公开(公告)号：BR0313597A

公开(公告)日：2005-10-18

申请号：BR0313597

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN E ,  HOWARD MICHAEL A

IPC: H04L27/38 ,  H04B3/06 ,  H04B7/005 ,  H04L25/03 ,  H04L27/22

Abstract: Method for optimizing an equalizer at a receiver in a communication system by training virtual parallel equalizers. Multiple configurations are applied for training an equalizer, and a performance measurement or estimate determined. The performance measures of the multiple configurations are compared to determine the optimum configuration. The training and selection are performed at a rate sufficiently higher than the received sample rate as to allow optimization in between processing of data samples.

公开(公告)号：BR0306895A

公开(公告)日：2004-12-14

申请号：BR0306895

申请日：2003-01-07

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN E

IPC: H03M13/01 ,  H04B1/7105 ,  H04B1/712 ,  H04L1/00 ,  H04L1/02

Abstract: Methods and apparatus are presented herein for determining log likelihood ratios (LLRs) for code symbols. Pilot and code symbols are transmitted over diversity channels, which can be modeled as a slowly time varying system. A formulation for a multipath gain vector is derived herein based on the slowly time varying model. The multipath gain vector is then solved using iterative procedures. Using the solved multipath gain vector, the LLRs for code symbols are computed.

公开(公告)号：NO20042344A

公开(公告)日：2004-07-28

申请号：NO20042344

申请日：2004-06-07

Applicant: QUALCOMM INC

Inventor： SMEE JOHN E ,  JAYARAMAN SRIKANT ,  FERNANDEZ-CORBATON IVAN JESUS

IPC: H03D7/00 ,  H03D1/00 ,  H03J7/04 ,  H04B1/26 ,  H04B1/707 ,  H04L27/00 ,  H03D7/16

CPC classification number: H04L27/0014 ,  H03J7/04 ,  H04B1/707 ,  H04L2027/0028 ,  H04L2027/0055 ,  H04L2027/0067 ,  H04L2027/0095

公开(公告)号：NO20042343L

公开(公告)日：2004-07-23

申请号：NO20042343

申请日：2004-06-07

Applicant: QUALCOMM INC

Inventor： SMEE JOHN E ,  JAYARAMAN SRIKANT ,  FERNANDEZ-CORBATON IVAN JESUS

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

Abstract: Techniques for detecting and mitigating adjacent channel interference (ACI) in a wireless (e.g., CDMA) communication system. In one aspect, ACI may be determined by signaling or detected by filtering a pre-processed signal in each frequency range where ACI may be present (e.g., with a respective bandpass filter), estimating the energy of the filtered signal for each frequency range, comparing the estimated energy against an ACI threshold, and indicating the presence or absence of ACI at each frequency range based on the result of the comparison. In another aspect, a selectable filter (e.g., a FIR filter) having a number of possible filter responses (e.g., provided by a number of sets of filter coefficients) may be used to provide filtering for the pre-processed signal and to reject any detected ACI. One of the possible filter responses is selected for use depending on whether and where ACI has been detected.

公开(公告)号：CA2491732A1

公开(公告)日：2004-02-05

申请号：CA2491732

申请日：2003-07-18

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN E

IPC: H04B1/707 ,  H04L25/02 ,  H04L25/03

Abstract: A non-parametric matched filter receiver that includes a digital (e.g., FIR) filter and a channel estimator. The channel estimator (1) determines the timing to center the digital filter, (2) obtains the characteristics of the noise in received samples, (3) estimates the system response for the samples using a best linear unbiased (BLU) estimator, a correlating estimator, or so me other type of estimator, and (4) derives a set of coefficients for the digit al filter based on the estimated system response and the determined noise characteristics. The correlating estimator correlates the samples with their known values to obtain the estimated system response. The BLU estimator pre- processes the samples to whiten the noise, correlates the whitened samples with their known values, and applies a correction factor to obtain the estimated system response. The digital filter then filters the samples with the set of coefficients to provide demodulated symbols.

公开(公告)号：WO2014200747A3

公开(公告)日：2015-02-12

申请号：PCT/US2014040478

申请日：2014-06-02

Applicant: QUALCOMM INC

Inventor： NAMGOONG JUNE ,  JAYARAMAN SRIKANT

IPC: G01S5/02

CPC classification number: G01S3/04 ,  G01S5/0226

Abstract: Methods, systems, devices, and apparatuses are described for location tracking in which each tag used to track an asset or person in an indoor environment transmits ranging waveforms used to estimate a location of the tag. Multiple tags may concurrently transmit without interfering with each other by having each tag use a distinct frequency shift for the ranging waveforms. Access points may be deployed throughout the indoor environment as part of a wireless network (e.g., ultra-wideband or UWB network) that tracks the assets. The access points may receive the ranging waveforms transmitted by the tags and may perform measurements based on the ranging waveforms. The measurements may be sent to a tracking management server to estimate the location of the tags. The server may also determine and assign the distinct frequency shifts used by the tags and may modify the assignment when the number of tags being tracked changes.

Abstract translation: 描述用于位置跟踪的方法，系统，设备和装置，其中用于跟踪室内环境中的资产或人员的每个标签传输用于估计标签位置的测距波形。 通过使每个标签对测距波形使用不同的频移，多个标签可以同时发送而不干扰彼此。 接入点可以在整个室内环境中部署，作为跟踪资产的无线网络（例如，超宽带或UWB网络）的一部分。 接入点可以接收由标签发送的测距波形，并且可以基于测距波形执行测量。 测量可以发送到跟踪管理服务器以估计标签的位置。 服务器还可以确定并分配标签使用的不同频率偏移，并且当跟踪的标签的数量改变时可以修改分配。

公开(公告)号：WO2008014520A3

公开(公告)日：2008-03-20

申请号：PCT/US2007074767

申请日：2007-07-30

Applicant: QUALCOMM INC ,  KUPPUSWAMY KALYAN ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT ,  JALALI AHMAD

Inventor： KUPPUSWAMY KALYAN ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT ,  JALALI AHMAD

IPC: H04L29/06 ,  H04B7/185

CPC classification number: H04B7/18567

Abstract: A communication system is provided that allows a mobile terminal with an EVDO interface to perform VoIP communications via a satellite. The 1xEVDO physical layer frames and vocoder frames are synchronized and aligned to a known periodic time boundary for efficient transmission. A reverse link transmission rate is adjusted to match a VoIP packet source rate and operate the reverse link transmission channel to a satellite continuously. The reverse link transmission channel from a mobile terminal to a satellite may operate continuously and at a lower channel transmission rate to reduce the peak power amplifier power requirement. The higher layer time-out periods are increased to account for propagation delay to/from a satellite relay. A physical layer retransmit mechanism is disabled to ignore ACKs/ NACKs when sending VoIP packets via a satellite relay. A different channel code may be selective applied depending on the size/type of packets being transmitted.

Abstract translation: 提供一种通信系统，其允许具有EVDO接口的移动终端经由卫星执行VoIP通信。 1xEVDO物理层帧和声码器帧被同步并对齐到已知的周期时间边界以进行有效传输。 调整反向链路传输速率以匹配VoIP分组源速率并且连续地向卫星操作反向链路传输信道。 从移动终端到卫星的反向链路传输信道可以连续地以较低的信道传输速率工作，以降低峰值功率放大器的功率需求。 更高层的超时周期被增加以考虑到/从卫星中继的传播延迟。 当通过卫星中继发送VoIP分组时，物理层重传机制被禁止忽略ACK / NACK。 根据发送的分组的大小/类型，可以选择性地应用不同的信道码。

公开(公告)号：ZA201603335B

公开(公告)日：2019-04-24

申请号：ZA201603335

申请日：2016-05-17

Applicant: QUALCOMM INC

Inventor： LIN YIH-HAO ,  LIU RUOHENG ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT

公开(公告)号：CL2016001438A1

公开(公告)日：2017-02-10

申请号：CL2016001438

申请日：2016-06-10

Applicant: QUALCOMM INC

Inventor： LIN YIH-HAO ,  LIU RUOHENG ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT

IPC: H04B7/185 ,  H04L5/00 ,  H04W84/04 ,  H04W88/04

Abstract: EL APARATO DE ENTIDAD DE GESTION DE CONEXION DETERMINE UN CONJUNTO DE MODEMS DENTRO DE LA COBERTURA DE UN AREA PARTICULAR, CADA MODEM DEL CONJUNTO DE MODEMS ESTA ASOCIADO CON UNA AERONAVE PARTICULAR Y UNA PORTADORA DE UNA PLURALIDAD DE PORTADORAS, EL APARATO ASIGNA SUBCONJUNTOS DE MODEMS A CADA eNB DE UN CONJUNTO DE eNBS, LA ASIGNACION PERMITE QUE CADA eNB PUEDA COMUNICARSE CON EL SUBCONJUNTO DE MODEMS ASIGNADO, CADA eNB OPERA SOBRE UNA PORTADORA DIFERENTE, EL APARATO PUEDE SER UN eNB, EL eNB DETERMINA UN CONJUNTO DE MODEMS DENTRO DE LA COBERTURA DEL eNB, EL CONJUNTO DE MODEMS ESTA ASOCIADO CON UNA PORTADORA DE UNA PLURALIDAD DE PORTADORAS, EL eNB OPERA SOBRE DICHA PORTADORA, CADA MODEM EN EL CONJUNTO DE MODEMS SE ASOCIA CON UNA AERONAVE DIFERENTE, EL eNB ENVIA INFORMACION QUE INDICA EL CONJUNTO DE MODEMS Y RECIBE UNA ASIGNACION DE UN SEGUNDO CONJUNTO DE MODEMS EN RESPUESTA A LA INFORMACION ENVIADA.

公开(公告)号：ES2541104T3

公开(公告)日：2015-07-16

申请号：ES07100721

申请日：2005-01-20

Applicant: QUALCOMM INC

Inventor： GROB MATTHEW S ,  BLACK PETER J ,  JAYARAMAN SRIKANT ,  JACOBS PAUL E

IPC: H04B7/26 ,  H04L5/02 ,  H04L27/26

Abstract: Un método para recibir difusiones, que comprende: recibir, mediante un receptor, una primera transmisión (100) que comprende una pluralidad de ranuras de tiempo; identificar que la primera transmisión incluye una porción (178) de difusión modulada usando un primer formato de modulación y una porción (175) de unidifusión modulada usando un segundo formato de modulación, en el que los formatos primero y segundo de modulación son diferentes; demodular (545) la porción de unidifusión; y demodular (540) la porción de difusión; caracterizado porque: la porción (178) de difusión y la porción (175) de unidifusión son porciones separadas de tiempo de la primera transmisión, que ocupan, cada una, una o más ranuras separadas de tiempo de la primera transmisión; y la porción (178) de difusión es una porción sincronizada de difusión, transmitida por una pluralidad de transmisores sincronizados que usan una misma forma de onda de difusión.