CN106102156A - Linearisation transmission method based on multiple antennas - Google Patents

Linearisation transmission method based on multiple antennas Download PDF

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Publication number
CN106102156A
CN106102156A CN201610379278.3A CN201610379278A CN106102156A CN 106102156 A CN106102156 A CN 106102156A CN 201610379278 A CN201610379278 A CN 201610379278A CN 106102156 A CN106102156 A CN 106102156A
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signal
constant envelope
antenna
envelope signal
linearisation
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蔡顺燕
庹先国
杨建波
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Chengdu Univeristy of Technology
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Chengdu Univeristy of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

The present invention relates to wireless communication technology in order to solve existing power amplifier linearization technology higher and be not easily accomplished in engineering reality to the branch road coherence request of merit power amplifier, thus the problem affecting the quality of radio communication.The present invention provides a kind of linearisation transmission method based on multiple antennas, comprise the steps: that transmitting terminal carries out signal decomposition to sent Broad-band Modulated Signal, after the Broad-band Modulated Signal of non-constant-envelope is decomposed into multichannel constant envelope signal, each road constant envelope signal is carried out respectively power amplification, and the signal corresponding transmission antenna respectively after amplifying is launched；After receiving terminal receives each road constant envelope signal respectively by multipath reception antenna, each road constant envelope signal carrying out power amplification, and linearly synthesizes amplifying Hou Ge road constant envelope signal, the quantity of described reception antenna is identical with the quantity of transmission antenna.The present invention is applicable to wireless communication system.

Description

Linearisation transmission method based on multiple antennas
Technical field
The present invention relates to wireless communication technology, particularly to a kind of power amplifier linearization decomposed based on multiple antennas and permanent envelope Technology application in wireless communications.
Background technology
Modern wireless communication systems just develops towards two-forty, broadband, intelligentized direction, and band resource becomes more to come The most nervous.In order to accommodate more communication channel in limited spectral range, improve the availability of frequency spectrum, LTE (Long Term Evolution, Long Term Evolution) communication system introduces OFDM (Orthogonal Frequency Division Multiplexing, OFDM) and the key such as MIMO (Multi-Input&Multi-Output, multiple-input and multiple-output) Technology.Wherein MIMO multi-antenna technology makes signal pass through transmitting terminal and multiple antenna transmission of receiving terminal and reception, thus improves Communication quality, it can make full use of space resources, realize MIMO by multiple antennas, is not increasing frequency spectrum resource and antenna In the case of launching power, system channel capacity can be increased exponentially, demonstrate obvious advantage.OFDM then have employed load Ripple quadrature technique, the zero point of each spectrum of carrier zero point and adjacent carrier is overlapping, the most just reduces the interference of intercarrier, with Traditional FDMA compares and further increases band efficiency.The signal that modern wireless communication systems is transmitted have broadband, The features such as high peak-to-average power ratio (dynamic range of signal envelope is bigger), will when this kind of broadband signal is by nonlinear power amplifier Produce serious band and out-of-band distortion, increase the bit error rate of communication system and disturb adjacent channel.Therefore, Modern wireless communication System proposes the highest requirement to the linearity of radio-frequency power amplifier, improves on the premise of keeping greater efficiency as far as possible The linearity of power amplifier has the most great practical significance.Radio-frequency power amplifier linearization technique has become of future generation A key technology in wireless communication system.
Traditional power amplifier linearization method is back-off, i.e. the input power of power amplifier is pressed from 1dB The several dB of point reduction rollback backward, makes power amplifier be operated in the region away from 1dB compression point, thus returns to linear amplification District.But, Power back reduces the utilization ratio of amplifier power supply and causes heat dissipation to increase, this with sacrifice efficiency exchange for The method of the linearity is worthless in a lot of application scenarios, and when back-off to a certain extent time will be unable to improve again merit The linearity of rate amplifier.Therefore, Power back is not suitable for the modern times all having higher requirements the power amplifier linearity and efficiency Wireless communication system.For power amplifier linearization problem, there has been proposed a series of power amplifier linearization and efficiency enhancement techniques, as Feed-forward technique, negative-feedback technology, LINC (Linear Amplification with Nonlinear Components), lose in advance True technology, envelope-tracking (Envelope Tracking, ET) technology, envelope elimination and recovery (Envelope Elimination And Restoration, EER) technology, Doherty technology etc..But, the development of these power amplifier linearization technology still reaches to not Requirement to broadband wireless communications.The wireless communication system of a new generation have employed the OFDM technology of high spectrum utilization and MIMO is many Antenna technology, MIMO discharger needs multiple power amplifiers to drive antenna, and the nonlinear characteristic of each antenna is different, uses During the power amplifier linearization technology of current main-stream (such as predistortion linear technology etc.), it is required for increasing multiple different add-on assemble Or device, when antenna is more, its expense brought is bigger.In order to adapt to the development of next generation mobile communication technology, power amplifier line Property technology is also required to constantly develop and innovate.How to combine the feature of new generation of wireless communication technology, adapt to Novel Communication The needs of technology, the efficiency and the linearity that improve radio-frequency (RF) power amplification further are urgently to be resolved hurrily key issues.
LINC technology is that a kind of efficiency that is provided simultaneously with strengthens and the technology of linearization function, and this technology is first a non-perseverance Determine envelope signal and resolve into the phase-modulated signal of two constant envelope, then with the identical power amplifier of two characteristics to this two-way Signal is amplified respectively, and the two paths of signals after finally utilizing power combiner to amplify synthesizes the signal of linear amplification. LINC technology can use high efficiency nonlinear power amplifier to amplify the two paths of signals of constant envelope, and power amplifier can To be operated in close to saturation.Theoretically, use LINC technology that the efficiency of power amplifier can be made to reach 100%, but due to merit The restriction of rate synthesizer makes the power amplification system whole efficiency of employing LINC technology the highest, the Wilkinson power synthesizer damaged Inefficient, lossless Chireix-Outphasing power combiner efficiency is higher, but its linearity is poor.Additionally, LINC Technology is the most sensitive to amplitude and the unbalance in phase error of two power amplifier branch roads, it requires two power amplifiers Branch road is consistent as far as possible, but these are not easy to accomplish in engineering reality.
Summary of the invention
The invention aims to the branch road concordance solving existing power amplifier linearization technology to merit power amplifier Require higher and engineering reality is not easily accomplished, thus the problem affecting the quality of radio communication.
For reaching above-mentioned purpose, the present invention provides a kind of linearisation transmission method based on multiple antennas, comprises the steps:
Step one, carry out signal decomposition to sent Broad-band Modulated Signal, by the Broad-band Modulated Signal of non-constant-envelope It is decomposed into multichannel constant envelope signal；
Step 2, each road constant envelope signal is carried out respectively power amplification, and the constant envelope signal after amplifying is the most right Ying Yigen transmission antenna is launched；
Step 3, received each road constant envelope signal respectively by multipath reception antenna after, each road constant envelope signal is carried out Power amplification, and linearly synthesize amplifying Hou Ge road constant envelope signal, the quantity of described reception antenna and transmission antenna Quantity identical.
Specifically, the quantity of described constant envelope signal is two-way, and described transmitting antenna and reception antenna are respectively two.
Specifically, to carry out the concrete grammar of signal decomposition as follows for step one:
Described modulated signal is expressed as
X (t)=A (t) ejΦ(t)
Wherein, x (t) represents modulated signal, and A (t) represents the modulation amplitude of signal, and Φ (t) represents the phase modulation of signal,
X (t) is carried out signal decomposition as follows,
x ( t ) = x 1 ( t ) + x 2 ( t ) = r 2 e j ( Φ ( t ) + θ ( t ) ) + r 2 e j ( Φ ( t ) - θ ( t ) ) = r 2 ( e j ( Φ ( t ) + θ ( t ) ) + e j ( Φ ( t ) - θ ( t ) ) )
Wherein, r=max (A (t)), max (A (t)) represent the maximum amplitude value of x (t), and θ (t) represents the signal after decomposing With the phase contrast of x (t), x1(t) and x2T () represents the constant envelope signal after decomposing.
Specifically, using Digital Signal Processing mode to carry out linearly synthesis in step 3, concrete grammar is as follows:
The two paths of signals received is:
The signal of synthesis is:
Wherein, α and β represents reception signal y respectively1(t) and y2The decay factor of (t),AndRepresent respectively and receive signal y1(t) and y2The phase place of (t).
It is preferred that step 3 carry out linearly synthesis time also include to receive two-way constant envelope signal carry out amplitude and Phase compensation, though α=β,The signal of synthesis can be expressed as:
The invention has the beneficial effects as follows:
1) present invention is made without power combing, but a point two-way directly transmits away, uses numeral letter at receiving terminal Number mode processed synthesizes, thus the problem that there is not power combiner efficiency.
2) using two power amplifiers to amplify constant envelope signal in the present invention, the requirement to the power amplifier linearity is substantially reduced, merit Rate amplifier can be operated in close to zone of saturation, and the efficiency of power amplifier is the highest.
3) recover, for two-way in the synthesis carrying out signal at receiving terminal after in the present invention, two paths of signals is transmitted respectively The amplitude of signal, phase problem can be relatively easy to use Digital Signal Processing method completes, and LINC technology be by Two-way radio frequency analog signal synthesizes, and amplitude, the calibration of phase place and regulation are the most relatively difficult, and the shadow that error is to composite signal Ring the biggest.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the linearisation transmission method based on multiple antennas of embodiment；
Fig. 2 is the signal constant-envelope decomposition principle schematic diagram of embodiment.
Detailed description of the invention
Hereinafter technical scheme is described in detail.
The present invention is directed to the existing power amplifier linearization technology branch road coherence request relatively Gao Ergong to merit power amplifier Cheng Shiji is not easily accomplished, thus the problem affecting the quality of radio communication, it is provided that a kind of linearisation based on multiple antennas passes Transmission method, comprises the steps: that transmitting terminal carries out signal decomposition to sent Broad-band Modulated Signal, by the width of non-constant-envelope After band modulated signal is decomposed into multichannel constant envelope signal, each road constant envelope signal is carried out respectively power amplification, and by after amplification A signal corresponding transmission antenna respectively launch；Receiving terminal receives each road perseverance envelope respectively by multipath reception antenna to be believed After number, each road constant envelope signal is carried out power amplification, and linearly synthesizes amplifying Hou Ge road constant envelope signal, described The quantity of reception antenna is identical with the quantity of transmission antenna.
Embodiment
As a example by double antenna is received and dispatched, as it is shown in figure 1, at signal sending end, broadband signal x (t) to be sent needs advanced person Row signal decomposition, is decomposed into two-way constant envelope signal by the Broad-band Modulated Signal of non-constant-envelope, two after signal decomposition Road signal is launched from two antennas after two power amplifiers respectively, owing to the signal after decomposing is permanent envelope letter Number, the requirement to the radio-frequency (RF) power amplification linearity is substantially reduced, and radio-frequency (RF) power amplification can be operated in maximum power point (mpp) (close to saturated shape State), the highest efficiency can be reached.
And at receiving terminal, through the constant envelope signal that two antennas receive, use the process with transmitting terminal contrary, then can close Become to obtain the Broad-band Modulated Signal of transmitting terminal.
Fig. 2 illustrates modulated signal x (t) is decomposed into two-way constant envelope signal x1(t) and x2T (), modulated signal is permissible It is expressed as:
X (t)=A (t) ejΦ(t)
Wherein A (t) represents the modulation amplitude of signal, and Φ (t) represents the phase modulation of signal, and the exradius in figure is letter The maximum amplitude value i.e. max (A (t)) of number x (t), inner circle radius is the half of the maximum amplitude value of x (t).Any one modulates letter Number x (t) (its maximum amplitude value is less than the radius value max (A (t)) of cylindrical), can be by two constant envelope signals x1(t) And x2T () sum represents, the amplitude of two signals chooses constant value max (A (t))/2, and is θ (t) with the phase contrast of x (t), Then modulated signal can be expressed as:
x ( t ) = x 1 ( t ) + x 2 ( t ) = r 2 e j ( Φ ( t ) + θ ( t ) ) + r 2 e j ( Φ ( t ) - θ ( t ) ) = r 2 ( e j ( Φ ( t ) + θ ( t ) ) + e j ( Φ ( t ) - θ ( t ) ) )
Wherein
R=max (A (t))
Two the signal x obtained after decomposition1(t) and x2T () is the modulated signal of the signal of constant amplitude, i.e. constant envelope.
At receiving terminal, owing to the two paths of signals after sending after decomposing, receiving exists in amplitude and phase place compared with original signal Deviation (performance of time difference), the two paths of signals of reception is:
The signal of synthesis is:
The signal of receiving terminal there may be difference in amplitude and phase place, will cause closing if compensated the most accordingly The linear signal become produces distortion.
The two paths of signals received is different due to the path passed through, so the amplitude of signal there may be difference, is carrying out Need during signal syntheses signal amplitude is compensated, on the basis of a wherein road signal amplitude, by Digital Signal Processing Mode adjusts the amplitude of an other road signal, can easier realize adjustment and the compensation of two paths of signals amplitude；And by sending out The mode sending specific training signal can compensate phase error.
Finally, after reception signal is by corresponding amplitude and phase compensation, though α=β,Time, the signal of synthesis Can be expressed as:
I.e. can realize the linear synthesis of signal, wherein, α and β represents reception signal y respectively1(t) and y2The decay of (t) because of Son,AndRepresent respectively and receive signal y1(t) and y2The phase place of (t).
It is above the exemplary description as a example by double antenna is received and dispatched, technical scheme carried out, people in the art Member should be appreciated that according to above embodiment, Broad-band Modulated Signal to be sent is decomposed into multichannel constant envelope signal (two-way with On situation) and carried out the situation sent out Yu receive by multiple antennas, on the premise of need not to pay creative work equally It is achieved.

Claims (5)

1. linearisation transmission method based on multiple antennas, it is characterised in that comprise the steps:
Step one, carry out signal decomposition to sent Broad-band Modulated Signal, the Broad-band Modulated Signal of non-constant-envelope is decomposed For multichannel constant envelope signal；
Step 2, each road constant envelope signal is carried out respectively power amplification, and the constant envelope signal the most corresponding after amplifying Root transmission antenna is launched；
Step 3, received each road constant envelope signal respectively by multipath reception antenna after, each road constant envelope signal is carried out power Amplify, and linearly synthesize amplifying Hou Ge road constant envelope signal, the quantity of described reception antenna and the number of transmission antenna Measure identical.
2. linearisation transmission method based on multiple antennas as claimed in claim 1, it is characterised in that described constant envelope signal Quantity is two-way, and described transmitting antenna and reception antenna are respectively two.
3. linearisation transmission method based on double antenna as claimed in claim 2, it is characterised in that step one carries out signal and divides The concrete grammar solved is as follows:
Described modulated signal is expressed as
X (t)=A (t) ejΦ(t)
Wherein, x (t) represents modulated signal, and A (t) represents the modulation amplitude of signal, and Φ (t) represents the phase modulation of signal,
X (t) is carried out signal decomposition as follows,
x ( t ) = x 1 ( t ) + x 2 ( t ) = r 2 e j ( Φ ( t ) + θ ( t ) ) + r 2 e j ( Φ ( t ) - θ ( t ) ) = r 2 ( e j ( Φ ( t ) + θ ( t ) ) + e j ( Φ ( t ) - θ ( t ) ) )
Wherein, r=max (A (t)), max (A (t)) represent the maximum amplitude value of x (t), and θ (t) represents the signal after decomposing and x The phase contrast of (t), x1(t) and x2T () represents the constant envelope signal after decomposing.
4. linearisation transmission method based on double antenna as claimed in claim 3, it is characterised in that use numeral in step 3 Signal processing mode carries out linearly synthesis, and concrete grammar is as follows:
The two paths of signals received is:
The signal of synthesis is:
Wherein, α and β represents reception signal y respectively1(t) and y2The decay factor of (t),AndRepresent respectively and receive signal y1(t) And y2The phase place of (t).
5. linearisation transmission method based on double antenna as claimed in claim 4, it is characterised in that step 3 carries out holding wire Property synthesis time also include to receive two-way constant envelope signal carry out amplitude and phase compensation, even if α=β,Synthesis Signal can be expressed as
CN201610379278.3A 2016-05-30 2016-05-30 Linearisation transmission method based on multiple antennas Pending CN106102156A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10361895B1 (en) 2018-01-22 2019-07-23 Huawei Technologies Co., Ltd. Systems and methods for hybrid multi-layer signal decomposition
WO2020098472A1 (en) * 2018-11-16 2020-05-22 华为技术有限公司 Sending terminal device and signal processing method

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Publication number Priority date Publication date Assignee Title
CN101383641A (en) * 2007-09-06 2009-03-11 三星电机株式会社 A digital linc transmitter with non-linear element
CN101729079A (en) * 2008-10-13 2010-06-09 电子科技大学 LINC transmitter
CN102484454A (en) * 2009-08-28 2012-05-30 Acco半导体公司 Linearization circuits and methods for power amplification
CN103078820A (en) * 2012-11-21 2013-05-01 交通运输部公路科学研究所 Efficient directional wireless communication method
CN104170250A (en) * 2012-01-16 2014-11-26 努吉拉有限公司 Pre-distortion in rf path in combination with shaping table in envelope path for envelope tracking amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101383641A (en) * 2007-09-06 2009-03-11 三星电机株式会社 A digital linc transmitter with non-linear element
CN101729079A (en) * 2008-10-13 2010-06-09 电子科技大学 LINC transmitter
CN102484454A (en) * 2009-08-28 2012-05-30 Acco半导体公司 Linearization circuits and methods for power amplification
CN104170250A (en) * 2012-01-16 2014-11-26 努吉拉有限公司 Pre-distortion in rf path in combination with shaping table in envelope path for envelope tracking amplifier
CN103078820A (en) * 2012-11-21 2013-05-01 交通运输部公路科学研究所 Efficient directional wireless communication method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10361895B1 (en) 2018-01-22 2019-07-23 Huawei Technologies Co., Ltd. Systems and methods for hybrid multi-layer signal decomposition
WO2019141249A1 (en) * 2018-01-22 2019-07-25 Huawei Technologies Co., Ltd. Systems and methods for hybrid multi-layer signal decomposition
CN111656743A (en) * 2018-01-22 2020-09-11 华为技术有限公司 Hybrid multi-layer signal decomposition system and method
CN111656743B (en) * 2018-01-22 2021-10-22 华为技术有限公司 Hybrid multi-layer signal decomposition method and device
WO2020098472A1 (en) * 2018-11-16 2020-05-22 华为技术有限公司 Sending terminal device and signal processing method
CN111200568A (en) * 2018-11-16 2020-05-26 华为技术有限公司 Transmitting end device and signal processing method
CN111200568B (en) * 2018-11-16 2021-05-18 华为技术有限公司 Transmitting end device and signal processing method
US11239870B2 (en) 2018-11-16 2022-02-01 Huawei Technologies Co., Ltd. Transmitter device and signal processing method

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Application publication date: 20161109