公开(公告)号：US09520646B1

公开(公告)日：2016-12-13

申请号：US14311261

申请日：2014-06-21

申请人： Deepu Vasudevan Nair ,  Varun Ramchandani ,  Suresh Kumar Vagvala ,  Partha Sarathy Murali

发明人： Deepu Vasudevan Nair ,  Varun Ramchandani ,  Suresh Kumar Vagvala ,  Partha Sarathy Murali

IPC分类号： H01Q5/00 ,  H01Q1/48 ,  H01Q9/04 ,  H01Q1/24

CPC分类号： H01Q5/0027 ,  H01Q1/243 ,  H01Q1/38 ,  H01Q1/48 ,  H01Q5/392 ,  H01Q9/045 ,  H01Q9/42

摘要： A printed circuit antenna has a feedline region and a radiating structure region. The feedline region is formed of conductors on an upper plane, the conductors including a feedline which is edge coupled to a left ground structure and a right ground structure, all of which are above a ground plane. High-band RF is coupled from the RF feedline to a HB-U radiating structure including a first segment and a second segment perpendicular to the first segment, and also an HB-L radiating structure including a first segment coupled to a third segment through an air gap. Low-band RF is coupled across a gap from the first segment to a LB radiating structure having a third segment, a fourth segment, a fifth segment, a sixth segment, a seventh segment, an eighth segment, and a ninth segment with a terminus coupled to the left ground structure.

摘要翻译： 印刷电路天线具有馈线区域和辐射结构区域。 馈线区域由上平面上的导体形成，导体包括与左接地结构边缘耦合的馈线和右接地结构，所有这些都在接地平面之上。 高频RF从RF馈线耦合到包括垂直于第一段的第一段和第二段的HB-U辐射结构，还包括一个HB-L辐射结构，其包括通过一个第二段耦合到第三段的第一段 气隙。 低频RF耦合跨越从第一段到具有第三段，第四段，第五段，第六段，第七段，第八段和第九段的具有终点的第一段的间隔 耦合到左地面结构。

公开(公告)号：US08332451B2

公开(公告)日：2012-12-11

申请号：US12324835

申请日：2008-11-27

申请人： Phanimithra Gangalakurti ,  Karthik Vaidyanathan ,  Partha Sarathy Murali ,  InduSheknar Ayyalasomayajula

发明人： Phanimithra Gangalakurti ,  Karthik Vaidyanathan ,  Partha Sarathy Murali ,  InduSheknar Ayyalasomayajula

IPC分类号： G06F7/38 ,  G06F17/14

CPC分类号： G06F7/5446

摘要： A CORDIC processor has a plurality of stages, each of the stages having a X input, Y input, a sign input, a sign output, an X output, a Y output, a mode control input having a ROTATE or VECTOR value, and a stage number k input, each CORDIC stage having a first shift generating an output by shifting the Y input k times, a second shift generating an output by shifting X input k times, a multiplexer having an output coupled to the sign input when the mode control input is ROTATE and to the sign of the Y input when the mode input is VECTOR, a first multiplier forming the product of the first shift output and the multiplexer output, a second multiplier forming the product of the second shift output and an inverted the multiplexer output, a first adder forming the X output from the sum of the first multiplier output and the X input, and a second adder forming the Y output from the sum of the second multiplier output and the Y input.

摘要翻译： CORDIC处理器具有多个级，每个级具有X输入，Y输入，符号输入，符号输出，X输出，Y输出，具有ROTATE或VECTOR值的模式控制输入，以及 每个CORDIC级具有通过移位Y输入k次而产生输出的第一移位，通过移位X个输入k次来产生输出的第二移位;当模式控制时，具有耦合到符号输入的输出的多路复用器 当模式输入为VECTOR时，输入为ROTATE和Y输入的符号，形成第一移位输出和多路复用器输出的积的第一乘法器，形成第二移位输出和反相多路复用器的乘积的第二乘法器 输出，从第一乘法器输出和X输入的和形成X输出的第一加法器和从第二乘法器输出和Y输入的和形成Y输出的第二加法器。

公开(公告)号：US08165251B2

公开(公告)日：2012-04-24

申请号：US12197230

申请日：2008-08-23

申请人： Prem Kiran Nerella ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

发明人： Prem Kiran Nerella ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

IPC分类号： H04B1/10

CPC分类号： H04L27/2647 ,  H04L27/2626

摘要： A filter for receiver and operative on a stream of OFDM symbols has a symbol timing identifier which indicates the time interval for each symbol and also indicates a non-truncation interval and a truncation interval of the stream of symbols. The stream of OFDM symbols is applied to an infinite impulse response (IIR) filter with a reset input for resetting internal registers such that during the non-truncation interval, the reset input is not asserted, and during the truncation interval of the stream of OFDM symbols, the reset input is asserted during the intervals between symbols, as identified by the symbol timing identifier.A transmit filter for a stream of OFDM symbols, each symbol being separated into a first Tg interval, a second Tg interval, a symbol interval, and a final Tg interval, the filter has a stream modifier which discards the first Tg interval, accepts said second Tg interval, accepts the symbol interval and discards said final Tg interval, presenting to an infinite impulse response filter, in sequence, the second Tg interval, the symbol interval and the second Tg interval.

摘要翻译： 用于接收机并在OFDM符号流上操作的滤波器具有指示每个符号的时间间隔的符号定时标识符，并且还指示符号流的非截断间隔和截断间隔。 OFDM符号流被应用于具有用于复位内部寄存器的复位输入的无限脉冲响应（IIR）滤波器，使得在非截断间隔期间，复位输入不被断言，并且在OFDM的流的截断间隔期间 在由符号定时标识符识别的符号之间的间隔期间，复位输入被断言。 一种用于OFDM符号流的发射滤波器，每个符号被分成第一Tg间隔，第二Tg间隔，符号间隔和最终Tg间隔，滤波器具有丢弃第一Tg间隔的流修改器，接受所述 第二Tg间隔接受符号间隔并丢弃所述最终Tg间隔，依次呈现无限脉冲响应滤波器，第二Tg间隔，符号间隔和第二Tg间隔。

公开(公告)号：US08160190B2

公开(公告)日：2012-04-17

申请号：US12197229

申请日：2008-08-22

申请人： Prem Kiran Nerella ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

发明人： Prem Kiran Nerella ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

IPC分类号： H04B1/10

CPC分类号： H04L27/2626 ,  H04L27/2647

摘要： A receive filter for a stream of OFDM symbols has an infinite impulse response (IIR) filter which receives packets having a preamble part followed by a data part, the data part having a succession of cyclic prefixes followed by OFDM symbols. The packet is provided to the IIR filter, and the registers of the IIR filter are reset before or during each cyclic prefix. The IIR filter may be formed from registers which are coupled to return a value to a predecessor register, or as an array of registers, such as in a BIQUAD configuration, where the registers are reset by a shared reset signal.

摘要翻译： 用于OFDM符号流的接收滤波器具有无限脉冲响应（IIR）滤波器，其接收具有后继数据部分的前导码部分的分组，该数据部分具有随后是OFDM符号的一系列循环前缀。 该分组被提供给IIR滤波器，并且IIR滤波器的寄存器在每个循环前缀之前或期间被复位。 IIR滤波器可以由寄存器形成，寄存器被耦合以将值返回到前驱寄存器，或者作为诸如在BIQUAD配置中的寄存器阵列，其中寄存器被共享复位信号复位。

公开(公告)号：US08090035B2

公开(公告)日：2012-01-03

申请号：US12211301

申请日：2008-09-16

申请人： Dharani Naga Sailaja Sankabathula ,  Partha Sarathy Murali ,  Logeshwaran Vijayan ,  Nagaraja Reddy Anakala

发明人： Dharani Naga Sailaja Sankabathula ,  Partha Sarathy Murali ,  Logeshwaran Vijayan ,  Nagaraja Reddy Anakala

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H03G3/3052 ,  H04L27/0006 ,  H04L27/2647

摘要： An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required.

摘要翻译： 分组检测控制器接受来自AGC控制器的输入，其指示增加的信号能量的存在以及AGC处理的完成，并且产生用于暂停AGC过程的输出。 分组检测控制器还接收多个IQ接收机流并且形成单个流以供分组检测器使用，该分组检测器可以由指示信噪比是高于还是低于特定阈值的SNR_MODE控制，以及表示PD_RESET信号的PD_RESET信号 不会发生数据包检测。 控制器还接收一个指示分组检测完成的PACKET_DET信号。 如果产生分组检测，分组检测控制器检查输入的接收机流并暂停AGC处理，或者如果需要AGC过程则暂停分组检测器。

公开(公告)号：US08031762B2

公开(公告)日：2011-10-04

申请号：US12185741

申请日：2008-08-04

申请人： Logeshwaran Vijayan ,  Sundaram Vanka ,  Partha Sarathy Murali ,  Phanimithra Gangalakurthi

发明人： Logeshwaran Vijayan ,  Sundaram Vanka ,  Partha Sarathy Murali ,  Phanimithra Gangalakurthi

IPC分类号： H03H7/30

CPC分类号： H04L25/0204 ,  H04L25/0246 ,  H04L27/2647 ,  H04L27/38 ,  H04L2025/03426

摘要： A process for equalizing streams of OFDM subcarrier data computes the noise variance for each stream, and forms a stream weighting coefficient by equalizing the noise variance, such that for a first stream having a noise variance σ1 and a second stream having a noise variance of σ2, the first stream is scaled by k 1 = 2 ⁢ σ 2 σ 1 2 + σ 2 2 and the second stream is scaled by k 2 = 2 ⁢ σ 1 σ 1 2 - σ 2 2 .

摘要翻译： 用于均衡OFDM子载波数据流的过程计算每个流的噪声方差，并且通过均衡噪声方差形成流加权系数，使得对于具有噪声方差的第一流和具有噪声方差的第二流 ＆sgr; 2，第一个流被缩放k 1 = 2＆sgr; 2＆sgr 1 2 +＆sgr 2 2，第二个流被k 2 = 2＆sgr; 1＆sgr 1 2 - ＆sgr 2 2。

公开(公告)号：US07986738B2

公开(公告)日：2011-07-26

申请号：US11874913

申请日：2007-10-19

申请人： Dharani Naga Sailaja Sankabathula ,  Partha Sarathy Murali

发明人： Dharani Naga Sailaja Sankabathula ,  Partha Sarathy Murali

IPC分类号： H04L27/28

CPC分类号： H04L27/2618

摘要： An OFDM symbol comprises information subcarriers which carry the information to be transmitted, accompanied by edge subcarriers, which are selected to minimize the PAPR of the transmitted signal. The selection of edge subcarriers which minimizes PAPR enables either higher power transmission for the same information content, or lower power consumption for the same transmitted symbol power.

摘要翻译： OFDM符号包括携带要发送的信息的信息子载波，伴随着边缘子载波，其被选择为使发送的信号的PAPR最小化。 使PAPR最小化的边缘子载波的选择能够为相同的信息内容提供更高的功率传输，或者为同一传输的符号功率提供更低的功耗。

公开(公告)号：US20100109796A1

公开(公告)日：2010-05-06

申请号：US12264904

申请日：2008-11-04

申请人： Seok-Bae Park ,  Partha Sarathy Murali

发明人： Seok-Bae Park ,  Partha Sarathy Murali

IPC分类号： H01P1/15

CPC分类号： H01P1/213

摘要： A transmit-receive switch has a transmit port, an antenna port, and a receive port. A first switch couples the transmit port to the antenna port when a signal TxON is asserted. A LOW_BAND signal indicates the selection of a lower band of frequencies. A tuning structure is formed by a second and third switch in series which couple the antenna port to ground through a first capacitor when TxON and LOW_BAND are both asserted, and LOW_BAND may be provided to one or more such tuning structures for multi-band frequency operation. A second capacitor couples the antenna port to ground when a fourth switch is enabled. An inductor couples the antenna port to the receive port. A third capacitor is placed across the receive port and ground. A fifth switch is closed when TxON is asserted. The first through fifth switches can be a CMOS FET with an isolated substrate coupled to ground through an associated resistor.

摘要翻译： 发送接收交换机具有发送端口，天线端口和接收端口。 当信号TxON被断言时，第一开关将发送端口耦合到天线端口。 LOW_BAND信号表示选择较低的频带。 调谐结构由第二和第三开关串联形成，当TxON和LOW_BAND均被断言时，第一和第二电容器将天线端口耦合到地，并且LOW_BAND可被提供给一个或多个这样的调谐结构用于多频带频率操作 。 当启用第四个开关时，第二个电容将天线端口耦合到地。 电感将天线端口耦合到接收端口。 第三个电容放置在接收端和接地之间。 当TxON置位时，第五个开关闭合。 第一至第五开关可以是具有通过相关联的电阻器耦合到地的隔离衬底的CMOS FET。

公开(公告)号：US20100046647A1

公开(公告)日：2010-02-25

申请号：US12197232

申请日：2008-08-23

申请人： Prem Kiran NERELLA ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

发明人： Prem Kiran NERELLA ,  Karthik Vaidyanathan ,  Partha Sarathy Murali

IPC分类号： H04J11/00 ,  H04L27/28

CPC分类号： H04L27/2626 ,  H04L27/2647

摘要： A filter for receiver and operative on a stream of OFDM symbols has a symbol timing identifier which indicates the time interval for each symbol and also indicates a non-truncation interval and a truncation interval of the stream of symbols. The stream of OFDM symbols is applied to an infinite impulse response (IIR) filter with a reset input for resetting internal registers such that during the non-truncation interval, the reset input is not asserted, and during the truncation interval of the stream of OFDM symbols, the reset input is asserted during the intervals between symbols, as identified by the symbol timing identifier.A transmit filter for a stream of OFDM symbols, each symbol being separated into a first Tg interval, a second Tg interval, a symbol interval, and a final Tg interval, the filter has a stream modifier which discards the first Tg interval, accepts said second Tg interval, accepts the symbol interval and discards said final Tg interval, presenting to an infinite impulse response filter, in sequence, the second Tg interval, the symbol interval and the second Tg interval.

公开(公告)号：US20100027702A1

公开(公告)日：2010-02-04

申请号：US12185741

申请日：2008-08-04

申请人： Logeshwaran Vijayan ,  Sundaram Vanka ,  Partha Sarathy Murali ,  Phanimithra Gangalakurthi

发明人： Logeshwaran Vijayan ,  Sundaram Vanka ,  Partha Sarathy Murali ,  Phanimithra Gangalakurthi

IPC分类号： H04B7/02

CPC分类号： H04L25/0204 ,  H04L25/0246 ,  H04L27/2647 ,  H04L27/38 ,  H04L2025/03426

摘要： A process for equalizing streams of OFDM subcarrier data computes the noise variance for each stream, and forms a stream weighting coefficient by equalizing the noise variance, such that for a first stream having a noise variance σ1 and a second stream having a noise variance of σ2, the first stream is scaled by k 1 = 2  σ 2 σ 1 2 + σ 2 2 and the second stream is scaled by k 2 = 2  σ 1 σ 1 2 - σ 2 2 .

摘要翻译： 用于均衡OFDM子载波数据流的过程计算每个流的噪声方差，并且通过均衡噪声方差形成流加权系数，使得对于具有噪声方差σ1的第一流和具有sigma2的噪声方差的第二流 ，第一个流由k 1 = 2西格玛2西格玛2 2西格玛2 2缩放，第二个流由k 2 = 2西格玛1西格玛2 2缩放。