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21. 发明授权

US08774708B2 Estimation of repeater loop delay for repeater gain control 失效
标题翻译：用于中继器增益控制的中继器回路延迟的估计
公开(公告)号：US08774708B2
公开(公告)日：2014-07-08
申请号：US13372385
申请日：2012-02-13
申请人： Michael Mao Wang , Gwendolyn Denise Barriac , Dhananjay Ashok Gore
发明人： Michael Mao Wang , Gwendolyn Denise Barriac , Dhananjay Ashok Gore
IPC分类号： H04B7/14
CPC分类号： H04B7/15578 , H04B7/15535
摘要： Methods and apparatus for estimating a loop delay value (Ndelay) in an interference cancellation repeater are presented. For example, a method may include setting a repeater gain to an initial gain value, setting a delay parameter to an initial time value, and measuring a loop gain associated with the delay parameter and the repeater gain by detecting a feedback signal with an echo canceller disabled. The method may further include determining whether the measured loop gain is larger than a previously measured loop gain, and if so, designating the delay parameter as the loop delay value (Ndelay); and decrementing the delay parameter when the measured loop gain is not larger than the previously measured loop gain, and when the delay parameter is not at a final time value. The method may iterate until the delay parameter is less than or equal to the final time value.
摘要翻译：提出了一种用于估计干扰消除中继器中的环路延迟值（Ndelay）的方法和装置。例如，一种方法可以包括将中继器增益设置为初始增益值，将延迟参数设置为初始时间值，以及通过用回波消除器检测反馈信号来测量与延迟参数和中继器增益相关联的环路增益残疾人士该方法还可以包括确定测量的环路增益是否大于先前测量的环路增益，如果是，则将延迟参数指定为环路延迟值（Ndelay）; 并且当测量的环路增益不大于先前测量的环路增益时，以及当延迟参数不在最终时间值时，递减延迟参数。该方法可以迭代，直到延迟参数小于或等于最终时间值。

22. 发明授权

US08644214B2 Timing synchronization and channel estimation at a transition between local and wide area waveforms using a designated TDM pilot 有权
标题翻译：使用指定的TDM导频在本地和广域波形之间转换的定时同步和信道估计
公开(公告)号：US08644214B2
公开(公告)日：2014-02-04
申请号：US12862740
申请日：2010-08-24
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Michael Mao Wang
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Michael Mao Wang
IPC分类号： H04B7/212
CPC分类号： H04L27/2613 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/0216 , H04L25/0226 , H04L25/03866 , H04L27/2662 , H04L27/2675
摘要： Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver.
摘要翻译：提供了系统和方法用于无线网络中的信道估计和定时同步。在一个实施例中，提供了一种用于在无线接收机处进行时间同步的方法。该方法包括解码位于宽和局部波形之间的转变处的至少一个TDM导频符号，并处理TDM导频符号以对无线接收机执行时间同步。还提供了在无线接收机处进行信道估计的方法。这包括解码至少一个TDM导频符号并从OFDM广播接收TDM导频符号以便于无线接收机的信道估计。

23. 发明授权

US08432933B2 Method for transmission of time division multiplexed pilot symbols to aid channel estimation, time synchronization, and AGC bootstrapping in a multicast wireless system 有权
标题翻译：用于传输时分复用导频符号以辅助多播无线系统中的信道估计，时间同步和AGC引导的方法
公开(公告)号：US08432933B2
公开(公告)日：2013-04-30
申请号：US12896780
申请日：2010-10-01
申请人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J3/00
CPC分类号： H04L27/2613 , H04L5/0007 , H04L5/0048 , H04L25/023
摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.
摘要翻译：提供了用于传输波形以辅助无线网络中的信道估计，定时同步和AGC自举的系统和方法。该方法包括插入位于广域和局域波形之间的转变处的至少一个TDM导频符号，以便于传输块的解码。

24. 发明申请

US20120263167A1 TIMING AND FREQUENCY ACQUISITION FOR WIRELESS NETWORKS 审中-公开
标题翻译：无线网络的时序和频率采集
公开(公告)号：US20120263167A1
公开(公告)日：2012-10-18
申请号：US13531489
申请日：2012-06-22
申请人： Michael Mao Wang
发明人： Michael Mao Wang
IPC分类号： H04W56/00 , H04L27/06 , H04J3/06
CPC分类号： H04L27/2662 , H04L5/0007 , H04L27/2657 , H04L27/2675 , H04W56/00
摘要： Systems and methods are provided for processing Time Domain Multiplexing Pilot symbols by employing complex accumulators to determine peak values which indicate the start of timing and frequency information. In an embodiment, a method is provided for timing acquisition in a wireless network. The method includes acquiring samples from an Orthogonal Frequency Division Multiplexing (OFDM) data packet over a predetermined period of time, where the samples include one or more TDM pilot symbols. The samples are then processed to determine a maximum value that indicates the TDM pilot symbol has been detected.
摘要翻译：提供了系统和方法，用于通过采用复合累加器来确定指示定时和频率信息开始的峰值来处理时域多路复用导频符号。在一个实施例中，提供了一种用于无线网络中的定时获取的方法。该方法包括在预定时间段内从正交频分复用（OFDM）数据分组获取样本，其中样本包括一个或多个TDM导频符号。然后处理样本以确定指示已经检测到TDM导频符号的最大值。

25. 发明授权

US08189539B2 System and method for frequency diversity 有权
标题翻译：频率分集的系统和方法
公开(公告)号：US08189539B2
公开(公告)日：2012-05-29
申请号：US11192789
申请日：2005-07-29
申请人： Michael Mao Wang , Fuyun Ling , Murali Ramaswamy Chari , Rajiv Vijayan
发明人： Michael Mao Wang , Fuyun Ling , Murali Ramaswamy Chari , Rajiv Vijayan
IPC分类号： H04B7/216
CPC分类号： H04L1/0071 , H01R24/38 , H03M13/27 , H03M13/271 , H03M13/2757 , H03M13/276 , H03M13/2771 , H04L1/00 , H04L1/0041 , H04L1/0066 , H04L1/007 , H04L5/0007 , H04L5/0042 , H04L5/0044 , H04L5/0048 , H04L5/0083 , H04L25/0226 , H04L27/2607 , H04L27/261 , H04L27/2626 , H04L27/2656 , H04L27/2662
摘要： A system and method for frequency diversity uses interleaving. Subcarriers of an interlace are interleaved in a bit reversal fashion and the interlaces are interleaved in the bit reversal fashion.
摘要翻译：用于频率分集的系统和方法使用交织。交织的子载波以位反转的方式进行交织，并且以位反转方式交错交织。

26. 发明授权

US08165167B2 Time tracking for a communication system 有权
标题翻译：通讯系统的时间跟踪
公开(公告)号：US08165167B2
公开(公告)日：2012-04-24
申请号：US11371536
申请日：2006-03-08
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Mao Wang
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Mao Wang
IPC分类号： H04J11/00 , H04L7/00
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L25/0216 , H04L25/022 , H04L25/0228 , H04L27/261 , H04L27/265 , H04L27/2665 , H04L27/2679
摘要： A method for characterizing a communication channel is disclosed. A detection window is moved through a channel profile to accumulate tap energies in the channel profile within the detection window into an accumulated energy curve. A peak at a maximum in the accumulated energy curve is determined. A band relative to the accumulated energy curve is defined. A first arriving path (FAP) is determined using a trailing edge found near a second end of a zone in the accumulated energy curve. A leading edge is found near a first end of the zone of the accumulated energy curve. The last arriving path (LAP) is determined using the leading edge. The band defines a zone of the accumulated energy curve at or near the maximum that is within the band.
摘要翻译：公开了一种用于表征通信信道的方法。检测窗口通过通道轮廓移动，以将检测窗口内的通道轮廓中的抽头能量累积为累积的能量曲线。确定累积能量曲线中最大值的峰值。定义相对于累积能量曲线的带。使用在累积能量曲线中的区域的第二端附近发现的后沿来确定第一到达路径（FAP）。在累积能量曲线的区域的第一端附近发现前沿。最后到达路径（LAP）使用前沿确定。频带定义在频带内或附近的最大值处的累积能量曲线的区域。

27. 发明申请

US20110058469A1 WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS 有权
标题翻译：用于通信系统的宽带和本地网络标识传输
公开(公告)号：US20110058469A1
公开(公告)日：2011-03-10
申请号：US12948759
申请日：2010-11-18
申请人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
发明人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajiv Vijayan
IPC分类号： H04J11/00 , H04L27/28
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/0083 , H04L27/261
摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.
摘要翻译：这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。导频可以被构造成单个OFDM符号和/或多个OFDM符号。用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

28. 发明申请

US20100285742A1 GAIN CONTROL METRIC PRUNING IN A WIRELESS REPEATER 有权
标题翻译：在无线重发器中增益控制公制
公开(公告)号：US20100285742A1
公开(公告)日：2010-11-11
申请号：US12722760
申请日：2010-03-12
申请人： Michael Mao Wang , Gwendolyn Denise Barriac , Dhananjay Ashok Gore
发明人： Michael Mao Wang , Gwendolyn Denise Barriac , Dhananjay Ashok Gore
IPC分类号： H04B7/14
CPC分类号： H04B7/15578
摘要： A method for controlling gain in a wireless repeater includes computing a gain control metric indicative of a loop gain of the repeater and detecting changes in a signal power of a gain control input signal where the gain control input signal is taken from any point in the feedback loop of the repeater. When a large power swing in the gain control input signal is detected, the method operates to discard at least a portion of each gain control metric measurement for a first duration before continuing with computing the gain control metric. In another embodiment, the method may include discarding samples of the gain control input signal used in computing the gain control metric for a first duration when a large power swing in the gain control input signal is detected.
摘要翻译：一种用于控制无线中继器中的增益的方法包括：计算表示中继器的环路增益的增益控制度量，并且检测增益控制输入信号的信号功率的变化，其中增益控制输入信号是从反馈中的任何点中继器的回路。当检测到增益控制输入信号中的大功率摆幅时，该方法在继续计算增益控制度量之前，在第一持续时间内丢弃每个增益控制度量测量的至少一部分。在另一实施例中，当检测到增益控制输入信号中的大功率摆幅时，该方法可以包括丢弃用于计算增益控制度量的增益控制输入信号的采样，该第一持续时间。

29. 发明申请

US20100285738A1 SIGNAL BLANKING FOR IMPROVED FREQUENCY DOMAIN CHANNEL ESTIMATION 有权
标题翻译：用于改进的频域信道估计的信号空白
公开(公告)号：US20100285738A1
公开(公告)日：2010-11-11
申请号：US12708318
申请日：2010-02-18
申请人： Steven J. Howard , Tadeusz Jarosinski , Dhananjay Ashok Gore , Gwendolyn Denise Barriac , Michael Mao Wang , Tao Tian
发明人： Steven J. Howard , Tadeusz Jarosinski , Dhananjay Ashok Gore , Gwendolyn Denise Barriac , Michael Mao Wang , Tao Tian
IPC分类号： H04B17/02
CPC分类号： H04B7/15535 , H04B7/15585 , H04L27/2607 , H04L27/2613
摘要： A wireless repeater includes a channel estimation block to estimate a feedback channel between the antennas of the repeater using frequency domain channel estimation. The repeater includes a pilot signal blanking circuit to blank out a selected number of samples of the pilot signal to improve the accuracy of the channel estimation. In another embodiment, the repeater replaces T samples of the pilot signal with a cyclic prefix.
摘要翻译：无线中继器包括信道估计块，用于使用频域信道估计来估计中继器的天线之间的反馈信道。中继器包括导频信号消隐电路，用于消除导频信号的选定数目的样本，以提高信道估计的精度。在另一个实施例中，中继器用循环前缀替换导频信号的T个样本。

30. 发明申请

US20100285733A1 WIDEBAND ECHO CANCELLATION IN A REPEATER 失效
标题翻译：一个重复的宽带ECHO取消
公开(公告)号：US20100285733A1
公开(公告)日：2010-11-11
申请号：US12609505
申请日：2009-10-30
申请人： Dhananjay Ashok Gore , Gwendolyn Denise Barriac , James Arthur Proctor, JR. , Steven J. Howard , Hakan Inanoglu , Kenneth M. Gainey , Michael Mao Wang , Tao Tian
发明人： Dhananjay Ashok Gore , Gwendolyn Denise Barriac , James Arthur Proctor, JR. , Steven J. Howard , Hakan Inanoglu , Kenneth M. Gainey , Michael Mao Wang , Tao Tian
IPC分类号： H04B7/14
CPC分类号： H04B7/15535 , H04B7/15585 , H04L27/2607 , H04L27/2613
摘要： A wireless repeater having a receiving antenna for receiving an input signal and a transmitting antenna for transmitting an amplified signal includes first and second front-end circuits and a repeater baseband block coupled between the first and second front-end circuits. The repeater baseband block includes a channel estimation block, an echo canceller implementing time domain echo cancellation, a variable gain stage controlled by a gain control block implementing digital gain control, a first variable delay element introducing a first delay before or after the echo canceller, a second variable delay element introducing a second delay to the output signal. The delayed output signal is coupled to the channel estimation block as a reference signal for estimating the feedback channel, to the echo canceller as a reference signal for estimating the feedback signal, and to the gain control block for monitoring the stability of the repeater.
摘要翻译：具有用于接收输入信号的接收天线和用于发送放大信号的发射天线的无线中继器包括耦合在第一和第二前端电路之间的第一和第二前端电路和中继器基带块。中继器基带块包括信道估计块，实现时域回声消除的回波消除器，实现数字增益控制的增益控制块控制的可变增益级，在回波消除器之前或之后引入第一延迟的第一可变延迟元件，向输出信号引入第二延迟的第二可变延迟元件。延迟输出信号作为用于估计反馈信道的参考信号，作为用于估计反馈信号的参考信号的回波消除器和用于监视中继器的稳定性的增益控制块耦合到信道估计块。

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