公开(公告)号：JP2011101391A

公开(公告)日：2011-05-19

申请号：JP2010274468

申请日：2010-12-09

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： MURTHY VINAY ,  KRISHNAMOORTHI RAGHURAMAN ,  LI LINBO

IPC: H04B1/16 ,  H03G3/20 ,  H03G3/30

CPC classification number: H03G7/007 ,  H03G3/3068 ,  H03G3/3078 ,  H03G3/3089 ,  H04B1/18 ,  H04L27/2601 ,  H04L27/2614 ,  H04L27/2647

Abstract: PROBLEM TO BE SOLVED: To provide techniques for performing an automatic gain control (AGC) at a wireless receiver. SOLUTION: The total gain for a wireless receiver is achieved with discrete gain steps for analog circuitry and continuous gain for a digital variable gain amplifier (DVGA) 230. An AGC loop is updated based on power measurements for an output signal from the DVGA. A first gain for the analog circuitry is selected from multiple discrete gain values based on the AGC loop to maintain the average power of a baseband signal within a predetermined range at an analog-to-digital converter (ADC) 220 input. A second gain for the DVGA is selected based on the AGC loop to maintain the average power of the output signal at a reference power level. The first gain is switched in a manner to avoid saturation of the ADC caused by the baseband signal and to provide switching hysteresis. The AGC may be performed in log domain and with multiple modes. COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供在无线接收机处执行自动增益控制（AGC）的技术。 解决方案：通过用于模拟电路的离散增益步长和数字可变增益放大器（DVGA）230的连续增益来实现无线接收器的总增益。根据来自 DVGA。 基于AGC环路的多个离散增益值选择模拟电路的第一增益，以将基带信号的平均功率维持在模数转换器（ADC）220输入的预定范围内。 基于AGC环路选择DVGA的第二增益，以将输出信号的平均功率维持在参考功率电平。 第一增益以避免由基带信号引起的ADC饱和并提供开关滞后的方式进行切换。 AGC可以在对数域和多种模式下执行。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：JP2011097608A

公开(公告)日：2011-05-12

申请号：JP2010274469

申请日：2010-12-09

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： MURTHY VINAY ,  KRISHNAMOORTHI RAGHURAMAN ,  LI LINBO

IPC: H04B1/16 ,  H03G3/20 ,  H03G3/30

CPC classification number: H03G7/007 ,  H03G3/3068 ,  H03G3/3078 ,  H03G3/3089 ,  H04B1/18 ,  H04L27/2601 ,  H04L27/2614 ,  H04L27/2647

Abstract: PROBLEM TO BE SOLVED: To provide techniques for performing automatic gain control (AGC) at a wireless receiver.
SOLUTION: The total gain for a wireless receiver is achieved with discrete gain steps for analog circuitry and continuous gain for a digital variable gain amplifier (DVGA) 230. An AGC loop is updated based on power measurements for an output signal from the DVGA. A first gain for the analog circuitry is selected from among multiple discrete gain values based on the AGC loop to maintain the average power of a baseband signal within a predetermined range at input of an analog-to-digital converter (ADC) 220. A second gain for the DVGA is selected based on the AGC loop to maintain the average power of the output signal at a reference power level. The first gain is switched in a manner to avoid saturation of the ADC caused by the baseband signal and to provide switching hysteresis. The AGC may also be performed in log domain and with multiple modes.
COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供在无线接收机处执行自动增益控制（AGC）的技术。 解决方案：无线接收机的总增益是通过模拟电路的离散增益步长和数字可变增益放大器（DVGA）230的连续增益来实现的。AGC环路是根据来自 DVGA。 基于AGC环路从多个离散增益值中选择模拟电路的第一增益，以在模数转换器（ADC）220的输入处将基带信号的平均功率维持在预定范围内。第二增益值 基于AGC环路选择DVGA的增益以将输出信号的平均功率维持在参考功率电平。 第一增益以避免由基带信号引起的ADC饱和并提供开关滞后的方式进行切换。 AGC也可以在对数域和多种模式下执行。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：JP2011066886A

公开(公告)日：2011-03-31

申请号：JP2010204812

申请日：2010-09-13

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： CHUNG SEONG TAEK ,  GUPTA ALOK ,  LING FUYUN ,  MURTHY VINAY

IPC: H04J11/00 ,  H04J13/00

CPC classification number: H03J7/04 ,  H03J1/0083

Abstract: PROBLEM TO BE SOLVED: To provide a method for performing frequency control using dual-loop automatic frequency control (AFC). SOLUTION: A dual-loop AFC includes an inner loop that corrects short-term frequency variations due to the Doppler effect or the like, and an outer loop that corrects long-term frequency variations due to component tolerance and temperature variations. In one design, a first inner loop is performed for frequency control of a first system of a broadcast system or the like, a second inner loop is performed for frequency control of a second system of a cellular system or the like, and at least one outer loop is performed in order to adjust a reference frequency used to receive the first and second systems. Each inner loop estimates and corrects the frequency error in an input signal for associated system. Also, each inner loop may be made to be operable when receiving the system. The reference frequency may be used for frequency down conversion, sampling and/or other purposes. COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供一种使用双回路自动频率控制（AFC）进行频率控制的方法。 解决方案：双回路AFC包括内环，其校正由于多普勒效应等引起的短期频率变化，以及校正由于部件容差和温度变化引起的长期频率变化的外环。 在一种设计中，对广播系统等的第一系统进行频率控制的第一内部循环，对蜂窝系统等的第二系统进行频率控制的第二内部循环，以及至少一个 执行外部循环以便调整用于接收第一和第二系统的参考频率。 每个内循环估计并校正相关系统的输入信号中的频率误差。 此外，每个内循环可以在接收系统时可操作。 参考频率可用于降频转换，采样和/或其他目的。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：DE602006015172D1

公开(公告)日：2010-08-12

申请号：DE602006015172

申请日：2006-03-13

Applicant: QUALCOMM INC

Inventor： MURTHY VINAY ,  KRISHNAMOORTHI RAGHURAMAN ,  LI LINBO

IPC: H03G3/30

公开(公告)号：BRPI0608338A2

公开(公告)日：2009-12-01

申请号：BRPI0608338

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  KRISHNAMOORTHI RAGHURAMAN ,  VRCELJ BOJAN ,  MURTHY VINAY

IPC: H04L27/26

Abstract: A method for synchronizing timing of a receiver to a received orthogonal frequency division multiplexing (OFDM) signal is disclosed. A first timing acquisition is performed with a first received time division multiplexed (TDM) pilot to determine a course timing estimate of the received OFDM signal. A second timing acquisition is performed with a second TDM pilot to determine a fine timing estimate for a OFDM symbol of the received OFDM signal. In the second timing acquisition, the accumulated energy of channel taps over a detection window is determined and a trailing edge of the accumulated energy curve is detected. A Fourier transform (FT) collection window location for subsequent OFDM symbols is adjusted according to the trailing edge information.

公开(公告)号：AR058949A1

公开(公告)日：2008-03-05

申请号：ARP070100075

申请日：2007-01-08

Applicant: QUALCOMM INC

Inventor： CHUNG SEONG TAEK ,  MURTHY VINAY ,  TIAN TAO ,  MUKKAVILLI KRISHNA KIRAN

IPC: H04L27/26

Abstract: Métodos y aparatos para el rastreo de la frecuencia de una senal recibida. En un aspecto, se provee un método en el que la senal recibida comprende uno o más símbolos que tienen una estructura periodica. El método comprende recibir una pluralidad de muestras de un símbolo seleccionado que comprende senales piloto enmaranadas con datos y determinar un tamano de ventana y un factor de periodicidad. El método también comprende acumular una correlacion entre muestras en una primera ventana y muestras en una segunda ventana a efectos de producir un valor acumulado de correlacion, teniendo las ventanas primera y segunda un tamano y una separacion basados en el tamano de ventana y en el factor de periodicidad, respectivamente, y derivar una estimacion del error de frecuencia sobre la base del valor acumulado de la correlacion.

公开(公告)号：CA2600561A1

公开(公告)日：2006-09-21

申请号：CA2600561

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： MURTHY VINAY ,  KRISHNAMOORTHI RAGHURAMAN ,  LING FUYUN ,  VRCELJ BOJAN

IPC: H04L27/26

Abstract: A method for synchronizing timing of a receiver to a received orthogonal frequency division multiplexing (OFDM) signal is disclosed. A first timing acquisition is performed with a first received time division multiplexed (TDM) pilot to determine a course timing estimate of the received OFDM signal. A second timing acquisition is performed with a second TDM pilot to determine a fine timing estimate for a OFDM symbol of the received OFDM signal. In the second timing acquisition, the accumulated energy of channel taps over a detection window is determined and a trailing edge of the accumulated energy curve is detected. A Fourier transform (FT) collection window location for subsequent OFDM symbols is adjusted according to the trailing edge information.

公开(公告)号：AT472853T

公开(公告)日：2010-07-15

申请号：AT06738525

申请日：2006-03-13

Applicant: QUALCOMM INC

Inventor： MURTHY VINAY ,  KRISHNAMOORTHI RAGHURAMAN ,  LI LINBO

IPC: H03G3/30

Abstract: An automatic gain control loop is updated at a first update rate in an acquisition mode and at a second update rate in a tracking mode. The second update rate is slower than the first update rate.

公开(公告)号：BRPI0608285A2

公开(公告)日：2009-12-22

申请号：BRPI0608285

申请日：2006-03-13

Applicant: QUALCOMM INC

Inventor： MURTHY VINAY ,  GUPTA ALOK KUMAR

IPC: H04L27/26

Abstract: Systems and methods are provided for processing Time Domain Multiplexing (TDM) symbols via delayed correlation in the time domain. In one embodiment, a method is provided for determining synchronization information in an Orthogonal Frequency Division Multiplexing (OFDM) broadcast. The method includes employing a time domain correlation to detect the start of an OFDM super frame and utilizing the time domain correlation to synchronize a receiver to the carrier frequency of the OFDM signal.

公开(公告)号：CA2600487A1

公开(公告)日：2006-09-21

申请号：CA2600487

申请日：2006-03-13

Applicant: QUALCOMM INC

Inventor： GUPTA ALOK KUMAR ,  MURTHY VINAY

IPC: H04L27/26

Abstract: Systems and methods are provided for processing Time Domain Multiplexing (TDM) symbols via delayed correlation in the time domain. In one embodiment, a method is provided for determining synchronization information in an Orthogonal Frequency Division Multiplexing (OFDM) broadcast. The method includes employing a time domain correlation to detect the start of an OFDM super frame and utilizing the time domain correlation to synchronize a receiver to the carrier frequency of the OFDM signal.