公开(公告)号：HK1071481A1

公开(公告)日：2005-07-15

申请号：HK05104586

申请日：2005-05-31

Applicant: QUALCOMM INC

Inventor： KAN ANDREW ,  PATEL SHIMMAN

IPC: H04B20060101 ,  H04B1/00 ,  H04B1/10 ,  H04B1/707

公开(公告)号：BR0307367A

公开(公告)日：2005-04-26

申请号：BR0307367

申请日：2003-01-31

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  ROH MARK CHARLES ,  PATEL SHIMMAN

IPC: H04B1/707 ,  H04L27/00

Abstract: Techniques to acquire the frequency of a signal instance based on a window of data samples covering a time period shorter than the time needed to achieve frequency lock. The window of data samples is initially captured and stored to a sample buffer. A segment of data samples is then retrieved from the sample buffer for processing. The retrieved data samples are rotated by a current frequency error estimate to provide frequency-translated data samples, which are further processed to provide one or more pilot symbols. An updated frequency error estimate for the frequency-translated data samples is then derived based on the pilot symbols using a frequency control loop. The window of data samples is processed for a number of iterations until frequency acquisition is achieved for the signal instance or termination is reached. For each iteration, one segment is processed at a time and typically in sequential order.

公开(公告)号：AU2003297901A1

公开(公告)日：2004-06-30

申请号：AU2003297901

申请日：2003-12-10

Applicant: QUALCOMM INC

Inventor： CHEN QINGXIN ,  PATEL SHIMMAN

IPC: H04W24/02 ,  H04L1/00 ,  H04L1/20 ,  H04Q7/38

Abstract: Techniques to detect for DTX frames in a "primary" transmission that may be sent in a non-continuous manner using a "secondary" transmission that is sent during periods of no transmission for the primary transmission. The primary and secondary transmissions may be the ones sent on the F-DCCH and Forward Power Control Subchannel, respectively, in an IS-2000 system. In one method, a determination is first made whether or not a frame received for the primary transmission in a particular frame interval is a good frame (e.g., based on CRC). If the received frame is not a good frame, then a determination is next made whether the received frame is a DTX frame or an erased frame based on a number of metrics determined for the primary and secondary transmissions. The metrics may include symbol error rate of the received frame, secondary transmission (e.g., PC bit) energy, and received frame energy.

公开(公告)号：AU2002248333A1

公开(公告)日：2002-08-12

申请号：AU2002248333

申请日：2002-01-11

Applicant: QUALCOMM INC

Inventor： RICK ROLAND ,  SUBRAHMANYA PARVATHANATHAN ,  BUTLER BRIAN ,  PATEL SHIMMAN ,  EKVETCHAVAT THUNACHATE

IPC: H04B7/06 ,  H04B7/08 ,  H04B1/707

Abstract: In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

公开(公告)号：CA2437399A1

公开(公告)日：2002-08-08

申请号：CA2437399

申请日：2002-01-31

Applicant: QUALCOMM INC

Inventor： WILBORN THOMAS BRIAN ,  SIH GILBERT C ,  PATEL SHIMMAN ,  ABRISHAMKAR FARROKH

IPC: G01S11/02 ,  G01S19/25 ,  G01S19/26

Abstract: A velocityx estimate is determined from a recevied signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelop e valures are used to calculate a running RMS value. A level crossing threshol d is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted . The number of level crossings is mapped to a velocity estimate.

公开(公告)号：NO20021002L

公开(公告)日：2002-03-15

申请号：NO20021002

申请日：2002-02-28

Applicant: QUALCOMM INC

Inventor： CHEN TAO ,  PATEL SHIMMAN

IPC: H04B7/005 ,  H03M13/45 ,  H04L1/00 ,  H04L1/20 ,  H04L27/30 ,  H04W52/26

Abstract: Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received frame, a quality metric is computed and compared against a threshold value. The threshold value is selected based, in part, on the quality metrics of received frames. Based on the comparison result, the received frame is indicated as being either transmitted and received in error (i.e., erased or bad) or not transmitted at all (i.e., zero rate or empty). The quality metric can relate to an energy of a received frame, a distance between a received frame and a codeword corresponding to the received frame, or other metrics. The threshold value can be selected based on the quality metrics computed for decoded frames or received frames identified as good, and can be dynamically adjusted based on current information available at the receiver. The method is advantageously used in a CDMA communications system.

公开(公告)号：NO20021002D0

公开(公告)日：2002-02-28

申请号：NO20021002

申请日：2002-02-28

Applicant: QUALCOMM INC

Inventor： CHEN TAO ,  PATEL SHIMMAN

IPC: H04B7/005 ,  H03M13/45 ,  H04L1/00 ,  H04L1/20 ,  H04L27/30 ,  H04W52/26 ,  H04L

Abstract: Techniques for detecting zero rate frames in a received data transmission. A modulated signal is received and demodulated in accordance with a particular demodulation format to generate demodulated symbols. The demodulated symbols are partitioned into a number of received frames. For each received frame, a quality metric is computed and compared against a threshold value. The threshold value is selected based, in part, on the quality metrics of received frames. Based on the comparison result, the received frame is indicated as being either transmitted and received in error (i.e., erased or bad) or not transmitted at all (i.e., zero rate or empty). The quality metric can relate to an energy of a received frame, a distance between a received frame and a codeword corresponding to the received frame, or other metrics. The threshold value can be selected based on the quality metrics computed for decoded frames or received frames identified as good, and can be dynamically adjusted based on current information available at the receiver. The method is advantageously used in a CDMA communications system.

公开(公告)号：ES2908943T3

公开(公告)日：2022-05-04

申请号：ES17826356

申请日：2017-12-12

Applicant: QUALCOMM INC

Inventor： HOSSEINI SEYEDKIANOUSH ,  CHEN WANSHI ,  SUN JING ,  RICO ALVARINO ALBERTO ,  PATEL SHIMMAN

IPC: H04L5/00 ,  H04L27/26 ,  H04W72/04 ,  H04W88/08

Abstract: Un procedimiento (2100) para la comunicación inalámbrica, que comprende: identificar (2105) un conjunto de intervalos de tiempo de transmisión acortados, sTTI (615, 620, 625, 630, 635, 640), para las transmisiones de enlace ascendente de un primer servicio inalámbrico, el conjunto de sTTI (615, 620, 625, 630, 635, 640) se ubica dentro de los límites de tiempo de la subtrama de una subtrama (600) de un segundo servicio inalámbrico; identificar (2110) dos o más sTTI (615, 640) dentro del conjunto de sTTI (615, 620, 625, 630, 635, 640) para la transmisión de las transmisiones de la señal de referencia de sondeo, SRS, dentro de los límites de tiempo de la subtrama; y transmitir (2125) una o más transmisiones de SRS en al menos uno de los dos o más sTTI (615, 640), el procedimiento que comprende además identificar (2115) un primer subconjunto (620, 625, 630, 635) del conjunto de sTTI cada uno que abarca dos símbolos de multiplexación por división de frecuencia ortogonal, OFDM, y un segundo subconjunto (615, 640) del conjunto de sTTI cada uno que abarca tres símbolos de OFDM; y configurar (2120) dos o más sTTI del segundo subconjunto (615, 640) para la una o más transmisiones de SRS, en el que identificar (2115) el segundo subconjunto comprende: identificar un primer sTTI de tres símbolos (615) como un sTTI inicial de una primera ranura dentro de los límites de tiempo de la subtrama; identificar un segundo sTTI de tres símbolos (640) como un sTTI final de una segunda ranura dentro de los límites de tiempo de la subtrama; e identificar un primer símbolo de la SRS (645-a) dentro del primer sTTI de tres símbolos (615) para una primera transmisión de SRS y un segundo símbolo de la SRS (645-b) dentro del segundo sTTI de tres símbolos (640) para una segunda transmisión de SRS, en el que el segundo símbolo de la SRS (645-b) de una primera subtrama (600) es adyacente al primer símbolo de la SRS de una subtrama subsecuente.

公开(公告)号：AU2017240364B2

公开(公告)日：2021-12-23

申请号：AU2017240364

申请日：2017-03-01

Applicant: QUALCOMM INC

Inventor： RICO ALVARINO ALBERTO ,  CHEN WANSHI ,  PATEL SHIMMAN ,  GRIOT MIGUEL

IPC: H04W48/16 ,  H04W4/90

Abstract: Standalone MBSFN cells may provide an improved user experience for an individual with a non-legacy UE since the bandwidth of that cell is mostly allocated to broadcasting streaming services. However, an individual with a legacy UE may be able to detect cell acquisition information associated with a standalone MBSFN cell but not to acquire standalone MBSFN cells. In order to solve this problem, the present disclosure provides various UE avoidance schemes that enable non-legacy UEs to acquire a standalone MBSFN cell and prevents legacy UEs from trying to acquire a standalone MBSFN only cell. The apparatus may receive cell acquisition information associated with an eMBMS standalone cell. The apparatus may detect a UE avoidance scheme based on a characteristic associated with the cell acquisition information. The apparatus may perform cell acquisition with the eMBMS standalone cell based on the characteristic.

公开(公告)号：ES2872523T3

公开(公告)日：2021-11-02

申请号：ES15775916

申请日：2015-09-28

Applicant: QUALCOMM INC

Inventor： GAAL PETER ,  YERRAMALLI SRINIVAS ,  MALLADI DURGA ,  BHUSHAN NAGA ,  WEI YONGBIN ,  LUO TAO ,  XU HAO ,  CHEN WANSHI ,  PATEL SHIMMAN ,  DAMNJANOVIC ALEKSANDAR ,  ZHANG XIAOXIA

IPC: H04W74/08 ,  H04L5/00 ,  H04W16/14

Abstract: Un método (2200) de comunicación inalámbrica, que comprende: ganar (2205), por un equipo de usuario (115), UE, una contienda por el acceso a una banda de espectro de radiofrecuencia sin licencia; y transmitir (2210), por el UE (115), una porción de una primera señal de baliza de uso de canal (955), CUBS, con una primera forma de onda y al menos una porción de una segunda CUBS (960) con una segunda forma de onda a lo largo de la banda de espectro de radiofrecuencia sin licencia, transmitiéndose la porción de la primera CUBS (955) y la al menos una porción de la segunda CUBS (960) en un número de entrelazados de frecuencia de la banda de espectro de radiofrecuencia sin licencia, en donde la forma de onda de la primera CUBS (955) es diferente de la forma de onda de la segunda CUBS (960), en donde la transmisión tiene lugar durante un preámbulo que comprende un período fraccionario (975) de un primer período de símbolo (935) y un segundo período de símbolo (940) a continuación del primer período de símbolo (935), y en donde la transmisión comprende: transmitir (905) una porción inicial (950) de la primera CUBS (955) durante el período fraccionario (975) del primer período de símbolo (935), o alinear en el tiempo la primera CUBS (955) con el primer período de símbolo (935) y transmitir (910) una porción final (965) de la primera CUBS alineada en el tiempo durante el período fraccionario (975) del primer período de símbolo (935); y transmitir (905; 910) la segunda CUBS (960) durante el segundo período de símbolo (940).