CN101626355B - Calibration device and calibration method of multi-input multi-output (MIMO) terminal - Google Patents

Calibration device and calibration method of multi-input multi-output (MIMO) terminal Download PDF

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CN101626355B
CN101626355B CN 200910090874 CN200910090874A CN101626355B CN 101626355 B CN101626355 B CN 101626355B CN 200910090874 CN200910090874 CN 200910090874 CN 200910090874 A CN200910090874 A CN 200910090874A CN 101626355 B CN101626355 B CN 101626355B
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distortion
pre
module
power
calibration
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CN 200910090874
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CN101626355A (en
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李济水
王年涛
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北京天碁科技有限公司
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Abstract

The invention provides a calibration device and a calibration method of a multi-input multi-output (MIMO) terminal. The calibration device comprises a second antenna port, a feedback module, a radio frequency receiving module, a comparison module, a distortion degree determination module and a predistortion treatment module, wherein the feedback module is used for feeding back an output signal ofa radio frequency emission module to the second antenna port; the radio frequency receiving module is used for obtaining a digitized feedback signal; the comparison module is used for comparing the feedback signal with an input signal and determining whether a power amplifier works in a nonlinear area or not according to a comparison result; the distortion degree determination module is used for determining the distortion degree of the feedback signal when the power amplifier works in the nonlinear area; and the predistortion treatment module is used for adjusting a predistortion coefficient according to the distortion degree when the power amplifier works in the nonlinear area so as to obtain a calibrated predistortion coefficient. The calibration device can be utilized to calibrate a predistortion coefficient lookup table so as to ensure that the MIMO terminal can carry out predistortion treatment by utilizing the calibrated predistortion coefficient lookup table in a working process so as to improve the linear performance of the power amplifier.

Description

ー种多输入多输出终端的校准装置及校准方法 Species ー calibration device and calibration method of multiple input multiple output terminals

技术领域 FIELD

[0001] 本发明涉及移动通信领域,特别是涉及ー种多输入多输出(Multiple-InputMultiple-Output, MI MO)终端的校准装置及校准方法。 [0001] The present invention relates to the field of mobile communications, particularly to a kind of multiple input multiple output ー (Multiple-InputMultiple-Output, MI MO) calibration device and calibration method of a terminal.

背景技术 Background technique

[0002] 在移动通信领域,3GPP长期演进LTE技术因其代表着3G后续演进的方向,而受到广泛的关注。 [0002] In the mobile communication field, 3GPP long term evolution LTE technology represents the direction of its subsequent evolution of 3G, and widespread concern. LTE对可变信道带宽的支持要求功放在更宽的频带上实现高线性化,OFDM技术在LTE中的应用也会大大提高整个系统的峰均比,这些都对放大器的线性度提出了更高的要求。 LTE support variable channel bandwidth requirements to achieve high linear amplifier over a wider frequency band, the application of OFDM in LTE will greatly improve the PAPR of the entire system, which are on the linearity of the amplifier in a higher requirements. 此外,LTE中用到的64QAM等调制方式也都对系统的线性度有较高的要求。 Further, 64QAM modulation scheme, etc. are also used in LTE have high requirements on the linearity of the system. 从以上分析,我们可以发现在LTE系统的设计上尽可能地提高系统的线性度是非常有意义的。 From the above analysis, we can find in the design of the LTE system as much as possible to improve the linearity of the system is very meaningful. [0003] 现有技术中,实现射频功放线性化的方法很多,常见的有以下三种:功率回退法、如馈法和预失真法。 [0003] In the prior art, implementation of the RF power amplifier linearization many common are the following three: a power back-off methods, such as predistortion and feed-forward method.

[0004] 功率回退法引入了ー对矛盾体即效率和线性度,必须在两者之间找到一个合适的平衡点,它相当于把功率较大的管子作小功率管使用,牺牲功放的效率来提高线性度,功率放大器的效率大为降低,另外它有一定的局限性,当功率回退到一定程度,继续回退将不再改善放大器的线性度。 [0004] The power backoff law introduced ー i.e. efficiency and linearity, must be found in the paradox of a proper balance between the two points, it is equivalent to a higher power tubes used for low power tube, sacrificial amplifier to improve the efficiency of linearity, power amplifier efficiency greatly reduced, while it has some limitations, when the power falls back to a certain extent, continue rollback will not improve amplifier linearity.

[0005] 前馈法用于输出校准吋,由于输出信号的功率电平较大,这样就必须引入ー个线性度更好的功放来对校准信号进行放大,否则校准就没有意义了,此外还需获得精确的幅度、相位和时延匹配,否则就不能完全抵消,引入误差。 [0005] The method for outputting a feedforward calibration inch, since the power level of the output signal is large, so we must introduce ー a more linear power amplifier to amplify the signal calibration, or calibration does not make sense, in addition to required to obtain accurate amplitude, phase and delay matching, otherwise it can not be completely canceled, error is introduced.

[0006] 预失真法的本质就是在功率放大器前增加ー个非线性电路以补偿功率放大器的非线性,基带预失真由于工作频率低,可以用数字电路实现,是当前研究的ー个热点。 [0006] Essence predistortion amplifier is increased before ー nonlinear power amplifier nonlinear compensation circuit, a baseband pre-distortion due to the low operating frequency, can be implemented in digital electronic circuitry, is a focus of current research ー. 数字预失真器由一个矢量增益调节器组成,它可以根据查找表(LUT,Look-Up-Table)的内容来控制输入信号的幅度和相位,并进而控制预失真的大小,从而提供一个与功放相反的非线性特性,以使得输入信号与功放输出信号的差别最小。 Digital predistorter consists of a vector gain regulator composition, it is possible to control the amplitude and phase of the input signal according to contents of a lookup table (LUT, Look-Up-Table), and thus control the predistortion size, thereby providing a the amplifier Nonlinear characteristics opposite, so that the difference between the input signal and the amplifier output signal is minimized. 数字预失真器不存在稳定性问题、有更宽的信号频带、能够处理含多载波的信号。 Digital predistorter does not have problems with stability, a wider frequency band signals, capable of processing signals comprising multiple carriers. 但是,本发明人在实现本发明的过程中发现,预失真技术很难应用于早期的移动终端,其中的ー个重要原因是在早期的移动终端中应用预失真技术需要加ー个额外的接收机,这增加了终端的成本。 However, in the process of implementing the present invention it found the present invention, a predistortion technique is difficult to apply early mobile terminal, which is the important reason ー predistortion technique applied in the early mobile terminals need to add additional receiving ーmachine, which increases the cost of the terminal.

发明内容 SUMMARY

[0007] 本发明的目的是提供一种多输入多输出终端的校准装置及校准方法,以解决在移动终端中利用预失真技术来提高系统的线性性能的技术问题。 [0007] The object of the present invention is to provide a calibration device and a multi-input multi-output terminal of the calibration method, in order to solve the technology to increase the use of pre-distortion technologies in a mobile terminal system of linear properties.

[0008] 为了实现上述目的,本发明提供了一种多输入多输出终端的校准装置,所述多输入多输出MIMO終端包括:第一天线ロ,及与所述第一天线ロ相连接的射频发射模块,所述射频发射模块包括功率放大器,其中,所述MMO终端还包括: [0008] To achieve the above object, the present invention provides an apparatus for calibrating a multiple input multiple output terminals, the multiple input multiple output MIMO terminal comprising: a first antenna ro, and is connected to the first RF antenna ro transmitting module, a RF transmitting module includes a power amplifier, wherein the MMO terminal further comprises:

[0009] 预失真处理模块,与所述射频发射模块的输入端相连接,用于在所述MMO终端处于工作过程中、且所述功率放大器工作在非线性区域时,在所述输入信号输入所述射频发射模块前,从预设的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述输入信号进行预失真处理;所述预失真系数查找表包括:所述功率放大器的输出功率与预失真系数之间的对应关系; [0009] predistortion processing module, the radio frequency transmission modules connected to the input for the terminal is in a MMO operation, and the power amplifier operates in a nonlinear region, the input signal the radio frequency transmitting module front, the lookup table to acquire the current power amplifier output power from a predetermined pre-distortion coefficient corresponding to the pre-distortion coefficient, and the input signal pre-distortion coefficient according to the pre-acquired distortion processing; the predistortion coefficient lookup table comprises: a correspondence relationship between the output power of the power amplifier and pre-distortion coefficient;

[0010] 所述校准装置,用于在所述MMO終端工作前,获取校准的预失真系数查找表,包括: [0010] The calibration means for the MMO terminal prior work, obtaining pre-distortion coefficient calibration lookup table, comprising:

[0011] 第二天线ロ; [0011] ro antenna;

[0012] 反馈模块,用于将所述射频发射模块输出的射频信号通过所述第一天线ロ反馈至所述第二天线ロ; [0012] The feedback module, for transmitting a radio frequency signal to the RF module output ro ro fed back to the second antenna through the first antenna;

[0013] 射频接收模块,用于对所述反馈至所述第二天线ロ的信号进行下变频及模数转换,获得所述射频发射模块输出射频信号的数字化的反馈信号; [0013] The RF receiving module, a feedback signal emitting module outputs the digitized radio frequency signal to the second antenna signal is fed back to the ro be downconversion and analog to digital conversion, the radio frequency is obtained;

[0014] 比较模块,用于比较所述射频接收模块输出的反馈信号与所述预失真处理模块的输入信号,井根据比较的结果确定所述功率放大器是否工作在非线性区域; [0014] The comparison module for comparing the radio frequency receiver module output signal and the predistortion feedback input signal processing module, determine whether the well operates in a nonlinear region of a power amplifier according to a result of comparison;

[0015] 失真大小确定模块,用于在所述功率放大器工作在非线性区域时,确定所述反馈信号相对于所述预失真处理模块的输入信号的失真大小; [0015] Distortion size determination module, said power amplifier operating in a linear region when determining the feedback signal relative to the size of the predistortion distortion signal input processing module;

[0016] 所述预失真处理模块,进ー步用于在所述功率放大器工作在非线性区域时,根据所述失真大小确定模块确定的失真大小,调整所述预失真系数,直至得到使所述失真大小在预设失真范围内的校准预失真系数。 [0016] The pre-distortion processing module, for further ー into the power amplifier operates in a nonlinear region, the magnitude of the distortion of the pre-distortion coefficient determination module determines the magnitude of the distortion, adjusted, so that until a said distortion the distortion within a predetermined range of the calibration of the pre-distortion coefficient.

[0017] 优选地,所述的校准装置,其中,所述预失真系数查找表中的所述功率放大器的输出功率与所述预失真系数之间的对应关系为: [0017] Preferably, said calibration means, wherein the predistortion coefficient lookup table output power of the amplifier in the correspondence between the pre-distortion coefficient is:

[0018] 所述MMO终端的功率控制字APC的值与所述预失真系数之间的对应关系。 The correspondence between [0018] the power control word value APC MMO terminal and the pre-distortion coefficient.

[0019] 优选地,所述的校准装置,其中,所述预失真系数包括:所述功率放大器的相位调节系数和増益调节系数中的至少ー个。 [0019] Preferably, said calibration means, wherein said pre-distortion coefficient comprises: phase adjusting said coefficients and zo amplifier gain adjustment coefficients in at least ー.

[0020] 优选地,所述的校准装置,其中,所述第二天线ロ为所述MMO終端包含的多个天线口中,除所述第一天线口外的其它天线ロ;所述射频接收模块为与所述第二天线ロ对应的射频接收模块。 [0020] Preferably, said calibration means, wherein said second antenna to said plurality of antennas ro mouth MMO terminal includes, in addition to the first antenna other antenna ro extraoral; a radio frequency receiver module ro corresponding to the second antenna and a radio frequency receiver module.

[0021 ] 优选地,所述的校准装置,其中, [0021] Preferably, the calibration of the apparatus, wherein,

[0022] 所述反馈模块包括: [0022] The feedback module comprising:

[0023] 功分模块,与所述第一天线ロ相连接,用于将所述射频发射模块输出的射频信号分成两路相同的信号; [0023] The power divider module, ro is connected to the first antenna for the radio frequency signal outputted from the radio frequency transmission modules is divided into two identical signals;

[0024] 功率调节模块,用于接收所述两路相同信号中的一路,对所述接收的一路信号进行功率调节,并将所述调节后的信号输入所述射频接收模块; [0024] The power regulation module, configured to receive the same signal in two way, one signal of the received power adjustment, and the adjusted signal is input to the RF receiving module;

[0025] 所述两路信号中的另一路输入所述失真大小确定模块。 Another input [0025] The two signals of the size determination module distortion.

[0026] 优选地,所述的校准装置,其中,所述失真大小确定模块通过分析所述反馈信号的相邻信道功率比ACPR的值,来确定所述反馈信号的失真大小。 [0026] Preferably, the calibration device, wherein the distortion size determination module analyzes the adjacent channel power ratio values ​​ACPR feedback signal to determine the magnitude of the distortion signal by feedback.

[0027] 另ー方面,提供一种多输入多输出终端的校准方法,所述多输入多输出MIMO终端包括:第一天线ロ,及与所述第一天线ロ相连接的射频发射模块,所述射频发射模块包括功率放大器,其中, [0027] ー another aspect, there is provided a method of calibrating a multi-input multi-output terminal, the multiple input multiple output MIMO terminal comprising: a first antenna ro, the first antenna and the radio frequency transmission modules connected to ro, the said RF transmitter module includes a power amplifier, wherein

[0028] 所述MMO终端还包括: [0028] The MMO terminal further comprises:

[0029] 第二天线ロ;[0030] 与所述第二天线ロ相连接的射频接收模块; [0029] ro antenna; [0030] The RF receiver module and the antenna connected ro;

[0031] 预失真处理模块,与所述射频发射模块的输入端相连接,用于在所述MMO终端处于工作过程中、且所述功率放大器工作在非线性区域时,在所述输入信号输入所述射频发射模块前,从预设的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述输入信号进行预失真处理;所述预失真系数查找表包括:所述功率放大器的输出功率与预失真系数之间的对应关系; [0031] predistortion processing module, the radio frequency transmission modules connected to the input for the terminal is in a MMO operation, and the power amplifier operates in a nonlinear region, the input signal the radio frequency transmitting module front, the lookup table to acquire the current power amplifier output power from a predetermined pre-distortion coefficient corresponding to the pre-distortion coefficient, and the input signal pre-distortion coefficient according to the pre-acquired distortion processing; the predistortion coefficient lookup table comprises: a correspondence relationship between the output power of the power amplifier and pre-distortion coefficient;

[0032] 所述校准方法,用于在所述MMO終端工作前对所述预失真系数查找表进行校准,所述校准方法包括如下步骤: [0032] The calibration method for the MMO terminal prior to the working pre-distortion coefficient calibration lookup table, said calibration method comprising the steps of:

[0033] 步骤A,将所述射频发射模块输出的射频信号通过所述第一天线ロ反馈至所述第ニ天线ロ,并通过所述射频接收模块对所述反馈至所述第二天线ロ的信号进行下变频和模数转换,获得所述射频发射模块发射信号的数字化的反馈信号; [0033] Step A, the radio frequency transmission module outputs the RF signal through the first antenna to the first feedback ni ro ro antenna, and the radio frequency receiver via the feedback module to the second antenna ro conversion and analog to digital conversion at a signal, obtain the radio frequency transmission modules transmit the digitized signal, a feedback signal;

[0034] 步骤B,比较所述反馈信号与所述预失真处理模块的输入信号,如果所述功率放大器工作在非线性区域,则调整所述预失真系数,直至得到使所述反馈信号相对于所述预失真处理模块的输入信号的失真大小在预设范围内的校准预失真系数,保存所述功率放大器的输出功率及与所述输出功率对应的校准预失真系数。 [0034] Procedure B, comparing the feedback signal with the predistortion of the input signal processing module, if the power amplifier operates in a nonlinear region, adjusting the predistortion coefficients, until a feedback signal relative to the the predistortion distortion the input signal processing module calibration pre-distortion coefficient within a predetermined range, saving of the power amplifier output power and pre-distortion coefficient corresponding to the calibration of the output power.

[0035] 优选地,所述的校准方法,其中,所述预失真系数查找表中的所述功率放大器的输出功率与所述预失真系数之间的对应关系为: [0035] Preferably, the calibration method, wherein the pre-distortion coefficient corresponding relationship between the lookup table of the power amplifier output power and the predistortion coefficient is:

[0036] 所述MMO终端的功率控制字APC的值与所述预失真系数之间的对应关系; Correspondence between the value of [0036] the power control word MMO terminal APC with the predistortion coefficient;

[0037] 所述步骤B中,所述保存所述功率放大器的输出功率及与所述输出功率对应的校准预失真系数为: [0037] In the step B, the saving of the power amplifier output power and the output power pre-distortion coefficient corresponding to the calibration:

[0038] 保存与所述功率放大器的输出功率对应的功率控制字APC的值及对应的校准预失真系数。 [0038] The saving of the power amplifier output power corresponding to the power control value and the corresponding alignment word APC predistortion coefficients.

[0039] 优选地,所述的校准方法,其中,所述步骤B中,通过判断所述反馈信号的相邻信道功率比ACPR的值是否在预设的范围内,来确定所述反馈信号相对于所述预失真处理模块的输入信号的失真大小是否在预设的范围内。 [0039] Preferably, the calibration method, wherein the step B, the adjacent channel power by determining whether the feedback signal within a predetermined range, determining a ratio value of the feedback signal relative ACPR input to the predistortion signal processing module whether the size of the distortion within a predetermined range.

[0040] 优选地,所述的校准方法,其中,所述步骤A之前还包括:将所述射频发射模块输出的射频信号分成相同的两路的步骤; Before [0040] Preferably, the calibration method, wherein the step A further comprises: a radio frequency signal output by the radio frequency transmission modules is divided into two steps of the same;

[0041 ] 所述两路中的一路通过所述第二天线ロ反馈至所述射频接收模块,所述两路中的另一路用于确定所述反馈信号的失真大小。 [0041] The two-way by way of the second antenna is fed back to the ro RF receiving module, the other of said two paths for determining the magnitude of the distortion of the feedback signal.

[0042] 优选地,所述的校准方法,其中,所述步骤B还包括: [0042] Preferably, the calibration method, wherein said step B further comprises:

[0043] 调整所述功率放大器的输出功率范围,以获得所述功率放大器的非线性输出功率区域内、不同输出功率点对应的校准预失真系数,并利用所述不同输出功率点对应的校准预失真系数生成校准的预失真系数查找表。 Non-linear output power region [0043] adjustment of the power amplifier output power range, to obtain the power amplifier, the output power of the different calibration points corresponding to pre-distortion coefficient, and using the different output power point corresponding to the pre-calibration generating pre-distortion coefficient distortion coefficient calibration lookup table.

[0044] 优选地,所述的校准方法,其中,通过调整所述MMO终端的功率控制字APC的值来调整所述功率放大器的输出功率范围。 [0044] Preferably, the calibration method, wherein, by adjusting the MMO terminal APC power control word to adjust the value of the power amplifier output power range.

[0045] 优选地,所述的校准方法,其中,在生成所述校准的预失真系数查找表后,在所述MIMO终端的工作过程中,还包括: [0045] Preferably, the calibration method, wherein the lookup table generator of predistortion coefficients of the calibration during operation of the MIMO terminal, further comprising:

[0046] 步骤a,获取所述功率放大器的输出功率; [0046] Step a, to obtain an output power of the power amplifier;

[0047] 步骤b,在所述功率放大器工作在非线性区域时,所述预失真处理模块根据所述功率放大器的输出功率,从所述校准的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述预失真处理模块的输入信号进行预失真处理,并将所述预失真处理后的信号输入所述射频发射模块进行发射。 [0047] Step B, in accordance with the output power of the power amplifier, the lookup table acquired from the power amplifier pre-distortion coefficient of the calibration at the power amplifier operates in a nonlinear region, the predistortion processing module the current output power corresponding pre-distortion coefficient, and the pre-distortion processing in pre-distortion input signal processing module according to the acquired pre-distortion coefficient, and the pre-distortion processing the input signal to the RF transmitter module to transmit.

[0048] 上述技术方案中的一个技术方案具有如下技术效果: [0048] The technical solution of a technical solution has the following technical effects:

[0049] 通过在MMO终端中设置预失真处理模块,及在MMO终端工作前对预失真处理模块使用的预失真系数查找表中的预失真系数进行校准,在功率放大器工作在非线性区域时,在基带信号输入射频发射模块前,从校准的预失真系数查找表中获取与功率放大器当前的输出功率相对应的预失真系数,井根据获取的预失真系数对输入的基带信号进行预失真处理,可提高功率放大器的线性性能,从而改善了MMO終端系统的线性性能,满足了LTE对功率放大器高线性度的要求。 [0049], and the pre-distortion coefficients for the pre-distortion processing module uses pre-distortion coefficient lookup table calibrated before MMO terminal working by providing the pre-distortion processing module MMO terminal, when the power amplifier operates in a nonlinear region, before the baseband signal input radio frequency transmission modules, the lookup table to acquire the power amplifier current power output from the pre-distortion coefficient calibration corresponding to the pre-distortion coefficient, wells pre-distortion processing on the input baseband signal according to the pre-distortion coefficient acquired, can improve the linearity performance of the power amplifier, thereby improving the linearity performance MMO terminal system, the LTE to meet the requirements of high linearity power amplifier.

附图说明 BRIEF DESCRIPTION

[0050] 图I为本发明实施例的MMO终端的结构示意图; [0050] FIG structural diagram I MMO terminal according to the invention of the present embodiment;

[0051] 图2为本发明实施例的MMO终端的校准装置的结构示意图; [0051] FIG. 2 is a schematic configuration of the calibration apparatus MMO terminal according to the present embodiment of the invention;

[0052]图3为利用本发明实施例的校准装置对本发明实施例的MMO终端进行校准的原理示意图; Principle MMO Terminal [0052] FIG. 3 is a embodiment of the invention using the calibration device of the embodiment of the present invention for calibrating a schematic view;

[0053] 图4为本发明实施例的MMO终端的校准方法的流程示意图; [0053] FIG. 4 is a schematic flow calibration method MMO terminal according to embodiments of the present invention;

[0054] 图5为利用本发明实施例的校准方法生成校准的预失真系数查找表LUT后,MIMO終端在工作过程中的射频发射方法的流程示意图; [0054] FIG. 5 is a lookup table using the LUT, the RF transmitter process flow MIMO terminal during operation of the calibration method according to the schematic generator of predistortion coefficients embodiment of the present invention, calibration;

[0055] 图6为MMO终端利用校准后的LUT进行射频发射的工作原理示意图。 [0055] FIG. 6 is a schematic view of the working principle of MMO terminal uses a radio frequency to the calibrated LUT emission.

具体实施方式 Detailed ways

[0056] 为使本发明的目的、技术方案和优点更加清楚,下面将结合附图及具体实施例对本发明进行详细描述。 [0056] To make the objectives, technical solutions, and advantages of the invention more clearly, the accompanying drawings and the following specific embodiments of the present invention will be described in detail.

[0057] 本发明人在实现本发明的过程中发现多输入多输出(Multiple-InputMultiple-Output,MIM0)技术作为一个关键技术在LTE中得到应用。 Al. [0057] The present inventors have found that the MIMO (Multiple-InputMultiple-Output, MIM0) technology as a key technology has been applied in LTE in the process of implementing the present invention. MIMO技术拥有很多优点:可以在不増加信道带宽的情况下,成倍的増加系统的容量,从而有效提高了系统的频谱利用率;还可以通过分集来提高信号传输的质量。 MIMO technology has many advantages: the case may be without having to increase the channel bandwidth to increase in the capacity of the system is doubled, so as to effectively improve the spectrum utilization of the system; can also improve the quality of signal transmission through diversity. 本发明人在本发明中开发了MIMO的另外ー种应用,基于MIMO技术提出的ー种改善射频发信机线性性能的方法。 The present inventors developed the present invention in a MIMO further ー of applications, a method to improve the radio frequency transmitter ー species linearity performance based on MIMO technology proposed. 本发明人在实现本发明的过程中发现:对于早期的移动终端,预失真技术很难得到应用的一个重要原因是它需要加ー个额外的接收机,这增加了终端的成本,而在MIMO多天线系统中不需要另加接收机,这就为预失真的应用提供了可能。 The present inventors have found that in the process of implementing the present invention: an important reason for the early mobile terminal, a predistortion technique is that it is difficult to apply ー need to add extra receiver, which increases the cost of the terminal, and in the MIMO multi-antenna system does not require an additional receiver, which provides the possibility to apply a pre-distortion.

[0058] 图I为本发明实施例的MMO终端的结构示意图。 [0058] The schematic structure of the embodiment of MMO terminal I of the present invention FIG. 如图1,该MMO终端包括: 1, the MMO terminal comprising:

[0059] 第一天线ロ101 ;射频发射模块102,包括功率放大器103,该射频发射模块与第一天线ロ相连接,用于对输入信号如基带信号进行数模转换、调制、及通过功率放大器对调制后的信号进行功率放大,并将功率放大器的输出信号通过第一天线ロ输出,具体的,在MMO终端的工作过程中,功率放大器输出的信号通过设置在第一天线ロ的第一天线发射出去;预失真处理模块104,与射频发射模块的输入端相连接,用于在MMO終端处于工作过程中、且功率放大器工作在非线性区域吋,在输入信号输入射频发射模块前,从预设的预失真系数查找表中获取与功率放大器当前的输出功率相对应的预失真系数,井根据获取的预失真系数对输入信号进行预失真处理,经过预失真处理后的信号再输入射频发射模块;其中,预失真系数查找表包括:功率放大器的输出功率与预失 [0059] ro a first antenna 101; radio frequency transmission modules 102, 103 includes a power amplifier, the radio frequency transmission module is connected to the first antenna ro, an input signal as a baseband signal for digital to analog conversion, modulation, and through the power amplifier the modulated signal power amplification, and the output signal of the power amplifier output via a first antenna ro, particularly, during operation of the MMO terminal, the power amplifier output signal is provided by a first antenna in a first antenna ro emitted; pre-distortion processing module 104, and the input terminal of radio frequency transmission modules are connected, a terminal for MMO in operation, and the power amplifier operating in a linear region inch, before the input signal is input radio frequency transmission modules, from the pre- predistortion coefficient of the pre-distortion coefficient lookup table to acquire the current output power of the power amplifier corresponding to wells predistortion processing the input signal according to the pre-distortion coefficient acquired signal after predistorted input radio frequency transmission modules then ; wherein the predistortion coefficient lookup table comprising: a power amplifier output and the predistortion 系数之间的对应关系。 Correspondence between the coefficients.

[0060] 示例性地,由于MIMO终端可根据预先存储的自动功率控制字(AutomaticPowerControl, APC)的值确定射频发射模块的发射功率,并进而获取功率放大器的输出功率值,即APC的值能够指示功率放大器的输出功率,所以预失真系数查找表中的功率放大器的输出功率与预失真系数之间的对应关系可通过MMO终端的功率控制字APC的值与所述预失真系数之间的对应关系来表示。 [0060] Illustratively, since the terminal may determine a MIMO radio frequency transmission modules transmit power, thus obtaining an output power of the power amplifier according to an automatic power control word stored in advance (AutomaticPowerControl, APC) value, i.e. the value can indicate APC output power of the power amplifier, the predistortion coefficient lookup correspondence relationship between the output power and the pre-amplifier distortion coefficient table may be a correspondence between the pre-distortion coefficient by the value of the power control word and the APC terminal MMO To represent.

[0061] 优选地,当预失真系数查找表LUT中存储的为:APC的值与预失真系数之间的对应关系时,预失真处理模块在进行预失真处理时,获取APC的值,并从LUT中查找出与获取的APC的值对应的预失真系数来进行预失真处理。 [0061] Preferably, when the pre-distortion coefficient lookup table stored in the LUT: a correspondence relationship between the value of the pre-distortion coefficient APC, the predistortion processing module when performing predistortion processing, the APC value is acquired, and from LUT find out the pre-distortion coefficient corresponding to the value obtained for the APC to predistortion processing.

[0062] 本发明的实施例提供了一种设置有预失真处理模块的MMO終端,该实施例的MIMO终端,在工作过程中,通过获取功率放大器的输出功率,在功率放大器工作在非线性区域时,通过查找预设的预失真系数查找表LUT,确定与当前功放输出功率相对应的预失真系数,来对输入预失真处理模块的输入信号进行预失真处理,可提高功率放大器的线性性能,进而提高该MIMO系统射频发射模块如射频发信机的线性性能。 [0062] Embodiments of the present invention there is provided a predistortion processing module is provided with a terminal of the MMO, the MIMO terminal according to the embodiment, during operation, by obtaining the output power of the power amplifier, the power amplifier operating in a linear region when, by looking up a preset lookup table LUT predistortion coefficient, and determining the current power amplifier output power corresponding to the pre-distortion coefficient, predistortion processing is performed on the input signal pre-distortion processing module can be improved linearity performance of the power amplifier, the MIMO system module further improve linearity of the transmitter radio frequency RF transmitter. 其中,当前功率放大器的输出功率可通过获取MMO终端的APC的值来获得。 Wherein the current amplifier output power can be obtained by acquiring the value of the APC MMO terminal.

[0063] 优选地,预失真系数查找表存储在MMO终端的存储模块中。 [0063] Preferably, the predistortion coefficient look-up table stored in the storage module MMO terminal.

[0064] 优选地,预失真系数查找表中存储的预失真系数包括:功率放大器的相位调节系数和増益调节系数中的至少ー个。 [0064] Preferably, the predistortion coefficients stored in the look-up table predistortion coefficients comprises: coefficients and zo phase adjusting amplifier gain adjustment coefficients in at least ー. 示例性地,预失真系数查找表包括两个ニ维表:相位调节系数-功率表及増益调节系数-功率表。 Illustratively, pre-distortion coefficient lookup table comprises two ni-dimensional table: phase adjusting coefficient - power meter and gain adjustment factor zo - power meter. 在MMO终端工作过程中,根据功率放大器的输出是相位失真还是增益失真,选择相应的相位调节系数和/或増益调节系数来对输入信号进行预失真处理。 MMO terminal during operation in accordance with the output of the power amplifier is gain distortion or phase distortion, select the respective phase adjustment coefficient and / or gain adjustment coefficients for enlargement of pre-distortion processing on the input signal.

[0065] 示例性地,在具体实现中,本发明实施例的预失真处理模块可利用现有的多种预失真器,如多种数字基带预失真器来实现。 Predistortion processing module [0065] Illustratively, in a particular implementation, the embodiments of the present invention may utilize a variety of conventional predistorter, such as various digital baseband predistorter to achieve. 预失真处理模块包括:由FIR滤波器实现的矢量増益调节器。 Predistortion processing module comprises: a FIR filter implementation of the enlargement of vector gain regulator. 矢量増益调节器通过修正FIR滤波器的FIR系数来调整输入信号的相位和/或増益的失真大小。 Zo FIR gain adjustment coefficient vector by correcting distortion of the FIR filter to adjust the phase of the input signal magnitude and / or zo beneficial.

[0066] 优选地,本发明实施例的MMO终端中的预失真系数查找表中的预失真系数是经过校准的预失真系数查找表。 [0066] Preferably, the pre-distortion coefficient MMO terminal embodiment of the present invention, a lookup table of pre-distortion coefficient is the result of pre-distortion coefficient calibration lookup table. 示例性地,该校准的LUT可以是通过与MMO终端的工作过程分离开的校准过程来获得的。 Illustratively, the LUT may be calibrated by a calibration procedure and operations MMO be separated from the terminal obtained. 具体的,如可以是在MMO终端出厂前校准好的。 Specifically, as can be factory calibrated in good MMO terminal.

[0067] 由于MMO终端具有多天线,在对本发明实施例的MMO的LUT进行校准时,可利用MIMO终端的ー个天线进行射频发射,并通过该发射天线的天线ロ,及利用另ー个天线的天线口和对应的射频接收机来方便地获取射频发射机输出的射频信号的反馈信号,从而可方便、精确地实现对LUT的校准。 [0067] Since the MMO terminal having multiple antennas, When calibrating the LUT MMO embodiment of the present invention, a MIMO terminal ー antennas for radio frequency transmission and ro by the transmitting antenna an antenna, and using another ー antennas the antenna interface and a corresponding RF receiver to easily obtain a feedback signal of an RF signal output from the RF transmitter, so as to be easily and accurately achieve calibration of the LUT.

[0068] 图2示出了用于对本发明实施例的MMO终端的预失真系数查找表LUT进行校准的校准装置的结构示意图。 [0068] FIG. 2 shows a predistortion coefficient to an embodiment of the present invention is a terminal lookup table LUT MMO schematic configuration of the calibration means performs a calibration. 本发明实施例的校准装置用于在MMO終端工作前,获取设置的预失真系数查找表,并对其设置的预失真查找系数表进行校准。 The calibration apparatus for an embodiment of the present invention before working MMO terminal, obtaining predistortion coefficient look-up table is provided, and its set pre-distortion coefficient lookup table calibrated. 图2中,同时示出了校准装置与MMO终端的连接关系。 Figure 2, also shows the connection relation with the calibration device MMO terminal. 如图2,该校准装置包括:第二天线ロ201 ;反馈模块202,用于将射频发射模块输出的射频信号通过第一天线ロ反馈至第二天线ロ;射频接收模块203,与第二天线ロ相连接,用于接收反馈至所述第二天线ロ的信号,对所述接收的信号进行下变频及模数转换,获得所述射频发射模块输出的射频信号的数字化的反馈信号;比较模块204,用于比较射频接收模块输出的反馈信号与预失真处理模块的输入信号,井根据比较的结果确定所述功率放大器是否工作在非线性区域;失真大小确定模块205,用于在所述功率放大器工作在非线性区域时,确定所述反馈信号相对于所述预失真处理模块的输入信号的失真大小;上述预失真处理模块,进ー步用于在功率放大器工作在非线性区域时,根据所述失真大小确定模块确定的失真大小,调整预失真系数,直至得到使所述反馈信 2, the calibration apparatus in FIG comprising: a second antenna ro 201; 202 feedback module, for transmitting a radio frequency signal to the RF module output through the first antenna to the second antenna ro ro feedback; RF receiving module 203, and the second antenna ro is connected for receiving the feedback signal to the second antenna ro, for the conversion of the received signal and the analog to digital conversion, the feedback signal to obtain the digitized RF signal outputted from the radio frequency transmission modules; comparison module 204, the input signal is a radio frequency receiver for comparing the feedback signal with the predistortion module output processing module, according to a well determined whether the result of the comparison of the power amplifier operates in a nonlinear region; distortion size determination module 205, the power for amplifiers operating in linear region, the feedback signal determining the predistortion distortion the input signal processing module with respect; the pre-distortion processing module, for further feed ー non-linear power amplifier operating in the region, in accordance with the size determination module determines the distortion magnitude of the distortion, adjusting the predistortion coefficients, the feedback channel until a 的失真大小在预设失真范围内的校准预失真系数,并保存所述功率放大器的输出功率及与所述功率放大器的输出功率对应的校准预失真系数,以生成校准的预失真系数查找表。 The magnitude of the distortion calibrating distortion within a predetermined range of the pre-distortion coefficient, and saving of the power amplifier output power and the output power of the power amplifier pre-distortion coefficient corresponding to the calibration to calibration of predistortion coefficients generated lookup tables.

[0069] 应该明白的是,由于MMO终端的两个天线离的很近,属于近场,一个天线不能从与它相邻的天线上获取信号,所以在利用本发明实施例的校准装置进行校准时,反馈的射频信号是从未扣上天线之前的天线ロ即天线端ロ获得的。 [0069] It should be appreciated that, due to the two terminals of the antenna MMO from the close, near field belongs, a signal from the antenna can not obtain its adjacent antenna, the calibration is performed using the calibration device according to the present embodiment of the invention when the RF feedback signal is never before wear antenna ends of the antenna, antenna ro ro obtained.

[0070] 优选地,上述保存功率放大器的输出功率及与所述输出功率对应的校准预失真系数为:保存与所述功率放大器的输出功率对应的功率控制字APC的值及对应的校准预失真系数。 [0070] Preferably, the output power of the power amplifier and pre-stored calibration output power corresponding to the distortion coefficient as follows: hold the value corresponding to the calibration and the output power of the corresponding power amplifier control word APC predistortion coefficient.

[0071] 本发明实施例的校准装置利用MMO终端的多天线特点来精确获取射频发射信号的反馈信号,以进行校准。 [0071] The multi-antenna feedback signal characteristics calibration apparatus using the embodiment of the present invention MMO terminal to accurately acquire radio frequency transmit signal, for calibration. 优选地,上述第二天线ロ为MMO終端包含的多个天线的天线ロ中,除所述第一天线口外的其它天线ロ;上述述射频接收模块为MMO終端中与上述第二天线ロ对应的射频接收机。 Preferably, a plurality of antenna ro ro antennas of the second antenna terminal is included in the MMO, in addition to the other antenna of the first antenna extraoral ro; and the said module is a radio frequency receiver and MMO ro terminal corresponding to the second antenna RF receiver.

[0072] 优选地,上述比较模块,可利用现有的多种信号比较器来实现。 [0072] Preferably, the comparison module may be implemented using a variety of existing signal from the comparator. 示例性地,上述比较模块可通过判断反馈信号与预失真处理模块的输入信号之间的信号差是否小于预设的阈值,来确定功率放大器是否工作在线性区内;其中,当所述信号差小于预设的阈值时,确定功率放大器工作在线性区域;否则,工作在非线性区域。 Illustratively, the comparison module determines whether the signal by a difference between an input signal and a feedback signal pre-distortion processing module is less than a preset threshold value to determine whether the power amplifier operates in the linear region; wherein, when said difference signal less than a preset threshold value to determine the power amplifier operating in the linear region; otherwise, it operates in a nonlinear region.

[0073] 图3为利用图2所示的校准装置对本发明实施例的MMO终端进行校准的原理示意图。 Simplified schematic MMO terminal [0073] FIG. 3 is a calibration using the apparatus shown in FIG. 2 embodiment of the present invention will be calibrated. 如图3,该例的校准装置中,反馈模块还包括:与第一天线ロ相连接的功分模块、与功分模块相连接的功率调整模块。 Calibration means of the embodiment in FIG. 3, the feedback module further comprising: a power adjustment module connected to the first power divider module ro antenna connected with the power divider module relative. 该例中,失真大小确定模块实现为频谱分析模块。 In this embodiment, the distortion size determination module implemented as a spectral analysis module. 功分模块,如功分器,用于将功率放大器的输出信号分成两路相同的信号,输出的两路信号,一路接到功率调整模块如功率衰减器,由功率调整模块对其接收的这一路信号进行功率调整,并将调整后的信号通过第二天线ロ输入射频接收模块,以反馈至比较模块;另一路信号输出到频谱分析模块,如频谱分析仪,在对预失真系数进行调节的过程中,可通过频谱分析仪来观察分析这一路信号的线性度指标如该路信号的相邻信道功率比ACPR的值,通过分析该路信号的线性度指标来得到反馈信号的线性度指标,至找到使反馈信号的ACPR的值在预设范围内的校准预失真系数,从而可确定出反馈信号与预失真处理模块的输入信号相比的失真大小,进而确定出功率放大器的输出信号与预失真处理模块的输入信号相比的失真大小。 Power divider module, such as a power divider, the power amplifier for the output signal into two identical signals, the output signals of the two, all the way to the power adjustment module The power attenuator, the power adjustment module in which receives One signal power adjustment, and the adjusted signal via the second antenna receiving a radio frequency input module ro to feed back to the comparison module; further output signals to spectrum analysis module, such as spectrum analyzers, the predistortion coefficients for adjusting process, can be observed by the spectrum analyzer linearity specifications of the signals such as adjacent channel power of the channel signal value than the ACPR to obtain linearity index feedback signal by analyzing the linearity specifications of the channel signal, to find the calibration feedback signal pre-distortion coefficient within a predetermined range of values ​​ACPR, which can determine the magnitude of the distortion compared to the input signal pre-distortion feedback signal processing module, and to determine the output signal of the power amplifier and pre processing the input signal distortion compared to the size of the block distortion. 示例性地,该频谱分析仪可以是PSA。 Illustratively, the spectrum analyzer may be a PSA. 示例性地,上述衰减模块为可调的衰减器,用于为射频接收模块提供合适的功率范围的信号。 Illustratively, the attenuator module provides a suitable signal for the power range of the RF receiver module adjustable attenuator for. 示例性地,可以是校准的操作员通过观察频谱分析模块的分析结果,来手工调整预失真系数,也可以是频谱分析模块自动将分析结果输入预失真处理模块,由预失真处理模块根据输入的分析结果自动调整预失真系数。 Illustratively, it may be calibrated operator spectrum analysis result of the analysis module by observation, to manually adjust the pre-distortion coefficients, may be a spectrum analysis module automatically results input predistortion processing module, a pre-distortion processing module based on the input The results automatically adjust the pre-distortion coefficients.

[0074] 如图3,输入射频发射模块的信号,经数模转换模块如D/A转换器的数模转换后,由调制模块进行上变频,再通过功率放大器放大输出,通过第一天线ロ输出。 [0074] 3, the radio frequency transmission modules of the input signal, the digital-analog converter module as shown in FIG conversion D / A converter, the conversion is performed by modulation module, and then amplified by the power amplifier output, the first antenna ro output. 功率放大器输出的射频信号经功分模块、功率调节模块后,射频接收模块通过第二天线ロ接收该信号,并将接收的信号经解调模块的下变频、模数转换模块如A/D转换器的模数转换后,获得射频发射模块输出的射频信号的数字化的反馈信号,并将该反馈信号输入比较模块;比较模块比较预失真处理模块的输入信号和接收到的反馈信号,判断出功率放大器工作在非线性区域时,预失真处理模块调整预失真系数,使反馈信号相对于预失真处理模块的输入信号的失真大小在预设的失真范围内,这样可以获得功率放大器工作在非线性区域时的不同输出功率点时的校准预失真系数,保存所述功率放大器的输出功率及与该输出功率对应的校准预失真系数,以生成校准的LUT。 A radio frequency signal power divider module, the power adjustment module, the radio frequency signal receiving module ro receive the power amplifier output through the second antenna, and the received signal is downconverted demod module, such as analog to digital conversion module A / D converter after analog to digital filter conversion to obtain digital feedback signal is a radio frequency signal RF transmitting module output, and the feedback signal input comparison module; input signal comparison module compares the pre-distortion processing module and the received feedback signal, determines the power when the amplifier operates in the nonlinear region, predistortion processing module adjusts the pre-distortion coefficient, so the feedback signal with respect to the magnitude of the distortion module predistorted input signal within a predetermined range of distortion, which can be obtained in a nonlinear amplifier operating area calibration of predistortion coefficients stored in the output power of the power amplifier output power at different points during a calibration and pre-distortion coefficient corresponding to the power output to generate a calibration LUT. 利用该校准的LUT,MMO在工作过程中时,可以更准确地对输入信号进行预失真处理,以提高射频发信机的线性度。 Using the calibration LUT, MMO when during operation, more accurately the input signal pre-distortion processing, to improve the linearity of the radio frequency transmitter.

[0075] 具体实现中,在射频发射模块中还具有与功放的输出端相连接的前端器件,如开关,以控制功放输出的信号是否通过天线发射;在射频接收模块中还具有与解调模块的输入端相连接的前端器件,如开关,以控制射频接收模块是否接收发射信号。 [0075] In specific implementation, the radio frequency transmission module further includes a front-end device connected to the output terminal of the amplifier, such as a switch to control the amplifier output signal is transmitted through an antenna; RF receiving module further includes a demodulation module a front end connected to the input of the device, such as a switch to control whether the RF receiving module receives the transmitted signal.

[0076] 优选地,MMO终端的LUT校准完成后,校准装置中除MMO终端包含的第二天线ロ和射频接收模块外,其它模块均可卸载掉。 [0076] Preferably, the calibration LUT MMO terminal is completed, the calibration device, in addition to the second antenna and the RF receiving module MMO ro terminal included, other modules can be uninstalled.

[0077] 优选地,MIMO终端的LUT校准完成后,在MMO终端的工作过程中,反馈模块的馈点断开不工作。 [0077] Preferably, the calibration LUT MIMO terminal is completed, the terminal MMO during operation, the feed point of the feedback module off does not work.

[0078] 图4为本发明实施例的MMO终端的校准方法的流程示意图,用于在MMO终端エ作前对MIMO终端的LUT进行校准。 [0078] FIG. 4 is a schematic flowchart of the calibration method of the embodiment MMO terminal according to the present invention, for calibration LUT MIMO terminal before the terminal Ester for MMO. 下面结合图3、图4对本发明实施例的校准方法的步骤进行说明。 Below in connection with FIG. 3, step calibration method of the embodiment 4 of the present invention will be described with FIG. 该实施例的校准方法包括: The calibration method of an embodiment comprises:

[0079] 步骤401,将所述射频发射模块输出的射频信号通过所述第一天线ロ反馈至第二天线ロ,并通过所述射频接收模块对所述反馈至第二天线ロ的信号进行下变频和模数转换,获得所述射频发射模块输出信号的数字化的反馈信号; [0079] Step 401, the radio frequency transmission module outputs the RF signal through the first antenna to the second antenna ro ro feedback, and a signal receiving module of antenna ro by the feedback to the radio frequencies frequency conversion and analog-digital conversion to obtain the feedback signal output of the radio frequency transmission modules of the digitized signal;

[0080] 该步骤中,利用MMO系统多天线的特点,方便地把功率放大器(POWERAMPLIFIER,PA)的输出信号通过MMO的一个天线ロ发射并通过MMO的另一天线ロ获得反馈信号,并通过该另一天线ロ对应的射频接收模块,如射频接收接收机,并通过调制模块进行下变频变换、和模数转换模块即A/D转换器采样得到数字化的反馈信号。 [0080] In this step, using a multiple antenna characteristics MMO system, the output signal of the power amplifier and easily (POWERAMPLIFIER, PA) and the ro ro feedback signal emitted by another antenna via a MMO MMO antenna, and through the ro another antenna module corresponding to a radio frequency receiver, a radio frequency receiver such as the receiver, and frequency conversion by modulating the module, i.e., and analog to digital conversion module a / D converter digitizing the sampled feedback signal.

[0081] 步骤402,比较上述反馈信号与预失真处理模块的输入信号,如果所述功率放大器工作在非线性区域,则调整预失真系数,直至得到使反馈信号相对于预失真处理模块的输入信号的失真大小在预设的失真范围内的校准预失真系数,保存功率放大器当前的输出功率及与该输出功率对应的校准预失真系数。 [0081] Step 402, the input signal for comparing the feedback signal with the predistortion processing module, if the power amplifier operates in a nonlinear region, the pre-distortion coefficient adjustment, until a feedback signal with respect to the pre-distortion input signal processing module the magnitude of the distortion calibrating distortion within a predetermined range of the pre-distortion coefficient, save the current power amplifier output power and pre-distortion coefficient corresponding to the calibration of the output power.

[0082] 在调整的过程中,预失真处理模块利用当前的预失真系数对输入信号进行预失真处理,通过频谱分析模块如频谱分析仪判断反馈信号的ACPR的值是否在预设的范围内来确定反馈信号的失真大小是否位于预设的范围内,在反馈信号的失真大小不满足预设条件即不在预设范围内时,继续调整预失真系数,直至找到使所述反馈信号相对于预失真处理模块的输入信号的失真大小在预设的失真范围内的预失真系数,将该找到的预失真系数作为校准的预失真系数。 [0082] In the adjustment process, predistortion processing module using the current pre-distortion coefficient of the input signal pre-distortion processing, the spectrum analyzer is determined as a feedback signal by spectral analysis module ACPR whether the value of a predetermined range when determining the magnitude of the distortion of the feedback signal is within a preset range, the magnitude of the distortion does not satisfy the preset condition, i.e., a feedback signal is not within a predetermined range, to adjust the pre-distortion coefficient continued until the feedback signal relative to the predistortion found processing an input signal module distortion the pre-distortion coefficient within a predetermined range of distortion, the pre-distortion coefficient found as a calibration pre-distortion coefficient.

[0083] 在该步骤中,通过反馈信号与预失真处理模块的输入信号相比较,可以判断出功率放大器是否工作在线性区域,如增益线性区域。 [0083] In this step, by comparing the feedback signal with the input signal pre-distortion processing module, it may determine whether the power amplifier operates in a linear area, such as the linear gain region. 具体地,可以利用现有的比较器来进行上述比较。 In particular, the comparison can be performed using a conventional comparator. 示例性地,可设定在反馈信号与基带预失真器的输入信号的差值小于预定的阈值时,确定功率放大器工作在线性区域;否则,确定功率放大器工作在非线性区域。 Illustratively, the difference may be set in the feedback signal and the input signal is a baseband predistorter is less than a predetermined threshold value, the power amplifier operates in the linear region is determined; otherwise, it is determined in the nonlinear amplifier operating regions.

[0084] 预失真处理模块主要在放大器的非线性区域进行预失真处理。 [0084] The pre-distortion processing module predistort the non-linear region of the amplifier. 该步骤中,如果功率放大器工作在线性区域,不对输入信号做任何预失真处理,并调整終端中预先存储的功率控制字APC的值,通过调整APC的值来调整功率放大器的输出功率,以对功率放大器的输出功率范围内时的其它输出功率点的预失真系数进行校准;如果工作在非线性区域,读取APC值,根据APC值获得射频发射模块当前的发射功率,并进而获得功率放大器当前的输出功率,调节预失真系数,直到功率放大器的输出信号与预失真处理模块输入信号的失真大小在预设的范围内,示例性地,调节预失真系数直到反馈信号的线性度指标ACPR的值在预设的范围内,该调节后的预失真系数即为功率放大器当前输出功率下的校准预失真系数,读取该校准系数,并保存功率放大器当前的输出功率及该功率对应的校准预失真系数,示例性地,可通过保存APC值来指示上述 In this step, if the power amplifier operates in the linear region, the input signal does not do any predistortion processing, and adjusts the power of the terminal stored in advance in the control word value of APC, the power amplifier is adjusted by adjusting the value of the output power of the APC, of ​​at the power amplifier output power range of the output power pre-distortion coefficient other points during the calibration; if operates in a nonlinear region, reads the APC value, APC value obtained radio frequency transmission modules according to the current transmit power, and thus obtained current amplifier output power, adjusting the predistortion coefficients, until the output signal of the power amplifier and pre-distortion processing module distortion of the input signal magnitude within a predetermined range, exemplarily adjusted until the value of the linear feedback ACPR index signal pre-distortion coefficient within a predetermined range, the pre-distortion coefficient after adjustment calibration is the power amplifier pre-distortion coefficient at the current output, reads the calibration coefficients, and save the power amplifier output power and the current corresponding to the power calibration predistortion coefficient, illustratively, may be indicated by storing the above-described APC value PA的输出功率。 PA output power. 该例中,通过调节预失真系数,来调节预失真处理模块对输入信号进行的预失真处理,直至找到合适的预失真系数使得功率放大器的输出信号与预失真处理模块的输入信号相比,失真在预设的范围内。 The output signal of the embodiment, by adjusting the predistortion coefficients to adjust the predistortion processing module predistortion processing the input signal until a suitable pre-distortion coefficient found that compared to the input signal of the power amplifier predistortion processing module, distortion within a preset range. 示例性地,可选择使ACPR的值最小的预失真系数作为校准的预失真系数。 Illustratively, the minimum value may elect to pre-distortion coefficient ACPR as pre-distortion coefficient calibration.

[0085] 步骤403,调整功率放大器的输出功率范围,在所述功率放大器的非线性输出功率区域内、不同输出功率点下执行上述步骤402,获得功率放大器的非线性输出功率区域内时、不同输出功率点对应的校准预失真系数,并利用不同的输出功率与对应的校准预失真系数生成校准的预失预失真系数查找表。 When the non-linear output power region [0085] Step 403, adjusting the power amplifier output power range, in non-linear region of the power amplifier output power, the above steps 402 points at different power output, the power amplifier is obtained, except calibration point corresponding to the output power pre-distortion coefficient, and with different output power and pre-distortion coefficient corresponding to the calibration of the predistortion to generate a calibration look-up table predistortion coefficients.

[0086] 该步骤中,上述调整功率放大器的输出功率范围,主要是在功率放大器的非线性区域内调整PA的输出功率。 [0086] In this step, the adjustment range of the output power of the power amplifier PA is mainly to adjust the output power of the power amplifier in a nonlinear region.

[0087] 在该步骤中,上述调整功放的输出功率范围具体可通过在功放的増益非线性区域分步长调整APC控制字的值来实现,每调整到一个控制字,就调整预失真系数,并通过比较器判断功放在当前输出功率下输出信号的失真的大小,找到使功率放大器输出信号的线性度指标ACPR值在预设范围内的预失真系数,记录这个系数,这时的输出功率可通过读取APC控制字来获得,于是就找到了与这个输出功率对应的预失真系数,把这个输出功率以及对应的预失真系数存储生成校准的预失真系数查找表。 [0087] In this step, the output power range of the adjusting amplifier may specifically by fractional length adjustment zo gain linear region of the amplifier value APC control word is achieved, each tuned to a control word, to adjust the pre-distortion coefficient, is determined by the comparator and the output of the amplifier magnitude distortion of signals at the current output power, the output signal of the power amplifier to find linearity index value ACPR pre-distortion coefficient within a predetermined range, recording the coefficients, when the output power by reading the control word to obtain the APC, and thus to find the output power corresponding pre-distortion coefficient, the pre-distortion coefficient corresponding to the output power, and stores the generated pre-distortion coefficient calibration lookup table. 优选地,校准的预失真系数查找表中保存的是MMO终端的APC的值与预失真系数之间的对应关系。 Preferably, the calibration of predistortion coefficients stored in the lookup table is a correspondence relationship between the value of the pre-distortion coefficient APC MMO terminal.

[0088] 在生成上述校准的预失真系数查找表后,MIMO终端在工作过程中,通过查找存储的上述校准的LUT,对预失真处理模块的输入信号进行预处理,可以改善射频发信机的线性度。 [0088] After the predistortion coefficients in the look-up table to generate the calibration, the MIMO terminals during operation, by finding the above-described calibration of the LUT memory, the processing module of the pre-distortion input signal preprocessing is possible to improve the radio frequency transmitter linearity.

[0089] 优选地,在生成校准的预失真系数查找表后,在MMO的工作过程中,在功率放大器工作在非线性区域时,预失真处理模块根据功率放大器的输出功率,从校准的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述预失真处理模块的输入信号进行预失真处理,并将所述预失真处理后的信号输入所述射频发射模块进行发射。 [0089] Preferably, after generating the pre-distortion coefficient calibration lookup table, during operation of the MMO, nonlinear amplifier operating in the region, according to predistortion processing module output power amplifier, the calibration of the predistortion coefficient lookup table obtaining predistortion coefficients of the power amplifier output power corresponding to the current and the pre-distortion input signal processing module according to the pre-distortion coefficient acquired predistort, and the pre- processing the input signal after the distortion of the radio frequency transmission modules transmit.

[0090] 图5为利用本发明实施例的校准方法生成校准的LUT后,MIMO终端在工作过程中的射频发射方法的流程示意图。 [0090] FIG. 5 is a rear calibrated using the calibration LUT generation method according to the embodiment of the present invention, a schematic flowchart of a MIMO radio frequency transmission method during operation of the terminal. 图6为MMO終端利用校准后的LUT通过设置在第一天线ロ的第一天线进行射频发射的工作原理示意图。 6 is a schematic view of the working principle of the terminal using the LUT after the calibration MMO transmitted by a radio frequency antenna disposed on a first of a first antenna ro. 如图6,预失真处理模块使用的预失真系数查找表LUT为经校准的校准LUT。 6, the pre-processing module predistortion coefficient lookup table LUT used in calibration LUT is calibrated. 结合图5、图6,该射频发射方法包括: In conjunction with FIG. 5, FIG. 6, the radio frequency transmission method comprising:

[0091] 步骤501,预失真处理模块根据功率放大器的输出功率,判断功率放大器是否工作在非线性区域;如是,则执行步骤502 ;否则,不对输入信号进行任何处理; [0091] Step 501, the pre-distortion power amplifier according to the output processing module determines whether the power amplifier operates in a nonlinear region; if yes, step 502 is executed; otherwise, the input signal is not subjected to any treatment;

[0092] 该步骤中,当LUT中保存的是PA的输出功率与预失真系数之间的对应关系吋,MIMO终端通过读取APC的值来获取射频发射模块的发射功率,并进而获得功率放大器PA的输出功率的值,根据该PA的输出功率可以判断出功率放大器是否工作在非线性区域,如果工作在线性区域,不对输入信号做任何处理;如果工作在非线性区域,读取APC值,并执行步骤502。 [0092] In this step, when the LUT is stored in the correspondence relationship between the output power of the PA inch of predistortion coefficients, the terminal acquires the MIMO radio frequency transmission modules transmit power APC value by reading, thus obtaining a power amplifier value of the output power of the PA, in accordance with output power of the power amplifier PA may be judged whether or not work in the nonlinear region, if the linear region, the input signal does not do any processing; if operates in a nonlinear region, reads the APC value, and step 502 is executed.

[0093] 该步骤中,当LUT中保存的为APC的值与预失真系数之间的对应关系时,可直接根据读取的APC的值来判断PA是否工作在线性区域。 [0093] In this step, when the correspondence relationship between the value of the pre-distortion coefficient stored in the LUT of APC, APC can be read directly from the value to determine whether the linear region PA.

[0094] 具体地,可预先在MMO中存储PA由线性工作区域到非线性工作区域时输出功率的门限值,当PA的输出功率大于该门限值吋,PA工作在非线性区域;同理,也可预先存PA 由线性工作区域到非线性工作区域时APC值的门限值;当PA当前的输出功率大于该门限值吋,PA工作在非线性区域。 [0094] In particular, the PA output may be stored in advance in the linear region of the MMO to the non-linear operation region when the power threshold, when the PA output power is greater than the threshold value inch, PA operates in a nonlinear region; with Li, may be prestored threshold PA APC value when the linear region of the linear operation region; PA when the output power is greater than the current threshold inch, PA operates in a nonlinear region.

[0095] 该实施例中,由于LUT中存储的通常为PA工作在非线性区域时的输出功率或APC值与预失真系数之间的对应关系,所以通常可直接通过判断当前的输出功率或APC的值是否存在于LUT中来判断PA是否工作在非线性区域,所以就可以根据获得的输出功率或根据所读取的APC值直接到预失真系数查找表中去取预失真系数,来对输入信号进行预失真。 [0095] In this embodiment, since the work is generally PA correspondence relationship stored in the LUT between the APC value when the output power or nonlinear pre-distortion coefficient of the region, it is usually determined by direct current or output power APC value exists in the LUT to determine whether PA operates in a nonlinear region, can directly to the pre-distortion coefficient obtained based on the output power of the read or APC value lookup table to fetch pre-distortion coefficient to the input signal pre-distortion.

[0096] 步骤502,预失真处理模块根据功率放大器的输出功率,从校准的预失真系数查找表中获取与功率放大器当前的输出功率相对应的预失真系数,井根据获取的预失真系数对输入预失真处理模块的基带信号进行预失真处理,并将预失真处理后的基带信号输入射频发射模块,通过数模转换、调制和放大后通过第一天线发射出去。 [0096] Step 502, the processing module in accordance with pre-distortion power amplifier output power and pre-distortion coefficient lookup table acquires the current power amplifier output power corresponding to the pre-distortion coefficient from calibration wells in accordance with the acquired pre-distortion coefficient input predistortion processing module performs the baseband signal predistortion processing, and input the baseband signal predistortion radio frequency transmission modules processed by digital to analog conversion, modulation, and transmitted out through the first antenna after amplification.

[0097] 利用该实施例的发射方法进行射频发射,可提高MIMO终端功率放大器线性度。 The method of transmitting a radio frequency transmitter of embodiment [0097] With this embodiment, the power amplifier can be improved linearity MIMO terminal.

[0098] 在具体应用中,可在MIMO終端出厂前利用本发明实施例的校准方法进行预失真系数的校准,校准后的MMO終端在工作过程中利用上述发射方法进行射频发射。 [0098] In a particular application, the calibration method may be utilized embodiment of the present invention to calibrate the predistortion coefficients in the factory before MIMO terminal, MMO terminal calibrated for the above-described transmission method using radio frequency transmission during operation.

[0099] 该步骤中,可根据读取的APC值,查找存储的预失真校准表,对发射信号进行预失真处理,获得一个与功率放大器非线性特性相反的预失真信号。 [0099] In this step, according to the APC value read predistortion lookup table stored in the calibration, transmit signal pre-distortion processing, to obtain a non-linear characteristic of the power amplifier with predistortion signal reversed.

[0100] 该步骤中,预失真处理模块的输入信号如基带信号实际上是两路信号I路信号和Q路信号,预失真处理模块将这两路信号当成复数进行处理。 [0100] In this step, the pre-distortion input signal processing module such as a baseband signal is actually two signals I signal and Q signal, predistortion processing module complex as the two signals for processing. 预失真处理模块中的矢量増益调节器根据对应的预失真系数对输入信号进行处理来调节失真曲线的形状,示例性地,如将预失真系数与输入信号相乘的预加重方法来调节失真曲线的形状,从而提供一个与功放输出相反的非线性特性。 Predistortion processing module vector zo gain regulator processes the input signals according to the corresponding pre-distortion coefficient to adjust the shape of the distortion curve, the example, as the predistortion coefficients and the input signal is multiplied by the pre-emphasis method of adjusting distortion curve shape, so as to provide a reverse characteristic to the nonlinear amplifier output.

[0101] 在功率放大器的线性区域,由于没有对信号进行任何处理,所以经过功率放大器后还是线性的;在非线性区域,经预失真处理后的信号非线性正好与功率放大器产生的非线性相互抵消,从而扩大了PA输出的线性区域,改善了射频发射机的线性度。 [0101] In the linear region of the power amplifier, since the signal is not subjected to any treatment, so after the power amplifier is linear; in the nonlinear region, the nonlinear signal by the predistorted amplifier generates exactly mutually nonlinear canceled, thereby expanding the PA output of the linear region, improves the linearity of the radio transmitter.

[0102] 以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。 [0102] The above are only preferred embodiments of the present invention, it should be noted that those of ordinary skill in the art who, without departing from the principles of the present invention, further improvements and modifications may be made, such modifications and modifications should be the scope of the present invention.

Claims (13)

1. 一种多输入多输出终端的校准装置,所述多输入多输出MIMO终端包括:第一天线口,及与所述第一天线口相连接的射频发射模块,所述射频发射模块包括功率放大器,其特征在于, 所述MIMO终端还包括: 预失真处理模块,与所述射频发射模块的输入端相连接,用于在所述MIMO终端处于工作过程中、且所述功率放大器工作在非线性区域时,在所述输入信号输入所述射频发射模块前,从预设的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述输入信号进行预失真处理;所述预失真系数查找表包括:所述功率放大器的输出功率与预失真系数之间的对应关系; 所述校准装置,用于在所述MMO终端工作前,获取校准的预失真系数查找表,包括: 第二天线口; 反馈模块,用于将所述射频发射模 A calibration apparatus MIMO terminal, the multiple input multiple output MIMO terminal comprising: a first antenna port, and a radio frequency transmission module and the first antenna port is connected to the radio frequency transmitting module including a power an amplifier, wherein the MIMO terminal further comprising: a pre-distortion processing module is connected to the input end of the RF transmission module for the terminal is in MIMO operation, and the power amplifier operating in the non- when the linear region, the input signal to the RF module prior to transmission, from a preset lookup table to obtain the pre-distortion coefficients to said pre-distortion coefficient current power amplifier output power corresponding to, and in accordance with the acquired pre-distortion coefficient of the input signal pre-distortion processing; the predistortion coefficient lookup table comprises: a correspondence relationship between the output power of the power amplifier and pre-distortion coefficient; said calibration means, for the MMO before the end of work, obtain the calibration lookup table of pre-distortion coefficient, comprising: a second antenna port; feedback module, for transmitting the analog radio frequency 输出的射频信号通过所述第一天线口反馈至所述第二天线口; 射频接收模块,用于对所述反馈至所述第二天线口的信号进行下变频及模数转换,获得所述射频发射模块输出的射频信号的数字化的反馈信号; 比较模块,用于比较所述射频接收模块输出的反馈信号与所述预失真处理模块的输入信号,并根据比较的结果确定所述功率放大器是否工作在非线性区域; 失真大小确定模块,用于在所述功率放大器工作在非线性区域时,确定所述反馈信号相对于所述预失真处理模块的输入信号的失真大小; 所述预失真处理模块,进一步用于在所述功率放大器工作在非线性区域时,根据所述失真大小确定模块确定的失真大小,调整所述预失真系数,直至得到使所述失真大小在预设失真范围内的校准预失真系数。 RF output signal is fed back to the second antenna port through the first antenna port; radio frequency receiver means for opening said second antenna signal is fed back to the down-conversion and analog-digital conversion to obtain the the digitized feedback signal is a radio frequency signal outputted from radio frequency transmission modules; comparison module for comparing the output of the RF feedback signal receiving module and the predistortion signal input processing module, and determine whether the result of the comparison amplifier operates in a nonlinear region; distortion size determination module for the power amplifier operates in the nonlinear region, the feedback signal determining the predistortion distortion the input signal processing module with respect; the predistortion processing module, the power amplifier is further configured to operate in non-linear region, the distortion according to the size determination module determines the magnitude of the distortion, adjusting the predistortion coefficients, until a magnitude of the distortion in the distortion within a predetermined range calibration predistortion coefficients.
2.根据权利要求I所述的校准装置,其特征在于,所述预失真系数查找表中的所述功率放大器的输出功率与所述预失真系数之间的对应关系为: 所述MMO终端的功率控制字APC的值与所述预失真系数之间的对应关系。 The calibration apparatus according to claim I, wherein the corresponding relationship between the pre-distortion coefficient lookup table of the power amplifier output power and the predistortion coefficient is: the terminal MMO APC power control value word with the correspondence between the pre-distortion coefficient.
3.根据权利要求I所述的校准装置,其特征在于,所述预失真系数包括:所述功率放大器的相位调节系数和增益调节系数中的至少一个。 3. The calibration apparatus as claimed in claim I, wherein said pre-distortion coefficient comprises: adjusting the phase and gain adjustment factor coefficients in at least one of the power amplifier.
4.根据权利要求I所述的校准装置,其特征在于,所述第二天线口为所述MIMO终端包含的多个天线口中,除所述第一天线口外的其它天线口;所述射频接收模块为与所述第二天线口对应的射频接收模块。 The calibration apparatus according to claim I, wherein said second antenna port to the mouth of the plurality of antennas comprises a MIMO terminal, and the other antenna ports other than said first antenna extraoral; said radio frequency receiver module and the antenna port corresponding to the RF receiving module.
5.根据权利要求1-4中任一项所述的校准装置,其特征在于, 所述反馈模块包括: 功分模块,与所述第一天线口相连接,用于将所述射频发射模块输出的射频信号分成两路相同的信号; 功率调节模块,用于接收所述两路相同信号中的一路,对所述接收的一路信号进行功率调节,并将所述调节后的信号输入所述射频接收模块; 所述两路信号中的另一路输入所述失真大小确定模块。 5. A calibration device as claimed in any one of claims 1 to 4, wherein said feedback module comprises: a power divider module, connected to said first antenna port, for the radio frequency transmission modules RF output signal into two identical signals; power regulation module, for receiving the same signal in two way, one signal of the received power adjustment, and the adjusted signal is input to the a radio frequency receiver module; the two other input signals of the distortion size determination module.
6.根据权利要求5所述的校准装置,其特征在于,所述失真大小确定模块通过分析所述反馈信号的相邻信道功率比ACPR的值,来确定所述反馈信号的失真大小。 6. The calibration apparatus according to claim 5, wherein the distortion size determination module analyzes the adjacent channel power ratio of ACPR feedback signal value to determine magnitude of the distortion of the feedback signal.
7. —种多输入多输出终端的校准方法,所述多输入多输出MIMO终端包括:第一天线口,及与所述第一天线口相连接的射频发射模块,所述射频发射模块包括功率放大器,其特征在于, 所述MIMO终端还包括: 第二天线口; 与所述第二天线口相连接的射频接收模块; 预失真处理模块,与所述射频发射模块的输入端相连接,用于在所述MIMO终端处于工作过程中、且所述功率放大器工作在非线性区域时,在所述输入信号输入所述射频发射模块前,从预设的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述输入信号进行预失真处理;所述预失真系数查找表包括:所述功率放大器的输出功率与预失真系数之间的对应关系; 所述校准方法,用于在所述MMO终端工作前对所述预失真系数查找表进行校准 7. - kind of multiple-input multiple-output terminal of the calibration method, the multiple input multiple output MIMO terminal comprising: a first antenna port, and a radio frequency transmission module and the first antenna port is connected to the radio frequency transmitting module including a power an amplifier, wherein the MIMO terminal further comprising: a second antenna port; RF receiving module and the antenna port is connected; predistortion processing module, the radio frequency transmission modules connected to the input, with the terminal is in MIMO operation, and the power amplifier operates in a nonlinear region, the input signal before the input of the radio frequency transmission modules, the lookup table acquired from a preset pre-distortion coefficient the current of the power amplifier output power corresponding to the pre-distortion coefficient, and predistorting the input signal according to the acquired pre-distortion coefficient; the predistortion coefficient look-up table comprising: the power amplifier output power and the pre- correspondence between the distortion coefficient; the calibration method for the calibration lookup table of the predistortion coefficients prior to the operation of the terminal MMO 所述校准方法包括如下步骤: 步骤A,将所述射频发射模块输出的射频信号通过所述第一天线口反馈至所述第二天线口,并通过所述射频接收模块对所述反馈至所述第二天线口的信号进行下变频和模数转换,获得所述射频发射模块的发射信号的数字化的反馈信号; 步骤B,比较所述反馈信号与所述预失真处理模块的输入信号,如果所述功率放大器工作在非线性区域,则调整所述预失真系数,直至得到使所述反馈信号相对于所述预失真处理模块的输入信号的失真大小在预设范围内的校准预失真系数,保存所述功率放大器的输出功率及与所述输出功率对应的校准预失真系数。 The calibration method comprises the following steps: Step A, the radio frequency transmission module output radio frequency signal is fed back to the second antenna port through the first antenna port, and a radio frequency receiver via the feedback module to the said second antenna port signal is downconverted and analog to digital conversion to obtain digital feedback signal of the transmission signal of the radio frequency transmission modules; step B, and comparing the feedback signal with the predistortion signal input processing module, if the power amplifier operates in a nonlinear region, the pre-distortion coefficient is adjusted until the predistortion processing module magnitude of the distortion of the input signal predistortion calibration coefficients with respect to the feedback signal is obtained within a preset range, saving the power amplifier output power and pre-distortion coefficient corresponding to the calibration of the output power.
8.根据权利要求7所述的校准方法,其特征在于,所述预失真系数查找表中的所述功率放大器的输出功率与所述预失真系数之间的对应关系为: 所述MMO终端的功率控制字APC的值与所述预失真系数之间的对应关系; 所述步骤B中,所述保存所述功率放大器的输出功率及与所述输出功率对应的校准预失真系数为: 保存与所述功率放大器的输出功率对应的功率控制字APC的值及对应的校准预失真系数。 8. The calibration method according to claim 7, wherein said pre-distortion coefficients to said pre-output correspondence relationship between the power amplifier distortion coefficient lookup table is: the terminal MMO APC power control value word with the correspondence relationship between pre-distortion coefficient; the step B, the saving of the power amplifier output power and the output power pre-distortion coefficient corresponding to the calibration of: preservation and the output power of the power amplifier and corresponding power control value corresponding to the calibration word APC pre-distortion coefficient.
9.根据权利要求7所述的校准方法,其特征在于,所述步骤B中,通过判断所述反馈信号的相邻信道功率比ACPR的值是否在预设的范围内,来确定所述反馈信号相对于所述预失真处理模块的输入信号的失真大小是否在预设的范围内。 9. The calibration method according to claim 7, wherein the step B, the adjacent channel power by determining whether the feedback signal within a predetermined range, determining the value of the feedback ratio of ACPR distortion relative to the size of the predistortion signal processing module whether an input signal within a predetermined range.
10.根据权利要求7所述的校准方法,其特征在于,所述步骤A之前还包括:将所述射频发射模块输出的射频信号分成相同的两路的步骤; 所述两路中的一路通过所述第二天线口反馈至所述射频接收模块,所述两路中的另一路用于确定所述反馈信号的失真大小。 10. A calibration method according to claim 7, wherein, prior to said step A further comprising: a radio frequency signal output by the radio frequency transmission modules is divided into two steps of the same; the path all the way through the two said second antenna port is fed back to the RF receiving module, the other of said two paths for determining the magnitude of the distortion of the feedback signal.
11.根据权利要求7-10中任一项所述的校准方法,其特征在于,所述步骤B还包括: 调整所述功率放大器的输出功率范围,以获得所述功率放大器的非线性输出功率区域内、不同输出功率点对应的校准预失真系数,并利用所述不同输出功率点对应的校准预失真系数生成校准的预失真系数查找表。 11. A calibration method according to any one of claims 7-10 claim, wherein said step B further comprising: adjusting an output power range of the power amplifier, to obtain an output power of the nonlinear amplifier region, corresponding to different power point calibration pre-distortion coefficient, and using the calibration points corresponding to the different power output of the pre-distortion coefficients generated pre-distortion coefficient calibration lookup table.
12.根据权利要求11所述的校准方法,其特征在于,通过调整所述MIMO终端的功率控制字APC的值来调整所述功率放大器的输出功率范围。 12. The calibration method as claimed in claim 11, wherein the MIMO terminal by adjusting a power control value to adjust the APC word output power range of the power amplifier.
13.根据权利要求11所述的校准方法,其特征在于,在生成所述校准的预失真系数查找表后,在所述MIMO终端的工作过程中,还包括: 步骤a,获取所述功率放大器的输出功率; 步骤b,在所述功率放大器工作在非线性区域时,所述预失真处理模块根据所述功率放大器的输出功率,从所述校准的预失真系数查找表中获取与所述功率放大器当前的输出功率相对应的预失真系数,并根据所述获取的预失真系数对所述预失真处理模块的输入信号进行预失真处理,并将所述预失真处理后的信号输入所述射频发射模块进行发射。 13. The calibration method as claimed in claim 11, wherein the lookup table generator of predistortion coefficients of the calibration during operation of the MIMO terminal, further comprising: step a, obtaining the power amplifier output power; step B, the non-linear power amplifier operating in the region, the predistortion processing module output power of the power amplifier, the lookup table to acquire power from the pre-distortion coefficient of the calibration the current amplifier output power corresponding to the pre-distortion coefficient, and the pre-distortion processing in pre-distortion input signal processing module according to the acquired pre-distortion coefficient, and the pre-distortion processing the input signal to the RF transmitting module to transmit.
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