公开(公告)号：AU2003297874A1

公开(公告)日：2004-06-30

申请号：AU2003297874

申请日：2003-12-09

Applicant: QUALCOMM INC

Inventor： KINDRED DANIEL R ,  LEVIN JEFFREY A ,  SUNDARESAN RAJESH

IPC: H04B1/707

公开(公告)号：CA2509194A1

公开(公告)日：2004-06-24

申请号：CA2509194

申请日：2003-12-09

Applicant: QUALCOMM INC

Inventor： LEVIN JEFFREY A ,  SUNDARESAN RAJESH ,  KINDRED DANIEL R

IPC: H04B1/707

Abstract: Techniques for performing finger merge protection (FMP) using polling. Whenever a command to adjust the timing of a designated finger is received, other fingers "on the same channel" (i.e., those for which merge protection is sought) are polled for permission to apply the command. The designated finge r sets a poll request and provides other pertinent information to an FMP stora ge unit. Thereafter, each of the other fingers on the same channel determines whether or not applying the command would result in that finger merging with the designated finger. Merging may be detected if the difference between the timing (or offsets) of the two fingers is less than a specified offset spacing. Any finger on the same channel may disallow the command if merging is detected. The designated finger would then adjust its timing if the command is not disallowed by any of the fingers on the same channel.

公开(公告)号：WO2007106876A3

公开(公告)日：2009-05-14

申请号：PCT/US2007064014

申请日：2007-03-14

Applicant: QUALCOMM INC ,  SIDI JONATHAN ,  SUNDARESAN RAJESH

Inventor： SIDI JONATHAN ,  SUNDARESAN RAJESH

IPC: H04L25/06

CPC classification number: H03M13/2957 ,  H03M13/256 ,  H03M13/258 ,  H03M13/6325 ,  H04L25/067 ,  H04L27/38

Abstract: Techniques for efficiently and accurately computing log-likelihood ratio (LLRs) for code bits are described. A set of code bits may be mapped to a modulation symbol in a signal constellation. Different code bits in the set may be associated with different LLR functions. A receiver obtains received symbols for a transmission sent via a communication channel. The receiver derives LLRs for code bits based on the received symbols and piecewise linear approximation of at least one LLR function. The piecewise linear approximation of each LLR function may comprise one or more linear functions for one or more ranges of input values. The receiver may select one of the linear functions for each code bit based on a corresponding received symbol component value. The receiver may then derive an LLR for each code bit based on the linear function selected for that first code bit.

Abstract translation: 描述了用于有效和准确地计算码位的对数似然比（LLR）的技术。 一组码位可以映射到信号星座中的调制符号。 集合中的不同码位可能与不同的LLR功能相关联。 接收机获得经由通信信道发送的传输的接收符号。 接收机基于所接收的符号和至少一个LLR功能的分段线性近似，导出用于码位的LLR。 每个LLR函数的分段线性近似可以包括用于一个或多个输入值范围的一个或多个线性函数。 接收机可以基于相应的接收到的符号分量值为每个码位选择一个线性函数。 然后，接收机可以基于为该第一码位选择的线性函数导出每个码位的LLR。

公开(公告)号：WO02060139A3

公开(公告)日：2002-10-03

申请号：PCT/US0202141

申请日：2002-01-23

Applicant: QUALCOMM INC

Inventor： SENDONARIS ANDREW ,  SUNDARESAN RAJESH

IPC: H04L25/02

CPC classification number: H04L25/0236

Abstract: Techniques for incorporating non-pilot symbols along with pilot symbols to improve the estimate of the characteristics (e.g. amplitude and phase) of a communication link. A pilot filter weighs samples corresponding to pilot and non-pilot symbol by different sets of coefficients, which have values determined by and/or corresponding to the confidence in the detected sample. Samples corresponding to pilot symbols are typically associated with higher degree of confidence and are weighted more (e.g., with weights of 1.0). Samples corresponding to non-pilot symbols are typically associated with lower confidence and are weighted with values that may be variable and dependent on the degree of confidence in the samples (e.g., with weights ranging from 0.0 up to 1.0). The weights are updated based on a particular estimator such as a MAP (Maximum a Posteriori) estimator, a MLE (Maximum Likelihood Estimator), or some other estimator.

Abstract translation: 用于将非导频码元与导频码元一起并入以改进通信链路的特性（例如幅度和相位）的估计的技术。 导频滤波器通过不同的系数组来加权对应于导频和非导频码元的样本，所述不同的系数组具有由所检测的样本中的置信度确定的和/或对应于该置信度的值。 对应于导频符号的样本通常与更高置信度相关联并且被加权得更多（例如，具有1.0的权重）。 对应于非导频符号的样本通常与较低的置信度相关联，并且用可能是可变的并且取决于样本中的置信度（例如，具有范围从0.0至1.0的权重）的值来加权。 基于特定估计器（例如MAP（最大后验概率）估计器，MLE（最大似然估计器）或某个其他估计器）来更新权重。

公开(公告)号：WO2007059517A2

公开(公告)日：2007-05-24

申请号：PCT/US2006060947

申请日：2006-11-15

Applicant: QUALCOMM INC ,  MERGEN GOKHAN ,  SUBRAHMANYA PARVATHANATHAN ,  KASTURI NITIN ,  SUNDARESAN RAJESH

Inventor： MERGEN GOKHAN ,  SUBRAHMANYA PARVATHANATHAN ,  KASTURI NITIN ,  SUNDARESAN RAJESH

CPC classification number: H04B7/0634 ,  H04B7/0848 ,  H04L7/0058 ,  H04L25/03044

Abstract: Techniques for performing equalization at a receiver are described. In an aspect, equalization is performed by sub-sampling an over-sampled input signal to obtain multiple sub-sampled signals. An over-sampled channel impulse response estimate is derived and sub-sampled to obtain multiple sub-sampled channel impulse response estimates. At least one set of equalizer coefficients is derived based on at least one sub-sampled channel impulse response estimate. At least one sub-sampled signal is filtered with the at least one set of equalizer coefficients to obtain at least one output signal. One sub-sampled signal (e.g., with largest energy) may be selected and equalized based on a set of equalizer coefficients derived from an associated sub-sampled channel impulse response estimate. Alternatively, the multiple sub-sampled signals may be equalized based on multiple sets of equalizer coefficients, which may be derived separately or jointly. The equalizer coefficients may be derived in the time domain or frequency domain.

Abstract translation: 描述用于在接收机处执行均衡的技术。 在一方面，通过对过采样输入信号进行子采样来执行均衡以获得多个子采样信号。 导出过采样信道脉冲响应估计并进行子采样以获得多个子采样信道脉冲响应估计。 基于至少一个子采样信道脉冲响应估计导出至少一组均衡器系数。 用至少一组均衡器系数对至少一个子采样信号进行滤波以获得至少一个输出信号。 可以基于从相关联的子采样信道脉冲响应估计导出的一组均衡器系数来选择和均衡一个子采样信号（例如，具有最大能量）。 或者，可以基于可以单独或联合导出的多组均衡器系数来均衡多个子采样信号。 均衡器系数可以在时域或频域中导出。

公开(公告)号：WO03003586A2

公开(公告)日：2003-01-09

申请号：PCT/US0220345

申请日：2002-06-26

Applicant: QUALCOMM INC

Inventor： SHIU DA-SHAN ,  SUNDARESAN RAJESH

IPC: H03M13/09 ,  H03M13/29 ,  H03M13/39 ,  H03M13/45 ,  H04L1/00

CPC classification number: H03M13/3905 ,  H03M13/2957 ,  H03M13/2975 ,  H03M13/3707 ,  H03M13/3776 ,  H03M13/3911 ,  H03M13/6337 ,  H03M13/6577 ,  H03M13/658

Abstract: Techniques to improve the performance of a Turbo decoder when scale information for the bits in a code segment to be decoded is not known. A number of hypotheses are formed for the code segment, with each hypothesis corresponding to a particular set of one or more values for a set of one or more parameters used for decoding the code segment. For the MAP decoding scheme, these parameters may be for the sequence of scaling factors used to scale the bits prior to decoding and/or a scale used to evaluate a (e.g., min*) function for the MAP decoding. The code segment is decoded based on the MAP decoding scheme and in accordance with each hypothesis. The quality of the decoded result for each hypothesis is determined based on one or more performance metrics. The decoded bits for the best hypothesis are provided as the Turbo decoder output.

Abstract translation: 当要解码的代码段中的比特的缩放信息未知时，用于改善Turbo解码器的性能的技术。 针对代码段形成多个假设，其中每个假设对应于用于对代码段进行解码的一个或多个参数的集合的一个或多个值的特定集合。 对于MAP解码方案，这些参数可以是用于在解码之前缩放位的缩放因子序列和/或用于评估MAP解码的（例如，min *）函数的缩放。 代码段基于MAP解码方案并根据每个假设进行解码。 基于一个或多个性能度量来确定每个假设的解码结果的质量。 提供最佳假设的解码比特作为Turbo解码器输出。