公开(公告)号：US08934522B2

公开(公告)日：2015-01-13

申请号：US13481439

申请日：2012-05-25

申请人： Sunil Chomal ,  Karthik Ramasubramanian ,  Jawaharlal Tangudu ,  Hemanth Mullur

发明人： Sunil Chomal ,  Karthik Ramasubramanian ,  Jawaharlal Tangudu ,  Hemanth Mullur

IPC分类号： H04B1/00

CPC分类号： H04B1/709 ,  H04B1/7075 ,  H04B2201/70715

摘要： An integrated circuit for facilitating spread spectrum reception of data having a data bit period includes an hypothesis search circuit (120, 210, 220) operable to correlate a pseudorandom code with a signal input based on a received signal to produce correlation results, and a processor circuit (320) operable to coherently integrate the correlation results over plural sample windows (PreD1, PreD2) staggered relative to each other in the coherent integration interval and to non-coherently combine the coherently integrated results corresponding to the plural sample windows (PreD1, PreD2) to produce a received signal output, whereby enhancing performance. Other circuits, receivers and processes are also disclosed.

摘要翻译： 一种用于促进具有数据位周期的数据的扩频接收的集成电路包括可操作以将伪随机码与基于接收信号输入的信号相关联以产生相关结果的假设检索电路（120,210,220），以及处理器 电路（320）可操作以将相关结果相干地整合在相干积分间隔中相对于彼此交错的多个样本窗口（PreD1，PreD2），并且非相干地组合对应于多个样本窗口的相干整合结果（PreD1，PreD2 ）以产生接收信号输出，从而提高性能。 还公开了其他电路，接收器和处理。

公开(公告)号：US08847819B2

公开(公告)日：2014-09-30

申请号：US13280524

申请日：2011-10-25

申请人： Karthik Ramasubramanian ,  Jawaharlal Tangudu

发明人： Karthik Ramasubramanian ,  Jawaharlal Tangudu

IPC分类号： G01S19/23

CPC分类号： G01S19/23

摘要： Navigation system receiver, and test circuits and methods for determining drift profile of a receiver clock in the navigation system receiver are disclosed. In an embodiment, the navigation system receiver includes a clock source configured to generate a receiver clock for the navigation system receiver and a test circuit. The test circuit is configured to facilitate determination of a drift profile associated with the receiver clock based on detection and tracking of a test signal received by the test circuit, where the test signal comprises at least one continuous wave (CW) signal.

摘要翻译： 导航系统接收机，以及用于确定导航系统接收机中的接收机时钟的漂移曲线的测试电路和方法。 在一个实施例中，导航系统接收器包括配置成为导航系统接收器和测试电路产生接收机时钟的时钟源。 测试电路被配置为便于基于由测试电路接收的测试信号的检测和跟踪来确定与接收机时钟相关联的漂移曲线，其中测试信号包括至少一个连续波（CW）信号。

公开(公告)号：US08582699B2

公开(公告)日：2013-11-12

申请号：US12698173

申请日：2010-02-02

申请人： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

发明人： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC分类号： H04L27/08

CPC分类号： H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

摘要： Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

摘要翻译： 接收机自动增益控制。 用于通过自动增益控制电路控制模数转换器（ADC）的操作范围的方法包括从模拟信号的数字样本估计对应于模拟信号的峰均比。 该方法包括基于峰均比来确定与模拟信号相对应的峰值。 此外，该方法包括基于峰值来维持ADC的输入处的模拟信号的幅度和接收机的增益。

公开(公告)号：US20110026651A1

公开(公告)日：2011-02-03

申请号：US12698173

申请日：2010-02-02

申请人： Bijoy BHUKANIA ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

发明人： Bijoy BHUKANIA ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC分类号： H04L27/08 ,  H03M1/12

CPC分类号： H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

摘要： Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

摘要翻译： 接收机自动增益控制。 用于通过自动增益控制电路控制模数转换器（ADC）的操作范围的方法包括从模拟信号的数字样本估计对应于模拟信号的峰均比。 该方法包括基于峰均比来确定与模拟信号相对应的峰值。 此外，该方法包括基于峰值来维持ADC的输入处的模拟信号的幅度和接收机的增益。

公开(公告)号：US20100036460A1

公开(公告)日：2010-02-11

申请号：US12536562

申请日：2009-08-06

申请人： Sthanunathan Ramakrishnan ,  Jawaharlal Tangudu ,  Visvesvaraya Pentakota

发明人： Sthanunathan Ramakrishnan ,  Jawaharlal Tangudu ,  Visvesvaraya Pentakota

IPC分类号： A61N1/08 ,  H04B1/16

CPC分类号： A61N1/3727

摘要： Parallel search circuit for a medical implant receiver. The circuit includes a radio frequency receiver that receives a first set of contents of a band of channels. The circuit also includes a processing circuit coupled to the radio frequency receiver to process in parallel a second set of contents of a plurality of channels of the band of channels and to detect a signal in the band of channels.

摘要翻译： 用于医疗植入物接收器的并行搜索电路。 该电路包括接收频道频带的第一组内容的射频接收机。 电路还包括耦合到射频接收机的处理电路并行处理频道频带的多个信道的第二组内容并且检测频道频带中的信号。

公开(公告)号：US20090252269A1

公开(公告)日：2009-10-08

申请号：US12060886

申请日：2008-04-02

申请人： Sarma S. Gunturi ,  Jawaharlal Tangudu ,  Sthanunathan Ramakrishnan ,  Jayawardan Janardhanan ,  Debapriya Sahu ,  Subhashish Mukherjee

发明人： Sarma S. Gunturi ,  Jawaharlal Tangudu ,  Sthanunathan Ramakrishnan ,  Jayawardan Janardhanan ,  Debapriya Sahu ,  Subhashish Mukherjee

IPC分类号： H04L7/00

CPC分类号： H04L27/362 ,  H04L7/0331

摘要： A method of achieving reduced modulation range requirement in a Digitally Controlled Oscillator (DCO) which is deployed as part of a DRP (Digital Radio Processor) and tuned to a tuning frequency range having operating-channel center-frequencies, wherein phase difference between consecutive samples is termed as FCW (Frequency Control Word), uses the steps of digitally modifying and limiting the FCW so that the FCW does not exceed known FCW thresholds, e.g., chosen from π/2, π/4, π/8, and redistributing the FCWs while maintaining a cumulative sum of phases and without significant EVM (Error Vector Magnitude) degradation. The FCW threshold can be chosen arbitrarily and need not be in the form of π/2n. The method uses a FCW limiting algorithm which reduces supply voltage sensitivity of the DCO and enables significant reduction in area of capacitor bank which would be otherwise needed.

摘要翻译： 一种在数字控制振荡器（DCO）中实现减少的调制范围要求的方法，其被部署为DRP（数字无线电处理器）的一部分并被调谐到具有操作信道中心频率的调谐频率范围，其中连续样本之间的相位差 被称为FCW（频率控制字），使用数字修改和限制FCW的步骤，使得FCW不超过已知的FCW阈值，例如从pi / 2，pi / 4，pi / 8选择并重新分配 FCW同时保持相位的累积和，并且没有显着的EVM（误差矢量幅度）劣化。 FCW阈值可以任​​意选择，不需要以pi / 2n的形式。 该方法使用FCW限制算法，其降低DCO的电源电压灵敏度，并且能够显着减小电容器组的面积，否则将需要它。

公开(公告)号：US20130034127A1

公开(公告)日：2013-02-07

申请号：US13204618

申请日：2011-08-05

申请人： Karthik Subburaj ,  Jawaharlal Tangudu ,  Raghu Ganesan ,  Karthik Ramasubramanian

发明人： Karthik Subburaj ,  Jawaharlal Tangudu ,  Raghu Ganesan ,  Karthik Ramasubramanian

IPC分类号： H04B1/7097

CPC分类号： H04B1/7097 ,  G01S19/21 ,  G01S19/33 ,  H04B1/7073 ,  H04B2201/70715

摘要： Example embodiments of the systems and methods of dynamic spur mitigation for wireless receivers disclosed herein comprise one or more of a detection module for detecting the presence of a spur and a determination of its frequency, a complex notch filter chain, and a frequency locked loop which ensures that the input spur is notch filtered even if it drifts after detection. When a spur is detected, the frequency of the tone is determined. The spur is then filtered, for example using a phase rotator and a DC separator. The phase rotation is removed in a subsequent stage. The non-DC component from the DC separator is used to track the spur to compensate for any shifting or drifting in the spur.

摘要翻译： 本文公开的用于无线接收机的动态杂散减轻的系统和方法的示例实施例包括用于检测杂散的存在和其频率的确定的检测模块，复陷波滤波器链和频率锁定环中的一个或多个 确保即使在检测到漂移后，输入杂散也被陷波滤波。 当检测到杂音时，确定音调的频率。 然后过滤杂质，例如使用相旋转器和DC分离器。 在后续阶段中除去相位旋转。 来自DC分离器的非直流分量用于跟踪支线以补偿支线中的任何变化或漂移。

公开(公告)号：US08345811B2

公开(公告)日：2013-01-01

申请号：US12060886

申请日：2008-04-02

申请人： Sarma S. Gunturi ,  Jawaharlal Tangudu ,  Sthanunathan Ramakrishnan ,  Jayawardan Janardhanan ,  Debapriya Sahu ,  Subhashish Mukherjee

发明人： Sarma S. Gunturi ,  Jawaharlal Tangudu ,  Sthanunathan Ramakrishnan ,  Jayawardan Janardhanan ,  Debapriya Sahu ,  Subhashish Mukherjee

IPC分类号： H04L7/00

CPC分类号： H04L27/362 ,  H04L7/0331

摘要： A method of achieving reduced modulation range requirement in a Digitally Controlled Oscillator (DCO) which is deployed as part of a DRP (Digital Radio Processor) and tuned to a tuning frequency range having operating-channel center-frequencies, wherein phase difference between consecutive samples is termed as FCW (Frequency Control Word), uses the steps of digitally modifying and limiting the FCW so that the FCW does not exceed known FCW thresholds, e.g., chosen from π/2, π/4, π/8, and redistributing the FCWs while maintaining a cumulative sum of phases and without significant EVM (Error Vector Magnitude) degradation. The FCW threshold can be chosen arbitrarily and need not be in the form of π/2n. The method uses a FCW limiting algorithm which reduces supply voltage sensitivity of the DCO and enables significant reduction in area of capacitor bank which would be otherwise needed.

摘要翻译： 一种在数字控制振荡器（DCO）中实现减少的调制范围要求的方法，其被部署为DRP（数字无线电处理器）的一部分并被调谐到具有操作信道中心频率的调谐频率范围，其中连续样本之间的相位差 被称为FCW（频率控制字），使用数字修改和限制FCW的步骤，使得FCW不超过已知的FCW阈值，例如从＆pgr; / 2，＆pgr; / 4，＆pgr / 并重新分配FCW，同时保持相位的累积和，并且没有显着的EVM（误差向量幅度）劣化。 FCW阈值可以任​​意选择，不需要以＆pgr / 2n的形式。 该方法使用FCW限制算法，其降低DCO的电源电压灵敏度，并且能够显着减小电容器组的面积，否则将需要它。

公开(公告)号：US20110051639A1

公开(公告)日：2011-03-03

申请号：US12546867

申请日：2009-08-25

申请人： Sthanunathan Ramakrishnan ,  Bijoy Bhukania ,  Jawaharlal Tangudu ,  Sarma S. Gunturi ,  Jaiganesh Balakrishnan ,  Rakesh Kumar ,  Abhijit Kumar Das ,  Yogesh Darwhekar

发明人： Sthanunathan Ramakrishnan ,  Bijoy Bhukania ,  Jawaharlal Tangudu ,  Sarma S. Gunturi ,  Jaiganesh Balakrishnan ,  Rakesh Kumar ,  Abhijit Kumar Das ,  Yogesh Darwhekar

IPC分类号： G08C17/02 ,  H04L27/00

CPC分类号： H04L12/12 ,  H04W24/00 ,  H04W28/18 ,  H04W52/028 ,  H04W84/12 ,  H04W84/18 ,  H04W88/02 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162 ,  Y02D70/23

摘要： A receiver in a packet based communication system includes a programmable block and a detection block that detects at least one of an operating condition of the receiver and a protocol condition of the communication system. Further, the receiver includes a control circuit coupled to the programmable block that controls the programmable block to transition to a set of radio modes according to at least one of the operating condition and the protocol condition.

摘要翻译： 基于分组的通信系统中的接收机包括可编程块和检测接收机的操作条件和通信系统的协议状态中的至少一个的检测块。 此外，接收机包括耦合到可编程块的控制电路，其根据操作条件和协议条件中的至少一个控制可编程块向一组无线电模式转变。

公开(公告)号：US08477631B2

公开(公告)日：2013-07-02

申请号：US12546867

申请日：2009-08-25

申请人： Sthanunathan Ramakrishnan ,  Bijoy Bhukania ,  Jawaharlal Tangudu ,  Sarma S Gunturi ,  Jaiganesh Balakrishnan ,  Rakesh Kumar ,  Abhijit Kumar Das ,  Yogesh Darwhekar

发明人： Sthanunathan Ramakrishnan ,  Bijoy Bhukania ,  Jawaharlal Tangudu ,  Sarma S Gunturi ,  Jaiganesh Balakrishnan ,  Rakesh Kumar ,  Abhijit Kumar Das ,  Yogesh Darwhekar

IPC分类号： H04B7/00

CPC分类号： H04L12/12 ,  H04W24/00 ,  H04W28/18 ,  H04W52/028 ,  H04W84/12 ,  H04W84/18 ,  H04W88/02 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162 ,  Y02D70/23

摘要： A receiver in a packet based communication system includes a programmable block and a detection block that detects at least one of an operating condition of the receiver and a protocol condition of the communication system. Further, the receiver includes a control circuit coupled to the programmable block that controls the programmable block to transition to a set of radio modes according to at least one of the operating condition and the protocol condition.

摘要翻译： 基于分组的通信系统中的接收机包括可编程块和检测接收机的操作条件和通信系统的协议条件中的至少一个的检测块。 此外，接收机包括耦合到可编程块的控制电路，其根据操作条件和协议条件中的至少一个控制可编程块向一组无线电模式转变。