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71.发明授权公开(公告)号：US08358986B2
公开(公告)日：2013-01-22
申请号：US12051224
申请日：2008-03-19
IPC分类号： H04B1/18
CPC分类号： H04W72/04 , H04W72/005
摘要： Methods and apparatus for RF channel selection in a multi-frequency network. A method includes identifying selected local operations infrastructures (LOIs) and their neighboring LOIs, generating a neighbor description message (NDM) that identifies the selected LOIs and their neighboring LOIs and associates a descrambling sequence identifier with each RF channel of the selected LOIs and their neighboring LOIs, and distributing the NDM over the selected LOIs. An apparatus includes a message decoder to receive an NDM that identifies RF channels of a first LOI and neighboring LOIs, and wherein each RF channel is associated with a descrambling sequence identifier, and processing logic to detect content acquisition failures, determine a list of RF channels and their associated LOIs that carry desired content, and select a selected RF channel that is associated with a selected LOI that carries the most additional content among the associated LOIs.
摘要翻译： 用于多频网络中RF信道选择的方法和装置。 一种方法包括识别所选择的本地操作基础设施（LOI）及其相邻的LOI，生成识别所选择的LOI及其邻近LOI的邻居描述消息（NDM），并将解扰序列标识符与所选择的LOI的每个RF信道及其相邻的 LOI，并在所选LOI上分发NDM。 一种装置包括：消息解码器，用于接收标识第一LOI和相邻LOI的RF信道的NDM，并且其中每个RF信道与解扰序列标识符相关联，以及用于检测内容获取失败的处理逻辑，确定RF信道列表 以及它们相关联的LOI，其携带期望的内容，并且选择与所关联的LOI中携带最多附加内容的所选LOI相关联的所选RF信道。
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72.发明申请公开(公告)号：US20100246564A1
公开(公告)日：2010-09-30
申请号：US12644856
申请日：2009-12-22
CPC分类号： H04L27/2662 , H04L25/0212 , H04L25/0216 , H04L27/2695
摘要： The embodiments provide mechanisms for synchronizing a receiver with OFDM pilots that are robust in the presence of channel fading conditions. In addition to using instantaneous channel estimate values to locate the first arriving path and last arriving path, the methods calculate time-domain averaged channel estimate values and use those averaged values to determine an average first arriving path and last arriving path. A combination of the instantaneous first arriving path and last arriving path and the average first arriving path and last arriving path may then be used to determine the delay spread and calculate a timing offset to be applied in timing synchronization. The various embodiments introduce improvements under channel fading conditions. Time-domain averaging may be embodied in a flexible DSP processor, or implemented in hardware and/or software. Using both instantaneous and time-averaged channel estimates greatly improves the robustness of time synchronization under channel fading conditions.
摘要翻译： 实施例提供了用于使接收机与存在信道衰落条件时鲁棒的OFDM导频同步的机制。 除了使用瞬时信道估计值来定位第一到达路径和最后到达路径之外，该方法还计算时域平均信道估计值，并使用这些平均值来确定平均第一到达路径和最后到达路径。 然后可以使用瞬时第一到达路径和最后到达路径以及平均第一到达路径和最后到达路径的组合来确定延迟扩展，并计算要在定时同步中应用的定时偏移。 各种实施例在信道衰落条件下引入改进。 时域平均可以体现在灵活的DSP处理器中，或者在硬件和/或软件中实现。 使用瞬时和时间平均信道估计大大提高了信道衰落条件下时间同步的鲁棒性。
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73.发明申请公开(公告)号：US20080261547A1
公开(公告)日：2008-10-23
申请号：US12051224
申请日：2008-03-19
IPC分类号： H04B1/18
CPC分类号： H04W72/04 , H04W72/005
摘要： Methods and apparatus for RF channel selection in a multi-frequency network. A method includes identifying selected local operations infrastructures (LOIs) and their neighboring LOIs, generating a neighbor description message (NDM) that identifies the selected LOIs and their neighboring LOIs and associates a descrambling sequence identifier with each RF channel of the selected LOIs and their neighboring LOIs, and distributing the NDM over the selected LOIs. An apparatus includes a message decoder to receive an NDM that identifies RF channels of a first LOI and neighboring LOIs, and wherein each RF channel is associated with a descrambling sequence identifier, and processing logic to detect content acquisition failures, determine a list of RF channels and their associated LOIs that carry desired content, and select a selected RF channel that is associated with a selected LOI that carries the most additional content among the associated LOIs.
摘要翻译： 用于多频网络中RF信道选择的方法和装置。 一种方法包括识别所选择的本地操作基础设施（LOI）及其相邻的LOI，生成识别所选择的LOI及其邻近LOI的邻居描述消息（NDM），并将解扰序列标识符与所选择的LOI的每个RF信道及其相邻的 LOI，并在所选LOI上分发NDM。 一种装置包括：消息解码器，用于接收标识第一LOI和相邻LOI的RF信道的NDM，并且其中每个RF信道与解扰序列标识符相关联，以及用于检测内容获取失败的处理逻辑，确定RF信道列表 以及它们相关联的LOI，其携带期望的内容，并且选择与所关联的LOI中携带最多附加内容的所选LOI相关联的所选RF信道。
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公开(公告)号：US20080253331A1
公开(公告)日：2008-10-16
申请号：US12051758
申请日：2008-03-19
IPC分类号： H04Q7/00
CPC分类号： H04W36/30 , H04W36/0055 , H04W72/005
摘要： Methods and apparatus for RF handoff in a multi-frequency network. A method includes generating seamless and partially seamless handoff tables for multiplexes carried in a current LOI, wherein the seamless and partially seamless handoff tables comprise neighboring RF channels carrying one or more of the multiplexes in the current LOI, detecting a handoff event initiated by acquisition failures on a current RF, selecting a selected RF channel from the seamless and partially seamless handoff tables, and performing a handoff to the selected RF channel. An apparatus includes processing logic configured to generate the seamless and partially seamless handoff tables, detect a handoff event initiated by acquisition failures on a current RF, and select a selected RF channel from the seamless and partially seamless handoff tables. The apparatus also includes channel switch logic configured to perform a handoff to the selected RF channel.
摘要翻译： 多频网络中RF切换的方法和装置。 一种方法包括为当前LOI中携带的多路复用产生无缝和部分无缝切换表，其中无缝和部分无缝切换表包括在当前LOI中携带一个或多个多路复用的相邻RF信道，检测由采集失败发起的切换事件 在当前RF上，从无缝和部分无缝切换表中选择所选择的RF信道，以及对所选择的RF信道执行切换。 一种装置包括处理逻辑，其被配置为生成无缝和部分无缝切换表，检测由当前RF获取故障引发的切换事件，以及从无缝和部分无缝切换表中选择所选择的RF信道。 该装置还包括被配置为执行到所选择的RF信道的切换的信道切换逻辑。
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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
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。
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公开(公告)号：US20050122928A1
公开(公告)日：2005-06-09
申请号：US10968787
申请日：2004-10-18
申请人： Rajiv Vijayan , Fuyun Ling , Gordon Walker , Ramaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan
发明人： Rajiv Vijayan , Fuyun Ling , Gordon Walker , Ramaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan
CPC分类号： H04L5/0041 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L12/189 , H04W72/005
摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.
摘要翻译： 为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号 根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。 分别基于广域和本地传输的期望覆盖来选择第一和第二模式。 基站还为本地和广域传输生成导频和开销信息。 用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。 多于两种不同类型的传输也可以被复用和广播。
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公开(公告)号：US20110051618A1
公开(公告)日：2011-03-03
申请号：US12939118
申请日：2010-11-03
CPC分类号： H04L25/0232 , H04L25/022
摘要： Time filtering channel estimates in a wireless communication system, such as an Orthogonal Frequency Division Multiplex (OFDM) system, can be used to improve the quality of channel estimates. The characteristics of an optimal channel estimate time filter can depend on the manner in which the channel estimate is determined as well as the time correlation of channel estimates. A receiver can implement an adaptive time filter for channel estimates in which the time filter response can vary based on channel estimate parameters. The channel estimate parameters can include the manner of determining channel estimates, a time correlation of channel estimates, and an estimated Doppler frequency. The time filter response can be varied continuously over a range of responses or can be varied discretely over a predetermined number of time filter responses.
摘要翻译： 在诸如正交频分复用（OFDM）系统的无线通信系统中的时间滤波信道估计可以用于提高信道估计的质量。 最优信道估计时间滤波器的特征可以取决于信道估计的方式以及信道估计的时间相关性。 接收机可以实现用于信道估计的自适应时间滤波器，其中时间滤波器响应可以基于信道估计参数而变化。 信道估计参数可以包括确定信道估计的方式，信道估计的时间相关性和估计的多普勒频率。 时间滤波器响应可以在响应范围内连续变化，或者可以在预定数量的时间滤波器响应上离散变化。
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公开(公告)号：US07881245B2
公开(公告)日：2011-02-01
申请号：US12506055
申请日：2009-07-20
申请人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan, legal representative
发明人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaaswamy Murali , Ashok Mantravadi , Anand Subramaniam
IPC分类号： H04H20/71
CPC分类号： H04L5/0041 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L12/189 , H04W72/005
摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.
摘要翻译： 为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号 根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。 分别基于广域和本地传输的期望覆盖来选择第一和第二模式。 基站还为本地和广域传输生成导频和开销信息。 用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。 多于两种不同类型的传输也可以被复用和广播。
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公开(公告)号：US20100098032A1
公开(公告)日：2010-04-22
申请号：US12646520
申请日：2009-12-23
申请人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan
发明人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan
CPC分类号： H04L5/0041 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L12/189 , H04W72/005
摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.
摘要翻译： 为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号 根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。 分别基于广域和本地传输的期望覆盖来选择第一和第二模式。 基站还为本地和广域传输生成导频和开销信息。 用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。 多于两种不同类型的传输也可以被复用和广播。
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80.发明授权Switching diversity in broadcast OFDM systems based on multiple receive antennas 有权基于多个接收天线的广播OFDM系统中的交换分集公开(公告)号：US08441913B2
公开(公告)日：2013-05-14
申请号：US11521701
申请日：2006-09-15
申请人： Linbo Li , Ashok Mantravadi , Fuyun Ling
发明人： Linbo Li , Ashok Mantravadi , Fuyun Ling
IPC分类号： H04J11/00
CPC分类号： H04B7/0404 , H04B7/0805 , H04B7/0808 , H04B7/0811 , H04B7/0814 , H04B7/0857 , H04B7/0874 , H04L1/0003 , H04L1/0057 , H04L1/0066 , H04L25/022 , H04L27/2647 , H04W72/085
摘要： Systems and methods are provided for enhancing signal quality at receivers in a wireless network. In one embodiment, an antenna is selected from a subset of antennas based on a signal quality parameter such as received signal power or signal-to-noise ratio (SNR). In another embodiment, multiple antennas are applied to independent signal processing paths for the respective antennas where output from the paths is then combined to enhance overall signal quality at the receiver.
摘要翻译： 提供了用于在无线网络中的接收机处提高信号质量的系统和方法。 在一个实施例中，基于诸如接收信号功率或信噪比（SNR）的信号质量参数从天线子集中选择天线。 在另一个实施例中，多个天线被施加到各个天线的独立信号处理路径，其中来自路径的输出然后被组合以增强接收机处的整体信号质量。
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