公开(公告)号：US20100273427A1

公开(公告)日：2010-10-28

申请号：US12712907

申请日：2010-02-25

Applicant: Gokhan Mergen ,  Paravathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

Inventor： Gokhan Mergen ,  Paravathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

IPC: H04B15/00

CPC classification number: H04L25/025 ,  H04B17/3913 ,  H04B2201/70701 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03038

Abstract: Techniques for filtering noisy estimates to reduce estimation errors are described. A sequence of input values (e.g., for an initial channel impulse response estimate (CIRE)) is filtered with an infinite impulse response (IIR) filter having at least one coefficient to obtain a sequence of output values (e.g., for a filtered CIRE). The coefficient(s) are updated based on the sequence of input values with an adaptive filter, a bank of prediction filters, or a normalized variation technique. To update the coefficient(s) with the adaptive filter, a sequence of predicted values is derived based on the sequence of input values. Prediction errors between the sequence of predicted values and the sequence of input values are determined and filtered to obtain filtered prediction errors. The coefficient(s) of the IIR filter are then updated based on the prediction errors and the filtered prediction errors.

公开(公告)号：US07319852B2

公开(公告)日：2008-01-15

申请号：US10233364

申请日：2002-08-29

Applicant: Nikolai Schlegel ,  Christian Holenstein ,  Daniel Filipovic ,  Nitin Kasturi

Inventor： Nikolai Schlegel ,  Christian Holenstein ,  Daniel Filipovic ,  Nitin Kasturi

IPC: H04B1/26

CPC classification number: H04L25/063 ,  H03D3/008 ,  H04B1/30

Abstract: An apparatus for coarse compensation of a direct current (DC) offset in a direct to baseband receiver architecture utilizes a serial analog to digital converter (ADC), such as a Delta-Sigma converter, to convert the received signal to digital form. The output of the ADC is sampled for a predetermined number of samples and a counter coupled to the ADC is incremented each time the sample generated by the ADC is a logic one. The counter is not incremented if the sample from the ADC is a logic zero. After the predetermined number of samples is obtained, the counter value is indicative of the DC offset in the received signal. The counter value may be converted by a code converter to a correction value for easy operation of a digital to analog converter (DAC). If the number of samples from the ADC is a power of two, the code converted may be readily implemented by simply inverting the most significant bit (MSB) from the counter to thereby generate a twos complement version of the counter value. The correction value is coupled to the DAC to generate a compensation signal, which is provided to the received signal path in the form of a feedback signal to compensate for the DC offset.

Abstract translation: 用于直接到基带接收机架构中的直流（DC）偏移的粗略补偿的装置利用诸如Δ-Σ转换器的串行模数转换器（ADC）将接收的信号转换成数字形式。 对于预定数量的采样，ADC的输出被采样，并且每当由ADC产生的采样为逻辑1时，耦合到ADC的计数器递增。 如果来自ADC的采样为逻辑0，则计数器不递增。 在获得预定数量的样本之后，计数器值表示接收信号中的直流偏移。 计数器值可以由代码转换器转换成用于容易操作数模转换器（DAC）的校正值。 如果来自ADC的采样数是2的幂，则通过简单地将来自计数器的最高有效位（MSB）反相，从而生成计数器值的二进制补码版本，可以容易地实现转换代码。 校正值耦合到DAC以产生补偿信号，其以反馈信号的形式提供给接收信号路径以补偿DC偏移。

公开(公告)号：US08879514B2

公开(公告)日：2014-11-04

申请号：US13619157

申请日：2012-09-14

Applicant: Sharad Deepak Sambhwani ,  Sony J. Akkarakaran ,  Nitin Kasturi ,  Shashank V. Maiya ,  Wei Zhang ,  Prashant Udupa Sripathi

Inventor： Sharad Deepak Sambhwani ,  Sony J. Akkarakaran ,  Nitin Kasturi ,  Shashank V. Maiya ,  Wei Zhang ,  Prashant Udupa Sripathi

IPC: H04B7/216 ,  H04W52/02

CPC classification number: H04W52/0238 ,  Y02D70/1224 ,  Y02D70/1226 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/1246 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/25

Abstract: Apparatus and methods for wireless communication that includes measuring energy on a first path metric and second path metric, comparing the energy on the first path metric and second path metric to a predetermined threshold and determining if Dedicated Control Channel (DCCH) energy is present.

Abstract translation: 用于无线通信的设备和方法包括测量第一路径度量和第二路径度量上的能量，将第一路径度量和第二路径度量上的能量与预定阈值进行比较，并确定是否存在专用控制信道（DCCH）能量。

公开(公告)号：US07012911B2

公开(公告)日：2006-03-14

申请号：US09871563

申请日：2001-05-31

Applicant: Nitin Kasturi ,  Rajat Rajinderkumar Dhawan ,  Daisuke Terasawa ,  Avneesh Agrawal ,  Arak Sutivong

Inventor： Nitin Kasturi ,  Rajat Rajinderkumar Dhawan ,  Daisuke Terasawa ,  Avneesh Agrawal ,  Arak Sutivong

IPC: H04B7/20 ,  H04J3/02 ,  H04Q7/00

CPC classification number: H04L1/0071 ,  H04J13/00 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/08

Abstract: Techniques for efficient W-CDMA modulation are disclosed. In one aspect, a multiplexing/coding chain for use in modulation such as that defined by the W-CDMA specification is disclosed. In another aspect, transport blocks are processed and concatenated, utilizing memory efficiently. This aspect has the further benefit of preparing transport channels for efficient subsequent processing. It also allows for ease of interface with the transport channel source. In another aspect, the use of repeated channel coding is used in lieu of an interleaver memory to provide channel coding and interleaving. These aspects, collectively, yield the advanced benefits of a system, such as W-CDMA, in a hardware efficient manner. The techniques described herein apply equally to both access points and access terminals. The techniques are not limited to W-CDMA systems; they are quite suitable to other systems requiring the various benefits the invention offers. Various other aspects of the invention are also presented.

公开(公告)号：US08873515B2

公开(公告)日：2014-10-28

申请号：US13439736

申请日：2012-04-04

Applicant: Nitin Kasturi ,  Vidyut M. Naware ,  Ketan N. Patel

Inventor： Nitin Kasturi ,  Vidyut M. Naware ,  Ketan N. Patel

IPC: H04W4/00 ,  H04B7/08

CPC classification number: H04B7/0871 ,  H04B7/0814 ,  H04B7/0842

Abstract: Dynamically control of receive diversity switching in a user equipment (UE) is disclosed. By dynamically controlling the switching between enabling and disabling the receive diversity, power consumption in UEs, such as smart phones and other mobile devices may be reduced. Control is based, at least in part, on measurements for data activity performed by the UE. When the UE finds measurements that would suggest data activity, the UE will switch to enable a receive diversity state when conditions are available for the switch. Similarly, when the UE finds measurements that would suggest data inactivity, the UE will switch to disable the receive diversity state when conditions are available for the switch.

Abstract translation: 公开了用户设备（UE）中的接收分集交换的动态控制。 通过动态地控制启用和禁用接收分集之间的切换，可以减少诸如智能电话和其他移动设备的UE中的功率消耗。 控制至少部分地基于由UE执行的数据活动的测量。 当UE发现将提示数据活动的测量值时，当条件可用于交换机时，UE将切换到启用接收分集状态。 类似地，当UE发现建议数据不活动的测量时，当条件可用于交换机时，UE将切换为禁用接收分集状态。

公开(公告)号：US08521113B2

公开(公告)日：2013-08-27

申请号：US12109436

申请日：2008-04-25

Applicant: Gokhan Mergen ,  Manini S. Shah ,  Nathaniel Lev Grossman ,  Nitin Kasturi ,  Yan Li

Inventor： Gokhan Mergen ,  Manini S. Shah ,  Nathaniel Lev Grossman ,  Nitin Kasturi ,  Yan Li

IPC: H04B17/00

CPC classification number: H04L1/20 ,  H04L1/0026

Abstract: Disclosed are methods and apparatus for predicting a channel quality indicator in a communication system, and in particular a delayed receiver. A disclosed method for determining the predictive channel quality indicator for a delayed receiver includes determining at least one channel quality indicator from a non-delayed receiver. The method also includes determining another channel quality indicator from the delayed receiver, and then calculating the predictive channel quality indicator for the delayed receiver through a function of the channel quality indicators from the non-delayed receiver and the channel quality indicator from the delayed receiver. Corresponding apparatus are also disclosed.

Abstract translation: 公开了用于预测通信系统中的信道质量指示符的方法和装置，特别是延迟的接收机。 用于确定延迟接收机的预测信道质量指示符的公开方法包括从非延迟接收机确定至少一个信道质量指示符。 该方法还包括从延迟的接收机确定另一信道质量指示符，然后通过来自非延迟接收机的信道质量指示符和来自延迟接收机的信道质量指示符的函数来计算延迟接收机的预测信道质量指示符。 还公开了相应的装置。

公开(公告)号：US20070110200A1

公开(公告)日：2007-05-17

申请号：US11399891

申请日：2006-04-07

Applicant: Gokhan Mergen ,  Parvathananthan Subrahmanya ,  Nitin Kasturi ,  Rajesh Sundaresan

Inventor： Gokhan Mergen ,  Parvathananthan Subrahmanya ,  Nitin Kasturi ,  Rajesh Sundaresan

IPC: H04B1/10

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：US06600792B2

公开(公告)日：2003-07-29

申请号：US09105532

申请日：1998-06-26

Applicant: Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

Inventor： Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

IPC: H04L2549

CPC classification number: H03F1/3247 ,  H03F1/3241 ,  H03F2201/3233

Abstract: A predistortion technique for high power amplifiers includes an adaptive predistortion algorithm that operates independently of data samples to write a set of complex gain values, or predistortion parameters, to a lookup table. The algorithm may be processor-driven. The gain values are taken from the lookup table and multiplied by a complex digital baseband waveform. The gain values may first be subjected to interpolation. The downconverted output of the amplifier is measured to gauge the efficacy of the predistortion. Based on the effect of the predistortion upon the ratio of in-band power to out-of-band power, decisions are made on the set of predistortion parameters for the next iteration of the algorithm. The algorithm runs continuously, perturbing parameters and adapting the predistortion functions accordingly in an effort to continually reflect instantaneous amplitude-modulation and phase-modulation relationships that may change over time with temperature variation or component aging.

Abstract translation: 用于高功率放大器的预失真技术包括自适应预失真算法，其独立于数据样本操作以将一组复增益值或预失真参数写入查找表。 算法可能是处理器驱动的。 增益值取自查表，并乘以复数数字基带波形。 增益值可以首先进行插值。 测量放大器的下变频输出以测量预失真的功效。 基于预失真对带内功率与带外功率之比的影响，决定了该算法下一次迭代的预失真参数集。 该算法连续运行，扰动参数并相应地调整预失真函数，以努力连续反映随着温度变化或分量老化而随时间变化的瞬时幅度调制和相位调制关系。