公开(公告)号：US07782806B2

公开(公告)日：2010-08-24

申请号：US11373607

申请日：2006-03-09

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： H04B7/00

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。

公开(公告)号：US20100150131A1

公开(公告)日：2010-06-17

申请号：US12509820

申请日：2009-07-27

申请人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

发明人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

IPC分类号： H04J3/00 ,  H04J3/06

CPC分类号： H04L23/02 ,  H04L5/0053 ,  H04L25/0206 ,  H04L25/0218 ,  H04L25/023 ,  H04L27/2613 ,  H04L27/2647

摘要： In a multicasts wireless telecommunication system providing an aggregation of one or more independent data components as a flow, wherein the OIS is located at the latch point of the beginning of the superframe, and the OIS programming is latched at the superframe boundary, the improvement of deriving signal parameter information from Signaling Parameter Channel (SPC) symbols transmitted in a Forward Link only (FLO) network by deriving a time domain channel estimate by assuming each of the combinations for the signal parameter field in the scrambler seed and picking the signal parameter combination that yields the most energy in the time domain above a threshold value.

摘要翻译： 在提供作为流的一个或多个独立数据组件的聚合的组播无线电信系统中，其中OIS位于超帧开始的锁存点处，并且OIS编程在超帧边界处被锁存， 通过通过假设加扰器种子中的信号参数字段的每个组合并且选择信号参数组合来导出时域信道估计，从​​在仅前向链路（FLO）网络中发送的信令参数信道（SPC）符号中导出信号参数信息 其在时域中产生的能量大于阈值以上。

公开(公告)号：US20050163258A1

公开(公告)日：2005-07-28

申请号：US11022513

申请日：2004-12-22

申请人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

发明人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

IPC分类号： H04L25/02 ,  H04L27/26 ,  H04B1/10

CPC分类号： H04L25/0224 ,  H04L25/0212 ,  H04L25/022

摘要： Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.

摘要翻译： 描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。 为了减轻多余延迟扩展的有害影响，利用时间滤波。 利用时间滤波来对付信道估计中的多余延迟扩散效应。 在存在交错导频的情况下执行时间滤波，并有助于在存在超延迟扩展的情况下改善信道估计。

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

IPC分类号： H04L12/18 ,  H04L12/56 ,  H04W74/04 ,  H04W88/08 ,  H04J3/24

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。

公开(公告)号：US09391751B2

公开(公告)日：2016-07-12

申请号：US12179505

申请日：2008-07-24

申请人： Ashok Mantravadi ,  Murali Ramaswamy Chari ,  Michael Mao Wang ,  Fuyun Ling ,  Rajiv Vijayan ,  Raghuraman Krishnamoorthi

发明人： Ashok Mantravadi ,  Murali Ramaswamy Chari ,  Michael Mao Wang ,  Fuyun Ling ,  Rajiv Vijayan ,  Raghuraman Krishnamoorthi

IPC分类号： H04B7/216 ,  H04L5/00 ,  H03M13/27 ,  H03M13/29 ,  H03M13/31 ,  H04L1/00 ,  H04L27/26

CPC分类号： H04L5/0044 ,  H03M13/271 ,  H03M13/2957 ,  H03M13/31 ,  H04L1/0066 ,  H04L1/0071 ,  H04L5/0007 ,  H04L5/0042 ,  H04L5/0064 ,  H04L27/2602 ,  H04L27/2634

摘要： A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved.

摘要翻译： 用于频率分集的系统和方法使用利用具有各种FFT大小的正交频分复用（OFDM）的无线通信系统中的交织。 一个或多个交错的子载波以位反向方式进行交织，并且所述一个或多个交错交织。

公开(公告)号：US20090279471A1

公开(公告)日：2009-11-12

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

发明人： Rajiv Vijayan ,  Fuyun Ling ,  Gordon Kent Walker ,  Ramaaswamy Murali ,  Ashok Mantravadi ,  Anand Subramaniam ,  Krishnamurthy Viswanathan

IPC分类号： H04H20/71 ,  H04L27/28

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。

公开(公告)号：US20090245154A1

公开(公告)日：2009-10-01

申请号：US12334436

申请日：2008-12-12

申请人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

发明人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Durk L. van Veen ,  Murali Ramaswamy Chari ,  Raghuraman Krishnamoorthi ,  Rajeev Krishnamurthi ,  Fuyun Ling

IPC分类号： H04H20/71 ,  H04J11/00

CPC分类号： H04L23/02 ,  H04L5/0053 ,  H04L25/0206 ,  H04L25/0218 ,  H04L25/023 ,  H04L27/2613 ,  H04L27/2647

摘要： In a multicasts wireless telecommunication system providing an aggregation of one or more independent data components as a flow, wherein the OIS is located at the latch point of the beginning of the superframe, and the OIS programming is latched at the superframe boundary, the improvement of deriving signal parameter information from Signaling Parameter Channel (SPC) symbols transmitted in a Forward Link only (FLO) network by deriving a time domain channel estimate by assuming each of the combinations for the signal parameter field in the scrambler seed and picking the signal parameter combination that yields the most energy in the time domain above a threshold value.

摘要翻译： 在提供作为流的一个或多个独立数据组件的聚合的组播无线电信系统中，其中OIS位于超帧开始的锁存点处，并且OIS编程在超帧边界处被锁存， 通过通过假设加扰器种子中的信号参数字段的每个组合并且选择信号参数组合来导出时域信道估计，从​​在仅前向链路（FLO）网络中发送的信令参数信道（SPC）符号中导出信号参数信息 其在时域中产生的能量大于阈值以上。

公开(公告)号：US20090028256A1

公开(公告)日：2009-01-29

申请号：US11834653

申请日：2007-08-06

申请人： Durk L. van Veen ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

发明人： Durk L. van Veen ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC分类号： H04L27/28

CPC分类号： H04L27/2613 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/008 ,  H04L5/0094 ,  H04L27/2607 ,  H04L27/2626 ,  H04L27/2628 ,  H04L27/2647 ,  H04L27/2656

摘要： A new channel is added to FLO networks that carries embedded signaling parameter information. The design is such that regardless of the actual values of the signaling parameters conveyed, a receiver will be able to demodulate this new channel. Moreover, the addition of the new channel does not render a FLO network that has been so configured to not be backwards-compatible with existing devices.

摘要翻译： 一个新的信道被添加到携带嵌入式信令参数信息的FLO网络中。 这种设计使得无论传达的信令参数的实际值如何，接收机将能够解调这个新的信道。 此外，添加新频道并不会使FLO网络被配置为不与现有设备向后兼容。

公开(公告)号：US20080186935A1

公开(公告)日：2008-08-07

申请号：US11933264

申请日：2007-10-31

申请人： Fuyun Ling ,  Murali Ramaswamy ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi

发明人： Fuyun Ling ,  Murali Ramaswamy ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi

IPC分类号： H04B7/216

CPC分类号： H04L5/003 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0039 ,  H04L5/0041 ,  H04L5/0053 ,  H04L5/0064 ,  H04L5/0094

摘要： Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.

公开(公告)号：US20080123540A1

公开(公告)日：2008-05-29

申请号：US11563627

申请日：2006-11-27

申请人： Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

发明人： Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

IPC分类号： H04J1/16

CPC分类号： H04B1/1027

摘要： Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).

摘要翻译： 通信系统中信号和干扰能量估计的方法和装置。 一方面，一种方法包括设置阈值，以及将信道估计与阈值进行比较，以确定干扰估计（I est）。 该方法还包括对干扰估计进行平均以确定平均信道干扰（I SUB），以及基于干扰估计（I）来确定干扰能量（I） ＆lt; SUB＆gt;）和平均信道干扰（I SUB）。 在另一方面，一种装置包括阈值逻辑，其配置成设置阈值并将信道估计与阈值进行比较以确定干扰估计（I est）。 所述装置包括被配置为平均干扰估计（I＆gt;）以确定平均信道干扰（I SUB）的平均逻辑，以及被配置为确定干扰能量（I） 基于干扰估计（I EST）和平均信道干扰（I SUB）。