公开(公告)号：US08532227B2

公开(公告)日：2013-09-10

申请号：US13378136

申请日：2010-06-28

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H03D3/22 ,  H04L27/22

CPC分类号： H04L1/0057 ,  H04L1/0004 ,  H04L1/0045 ,  H04L1/0072 ,  H04L27/38

摘要： Methods and apparatus for FEC frame header detection are provided, suitable for use in a DVB-C2 receiver. A first method comprises demodulating with a quadrature phase shift keying (QPSK) demapper, followed by correlation and symmetry measures for detection of a robust FEC header. A second method comprises demodulating with a 16 quadrature amplitude modulation (QAM) demapper, followed by correlation and symmetry measures for detection of a high efficiency FEC leader. Another embodiment comprises using both the first and second methods to find the FEC header because the first symbol of the FEC frame header may be sent either in robust mode or in high efficiency mode. There is also provided a method and apparatus for generating an alternate decision statistic for determining detection of the FEC frame header.

摘要翻译： 提供了用于FEC帧头检测的方法和装置，适用于DVB-C2接收机。 第一种方法包括使用正交相移键控（QPSK）解映射器进行解调，随后进行用于检测鲁棒FEC报头的相关和对称度量。 第二种方法包括利用16个正交幅度调制（QAM）解映射器进行解调，随后进行用于检测高效FEC前导码的相关和对称度量。 另一个实施例包括使用第一和第二方法来找到FEC报头，因为FEC帧报头的第一个符号可以以鲁棒模式或高效率模式发送。 还提供了一种用于生成用于确定FEC帧头的检测的替代判定统计量的方法和装置。

公开(公告)号：US20120274859A1

公开(公告)日：2012-11-01

申请号：US13514303

申请日：2010-02-09

申请人： Paul Gothard Knutson ,  Wen Gao ,  Benyuan Zhang ,  Hou-Shin Chen

发明人： Paul Gothard Knutson ,  Wen Gao ,  Benyuan Zhang ,  Hou-Shin Chen

IPC分类号： H04N5/38

CPC分类号： H04B1/0475 ,  H04L12/66 ,  H04N21/43615 ,  H04N21/43637 ,  H04W28/04

摘要： The invention relates to a wireless home gateway apparatus and methods of wirelessly delivering audio and/or video programs between a home gateway and a client device and to interference mitigation techniques on such system. Specifically, the invention relates to transmitting an audio video program on a first channel, receiving a control signal from a remote control indicating interference on said first channel, changing the transmission channel to a second channel, and transmitting data indicating said second channel to said remote control.

摘要翻译： 本发明涉及无线家庭网关设备和在家庭网关和客户端设备之间无线传送音频和/或视频节目的方法以及在这种系统上的干扰减轻技术。 具体地，本发明涉及在第一信道上发送音频视频节目，从遥控器接收指示对所述第一信道的干扰的控制信号，将传输信道改变为第二信道，以及向所述远端发送指示所述第二信道的数据 控制。

公开(公告)号：US20110317750A1

公开(公告)日：2011-12-29

申请号：US13138585

申请日：2010-03-12

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04B17/00

CPC分类号： H04L27/0006 ,  H04L5/0007

摘要： Methods and apparatuses for OFDM spectrum sensing are provided. The proposed spectrum sensing algorithms are based on Time-Domain Symbol Cross-Correlation (TDSC-MRC and TDSC-NP methods) and can be applied to all existing wireless OFDM systems. The statistical behaviors of the TDSC-based spectrum sensors are explicitly analyzed. In addition, the spectrum sensing method employing the Cyclic Prefix of the OFDM modulated signals (CP method) is described for comparison purposes. The DVB-T Standard is adopted as an application example to illustrate the proposed spectrum sensing algorithms. Simulation results show that the TDSC-MRC method outperforms the CP method for all values of CP ratio considered. The TDSC methods have the advantage that the detection performances are the same for different CP ratios, while the detection performance of the CP method degrades dramatically when the CP ratio becomes small.

摘要翻译： 提供了OFDM频谱感测的方法和装置。 所提出的频谱感知算法基于时域符号交叉相关（TDSC-MRC和TDSC-NP方法），并且可以应用于所有现有的无线OFDM系统。 明确分析了基于TDSC的频谱传感器的统计特性。 另外，为了进行比较，描述了使用OFDM调制信号的循环前缀的频谱感测方法（CP方法）。 采用DVB-T标准作为应用示例来说明所提出的频谱感知算法。 模拟结果表明，考虑到所有CP比值，TDSC-MRC方法优于CP方法。 TDSC方法的优点在于，对于不同的CP比，检测性能相同，而当CP比变小时，CP方法的检测性能显着降低。

公开(公告)号：US09237449B2

公开(公告)日：2016-01-12

申请号：US13514584

申请日：2009-12-21

申请人： Wen Gao ,  Hou-Shin Chen

发明人： Wen Gao ,  Hou-Shin Chen

IPC分类号： H04B1/18 ,  H04W16/10 ,  H04L27/10 ,  G06F3/033 ,  H04B1/16

CPC分类号： H04W16/10 ,  H04L27/10

摘要： A method and system for detection of available a white space channel in an area of licensed transmitters includes a detector which utilizes the autocorrelation analysis of a channel in an frequency modulated (FM) band. Calculation of the autocorrelation excludes an initial set of correlation delay values such that large values of autocorrelation are removed. The remaining autocorrelation based on higher correlation delay values exposes the sinusoidal nature of an FM transmitter operating in the selected channel. White space becomes available to a user if no transmitter is detected using the autocorrelation detection method.

摘要翻译： 用于在许可发射机的区域中检测可用的空白信道的方法和系统包括利用频率调制（FM）频带中的信道的自相关分析的检测器。 自相关的计算排除了初始的相关延迟值集合，从而消除了大的自相关值。 基于较高相关延迟值的剩余自相关显示在所选频道中操作的FM发射机的正弦特性。 如果没有使用自相关检测方法检测到发射机，则空白可用于用户。

公开(公告)号：US09191937B2

公开(公告)日：2015-11-17

申请号：US13702398

申请日：2011-06-22

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04W4/00 ,  H04W72/04 ,  H04W48/10 ,  H04W16/14

CPC分类号： H04W16/14 ,  H04W48/10 ,  H04W72/042 ,  H04W74/04

摘要： Methods and apparatus for access, enablement and control of devices in TV white space are provided. Methods and apparatus for channel scanning by a device are provided that shorten channel scanning time by using a 5 MHz Measurement Pilot frame at a predetermined location within an enabling device's channel, regardless of the operating bandwidth of the enabling device. Also provided are methods and apparatus for multi-band dynamic station enablement that locate information regarding an enabling device's supported regulatory classes and channel numbers within one accessible frame of information and also provide request and response messages to arrange for enablement of a requesting device on a network. Further, methods and apparatus are provided for identifying an interfering device on a network by providing increased information from within a DSE Registered Location element.

摘要翻译： 提供了电视空白设备访问，启用和控制的方法和设备。 提供了一种通过设备进行信道扫描的方法和装置，其通过在启用设备的信道内的预定位置处使用5MHz测量导频帧来缩短信道扫描时间，而不管启用设备的工作带宽如何。 还提供了用于多频段动态站启用的方法和装置，其在一个可访问的信息框架内定位关于启用设备的支持的监管类别和信道号的信息，并且还提供请求和响应消息以安排在网络上启用请求设备 。 此外，提供了通过从DSE注册位置元素内提供增加的信息来识别网络上的干扰设备的方法和装置。

公开(公告)号：US09185455B2

公开(公告)日：2015-11-10

申请号：US13577663

申请日：2011-02-16

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04W4/00 ,  H04N21/438 ,  H04N21/2381 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/4363 ,  H04N21/4402

CPC分类号： H04N21/4382 ,  H04N21/2381 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/43637 ,  H04N21/440218

摘要： A method and apparatus for using 802.11 Wireless LANs in TV white space are provided that additionally allows coexistence with non-802.11 devices in the same spectrum space. The method and apparatus extend concepts used in traditional 802.11 applications in the MAC and PHY layers so that WLANs can function over TV white space channels. The method and apparatus also facilitates coexistence of non 802.11 devices and existence with other 802.11 applications by extending the Enhanced Distributed Channel Access mechanism used to provide quality of service. An OFDM system with fixed subcarrier spacing is suggested to accommodate spectrum characteristics (variable center frequency and channel bandwidth) of the TVWS.

摘要翻译： 提供了一种在TV空白区域中使用802.11无线LAN的方法和装置，该方法和装置还允许与相同频谱空间中的非802.11设备共存。 该方法和装置扩展了在MAC和PHY层中传统802.11应用中使用的概念，使得WLAN可以在TV空白信道上运行。 该方法和装置还通过扩展用于提供服务质量的增强型分布式信道访问机制来促进非802.11设备的共存和与其他802.11应用的存在。 建议具有固定子载波间隔的OFDM系统以适应TVWS的频谱特性（可变中心频率和信道带宽）。

公开(公告)号：US08396166B2

公开(公告)日：2013-03-12

申请号：US12452112

申请日：2007-12-05

申请人： Wen Gao ,  Hou-Shin Chen

发明人： Wen Gao ,  Hou-Shin Chen

IPC分类号： H04L27/00

CPC分类号： H04W16/14 ,  H04B1/1027 ,  H04W48/16

摘要： A Wireless Regional Area Network (WRAN) receiver comprises a transceiver for communicating with a wireless network over one of a number of channels, and a signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which an Advanced Television Systems Committee (ATSC) DTV (digital television) broadcast signal was not detected. The signal detector performs spectrum sensing as a function of power spectral density (PSD) and cyclic spectrum.

摘要翻译： 无线区域网络（WRAN）接收机包括用于通过多个信道中的一个与无线网络通信的收发器，以及用于形成支持的频道列表的信号检测器，所述信道列表包括高级 电视系统委员会（ATSC）DTV（数字电视）广播信号未被检测到。 信号检测器执行频谱感测作为功率谱密度（PSD）和循环谱的函数。

公开(公告)号：US20120307817A1

公开(公告)日：2012-12-06

申请号：US13577663

申请日：2011-02-16

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04L27/04 ,  H04W84/12

CPC分类号： H04N21/4382 ,  H04N21/2381 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/43637 ,  H04N21/440218

摘要： A method and apparatus for using 802.11 Wireless LANs in TV white space are provided that additionally allows coexistence with non-802.11 devices in the same spectrum space. The method and apparatus extend concepts used in traditional 802.11 applications in the MAC and PHY layers so that WLANs can function over TV white space channels. The method and apparatus also facilitates coexistence of non 802.11 devices and existence with other 802.11 applications by extending the Enhanced Distributed Channel Access mechanism used to provide quality of service. An OFDM system with fixed subcarrier spacing is suggested to accommodate spectrum characteristics (variable center frequency and channel bandwidth) of the TVWS.

摘要翻译： 提供了一种在TV空白区域中使用802.11无线LAN的方法和装置，该方法和装置还允许与相同频谱空间中的非802.11设备共存。 该方法和装置扩展了在MAC和PHY层中传统802.11应用中使用的概念，使得WLAN可以在TV空白信道上运行。 该方法和装置还通过扩展用于提供服务质量的增强型分布式信道访问机制来促进非802.11设备的共存和与其他802.11应用的存在。 建议具有固定子载波间隔的OFDM系统以适应TVWS的频谱特性（可变中心频率和信道带宽）。

公开(公告)号：US08311163B2

公开(公告)日：2012-11-13

申请号：US12733571

申请日：2008-07-23

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04L27/06

CPC分类号： H04L7/08 ,  H04L7/041 ,  H04L7/043 ,  H04L27/2602 ,  H04L27/2656 ,  H04L27/2675

摘要： A DMB-T receiver supports a single carrier (SC) form of modulation and a multi-carrier form of modulation such as orthogonal frequency division multiplexing (OFDM). Upon receiving a broadcast signal, the DMB-T receiver downconverts the received broadcast signal to a received base-band signal and determines a frame number for each frame by correlating groups of the received symbols in adjacent signal frames. In particular, the receiver determines a maximum right-shift correlation value and a maximum left-shift correlation value. If the magnitude of the maximum right-shift correlation value is greater than, or equal to, the magnitude of the maximum left-shift correlation value, then the maximum right shift correlation value is used to retrieve a frame number from a look-up table. Otherwise, the negative value of the maximum left-shift correlation value is used to retrieve a frame number from the look-up table.

摘要翻译： DMB-T接收机支持单载波（SC）形式的调制和诸如正交频分复用（OFDM）的多载波调制形式。 在接收到广播信号时，DMB-T接收机将所接收的广播信号下变频为接收到的基带信号，并通过相邻信号帧中接收的符号组相关来确定每帧的帧号。 特别地，接收机确定最大右移相关值和最大左移相关值。 如果最大右移相关值的大小大于或等于最大左移相关值的幅度，则最大右移相关值用于从查找表中检索帧号 。 否则，最大左移相关值的负值用于从查找表中检索帧号。

公开(公告)号：US20120065911A1

公开(公告)日：2012-03-15

申请号：US13321052

申请日：2010-05-18

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： G01R23/16 ,  G06F19/00

CPC分类号： H04B17/382 ,  H04B17/26

摘要： Methods and apparatus for spectrum sensing for FM wireless microphone signals are provided. The spectrum sensing algorithm developed makes use of the property that the autocorrelation function of an FM signal is a sinusoidal function provided that the frequency) deviation is much smaller than the carrier frequency and the correlation delay is small. Based on this property, a simple spectrum sensing algorithm for the FM signal is designed by computing the autocorrelation function of the received signal and matched filtering of the sinusoidal function. The spectrum sensor provided by this approach can reliably detect the target signals when a strong adjacent channel interference exists and the signal power is as low as −114 dBm.

摘要翻译： 提供了FM无线麦克风信号的频谱感测方法和装置。 开发的频谱感知算法利用FM信号的自相关函数为正弦函数的性质，只要频率偏差远小于载波频率，相关延迟小。 基于该性质，通过计算接收信号的自相关函数和正弦函数的匹配滤波来设计FM信号的简单频谱感知算法。 当存在强相邻信道干扰并且信号功率低至-114dBm时，由该方法提供的频谱传感器可以可靠地检测目标信号。