公开(公告)号：US08867634B2

公开(公告)日：2014-10-21

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： H04K1/10 ,  H04L27/00 ,  H04L5/00

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：US20130148639A1

公开(公告)日：2013-06-13

申请号：US13817560

申请日：2010-08-26

申请人： Wen Gao ,  Hou-Shin Chen

发明人： Wen Gao ,  Hou-Shin Chen

IPC分类号： H04W72/04

CPC分类号： H04W72/0446 ,  H04J3/0641 ,  H04J3/0673 ,  H04W16/14 ,  H04W36/0061 ,  H04W48/10 ,  H04W48/16 ,  H04W56/0015 ,  H04W56/002 ,  H04W72/044 ,  H04W84/12 ,  H04W88/08

摘要： A method and apparatus are described including defining a neighbor set for each access point, selecting a first clock in a first access point, the selected clock having a highest accuracy as a grand master clock, advising neighboring access points to synchronize with the selected grand master clock and transmitting a message to schedule a quiet period based on the grand master clock. Also described are a method and apparatus including receiving a beacon message, inspecting clock descriptors in the beacon message, selecting a best master clock responsive to the inspection and transmitting a message to schedule a quiet period based on the selected best master clock.

摘要翻译： 描述了一种方法和装置，包括为每个接入点定义邻居集合，在第一接入点中选择第一时钟，所选择的时钟具有最高精度作为大主时钟，建议相邻接入点与所选择的大主机同步 时钟，并发送消息，以根据大主时钟安排安静时段。 还描述了一种方法和装置，包括接收信标消息，检查信标消息中的时钟描述符，响应于检查选择最佳主时钟，并发送消息以基于所选择的最佳主时钟来安排安静时段。

公开(公告)号：US08433006B2

公开(公告)日：2013-04-30

申请号：US12452629

申请日：2007-12-06

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L27/2647

摘要： An apparatus comprises a downconverter for providing a signal that may be a received orthogonal frequency division multiplexed (OFDM) symbols from a selected channel, each OFDM symbol comprising N subcarriers at least some of which are pilot subcarriers; and a processor that (a) correlates the received OFDM symbols for providing at least one correlated value, (b) generates a metric value as a function of the at least one correlated value and (b) compares the metric value to a threshold value for detecting if an incumbent signal is present.

摘要翻译： 一种装置包括下变频器，用于提供可以是来自所选信道的接收的正交频分复用（OFDM）符号的信号，每个OFDM符号包括N个子载波，其中至少一些是导频子载波; （a）使所接收的OFDM符号相关联以提供至少一个相关值，（b）生成作为所述至少一个相关值的函数的度量值，以及（b）将度量值与阈值进行比较，以便 检测是否存在现有信号。

公开(公告)号：US20120238227A1

公开(公告)日：2012-09-20

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： H04B1/04

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：US08238830B2

公开(公告)日：2012-08-07

申请号：US12449078

申请日：2007-06-20

申请人： Wen Gao ,  Hou-Shin Chen

发明人： Wen Gao ,  Hou-Shin Chen

IPC分类号： H04B1/00 ,  H04B15/00

CPC分类号： H04L7/042 ,  H04L7/06 ,  H04N5/50 ,  H04N21/4383

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 an Advanced Television Systems Committee (ATSC) signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which an ATSC signal was not detected. The ATSC signal detector comprises a matched filter that matches to at least a modulated version of an ATSC field sync signal for detecting the presence of an incumbent ATSC broadcast signal.

摘要翻译： 无线区域网络（WRAN）接收机包括用于通过多个信道之一与无线网络进行通信的收发机，以及用于形成支持的频道列表的高级电视系统委员会（ATSC）信号检测器，其包括 没有检测到ATSC信号的通道数。 ATSC信号检测器包括与ATSC场同步信号的至少调制版本匹配的匹配滤波器，用于检测在线ATSC广播信号的存在。

公开(公告)号：US20110002418A1

公开(公告)日：2011-01-06

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： H04L7/00 ,  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：US20100134699A1

公开(公告)日：2010-06-03

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： H04N5/50 ,  H04L27/06

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：US20100086074A1

公开(公告)日：2010-04-08

申请号：US12449761

申请日：2007-06-20

申请人： Hou-Shin Chen ,  Wen Gao

发明人： Hou-Shin Chen ,  Wen Gao

IPC分类号： H04L1/02 ,  H04N7/173 ,  H04L27/00

CPC分类号： H04L27/2647 ,  H04L27/0012 ,  H04L27/2602

摘要： A Wireless Regional Area Network (WRAN) endpoint comprises a transceiver for communicating with a wireless network over one of a number of channels, and a DVB-T (Digital Video Broadcast-Terrestrial) signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which a DVB-T signal was not detected. The WRAN endpoint processes a received signal to provide two data segments and determines an average of the autocorrelation of the two data segments at each one of eight transmission modes for the DVB-T signal. The WRAN endpoint then determines if a DVB-T signal is present as a function of the largest average autocorrelation value.

摘要翻译： 无线区域网络（WRAN）端点包括用于通过多个信道之一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DVB-T（数字视频广播地面）信号检测器，其包括 没有检测到DVB-T信号的频道数量。 WRAN端点处理接收信号以提供两个数据段，并确定DVB​​-T信号的八个传输模式中的每一个处的两个数据段的自相关的平均值。 然后，WRAN端点确定DVB​​-T信号是否作为最大平均自相关值的函数存在。

公开(公告)号：US20100045876A1

公开(公告)日：2010-02-25

申请号：US12448487

申请日：2007-06-20

申请人： Wen Gao ,  Hou-Shin Chen

发明人： Wen Gao ,  Hou-Shin Chen

IPC分类号： H04N5/50

CPC分类号： H04N5/44 ,  H04N21/41407 ,  H04N21/4382

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) signal was not detected. The WRAN receiver performs a method comprising the steps of: dividing a total observation time looking for an ATSC data segment sync signal into multiple slices; computing at least one statistic for each slice; computing at least one overall statistic from the statistics computed for each slice; determining if the at least one overall statistic is greater than a threshold; and if the overall statistic is greater than the threshold, determining that an ATSC signal is present, otherwise, determining that an ATSC signal is not present.

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 没有发现电视系统委员会（ATSC）信号。 WRAN接收机执行一种方法，包括以下步骤：将寻找ATSC数据段同步信号的总观测时间除以多个片; 计算每个切片的至少一个统计量; 从为每个切片计算的统计信息计算至少一个总体统计量; 确定所述至少一个总统计是否大于阈值; 并且如果总体统计量大于阈值，则确定存在ATSC信号，否则确定不存在ATSC信号。

公开(公告)号：US09793931B2

公开(公告)日：2017-10-17

申请号：US13520382

申请日：2010-01-15

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： H04W16/14 ,  H04B1/04 ,  H04L12/66 ,  H04N21/436 ,  H04N21/4363 ,  H04W28/04

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 and mitigating interference thereon. Specifically, the present invention relates to transmitting an audio/video program on two white space channels and alternately stopping transmission on one of said channels to search for external transmissions on the white space channel. The present invention permits the wireless home gateway to continuously transmit an audio/video program to a client while periodically searching for transmitters on each of the white space channels.