公开(公告)号：WO2006055797A3

公开(公告)日：2006-10-19

申请号：PCT/US2005041856

申请日：2005-11-17

Applicant: QUALCOMM INC ,  CHALLA RAGHU ,  RICK ROLAND REINHARD

Inventor： CHALLA RAGHU ,  RICK ROLAND REINHARD

IPC: H04L25/03

CPC classification number: H04L25/03006 ,  H04L25/0328

Abstract: A receiver suppresses co-channel interference (CCI) from other transmitters and intersymbol interference (ISI) due to channel distortion using "virtual" antennas. The virtual antennas may be formed by (1) oversampling a received signal for each actual antenna at the receiver and/or (1) decomposing a sequence of complex-valued samples into a sequence of inphase samples and a sequence of quadrature samples. In one design, the receiver includes a pre-processor, an interference suppressor, and an equalizer. The pre-processor processes received samples for at least one actual antenna and generates at least two sequences of input samples for each actual antenna. The interference suppressor suppresses co-channel interference in the input sample sequences and provides at least one sequence of CCI-suppressed samples. The equalizer performs detection on the CCI-suppressed sample sequence(s) and provides detected bits. The interference suppressor and equalizer may be operated for one or multiple iterations.

Abstract translation: 接收机使用“虚拟”天线抑制来自其他发射机的同信道干扰（CCI）和由于信道失真引起的符号间干扰（ISI）。 虚拟天线可以通过以下方式形成：（1）在接收机处对每个实际天线的接收信号进行过采样，和/或（1）将复数值采样序列分解为同相采样序列和正交采样序列。 在一种设计中，接收器包括预处理器，干扰抑制器和均衡器。 预处理器处理至少一个实际天线的接收样本，并为每个实际天线生成至少两个输入样本序列。 干扰抑制器抑制输入采样序列中的同信道干扰并提供至少一个CCI抑制采样序列。 均衡器对CCI抑制的采样序列执行检测并提供检测到的比特。 干扰抑制器和均衡器可以运行一次或多次迭代。

公开(公告)号：WO2009006078A3

公开(公告)日：2009-04-30

申请号：PCT/US2008067930

申请日：2008-06-23

Applicant: QUALCOMM INC ,  YAN MING ,  CHALLA RAGHU

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.

Abstract translation: 通过考虑通信系统中同信道干扰的可能突发性质，提供了用于抑制干扰的技术。 在一个方面，分别针对期望信号的第一和第二数据部分计算干扰水平。 所计算的干扰水平可以用于缩放对应的数据部分以用于随后的处理。

公开(公告)号：WO0159937A2

公开(公告)日：2001-08-16

申请号：PCT/US0102747

申请日：2001-01-26

Applicant: QUALCOMM INC

Inventor： AGRAWAL AVNEESH ,  SIH GILBERT ,  ROH MARK ,  BUTLER BRIAN ,  CHALLA RAGHU

IPC: H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04L27/00 ,  H04B1/00

CPC classification number: H04B1/7087 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L27/0014 ,  H04L2027/0032 ,  H04L2027/0057 ,  H04L2027/0087

Abstract: A novel and improved method and apparatus for frequency tracking is described. Two main sources of error that contribute to the frequency difference between locally generated carriers and those used to modulate received signals include frequency offset between the two timing sources and doppler effects due to relative movement between the sources. The present invention provides a tracking mechanism for removing the effects of error due to frequency offset as well as compensation for frequency error due to doppler in a plurality of multipath signals. Each finger (700a..700n) of a RAKE receiver utilizing the present invention will compute a frequency error for that finger. The weighted average of all of these frequency errors is calculated (710) and filtered (720) to provide a control signal for varying the frequency of IF and RF frequency synthesizers, accounting for the common frequency offset seen at each finger. Additionally, each finger is equipped with a rotator (706a...706n) for providing frequency adjustment specific to that finger. The frequency of each finger is adjusted through feedback of the frequency error finger.

Abstract translation: 描述了用于频率跟踪的新颖和改进的方法和装置。 导致本地产生的载波与用于调制接收信号的载波之间的频率差异的两个主要误差源包括两个定时源之间的频率偏移以及由于源之间的相对运动引起的多普勒效应。 本发明提供了一种用于消除由于频率偏移引起的误差的影响的跟踪机制以及由多个多径信号中的多普勒引起的频率误差的补偿。 利用本发明的RAKE接收机的每个手指（700a ... 700n）将计算该手指的频率误差。 计算所有这些频率误差的加权平均值（710）并进行滤波（720）以提供用于改变IF和RF频率合成器的频率的控制信号，从而考虑每个手指处看到的共同频率偏移。 此外，每个手指配备有用于提供特定于该手指的频率调节的旋转器（706a ... 706n）。 每个手指的频率通过频率误差手指的反馈进行调整。

公开(公告)号：EP1880234A4

公开(公告)日：2013-05-01

申请号：EP06770254

申请日：2006-05-10

Applicant: QUALCOMM INC

Inventor： SIMIC EMILIJA M ,  PATRICK CHRISTOPHER ,  CHALLA RAGHU ,  ROWITCH DOUGLAS N

IPC: H04B1/26 ,  G01S5/14 ,  G01S19/23 ,  G01S19/33 ,  G01S19/36

CPC classification number: G01S19/235 ,  H04B1/26

公开(公告)号：WO2008112928A2

公开(公告)日：2008-09-18

申请号：PCT/US2008056903

申请日：2008-03-13

Applicant: QUALCOMM INC ,  GENG JIFENG ,  CHALLA RAGHU

Inventor： GENG JIFENG ,  CHALLA RAGHU

IPC: H04L25/08

CPC classification number: H04B1/1036

Abstract: Techniques for detecting adjacent channel interference (ACI) in a wireless communication system are described. Input inphase (I) and quadrature (Q) samples are filtered with a first filter response to obtain filtered I and Q samples. The first filter response is designed to pass signal in an adjacent frequency channel while suppressing signals in a desired frequency channel and non-adjacent frequency channels. Correlations of the filtered I and Q samples are determined. The presence of ACI is detected based on the correlations of the filtered I and Q samples and the power of the input I and Q samples. If ACI is present, then whether the ACI is from a higher frequency channel or a lower frequency channel is determined based on one or more of the correlations. The input I and Q samples are filtered with a second filter response that is adjusted based on the detection of ACI.

Abstract translation: 描述了用于在无线通信系统中检测相邻信道干扰（ACI）的技术。 输入同相（I）和正交（Q）样本用第一滤波器响应进行滤波，以获得滤波的I和Q样本。 第一滤波器响应被设计为在相邻频率信道中传递信号，同时抑制期望频率信道和非相邻频率信道中的信号。 确定滤波的I和Q样品的相关性。 基于滤波I和Q采样的相关性和输入I和Q采样的功率来检测ACI的存在。 如果存在ACI，则基于一个或多个相关性来确定ACI是来自较高频率信道还是较低频率信道。 输入I和Q样本用基于ACI检测进行调整的第二滤波器响应进行滤波。

公开(公告)号：WO03030391A3

公开(公告)日：2003-08-28

申请号：PCT/US0231776

申请日：2002-10-02

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  SIH GILBERT CHRISTOPHER ,  GLAZKO SERGUEI A

IPC: H04B1/7075 ,  H04B1/708 ,  H04B1/7087 ,  H04B1/7117 ,  H04B1/707

CPC classification number: H04B1/708 ,  H04B1/70753 ,  H04B1/7087 ,  H04B1/7117 ,  H04B2201/70701 ,  H04B2201/70707

Abstract: Techniques to acquire pilots over code space and/or frequency errors. In one aspect, pilot acquisition is performed using a number of substages, and some of the substages are pipelined and performed in parallel using different processing elements. A searcher initially searches over a designated code space to find peaks, and these peaks may be re-evaluated. Finger processors then attempt to acquire the candidate peaks. The searcher may be operated to search for the next set of peaks while the finger processors process the current set of peaks. In another aspect, the full range of frequency errors for the pilots is divided into a number of frequency bins. A multi-stage scheme is used to evaluate the bins, and may employ pipelining and parallel processing such that a search for peaks in the next bin is performed while acquisition of peaks found for the current bin is attempted.

Abstract translation: 在代码空间和/或频率误差上获取导频的技术。 在一个方面，使用多个子站执行导频采集，并且使用不同的处理单元并行地执行一些子级。 搜索者最初搜索指定的代码空间以找到峰值，并且可以重新评估这些峰值。 然后，手指处理器尝试获取候选峰。 当手指处理器处理当前的峰值集合时，搜索器可以被操作以搜索下一组峰值。 在另一方面，导频的全部频率误差范围被分成多个频率仓。 使用多级方案来评估箱，并且可以采用流水线和并行处理，使得在尝试对当前箱找到的峰的采集期间执行下一箱中的峰的搜索。

公开(公告)号：WO2006122293A3

公开(公告)日：2007-12-13

申请号：PCT/US2006018375

申请日：2006-05-10

Applicant: QUALCOMM INC ,  SIMIC EMILIJA M ,  PATRICK CHRISTOPHER ,  CHALLA RAGHU ,  ROWITCH DOUGLAS N

Inventor： SIMIC EMILIJA M ,  PATRICK CHRISTOPHER ,  CHALLA RAGHU ,  ROWITCH DOUGLAS N

IPC: H04B1/26 ,  G01S5/14 ,  G01S19/23

CPC classification number: G01S19/235 ,  H04B1/26

Abstract: A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.

Abstract translation: 根据一个实施例的接收机包括：频率控制单元，被配置为接收包括发射信号的多个接收的实例的样本流。 频率控制单元被配置为输出基于多于一个接收到的实例的第一校正信号（例如指示旋转）和还基于多个接收实例中的多于一个的第二校正信号（例如，以控制振荡器） 接收的实例。 在一些实施例中，受控振荡器用于接收和/或发送另一信号，例如从GPS空中交通工具接收的信号。 在其他实施例中，所接收的实例来自GPS信号。 在另外的实施例中，使用固定频率振荡器，并且第二校正信号用于接收和/或发送诸如GPS信号的另一信号。

公开(公告)号：WO03052963A9

公开(公告)日：2004-03-18

申请号：PCT/US0240043

申请日：2002-12-12

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  SINDHUSHAYANA NAGABHUSHANA ,  CHALLA RAGHU ,  ATTAR RASHID

IPC: H04B7/005 ,  H04B7/00 ,  H04B1/00 ,  H04K1/00 ,  H04L27/30

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：WO03009128A3

公开(公告)日：2003-09-25

申请号：PCT/US0222820

申请日：2002-07-16

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  SINDHUSHAYANA NAGABHUSHANA T ,  RAGHUPATHY ARUN

IPC: G06F1/02 ,  G06F1/03 ,  G06F7/00 ,  G06F7/523 ,  G06F7/556 ,  H04B1/16 ,  H04B1/707

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，本发明针对用于在对数域中产生结果的技术。 这些技术可能会利用对数函数的属性来减少实现查找表所需的内存需求。 例如，这些技术可以利用对数或类对数函数上的非均匀采样来减少给定查找表所需的条目的数量。 具体地说，这些技术可能涉及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个组件从第一个域转换到第二个域。

公开(公告)号：WO02060144A2

公开(公告)日：2002-08-01

申请号：PCT/US0200088

申请日：2002-01-04

Applicant: QUALCOMM INC

Inventor： SIH GILBERT C ,  CHALLA RAGHU

IPC: H04L27/38 ,  H04B1/16 ,  H04L27/00

CPC classification number: H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0057 ,  H04L2027/0087

Abstract: A frequency error in the oscillation frequency of a local frequency generation loop causes a change in the baseband input signal frequency. The change in the baseband input signal frequency related to the frequency error in the local frequency generation loop can be detected as a phase rotation by the frequency error discriminator. By using the digital automatic frequency control loop, the frequency error introduced by the local frequency generation is determined with accuracy. The frequency error and corresponding control bits are entered into a calibration table. The calibration table may be use to adjust the local oscillation frequency for temperature changes, pilot frequency searching, and quick paging.

Abstract translation: 本地频率产生环路的振荡频率的频率误差导致基带输入信号频率的变化。 与本地频率产生回路中的频率误差相关的基带输入信号频率的变化可以被频率误差鉴别器检测为相位旋转。 通过使用数字自动频率控制回路，准确地确定由本地频率产生引入的频率误差。 将频率误差和相应的控制位输入校准表。 校准表可用于调整温度变化，导频搜索和快速寻呼的本地振荡频率。