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41. 发明授权

US06999467B2 Method and apparatus for transmission and reception within an OFDM communication system 有权
标题翻译：用于OFDM通信系统内的发送和接收的方法和装置
公开(公告)号：US06999467B2
公开(公告)日：2006-02-14
申请号：US10628680
申请日：2003-07-28
申请人： Thomas P. Krauss , Kevin L. Baum , Vijay Nangia
发明人： Thomas P. Krauss , Kevin L. Baum , Vijay Nangia
IPC分类号： H04B7/216 , H04J11/00
CPC分类号： H04L5/0021 , H04L5/0048 , H04L25/0202
摘要： A staggered spread OFCDM scheme is utilized that improves channel estimation. In a first embodiment, each chip stream is time shifted by a predetermined amount and then transmitted on a predetermined subcarrier. This results in time-spread symbols being staggered (time-offset) on different subcarriers allowing for more frequent sampling of the channel. In a second embodiment a staggered spreading approach is applied in the frequency dimension to improve the performance of a system with spreading in the frequency dimension.
摘要翻译：利用交错的扩展OFCDM方案来改进信道估计。在第一实施例中，每个芯片流被时移一预定量，然后在预定的子载波上传输。这导致时间扩展符号在不同子载波上交错（时间偏移），允许更频繁地对信道进行采样。在第二实施例中，在频率维度中应用交错扩展方法以改善在频率维度上扩展的系统的性能。

42. 发明授权

US06959050B2 Method and apparatus for synchronizing an OFDM signal 有权
标题翻译： OFDM信号同步的方法和装置
公开(公告)号：US06959050B2
公开(公告)日：2005-10-25
申请号：US09882840
申请日：2001-06-15
申请人： Kevin L. Baum , Nikhil S. Nadgauda
发明人： Kevin L. Baum , Nikhil S. Nadgauda
IPC分类号： H04L7/06 , H04L27/00 , H04L27/26 , H04L27/14 , H04L27/06
CPC分类号： H04L27/2662 , H04L7/06 , H04L27/2659 , H04L27/266 , H04L27/2675 , H04L27/2679 , H04L2027/0036
摘要： An apparatus (300) for and method of synchronizing OFDM signals utilizes a single baud to provide synchronization in time, frequency, and per-subcarrier rotation (201). Timing and fractional subcarrier frequency synchronization may be obtained from either a known or unknown (e.g., data symbol) baud having known symmetry properties. Because all three synchronization tasks may be accomplished utilizing a single sync baud, the present invention is spectrally efficient. A differential correlation metric is utilized to efficiently provide integer subcarrier frequency synchronization and per-subcarrier rotation synchronization.
摘要翻译：用于OFDM信号同步的方法和方法利用一个波特率来提供时间，频率和每个副载波的同步（201）。定时和分数子载波频率同步可以从具有已知对称性质的已知或未知（例如，数据符号）波特获得。因为可以使用单个同步波特率来实现所有三个同步任务，所以本发明是光谱效率的。利用差分相关度量来有效地提供整体子载波频率同步和每子载波旋转同步。

43. 发明授权

US5740205A Apparatus and method for maximizing frequency offset tracking performance in a digital receiver 失效
标题翻译：用于使数字接收机中的频偏跟踪性能最大化的装置和方法
公开(公告)号：US5740205A
公开(公告)日：1998-04-14
申请号：US767173
申请日：1996-12-16
申请人： Kevin L. Baum , David Paul Gurney , Stephen Leigh Kuffner
发明人： Kevin L. Baum , David Paul Gurney , Stephen Leigh Kuffner
IPC分类号： H03J7/06 , H04L27/06
CPC分类号： H03J7/065
摘要： An automatic frequency control loop structure utilizes a dual selection automatic frequency control unit which is coupled to a differential phase unit and a coherent phase unit to provide a frequency corrected received signal output for efficient tracking of frequency offset drift; and a much lower probability of loss of automatic frequency control loop lock. Thus, a signal from a coherent carrier recovery process provides additional benefit by utilization in adjusting frequency offset tracking performance.
摘要翻译：自动频率控制环路结构利用双选择自动频率控制单元，其耦合到差分相位单元和相干相位单元，以提供频率校正的接收信号输出，用于有效跟踪频偏漂移; 并且自动频率控制回路锁定的丢失概率要低得多。因此，来自相干载波恢复过程的信号通过利用调整频偏跟踪性能提供额外的益处。

44. 发明授权

US5363412A Method and apparatus of adaptive maximum likelihood sequence estimation using filtered correlation synchronization 失效
标题翻译：使用滤波相关同步的自适应最大似然序列估计方法和装置
公开(公告)号：US5363412A
公开(公告)日：1994-11-08
申请号：US998063
申请日：1992-12-28
申请人： Robert T. Love , Gerald P. Labedz , Kevin L. Baum
发明人： Robert T. Love , Gerald P. Labedz , Kevin L. Baum
IPC分类号： H04L27/00 , H03H15/00 , H03H17/00 , H03H21/00 , H03M13/23 , H03M13/41 , H04B1/10 , H04B3/04 , H04B7/005 , H04L1/00 , H04L7/00 , H04L25/03 , H04L27/06 , H03M13/12
CPC分类号： H03M13/6331 , H03M13/41 , H04L25/03178 , H04L2025/03547 , H04L25/03292
摘要： A method and apparatus are provided for maximum likelihood sequence estimation. The method and apparatus includes a first maximum likelihood sequence estimator signal path for flat fading and an at least second maximum likelihood sequence estimator signal path for other than flat fading. The method and apparatus for further includes selecting the signal path with a least relative magnitude mean square error.
摘要翻译：提供了用于最大似然序列估计的方法和装置。该方法和装置包括用于平坦衰落的第一最大似然序列估计器信号路径和除平坦衰落以外的至少第二最大似然序列估计器信号路径。该方法和装置还包括以最小相对幅度均方误差选择信号路径。

45. 发明授权

US5233632A Communication system receiver apparatus and method for fast carrier acquisition 失效
标题翻译：用于快速载波采集的通信系统接收机装置和方法
公开(公告)号：US5233632A
公开(公告)日：1993-08-03
申请号：US698765
申请日：1991-05-10
申请人： Kevin L. Baum , David E. Borth , Phillip D. Rasky
发明人： Kevin L. Baum , David E. Borth , Phillip D. Rasky
IPC分类号： H04B1/30
CPC分类号： H04B1/30
摘要： A communications system receiver (100) is disclosed which receives a transmitted signal over a radio channel. The transmitted signal includes data and a predetermined synchronization sequence. The receiver (100) includes a demodulator (215), and a stored replica (207) of the predetermined synchronization sequence. The receiver (100) further includes apparatus (102) for computing (308) a reconstructed signal, by using the channel impulse response characteristic and the stored replica (207) of the synchronization sequence. A feature of the invention is to estimate (310) a phase offset value between an incoming signal and the reconstructed signal, for a plurality of synchronization symbols. This serves to establish (315) a relationship between the phase offset and a synchronization symbol index. The receiver then employs this relationship to derive (317) at least one "previous" phase state (214) for initializing (314) the demodulator (215).
摘要翻译：公开了一种通过无线电信道接收发射信号的通信系统接收机（100）。所发送的信号包括数据和预定的同步序列。接收器（100）包括解调器（215）和预定同步序列的存储副本（207）。接收器（100）还包括用于通过使用信道脉冲响应特性和存储的同步序列副本（207）来计算（308）重构信号的装置（102）。本发明的一个特征是针对多个同步符号来估计（310）输入信号和重构信号之间的相位偏移值。这用于建立（315）相位偏移和同步符号索引之间的关系。接收机然后采用这种关系来导出（317）用于初始化（314）解调器（215）的至少一个“先前”相位状态（214）。

46. 发明授权

US09438642B2 Methods for coordinating communications between a plurality of communication devices of a user 有权
标题翻译：用于协调用户的多个通信设备之间的通信的方法
公开(公告)号：US09438642B2
公开(公告)日：2016-09-06
申请号：US13461234
申请日：2012-05-01
申请人： William P. Alberth, Jr. , Kevin L. Baum , Dean E. Thorson
发明人： William P. Alberth, Jr. , Kevin L. Baum , Dean E. Thorson
IPC分类号： G06F15/16 , H04L29/06 , H04W4/02 , H04M3/42 , H04L29/08 , H04W4/20 , G06Q10/10 , H04L12/58
CPC分类号： H04L67/148 , G06Q10/10 , H04L51/14 , H04L51/20 , H04L65/1083 , H04L67/142 , H04L67/303 , H04M3/42263 , H04M3/42374 , H04M2203/2094 , H04W4/02 , H04W4/021 , H04W4/21
摘要： A communication device performs a method for coordinating communications between a plurality of communication devices of a user. The method includes detecting an active communication session on a primary communication device having user engagement, and determining a set of secondary communication devices in proximity to the user. The method further includes detecting an interruption event, at the primary communication device, during the active communication session. Additionally, the method includes determining that a first secondary communication device, in the set of secondary communication devices, has capability to process the interruption event, and transferring the interruption event to the first secondary communication device.
摘要翻译：通信装置执行用于协调用户的多个通信装置之间的通信的方法。该方法包括在具有用户参与的主通信设备上检测活动通信会话，以及确定邻近用户的一组辅助通信设备。该方法还包括在主通信会话期间在主通信设备处检测中断事件。此外，该方法包括确定该二次通信设备组中的第一次要通信设备具有处理该中断事件的能力，以及将该中断事件传送到该第一次要通信设备。

47. 发明授权

US09363126B2 Method and apparatus for IFDMA receiver architecture 有权
标题翻译：用于IFDMA接收机架构的方法和装置
公开(公告)号：US09363126B2
公开(公告)日：2016-06-07
申请号：US12336650
申请日：2008-12-17
申请人： Vijay Nangia , Kevin L. Baum , Margot Karam
发明人： Vijay Nangia , Kevin L. Baum , Margot Karam
IPC分类号： H04K1/10 , H04L27/26 , H04L5/00 , H04L25/03
CPC分类号： H04L27/2647 , H04B17/336 , H04L5/0007 , H04L25/03159 , H04L27/2626
摘要： A method and receiver for processing a composite signal (112) in a wireless communication system (100) is provided. The method includes receiving a composite signal (112) within a channel bandwidth, wherein the composite signal comprises one or more symbol streams (108, 110, 116) from a plurality of communication units (103, 104). The method also includes sampling the composite signal at a sampling rate, wherein the sampling rate comprises one of equal to a symbol rate of the composite signal or larger than the symbol rate of the composite signal. In addition, the method includes selecting a symbol sampling phase for each of the symbol streams from a plurality of communication units. The symbol streams from each of the communication units are aligned to produce an aligned composite signal by separating the symbol streams for each of the plurality of communication units and orthogonal recombining the symbol streams for each of the plurality of communication units based on the selected symbol sampling phase for each of the plurality of signals. The symbol streams are also separated based on the aligned composite signal.
摘要翻译：提供了一种在无线通信系统（100）中处理复合信号（112）的方法和接收器。该方法包括在信道带宽内接收复合信号（112），其中复合信号包括来自多个通信单元（103,104）的一个或多个符号流（108,110,116）。该方法还包括以采样率对复合信号进行采样，其中采样速率包括等于复合信号的符号速率或者大于复合信号的符号速率的一个。另外，该方法包括从多个通信单元中选择每个符号流的符号采样相位。通过分离多个通信单元中的每一个的符号流，对来自每个通信单元的符号流进行对齐以产生对准的复合信号，并且基于所选择的符号取样对每个通信单元的符号流进行正交重组对于多个信号中的每个信号的相位。基于对齐的复合信号，符号流也被分离。

48. 发明授权

US08767525B2 Method and apparatus for initial acquisition and cell search for an OFDMA system 有权
标题翻译：用于OFDMA系统的初始采集和小区搜索的方法和装置
公开(公告)号：US08767525B2
公开(公告)日：2014-07-01
申请号：US13183725
申请日：2011-07-15
申请人： Hidenori Akita , Kevin L. Baum , Brian K. Classon , Massaya Fukuta , Hiroshi Hayashi , Vijay Nangia , Robert T. Love , Kenneth A. Stewart
发明人： Hidenori Akita , Kevin L. Baum , Brian K. Classon , Massaya Fukuta , Hiroshi Hayashi , Vijay Nangia , Robert T. Love , Kenneth A. Stewart
IPC分类号： H04J11/00
CPC分类号： H04W48/16 , H04J11/0073 , H04L5/0007 , H04L27/2613 , H04L27/2655 , H04L27/2656 , H04L27/266 , H04L27/2663
摘要： A method and apparatus is provided for transmitting an orthogonal frequency domain multiple access (OFDMA) signal including a synchronization channel signal transmitted within a localized portion of a bandwidth of the OFDMA signal, the synchronization channel signal having predetermined time domain symmetry within the localized portion of the bandwidth and including information for providing at least partial cell identification information. The synchronization channel signal enables an initial acquisition and cell search method with low computational load which provides OFDMA symbol timing detection and frequency error detection and frame boundary detection and cell specific information detection in an OFDMA system supporting multiple system bandwidths, both synchronized and un-synchronized systems, a large cell index and an OFDMA symbol structure with both short and long cyclic prefix length.
摘要翻译：提供了一种用于发送包括在OFDMA信号的带宽的局部部分内发送的同步信道信号的正交频域多址（OFDMA）信号的方法和装置，所述同步信道信号在所述OFDMA信号的局部部分内部具有预定的时域对称性所述带宽并且包括用于提供至少部分小区识别信息的信息。同步信道信号能够实现具有低计算负荷的初始采集和小区搜索方法，其在支持多个系统带宽的同步和非同步的OFDMA系统中提供OFDMA符号定时检测和频率误差检测以及帧边界检测和小区特定信息检测系统，大的小区索引和具有短和长循环前缀长度的OFDMA符号结构。

49. 发明授权

US08509112B2 Method and apparatus for closed loop transmission 有权
标题翻译：闭环传动的方法和装置
公开(公告)号：US08509112B2
公开(公告)日：2013-08-13
申请号：US13486144
申请日：2012-06-01
申请人： Frederick W. Vook , Xiangyang Zhuang , Kevin L. Baum , Timothy A. Thomas
发明人： Frederick W. Vook , Xiangyang Zhuang , Kevin L. Baum , Timothy A. Thomas
IPC分类号： H04W4/00 , H04L12/26
CPC分类号： H04L5/0094 , H04L5/0023 , H04L5/0026 , H04L5/0051 , H04L25/0226 , H04L25/03343 , H04L27/2613 , H04L2025/03414 , H04L2025/03426 , H04L2025/03796 , H04L2025/03815 , H04W72/04
摘要： In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response.
摘要翻译：在无线通信系统中，公开了一种用于闭环传输的方法和装置。根据本发明的优选实施例，上行链路帧的时间频率部分被动态地保留作为用于上行链路信道探测的探测区域。在下行链路帧中向第一用户台发送第一消息，分配探测区域内的时间 - 频率资源和发声波形。此外，在所分配的时间 - 频率资源内从用户站接收信号，根据接收到的探测信号确定部分信道响应，并且基于至少部分信道响应来定制到用户站的后续传输。

50. 发明申请

US20120144445A1 METHOD AND APPARATUS FOR DISTRIBUTING VIDEO 有权
公开(公告)号：US20120144445A1
公开(公告)日：2012-06-07
申请号：US12959580
申请日：2010-12-03
申请人： Jeffrey D. Bonta , Kevin L. Baum , George Calcev , Benedito J. Fonseca, JR.
发明人： Jeffrey D. Bonta , Kevin L. Baum , George Calcev , Benedito J. Fonseca, JR.
IPC分类号： H04N7/173
CPC分类号： H04N21/6405 , H04L12/1868 , H04L65/1069 , H04L65/4076 , H04L65/602 , H04L65/608 , H04L65/80 , H04L67/02 , H04N21/2187 , H04N21/2358 , H04N21/26258 , H04N21/41407 , H04N21/6131 , H04N21/6375 , H04N21/6408 , H04N21/64784 , H04N21/8456
摘要： A method and apparatus for distributing live video to multiple client devices is provided herein. In particular, a router is provided that acts on behalf of all client devices in its network. The router serves multiple groups of client devices with each group being formed by client devices having similar bandwidth requirements. The router then requests and receives video chunks from a network. The router then redistributes the video chunks to the multiple client devices using a multicast transmission. In particular, to minimize the demands on the core network, the router sets up a separate multicast to each group. Live video, of the appropriate quality is then multicast to each group.

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