公开(公告)号：US08027395B2

公开(公告)日：2011-09-27

申请号：US11935316

申请日：2007-11-05

申请人： Ramakrishna Akella ,  Roger Cheng

发明人： Ramakrishna Akella ,  Roger Cheng

IPC分类号： H04L27/28

CPC分类号： H04L25/0234 ,  H04L25/0204 ,  H04L25/022 ,  H04L27/2647

摘要： A method for performing channel estimation of an OFDM channel includes, in part, interpolating pilots for sub-channels positioned within a first range of an OFDM symbol, and estimating frequency response of sub-channels positioned within a second range of the OFDM symbol. The first range is defined by subchannels positioned substantially away from channel edges and the second range is defined by subchannels positioned substantially near channel edges. The method optionally includes transforming the pilots from frequency domain into the time-domain, time-domain windowing to obtain a channel impulse response having a multitude of discrete values, estimating the discrete values within the channel impulse response; and transforming the channel impulse response to the frequency domain.

摘要翻译： 用于执行OFDM信道的信道估计的方法部分地包括针对位于OFDM符号的第一范围内的子信道内插导频，以及估计位于OFDM符号的第二范围内的子信道的频率响应。 第一范围由基本上远离通道边缘定位的子通道限定，第二范围由基本上位于通道边缘附近的子​​通道定义。 该方法可选地包括将导频从频域变换为时域，时域窗口，以获得具有多个离散值的信道脉冲响应，估计信道脉冲响应内的离散值; 并将信道脉冲响应变换到频域。

公开(公告)号：US07876726B2

公开(公告)日：2011-01-25

申请号：US10405020

申请日：2003-04-01

申请人： Ramakrishna Akella ,  Yan Hui

发明人： Ramakrishna Akella ,  Yan Hui

IPC分类号： H04Q7/00

CPC分类号： H04L27/18

摘要： System and method for adaptively allocating channels to subchannels and maintain balance on the subchannels. A preferred embodiment comprises an assignment unit (for example, assignment algorithm unit 717) that receives call/connection requests from a call/connection processing unit (for example, call/connection processing unit 712). The assignment unit may use a lookup table or channel metrics to determine an allocation for the call/connection to maintain a balance across the subchannels. The assignment unit may allocate only the call/connection in the request or it may allocate the call/connection in the request plus the calls/connections that are already allocated to achieve balance.

摘要翻译： 用于自适应地将子频道分配给子信道并在子信道上保持平衡的系统和方法。 优选实施例包括从呼叫/连接处理单元（例如，呼叫/连接处理单元712）接收呼叫/连接请求的分配单元（例如，分配算法单元717）。 分配单元可以使用查找表或信道度量来确定呼叫/连接的分配以维持子信道之间的平衡。 分配单元可以仅在请求中分配呼叫/连接，或者可以在请求中分配呼叫/连接加上已经被分配以实现平衡的呼叫/连接。

公开(公告)号：US08973070B2

公开(公告)日：2015-03-03

申请号：US12036949

申请日：2008-02-25

申请人： Sridhar Ramesh ,  Curtis Ling ,  Ramakrishna Akella ,  Brenndon Lee

发明人： Sridhar Ramesh ,  Curtis Ling ,  Ramakrishna Akella ,  Brenndon Lee

IPC分类号： H04N7/173 ,  H04H60/43 ,  H04H20/26 ,  H04N21/414 ,  H04N21/438 ,  H04H20/40 ,  H04H60/11

CPC分类号： H04H60/43 ,  H04H20/26 ,  H04H20/40 ,  H04H60/11 ,  H04N21/41407 ,  H04N21/4384

摘要： A wireless communication system is enhanced to allow for low-latency channel surfing and to enable a user to quickly see the content carried over a selected channel while searching channels for desired content. The techniques for reducing the channel change latency may be implemented in a transmitter, receiver, or in a combination of transmitter and receiver. The wireless communication system is optionally a DVB-H communication system. The transmitter may generate and transmit one or more auxiliary channels, where each auxiliary channel contains reduced resolution content corresponding to one or more channels. The receiver may process the one or more auxiliary channels to present the reduced resolution content while processing the full resolution channel for display. The receiver caches portions of content from one or more non-selected channels and presents the cached content when the channel is selected while concurrently searching and processing the full resolution channel content.

摘要翻译： 增强无线通信系统以允许低等待时间的信道冲浪，并且使得用户能够在搜索频道寻找所需内容的同时快速查看通过所选频道载入的内容。 用于减少信道改变等待时间的技术可以在发射机，接收机或发射机和接收机的组合中实现。 无线通信系统可选地是DVB-H通信系统。 发射机可以生成和发送一个或多个辅助信道，其中每个辅助信道包含对应于一个或多个信道的降低的分辨率内容。 接收机可以处理一个或多个辅助信道以呈现降低的分辨率内容，同时处理用于显示的全分辨率信道。 接收器从一个或多个非选择的信道缓存部分内容，并且在同时搜索和处理全分辨率信道内容的同时选择信道时呈现缓存的内容。

公开(公告)号：US09092802B1

公开(公告)日：2015-07-28

申请号：US13586310

申请日：2012-08-15

申请人： Ramakrishna Akella

发明人： Ramakrishna Akella

IPC分类号： G06N5/00 ,  G06F1/00 ,  G06Q30/02

CPC分类号： G06Q30/0256 ,  G06F17/2735 ,  G06F17/2785 ,  G06F17/2795 ,  G06F17/30731 ,  G06N7/005 ,  G06N99/005

摘要： Methods and systems for knowledge extraction that involve providing analytics and blending the analytics with analysis of one or more knowledge processes are provided. Knowledge extraction may be based on combining analytic approaches, such as statistical and machine learning approaches. Unstructured data, such as numerical, geo-spatial, text, speech, image, video, data, and music, may be used as input for these processes. The methods and systems may convert this unstructured data into a structured knowledge that has some specific utility to its user. Some embodiments may involve service requests delivery, information and knowledge extraction, information and knowledge retrieval, media mining, marketing, and other uses. Different granularity levels of knowledge and information extraction may be provided. This differentiation may be used for monetization of the service.

摘要翻译： 提供了涉及提供分析和混合分析以及一个或多个知识过程分析的知识提取的方法和系统。 知识提取可以基于综合分析方法，如统计学和机器学习方法。 可以将非结构化数据（例如数字，地理空间，文本，语音，图像，视频，数据和音乐）用作这些过程的输入。 方法和系统可以将非结构化数据转换成对其用户具有一些特定效用的结构化知识。 一些实施例可以涉及服务请求传递，信息和知识提取，信息和知识检索，媒体挖掘，营销和其他用途。 可以提供不同的知识和信息提取的粒度级别。 这种差异可能用于服务的获利。

公开(公告)号：US08373804B2

公开(公告)日：2013-02-12

申请号：US12184652

申请日：2008-08-01

申请人： Curtis Ling ,  Patrick Tierney ,  Ramakrishna Akella

发明人： Curtis Ling ,  Patrick Tierney ,  Ramakrishna Akella

IPC分类号： H04N5/455 ,  H04N5/50

CPC分类号： H04N5/50 ,  H04N5/4401 ,  H04N5/4446 ,  H04N5/455 ,  H04N21/4263 ,  H04N21/43632 ,  H04N21/4382 ,  H04N21/443

摘要： A tuner includes, in part, one or mixers, one or more filters, one or more variable gain stages, one or more analog to digital converters, and a baseband processor. Each filter is responsive to an associated mixer's output signal. Each variable gain stage is responsive to an associated filter's output. Each analog-to-digital converter is adapted to convert the output signal of an associated variable gain stage to a digital signal. The baseband processor is responsive to the digital signal supplied by the analog-to-digital converter(s). The baseband processor is further configured to supply a signal to be demodulated by a processing unit external to the integrated circuit. The baseband processor performs no or a fraction of the required demodulation functions. The processing unit may be a central processing unit or a graphical processing unit.

摘要翻译： 调谐器部分地包括一个或者混频器，一个或多个滤波器，一个或多个可变增益级，一个或多个模数转换器和基带处理器。 每个滤波器响应于相关混频器的输出信号。 每个可变增益级都响应相关过滤器的输出。 每个模拟 - 数字转换器适于将相关联的可变增益级的输出信号转换为数字信号。 基带处理器响应由模数转换器提供的数字信号。 基带处理器还被配置为提供要由集成电路外部的处理单元解调的信号。 基带处理器执行所需解调功能的任何部分或一部分。 处理单元可以是中央处理单元或图形处理单元。

公开(公告)号：US20090040391A1

公开(公告)日：2009-02-12

申请号：US12184652

申请日：2008-08-01

申请人： Curtis Ling ,  Patrick Tierney ,  Ramakrishna Akella

发明人： Curtis Ling ,  Patrick Tierney ,  Ramakrishna Akella

IPC分类号： H04N5/50 ,  H04N5/455

CPC分类号： H04N5/50 ,  H04N5/4401 ,  H04N5/4446 ,  H04N5/455 ,  H04N21/4263 ,  H04N21/43632 ,  H04N21/4382 ,  H04N21/443

摘要： A tuner includes, in part, one or mixers, one or more filters, one or more variable gain stages, one or more analog to digital converters, and a baseband processor. Each filter is responsive to an associated mixer's output signal. Each variable gain stage is responsive to an associated filter's output. Each analog-to-digital converter is adapted to convert the output signal of an associated variable gain stage to a digital signal. The baseband processor is responsive to the digital signal supplied by the analog-to-digital converter(s). The baseband processor is further configured to supply a signal to be demodulated by a processing unit external to the integrated circuit. The baseband processor performs no or a fraction of the required demodulation functions. The processing unit may be a central processing unit or a graphical processing unit.

摘要翻译： 调谐器部分地包括一个或者混频器，一个或多个滤波器，一个或多个可变增益级，一个或多个模数转换器和基带处理器。 每个滤波器响应于相关混频器的输出信号。 每个可变增益级都响应相关过滤器的输出。 每个模拟 - 数字转换器适于将相关联的可变增益级的输出信号转换为数字信号。 基带处理器响应于由模数转换器提供的数字信号。 基带处理器还被配置为提供要由集成电路外部的处理单元解调的信号。 基带处理器执行所需解调功能的任何部分或一部分。 处理单元可以是中央处理单元或图形处理单元。

公开(公告)号：US20080209499A1

公开(公告)日：2008-08-28

申请号：US12036949

申请日：2008-02-25

申请人： Sridhar Ramesh ,  Curtis Ling ,  Ramakrishna Akella ,  Brenndon Lee

发明人： Sridhar Ramesh ,  Curtis Ling ,  Ramakrishna Akella ,  Brenndon Lee

IPC分类号： H04N7/16

CPC分类号： H04H60/43 ,  H04H20/26 ,  H04H20/40 ,  H04H60/11 ,  H04N21/41407 ,  H04N21/4384

摘要： A wireless communication system is enhanced to allow for low-latency channel surfing and to enable a user to quickly see the content carried over a selected channel while searching channels for desired content. The techniques for reducing the channel change latency may be implemented in a transmitter, receiver, or in a combination of transmitter and receiver. The wireless communication system is optionally a DVB-H communication system. The transmitter may generate and transmit one or more auxiliary channels, where each auxiliary channel contains reduced resolution content corresponding to one or more channels. The receiver may process the one or more auxiliary channels to present the reduced resolution content while processing the full resolution channel for display. The receiver caches portions of content from one or more non-selected channels and presents the cached content when the channel is selected while concurrently searching and processing the full resolution channel content.

摘要翻译： 增强无线通信系统以允许低等待时间的信道冲浪，并且使得用户能够在搜索频道寻找所需内容的同时快速查看通过所选频道载入的内容。 用于减少信道改变等待时间的技术可以在发射机，接收机或发射机和接收机的组合中实现。 无线通信系统可选地是DVB-H通信系统。 发射机可以生成和发送一个或多个辅助信道，其中每个辅助信道包含对应于一个或多个信道的降低的分辨率内容。 接收机可以处理一个或多个辅助信道以呈现降低的分辨率内容，同时处理用于显示的全分辨率信道。 接收器从一个或多个非选择的信道缓存部分内容，并且在同时搜索和处理全分辨率信道内容的同时选择信道时呈现缓存的内容。

公开(公告)号：US07412238B2

公开(公告)日：2008-08-12

申请号：US10603353

申请日：2003-06-25

申请人： Yan Hui ,  Ramakrishna Akella

发明人： Yan Hui ,  Ramakrishna Akella

IPC分类号： H04Q7/20

CPC分类号： H04W48/12 ,  H04W52/0216 ,  H04W52/0245 ,  Y02D70/1242 ,  Y10S370/913

摘要： System and method for efficiently detecting packet format from a control channel. A preferred embodiment comprises the use of a slot counter (for example, slot counter 1310) to count the number of slots received (perhaps at a buffer, such as buffer 1305) since the last successfully demodulated packet. Using the slot counter, the number of demodulation attempts can be reduced. For example, if slot counter is one, then a single slot format decode is attempted. If slot counter is two, then a single and dual slot format decode is attempted. Additionally, channel quality can be used to determine likely channel formats. Furthermore, when multiple control channels are used, decoding information regarding one control channel can assist in determining the slot format of another.

摘要翻译： 用于从控制信道有效地检测分组格式的系统和方法。 优选实施例包括使用时隙计数器（例如，时隙计数器1310）来计数自上一个成功解调的分组之后接收的时隙的数量（可能在缓冲器，例如缓冲器1305）。 使用时隙计数器，可以减少解调尝试次数。 例如，如果时隙计数器为1，则尝试单槽格式解码。 如果槽位计数器为2，则尝试单槽和双槽格式解码。 另外，可以使用信道质量来确定可能的信道格式。 此外，当使用多个控制信道时，关于一个控制信道的解码信息可以有助于确定另一控制信道的时隙格式。

公开(公告)号：US20080144730A1

公开(公告)日：2008-06-19

申请号：US11935316

申请日：2007-11-05

申请人： Ramakrishna Akella ,  Roger Cheng

发明人： Ramakrishna Akella ,  Roger Cheng

IPC分类号： H04L27/28

CPC分类号： H04L25/0234 ,  H04L25/0204 ,  H04L25/022 ,  H04L27/2647

摘要： A method for performing channel estimation of an OFDM channel includes, in part, interpolating pilots for sub-channels positioned within a first range of an OFDM symbol, and estimating frequency response of sub-channels positioned within a second range of the OFDM symbol. The first range is defined by subchannels positioned substantially away from channel edges and the second range is defined by subchannels positioned substantially near channel edges. The method optionally includes transforming the pilots from frequency domain into the time-domain, time-domain windowing to obtain a channel impulse response having a multitude of discrete values, estimating the discrete values within the channel impulse response; and transforming the channel impulse response to the frequency domain.

摘要翻译： 用于执行OFDM信道的信道估计的方法部分地包括针对位于OFDM符号的第一范围内的子信道内插导频，以及估计位于OFDM符号的第二范围内的子信道的频率响应。 第一范围由基本上远离通道边缘定位的子通道限定，第二范围由基本上位于通道边缘附近的子​​通道定义。 该方法可选地包括将导频从频域变换为时域，时域窗口，以获得具有多个离散值的信道脉冲响应，估计信道脉冲响应内的离散值; 并将信道脉冲响应变换到频域。