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1. 发明专利

JP2011066886A Dual-loop automatic frequency control for wireless communication 审中-公开
标题翻译：双循环自动频率控制无线通信
公开(公告)号：JP2011066886A
公开(公告)日：2011-03-31
申请号：JP2010204812
申请日：2010-09-13
申请人： Qualcomm Inc , クゥアルコム・インコーポレイテッドQualcomm Incorporated
发明人： CHUNG SEONG TAEK , GUPTA ALOK , LING FUYUN , MURTHY VINAY
IPC分类号： H04J11/00 , H04J13/00
CPC分类号： H03J7/04 , H03J1/0083
摘要： 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
摘要翻译：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

2. 发明专利

AR058949A1 METODOS Y APARATOS PARA EL RASTREO DE LA FRECUENCIA DE UNA SENAL RECIBIDA 未知
公开(公告)号：AR058949A1
公开(公告)日：2008-03-05
申请号：ARP070100075
申请日：2007-01-08
申请人： QUALCOMM INC
发明人： CHUNG SEONG TAEK , MURTHY VINAY , TIAN TAO , MUKKAVILLI KRISHNA KIRAN
IPC分类号： H04L27/26
摘要： 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.

3. 发明专利

BRPI0606719A2 未知
公开(公告)号：BRPI0606719A2
公开(公告)日：2009-07-21
申请号：BRPI0606719
申请日：2006-01-11
申请人： QUALCOMM INC
发明人： KRISHNAMURTHI RAJEEV , CHARI MURALI RAMASWAMY , GAUTAM SHUSHEEL , VIJAYAN RAJIV , CHUNG SEONG TAEK , COLLINS BRUCE
IPC分类号： H04L27/34
摘要： A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

4. 发明专利

AT418832T 未知
公开(公告)号：AT418832T
公开(公告)日：2009-01-15
申请号：AT06718371
申请日：2006-01-11
申请人： QUALCOMM INC
发明人： LING FUYUN , CHUNG SEONG TAEK , SUN THOMAS , BAI JINXIA
IPC分类号： H04L27/34

5. 发明专利

CA2593783A1 METHODS AND APPARATUS FOR TRANSMITTING LAYERED AND NON-LAYERED DATA VIA LAYERED MODULATION 未知
公开(公告)号：CA2593783A1
公开(公告)日：2006-07-20
申请号：CA2593783
申请日：2006-01-11
申请人： QUALCOMM INC
发明人： KRISHNAMURTHI RAJEEV , COLLINS BRUCE , GAUTAM SHUSHEEL , CHARI MURALI RAMASWAMY , VIJAYAN RAJIV , CHUNG SEONG TAEK
IPC分类号： H04L27/34
摘要： A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

6. 发明专利

DE602006004427D1 未知
公开(公告)号：DE602006004427D1
公开(公告)日：2009-02-05
申请号：DE602006004427
申请日：2006-01-11
申请人： QUALCOMM INC
发明人： LING FUYUN , CHUNG SEONG TAEK , SUN THOMAS , BAI JINXIA
IPC分类号： H04L27/34

7. 发明专利

CA2602865A1 POWER SAVINGS IN HIERARCHICALLY CODED MODULATION 未知
公开(公告)号：CA2602865A1
公开(公告)日：2006-10-05
申请号：CA2602865
申请日：2006-03-31
申请人： QUALCOMM INC
发明人： WALKER KENT G , VIJAYAN RAJIV , LING FUYUN , CHARI MURALI RAMASWAMY , CHUNG SEONG TAEK
IPC分类号： H04L27/34
摘要： A wireless communication apparatus in a hierarchically coded modulation system can use error control mechanisms generated during decoding of base layer information to predict a probability of successful demodulation of enhancement layer information. Performance in the demodulation of the base layer correlates to performance in the demodulation of the enhancement layer. The receiver can determine whether to attempt demodulation of temporally correlated enhancement layer data based in part on the predicted probability of success. If the receiver determines not to demodulate the enhancement layer, the receiver can power down the enhancement layer demodulator, or otherwise minimize the power expended in the enhancement layer demodulator.

8. 发明专利

SG160381A1 AUTOMATIC FREQUENCY CONTROL FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE SUBCARRIERS 未知
公开(公告)号：SG160381A1
公开(公告)日：2010-04-29
申请号：SG2010016178
申请日：2006-03-13
申请人： QUALCOMM INC
发明人： MURTHY VINAY , GUPTA ALOK , CHUNG SEONG TAEK , LING FUYUN
摘要： Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

9. 发明专利

AR052694A1 METODOS Y APARATOS PARA TRANSMITIR DATOS EN CAPAS Y SIN CAPAS VIA MODULACION EN CAPAS 未知
公开(公告)号：AR052694A1
公开(公告)日：2007-03-28
申请号：ARP060100928
申请日：2006-03-10
申请人： QUALCOMM INC
发明人： COLLINS JOE , KRISHANMURTHI RAJEEV , MURALI RAMASWAMY , GAUTAM SHUSHEEL , VIJAYAN RAJIV , CHUNG SEONG TAEK
IPC分类号： H04L27/34
摘要： Un controlador de la capa del medio de control de acceso (MAC) puede manejar datos de la capa base y datos de la capa mejorada en un sistema de modulacion en capas. El controlador de la capa MAC puede procesar tanto los datos de la capa base como los datos de la capa mejorada y mapear los símbolos codificados en una constelacion de modulacion en capas cuando ambos están presentes. Si se terminan los datos de una delas capas, entonces el controlador de la capa MAC puede generar y suministrar datos de relleno predeterminados a la capa que carece de datos adicionales. El controlador de la capa MAC puede enviar una senal de control al hardware de capa física para hacer que el hardware mapee las senales en capas que tienen los dados de relleno en una constelacion de senal modificada. El controlador de MAC puede además generar un mensaje de encabezamiento que indica la que están los datos de relleno. El receptor puede recibir el mensaje de encabezamiento y puede usar la informacion para configurar el receptor para la constelacion de modulacion en capas o la constelacion de senal modificada

10. 发明专利

CA2600489A1 AUTOMATIC FREQUENCY CONTROL FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE SUBCARRIERS 未知
公开(公告)号：CA2600489A1
公开(公告)日：2006-09-21
申请号：CA2600489
申请日：2006-03-13
申请人： QUALCOMM INC
发明人： LING FUYUN , MURTHY VINAY , GUPTA ALOK , CHUNG SEONG TAEK
IPC分类号： H03J7/04
摘要： Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

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