公开(公告)号：US08218686B1

公开(公告)日：2012-07-10

申请号：US12420470

申请日：2009-04-08

申请人： Sergey Timofeev ,  Atul Salhotra ,  Kedar Shirali ,  Srinivasa H. Garlapati

发明人： Sergey Timofeev ,  Atul Salhotra ,  Kedar Shirali ,  Srinivasa H. Garlapati

IPC分类号： H04L25/06 ,  H04L25/10

CPC分类号： H04L25/062 ,  H03D2200/0047

摘要： An apparatus has front end circuitry to demodulate a radio frequency signal and to produce a baseband signal, the radio frequency signal being periodic and having a predetermined period. An analog-to-digital converter converts the baseband signal into a digital signal, the digital signal being periodic and having the predetermined period. A DC offset adjustment circuit includes a filter for estimating a DC offset contained in the digital signal based only on digital samples in a sample period having a length equal to the predetermined period. An adder removes the estimated DC offset from the digital signal. A method of operating such an apparatus is also disclosed.

摘要翻译： 一种装置具有用于解调射频信号并产生基带信号的前端电路，射频信号是周期性的并且具有预定周期。 模数转换器将基带信号转换为数字信号，数字信号是周期性的并且具有预定周期。 DC偏移调整电路包括用于仅在具有等于预定周期的长度的采样周期中的数字样本上估计包含在数字信号中的DC偏移的滤波器。 加法器从数字信号中去除估计的直流偏移。 还公开了一种操作这种装置的方法。

公开(公告)号：US08032095B1

公开(公告)日：2011-10-04

申请号：US11213907

申请日：2005-08-30

申请人： Kevin Hsiao-Cheng Tang ,  Atul Salhotra

发明人： Kevin Hsiao-Cheng Tang ,  Atul Salhotra

IPC分类号： H04B1/04

CPC分类号： H04B1/0466

摘要： A method and circuit for indicating signal faults in wireless transmissions, particularly, a carrier leak, includes an input to receive a wireless signal, a bias detector that detects a bias in a portion of the signal and outputs a bias value indicative of the bias, an evaluator configured to compare the bias value to at least one allowable transmission signal value, and output a signal when the bias value is outside the allowable transmission signal value, and an output, responsive to the evaluator, to indicate a carrier leakage in the wireless signal. A buffer may be provided between the input and the evaluator. The sensitivity of the circuit may be adjusted and a protocol determination may be made.

摘要翻译： 用于指示无线传输中的信号故障，特别是载波泄漏的方法和电路包括接收无线信号的输入端，偏置检测器，其检测信号的一部分中的偏置并输出指示偏置的偏置值， 评估器，被配置为将所述偏置值与至少一个可允许的传输信号值进行比较，并且当所述偏置值在所述允许的传输信号值之外时输出信号;以及响应于所述评估器的输出，以指示所述无线电中的载波泄漏 信号。 可以在输入和评估器之间提供缓冲器。 可以调整电路的灵敏度，并且可以进行协议确定。

公开(公告)号：US20110116399A1

公开(公告)日：2011-05-19

申请号：US12944031

申请日：2010-11-11

申请人： Thomas B. Cho ,  Li Lin ,  Mao Yu ,  Atul Salhotra

发明人： Thomas B. Cho ,  Li Lin ,  Mao Yu ,  Atul Salhotra

IPC分类号： H04L12/26 ,  H04W24/00

CPC分类号： H04L27/0002 ,  H03F1/0272 ,  H03G3/3068

摘要： Apparatus having corresponding methods and non-transitory computer-readable media comprise an amplifier configured to amplify signals according to a bias current, wherein the signals represent packets of data; a packet module configured to recover the packets of data from the signals amplified by the amplifier; and a control module configured to control the bias current according to one or more characteristics of the packets of data.

摘要翻译： 具有相应方法和非瞬时计算机可读介质的装置包括放大器，其经配置以根据偏置电流放大信号，其中所述信号表示数据分组; 分组模块，被配置为从放大器放大的信号中恢复数据分组; 以及控制模块，被配置为根据所述数据分组的一个或多个特性来控制所述偏置电流。

公开(公告)号：US07924930B1

公开(公告)日：2011-04-12

申请号：US11642442

申请日：2006-12-20

申请人： Atul Salhotra ,  Kedar Shirali ,  Zhiyu Yang ,  Hui-Ling Lou

发明人： Atul Salhotra ,  Kedar Shirali ,  Zhiyu Yang ,  Hui-Ling Lou

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04B7/02 ,  H04L1/02

CPC分类号： H04B7/0857 ,  H04B7/084 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A synchronization module for an orthogonal frequency-division multiplexing (OFDM) receiver system including a signal combination module that generates N combination signals that correspond to N received signals by performing at least one of weighted combining and selection and equal-gain-combining (EGC) on the N signals. A weighted signal generator module generates N weighted signals based on the N combination signals. N is an integer greater than one.

摘要翻译： 一种用于正交频分复用（OFDM）接收机系统的同步模块，包括信号组合模块，其通过执行加权组合和选择以及等增益组合（EGC）中的至少一个来产生对应于N个接收信号的N个组合信号， 对N信号。 加权信号发生器模块基于N个组合信号产生N个加权信号。 N是大于1的整数。

公开(公告)号：US08780872B1

公开(公告)日：2014-07-15

申请号：US13228071

申请日：2011-09-08

申请人： Harish Ramamurthy ,  Todd Steven Wheeler ,  Brian Bosso ,  Atul Salhotra ,  Ken Yeung

发明人： Harish Ramamurthy ,  Todd Steven Wheeler ,  Brian Bosso ,  Atul Salhotra ,  Ken Yeung

IPC分类号： H04W4/00

CPC分类号： H04W88/06 ,  H04B1/3827 ,  H04B7/024 ,  H04B7/0602 ,  H04B7/0802 ,  H04W4/80 ,  H04W84/12

摘要： Apparatus having corresponding methods and computer-readable media comprise: a first antenna; a second antenna; a first wireless local-area network (WLAN) transceiver configured to operate, on a dedicated basis, with the first antenna; a second WLAN transceiver configured to share operation of the second antenna; and a non-WLAN transceiver configured to operate with the second antenna with the second WLAN transceiver.

摘要翻译： 具有相应方法和计算机可读介质的装置包括：第一天线; 第二个天线; 第一无线局域网（WLAN）收发机，被配置为在专用的基础上与所述第一天线进行操作; 配置成共享第二天线的操作的第二WLAN收发器; 以及非WLAN收发器，被配置为利用所述第二WLAN收发器与所述第二天线一起操作。

公开(公告)号：US08705679B1

公开(公告)日：2014-04-22

申请号：US13053850

申请日：2011-03-22

申请人： Swaroop Venkatesh ,  Sergey Timofeev ,  Sudhir Srinivasa ,  Atul Salhotra ,  Rohit U. Nabar

发明人： Swaroop Venkatesh ,  Sergey Timofeev ,  Sudhir Srinivasa ,  Atul Salhotra ,  Rohit U. Nabar

IPC分类号： H04L7/06

CPC分类号： H04L27/2656 ,  H04L27/2672 ,  H04L27/2675

摘要： In a method for detecting a synchronization field in an orthogonal frequency division multiplexing (OFDM) signal, a plurality of discrete Fourier transform (DFT) values corresponding to the OFDM signal are generated. A plurality of magnitude or power values corresponding to the plurality of DFT values is determined. It is determined whether the plurality of magnitude or power values corresponds to a pattern of magnitude or power values. An indication that the synchronization field is detected in the OFDM signal is generated based on whether it is determined that the plurality of magnitude or power values correspond to the pattern of magnitude or power values.

摘要翻译： 在用于检测正交频分复用（OFDM）信号中的同步字段的方法中，生成与OFDM信号相对应的多个离散付里叶变换（DFT）值。 确定对应于多个DFT值的多个幅度或功率值。 确定多个量值或功率值是否对应于幅度或功率值的图案。 基于是否确定多个量值或功率值对应于幅度或功率值的图案，生成在OFDM信号中检测到同步场的指示。

公开(公告)号：US08625699B1

公开(公告)日：2014-01-07

申请号：US13338137

申请日：2011-12-27

申请人： Hui-Ling Lou ,  Bhaskar Nallapureddy ,  Atul Salhotra

发明人： Hui-Ling Lou ,  Bhaskar Nallapureddy ,  Atul Salhotra

IPC分类号： H04B7/02

CPC分类号： H04L5/0023 ,  H04B1/38 ,  H04B7/068 ,  H04L1/0071 ,  H04L5/0044 ,  H04L27/2637 ,  H04W72/04

摘要： Systems and techniques relating to processing multiple data streams transmitted over a wireless channel are described. A described technique includes obtaining data streams to be transmitted over a wireless channel using spatially diverse transmission; and applying rotations to the data streams in connection with interleaving the data streams. Applying the rotations can include using rotation values with respective data streams, the rotation values forming a sequence such that the rotation values plotted against stream indices oscillate in relative value within the sequence when a number of the data streams to be transmitted is greater than two. The rotations can include frequency rotations. The interleaving can include performing permutations, the permutations including a first permutation and a second permutation. Applying the rotations can include applying the frequency rotations after the second permutation.

摘要翻译： 描述了通过无线信道传输的处理多个数据流的系统和技术。 所描述的技术包括通过空间多样化的传输获得要通过无线信道发送的数据流; 并且与数据流的交织结合使用旋转到数据流。 应用旋转可以包括使用具有相应数据流的旋转值，旋转值形成一个序列，使得当要发送的数据流的数量大于2时，相对于流索引绘制的旋转值在序列内的相对值中振荡。 旋转可以包括频率旋转。 交织可以包括执行置换，排列包括第一置换和第二置换。 应用旋转可以包括在第二次排列之后施加频率旋转。

公开(公告)号：US08275323B1

公开(公告)日：2012-09-25

申请号：US11827958

申请日：2007-07-13

申请人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

发明人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

IPC分类号： H04B17/00

CPC分类号： H04W72/04 ,  H04B17/318 ,  H04W28/04 ,  H04W74/085

摘要： A system including an activity sensing module to sense RF activity in first and second sub-channels of a communication channel of a first wireless network. N adjacent channel interference (ACI) filter modules arranged in parallel receive signals from N antennas, respectively, filter out signals in channels adjacent to the communication channel, and generate N filtered signals, respectively, where N>2. The activity sensing module generates control signals based on the N filtered signals. A channel identification module processes the control signals, and determines that both of the first and second sub-channels are available when the RF activity originating from a second wireless network is not present in both of the first and second sub-channels, and that the first sub-channel is available when the RF activity originating from the second wireless network is present only in the second sub-channel and is less than or equal to a predetermined threshold.

摘要翻译： 一种系统，包括用于感测第一无线网络的通信信道的第一和第二子信道中的RF活动的活动感测模块。 N个天线并行布置的N个相邻信道干扰（ACI）滤波器模块分别接收与通信信道相邻的信道中的信号，并分别产生N个滤波信号，其中N≥2。 活动感测模块根据N个滤波信号产生控制信号。 信道识别模块处理控制信号，并且当源自第二无线网络的RF活动不存在于第一和第二子信道中时，确定第一和第二子信道都可用，并且 当来自第二无线网络的RF活动仅在第二子信道中存在且小于或等于预定阈值时，第一子信道可用。

公开(公告)号：US20080084835A1

公开(公告)日：2008-04-10

申请号：US11866754

申请日：2007-10-03

申请人： Sandesh Goel ,  Timothy Donovan ,  Ken Ho ,  Yungping Hsu ,  Kedar Shirali ,  Atul Salhotra ,  Tam Tran ,  Chia-Chun Chung

发明人： Sandesh Goel ,  Timothy Donovan ,  Ken Ho ,  Yungping Hsu ,  Kedar Shirali ,  Atul Salhotra ,  Tam Tran ,  Chia-Chun Chung

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W72/04 ,  H04W74/0808

摘要： A system includes a signal processing module and a control module. The signal processing module receives a first clear channel assessment (CCA) signal for a first sub-channel of a communication channel, increases a pulse width of the first CCA signal by a predetermined period of time, and generates a second CCA signal. The control module receives the second CCA signal and a third CCA signal for a second sub-channel of the communication channel. The control module transmits data via one of the second sub-channel and the communication channel based on the second and third CCA signals.

摘要翻译： 系统包括信号处理模块和控制模块。 信号处理模块接收通信信道的第一子信道的第一清除信道评估（CCA）信号，将第一CCA信号的脉冲宽度增加预定时间段，并产生第二CCA信号。 控制模块接收第二CCA信号和用于通信信道的第二子信道的第三CCA信号。 控制模块基于第二和第三CCA信号，经由第二子信道和通信信道中的一个发送数据。

公开(公告)号：US08838038B1

公开(公告)日：2014-09-16

申请号：US13613996

申请日：2012-09-13

申请人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

发明人： Kedar Shirali ,  Atul Salhotra ,  Zhiyu Yang

IPC分类号： H04B17/00 ,  H04W72/04

CPC分类号： H04W72/04 ,  H04B17/318 ,  H04W28/04 ,  H04W74/085

摘要： A system including a plurality of filter modules to respectively communicate with a plurality of antennas, filter signals from channels other than a communication channel of a first wireless network, where the communication channel includes a first channel and a second channel, and generate a plurality of signals. A sensing module senses, based on the plurality of signals, whether radio frequency signals from a second network are present in at least one of the first channel and the second channel, and generates a plurality of control signals indicating presence or absence of the radio frequency signals in at least one of the first channel and the second channel. A channel identification module determines, based on the plurality of control signals, availability of the first channel and the second channel in response to whether the radio frequency signals are present in the first channel and the second channel.

摘要翻译： 一种系统，包括分别与多个天线通信的多个滤波器模块，从除第一无线网络的通信信道之外的信道中滤除信号，其中所述通信信道包括第一信道和第二信道，并且生成多个 信号。 感测模块​​基于多个信号来感测来自第二网络的射频信号是否存在于第一信道和第二信道中的至少一个中，并且生成指示有无射频的多个控制信号 在第一通道和第二通道中的至少一个通道中的信号。 信道识别模块响应于射频信号是否存在于第一信道和第二信道中，基于多个控制信号确定第一信道和第二信道的可用性。