CN107835140B - The digital pre-distortion system and its method of biobelt power amplifier are sent out altogether - Google Patents
The digital pre-distortion system and its method of biobelt power amplifier are sent out altogether Download PDFInfo
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Abstract
The invention discloses a kind of digital pre-distortion systems for sending out biobelt power amplifier altogether, including digital pre-distortion block, the base band power amplifier input signal of two frequency ranges generates two digital pre-distortion block output signals after passing through digital pre-distortion block respectively, first digital pre-distortion block output signal and the first local oscillator pass through the first frequency mixer generation first via output signal, second digital pre-distortion block output signal and the second local oscillator pass through the second frequency mixer the second tunnel output signal of generation, two-way output signal synthesizes biobelt signal by two-way synthesizer, after biobelt signal passes through preamplifier and power amplifier respectively, a part of power amplifier output signal obtains the first base band power amplifier output signal and the second base band power amplifier output signal and feeds back to digital pre-distortion block by output feedback module.The invention also discloses the digital pre-distortion methods of total hair biobelt power amplifier.Present invention reduces computational complexities, reduce the consuming of hardware resource, have higher stability.
Description
Technical field
The present invention relates to the digital linearization technologies of power amplifier, send out biobelt power amplifier altogether more particularly to a kind of
Digital pre-distortion system and its method.
Background technique
The fast development of wireless communication system results in the completely new demand for power amplifier.On the one hand, multiband, more
The base station of communication standard is further universal, results in total hair mostly with the generation of power amplifier.It is compared with the power amplifier of single band operation, this field
Scape linearly proposes increasingly complex requirement to power amplifier --- all has in multiple working frequency range preferable linear.And it is another
Aspect, due to the requirement of high-power high-efficiency, power amplifier inevitably works in nonlinear state.Digital pre-distortion technology is one
Kind is widely used in the highly effective method of compensation non-linearity of power amplifier in engineering practice, makees frequency suitable for having both multiplexing
The linearization procedure of the power amplifier of section and the two features of high power.
By taking concurrent biobelt power amplifier as an example, firstly, in order to obtain good linearisation effect, in each frequency band,
Distorted signals is not only caused by power amplifier self character, is also influenced by another band signal crossmodulation bring；Secondly, high
Under power efficient working condition, the nonlinear degree of power amplifier will be higher, and the distorted signals of output end is even more serious.
Linearisation for total hair biobelt power amplifier, modeling and the realization difficult point of input signal predistortion essentially consist in total hair
Biobelt signal not only produces in itself to be distorted with interior high-order, will also generate serious crosstalk between two signals.It will be above-mentioned
Two kinds are distorted a kind of power amplifier behavioral trait model taken into account and can be described with following formula.
Wherein, M is the maximum value of memory depth, and m is memory depth, and K is the order of high-order nonlinear distortion；y(1)(n) and
y(2)It (n) is n-th of amount of corresponding baseband output signal sequence, x(1)(n) and x(2)It (n) is biobelt base-band input signal sequence
N-th of amount, a, b indicate (1), the corresponding power amplifier characteristic coefficient of (2) a frequency band, | | indicate modulus value operation.Specifically, | x(1)(n-m) | and | x(2)(n-m) | be memory depth be m, the modulus value of biobelt base-band input signal n-th of amount of sequence.
Although the above method is effective, it is widely applied in real figure pre-distortion system, still exists
More disadvantage.For example, complicated power amplifier characteristic needs biggish memory depth value, non-linear order value to be fitted, and
With the increase of order, power operation is greatly increased, and occupies great amount of hardware resources, and arithmetic speed slows down with efficiency；Meanwhile it is practical
Normalized signal sequence is often used in, with the increase of order, the power value of signal will be smaller and smaller, unavoidably
Ground results in fluctuating widely for its coefficient of correspondence, i.e. the stability of model is poor, and order is excessively high, and to may cause operation not convergent
Problem.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of total hair biobelts for being able to solve defect existing in the prior art
The digital pre-distortion system and its method of power amplifier.
Technical solution: to reach this purpose, the invention adopts the following technical scheme:
The digital pre-distortion system of the present invention for sending out biobelt power amplifier altogether, including digital pre-distortion block, two
The base band power amplifier input signal of a frequency range generates two digital pre-distortion block outputs after passing through digital pre-distortion block respectively
Signal, the first digital pre-distortion block output signal and the first local oscillator generate first via output signal by the first frequency mixer, the
Two digital pre-distortion block output signals and the second local oscillator pass through the second frequency mixer the second tunnel output signal of generation, two-way output letter
Number by two-way synthesizer synthesize biobelt signal, after biobelt signal passes through preamplifier and power amplifier respectively, a part
Power amplifier output signal obtains the first base band power amplifier output signal and the output of the second base band power amplifier by output feedback module
Signal simultaneously feeds back to digital pre-distortion block.
Further, first local oscillator is different with the frequency of the second local oscillator.
The digital pre-distortion method of the present invention for sending out biobelt power amplifier altogether, comprising the following steps:
S1: the base band power amplifier input signal of two frequency ranges is inputted into digital pre-distortion block, digital pre-distortion block respectively
Straight-through, two digital pre-distortion block output signals of generation are the base band power amplifier input signal of two frequency ranges；
S2: by the different local oscillator of two frequency mixers and two frequencies, by the base band power amplifier input signal tune of two frequency ranges
In radio-frequency region needed for making power amplifier, two-way output signal is generated；
S3: the two-way output signal that step S2 is obtained synthesizes biobelt signal, biobelt signal difference by two-way synthesizer
After preamplifier and power amplifier, a part of power amplifier output signal obtains first by output feedback module
Base band power amplifier output signal and the second base band power amplifier output signal simultaneously feed back to digital pre-distortion block；
S4: digital pre-distortion block extracts digital pre-distortion block coefficient；
The digital pre-distortion block coefficient that the base band power amplifier input signal of S5: two frequency ranges is obtained using step S4, passes through
Refresh digital pre-distortion block and obtain two digital pre-distortion block output signals, repeats step S2-S5, iteration 3-4 times.
Further, when carrying out step S4, digital pre-distortion block extracts number using model formation shown in formula (1) and (2)
Word predistortion module coefficient:
Wherein, x(1)It (n) is n-th of amount of the base band power amplifier input signal of the first frequency range, x(2)It (n) is the base of the second frequency range
N-th of amount with power amplifier input signal,It is extracted after feeding back to digital pre-distortion block for the first base band power amplifier output signal
Digital pre-distortion coefficientI-th son amount,Digital pre-distortion block is fed back to for the first base band power amplifier output signal
The digital pre-distortion coefficient extracted afterwardsJ-th son amount,It is fed back to for the first base band power amplifier output signal digital pre-
The digital pre-distortion coefficient extracted after distortion moduleS-th son amount,For the first base band power amplifier output signal feedback
The digital pre-distortion coefficient extracted after to digital pre-distortion blockT-th son amount,For the output of the second base band power amplifier
Signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockI-th son amount,For the second base band
Power amplifier output signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockJ-th son amount,For
Second base band power amplifier output signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockS-th son
Amount,The digital pre-distortion coefficient extracted after digital pre-distortion block is fed back to for the second base band power amplifier output signal's
T-th of son amount, m are memory depth, and M is the maximum value of memory depth, y(1)It (n) is n-th of the first base band power amplifier output signal
Amount,For i-th of son amount of the n-th-m amounts of the first base band power amplifier output signal, y(2)It (n) is the second base band function
N-th of amount of output signal is put,I-th of son for the n-th-m amounts of the second base band power amplifier output signal is measured, |
y(1)(n-m)|jJ-th of son for the modulus value of the n-th-m amounts of the first base band power amplifier output signal is measured, | y(2)(n-m)|jIt is second
J-th of son amount of the modulus value of the n-th-m amounts of base band power amplifier output signal, psIt (n-m) is s-th of the n-th-m of p (n) amounts
Son amount, qtIt (n-m) is t-th of son amounts of the n-th-m amount of q (n), p (n) and q (n) are respectively as shown in formula (3) and (4), N1It is
The son amount sum of n-th-m amounts of one base band power amplifier output signal, N2For the n-th-m amount of the second base band power amplifier output signal
The son amount sum of modulus value, N3For the son amount sum of the n-th-m amounts of p (n), N4For the son amount sum of the n-th-m amounts of q (n)；
P (n)=| y(1)(n)|+|y(2)(n)| (3)
Q (n)=| y(1)(n)|-|y(2)(n)| (4)。
Further, when the z times progress step S5,1 < z≤iteration total degree, digital pre-distortion block using formula (5) and
(6) model formation shown in calculates digital pre-distortion block output signal:
Wherein,For n-th of amount of the first digital pre-distortion block output signal,It is pre- for the second number
N-th of amount of distortion module output signal,For the n-th-m amounts of the base band power amplifier input signal of the first frequency range
I-th son amount,I-th of son for the n-th-m amounts of the base band power amplifier input signal of the second frequency range is measured, | x(2)(n-m)|jJ-th of son for the modulus value of the base band power amplifier input signal of the second frequency range is measured, | x(1)(n-m)|jFor the first frequency range
J-th of son amount of the modulus value of base band power amplifier input signal, usIt (n-m) is s-th of son amount of the n-th-m of u (n) amounts, vt(n-m)
For t-th of son amount of the n-th-m amounts of v (n), u (n) and v (n) is respectively as shown in formula (7) and (8)；
U (n)=| x(1)(n)|+|x(2)(n)| (7)
V (n)=| x(1)(n)|-|x(2)(n)| (8)。
The utility model has the advantages that the present invention with additive, the thought of subtraction and segmentation replace conventional digital predistortion and power amplifier linearization
A large amount of power operation, reduces computational complexity in technology, reduces the consuming of hardware resource, and have higher stability,
Good power amplifier linearization effect is obtained simultaneously.
Detailed description of the invention
Fig. 1 is the block diagram of system in the specific embodiment of the invention；
Fig. 2 is the schematic diagram of formula (5) in the specific embodiment of the invention；
Fig. 2 (a) is the functional block diagram that formula (5) are realized；
Fig. 2 (b) is the realization principle figure of " segmentation+memory " module in Fig. 2 (a)；
Fig. 3 be the specific embodiment of the invention apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth be
The S-band of 160MHz sends out the normalization input-output amplitude characteristic (AM-AM) and phase characteristic (AM- of biobelt power amplifier altogether
PM) curve graph；
Fig. 3 (a) is curve graph of the center frequency in 1.8GHz；
Fig. 3 (b) is curve graph of the center frequency in 2.5GHz；
Fig. 4 be the specific embodiment of the invention apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth be
The S-band of 160MHz sends out the normalized power spectral density curve graph of biobelt power amplifier altogether；
Fig. 4 (a) is curve graph of the center frequency in 1.8GHz；
Fig. 4 (b) is curve graph of the center frequency in 2.5GHz.
Specific embodiment
Technical solution of the present invention is further introduced with attached drawing With reference to embodiment.
Present embodiment discloses the digital pre-distortion system of total hair biobelt power amplifier, as shown in Figure 1, including
Digital pre-distortion block, the base band power amplifier input signal of two frequency ranges generate two numbers after passing through digital pre-distortion block respectively
Word predistortion module output signal, the first digital pre-distortion block output signal and the first local oscillator generate the by the first frequency mixer
Output signal all the way, the second digital pre-distortion block output signal and the second local oscillator generate the output of the second tunnel by the second frequency mixer
Signal, two-way output signal synthesize biobelt signal by two-way synthesizer, and biobelt signal passes through preamplifier and power respectively
After amplifier, a part of power amplifier output signal obtains the first base band power amplifier output signal and the by output feedback module
Two base band power amplifier output signals simultaneously feed back to digital pre-distortion block.Wherein, the first local oscillator is different with the frequency of the second local oscillator.
Present embodiment also discloses the digital pre-distortion method of total hair biobelt power amplifier, including following step
It is rapid:
S1: the base band power amplifier input signal of two frequency ranges is inputted into digital pre-distortion block, digital pre-distortion block respectively
Straight-through, two digital pre-distortion block output signals of generation are the base band power amplifier input signal of two frequency ranges；
S2: by the different local oscillator of two frequency mixers and two frequencies, by the base band power amplifier input signal tune of two frequency ranges
In radio-frequency region needed for making power amplifier, two-way output signal is generated；
S3: the two-way output signal that step S2 is obtained synthesizes biobelt signal, biobelt signal difference by two-way synthesizer
After preamplifier and power amplifier, a part of power amplifier output signal obtains first by output feedback module
Base band power amplifier output signal and the second base band power amplifier output signal simultaneously feed back to digital pre-distortion block；
S4: digital pre-distortion block extracts digital pre-distortion block coefficient；
The digital pre-distortion block coefficient that the base band power amplifier input signal of S5: two frequency ranges is obtained using step S4, passes through
Refresh digital pre-distortion block and obtain two digital pre-distortion block output signals, repeats step S2-S5, iteration 3-4 times.
When carrying out step S4, digital pre-distortion block extracts digital pre-distortion using model formation shown in formula (1) and (2)
Module coefficient:
Wherein, x(1)It (n) is n-th of amount of the base band power amplifier input signal of the first frequency range, x(2)It (n) is the base of the second frequency range
N-th of amount with power amplifier input signal,It is extracted after feeding back to digital pre-distortion block for the first base band power amplifier output signal
Digital pre-distortion coefficientI-th son amount,Digital pre-distortion block is fed back to for the first base band power amplifier output signal
The digital pre-distortion coefficient extracted afterwardsJ-th son amount,It is fed back to for the first base band power amplifier output signal digital pre-
The digital pre-distortion coefficient extracted after distortion moduleS-th son amount,For the first base band power amplifier output signal feedback
The digital pre-distortion coefficient extracted after to digital pre-distortion blockT-th son amount,For the output of the second base band power amplifier
Signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockI-th son amount,For the second base band
Power amplifier output signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockJ-th son amount,For
Second base band power amplifier output signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion blockS-th son
Amount,The digital pre-distortion coefficient extracted after digital pre-distortion block is fed back to for the second base band power amplifier output signal's
T-th of son amount, m are memory depth, and M is the maximum value of memory depth, y(1)It (n) is n-th of the first base band power amplifier output signal
Amount,For i-th of son amount of the n-th-m amounts of the first base band power amplifier output signal, y(2)It (n) is the second base band function
N-th of amount of output signal is put,I-th of son for the n-th-m amounts of the second base band power amplifier output signal is measured, |
y(1)(n-m)|jJ-th of son for the modulus value of the n-th-m amounts of the first base band power amplifier output signal is measured, | y(2)(n-m)|jIt is second
J-th of son amount of the modulus value of the n-th-m amounts of base band power amplifier output signal, psIt (n-m) is s-th of the n-th-m of p (n) amounts
Son amount, qtIt (n-m) is t-th of son amounts of the n-th-m amount of q (n), p (n) and q (n) are respectively as shown in formula (3) and (4), N1It is
The son amount sum of n-th-m amounts of one base band power amplifier output signal, N2For the n-th-m amount of the second base band power amplifier output signal
The son amount sum of modulus value, N3For the son amount sum of the n-th-m amounts of p (n), N4For the son amount sum of the n-th-m amounts of q (n)；
P (n)=| y(1)(n)|+|y(2)(n)| (3)
Q (n)=| y(1)(n)|-|y(2)(n)| (4)。
When the z times progress step S5,1 < z≤iteration total degree, digital pre-distortion block utilizes mould shown in formula (5) and (6)
Type formula calculates digital pre-distortion block output signal:
Wherein,For n-th of amount of the first digital pre-distortion block output signal,It is pre- for the second number
N-th of amount of distortion module output signal,For the n-th-m amounts of the base band power amplifier input signal of the first frequency range
I-th son amount,I-th of son for the n-th-m amounts of the base band power amplifier input signal of the second frequency range is measured, | x(2)(n-m)|jJ-th of son for the modulus value of the base band power amplifier input signal of the second frequency range is measured, | x(1)(n-m)|jFor the first frequency range
J-th of son amount of the modulus value of base band power amplifier input signal, usIt (n-m) is s-th of son amount of the n-th-m of u (n) amounts, vt(n-m)
For t-th of son amount of the n-th-m amounts of v (n), u (n) and v (n) is respectively as shown in formula (7) and (8)；
U (n)=| x(1)(n)|+|x(2)(n)| (7)
V (n)=| x(1)(n)|-|x(2)(n)| (8)。
Shown in functional block diagram such as Fig. 2 (a) of formula (5), first according to base-band input signal x(1)(n) and x(2)(n) carry out plus,
Subtract, modulo operation, obtain u (n), v (n) and | x(2)(n)|；It is directed to x again(1)(n), u (n), v (n) and | x(2)(n) | be segmented,
In addition memory effect, then with the coefficient a that has extracted1、a2、a3、a4It is corresponding to be multiplied；The operation result and x of latter three(1)(n)
After multiplication, with x(1)(n) segmentation result is added, and finally obtains predistortion baseband signalFig. 2 (b) is in (a)
The specific implementation principle of " segmentation+memory " module, in order to guarantee generality, the input signal of this module is indicated with x (n), characteristic
Coefficient is indicated with c；Specifically, when being applied to figure (a), x (n) can use x(1)(n), u (n), v (n) and | x(2)(n) |, c is desirable
a1、a2、a3、a4." segmentation+memory " module realizes that specific step is as follows.Firstly, x (n) passes through N-1 threshold value t1,t2,…,
tN-1It is segmented, obtains N number of component, x1(n),x2(n),…,xN(n).Secondly, resulting N number of component is separately added into depth
For the memory effect of M；That is, x1(n) x is obtained after memory effect being added1(n),x1(n-1),…,x1(n-M), x2(n) add
X is obtained after entering memory effect2(n),x2(n-1),…,x2(n-M), and so on.Again, it is segmented and is obtained after memory effect is added
N (M+1) the height amount arrived and corresponding coefficient cimIt is multiplied, wherein i indicates the component serial number after segmentation, i=1,2 ..., N, m
Indicate memory depth size, m=0,1 ..., M；Finally, final output can be obtained to the important summation of instituteSimilarly, the implementation method of formula (4) can be obtained, details are not described herein again.In addition, model is public
The realization principle of formula (1) (2) can also be described with Fig. 2, and difference is, in model formation (1) (2), coefficient cim(specially a1、a2、
a3、a4And b1、b2、b3、b4) it is amount to be calculated；And final output signal is (specially in model formation (3) (4)With) it is amount to be calculated.
It is the present embodiment signal bandwidth is 20MHz, predistortion is with bandwidth is linearized as shown in Fig. 3 (a) and (b)
The S-band of 160MHz sends out the normalization input-output amplitude characteristic (AM-AM) and phase characteristic (AM- of biobelt power amplifier altogether
PM).Used biobelt signal is a pair of of long term evolution orthogonal frequency division multiplexing 20MHz signal, and centre frequency is respectively in 1.8GHz
And 2.5GHz.It can be seen from the figure that after using digital pre-distortion, in each frequency band, the normalization of power amplifier enter and leave and
Output amplitude relationship is linear, and phase difference is stablized at 0 ° or so, shows good linearisation effect.Segments N1、N2、N3、N4
10 are taken, threshold value takes [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9].
As shown in Fig. 4 (a) and (b), be the present embodiment apply signal bandwidth be 20MHz, predistortion with linearize bandwidth
Send out the normalized power spectral density curve of biobelt power amplifier altogether for the S-band of 160MHz.Used biobelt signal is one
To long term evolution orthogonal frequency division multiplexing 20MHz signal, centre frequency is respectively in 1.8GHz and 2.5GHz.It can be seen from the figure that
After digital pre-distortion technology proposed by the invention, the frequency domain distortion in each frequency band is effectively suppressed, and has reached pre-
The effect of phase.Segments N1、N2、N3、N410 are taken, threshold value takes [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9].
Table 1 is to apply to send out biobelt altogether in the S-band that signal bandwidth is 20MHz, predistortion and linearisation bandwidth are 160MHz
Power amplifier in low working band 1.8GHz first under Adjacent Channel Power Ratio (dBc), Adjacent Channel Power Ratio (dBc) on first,
Normalized mean squared error (dB), standard root-mean-square error (%) performance indicator, and performance when using nil predistortion as pair
Than.Segments N1、N2、N3、N410 are taken, threshold value takes [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9].
Table 1 is to send out biobelt power amplifier performance indicator in low working band 1.8GHz altogether
From table 1 it follows that being about -50.7dBc, normalized mean squared error using the Adjacent Channel Power Ratio of the present embodiment
For -37.6dB or so, standard root-mean-square error is 0.92%, compared with not using digital pre-distortion technology, is separately optimized
19dBc, 15.7dB, 5.60%.
Table 2 is to apply to send out biobelt altogether in the S-band that signal bandwidth is 20MHz, predistortion and linearisation bandwidth are 160MHz
Power amplifier in high working band 2.5GHz first under Adjacent Channel Power Ratio (dBc), Adjacent Channel Power Ratio (dBc) on first,
Normalized mean squared error (dB), standard root-mean-square error (%) performance indicator, and performance when using nil predistortion as pair
Than.Segments N1、N2、N3、N410 are taken, threshold value takes [0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9].
Table 2 is to send out biobelt power amplifier performance indicator in high working band 2.5GHz altogether
From Table 2, it can be seen that using the present invention, Adjacent Channel Power Ratio be about -48.5dBc, normalized mean squared error be -
37dB or so, standard root-mean-square error be 1.12%, compared with not using digital pre-distortion technology, be separately optimized 18dBc,
15dB, 6.7%.
Claims (2)
1. sending out the digital pre-distortion method of biobelt power amplifier altogether, it is characterised in that: the following steps are included:
S1: inputting digital pre-distortion block for the base band power amplifier input signal of two frequency ranges respectively, and digital pre-distortion block is straight-through,
The two digital pre-distortion block output signals generated are the base band power amplifier input signal of two frequency ranges；
S2: by the different local oscillator of two frequency mixers and two frequencies, the base band power amplifier input signal of two frequency ranges is modulated to
In radio-frequency region needed for power amplifier, two-way output signal is generated；
S3: the two-way output signal that step S2 is obtained synthesizes biobelt signal by two-way synthesizer, and biobelt signal passes through respectively
After preamplifier and power amplifier, a part of power amplifier output signal obtains the first base band by output feedback module
Power amplifier output signal and the second base band power amplifier output signal simultaneously feed back to digital pre-distortion block；
S4: digital pre-distortion block extracts digital pre-distortion block coefficient；
When carrying out step S4, digital pre-distortion block extracts digital pre-distortion block using model formation shown in formula (1) and (2)
Coefficient:
Wherein, x(1)It (n) is n-th of amount of the base band power amplifier input signal of the first frequency range, x(2)It (n) is the base band function of the second frequency range
N-th of amount of input signal is put,The number extracted after digital pre-distortion block is fed back to for the first base band power amplifier output signal
Word pre-distortion coefficientsI-th son amount,It is mentioned after feeding back to digital pre-distortion block for the first base band power amplifier output signal
The digital pre-distortion coefficient of taking-upJ-th son amount,Digital pre-distortion is fed back to for the first base band power amplifier output signal
The digital pre-distortion coefficient extracted after moduleS-th son amount,Number is fed back to for the first base band power amplifier output signal
The digital pre-distortion coefficient extracted after word predistortion moduleT-th son amount,For the second base band power amplifier output signal
Feed back to the digital pre-distortion coefficient extracted after digital pre-distortion blockI-th son amount,It is defeated for the second base band power amplifier
Signal feeds back to the digital pre-distortion coefficient extracted after digital pre-distortion block outJ-th son amount,For the second base
The digital pre-distortion coefficient extracted after digital pre-distortion block is fed back to power amplifier output signalS-th son amount,
The digital pre-distortion coefficient extracted after digital pre-distortion block is fed back to for the second base band power amplifier output signalT-th
Son amount, m are memory depth, and M is the maximum value of memory depth, y(1)It (n) is n-th of amount of the first base band power amplifier output signal,For i-th of son amount of the n-th-m amounts of the first base band power amplifier output signal, y(2)(n) defeated for the second base band power amplifier
N-th of amount of signal out,I-th of son for the n-th-m amounts of the second base band power amplifier output signal is measured, | y(1)
(n-m)|jJ-th of son for the modulus value of the n-th-m amounts of the first base band power amplifier output signal is measured, | y(2)(n-m)|jFor the second base
J-th of son amount of the modulus value of the n-th-m with power amplifier output signal amounts, psIt (n-m) is s-th of son of the n-th-m of p (n) amounts
Amount, qtIt (n-m) is t-th of son amounts of the n-th-m amount of q (n), p (n) and q (n) are respectively as shown in formula (3) and (4), N1It is first
The son amount sum of n-th-m amounts of base band power amplifier output signal, N2For the mould of the n-th-m amounts of the second base band power amplifier output signal
The son amount sum of value, N3For the son amount sum of the n-th-m amounts of p (n), N4For the son amount sum of the n-th-m amounts of q (n)；
P (n)=| y(1)(n)|+|y(2)(n)| (3)
Q (n)=| y(1)(n)|-|y(2)(n)| (4)；
The digital pre-distortion block coefficient that the base band power amplifier input signal of S5: two frequency ranges is obtained using step S4, passes through refreshing
Digital pre-distortion block obtains two digital pre-distortion block output signals, repeats step S2-S5, iteration 3-4 times.
2. the digital pre-distortion method according to claim 1 for sending out biobelt power amplifier altogether, it is characterised in that: the z times
When carrying out step S5,1 < z≤iteration total degree, digital pre-distortion block is calculated using model formation shown in formula (5) and (6)
Digital pre-distortion block output signal:
Wherein,For n-th of amount of the first digital pre-distortion block output signal,For the second digital pre-distortion
N-th of amount of module output signal,It is the i-th of the n-th-m amounts of the base band power amplifier input signal of the first frequency range
Height amount,I-th of son for the n-th-m amounts of the base band power amplifier input signal of the second frequency range is measured, | x(2)(n-m)
|jJ-th of son for the modulus value of the base band power amplifier input signal of the second frequency range is measured, | x(1)(n-m)|jFor the base band function of the first frequency range
Put j-th of son amount of the modulus value of input signal, usIt (n-m) is s-th of son amount of the n-th-m of u (n) amounts, vtIt (n-m) is v (n)
The n-th-m amount t-th of son amounts, u (n) and v (n) are respectively as shown in formula (7) and (8)；
U (n)=| x(1)(n)|+|x(2)(n)| (7)
V (n)=| x(1)(n)|-|x(2)(n)| (8)。
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