公开(公告)号：EP1787398A2

公开(公告)日：2007-05-23

申请号：EP05798668.9

申请日：2005-09-08

Applicant: Navini Networks, Inc. ,  Jin, Hang ,  Grabner, John ,  Huang, Jun ,  Ho, Daniel Wee Teck

Inventor： JIN, Hang ,  GRABNER, John ,  HUANG, Jun ,  HO, Daniel, Wee, Teck.

IPC: H04B1/06 ,  H04B7/00

CPC classification number: H03G3/3052 ,  H03G2201/103 ,  H03G2201/204 ,  H03G2201/305 ,  H03G2201/706

Abstract: The present invention discloses a proactive gain control system (200) for a communications receiver. The proactive gain control system (200) includes a variable gain module (220) for outputting an output signal in response to an input signal. A detector (204) detects the output signal and outputs a detection signal representing a signal strength of the output signal. A traffic monitor (206) monitors the output signal and outputs a traffic profile signal indicating that a traffic profile for the input signal will change. A gain computing module (208) outputs a gain adjustment value in response to the detection signal and the traffic profile signal. A gain control module (210) outputs a gain control signal to the variable gain module (220), which determines a gain between the input and output signals, in response to the gain adjustment value.

公开(公告)号：EP1583247A1

公开(公告)日：2005-10-05

申请号：EP05004477.5

申请日：2005-03-01

Applicant: Broadcom Corporation

Inventor： Pan, Meng-An

IPC: H04B1/12

CPC classification number: H04B1/123 ,  H03G3/3052 ,  H03G2201/706 ,  H03J3/06

Abstract: The invention enables a compromise between DC offset rejection and image rejection through the use of a bandpass filter having a variable center frequency.

公开(公告)号：JP2006332770A

公开(公告)日：2006-12-07

申请号：JP2005149662

申请日：2005-05-23

Applicant: Alps Electric Co Ltd ,  アルプス電気株式会社

Inventor： OTAKI YUKIO ,  OYAMA TORU

IPC: H04B1/18 ,  H04B1/16 ,  H04B7/08 ,  H04N5/44 ,  H04N5/455

CPC classification number: H03G3/3068 ,  H03G2201/506 ,  H03G2201/706 ,  H04B1/18 ,  H04B7/08 ,  Y02D70/00 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/40 ,  Y02D70/444

Abstract: PROBLEM TO BE SOLVED: To reduce distortion, improve reception sensitivity, and save power by taking into consideration two conditions of reception strength and C/N at demodulation. SOLUTION: A first low noise amplifier 22 and a first reception processing section 27 are connected by a first cable 26, a bypass circuit 23 for bypassing the first low noise amplifier 22 is connected in parallel with the first low noise amplifier 22, when the strength of a terrestrial digital broadcast signal is a prescribed value E or over and the C/N is a first prescribed value C1 or over and a second prescribed value C2 or below, which is higher than the first prescribed value C1, the terrestrial digital broadcast signal is fed to the first cable 26 via the first low noise amplifier 22, and when the C/N is the first prescribed value C1 or below or the second prescribed value C2 or over, the terrestrial digital broadcast signal is not given to the first low noise amplifier 22, passes through the bypass circuit 23 and is fed to the first cable 26. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：通过考虑解调时的接收强度和C / N的两个条件，减少失真，提高接收灵敏度并节省功率。 解决方案：通过第一电缆26连接第一低噪声放大器22和第一接收处理部分27，用于旁路第一低噪声放大器22的旁路电路23与第一低噪声放大器22并联连接， 当地面数字广播信号的强度为规定值E以上且C / N为高于第一规定值C1的第一规定值C1以上且第二规定值C​​2以下时，地面 数字广播信号通过第一低噪声放大器22被馈送到第一电缆26，并且当C / N是第一规定值C1或更低或者第二规定值C​​2或以上时，地面数字广播信号不被赋予 第一低噪声放大器22通过旁路电路23并被馈送到第一电缆26.版权所有：（C）2007，JPO＆INPIT

公开(公告)号：WO2009092177A1

公开(公告)日：2009-07-30

申请号：PCT/CN2008/000145

申请日：2008-01-21

Applicant: UT斯达康通讯有限公司 ,  张晶 ,  乔嘉

Inventor： 张晶 ,  乔嘉

IPC: H04L27/38

CPC classification number: H03G3/3078 ,  H03G3/001 ,  H03G2201/706 ,  H04L27/2647

Abstract: An apparatus for realizing automatic gain control in OFDMA system is provided, the apparatus includes: the automatic gain controller, the Analog-Digital Converter and baseband processing module. A method for realizing automatic gain control in OFDMA system is provided, the method uses the following steps: measuring the Carrier to Interference-plus-Noise Ratio and the receiving power on the data burst of each uplink on a frame-by-frame basis; computing the Interference-plus-Noise power of the (n-1)th frame; obtaining the Interference-plus-Noise receiving power and the available signal receiving power of the nth frame; computing the total receiving power of the nth frame; and obtaining the needed digital AGC gain value according to the corresponding relationship between the total receiving power and the AGC gain value of the nth frame. Using the apparatus and method for realizing automatic gain control in OFDMA system, estimating the available receiving power of the current frame with the amounts of the power adjustment from the base station, the total receiving power of the current frame may be more accurately computed, and the automatic gain control can be realized through the corresponding relationship between the total receiving power and the digital AGC gain.

公开(公告)号：WO2007003049A1

公开(公告)日：2007-01-11

申请号：PCT/CA2006/001094

申请日：2006-07-04

Applicant: SIGE SEMICONDUCTOR (EUROPE) LIMITED ,  SMITH, Howard, James ,  FULGA, Stefan ,  WALLIS, Paul

Inventor： SMITH, Howard, James ,  FULGA, Stefan ,  WALLIS, Paul

IPC: G01S5/14 ,  H03G3/20 ,  H03M1/18 ,  H04Q7/32

CPC classification number: H03G3/3078 ,  G01S19/21 ,  H03G2201/706 ,  H04K3/224 ,  H04K3/90 ,  H04K2203/16

Abstract: A method and apparatus for limiting the effect of interfering transmission on a Global Positioning System (GPS) receiver is disclosed. A first mode of operation of the GPS receiver is provided wherein the AGC of the receiver is operated in a linear state. A second mode of operation of the GPS receiver is provided wherein the AGC of the receiver is operated in a non-linear state. A first signal is provided indicating a presence of a jamming signal. In response to the first signal the GPS receiver is switched from the first mode of operation to the second mode of operation.

Abstract translation: 公开了一种用于限制干扰传输对全球定位系统（GPS）接收机的影响的方法和装置。 提供了GPS接收机的第一操作模式，其中接收器的AGC以线性状态操作。 提供了一种GPS接收机的第二操作模式，其中接收机的AGC在非线性状态下操作。 提供指示存在干扰信号的第一信号。 响应于第一信号，GPS接收机从第一操作模式切换到第二操作模式。

公开(公告)号：WO2006071932A3

公开(公告)日：2007-05-03

申请号：PCT/US2005047242

申请日：2005-12-28

Applicant: MICROTUNE TEXAS LP ,  HENNIG ANDREAS

Inventor： HENNIG ANDREAS

IPC: H04B1/06 ,  H04B7/00

CPC classification number: H03G3/3068 ,  H03G2201/103 ,  H03G2201/204 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/706

Abstract: A receiver for processing a signal comprises a first amplifier circuit and a second amplifier circuit. The first amplifier circuit is operated in association with a first gain profile. The second amplifier circuit is operated in association with a second gain profile. The receiver further comprises a gain control circuit that determines a quality indicator associated with a modulated signal. The gain control circuit adjusts the first gain profile and the second gain profile based at least in part upon the determined quality indicator.

Abstract translation: 用于处理信号的接收器包括第一放大器电路和第二放大器电路。 第一放大器电路与第一增益曲线相关联地操作。 第二放大器电路与第二增益曲线相关联地操作。 接收机还包括增益控制电路，其确定与调制信号相关联的质量指示符。 增益控制电路至少部分地基于所确定的质量指示符来调整第一增益曲线和第二增益曲线。

公开(公告)号：WO2006071932A2

公开(公告)日：2006-07-06

申请号：PCT/US2005/047242

申请日：2005-12-28

Applicant: MICROTUNE (TEXAS), L.P. ,  HENNIG, Andreas

Inventor： HENNIG, Andreas

IPC: H04B1/06 ,  H04B7/00

CPC classification number: H03G3/3068 ,  H03G2201/103 ,  H03G2201/204 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/706

Abstract: A receiver for processing a signal comprises a first amplifier circuit and a second amplifier circuit. The first amplifier circuit is operated in association with a first gain profile. The second amplifier circuit is operated in association with a second gain profile. The receiver further comprises a gain control circuit that determines a quality indicator associated with a modulated signal. The gain control circuit adjusts the first gain profile and the second gain profile based at least in part upon the determined quality indicator.

Abstract translation: 用于处理信号的接收器包括第一放大器电路和第二放大器电路。 第一放大器电路与第一增益曲线相关联地操作。 第二放大器电路与第二增益曲线相关联地操作。 接收机还包括增益控制电路，其确定与调制信号相关联的质量指示符。 增益控制电路至少部分地基于所确定的质量指示符来调整第一增益曲线和第二增益曲线。

公开(公告)号：US07577414B2

公开(公告)日：2009-08-18

申请号：US11044710

申请日：2005-01-27

Applicant: Iuri Mehr

Inventor： Iuri Mehr

IPC: H04B1/06

CPC classification number: H03G3/3052 ,  H03G2201/706 ,  H04B1/26

Abstract: In one aspect, an automatic gain control (AGC) for applying a variable gain to a broadband signal is provided. The AGC comprises a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broadband signal based on a value of a gain signal to provide an amplified broadband signal, and a controller to provide the gain signal to the variable gain amplifier, the controller adapted to determine the value of the gain signal based on at least one characteristic of the amplified broadband signal. In a further aspect, the one or more characteristic is a power characteristic of the broadband signal that facilitates control of the broadband signal within a desired power range.

Abstract translation: 一方面，提供了一种用于向宽带信号施加可变增益的自动增益控制（AGC）。 AGC包括适于接收宽带信号作为输入的可变增益放大器，所述可变增益放大器被配置为基于增益信号的值向宽带信号施加可变增益以提供放大的宽带信号，以及控制器 将增益信号提供给可变增益放大器，该控制器适于基于放大的宽带信号的至少一个特性来确定增益信号的值。 在另一方面，一个或多个特征是宽带信号的功率特性，其有助于在期望的功率范围内控制宽带信号。

公开(公告)号：US07376409B2

公开(公告)日：2008-05-20

申请号：US10879588

申请日：2004-06-30

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H04B1/10

CPC classification number: H04B1/123 ,  H03G3/3052 ,  H03G2201/706 ,  H03J3/06

Abstract: The invention enables a gain adjustment in a receiver to improve signal quality by varying resistance of an input resistor array of a bandpass filter, the array having a plurality of resistors in series with switches that out of the path of the current when the resistors are in use.

Abstract translation: 本发明使接收机中的增益调整能够通过改变带通滤波器的输入电阻阵列的电阻来改善信号质量，该阵列具有与当电阻器处于电流时电流路径之外的开关串联的多个电阻器 使用。

公开(公告)号：US07274322B2

公开(公告)日：2007-09-25

申请号：US11161163

申请日：2005-07-25

Applicant: Jeffrey A. Hester ,  Radde Majeed ,  Julia R. Baryl

Inventor： Jeffrey A. Hester ,  Radde Majeed ,  Julia R. Baryl

IPC: G01S7/34

CPC classification number: H03G3/3078 ,  G01S7/34 ,  G01S7/4021 ,  H03G3/001 ,  H03G2201/706 ,  Y10S73/90

Abstract: Apparatus and methods for performing automatic gain control in a radar system. One embodiment of the system includes an attenuator that controls gain of signals received from a radar receiver. A digital signal processor determines coarse gain correction based on digitized noise data for a plurality of channels, determines fine gain correction based on the residual error after the coarse gain, and determines frequency vs. gain curve correction based on the digitized noise data for a plurality of channels and a mathematical model of frequency gain across a noise spectrum for the radar system. The result of the processor is a gain control signal that is sent to the attenuator to perform hardware gain control and a channel specific scale factor for software gain control. In one embodiment, the processor generates the gain control signal during an inactive scan mode of the radar system.

Abstract translation: 在雷达系统中执行自动增益控制的装置和方法。 该系统的一个实施例包括衰减器，其控制从雷达接收器接收的信号的增益。 数字信号处理器基于多个通道的数字化噪声数据来确定粗增益校正，基于粗增益之后的残差来确定精细增益校正，并且基于多个数字化噪声数据确定频率对增益曲线校正 的通道和用于雷达系统的噪声频谱的频率增益的数学模型。 处理器的结果是发送到衰减器以执行硬件增益控制和用于软件增益控制的通道特定比例因子的增益控制信号。 在一个实施例中，处理器在雷达系统的非活动扫描模式期间产生增益控制信号。