公开(公告)号：WO2003065609A2

公开(公告)日：2003-08-07

申请号：PCT/US2003/002909

申请日：2003-01-31

Applicant: QUALCOMM INCORPORATED

Inventor： BLACK, Peter, J. ,  CHALLA, Raghu

IPC: H04B1/707

CPC classification number: H04B1/707 ,  H04B1/7115 ,  H04B2201/70701 ,  H04L2027/0046 ,  H04L2027/0093

Abstract: Techniques for deriving interpolated pilot symbols for a gated pilot in a wireless (e.g., IS-856, cdma2000, or W-CDMA) communication system. In one method, first and second recovered pilot symbols for first and second time instances, respectively, are initially obtained (e.g., derived based on pilot bursts for the gated pilot). A phase change induced in the received signal at a third time instance between the first and second time instances is estimated. First and second phase-rotated symbols are next derived based on the first and second recovered pilot symbols and the estimated induced phase change. Interpolated pilot symbols between the first and third time instances are then derived (e.g., using linear interpolation) based on the first recovered pilot symbol and the first phase-rotated symbol. Similarly, interpolated pilot symbols between the third and second time instances are derived based on the second phase-rotated symbol and the second recovered pilot symbol.

Abstract translation: 用于在无线（例如，IS-856，cdma2000或W-CDMA）通信系统中导出门控导频的内插导频符号的技术。 在一种方法中，分别首先获得用于第一和第二时间实例的第一和第二恢复的导频符号（例如，基于门控导频的导频突发导出）。 估计在第一和第二时间实例之间的第三时间点在接收信号中引起的相位变化。 接下来，基于第一和第二恢复导频符号和估计的诱导相位变化导出第一和第二相位旋转符号。 然后，基于第一恢复导频符号和第一相位旋转符号，导出第一和第三时间实例之间的内插导频符号（例如，使用线性插值）。 类似地，基于第二相位旋转符号和第二恢复导频符号导出第三和第二时间实例之间的内插导频符号。

公开(公告)号：WO2003052963A1

公开(公告)日：2003-06-26

申请号：PCT/US2002/040043

申请日：2002-12-12

Applicant: QUALCOMM, INCORPORATED

Inventor： BLACK, Peter J. ,  SINDHUSHAYANA, Nagabhushana ,  CHALLA, Raghu ,  ATTAR, Rashid

IPC: H04B7/00

CPC classification number: H04W52/16 ,  H04W52/08 ,  H04W52/10 ,  H04W52/26 ,  H04W52/325 ,  H04W52/36

Abstract: Systems and techniques for controlling transmission power involve receiving a first to second channel power ratio (502), receiving a first to second channel power ratio (502), adjusting the power ratio if a combined power of a plurality of channels exceeds a threshold (504), the channel as a function of the power ratio (506). It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract translation: 用于控制传输功率的系统和技术涉及接收第一至第二信道功率比（502），接收第一至第二信道功率比（502），如果多个信道的组合功率超过阈值（504），则调整功率比 ），作为功率比的函数的通道（506）。 要强调的是，提供本摘要以符合要求摘要的规则，允许搜索者或其他读者快速确定技术披露的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

公开(公告)号：WO2003009129A1

公开(公告)日：2003-01-30

申请号：PCT/US2002/022790

申请日：2002-07-16

Applicant: QUALCOMM INCORPORATED

Inventor： CHALLA, Raghu ,  KASTURI, Nitin ,  SCHLEGEL, Nikolai

IPC: G06F7/556

CPC classification number: G06F7/5235 ,  G06F1/0307 ,  G06F7/483 ,  G06F7/556

Abstract: The invention is directed toward a digital VGA that is implemented in the logarithmic domain. The digital VGA exploits logarithmic properties to replace a complex multiplier of a conventional digital VGA with a simple and inexpensive adder. Moreover, additional techniques are described to significantly reduce the size of one or more lookup tables (LUTs) implemented within the digital VGA. In this manner, the invention can realize a simple, low cost digital VGA.

Abstract translation: 本发明涉及在对数域中实现的数字VGA。 数字VGA利用对数属性来替代传统数字VGA的复数乘法器，其具有简单且便宜的加法器。 此外，描述了附加技术以显着减少在数字VGA内实现的一个或多个查找表（LUT）的大小。 以这种方式，本发明可以实现简单，低成本的数字VGA。

公开(公告)号：WO2003009128A2

公开(公告)日：2003-01-30

申请号：PCT/US2002/022820

申请日：2002-07-16

Applicant: QUALCOMM INCORPORATED

Inventor： CHALLA, Raghu ,  SINDHUSHAYANA, Nagabhushana T. ,  RAGHUPATHY, Arun

IPC: G06F7/00

CPC classification number: G06F7/5235 ,  G06F1/0356 ,  G06F2101/10

Abstract: In one embodiment, the invention is directed toward techniques for generating results in a logarithmic domain. The techniques may exploit properties of a logarithmic function to reduce the memoryrequirements needed to implement lookup tables. For example, the techniques may utilize non-uniform sampling over a logarithmic orlogarithmic-like function to reduce the number of entries needed for a given lookup table. In particular, the techniques may involve separating a number into an exponent component and a mantissa component. Each of these different components can then be converted from a first domain to a second domain using different lookup tables.

Abstract translation: 在一个实施例中，本发明涉及用于在对数域中生成结果的技术。 这些技术可以利用对数函数的属性来减少实现查找表所需的存储器要求。 例如，这些技术可以利用对数或类似于对数的函数的非均匀采样来减少给定查找表所需的条目数。 特别地，这些技术可以包括将数字分成指数分量和尾数分量。 然后可以使用不同的查找表将这些不同组件中的每一个从第一域转换为第二域。

公开(公告)号：WO2002065660A1

公开(公告)日：2002-08-22

申请号：PCT/US2002/003730

申请日：2002-02-06

Applicant: QUALCOMM INCORPORATED

Inventor： GLAZKO, Serguei, A. ,  BLACK, Peter, J. ,  CHALLA, Raghu ,  YALLAPRAGADA, Rao

IPC: H04B1/707

CPC classification number: H04B1/70758 ,  H04B2201/70701

Abstract: Techniques to search for a gated pilot reference in a wireless communication system. In one method, an overall code space in which the pilot may be found is partitioned into a number of groups of code sets, with each code set representative of all possible chip offsets of a specific PN sequence. The groups are ordered based on the likelihood of detecting the pilot in each of the groups. The groups of code sets are then used to search for the pilot, one group at a time, starting with the group most likely to result in successful pilot acquisition and ending with the group least likely to result in successful pilot acquisition. The search is terminated upon successful acquisition. The pilot search may be performed using detect, dwell, and pull-in substages. The detect substage for one group may be performed in parallel with the pull-in substage for another group.

Abstract translation: 在无线通信系统中搜索选通引导参考的技术。 在一种方法中，其中可以找到导频的总代码空间被划分成多个代码集组，其中每个代码集代表特定PN序列的所有可能的码片偏移。 基于在每个组中检测飞行员的可能性来组合组。 然后，这些代码集组用于一次搜索一组，从最有可能导致成功的飞行员获取的组开始，并以最小可能导致成功的飞行员获取结束。 搜索在成功获取后终止。 导频搜索可以使用检测，停留和拉入子站进行。 一组的检测子级可以与另一组的引入子级并行地执行。

公开(公告)号：EP3183918A1

公开(公告)日：2017-06-28

申请号：EP15747296.0

申请日：2015-07-15

Applicant: Qualcomm Incorporated

Inventor： XU, Huilin ,  GOROKHOV, Alexei ,  MOTAMED, Mariam ,  CHALLA, Raghu ,  MACDONALD, Joshua ,  XIE, Kai ,  PADI, Vivek ,  MARTEEN, Alex ,  MA, Juchuan

IPC: H04W56/00 ,  H04L27/00

CPC classification number: H04W28/0289 ,  H04L27/00 ,  H04L27/2657 ,  H04L27/2695 ,  H04L2027/0034 ,  H04L2027/0065 ,  H04W56/0035 ,  H04W76/28

Abstract: Aspects of frequency error detection with Physical Broadcast CHannel (PBCH) frequency hypothesis are described. For example, a method and apparatus are disclosed for frequency tracking in a user equipment (UE) may include detecting a change in frequency that exceeds a pull-in range of a frequency tracking loop (FTL) of the UE. The method and apparatus may also include identifying a tracking recovery frequency in response to the change in frequency being detected, wherein the tracking recover frequency is identified from a set of frequency hypotheses and based on decoding of the PBCH received by the UE. The method and apparatus may further include updating the FTL with the tracking recovery frequency.

Abstract translation: 描述了利用物理广播信道（PBCH）频率假设进行频率误差检测的各个方面。 例如，公开了用于用户设备（UE）中的频率跟踪的方法和装置可以包括检测超过UE的频率跟踪环路（FTL）的拉入范围的频率变化。 该方法和设备还可以包括响应于被检测到的频率变化来识别追踪恢复频率，其中从一组频率假设中识别追踪恢复频率并且基于由UE接收的PBCH的解码来识别追踪恢复频率。 该方法和装置可以进一步包括用追踪恢复频率来更新FTL。

公开(公告)号：EP2171954A2

公开(公告)日：2010-04-07

申请号：EP08780941.4

申请日：2008-06-23

Applicant: QUALCOMM Incorporated

Inventor： YAN, Ming ,  CHALLA, Raghu

IPC: H04L25/03

CPC classification number: H04L25/03006 ,  H04L25/03178 ,  H04L2025/03407 ,  H04L2025/0377

Abstract: Techniques are provided for suppressing interference by taking into account the possible bursty nature of co-channel interference in a communication system. In an aspect, interference levels are separately computed for first and second data portions of a desired signal. The computed interference levels may be used to scale the corresponding data portions for subsequent processing.

公开(公告)号：EP1941689A1

公开(公告)日：2008-07-09

申请号：EP06836588.1

申请日：2006-10-27

Applicant: Qualcomm Incorporated

Inventor： BREHLER, Matthias ,  CHALLA, Raghu ,  MAHAJAN, Amit ,  SIMIC, Emilija, M.

IPC: H04L27/00 ,  G01S1/00

CPC classification number: H04L27/0014 ,  G01S19/235 ,  G01S19/29 ,  H04L2027/0046 ,  H04L2027/0065

Abstract: A system, method and device for frequency acquisition. In particular, the embodiments allow for a mobile telephone to simultaneously receive data and/or voice signals while acquiring a GPS signal for its navigation feature. The system, method and device of the present embodiments employ a digital rotator and a local oscillator in concert to acquire the respective signals, correct any frequency errors associated with those signals, and maintain a local timing reference suitable for receiving and transmitting data through a mobile network while simultaneously providing an accurate location through a GPS system.

公开(公告)号：EP1488512B1

公开(公告)日：2008-07-02

申请号：EP03721474.9

申请日：2003-03-26

Applicant: QUALCOMM INCORPORATED

Inventor： BLACK, Peter J. ,  SINDHUSHAYANA, Nagabhushana ,  CHALLA, Raghu ,  SELTMANN, Kevin

IPC: H03G3/20 ,  H04B1/38

CPC classification number: H03G3/3036 ,  H03G3/3068

Abstract: Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

公开(公告)号：EP1917644A1

公开(公告)日：2008-05-07

申请号：EP06802346.4

申请日：2006-08-24

Applicant: Qualcomm Incorporated

Inventor： CHALLA, Raghu

IPC: G06T11/40

CPC classification number: G06T11/40 ,  G06T9/00 ,  G06T15/005 ,  G06T15/80

Abstract: A graphics engine includes a setup unit and a rendering unit. The setup unit computes coefficients A, B, and C used for interpolating an attribute v of a triangle to be rendered for a graphics image. The setup unit then derives compressed coefficients Ã, B, and C based on the coefficients A, B, and C. The compressed coefficients have a fixed-point format with R integer bits left of a binary point and T fractional bits right of the binary point, where R>1 and T>=0. R is selected based on the number of bits used for attribute v, T is selected based on the screen dimension, and R+T is much less than the number of bits used to represent the coefficients A, B, and C. The rendering unit performs interpolation for the attribute v using the compressed coefficients Ã, B, and C, and may be implemented with a simple (R+T)-bit non-saturating accumulator.