US 8,542,766 B2Granted

Time alignment algorithm for transmitters with EER/ET amplifiers and others

AssigneeSamsung Electronics Co., Ltd.

InventorsIgor Chekhovstov, Khalil Haddad

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Abstract

An apparatus and method for aligning input and feedback signals in a transmission circuit are provided. The method includes capturing an input signal and a feedback signal, determining a first time delay between the input signal and the feedback signal, determining a second time delay between the input signal and the feedback signal, the determination of the second time delay having a higher resolution than the determination of the first time delay, and applying the first time delay and the second time delay to temporally align the input signal with the feedback signal. Use of the present invention provides an improved resolution of time alignment while reducing the overall complexity and cost of the transmission circuit.

Claims12

Dependent claims

A method for amplifying a transmission signal by a non-linear power amplifier, the method comprising:

capturing an input signal and a feedback signal;
determining a first time delay between the input signal and the feedback signal;
determining, by a first number of filters, a second time delay between the input signal and the feedback signal, the determination of the second time delay having a higher resolution than the determination of the first time delay;
determining a first Measure of Error (ME) for each of the first number of filters using one equation selected from among the following equations:
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(
R
⁡
(
m
)
⁢
F
*
(
m
)
)
(
∑
m
=
1
N
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
R
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(
m
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
2
)
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∑
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1
N
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
F
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(
m
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2
)
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for
⁢
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1
≤
i
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S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
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(
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)
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∑
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∑
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1
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
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(
m
)

2
)
⁢
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for
⁢
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1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(

I
R
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)
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I
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+
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-
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)
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for
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1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
⁢
ME
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(
i
)
=
∑
m
=
1
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
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)
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for
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1
≤
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≤
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wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, and
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(

angle
⁡
(
R
⁡
(
m
)
)
-
angle
⁡
(
F
⁡
(
m
)
)

)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal;
and
applying the first time delay and the second time delay to temporally align the input signal with the feedback signal.

298 more elements

An apparatus for amplifying a transmission signal, the apparatus comprising:

a controller for capturing an input signal and a feedback signal, for determining a first time delay between the input signal and the feedback signal, and for determining a second time delay between the input signal and the feedback signal, the determination of the second time delay having a higher resolution than the determination of the first time delay;
a first integer delay for applying the first time delay;
and
a first fractional delay comprising a first number of filters for applying the second time delay,
wherein the first integer delay and the first fractional delay respectively apply the first time delay and the second time delay to temporally align the input signal with the feedback signal,
wherein the controller determines a first Measure of Error (ME) for each of the first number of filters using one equation selected from among the following equations:
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(
R
⁡
(
m
)
⁢
F
*
(
m
)
)
(
∑
m
=
1
N
⁢

R
⁡
(
m
)

2
)
⁢
(
∑
m
=
1
N
⁢

F
⁡
(
m
)

2
)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(
R
⁡
(
m
)
⁢
F
*
(
m
)
)
(
∑
m
=
1
N
⁢

R
⁡
(
m
)

2
)
⁢
(
∑
m
=
1
N
⁢

F
⁡
(
m
)

2
)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(

I
R
⁡
(
m
)
-
I
F
⁡
(
m
)

+

Q
R
⁡
(
m
)
-
Q
F
⁡
(
m
)

)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal,
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(

R
⁡
(
m
)

-

F
⁡
(
m
)

)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal, and
min
i
⁢
ME
⁡
(
i
)
=
∑
m
=
1
N
⁢
(

angle
⁡
(
R
⁡
(
m
)
)
-
angle
⁡
(
F
⁡
(
m
)
)

)
⁢
⁢
for
⁢
⁢
1
≤
i
≤
S
wherein R(m) denotes the input signal, F(m) denotes the feedback signal, S denotes the first number of filters, and N denotes an amount of data captured from the input signal and the feedback signal.

298 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/097,844Filed 29 Apr 2011 · us provisional application
Priority: 4 May 2010
Published: US 2011/0274210 A110 Nov 2011
Granted: 24 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 27/368
Using predistortion: adaptive predistortion
H03F 1/3247
Using predistortion circuits: using feedback acting on predistortion circuits
H03F 3/24
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers: of transmitter output stages
H03F 2200/451
Indexing scheme relating to amplifiers: the amplifier being a radio frequency amplifier

Family

Application61/331,267Us provisional application · filed 4 May 2010
US 2011/0274210 A1Pre-grant publication · published 10 Nov 2011
US 8,542,766 B2This patent

From the US filing history. Foreign family members aren’t listed.

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