Electronic device and method for digital predistortion in wireless communication system
According to embodiments, a method performed by an electronic device includes: identifying a channel bandwidth; identifying one or more active DPD units among a plurality of DPD units of a digital pre-distortion (DPD) circuit based on the channel bandwidth and amount of resource allocated within the channel bandwidth; generating a DPD output signal of the DPD circuit based on the one or more active DPD units; generating an amplifier output signal based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA). While the DPD output signal is generated, at least one DPD unit different from the one or more active DPD units among the plurality of DPD units of the DPD circuit is deactivated.
1 . A method performed by an electronic device, the method comprising:
identifying a channel bandwidth;
identifying one or more active digital pre-distortion (DPD) units from a plurality of DPD units of a DPD circuit, based on the channel bandwidth and an amount of resources allocated within the channel bandwidth;
generating a DPD output signal of the DPD circuit based on the one or more active DPD units;
generating an amplifier output signal, based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA),
wherein at least one DPD unit among the plurality of DPD units of the DPD circuit, which is different from the one or more active DPD units, is deactivated while the DPD output signal is generated.
2 . The method of claim 1 , wherein the amount of the allocated resources is identified based on an input signal from the DPD circuit to the DAC.
3 . The method of claim 2 , wherein the input signal from the DPD circuit to the DAC is used to obtain a number of samples having a power spectral density greater than a threshold, and
wherein the amount of the allocated resources is identified based on a multiplication of:
a ratio of the number of samples having the power spectral density greater than the threshold with respect to a fast fourier transform (FFT) size, and
a sampling rate.
4 . The method of claim 1 , wherein the one or more active DPD units are identified based on a ratio of the amount of the allocated resources with respect to the channel bandwidth.
5 . The method of claim 1 , wherein the identifying of the one or more active DPD units comprises:
identifying at least one first active DPD unit based on a ratio of the amount of the allocated resources with respect to the channel bandwidth being within a first range; and
identifying at least one second active DPD unit based on a ratio of the amount of the allocated resources with respect to the channel bandwidth being within a second range higher than the first range, and
wherein a number of the at least one second active DPD unit is greater than a number of the at least one first active DPD unit.
6 . The method of claim 1 , wherein the DPD circuit comprises a finite impulse response (FIR) filter, and
wherein a length of the FIR filter corresponds to a total number of DPD units in the plurality of DPD units of the DPD circuit.
7 . The method of claim 1 , further comprising:
generating an DPD output signal of the DPD circuit based on the plurality of DPD units of the DPD circuit without a deactivated DPD unit, in case that resource blocks (RBs) corresponding to a size of the channel bandwidth are allocated.
8 . The method of claim 1 , wherein a number of terms of a polynomial of a function of each DPD unit in the one or more active DPD units is determined based on the amount of the allocated resources.
9 . The method of claim 1 ,
wherein an input signal of the PA comprises an input signal of the DAC before generating the DPD output signal, and
wherein an output signal of the PA comprises an output signal of an analog-to-digital converter (ADC) before generating the DPD output signal.
10 . The method of claim 1 , wherein the generating of the DPD output signal comprises:
transmitting, to the DPD circuit, at least one of:
a control signal to turn on a switch corresponding to each DPD unit of the one or more active DPD units, or
a control signal to turn off a switch corresponding to each DPD unit of the at least one DPD unit.
11 . An electronic device, comprising:
at least one processor comprising processing circuitry;
a digital pre-distortion (DPD) circuit;
a digital-to-analog converter (DAC); and
a power amplifier (PA),
wherein the at least one processor is individually and/or collectively configured to:
identify a channel bandwidth;
identify one or more active digital pre-distortion (DPD) units from a plurality of DPD units of the DPD circuit, based on the channel bandwidth and an amount of resources allocated within the channel bandwidth;
control the DPD circuit to generate a DPD output signal of the DPD circuit based on the one or more active DPD units;
generate an amplifier output signal, based on the DPD output signal of the DPD circuit, through the DAC, and the PA,
wherein at least one DPD unit among the plurality of DPD units of the DPD circuit, which is different from the one or more active DPD units, is deactivated while the DPD output signal is generated.
12 . The electronic device of claim 11 , wherein the amount of the allocated resources is identified based on an input signal from the DPD circuit to the DAC.
13 . The electronic device of claim 12 ,
wherein the input signal from the DPD circuit to the DAC is used to obtain a number of samples having a power spectral density (PSD) greater than a threshold, and
wherein the amount of the allocated resources is identified based on a multiplication of:
a ratio of the number of samples having the power spectral density (PSD) greater than the threshold with respect to a fast fourier transform (FFT) size, and
a sampling rate.
14 . The electronic device of claim 11 , wherein the one or more active DPD units are identified based on a ratio of the amount of the allocated resources with respect to the channel bandwidth.
15 . The electronic device of claim 14 , wherein the at least one processor, to identify the one or more active DPD units, is individually and/or collectively configured to:
identify at least one first active DPD unit based on a ratio of the amount of the allocated resources with respect to the channel bandwidth being within a first range, and
identify at least one second active DPD unit based on a ratio of the amount of the allocated resources with respect to the channel bandwidth being within a second range higher than the first range, and
wherein a number of the at least one second active DPD unit is greater than a number of the at least one first active DPD unit.
16 . The electronic device of claim 11 ,
wherein the DPD circuit comprises a finite impulse response (FIR) filter, and
wherein a length of the FIR filter corresponds to a total number of DPD units in the plurality of DPD units of the DPD circuit.
17 . The electronic device of claim 11 , wherein the at least one processor is individually and/or collectively configured to:
control the DPD circuit to generate a DPD output signal of the DPD circuit based on the plurality of DPD units of the DPD circuit without a deactivated DPD unit, in case that resource blocks (RBs) corresponding to a size of the channel bandwidth are allocated.
18 . The electronic device of claim 11 , wherein a number of terms of a polynomial of a function of each DPD unit in the one or more active DPD units is determined based on the amount of the allocated resources.
19 . The electronic device of claim 11 ,
wherein an input signal of the PA comprises an input signal of the DAC before generating the DPD output signal, and
wherein an output signal of the PA comprises an output signal of an analog-to-digital converter (ADC) before generating the DPD output signal.
20 . The electronic device of claim 11 , wherein the at least one processor, to generate the DPD output signal, is individually and/or collectively configured to transmit, to the DPD circuit, at least one of:
a control signal to turn on a switch corresponding to each DPD unit of the one or more active DPD units, or
a control signal to turn off a switch corresponding to each DPD unit of the at least one deactivated DPD unit.