US2016028433A1PendingUtilityA1
Method and apparatus for digital predistortion for a switched mode power amplifier
Est. expiryMar 10, 2034(~7.6 yrs left)· nominal 20-yr term from priority
H04B 1/0475H04B 2001/0425H03F 3/217H03F 1/3247H04L 25/03012H04L 25/49H04L 25/03343H04B 1/62H03F 1/3241
47
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Claims
Abstract
A method includes receiving an input signal and predistorting a baseband representation of the input signal at a carrier frequency and at one or more harmonic frequencies. The method also includes generating an output signal based on the predistorted baseband representation of the input signal, and transmitting the output signal to a power amplifier. Predistorting the baseband representation of the input signal at the carrier frequency could occur in parallel with predistorting the baseband representation of the input signal at the one or more harmonic frequencies.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method comprising:
receiving an input signal; predistorting a baseband representation of the input signal at a carrier frequency and at one or more harmonic frequencies; generating an output signal based on the predistorted baseband representation of the input signal; and transmitting the output signal to a power amplifier.
2 . The method of claim 1 , wherein predistorting the baseband representation of the input signal at the carrier frequency occurs in parallel with predistorting the baseband representation of the input signal at the one or more harmonic frequencies.
3 . The method of claim 1 , wherein the output signal comprises a sum of (i) the baseband representation of the input signal predistorted at the carrier frequency and (ii) the baseband representation of the input signal predistorted at the one or more harmonic frequencies.
4 . The method of claim 1 , wherein the one or more harmonic frequencies comprise a first harmonic frequency and a second harmonic frequency.
5 . The method of claim 1 , wherein predistorting the baseband representation of the input signal at the carrier frequency comprises using a formula of:
y
~
(
n
)
=
∑
l
x
~
(
n
-
l
)
LUT
l
[
x
~
(
n
-
l
)
2
]
where {tilde over (x)}(n) represents the baseband representation of the input signal, {tilde over (y)}(n) represents the predistorted baseband representation of the input signal at the carrier frequency, and LUT l represents a value from a lookup table.
6 . The method of claim 1 , wherein the power amplifier comprises a switched mode power amplifier.
7 . An apparatus comprising:
a digital predistortion block comprising:
a first processing unit configured to receive an input signal and predistort a baseband representation of the input signal at a carrier frequency; and
second processing units configured to receive the input signal and predistort a baseband representation of the input signal at one or more harmonic frequencies;
the digital predistortion block configured to generate an output signal based on the predistorted baseband representation of the input signal and transmit the output signal to a power amplifier.
8 . The apparatus of claim 7 , wherein the first processing unit and the second processing units are configured to receive the input signal and operate in parallel.
9 . The apparatus of claim 7 , wherein the digital predistortion block is configured to generate the output signal by summing a predistorted output signal from the first processing unit and predistorted output signals from the second processing units.
10 . The apparatus of claim 7 , wherein the one or more harmonic frequencies comprise a first harmonic frequency and a second harmonic frequency.
11 . The apparatus of claim 7 , wherein the first processing unit is configured to predistort the input signal at the carrier frequency using a formula of:
y
~
(
n
)
=
∑
l
x
~
(
n
-
l
)
LUT
l
[
x
~
(
n
-
l
)
2
]
where {tilde over (x)}(n) represents the baseband representation of the input signal, {tilde over (y)}(n) represents the predistorted baseband representation of the input signal at the carrier frequency, and LUT l represents a value from a lookup table.
12 . The apparatus of claim 7 , wherein the digital predistortion block is configured to transmit the output signal to a switched mode power amplifier.
13 . A non-transitory computer readable medium encoded with computer-executable instructions that when executed cause at least one processing device to:
receive an input signal; predistort a baseband representation of the input signal at a carrier frequency and at one or more harmonic frequencies; generate an output signal based on the predistorted baseband representation of the input signal; and transmit the output signal to a power amplifier.
14 . The non-transitory computer readable medium of claim 13 , wherein the predistortion of the baseband representation of the input signal at the carrier frequency comprises using a formula of:
y
~
(
n
)
=
∑
l
x
~
(
n
-
l
)
LUT
l
[
x
~
(
n
-
l
)
2
]
where {tilde over (x)}(n) represents the baseband representation of the input signal, {tilde over (y)}(n) represents the predistorted baseband representation of the input signal at the carrier frequency, and LUT l represents a value from a lookup table.Join the waitlist — get patent alerts
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