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51. 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。

52. 发明申请

US20070140322A1 Apparatus and methods for timing recovery in a wireless transceiver 有权
标题翻译：无线收发器中定时恢复的装置和方法
公开(公告)号：US20070140322A1
公开(公告)日：2007-06-21
申请号：US11303589
申请日：2005-12-15
申请人： Michael Wang , Bojan Vrcelj , Fuyun Ling , Rajiv Vijayan
发明人： Michael Wang , Bojan Vrcelj , Fuyun Ling , Rajiv Vijayan
IPC分类号： H04B1/00
CPC分类号： H04L27/2656 , H04L27/261 , H04L27/2675
摘要： Apparatus and methods for use in a wireless communication system are disclosed for recovery of timing tracking in a device, such as a wireless transceiver, after decoding errors occur due to incorrect timing tracking. In particular, the disclosed methods and apparatus recover timing tracking by monitoring a decoded signal in the transceiver for decoding errors occurring during a first frame, determining whether a number of decoding errors is greater than a predetermined amount, reacquiring a first pilot channel at a start of a subsequently received second frame when the number of decoding errors is determined to be greater than the predetermined amount, and resetting timing tracking of the transceiver based on the reacquired first pilot channel.
摘要翻译：在无线通信系统中使用的装置和方法被公开用于在诸如无线收发器的设备中恢复定时跟踪，在由于不正确的定时跟踪而导致解码错误之后。具体地，所公开的方法和装置通过监视收发器中的解码信号来恢复定时跟踪，以解码在第一帧期间发生的错误，确定解码错误的数量是否大于预定量，在开始时重新获取第一导频信道当确定解码错误的数量大于预定量时，随后接收到的第二帧，并且基于重新获取的第一导频信道来重置收发信机的定时跟踪。

53. 发明申请

US20060195752A1 Power saving method for coded transmission 有权
标题翻译：编码传输省电方式
公开(公告)号：US20060195752A1
公开(公告)日：2006-08-31
申请号：US11335013
申请日：2006-01-18
申请人： Gordon Walker , Chinnappa Ganapathy , Dhinak Radhakrishnan , Fuyun Ling , Rajiv Vijayan
发明人： Gordon Walker , Chinnappa Ganapathy , Dhinak Radhakrishnan , Fuyun Ling , Rajiv Vijayan
IPC分类号： H04L1/18
CPC分类号： H04L1/0053 , H04L1/0045 , H04L1/0057 , H04L1/0065 , H04L1/0071 , H04L1/0083
摘要： Conserving power for coded transmissions comprises ceasing to process parity packets once associated data packets are deemed correct or corrected. Once data packets are deemed correct or corrected, the receiving unit can shut off during the transmission of parity packets.
摘要翻译：编码传输的节省功率包括：一旦相关联的数据分组被认为是正确的或纠正的，停止处理奇偶分组。一旦数据分组被认为是正确的或纠正的，接收单元可以在传输奇偶分组期间关闭。

54. 发明申请

US20050122928A1 Local and wide-area transmissions in a wireless broadcast network 有权
标题翻译：无线广播网络中的本地和广域传输
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。

55. 发明申请

US20050058089A1 Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system 有权
标题翻译：在无线多载波通信系统中多路复用和传输多个数据流
公开(公告)号：US20050058089A1
公开(公告)日：2005-03-17
申请号：US10932586
申请日：2004-09-01
申请人： Rajiv Vijayan , Aamod Khandekar , Fuyun Ling , Gordon Walker , Ramaswamy Murali
发明人： Rajiv Vijayan , Aamod Khandekar , Fuyun Ling , Gordon Walker , Ramaswamy Murali
IPC分类号： H04H20/00 , H04J3/24 , H04L1/00 , H04L5/02 , H04L5/06 , H04L25/02 , H04L27/26 , H04W4/06 , H04W28/06 , H04W72/04
CPC分类号： H04W52/0209 , H04B7/12 , H04L1/0057 , H04L1/0065 , H04L1/0071 , H04L1/0083 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L5/0053 , H04L5/06 , H04L25/0224 , H04L27/2602 , H04N21/2383 , H04N21/4382 , H04N21/6112 , H04W4/06 , H04W28/06 , H04W72/04 , Y02D70/166 , Y02D70/168 , Y02D70/442
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.
摘要翻译：描述用于复用和传输多个数据流的技术。多个数据流的传输发生在“超帧”中。每个超帧具有预定的持续时间并进一步分为多个（例如，四个）帧。每个数据流的每个数据块被外部编码以生成相应的代码块。每个码块被划分成多个子块，并且每个码块中的每个数据分组被内部编码和调制以产生分组的调制符号。每个码块的多个子块在相同超帧的多个帧中传送，每帧一个子块。每个数据流在每个超帧中被分配多个传输单元，并被分配特定的传输单元以实现有效的打包。无线设备可以选择和接收各个数据流。

56. 发明申请

US20060245349A1 Collection window positioning using time tracking information 有权
标题翻译：收集窗口定位使用时间跟踪信息
公开(公告)号：US20060245349A1
公开(公告)日：2006-11-02
申请号：US11371837
申请日：2006-03-08
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Wang
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Wang
IPC分类号： H04J11/00
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 positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.
摘要翻译：公开了一种用于定位用于傅立叶变换函数的收集窗口的方法。接收第一正交频分复用（OFDM）符号和第二OFDM符号。第一OFDM符号包括多个频分复用（FDM）符号。第一OFDM符号的特征在于以下至少两个：延迟扩展，第一到达路径（FAP）或最后到达路径（LAP）。从信道脉冲响应估计信道位置。选择相对于通道位置的点。收集窗口的开始位于所选点处的第二OFDM符号。或者，如果延迟扩展小于预定长度，则使用第一算法在相对于信道位置的第一位置处选择点。如果延迟扩展大于预定长度，则使用第二算法在相对于信道位置的第二位置处选择所选择的点。

57. 发明申请

US20060123310A1 System and method for modulation diversity 有权
公开(公告)号：US20060123310A1
公开(公告)日：2006-06-08
申请号：US11192788
申请日：2005-07-29
申请人： Michael Wang , Fuyun Ling , Murali Chari , Rajiv Vijayan
发明人： Michael Wang , Fuyun Ling , Murali Chari , Rajiv Vijayan
IPC分类号： H03M13/00 , H04L1/00 , G08C25/00 , G06F11/00 , G06F11/30
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 modulation diversity uses interleaving. Code bits are placed into groups and are then shuffled within each group.

58. 发明授权

US08842619B2 Scalable frequency band operation in wireless communication systems 有权
标题翻译：无线通信系统中的可扩展频带操作
公开(公告)号：US08842619B2
公开(公告)日：2014-09-23
申请号：US13178357
申请日：2011-07-07
申请人： Aamod Dinkar Khandekar , Alexei Yurievitch Gorokhov , Avneesh Agrawal , Rajiv Vijayan , Edward Harrison Teague , Fatih Ulupinar
发明人： Aamod Dinkar Khandekar , Alexei Yurievitch Gorokhov , Avneesh Agrawal , Rajiv Vijayan , Edward Harrison Teague , Fatih Ulupinar
IPC分类号： H04Q7/00 , H04L27/26 , H04L5/02 , H04W48/12
CPC分类号： H04L5/023 , H04L27/2602 , H04W48/12
摘要： To support mobile stations that are not capable of demodulating the entire bandwidth or that can be made to demodulate less than the entire bandwidth, a system, apparatus and method are provided to schedule users on less than all of the bandwidth. Further, certain users can be scheduled on more of the bandwidth than others.
摘要翻译：为了支持不能解调整个带宽或者可以使其解调的小于整个带宽的移动站，提供了一种系统，装置和方法，以在小于全部带宽上调度用户。此外，某些用户可以比其他用户更多地调度带宽。

59. 发明授权

US08724555B2 Uplink pilot and signaling transmission in wireless communication systems 有权
标题翻译：无线通信系统中的上行链路导频和信令传输
公开(公告)号：US08724555B2
公开(公告)日：2014-05-13
申请号：US11418930
申请日：2006-05-04
申请人： Ranganathan Krishnan , Rajiv Vijayan , Tamer Kadous
发明人： Ranganathan Krishnan , Rajiv Vijayan , Tamer Kadous
IPC分类号： H04W4/00 , H04J11/00 , H04W74/00 , H04W72/04
CPC分类号： H04W74/004 , H04L5/0023 , H04L5/0041 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L25/0248 , H04W52/325 , H04W72/0413
摘要： Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.
摘要翻译：在OFDM系统中在上行链路上更有效地发送导频和信令的技术。通过子带复用，系统中的M个可用子带被划分成Q个不相关的子带组。每个子带组可被分配给用于上行链路导频传输的不同终端。多个终端可以在其分配的子带上同时发送。即使S代替M个子带用于每个终端的导频传输，导频的发射功率也可以按比例更高以获得相同的总导频能量。接收来自终端的导频传输，并且基于在所分配的子带上接收到的导频，为每个终端导出信道估计。信道估计包括对未分配组中的附加子带的响应。子带复用也可以用于上行链路信令传输。

60. 发明申请

US20100119005A1 RATE ADAPTIVE TRANSMISSION SCHEME FOR MIMO SYSTEMS 有权
标题翻译：用于MIMO系统的速率自适应传输方案
公开(公告)号：US20100119005A1
公开(公告)日：2010-05-13
申请号：US12690307
申请日：2010-01-20
申请人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
发明人： Avneesh Agrawal , Rajiv Vijayan , Tamer Kadous
IPC分类号： H04B7/02
CPC分类号： H04L1/0618 , H04B7/0417 , H04B7/0443 , H04B7/0465 , H04B7/0615 , H04B7/0891 , H04W52/34 , H04W52/42
摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.
摘要翻译：可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。在一种方法中，接收至少一个数据符号流用于从多个天线发射。每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

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