公开(公告)号：US20110274002A1

公开(公告)日：2011-11-10

申请号：US13041068

申请日：2011-03-04

Applicant: Thomas E. PARE, JR. ,  Yung-Szu TU ,  Kiran ULN ,  Ravishankar H. MAHADEVAPPA

Inventor： Thomas E. PARE, JR. ,  Yung-Szu TU ,  Kiran ULN ,  Ravishankar H. MAHADEVAPPA

IPC: H04L12/26 ,  H04W24/00

CPC classification number: H04W4/08 ,  H04B7/0452 ,  H04W4/21 ,  H04W8/005 ,  H04W8/186 ,  H04W24/00 ,  H04W24/10 ,  H04W88/08

Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.

Abstract translation: 公开了用于对连接到接入点（AP）的多个站进行分组的方法和系统。 该系统和方法包括向多个站发送探测分组，其中所述站可以是位于AP范围内的站的全部或部分。 接收到探测包的站响应AP，AP确定响应中的信道状态信息（CSI）。 根据CSI，AP将多个站分成几个组。 根据本发明的实施例，分别对每组电台执行确认步骤。 AP向每组站发送第二个探测包，并按组验证每个站组之间的CSI。 因此，该方法和系统通过周期性地向每个组发送声音分组来提供对每个组的验证的监视。

公开(公告)号：US07916799B2

公开(公告)日：2011-03-29

申请号：US11696113

申请日：2007-04-03

Applicant: Stephan ten Brink ,  Ravishankar H. Mahadevappa

Inventor： Stephan ten Brink ,  Ravishankar H. Mahadevappa

IPC: H04L27/28

CPC classification number: H04B1/7183

Abstract: A method and a receiver system for subcarrier-specific frequency offset correction including frequency offset estimation, updating and compensation. The method includes initial frequency offset estimation in time domain using packet preamble, frequency offset compensation during channel estimation symbols using the initial frequency offset estimate, and frequency offset update tracking during header and data part both being performed in the frequency domain. The initial frequency offset estimation includes using a sum over a number of time lagged autocorrelation results, corresponding to a number of the last consecutive symbols of the preamble part of the packet with the autocorrelations being the result of a sum over a window of cross-correlations between the incoming signal and the respective packet synchronization sequence. The receiver includes receiver blocks for initial frequency offset estimation, frequency offset compensation, frequency offset update tracking and obtaining a current frequency offset estimate.

Abstract translation: 一种用于子载波特定频偏校正的方法和接收机系统，包括频偏估计，更新和补偿。 该方法包括使用分组前导码的时域中的初始频率偏移估计，使用初始频率偏移估计的信道估计符号期间的频率偏移补偿以及在频域中执行的报头和数据部分期间的频率偏移更新跟踪。 初始频率偏移估计包括使用与多个时间滞后自相关结果相对应的和，其对应于分组的前导码部分的最后连续符号的数量，其中自相关是互相关窗口上的和的结果 在输入信号和相应的分组同步序列之间。 接收机包括用于初始频率偏移估计的接收器块，频率偏移补偿，频率偏移更新跟踪和获得当前频率偏移估计。

公开(公告)号：US20070280366A1

公开(公告)日：2007-12-06

申请号：US11757247

申请日：2007-06-01

Applicant: Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

Inventor： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

IPC: H04K1/10

CPC classification number: H04L25/0228 ,  H04L25/022 ,  H04L27/2647

Abstract: A receiver including a channel estimation function in which an initial channel estimate is filtered to increase receiver operation, particularly when the receiver may only have a limited number of channel estimation symbols with which to form the channel estimate. In some embodiments the filtering is performed by transforming the initial channel estimate to the time domain, zeroing some of the samples to filter the time domain channel estimate, and transforming the filtered time domain channel estimate to the frequency domain for use in channel compensation.

Abstract translation: 一种包括信道估计功能的接收机，其中对初始信道估计进行滤波以增加接收机操作，特别是当接收机只能具有用于形成信道估计的有限数量的信道估计符号时。 在一些实施例中，通过将初始信道估计变换到时域来执行滤波，对某些采样进行归零以对时域信道估计进行滤波，并将经滤波的时域信道估计变换到频域以用于信道补偿。

公开(公告)号：US08457162B2

公开(公告)日：2013-06-04

申请号：US11506193

申请日：2006-08-16

Applicant: Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

Inventor： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

IPC: H04J3/06

CPC classification number: H04L7/042 ,  H04B1/7183 ,  H04L27/2656 ,  H04L27/2675 ,  H04L27/2676 ,  H04W24/00

Abstract: An apparatus for and a method of performing packet detection in a receiver is provided. The apparatus is configured to determine a measure of a correlation between information of one or more received symbols and synchronization information. The apparatus is also configured to determine a measure of an energy value of one or more of the received symbols. The apparatus is also configured to determine if a packet has been detected based on the measure of the correlation and the measure of the energy value of the one or more received symbols.

Abstract translation: 提供了一种用于在接收机中执行分组检​​测的装置和方法。 该装置被配置为确定一个或多个接收到的符号的信息与同步信息之间的相关性的度量。 该装置还被配置为确定一个或多个接收符号的能量值的度量。 该装置还被配置为基于相关性的测量和一个或多个接收符号的能量值的测量来确定是否已经检测到分组。

公开(公告)号：US08254480B2

公开(公告)日：2012-08-28

申请号：US13044157

申请日：2011-03-09

Applicant: Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

Inventor： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

IPC: H04K1/10 ,  H04L27/28

CPC classification number: H04L27/2601 ,  H03G3/3068 ,  H04B1/71637 ,  H04L27/2647

Abstract: An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.

Abstract translation: 一种用于在接收机处对OFDM符号进行信号处理的自动增益控制方法和系统。 实现两级粗略和精细的自动增益控制，可在接收机的模拟RF处理阶段调整不同的增益。 基于来自数字基带级的反馈，在第一和粗略的自动增益控制级中调整低噪声放大器和混频器的增益。 在随后的精细增益控制周期期间，可编程增益放大器的增益分别针对由OFDM符号使用的每个频带进行调整，所述频带基于对其幅度在一定范围内的模数转换器的输出样本数进行计数的直方图单元 范围。 在每个OFDM符号之后更新粗和细增益。

公开(公告)号：US20120002652A1

公开(公告)日：2012-01-05

申请号：US13175746

申请日：2011-07-01

Applicant: Kiran ULN ,  Thomas E. PARE, JR. ,  Ravishankar H. MAHADEVAPPA

Inventor： Kiran ULN ,  Thomas E. PARE, JR. ,  Ravishankar H. MAHADEVAPPA

IPC: H04W84/02

CPC classification number: H04W28/065 ,  H04L1/0069

Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.

Abstract translation: 公开了一种在发送和接收多用户分组的无线通信系统中使用的方法和系统。 通信系统包括与其通信的发射机和多个用户。 该方法和系统包括确定用于发送分组的最低编码方案; 并且通过对分组中的比特进行去穿孔来导出用于从标准编码率有效传输分组的编码率。 根据本发明的系统和方法提供了对分组长度的有效利用，并且通过降低MCS，非穿孔和/或重复来提高SNR，从而提高了可靠性。 还提供了更高效的打包数据速率，并且Tx和Rx独立地计算参数。

公开(公告)号：US08913515B2

公开(公告)日：2014-12-16

申请号：US13313920

申请日：2011-12-07

Applicant: Ravishankar H. Mahadevappa ,  Thomas E. Pare, Jr. ,  Kiran Uln

Inventor： Ravishankar H. Mahadevappa ,  Thomas E. Pare, Jr. ,  Kiran Uln

IPC: G01R31/08 ,  H04W4/00 ,  H04W24/10 ,  H04W84/12

CPC classification number: H04W24/10 ,  H04W84/12

Abstract: Embodiments for improving multi-user downlink reception quality in WLANS are disclosed. In one embodiment, a method includes receiving, at a station, at least one multi-user sounding packet from an access point. The method also includes determining a sum of desired signal strengths from the at least one received sounding packet. The method also includes determining a sum of interference signal strengths from the at least one received sounding packet. The method also includes generating link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths.

Abstract translation: 公开了用于改善WLANS中的多用户下行接收质量的实施例。 在一个实施例中，一种方法包括在站处从接入点接收至少一个多用户探测分组。 该方法还包括从至少一个接收到的探测分组确定期望的信号强度之和。 该方法还包括确定来自至少一个接收的探测分组的干扰信号强度之和。 该方法还包括基于期望信号强度之和与干扰信号强度之和的比率来产生链路质量度量。

公开(公告)号：US08824386B2

公开(公告)日：2014-09-02

申请号：US13041177

申请日：2011-03-04

Applicant: Thomas E. Pare, Jr. ,  Cheng-Hsuan Wu ,  Yung-Szu Tu ,  Kiran Uln ,  Ravishankar H. Mahadevappa

Inventor： Thomas E. Pare, Jr. ,  Cheng-Hsuan Wu ,  Yung-Szu Tu ,  Kiran Uln ,  Ravishankar H. Mahadevappa

IPC: H04W4/00 ,  H04W4/08 ,  H04W4/20 ,  H04W8/18 ,  H04B7/04

CPC classification number: H04B7/0456 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0626 ,  H04W4/08 ,  H04W4/21 ,  H04W8/186 ,  H04W24/00 ,  H04W24/10

Abstract: A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group.

Abstract translation: 公开了用于对连接到接入点（AP）的多个站进行分组的方法和系统。 该系统和方法包括向多个站发送探测分组，其中所述站可以是位于AP范围内的站的全部或部分。 接收到探测包的站响应AP，AP确定响应中的信道状态信息（CSI）。 根据CSI，AP将多个站分成几个组。 根据本发明的实施例，分别对每组电台执行确认步骤。 AP向每组站发送第二个探测包，并按组验证每个站组之间的CSI。 因此，该方法和系统通过周期性地向每个组发送声音分组来提供对每个组的验证的监视。

公开(公告)号：US08804681B2

公开(公告)日：2014-08-12

申请号：US13175746

申请日：2011-07-01

Applicant: Kiran Uln ,  Thomas E. Pare, Jr. ,  Ravishankar H. Mahadevappa

Inventor： Kiran Uln ,  Thomas E. Pare, Jr. ,  Ravishankar H. Mahadevappa

IPC: H04W4/00

CPC classification number: H04W28/065 ,  H04L1/0069

Abstract: A method and system utilized in a wireless communication system transmitting and receiving a multi-user packet is disclosed. The communication system includes a transmitter and a plurality of users in communication therewith. The method and system comprise determining a lowest coding scheme for transmitting the packet; and deriving a coding rate for the efficient transmission of the packet from a standard coding rate by de-puncturing bits in the packet. A system and method in accordance with the present invention provides for an efficient utilization of packet length, and improves the reliability by improving SNR, by lowering the MCS, un-puncturing, and/or repetition. More efficient packed data rates are also provided and both Tx and Rx compute parameters independently.

Abstract translation: 公开了一种在发送和接收多用户分组的无线通信系统中使用的方法和系统。 通信系统包括与其通信的发射机和多个用户。 该方法和系统包括确定用于发送分组的最低编码方案; 并且通过对分组中的比特进行去穿孔来导出用于从标准编码率有效传输分组的编码率。 根据本发明的系统和方法提供了对分组长度的有效利用，并且通过降低MCS，非穿孔和/或重复来提高SNR，从而提高了可靠性。 还提供了更高效的打包数据速率，并且Tx和Rx独立地计算参数。

公开(公告)号：US20130100943A1

公开(公告)日：2013-04-25

申请号：US13276776

申请日：2011-10-19

Applicant: Ravishankar H. MAHADEVAPPA

Inventor： Ravishankar H. MAHADEVAPPA

IPC: H04W84/02

CPC classification number: H04L27/2656 ,  H04L27/261 ,  H04L27/2671 ,  H04L27/2688 ,  H04L27/2692

Abstract: Embodiments for processing signals are disclosed. In one embodiment, a method includes providing a plurality of cyclically shifted versions of a known sequence. The method also includes receiving a plurality of delayed versions of a received sequence of a packet. The method also includes correlating the plurality of the delayed versions of the received sequence with the plurality of cyclically shifted versions of the known sequence. The method also includes detecting a preamble of the packet based on the outcome of a described decision statistic computed using the received and known sequences.

Abstract translation: 公开了处理信号的实施例。 在一个实施例中，一种方法包括提供已知序列的多个循环移位版本。 该方法还包括接收分组的接收序列的多个延迟版本。 该方法还包括将接收到的序列的多个延迟版本与已知序列的多个循环移位版本相关联。 该方法还包括基于使用所接收和已知序列计算的描述的判定统计量的结果来检测分组的前同步码。