公开(公告)号：US09001948B2

公开(公告)日：2015-04-07

申请号：US12977094

申请日：2010-12-23

申请人： Sthanunathan Ramakrishnan

发明人： Sthanunathan Ramakrishnan

IPC分类号： H04L27/18 ,  H04L27/22 ,  H04L27/00 ,  H04L27/06 ,  H04L27/04 ,  H04L27/20 ,  H04L25/03 ,  H04L27/34

CPC分类号： H04L25/03834 ,  H04L27/2017 ,  H04L27/3411

摘要： A transmitter used in a communication system includes a raised cosine filter for transmit pulse shaping. A receiver in the communication system, designed to receive and demodulate transmissions from the transmitter, includes a root-raised cosine filter for receive pulse shaping. The use of a raised cosine filter in the transmitter enables reduction of peak-to-average ratio (PAR) of the output of a power amplifier used in the transmitter, enabling the power amplifier to be implemented to have relatively higher power efficiency than otherwise. In an embodiment, the transmitter and receiver employ π/2-shift binary phase-shift keying (π/2 BPSK), and the raised cosine filter in the transmitter is implemented to have a roll-off factor of 0.5 and a total length of four symbol periods. In an embodiment, the root-raised cosine filter is implemented to have a roll-of factor of 0.2 and a length of four symbol periods.

摘要翻译： 在通信系统中使用的发射机包括用于发射脉冲整形的升余弦滤波器。 通信系统中的接收机，用于接收和解调来自发射机的传输，包括用于接收脉冲整形的根升余弦滤波器。 在发射机中使用升余弦滤波器能够降低在发射机中使用的功率放大器的输出的峰均比（PAR），使功率放大器能够实现比其它功率效率更高的功率效率。 在一个实施例中，发射机和接收机采用＆pgr / 2移位二进制相移键控（＆pgr / / BPSK），并且发射机中的升余弦滤波器被实现为具有0.5的滚降因子和总共 四个符号周期的长度。 在一个实施例中，根升余弦滤波器被实现为具有0.2的折叠因子和四个符号周期的长度。

公开(公告)号：US20130154879A1

公开(公告)日：2013-06-20

申请号：US13330473

申请日：2011-12-19

申请人： Sthanunathan Ramakrishnan ,  Sandeep Rao

发明人： Sthanunathan Ramakrishnan ,  Sandeep Rao

IPC分类号： G01S19/42

CPC分类号： G01S19/426 ,  G01S19/20

摘要： Methods and integrated circuits for performing receiver autonomous integrity monitoring (RAIM) in global navigation satellite system (GNSS) receivers are disclosed. In an embodiment, a first information comprising current position related information is accessed. A second information comprising predicted position related information is accessed based on previously received information. A solution is computed based on the first information and the second information and a presence of outlier information is determined in at least one of the first information and the second information based on the solution.

摘要翻译： 公开了用于在全球导航卫星系统（GNSS）接收机中执行接收机自主完整性监测（RAIM）的方法和集成电路。 在一个实施例中，访问包括当前位置相关信息的第一信息。 基于先前接收到的信息来访问包括预测位置相关信息的第二信息。 基于第一信息和第二信息计算解决方案，并且基于解决方案在第一信息和第二信息中的至少一个中确定离群信息的存在。

公开(公告)号：US20070274205A1

公开(公告)日：2007-11-29

申请号：US11420619

申请日：2006-05-26

申请人： Karthik Ramasubramanian ,  Sthanunathan Ramakrishnan

发明人： Karthik Ramasubramanian ,  Sthanunathan Ramakrishnan

IPC分类号： H04J3/14 ,  H04L12/56

CPC分类号： H04L7/042 ,  H04L27/2647

摘要： The present invention provides a system for obviating interference effects in packet detection within a wireless communications network. A plurality of reference signals is provided—a first of which corresponds to desired packets, and the remainder of which correspond to undesired packets or interference. A plurality of cross-correlation constructs corresponds, respectively, to the plurality of reference signals. Each cross-correlation construct correlates an incoming signal to a plurality of repetitions of its respective reference signal. An analysis construct compares output from each cross-correlation construct with other cross-correlation construct outputs, and with a threshold value, to determine which incoming signal corresponds to desired packet data. Once this incoming signal is identified, packets from the signal may be reliably received.

摘要翻译： 本发明提供了一种用于消除无线通信网络内的分组检测中的干扰影响的系统。 提供了多个参考信号 - 第一个参考信号对应于期望的分组，其余部分对应于不期望的分组或干扰。 多个互相关构造分别对应于多个参考信号。 每个互相关构造将输入信号与其相应参考信号的多个重复相关联。 分析构造将来自每个互相关构造的输出与其他互相关构造输出和阈值进行比较，以确定哪个输入信号对应于期望的分组数据。 一旦该输入信号被识别，则可以可靠地接收来自信号的分组。

公开(公告)号：US09069073B2

公开(公告)日：2015-06-30

申请号：US13330473

申请日：2011-12-19

申请人： Sthanunathan Ramakrishnan ,  Sandeep Rao

发明人： Sthanunathan Ramakrishnan ,  Sandeep Rao

IPC分类号： G01S19/42 ,  G01S19/20

CPC分类号： G01S19/426 ,  G01S19/20

摘要： Methods and integrated circuits for performing receiver autonomous integrity monitoring (RAIM) in global navigation satellite system (GNSS) receivers are disclosed. In an embodiment, a first information comprising current position related information is accessed. A second information comprising predicted position related information is accessed based on previously received information. A solution is computed based on the first information and the second information and a presence of outlier information is determined in at least one of the first information and the second information based on the solution.

摘要翻译： 公开了用于在全球导航卫星系统（GNSS）接收机中执行接收机自主完整性监测（RAIM）的方法和集成电路。 在一个实施例中，访问包括当前位置相关信息的第一信息。 基于先前接收到的信息来访问包括预测位置相关信息的第二信息。 基于第一信息和第二信息计算解决方案，并且基于解决方案在第一信息和第二信息中的至少一个中确定离群信息的存在。

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。

公开(公告)号：US20110250931A1

公开(公告)日：2011-10-13

申请号：US13078748

申请日：2011-04-01

申请人： Tarkesh Pande ,  Jaiganesh Balakrishnan ,  Deric Waters ,  Goutam Dutta ,  Jayawardan Janardhanan ,  Sthanunathan Ramakrishnan ,  Sandeep Rao ,  Karthik Ramasubramanian

发明人： Tarkesh Pande ,  Jaiganesh Balakrishnan ,  Deric Waters ,  Goutam Dutta ,  Jayawardan Janardhanan ,  Sthanunathan Ramakrishnan ,  Sandeep Rao ,  Karthik Ramasubramanian

IPC分类号： G01C21/00 ,  G01S1/08 ,  H04W88/02 ,  G01S1/02

CPC分类号： G01S19/47 ,  G01C21/165

摘要： A personal navigation device configured to determine heading readings continuously using data from a sensor in the personal navigation device. Heading readings are selected corresponding to a periodic event. A representative heading is determined from the selected heading readings. When a portion of the selected heading readings has a value within a range of the representative heading, a static heading indicator is asserted to indicate the personal navigation device is moving in a static heading. The static heading indicator may be used to smooth an estimated trajectory of the personal navigation device.

摘要翻译： 一种个人导航装置，被配置为使用来自个人导航装置中的传感器的数据连续地确定航向读数。 根据周期性事件选择标题读数。 从所选标题读数确定代表性标题。 当所选航标读数的一部分具有在代表性标题的范围内的值时，断言静态航向指示符以指示个人导航设备正在静态航向中移动。 静态航向指示符可以用于平滑个人导航设备的估计轨迹。

公开(公告)号：US20110006933A1

公开(公告)日：2011-01-13

申请号：US12575337

申请日：2009-10-07

申请人： Viswanathan Nagarajan ,  Sriram Murali ,  Sthanunathan Ramakrishnan ,  Visvesvaraya Pentakota ,  Jaiganesh Balakrishnan

发明人： Viswanathan Nagarajan ,  Sriram Murali ,  Sthanunathan Ramakrishnan ,  Visvesvaraya Pentakota ,  Jaiganesh Balakrishnan

IPC分类号： H03M1/06 ,  H03M1/66

CPC分类号： H03M1/1057 ,  H03M1/0836 ,  H03M1/1215

摘要： A time-interleaved (TI) analog-to-digital converter (ADC) is provided. The TI ADC generally comprises a clock generator, two or more ADCs, adjustable delay elements, and an estimator. The clock generator generates clock signals. Each ADC is associated with at least one of the clock signals so as to sample an input signal that is generally wide-sense stationary at sampling instants, where correlation function exist between samples from a two or more of the ADCs that is a function of the time differences between associated sampling instants. The estimator is coupled to each of the adjustable delay elements and each of the ADCs so as to calculate the correlation function and adjust the adjustable delay elements to account for sampling mismatch between the ADCs based at least in part on the correlation function.

摘要翻译： 提供了时间交织（TI）模数转换器（ADC）。 TI ADC通常包括时钟发生器，两个或更多个ADC，可调延迟元件和估计器。 时钟发生器产生时钟信号。 每个ADC与至少一个时钟信号相关联，以便在采样时刻对通常为宽静态的输入信号进行采样，其中相关函数存在于两个或更多个ADC之间的样本之间，该两个或更多个ADC是 相关抽样时间之间的时间差异。 估计器耦合到每个可调节延迟元件和每个ADC，以便计算相关函数，并且至少部分地基于相关函数来调整可调延迟元件以考虑ADC之间的采样失配。

公开(公告)号：US20100036462A1

公开(公告)日：2010-02-11

申请号：US12536592

申请日：2009-08-06

申请人： Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

发明人： Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

IPC分类号： A61N1/08

CPC分类号： A61N1/37252 ,  A61N1/08 ,  A61N1/37211

摘要： Power optimization in a medical implant based system. A method includes receiving a portion of a signal by a first transceiver. The method further includes determining, from the portion of the signal, a time duration after which a subsequent portion of the signal will be transmitted. The subsequent portion is transmitted at end of the portion. The method also includes entering into an inactive state for the time duration.

摘要翻译： 基于医疗植入物系统的功率优化。 一种方法包括通过第一收发器接收信号的一部分。 所述方法还包括从所述信号的所述部分确定所述信号的后续部分将被发送的持续时间。 随后的部分在该部分的末端被传送。 该方法还包括在持续时间内进入非活动状态。

公开(公告)号：US20100036459A1

公开(公告)日：2010-02-11

申请号：US12536520

申请日：2009-08-06

申请人： Sthanunathan RAMAKRISHNAN ,  Ganesan THIAGARAJAN ,  Kumar Divyesh SHAH ,  Jaiganesh BALAKRISHNAN ,  Sriram MURALI

发明人： Sthanunathan RAMAKRISHNAN ,  Ganesan THIAGARAJAN ,  Kumar Divyesh SHAH ,  Jaiganesh BALAKRISHNAN ,  Sriram MURALI

IPC分类号： A61N1/08

CPC分类号： A61N1/3727

摘要： Signaling in a medical implant based system. A method includes transmitting bits modulated with a predefined sequence in a band of channels by a first medical transceiver. The method includes detecting the predefined sequence by a second medical transceiver. The method also includes performing predetermined action if the predefined sequence is detected. In one example, the predetermined action includes determining presence of a signal.

摘要翻译： 在医疗植入物系统中进行信号传导。 一种方法包括通过第一医疗收发器传输利用频道频带中的预定义序列调制的比特。 该方法包括通过第二医疗收发器检测预定义的序列。 如果检测到预定义的序列，该方法还包括执行预定的动作。 在一个示例中，预定动作包括确定信号的存在。

公开(公告)号：US20080043888A1

公开(公告)日：2008-02-21

申请号：US11828349

申请日：2007-07-26

申请人： Bijoy Bhukania ,  Raghu Ganesan ,  Naga Satya Srikanth Puvvada ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

发明人： Bijoy Bhukania ,  Raghu Ganesan ,  Naga Satya Srikanth Puvvada ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

IPC分类号： H04L1/00 ,  H04B1/10 ,  H04B1/707

CPC分类号： H04L27/2647 ,  H04B1/71 ,  H04L25/03006

摘要： A wireless device receives an input signal representing a signal of interest (e.g., one or more portions of a packet) on a wireless medium. The input signal may, in addition, contain narrowband interference signals. The wireless device removes the signal of interest from the input signal to produce a residue signal, and analyzes the residue signal to determine the presence of any interference bands in which narrowband interference signals may be present. The wireless device then removes the detected interference bands from the input signal. The residue signal may reveal the presence of interference signals, which might otherwise be hard to distinguish in the input signal. Thus, interference signals with power levels much lower than the power of the signal of interest may be detected and removed.

摘要翻译： 无线设备在无线介质上接收表示感兴趣的信号（例如，分组的一个或多个部分）的输入信号。 此外，输入信号可以包含窄带干扰信号。 无线设备从输入信号中去除感兴趣的信号以产生残余信号，并且分析残差信号以确定可能存在窄带干扰信号的任何干扰频带的存在。 无线设备然后从输入信号中去除检测到的干扰带。 残留信号可能显示干扰信号的存在，否则在输入信号中可能难以区分。 因此，可以检测和去除具有远低于感兴趣信号的功率的功率水平的干扰信号。