CN108390654A - The configurable multimode digital pre-distortion system and its method of single biobelt mixed transport power amplifier - Google Patents
The configurable multimode digital pre-distortion system and its method of single biobelt mixed transport power amplifier Download PDFInfo
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- CN108390654A CN108390654A CN201810023422.9A CN201810023422A CN108390654A CN 108390654 A CN108390654 A CN 108390654A CN 201810023422 A CN201810023422 A CN 201810023422A CN 108390654 A CN108390654 A CN 108390654A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
Abstract
The invention discloses a kind of configurable multimode digital pre-distortion systems of single biobelt mixed transport power amplifier, including following Three models：First mode：The linearisation of signal under single tape transmission mode；Second mode：It is linearized while sending out two subband signals under biobelt transmission mode altogether；The third mode：The independent linearisation of any one subband signal under biobelt transmission mode is sent out altogether.The present invention can realize the independent linearisation of any subband when linearisation while biobelt transmits two subbands, the altogether transmission of hair biobelt are sent out in single tape transmission with linearisation, altogether, various modes are configurable, the cost of implementation and resource cost for reducing digital pre-distortion technology under single biobelt mixed transport scene, greatly improve the flexibility of system.
Description
Technical field
The present invention relates to the digital linearization technologies of power amplifier, more particularly to a kind of single biobelt mixed transport power
The configurable multimode digital pre-distortion system and its method of amplifier.
Background technology
Fast-developing communication system promotes the base station of multiband, more communication standards further universal, results in total hair mostly band
The generation of transmitter sends out dual band transmission machine as one kind the most commonly used is wherein obtained altogether.On the one hand, in actual scene
In, biobelt transmission is sent out altogether and is not always necessary, for example, the Central Business District in city must when daytime, customer flow was huge
Must be using the frequency spectrum resource for sending out biobelt whole altogether, and night customer flow drops suddenly, only just can meet all demands with single tape transmission.
On the other hand, the following green communications require to further increase the efficiency of existing wireless communications system, while also base station being required to have
The ability of stronger dynamic processing real-time stream.Therefore, single biobelt mixed transport communication system will have broad application prospects,
But also will be to the Primary Component in transmitter --- power amplifier has update also higher requirement.
It is well known that the linear and efficiency of power amplifier can not get both, become that engineers must solve intractable asks
Topic.Under the premise of guaranteed efficiency, digital pre-distortion technology can be with the non-linear of effective compensation power amplifier, past several
Tremendous development has been obtained in 10 years.In single biobelt hybrid transmission system, digital pre-distortion needs to have under following several scenes
To the linearization of nonlinear of power amplifier, 1. under single tape transmission mode signal linearisation, 2. altogether send out biobelt transmission mode under two
It is linearized while a subband signal, 3. sends out the independent linearisation of one of subband signal under biobelt transmission mode altogether.Specifically
For, scene is 3. primarily to reply two subbands noiseproof feature different problems, example caused by modulation system difference
Such as low-frequency band transmission QPSK signals, high frequency band transmits 1024-QAM signals, in fact it could happen that low-frequency band can be demodulated correctly and high frequency band
The case where can not demodulating；At this time in order to reduce the occupancy of hardware resource, it is only necessary to be linearized to high frequency band.However by mesh
Two kinds of single tape, biobelt situations are implemented separately, also cannot achieve total hair biobelt wherein one by preceding all digital pre-distortion systems
The independent linearisation of a subband, it is contemplated that the saving of resource and cost, it is clear that be no longer applicable in；In the case of single biobelt mixed transport
Power amplifier needs completely new digital pre-distortion system.
Invention content
Goal of the invention：The object of the present invention is to provide a kind of configurable multimode numbers of single biobelt mixed transport power amplifier
Word pre-distortion system and its method, may be implemented single tape transmission with linearisation, altogether hair biobelt transmission two subbands while it is linear
Change and send out altogether the independent linearisation of any subband when biobelt transmission.
Technical solution：The configurable multimode digital pre-distortion system of list biobelt mixed transport power amplifier of the present invention
System, including following Three models：
First mode：The linearisation of signal under single tape transmission mode；
Second mode：It is linearized while sending out two subband signals under biobelt transmission mode altogether；
The third mode：The independent linearisation of any one subband signal under biobelt transmission mode is sent out altogether.
Further, in the flrst mode, be divided into only transmission the first frequency band signals and only transmission the second frequency band signals both
Situation：
The initial base band power amplifier input signal of the case where for only transmitting the first frequency band signals, the first frequency range pass through number in advance
The digital pre-distortion block output signal of the first frequency range, the digital pre-distortion block output letter of the first frequency range are generated after distortion module
Number and the first local oscillator by frequency mixer generate output signal, after preamplifier and power amplifier, a part of power is put
Big device output signal obtains the base band power amplifier output signal of the first frequency range by feedback module and feeds back to digital pre-distortion block；
The initial base band power amplifier input signal of the case where for only transmitting the second frequency band signals, the second frequency range pass through number in advance
The digital pre-distortion block output signal of the second frequency range, the digital pre-distortion block output letter of the second frequency range are generated after distortion module
Number and the second local oscillator by frequency mixer generate output signal, after preamplifier and power amplifier, a part of power is put
Big device output signal obtains the base band power amplifier output signal of the second frequency range by feedback module and feeds back to digital pre-distortion block.
Further, under the second mode：The initial base band power amplifier input signal of two frequency ranges passes through digital pre-distortion respectively
Module generates the digital pre-distortion block output signal of two frequency ranges, the digital pre-distortion block output signal of the first frequency range and the
One local oscillator generates first via output signal, the digital pre-distortion block output signal of the second frequency range and second by the first frequency mixer
Local oscillator generates the second tunnel output signal by the second frequency mixer, and two-way output signal synthesizes biobelt signal by two-way synthesizer,
Biobelt signal respectively by preamplifier and power amplifier after, a part of power amplifier output signal is fed back by output
Module 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.
Further, in a third mode, be divided into only linearisation the first frequency band signals and only linearisation the second frequency band signals this
Two kinds of situations：
The initial base band power amplifier input signal of the case where for only linearizing the first frequency band signals, the first frequency range pass through number
The digital pre-distortion block output signal of the first frequency range is generated after predistortion module, then generates two-way output signal, wherein
First via output signal is that the digital pre-distortion block output signal of the first frequency range and the first local oscillator are generated by the first frequency mixer
, the second tunnel output signal is the initial base band power amplifier input signal of the second frequency range directly and the second local oscillator passes through the second frequency mixer
It generates, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal passes through preamplifier and work(respectively
After rate amplifier, the output signal of the first frequency range of a part of power amplifier obtains the base of the first frequency range by output feedback module
Band power amplifier output signal simultaneously feeds back to digital pre-distortion block；
The initial base band power amplifier input signal of the case where for only linearizing the second frequency band signals, the second frequency range pass through number
The digital pre-distortion block output signal of the second frequency range is generated after predistortion module, then generates two-way output signal, wherein
First via output signal is that the initial base band power amplifier input signal of the first frequency range is directly given birth to the first local oscillator by the first frequency mixer
At, the second tunnel output signal is that the digital pre-distortion block output signal of the second frequency range and the second local oscillator pass through the second frequency mixer
It generates, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal passes through preamplifier and work(respectively
After rate amplifier, the output signal of the second frequency range of a part of power amplifier obtains the base of the second frequency range by output feedback module
Band power amplifier output signal simultaneously feeds back to digital pre-distortion block.
Configurable multimode digital pre-distortion system using single biobelt mixed transport power amplifier of the present invention exists
Single tape transmission method under first mode, includes the following steps：
S11：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number
Predistortion module is straight-through, generates the digital pre-distortion block output signal of the first frequency range or the second frequency range, i.e. the first frequency range or the
The base band power amplifier input signal of two frequency ranges；
S12：By frequency mixer and the first local oscillator or the second local oscillator, the base band power amplifier of the first frequency range or the second frequency range is inputted
In radio-frequency region needed for signal modulation to power amplifier, the first via or the second tunnel output signal are generated；
S13：The obtained first via of step S12 or the second tunnel output signal are passed through into preamplifier and power amplifier
Afterwards, a part of power amplifier output signal obtains the first frequency range by output feedback module or the base band power amplifier of the second frequency range is defeated
Go out signal and feeds back to digital pre-distortion block；
S14：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S15：The initial base band power amplifier input signal of first frequency range or the second frequency range is lost using the number that step S14 is obtained is pre-
True module coefficient, the digital pre-distortion block by refreshing the first frequency range or the second frequency range that digital pre-distortion block obtains export
Signal repeats step S12-S15, iteration 3-4 times.
Further, z1When secondary progress step S14,1≤z1≤ iteration total degree, digital pre-distortion block are obtained using formula (1)
Go out the digital pre-distortion block coefficient of the first frequency range or obtains the digital pre-distortion block coefficient of the second frequency range using formula (2)：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band of the second frequency range
N-th of amount of power amplifier input signal, u (n-m)=| xL(n-m) |, xL(n-m) it is the initial base band power amplifier of the first frequency range input letter
Number the n-th-m amount, v (n-m)=| xU(n-m) |, xU(n-m) it is the n-th-m of the initial base band power amplifier input signal of the second frequency range
A amount, m are memory depth, and M is the maximum value of memory depth, y1(n-m) be the first frequency range base band power amplifier output signal the
N-m amount, y2(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the second frequency range,For the base band power amplifier of the first frequency range
Output signal corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block1(n-m) coefficient extracted,
The linear amount y for being m corresponding to memory depth after digital pre-distortion block is fed back to for the base band power amplifier output signal of the second frequency range2
(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,K-th of value of the 1st thresholding is indicated respectively,It is
The base band power amplifier output signal of one frequency range feeds back to after digital pre-distortion block k-th of value for corresponding to the 1st thresholdingExtraction
The digital pre-distortion coefficient gone outK-th of subsystem number,Number is fed back to for the base band power amplifier output signal of the second frequency range
Correspond to k-th of value of the 1st thresholding after predistortion moduleThe digital pre-distortion coefficient extractedK-th of subsystem number；
When carrying out step S15, digital pre-distortion block output signal or the utilization of the first frequency range are obtained using formula (3)
(4) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
Configurable multimode digital pre-distortion system using single biobelt mixed transport power amplifier of the present invention exists
Biobelt transmission method under second mode, includes the following steps：
S21：The initial base band power amplifier input signal of two frequency ranges is inputted into digital pre-distortion block, digital pre-distortion respectively
Module is straight-through, the first frequency range of generation and the digital pre-distortion block output signal of the second frequency range, as the first frequency range and second
The base band power amplifier input signal of frequency range；
S22：The digital pre-distortion block output signal and the first local oscillator of first frequency range generate first by the first frequency mixer
Road output signal, the digital pre-distortion block output signal and the second local oscillator of the second frequency range generate the second tunnel by the second frequency mixer
Output signal；
S23：The two-way output signal that step S22 is obtained synthesizes biobelt signal, biobelt signal point by two-way synthesizer
Not by preamplifier and power amplifier after, a part of power amplifier output signal obtains the by output feedback module
The base band power amplifier output signal of one frequency range and the base band power amplifier output signal of the second frequency range simultaneously feed back to digital pre-distortion block；
S24：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S25：The digital pre-distortion block system that the initial base band power amplifier input signal of two frequency ranges is obtained using step S24
Number obtains the digital pre-distortion block output signal of the first frequency range and the second frequency range by refreshing digital pre-distortion block, repeats
Step S22-S25, iteration 3-4 times.
Further, z2When secondary progress step S24,1≤z2≤ iteration total degree obtains the first frequency using formula (5) and (6)
The digital pre-distortion block coefficient of section and the second frequency range：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band of the second frequency range
N-th of amount of power amplifier input signal, y1(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the first frequency range, y2(n-m) it is
N-th-m amounts of the base band power amplifier output signal of the second frequency range, m are memory depth, and M is the maximum value of memory depth, u (n-m)
=| xL(n-m) |, xL(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the first frequency range, v (n-m)=| xU(n-
M) |, xU(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the second frequency range, p (n-m)=| xL(n-m)|+|xU
(n-m) |, q (n-m)=| xL(n-m)|-|xU(n-m) |, For
The base band power amplifier output signal of first frequency range corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block1
(n-m) coefficient extracted,For the second frequency range base band power amplifier output signal feed back to digital pre-distortion block after correspond to
Memory depth is the linear amount y of m2(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,The 1st is indicated respectively
K-th of value of thresholding,It is fed back to after digital pre-distortion block corresponding to i-th for the base band power amplifier output signal of the first frequency range
K-th of value of a thresholdingThe digital pre-distortion coefficient extractedK-th of subsystem number,For the base band work(of the second frequency range
It puts output signal and feeds back to after digital pre-distortion block k-th of value for corresponding to i-th of thresholdingThe digital pre-distortion extracted
CoefficientK-th of subsystem number, 1≤i≤5,；
When carrying out step S25, the digital pre-distortion block output signal of the first frequency range is obtained using formula (7), and utilize
(8) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
Configurable multimode digital pre-distortion system using single biobelt mixed transport power amplifier of the present invention exists
Biobelt transmission method under the third mode, includes the following steps：
S31：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number
Predistortion module is straight-through, generate the first frequency range or the second frequency range digital pre-distortion block output signal namely the first frequency range or
The base band power amplifier input signal of second frequency range；
S32：Generate two-way output signal, wherein first via output signal is that the digital pre-distortion block of the first frequency range is defeated
Go out signal and initial base band power amplifier input signal that the first local oscillator is generated by the first frequency mixer or the first frequency range directly and
First local oscillator is generated by the first frequency mixer, and the second tunnel output signal is the digital pre-distortion block output signal of the second frequency range
Initial base band power amplifier input signal generated by the second frequency mixer with the second local oscillator or the second frequency range directly and second
It shakes and is generated by the second frequency mixer；
S33：The two-way output signal that step S32 is obtained synthesizes biobelt signal, biobelt signal point by two-way synthesizer
Not by preamplifier and power amplifier after, the output signal of the first frequency range of a part of power amplifier or the second frequency range passes through
Output feedback module is crossed to obtain the base band power amplifier output signal of the first frequency range or the second frequency range and feed back to digital pre-distortion block；
S34：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S35：The initial base band power amplifier input signal of first frequency range or the second frequency range is lost using the number that step S34 is obtained is pre-
True module coefficient, the digital pre-distortion block that the first frequency range or the second frequency range are obtained by refreshing digital pre-distortion block export letter
Number, repeat step S32-S35, iteration 3-4 times.
Further, z3When secondary progress step S34,1≤z3≤ iteration total degree obtains the number of the first frequency range using formula (9)
Word predistortion module coefficient, or utilization formula (10) obtain the digital pre-distortion block coefficient of the second frequency range：
When carrying out step S35, the digital pre-distortion block output signal of the first frequency range is obtained using formula (11), or utilize
(12) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
Advantageous effect：The invention discloses a kind of pre- mistakes of configurable multimode number of single biobelt mixed transport power amplifier
True system and method can realize that linearisation, altogether hair while biobelt transmits two subbands are sent out in single tape transmission with linearisation, altogether
The independent linearisation of biobelt any subband when transmitting, various modes are configurable, reduce digital under single biobelt mixed transport scene
The cost of implementation and resource cost of pre-distortion technology, greatly improve the flexibility of system.
Description of the drawings
Fig. 1 be in the specific embodiment of the invention by selecting different kernel function, pattern 1., 2., 3. between switch
Schematic diagram；
Fig. 2 be in the specific embodiment of the invention single tape transmission mode 1. under, only transmit and linearisation first (or the
Two) system block diagram of frequency range；
Fig. 3 be the specific embodiment of the invention in biobelt transmission mode 2. under system block diagram；
Fig. 4 be the specific embodiment of the invention in biobelt transmission mode 3. under, only linearize the first frequency range or second frequency
The system block diagram of section；
Fig. 4 (a) be biobelt transmission mode 3. under, only linearize the first frequency range system block diagram；
Fig. 4 (b) be biobelt transmission mode 3. under, only linearize the second frequency range system block diagram；
Fig. 5 be applied in the specific embodiment of the invention signal bandwidth be 20MHz, predistortion with linearisation bandwidth be
Normalized power of the centre frequency of the S-band list biobelt mixed transport power amplifier of 160MHz in 2.25GHz and 2.45GHz
Spectrum density curve graph；
Fig. 5 (a) is that 1. pattern is only transmitted and linearisation centre frequency is bent in the normalized power spectral density of 2.25GHz signals
Line chart；
Fig. 5 (b) is that 1. pattern is only transmitted and linearisation centre frequency is bent in the normalized power spectral density of 2.45GHz signals
Line chart；
Fig. 5 (c) is 2. normalized power spectral density curve graph that pattern transmitted and linearized biobelt signal；
Fig. 5 (d) only linearizes centre frequency for pattern when 3. biobelt transmits close in the normalized power spectrum of 2.25GHz signals
It writes music line chart；
Fig. 5 (e) only linearizes centre frequency for pattern when 3. biobelt transmits close in the normalized power spectrum of 2.45GHz signals
It writes music line chart.
Specific implementation mode
Technical scheme of the present invention is further introduced with attached drawing With reference to embodiment.
Present embodiment discloses a kind of pre- mistake of configurable multimode number of single biobelt mixed transport power amplifier
The flexible switching between Three models may be implemented as shown in Figure 1, by selecting different kernel functions in true system：In the first mould
1. formula, i.e. single tape transmission mode select down " the single tape core " of any subband, first band (#1) or second band may be implemented
The linearisation of (#2)；In second mode, i.e., biobelt transmission mode 2. under, select all cores of two bands, can be realized simultaneously the
The linearisation of one frequency band (#1) and second band (#2)；Biobelt transmission mode 3. under, only select first band all cores, only
Realize the linearisation of first band (#1), second band (#2) is without linearisation；The third mode, i.e. biobelt transmission mode 3.
Under, all cores of second band are only selected, realize the linearisation of second band (#2), first band (#1) is without linearisation.
As shown in Fig. 2, pattern 1. under, be divided into only transmission the first frequency band signals and only transmission the second frequency band signals both
Situation：
The initial base band power amplifier input signal of the case where for only transmitting the first frequency band signals, the first frequency range pass through number in advance
The digital pre-distortion block output signal of the first frequency range, the digital pre-distortion block output letter of the first frequency range are generated after distortion module
Number and the first local oscillator by frequency mixer generate output signal, after preamplifier and power amplifier, a part of power is put
Big device output signal obtains the base band power amplifier output signal of the first frequency range by feedback module and feeds back to digital pre-distortion block；
The initial base band power amplifier input signal of the case where for only transmitting the second frequency band signals, the second frequency range pass through number in advance
The digital pre-distortion block output signal of the second frequency range, the digital pre-distortion block output letter of the second frequency range are generated after distortion module
Number and the second local oscillator by frequency mixer generate output signal, after preamplifier and power amplifier, a part of power is put
Big device output signal obtains the base band power amplifier output signal of the second frequency range by feedback module and feeds back to digital pre-distortion block.
Pattern 1. under single tape transmission method include the following steps：
S11：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number
Predistortion module is straight-through, generates the digital pre-distortion block output signal of the first frequency range or the second frequency range, i.e. the first frequency range or the
The base band power amplifier input signal of two frequency ranges；
S12：By frequency mixer and the first local oscillator or the second local oscillator, the base band power amplifier of the first frequency range or the second frequency range is inputted
In radio-frequency region needed for signal modulation to power amplifier, the first via or the second tunnel output signal are generated；
S13：The obtained first via of step S12 or the second tunnel output signal are passed through into preamplifier and power amplifier
Afterwards, a part of power amplifier output signal obtains the first frequency range by output feedback module or the base band power amplifier of the second frequency range is defeated
Go out signal and feeds back to digital pre-distortion block；
S14：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S15：The initial base band power amplifier input signal of first frequency range or the second frequency range is lost using the number that step S14 is obtained is pre-
True module coefficient, the digital pre-distortion block by refreshing the first frequency range or the second frequency range that digital pre-distortion block obtains export
Signal repeats step S12-S15, iteration 3-4 times.
Z1When secondary progress step S14,1≤z1≤ iteration total degree, digital pre-distortion block obtain first using formula (1)
The digital pre-distortion block coefficient of frequency range or the digital pre-distortion block coefficient that the second frequency range is obtained using formula (2)：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band of the second frequency range
N-th of amount of power amplifier input signal, u (n-m)=| xL(n-m) |, xL(n-m) it is the initial base band power amplifier of the first frequency range input letter
Number the n-th-m amount, v (n-m)=| xU(n-m) |, xU(n-m) it is the n-th-m of the initial base band power amplifier input signal of the second frequency range
A amount, m are memory depth, and M is the maximum value of memory depth, y1(n-m) be the first frequency range base band power amplifier output signal the
N-m amount, y2(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the second frequency range,For the base band power amplifier of the first frequency range
Output signal corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block1(n-m) coefficient extracted,
The linear amount y for being m corresponding to memory depth after digital pre-distortion block is fed back to for the base band power amplifier output signal of the second frequency range2
(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,K-th of value of the 1st thresholding is indicated respectively,It is
The base band power amplifier output signal of one frequency range feeds back to after digital pre-distortion block k-th of value for corresponding to the 1st thresholdingExtraction
The digital pre-distortion coefficient gone outK-th of subsystem number,Number is fed back to for the base band power amplifier output signal of the second frequency range
Correspond to k-th of value of the 1st thresholding after predistortion moduleThe digital pre-distortion coefficient extractedK-th of subsystem number；
When carrying out step S15, digital pre-distortion block output signal or the utilization of the first frequency range are obtained using formula (3)
(4) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
As shown in figure 3, pattern 2. under：The initial base band power amplifier input signal of two frequency ranges passes through digital pre-distortion respectively
Module generates the digital pre-distortion block output signal of two frequency ranges, the digital pre-distortion block output signal of the first frequency range and the
One local oscillator generates first via output signal, the digital pre-distortion block output signal of the second frequency range and second by the first frequency mixer
Local oscillator generates the second tunnel output signal by the second frequency mixer, and two-way output signal synthesizes biobelt signal by two-way synthesizer,
Biobelt signal respectively by preamplifier and power amplifier after, a part of power amplifier output signal is fed back by output
Module 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.
Pattern 2. under biobelt transmission method include the following steps：
S21：The initial base band power amplifier input signal of two frequency ranges is inputted into digital pre-distortion block, digital pre-distortion respectively
Module is straight-through, the first frequency range of generation and the digital pre-distortion block output signal of the second frequency range, as the first frequency range and second
The base band power amplifier input signal of frequency range；
S22：The digital pre-distortion block output signal and the first local oscillator of first frequency range generate first by the first frequency mixer
Road output signal, the digital pre-distortion block output signal and the second local oscillator of the second frequency range generate the second tunnel by the second frequency mixer
Output signal；
S23：The two-way output signal that step S22 is obtained synthesizes biobelt signal, biobelt signal point by two-way synthesizer
Not by preamplifier and power amplifier after, a part of power amplifier output signal obtains the by output feedback module
The base band power amplifier output signal of one frequency range and the base band power amplifier output signal of the second frequency range simultaneously feed back to digital pre-distortion block；
S24：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S25：The digital pre-distortion block system that the initial base band power amplifier input signal of two frequency ranges is obtained using step S24
Number obtains the digital pre-distortion block output signal of the first frequency range and the second frequency range by refreshing digital pre-distortion block, repeats
Step S22-S25, iteration 3-4 times.
Z2When secondary progress step S24,1≤z2≤ iteration total degree obtains the first frequency range and second using formula (5) and (6)
The digital pre-distortion block coefficient of frequency range：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band of the second frequency range
N-th of amount of power amplifier input signal, y1(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the first frequency range, y2(n-m) it is
N-th-m amounts of the base band power amplifier output signal of the second frequency range, m are memory depth, and M is the maximum value of memory depth, u (n-m)
=| xL(n-m) |, xL(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the first frequency range, v (n-m)=| xU(n-
M) |, xU(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the second frequency range, p (n-m)=| xL(n-m)|+|xU
(n-m) |, q (n-m)=| xL(n-m)|-|xU(n-m) |, For
The base band power amplifier output signal of first frequency range corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block1
(n-m) coefficient extracted,For the second frequency range base band power amplifier output signal feed back to digital pre-distortion block after correspond to
Memory depth is the linear amount y of m2(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,The 1st is indicated respectively
K-th of value of thresholding,It is fed back to after digital pre-distortion block corresponding to i-th for the base band power amplifier output signal of the first frequency range
K-th of value of a thresholdingThe digital pre-distortion coefficient extractedK-th of subsystem number,For the base band work(of the second frequency range
It puts output signal and feeds back to after digital pre-distortion block k-th of value for corresponding to i-th of thresholdingThe digital pre-distortion extracted
CoefficientK-th of subsystem number, 1≤i≤5；
When carrying out step S25, the digital pre-distortion block output signal of the first frequency range is obtained using formula (7), and utilize
(8) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
In a third mode, it is divided into only the first frequency band signals of linearisation and only both feelings of the second frequency band signals of linearisation
Condition：
As shown in Fig. 4 (a), the case where for only linearizing the first frequency band signals, the initial base band power amplifier of the first frequency range is defeated
Enter signal by generating the digital pre-distortion block output signal of the first frequency range after digital pre-distortion block, then generates two-way
Output signal, wherein first via output signal is that the digital pre-distortion block output signal of the first frequency range and the first local oscillator pass through
First frequency mixer generate, the second tunnel output signal be the second frequency range initial base band power amplifier input signal directly and the second local oscillator
It is generated by the second frequency mixer, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal passes through respectively
After preamplifier and power amplifier, the output signal of the first frequency range of a part of power amplifier is obtained by output feedback module
To the first frequency range base band power amplifier output signal and feed back to digital pre-distortion block；
As shown in Fig. 4 (b), the case where for only linearizing the second frequency band signals, the initial base band power amplifier of the second frequency range is defeated
Enter signal by generating the digital pre-distortion block output signal of the second frequency range after digital pre-distortion block, then generates two-way
Output signal, wherein first via output signal is the initial base band power amplifier input signal of the first frequency range directly and the first local oscillator is logical
The generation of the first frequency mixer is crossed, the second tunnel output signal is the digital pre-distortion block output signal and the second local oscillator of the second frequency range
It is generated by the second frequency mixer, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal passes through respectively
After preamplifier and power amplifier, the output signal of the second frequency range of a part of power amplifier is obtained by output feedback module
To the second frequency range base band power amplifier output signal and feed back to digital pre-distortion block.
Pattern 3. under biobelt transmission method include the following steps：
S31：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number
Predistortion module is straight-through, generate the first frequency range or the second frequency range digital pre-distortion block output signal namely the first frequency range or
The base band power amplifier input signal of second frequency range；
S32：Generate two-way output signal, wherein first via output signal is that the digital pre-distortion block of the first frequency range is defeated
Go out signal and initial base band power amplifier input signal that the first local oscillator is generated by the first frequency mixer or the first frequency range directly and
First local oscillator is generated by the first frequency mixer, and the second tunnel output signal is the digital pre-distortion block output signal of the second frequency range
Initial base band power amplifier input signal generated by the second frequency mixer with the second local oscillator or the second frequency range directly and second
It shakes and is generated by the second frequency mixer；
S33：The two-way output signal that step S32 is obtained synthesizes biobelt signal, biobelt signal point by two-way synthesizer
Not by preamplifier and power amplifier after, the output signal of the first frequency range of a part of power amplifier or the second frequency range passes through
Output feedback module is crossed to obtain the base band power amplifier output signal of the first frequency range or the second frequency range and feed back to digital pre-distortion block；
S34：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S35：The initial base band power amplifier input signal of first frequency range or the second frequency range is lost using the number that step S34 is obtained is pre-
True module coefficient, the digital pre-distortion block that the first frequency range or the second frequency range are obtained by refreshing digital pre-distortion block export letter
Number, repeat step S32-S35, iteration 3-4 times.
Z3When secondary progress step S34,1≤z3≤ iteration total degree show that the number of the first frequency range is pre- using formula (9) and loses
True module coefficient, or utilization formula (10) obtain the digital pre-distortion block coefficient of the second frequency range：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band of the second frequency range
N-th of amount of power amplifier input signal, y1(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the first frequency range, y2(n-m) it is
N-th-m amounts of the base band power amplifier output signal of the second frequency range, m are memory depth, and M is the maximum value of memory depth, u (n-m)
=| xL(n-m) |, xL(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the first frequency range, v (n-m)=| xU(n-
M) |, xU(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the second frequency range, p (n-m)=| xL(n-m)|+|xU
(n-m) |, q (n-m)=| xL(n-m)|-|xU(n-m) |, For
The base band power amplifier output signal of first frequency range corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block1
(n-m) coefficient extracted,For the second frequency range base band power amplifier output signal feed back to digital pre-distortion block after correspond to
Memory depth is the linear amount y of m2(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,The 1st is indicated respectively
K-th of value of thresholding,It is fed back to after digital pre-distortion block corresponding to i-th for the base band power amplifier output signal of the first frequency range
K-th of value of a thresholdingThe digital pre-distortion coefficient extractedK-th of subsystem number,For the base band work(of the second frequency range
It puts output signal and feeds back to after digital pre-distortion block k-th of value for corresponding to i-th of thresholdingThe digital pre-distortion extracted
CoefficientK-th of subsystem number, 1≤i≤5；
When carrying out step S35, the digital pre-distortion block output signal of the first frequency range is obtained using formula (11), or utilize
(12) the digital pre-distortion block output signal of the second frequency range is obtained：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the number of the second frequency range
Word predistortion module output signal.
As shown in Fig. 5 (a), be present embodiment apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth
For 160MHz S-band list biobelt mixed transport power amplifier pattern 1. under normalized power spectral density curve.It is adopted
Single tape signal is long term evolution orthogonal frequency division multiplexing 20MHz signals, and centre frequency is in 2.25GHz.It can be seen from the figure that
After digital pre-distortion technology proposed by the invention, the frequency domain distortion in first band is effectively suppressed, and has reached pre-
The effect of phase.Threshold value takes β=[0.2 0.4 0.6 0.8], threshold number K=4, memory depth M=3, coefficient number 20.
As shown in Fig. 5 (b), be present embodiment apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth
For 160MHz S-band list biobelt mixed transport power amplifier pattern 1. under normalized power spectral density curve.It is adopted
Single tape signal is long term evolution orthogonal frequency division multiplexing 20MHz signals, and centre frequency is in 2.45GHz.It can be seen from the figure that
After digital pre-distortion technology proposed by the invention, the frequency domain distortion in second band is effectively suppressed, and has reached pre-
The effect of phase.Threshold value takes β=[0.2 0.4 0.6 0.8], threshold number K=4, memory depth M=3, coefficient number 20.
As shown in Fig. 5 (c), be present embodiment apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth
For 160MHz S-band list biobelt mixed transport power amplifier pattern 2. under normalized power spectral density curve.It is adopted
Biobelt signal is a pair of of long term evolution orthogonal frequency division multiplexing 20MHz signals, centre frequency respectively in 2.25GHz and
2.45GHz.It can be seen from the figure that after using digital pre-distortion technology proposed by the invention, the frequency domain in each frequency band loses
It is really effectively suppressed, produces a desired effect.Threshold value takes β=[0.2 0.4 0.6 0.8], threshold number K=4, memory
Depth M=3, coefficient number 168.
As shown in Fig. 5 (d), be present embodiment apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth
For 160MHz S-band list biobelt mixed transport power amplifier pattern 3. under normalized power spectral density curve.It is adopted
Biobelt signal is a pair of of long term evolution orthogonal frequency division multiplexing 20MHz signals, centre frequency respectively in 2.25GHz and
2.45GHz.It can be seen from the figure that after using digital pre-distortion technology proposed by the invention, the frequency domain in first band loses
It is really effectively suppressed, second band distortion remains unchanged, and produces a desired effect.Threshold value takes β=[0.2 0.4 0.6
0.8], threshold number K=4, memory depth M=3, coefficient number 84.
As shown in Fig. 5 (e), be present embodiment apply signal bandwidth be 20MHz, predistortion with linearisation bandwidth
For 160MHz S-band list biobelt mixed transport power amplifier pattern 3. under normalized power spectral density curve.It is adopted
Biobelt signal is a pair of of long term evolution orthogonal frequency division multiplexing 20MHz signals, centre frequency respectively in 2.25GHz and
2.45GHz.It can be seen from the figure that after using digital pre-distortion technology proposed by the invention, the frequency domain in second band loses
It is really effectively suppressed, first band distortion remains unchanged, and produces a desired effect.Threshold value takes β=[0.2 0.4 0.6
0.8], threshold number K=4, memory depth M=3, coefficient number 84.
Table 1 is to apply to mix in the S-band list biobelt that signal bandwidth is 20MHz, predistortion is 160MHz with linearisation bandwidth
Close transmission power amplifier pattern 1. under, first neighboring trace work(of the transmission center frequency in 2.25GHz and 2.45GHz respectively
Rate ratio (dBc), standard root-mean-square error (%) performance indicator, and performance when with nil predistortion is as a comparison.Threshold value
Take β=[0.2 0.4 0.6 0.8], threshold number K=4, memory depth M=3, coefficient number 20.
Table 1 be single biobelt mixed transport power amplifier mode 1. under performance indicator
From table 1 it follows that be about -54.1dBc using the first band Adjacent Channel Power Ratio of present embodiment,
Standard root-mean-square error is 0.82%, and compared with not using digital pre-distortion technology, 19.1dBc, 6.2% has been separately optimized；It adopts
It is about -54.8dBc with the second band Adjacent Channel Power Ratio of present embodiment, standard root-mean-square error is 0.78%, with
It does not use digital pre-distortion technology to compare, 23.1dBc, 14.9% has been separately optimized；
Table 2 is to apply to mix in the S-band list biobelt that signal bandwidth is 20MHz, predistortion is 160MHz with linearisation bandwidth
Close transmission power amplifier pattern 2. under, simultaneous transmission simultaneously linearizes first of centre frequency in 2.25GHz and 2.45GHz
Adjacent Channel Power Ratio (dBc), standard root-mean-square error (%) performance indicator, and performance when with nil predistortion is as a comparison.
Threshold value takes β=[0.2 0.4 0.6 0.8], threshold number K=4, memory depth M=3, coefficient number 168.
Table 2 be single biobelt mixed transport power amplifier mode 2. under performance indicator
From Table 2, it can be seen that using present embodiment Adjacent Channel Power Ratio be about -44.5dBc and -
47.5dBc, standard root-mean-square error are 1.80% and 1.36%, compared with not using digital pre-distortion technology, are separately optimized
13.4dBc, 8.1% and 17.9dBc, 9.6%.
Table 3 is to apply to mix in the S-band list biobelt that signal bandwidth is 20MHz, predistortion is 160MHz with linearisation bandwidth
Close transmission power amplifier pattern 3. under, transmission biobelt signal, respectively only linearisation centre frequency in 2.25GHz and
The first Adjacent Channel Power Ratio (dBc), standard root-mean-square error (%) performance indicator when 2.45GHz, and when with nil predistortion
Performance as a comparison.Threshold value takes β=[0.2 0.4 0.6 0.8], threshold number K=4, memory depth M=3, coefficient number
It is 84.
Table 3 be single biobelt mixed transport power amplifier mode 3. under performance indicator
From table 3 it is observed that using present embodiment Adjacent Channel Power Ratio be about -46.5dBc and -
47.5dBc, standard root-mean-square error are 1.80% and 1.36%, compared with not using digital pre-distortion technology, are separately optimized
15.4dBc, 7.4% and 17.4dBc, 8.3%.
Table 4 is present embodiment being compared with the resource cost that coefficient number is reference under above-mentioned Three models,
It can be seen that the present invention not only realizes the flexible switching of various modes, the reduction of resource occupation under associative mode is also achieved.
Table 4 is the coefficient number under single biobelt mixed transport 3 kinds of patterns of power amplifier
| Pattern | ① | ② | ③ |
| Coefficient number | 20 | 168 | 84 |
Claims (10)
1. the configurable multimode digital pre-distortion system of single biobelt mixed transport power amplifier, it is characterised in that：Including following
Three models：
First mode：The linearisation of signal under single tape transmission mode；
Second mode：It is linearized while sending out two subband signals under biobelt transmission mode altogether；
The third mode：The independent linearisation of any one subband signal under biobelt transmission mode is sent out altogether.
2. the configurable multimode digital pre-distortion system of list biobelt mixed transport power amplifier according to claim 1,
It is characterized in that：In the flrst mode, it is divided into only the first frequency band signals of transmission and only the second frequency band signals both of these case of transmission：
The initial base band power amplifier input signal of the case where for only transmitting the first frequency band signals, the first frequency range pass through digital pre-distortion
Generate the digital pre-distortion block output signal of the first frequency range after module, the digital pre-distortion block output signal of the first frequency range and
First local oscillator generates output signal, after preamplifier and power amplifier, a part of power amplifier by frequency mixer
Output signal obtains the base band power amplifier output signal of the first frequency range by feedback module and feeds back to digital pre-distortion block；
The initial base band power amplifier input signal of the case where for only transmitting the second frequency band signals, the second frequency range pass through digital pre-distortion
Generate the digital pre-distortion block output signal of the second frequency range after module, the digital pre-distortion block output signal of the second frequency range and
Second local oscillator generates output signal, after preamplifier and power amplifier, a part of power amplifier by frequency mixer
Output signal obtains the base band power amplifier output signal of the second frequency range by feedback module and feeds back to digital pre-distortion block.
3. the configurable multimode digital pre-distortion system of list biobelt mixed transport power amplifier according to claim 1,
It is characterized in that：Under the second mode：The initial base band power amplifier input signal of two frequency ranges passes through digital pre-distortion block respectively
Generate the digital pre-distortion block output signal of two frequency ranges, the digital pre-distortion block output signal and first of the first frequency range
It shakes and first via output signal, the digital pre-distortion block output signal and the second local oscillator of the second frequency range is generated by the first frequency mixer
The second tunnel output signal is generated by the second frequency mixer, two-way output signal synthesizes biobelt signal, biobelt by two-way synthesizer
Signal respectively by preamplifier and power amplifier after, a part of power amplifier output signal is by output feedback module
It 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.
4. the configurable multimode digital pre-distortion system of list biobelt mixed transport power amplifier according to claim 1,
It is characterized in that：In a third mode, be divided into only linearisation the first frequency band signals and only linearisation the second frequency band signals both
Situation：
The initial base band power amplifier input signal of the case where for only linearizing the first frequency band signals, the first frequency range pass through digital pre- mistake
The digital pre-distortion block output signal that the first frequency range is generated after true module, then generates two-way output signal, wherein first
Road output signal is the digital pre-distortion block output signal of the first frequency range and the first local oscillator is generated by the first frequency mixer, the
Two tunnel output signals are that the initial base band power amplifier input signal of the second frequency range is directly generated with the second local oscillator by the second frequency mixer
, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal is put by preamplifier and power respectively
After big device, the output signal of the first frequency range of a part of power amplifier obtains the base band work(of the first frequency range by output feedback module
It puts output signal and feeds back to digital pre-distortion block；
The initial base band power amplifier input signal of the case where for only linearizing the second frequency band signals, the second frequency range pass through digital pre- mistake
The digital pre-distortion block output signal that the second frequency range is generated after true module, then generates two-way output signal, wherein first
Road output signal is that the initial base band power amplifier input signal of the first frequency range is directly generated with the first local oscillator by the first frequency mixer,
Second tunnel output signal is that the digital pre-distortion block output signal of the second frequency range and the second local oscillator are generated by the second frequency mixer
, two-way output signal synthesizes biobelt signal by two-way synthesizer, and biobelt signal is put by preamplifier and power respectively
After big device, the output signal of the second frequency range of a part of power amplifier obtains the base band work(of the second frequency range by output feedback module
It puts output signal and feeds back to digital pre-distortion block.
5. using the configurable multimode digital pre-distortion system of single biobelt mixed transport power amplifier according to claim 1
The single tape transmission method of system in the flrst mode, it is characterised in that：Include the following steps：
S11：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number is pre- to be lost
True module is straight-through, generates the digital pre-distortion block output signal of the first frequency range or the second frequency range, i.e. the first frequency range or the second frequency
The base band power amplifier input signal of section；
S12：By frequency mixer and the first local oscillator or the second local oscillator, by the first frequency range or the base band power amplifier input signal of the second frequency range
It is modulated in the radio-frequency region needed for power amplifier, generates the first via or the second tunnel output signal；
S13：By the obtained first via of step S12 or the second tunnel output signal by preamplifier and power amplifier after, one
Partial Power amplifier output signal obtains the base band power amplifier output letter of the first frequency range or the second frequency range by output feedback module
Number and feed back to digital pre-distortion block；
S14：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S15：The digital pre-distortion mould that the initial base band power amplifier input signal of first frequency range or the second frequency range is obtained using step S14
Block coefficient, the digital pre-distortion block by refreshing the first frequency range or the second frequency range that digital pre-distortion block obtains export letter
Number, repeat step S12-S15, iteration 3-4 times.
6. single tape transmission method according to claim 5, it is characterised in that：Z1When secondary progress step S14,1≤z1≤ repeatedly
For total degree, digital pre-distortion block obtains the digital pre-distortion block coefficient of the first frequency range using formula (1) or utilizes formula (2)
Obtain the digital pre-distortion block coefficient of the second frequency range：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band power amplifier of the second frequency range
N-th of amount of input signal, u (n-m)=| xL(n-m) |, xL(n-m) it is the initial base band power amplifier input signal of the first frequency range
N-th-m amounts, v (n-m)=| xU(n-m) |, xU(n-m) it is the n-th-m of the initial base band power amplifier input signal of the second frequency range
Amount, m are memory depth, and M is the maximum value of memory depth, y1(n-m) it is the n-th-m of the base band power amplifier output signal of the first frequency range
A amount, y2(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the second frequency range,It is defeated for the base band power amplifier of the first frequency range
Go out after signal feeds back to digital pre-distortion block and corresponds to the linear amount y that memory depth is m1(n-m) coefficient extracted,For
The base band power amplifier output signal of second frequency range corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block2
(n-m) coefficient extracted, k are thresholding serial number, and K is threshold number,K-th of value of the 1st thresholding is indicated respectively,It is
The base band power amplifier output signal of one frequency range feeds back to after digital pre-distortion block k-th of value for corresponding to the 1st thresholdingExtraction
The digital pre-distortion coefficient gone outK-th of subsystem number,Number is fed back to for the base band power amplifier output signal of the second frequency range
Correspond to k-th of value of the 1st thresholding after predistortion moduleThe digital pre-distortion coefficient extractedK-th of subsystem number；
When carrying out step S15, obtains the digital pre-distortion block output signal of the first frequency range using formula (3) or (4) is utilized to obtain
Go out the digital pre-distortion block output signal of the second frequency range：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the digital pre- of the second frequency range
Distortion module output signal.
7. using the configurable multimode digital pre-distortion system of single biobelt mixed transport power amplifier according to claim 1
The biobelt transmission method of system under the second mode, it is characterised in that：Include the following steps：
S21：The initial base band power amplifier input signal of two frequency ranges is inputted into digital pre-distortion block, digital pre-distortion block respectively
It leads directly to, the first frequency range of generation and the digital pre-distortion block output signal of the second frequency range, as the first frequency range and the second frequency range
Base band power amplifier input signal；
S22：The digital pre-distortion block output signal and the first local oscillator of first frequency range are defeated by the first frequency mixer generation first via
Go out signal, the digital pre-distortion block output signal and the second local oscillator of the second frequency range generate the output of the second tunnel by the second frequency mixer
Signal；
S23：The two-way output signal that step S22 is obtained synthesizes biobelt signal by two-way synthesizer, and biobelt signal leads to respectively
After crossing preamplifier and power amplifier, a part of power amplifier output signal obtains the first frequency by output feedback module
The base band power amplifier output signal of section and the base band power amplifier output signal of the second frequency range simultaneously feed back to digital pre-distortion block；
S24：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S25：The digital pre-distortion block coefficient that the initial base band power amplifier input signal of two frequency ranges is obtained using step S24 leads to
It crosses refreshing digital pre-distortion block and obtains the digital pre-distortion block output signal of the first frequency range and the second frequency range, repeat step
S22-S25, iteration 3-4 times.
8. biobelt transmission method according to claim 7, it is characterised in that：Z2When secondary progress step S24,1≤z2≤ repeatedly
For total degree, the digital pre-distortion block coefficient of the first frequency range and the second frequency range is obtained using formula (5) and (6)：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band power amplifier of the second frequency range
N-th of amount of input signal, y1(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the first frequency range, y2(n-m) it is second
N-th-m of the base band power amplifier output signal of frequency range amounts, m are memory depth, and M is the maximum value of memory depth, u (n-m)=| xL
(n-m) |, xL(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the first frequency range, v (n-m)=| xU(n-m) |, xU
(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the second frequency range, p (n-m)=| xL(n-m)|+|xU(n-m) |, q
(n-m)=| xL(n-m)|-|xU(n-m) |,
It is fed back for the base band power amplifier output signal of the first frequency range
Correspond to the linear amount y that memory depth is m after to digital pre-distortion block1(n-m) coefficient extracted,For the second frequency range
Base band power amplifier output signal corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block2(n-m) it extracts
Coefficient, k be thresholding serial number, K is threshold number,K-th of value of the 1st thresholding is indicated respectively,For the base of the first frequency range
K-th value corresponding to i-th thresholding is fed back to power amplifier output signal after digital pre-distortion blockThe number extracted is pre-
Distortion factorK-th of subsystem number,Digital pre-distortion block is fed back to for the base band power amplifier output signal of the second frequency range
Correspond to k-th of value of i-th of thresholding afterwardsThe digital pre-distortion coefficient extractedK-th of subsystem number, 1≤i≤5；
When carrying out step S25, the digital pre-distortion block output signal of the first frequency range is obtained using formula (7), and (8) is utilized to obtain
Go out the digital pre-distortion block output signal of the second frequency range：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the digital pre- of the second frequency range
Distortion module output signal.
9. using the configurable multimode digital pre-distortion system of single biobelt mixed transport power amplifier according to claim 1
The biobelt transmission method of system in a third mode, it is characterised in that：Include the following steps：
S31：The initial base band power amplifier input signal of first frequency range or the second frequency range is inputted into digital pre-distortion block, number is pre- to be lost
True module is straight-through, generates the digital pre-distortion block output signal namely the first frequency range or second of the first frequency range or the second frequency range
The base band power amplifier input signal of frequency range；
S32：Generate two-way output signal, wherein first via output signal is the digital pre-distortion block output letter of the first frequency range
Number and the first local oscillator generated by the first frequency mixer or the first frequency range initial base band power amplifier input signal directly and first
Local oscillator is generated by the first frequency mixer, and the second tunnel output signal is the digital pre-distortion block output signal and the of the second frequency range
Initial base band power amplifier input signal that two local oscillators are generated by the second frequency mixer or the second frequency range is directly and the second local oscillator is logical
Cross the generation of the second frequency mixer；
S33：The two-way output signal that step S32 is obtained synthesizes biobelt signal by two-way synthesizer, and biobelt signal leads to respectively
After crossing preamplifier and power amplifier, the output signal of the first frequency range of a part of power amplifier or the second frequency range is by defeated
Go out feedback module to obtain the base band power amplifier output signal of the first frequency range or the second frequency range and feed back to digital pre-distortion block；
S34：Digital pre-distortion block extracts digital pre-distortion block coefficient；
S35：The digital pre-distortion mould that the initial base band power amplifier input signal of first frequency range or the second frequency range is obtained using step S34
Block coefficient obtains the digital pre-distortion block output signal of the first frequency range or the second frequency range by refreshing digital pre-distortion block,
Repeat step S32-S35, iteration 3-4 times.
10. biobelt transmission method according to claim 9, it is characterised in that：Z3When secondary progress step S34,1≤z3≤
Iteration total degree is obtained the digital pre-distortion block coefficient of the first frequency range using formula (9), or obtains the second frequency range using formula (10)
Digital pre-distortion block coefficient：
Wherein, x1(n) it is n-th of amount of the base band power amplifier input signal of the first frequency range, x2(n) it is the base band power amplifier of the second frequency range
N-th of amount of input signal, y1(n-m) it is the n-th-m amounts of the base band power amplifier output signal of the first frequency range, y2(n-m) it is second
N-th-m of the base band power amplifier output signal of frequency range amounts, m are memory depth, and M is the maximum value of memory depth, u (n-m)=| xL
(n-m) |, xL(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the first frequency range, v (n-m)=| xU(n-m) |, xU
(n-m) it is the n-th-m amounts of the initial base band power amplifier input signal of the second frequency range, p (n-m)=| xL(n-m)|+|xU(n-m) |, q
(n-m)=| xL(n-m)|-|xU(n-m) |,
It is fed back for the base band power amplifier output signal of the first frequency range
Correspond to the linear amount y that memory depth is m after to digital pre-distortion block1(n-m) coefficient extracted,For the second frequency range
Base band power amplifier output signal corresponds to the linear amount y that memory depth is m after feeding back to digital pre-distortion block2(n-m) it extracts
Coefficient, k be thresholding serial number, K is threshold number,K-th of value of the 1st thresholding is indicated respectively,For the base of the first frequency range
K-th value corresponding to i-th thresholding is fed back to power amplifier output signal after digital pre-distortion blockThe number extracted is pre-
Distortion factorK-th of subsystem number,Digital pre-distortion block is fed back to for the base band power amplifier output signal of the second frequency range
Correspond to k-th of value of i-th of thresholding afterwardsThe digital pre-distortion coefficient extractedK-th of subsystem number, 1≤i≤5；
When carrying out step S35, the digital pre-distortion block output signal of the first frequency range is obtained using formula (11), or utilize (12)
Obtain the digital pre-distortion block output signal of the second frequency range：
Wherein, xpre1(n) it is the digital pre-distortion block output signal of the first frequency range, xpre2(n) it is the digital pre- of the second frequency range
Distortion module output signal.
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