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公开(公告)号：US08937993B2
公开(公告)日：2015-01-20
申请号：US13897119
申请日：2013-05-17
Applicant: Scintera Networks LLC
Inventor： Qian Yu , Yan Wang , Rajeev Krishnamoorthy
CPC classification number: H04L27/2624
Abstract: A crest factor reduction (CFR) circuit reduces the peak-to-average (PAR) power of a digitally modulated signal in a complex baseband is achieved by post-processing the input signal, with negligible increase in out-of-band emissions. The CFR circuit takes advantage of a procedure that solves for an optimum CFR using a constraint-optimization approach. In one embodiment, the CFR circuit, which receives an input signal and provides an output signal, includes: (a) an error generation circuit that receives the input signal and provides an error signal representative of a measure of circuit-induced distortion and a delayed input signal, the delayed input signal being the input signal delayed by a predetermined value; (b) a linear-phase filter receiving the error signal to provide a correction signal; and (c) a summer that subtracts the correction from the delayed input signal to provide the output signal. This circuit can achieve near optimal CFR for arbitrary multi-carrier signals without incurring high computational complexity.
Abstract translation: 峰值因数降低（CFR）电路降低了复数基带中的数字调制信号的峰均比（PAR）功率，通过对输入信号进行后处理，带外发射的增加可以忽略不计。 CFR电路利用了使用约束优化方法解决最佳CFR的过程。 在一个实施例中，接收输入信号并提供输出信号的CFR电路包括：（a）误差产生电路，其接收输入信号并提供代表电路引起的失真的测量的误差信号和延迟的 输入信号，延迟输入信号是延迟预定值的输入信号; （b）接收误差信号以提供校正信号的线性相位滤波器; 和（c）从延迟的输入信号中减去校正以提供输出信号的加法器。 该电路可以实现任意多载波信号的接近最佳CFR，而不会导致高计算复杂度。
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公开(公告)号：US08805304B2
公开(公告)日：2014-08-12
申请号：US13343631
申请日：2012-01-04
Applicant: Qian Yu , Rajeev Krishnamoorthy , Olivier Charlon
Inventor： Qian Yu , Rajeev Krishnamoorthy , Olivier Charlon
IPC: H04B1/04
CPC classification number: H03F1/3258 , H03F3/195 , H03F3/245 , H03F3/45376 , H03F3/45892 , H03F2200/336 , H03F2203/45394 , H03F2203/45562 , H03F2203/45614 , H03F2203/45616
Abstract: An RF linearizer and an associated method are provided for linearizing a power amplifier. The RF linearizer may include: (a) a quadrature up-converter for up-converting a baseband input signal that is to be transmitted by the power amplifier; (b) an RF analog predistorter controlled by a set of coefficients for predistorting the up-converted input signal; (c) a down-converter for down-converting an output signal of the power amplifier; (d) an error monitor receiving the down-converted output signal and the input signal for providing an error signal; and (e) a signal analyzer receiving the error signal, the signal analyzer using an out-of-band power spectrum of the error signal to optimize the set of coefficients. The input signal may have an in-phase component and a quadrature component.
Abstract translation: 提供RF线性化器和相关联的方法用于线性化功率放大器。 RF线性化器可以包括：（a）用于上变频由功率放大器发送的基带输入信号的正交上变频器; （b）由一组系数控制的RF模拟预失真器，用于预失真上变频的输入信号; （c）用于对功率放大器的输出信号进行下变频的下变频器; （d）误差监视器，接收所述下变频输出信号和所述输入信号以提供误差信号; 以及（e）信号分析仪，其接收误差信号，所述信号分析仪使用所述误差信号的带外功率谱来优化所述系数集合。 输入信号可以具有同相分量和正交分量。
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公开(公告)号：US09124225B2
公开(公告)日：2015-09-01
申请号：US14192488
申请日：2014-02-27
Applicant: Scintera Networks LLC
Inventor： Olivier Charlon , Frédéric Roger , Michael Chapman
CPC classification number: H03F1/3258 , H03F3/189 , H03F3/24 , H03F3/68 , H03F2200/451
Abstract: A circuit in a transmitter with multiple power amplifiers includes multiple individual linearizer circuits each receiving a corresponding input signal and each providing a conditioned input signal to a corresponding power amplifier. The linearizer circuit each include: (a) a pre-distortion circuit receiving (i) the corresponding input signal and (ii) the output signal of a corresponding power amplifier, and providing a pre-distortion signal; (b) a cancelation circuit receiving an interfering signal and providing a cancelation signal; and (c) a combination circuit that combines the cancelation signal and the pre-distortion signal to provide a conditioned input signal to the corresponding power amplifier.
Abstract translation: 具有多个功率放大器的发射机中的电路包括多个单独的线性化电路，每个线性化电路接收相应的输入信号，并且每个提供经过调节的输入信号到相应的功率放大器。 线性化电路各自包括：（a）预失真电路，其接收（i）对应的输入信号和（ii）相应的功率放大器的输出信号，并提供预失真信号; （b）消除电路，接收干扰信号并提供取消信号; 和（c）组合电路，其组合消除信号和预失真信号，以向相应的功率放大器提供经调节的输入信号。
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4.发明授权Adaptively controlled digital pre-distortion in an RF power amplifier using an integrated signal analyzer with enhanced analog-to-digital conversion 有权使用具有增强型模数转换的集成信号分析仪在RF功率放大器中进行自适应控制的数字预失真公开(公告)号：US09209841B2
公开(公告)日：2015-12-08
申请号：US14166422
申请日：2014-01-28
Applicant: Scintera Networks, Inc.
Inventor： Qian Yu , Yan Wang , Rajeev Krishnamoorthy
CPC classification number: H04B1/0475 , H03F1/02 , H03F1/3241 , H03F3/24 , H04B2001/0425 , H04B2001/0441 , H04B2001/045
Abstract: A pre-distortion circuit for a power amplifier may include: (a) a digital interface for receiving a complex-value digital baseband signal; (b) a mixed-signal pre-distortion circuit adaptively controlled by a set of parameter values, receiving the complex-value digital baseband signal to provide a pre-distorted signal for input to the power amplifier, the mixed-signal pre-distortion circuit may include: (i) digital pre-distortion circuit that transforms the complex-value digital baseband signal to a pre-distorted complex-value digital baseband signal by applying to the complex-value digital baseband signal a memory-less non-linear gain and a polynomial function based on the complex-value digital baseband signal one or more delayed copies of the complex-value digital baseband signal; and (ii) up-converter that converts the pre-distorted complex-value digital baseband signal to the pre-distorted signal; and (c) a signal analyzer receiving an output signal from the power amplifier to provide the parameter values from time to time to the mixed-signal pre-distortion circuit.
Abstract translation: 用于功率放大器的预失真电路可以包括：（a）用于接收复数值数字基带信号的数字接口; （b）由一组参数值自适应控制的混合信号预失真电路，接收复数值数字基带信号以提供用于输入到功率放大器的预失真信号，混合信号预失真电路 可以包括：（i）数字预失真电路，其通过向复数值数字基带信号施加无内存的非线性增益来将复数值数字基带信号转换为预失真的复数值数字基带信号，以及 基于复值数字基带信号的多值函数复数值数字基带信号的一个或多个延迟副本; 和（ii）将预失真复数值数字基带信号转换为预失真信号的上变频器; 以及（c）信号分析器，接收来自功率放大器的输出信号，以将参数值不时地提供给混合信号预失真电路。
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5.发明授权Linearization of power amplifiers through digital in-band predistortion followed by analog predistortion 有权通过数字带内预失真跟随模拟预失真来对功率放大器进行线性化公开(公告)号：US08903338B2
公开(公告)日：2014-12-02
申请号：US14012849
申请日：2013-08-28
Applicant: Scintera Networks LLC
Inventor： Qian Yu
CPC classification number: H03F1/3241 , H03F1/3247 , H03F2200/321 , H04L25/03343
Abstract: A system for implementing linearization of a radio frequency (RF) power amplifier (PA) in a base station, as well as various component circuitry for implementing said system. By means of a smart partitioning of the signal processing for predistortion between the analog domain and the digital domain, a more linear relationship between the digital input data and the output RF signal is achieved. Linearization of the PA's output signal is obtained using a mixed-signal apparatus. The digital baseband signal enters the RF signal source. The RF signal source comprises an in-band predistortion circuit, a micro-controller and digital modulator. The output of the digital modulator is an RF signal that enters the PA module. The PA module is composed of the PA and the RF power amplifier linearizer (RFPAL). The RFPAL comprises an RF predistortion circuit, and RF signal analyzer and a microcontroller. In addition, a backward data interface connects the RF signal source with the RFPAL.
Abstract translation: 一种用于实现基站中的射频（RF）功率放大器（PA）的线性化的系统，以及用于实现所述系统的各种组件电路。 通过对模拟域和数字域之间的预失真进行信号处理的智能划分，实现了数字输入数据与输出RF信号之间更为线性的关系。 使用混合信号装置获得PA输出信号的线性化。 数字基带信号进入RF信号源。 RF信号源包括带内预失真电路，微控制器和数字调制器。 数字调制器的输出是进入PA模块的RF信号。 PA模块由PA和RF功率放大器线性化（RFPAL）组成。 RFPAL包括RF预失真电路，RF信号分析器和微控制器。 此外，反向数据接口将RF信号源与RFPAL连接。
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Patent Agency Ranking
6.发明授权公开(公告)号：US09461697B2
公开(公告)日：2016-10-04
申请号：US14192513
申请日：2014-02-27
Applicant: Scintera Networks LLC
Inventor： Qian Yu , Yan Wang , Olivier Charlon , Rajeev Krishnamoorthy
Abstract: A transceiver coupled to an antenna includes: (a) a multi-port filter having a bidirectional port coupled to the antenna, at least one input port and at least one output port; (b) a transmit datapath receiving a transmission signal and providing the transmission signal for transmission by the antenna through the multi-port filter, the transmit datapath being coupled to the input port of the multi-port filter; (c) a receive datapath receiving a reception signal from the antenna, the receive datapath being coupled to the output port of the multi-port filter; (d) a band-pass filter coupled to the antenna for receiving a sampled signal that includes intermodulation components between two or more of an external signal, the transmission signal and the reception signal; and (e) a monitoring and cancellation circuit receiving the transmission signal, the reception signal and the sampled signal to cancel the intermodulation components.
Abstract translation: 耦合到天线的收发器包括：（a）具有耦合到天线的双向端口，至少一个输入端口和至少一个输出端口的多端口滤波器; （b）发送数据路径，接收发送信号并提供发送信号以供天线通过多端口滤波器进行发送，发送数据路径耦合到多端口滤波器的输入端口; （c）从天线接收接收信号的接收数据路径，接收数据路径耦合到多端口滤波器的输出端口; （d）耦合到所述天线的带通滤波器，用于接收包括外部信号，所述发送信号和所述接收信号中的两个或更多个之间的互调分量的采样信号; 和（e）接收发送信号的监视和取消电路，接收信号和采样信号以消除互调分量。
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7.发明授权Integrated signal analyzer for adaptive control of mixed-signal integrated circuits 有权用于混合信号集成电路自适应控制的集成信号分析仪公开(公告)号：US09093959B2
公开(公告)日：2015-07-28
申请号：US14021478
申请日：2013-09-09
Applicant: Scintera Networks LLC
Inventor： Qian Yu , Abhijit Shanbhag , Yan Wang
CPC classification number: H03F1/3241 , H03F1/3247 , H04B17/13
Abstract: A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to analyze RF signals. The signal analyzer may comprise at least one multiplexor for selecting selected RF signals for comparison and analysis, and may comprise a digital signal processor (DSP) for analyzing the selected RF signals and adjusting at least one operational parameter of the digital controlled analog sub-system responsive to the analysis.
Abstract translation: 混合信号自适应集成电路可以包括与主要功能电路协作连接的主要功能电路，数字控制的模拟子系统和片上信号分析器。 片上信号分析器可以被布置成分析RF信号。 信号分析器可以包括用于选择用于比较和分析的所选RF信号的至少一个多路复用器，并且可以包括用于分析所选择的RF信号并调整数字受控模拟子系统的至少一个操作参数的数字信号处理器（DSP） 响应分析。
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公开(公告)号：US09628120B2
公开(公告)日：2017-04-18
申请号：US14961295
申请日：2015-12-07
Applicant: Scintera Networks LLC
Inventor： Qian Yu , Yan Wang , Rajeev Krishnamoorthy
CPC classification number: H04B1/0475 , H03F1/02 , H03F1/3241 , H03F3/24 , H04B2001/0425 , H04B2001/0441 , H04B2001/045
Abstract: A system includes a crest-factor reduction circuit, a signal analyzer, and a pre-distortion circuit. The crest-factor reduction circuit reduces a crest factor of a baseband signal and generates a feedforward signal. The signal analyzer generates parameters based on the feedforward signal and an output signal from a power amplifier. The pre-distortion circuit generates a pre-distorted baseband signal based on the parameters for input to the power amplifier.
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公开(公告)号：US09306618B2
公开(公告)日：2016-04-05
申请号：US14028266
申请日：2013-09-16
Applicant: Scintera Networks LLC
Inventor： Olivier Charlon , Qian Yu
IPC: H04B1/525
CPC classification number: H04B1/525
Abstract: A filter enhancer provides greater performance in a passive filter. The passive filter has an input terminal for receiving a signal in a first frequency band and an output terminal for providing a signal in a second frequency band. The filter enhancer includes: (a) a first canceller circuit coupled between input terminal and output terminal, the first canceller circuit including a first finite impulse response (FIR) filter for attenuating signals in the first frequency band; and (b) a control circuit coupled to output terminal and first canceller circuit for providing adaptive coefficients for configuring the first FIR filter. The first FIR filter may be implemented by either a digital FIR filter or an analog FIR filter. The filter enhancer may further include a second canceller circuit coupled between input terminal and output terminal, the second canceller circuit including a second FIR filter for attenuating signals in the second frequency band.
Abstract translation: 滤波器增强器在无源滤波器中提供更高的性能。 无源滤波器具有用于接收第一频带中的信号的输入端和用于在第二频带中提供信号的输出端。 滤波器增强器包括：（a）耦合在输入端和输出端之间的第一消除电路，第一消除电路包括用于衰减第一频带信号的第一有限脉冲响应（FIR）滤波器; 和（b）耦合到输出端子和第一消除器电路的控制电路，用于提供用于配置第一FIR滤波器的自适应系数。 第一FIR滤波器可以由数字FIR滤波器或模拟FIR滤波器来实现。 滤波器增强器还可以包括耦合在输入端子和输出端子之间的第二消除器电路，第二消除器电路包括用于衰减第二频带中的信号的第二FIR滤波器。
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公开(公告)号：US09077299B2
公开(公告)日：2015-07-07
申请号：US13954497
申请日：2013-07-30
Applicant: Scintera Networks LLC
Inventor： Kelly Davidson Hawkes
CPC classification number: H03F1/3247 , H03F1/3294 , H03F2200/192 , H03F2200/195 , H03F2200/204 , H03F2200/207 , H03F2200/228
Abstract: An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number of sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter.
Abstract translation: 一种装置和方法选择并使用RF功率放大器线性化器的参数值来预失真功率放大器的输入信号，从而在功率放大器中实现线性输出响应。 该装置和方法从多个参数值集合中选择每一组对应于功率放大器的不同输出功率范围的参数值。 该组参数包括针对该组的特定输出功率范围量身定制的系数向量。 功率放大器输入功率以不同的时间间隔重复测量和滤波。 输入功率测量可以通过快速攻击/慢衰减滤波器来滤波，该滤波器跟随滤波器的快速攻击部分操作的测量的峰值，并且在滤波器的缓慢衰减部分的操作期间提供低的方差。
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