for the taps of a linear equalizer are determined based on a channel impulse response of a channel so that the values corresponding to the weights of the equalizer taps achieve optimum initialization of the equalizer. These values are determined through use of a nested summation where the number of summations is dependent upon the number of multi-paths characterizing the channel.
Claims28
A method for determining the initial values of the tap weights for the taps wherein the nested summation has the following general form:
- ∑
- k
- 0
- =
- a
- k
- 0
- max
-
-
- ∑
- k
- 1
- =
- b
- k
- 1
- max
-
-
- …
-
-
- ∑
- k
- m
- -
- 1
- =
- n
- k
- m
- -
- 1
- max
-
-
- f
- (
- k
- 0
- ,
- k
- 1
- ,
- …
-
-
- k
- m
- -
- 1
- )
- Wherein a, b, . . . , n are initial summing points for the corresponding summations, and wherein m>1 such that if m=2 there are only two summations and such that if m>2 there are more than two summations of a linear equalizer comprising:
- determining a channel impulse response of a channel;
- and,
- performing a nested summation to determine, from the channel impulse response, the initial values corresponding to the weights of the equalizer taps.
A method for determining values for the tap weights of the taps of a linear equalizer wherein the nested summation has the following general form:
- ∑
- k
- 0
- =
- a
- k
- 0
- max
-
-
- ∑
- k
- 1
- =
- b
- k
- 1
- max
-
-
- …
-
-
- ∑
- k
- m
- -
- 1
- =
- n
- k
- m
- -
- 1
- max
-
-
- f
- (
- k
- 0
- ,
- k
- 1
- ,
- …
-
-
- k
- m
- -
- 1
- )
- Wherein a, b, . . . , n are initial summing points for the corresponding summations, and wherein m>1 such that if m=2 there are only two summations and such that if m>2 there are more than two summations comprising:
- determining a channel impulse response of a channel;
- and,
- performing a nested summation to determine from the channel impulse response only values corresponding to the weights of the equalizer taps necessary to achieve optimum initialization of the equalizer.
A method for determining values for the tap weights of the taps of a linear equalizer wherein the nested summation has the following general form:
- ∑
- k
- 0
- =
- a
- k
- 0
- max
-
-
- ∑
- k
- 1
- =
- b
- k
- 1
- max
-
-
- ⋯
-
- ∑
- k
- m
- -
- 1
- =
- n
- k
- m
- -
- 1
- max
-
-
- f
-
- (
- k
- 0
- ,
- k
- 1
- ,
- …
-
-
- k
- m
- -
- 1
- )
- Wherein a, b, . . . , n are initial summing points for the corresponding summations, and wherein m>1 such that if m=2 there are only two summations and such that if m>2 there are more than two summations comprising:
- cross-correlating data received over a channel with a stored representation of the data as transmitted so as to produce a correlation vector, wherein the correlation vector is characterized by a known noise component resulting from the finiteness of the correlation;
- subtracting the known noise component from the correlation vector so as to produce a channel impulse response related to the channel;
- and,
- performing a nested summation to determine from the channel impulse response only values corresponding to the weights of the equalizer taps necessary to achieve optimum initialization of the equalizer.
A method for determining initial values for tap weights to be applied to taps of a linear equalizer wherein the nested summation has the following general form:
- ∑
- k
- 0
- =
- a
- k
- 0
- max
-
-
- ∑
- k
- 1
- =
- b
- k
- 1
- max
-
-
- ⋯
-
-
- ∑
- k
- m
- -
- 1
- =
- n
- k
- m
- -
- 1
- max
-
-
- f
-
- (
- k
- 0
- ,
- k
- 1
- ,
- …
-
-
- k
- m
- -
- 1
- )
- Wherein a, b, . . . , n are initial summing points for the corresponding summations, and wherein m>1 such that if m=2 there are only two summations and such that if m>2 there are more than two summations comprising:
- determining a channel impulse response of a channel;
- and,
- performing a nested summation on the channel impulse response to determine the initial values for the tap weights to be applied to the taps of the linear equalizer.
Dependencies are inferred from the claim text.