利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

9 条记录 (耗时 0.031 秒)

    Digital broadcast service discovery correlation
    2.
    发明授权
    Digital broadcast service discovery correlation 有权
    数字广播服务发现相关

    公开(公告)号：US07787548B2

    公开(公告)日：2010-08-31

    申请号：US11686636

    申请日：2007-03-15

    申请人： Tommi Auranen ,  Harri J. Pekonen ,  Jussi Vesma ,  Pekka Talmola ,  Jukka Henriksson ,  Visa Koivunen ,  Jani Vare

    发明人： Tommi Auranen ,  Harri J. Pekonen ,  Jussi Vesma ,  Pekka Talmola ,  Jukka Henriksson ,  Visa Koivunen ,  Jani Vare

    IPC分类号： H04K1/10

    CPC分类号： H04L27/0012 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/2613 ,  H04L2001/0093

    摘要： Aspects of the invention are directed to service and channel discovery in a digital broadcast network. A pilot synchronization symbol, which has known characteristics, is included as a first symbol of digital broadcast frames. The pilot symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. So, the rest of the signal can be decoded without trial and error methods after the pilot symbol (and any additional synchronization symbols) is decoded. Channels containing digital video broadcast services can be efficiently detected using the known part of the signal. If the fixed known part is not found from the examined signal, then the signal will be considered a non-digital-video-broadcast signal or an empty channel, and the receiver can promptly proceed to a next channel/frequency. In this way, detecting non-digital-video-broadcast and empty channels becomes relatively fast.

    摘要翻译： 本发明的方面涉及数字广播网络中的服务和频道发现。 具有已知特征的导频同步符号被包括为数字广播帧的第一符号。 可以解码而无需诉诸试验和误差方法的导频符号包含信号其余部分的参数。 因此，在对导频符号（和任何附加的同步符号）进行解码之后，可以对信号的其余部分进行解码而无需尝试和错误的方法。 可以使用信号的已知部分有效地检测包含数字视频广播服务的信道。 如果从被检查的信号中没有找到固定的已知部分，则该信号将被认为是非数字视频广播信号或空信道，并且接收机可以迅速进行到下一个信道/频率。 以这种方式，检测非数字视频广播和空信道变得相对较快。

    Digital Broadcast Service Discovery Correlation
    3.
    发明申请
    Digital Broadcast Service Discovery Correlation 有权
    数字广播服务发现相关

    公开(公告)号：US20080225995A1

    公开(公告)日：2008-09-18

    申请号：US11686636

    申请日：2007-03-15

    申请人： Tommi Auranen ,  Harri J. Pekonen ,  Jussi Vesma ,  Pekka Talmola ,  Jukka Henriksson ,  Visa Koivunen ,  Jani Vare

    发明人： Tommi Auranen ,  Harri J. Pekonen ,  Jussi Vesma ,  Pekka Talmola ,  Jukka Henriksson ,  Visa Koivunen ,  Jani Vare

    IPC分类号： H04L27/06

    CPC分类号： H04L27/0012 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/2613 ,  H04L2001/0093

    摘要： Aspects of the invention are directed to service and channel discovery in a digital broadcast network. A pilot synchronization symbol, which has known characteristics, is included as a first symbol of digital broadcast frames. The pilot symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. So, the rest of the signal can be decoded without trial and error methods after the pilot symbol (and any additional synchronization symbols) is decoded. Channels containing digital video broadcast services can be efficiently detected using the known part of the signal. If the fixed known part is not found from the examined signal, then the signal will be considered a non-digital-video-broadcast signal or an empty channel, and the receiver can promptly proceed to a next channel/frequency. In this way, detecting non-digital-video-broadcast and empty channels becomes relatively fast.

    摘要翻译： 本发明的方面涉及数字广播网络中的服务和频道发现。 具有已知特征的导频同步符号被包括为数字广播帧的第一符号。 可以解码而无需诉诸试验和误差方法的导频符号包含信号其余部分的参数。 因此，在对导频符号（和任何附加的同步符号）进行解码之后，可以对信号的其余部分进行解码而无需尝试和错误的方法。 可以使用信号的已知部分有效地检测包含数字视频广播服务的信道。 如果从被检查的信号中没有找到固定的已知部分，则该信号将被认为是非数字视频广播信号或空信道，并且接收机可以迅速进行到下一个信道/频率。 以这种方式，检测非数字视频广播和空信道变得相对较快。

    Method and apparatus to select collaborating users in spectrum sensing
    5.
    发明授权
    Method and apparatus to select collaborating users in spectrum sensing 有权
    在频谱感知中选择合作用户的方法和装置

    公开(公告)号：US07949357B2

    公开(公告)日：2011-05-24

    申请号：US12001623

    申请日：2007-12-11

    申请人： Anu Huttunen ,  Niko Kiukkonen ,  Visa Koivunen

    发明人： Anu Huttunen ,  Niko Kiukkonen ,  Visa Koivunen

    IPC分类号： H04B7/00 ,  H04W72/00

    CPC分类号： H04W24/10 ,  H04W72/04

    摘要： In a first time interval TI a first frequency band FB is pseudorandomly selected from a designated spectrum, and a first analysis result is determined by sensing the first FB during the first TI and then transmitted. In a second TI a second FB is pseudorandomly selected from the designated spectrum, and a second analysis result is determined by sensing the second FB during the second TI and then transmitted. Where multiple devices do this the entire spectrum is sensed, each band by a subset of devices that changes at each TI, and so any unused or underutilized spectrum is searched by the collaborative spectrum sensing, which avoids propagation problems such as fading. Also, a central node can assure various collaborating users report different FBs in different TIs such that the subset of reporting users changes for at least one of the bands in each subsequent reporting TI. Sensing and communication can be performed in different portions of the same network defined transmission time interval.

    摘要翻译： 在第一时间间隔TI中，从指定频谱伪随机选择第一频带FB，并且通过在第一TI期间感测第一FB然后发送来确定第一分析结果。 在第二TI中，从指定频谱伪随机地选择第二FB，并且通过在第二TI期间感测第二FB然后发送来确定第二分析结果。 在多个设备进行此操作的情况下，将检测整个频谱，每个频带由在每个TI变化的设备子集，以及任何未使用或未充分利用的频谱进行搜索，通过协作频谱感测来进行搜索，从而避免传播问题，例如衰落。 此外，中央节点可以确保各种协作用户在不同TI中报告不同的FB，使得每个后续报告TI中的至少一个频带的报告用户的子集改变。 可以在相同网络定义的传输时间间隔的不同部分执行传感和通信。

    Correlation-based detection in a cognitive radio system
    6.
    发明授权
    Correlation-based detection in a cognitive radio system 有权
    认知无线电系统中的相关检测

    公开(公告)号：US08335474B2

    公开(公告)日：2012-12-18

    申请号：US12322255

    申请日：2009-01-30

    申请人： Anu Huttunen ,  Visa Koivunen ,  Jarmo Rafael Lundén

    发明人： Anu Huttunen ,  Visa Koivunen ,  Jarmo Rafael Lundén

    IPC分类号： H04B15/00

    CPC分类号： H04L5/0062

    摘要： A user equipment senses a plurality of wireless signals it receives; estimates cyclic correlation of the received signals using a multi-variate sign function; determines from the estimated cyclic correlation which ones of the signals are detected based on cyclostationarity present at known cyclic frequencies; and a frequency resource is selected for opportunistic communications based on the frequencies over which were received the signals that were determined to be detected. In specific embodiments, the multi-variate sign function is bivariate; the detected signals are primary user signals and the selected frequency resource avoids frequencies on which they were received; and/or the detected signals are secondary user signals and the selected frequency resource can either avoid those frequencies on which they were received or use those frequencies for the UE's own opportunistic communications.

    摘要翻译： 用户设备感测到其接收的多个无线信号; 使用多变量符号函数估计接收信号的循环相关; 根据估计的循环相关性确定基于在已知循环频率下存在的周期平稳性来检测哪些信号; 并且基于接收到被确定为被检测的信号的频率来选择用于机会通信的频率资源。 在具体实施例中，多变量符号函数是双变量的; 检测到的信号是主用户信号，所选择的频率资源避免了它们被接收的频率; 和/或检测到的信号是次要用户信号，并且所选择的频率资源可以避免它们被接收到的那些频率或者使用这些频率用于UE自己的机会性通信。

    System and method for blind estimation of multiple carrier frequency offsets and separation of user signals in wireless communications systems
    7.
    发明授权
    System and method for blind estimation of multiple carrier frequency offsets and separation of user signals in wireless communications systems 有权
    盲目估计无线通信系统中多载波频偏和用户信号分离的系统和方法

    公开(公告)号：US07929937B2

    公开(公告)日：2011-04-19

    申请号：US11923161

    申请日：2007-10-24

    申请人： Visa Koivunen ,  Athina Petropulu ,  H. Vincent Poor ,  Yuanning Yu

    发明人： Visa Koivunen ,  Athina Petropulu ,  H. Vincent Poor ,  Yuanning Yu

    IPC分类号： H04L27/00 ,  H04B1/10

    CPC分类号： H04L27/0014 ,  H04L25/0204 ,  H04L25/0238 ,  H04L2027/003

    摘要： A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix. A plurality of CFO estimates are obtained from the estimated system response conditions, and can be used by an equalizer to adjust receiver parameters in accordance with the CFO estimates so as to maximize reception quality and to extract multiple user signals from the received signal.

    摘要翻译： 提供了一种用于无线通信系统中载波频率偏移（CFO）盲目估计和用户信号分离的系统和方法。 执行CFO的盲目估计（即，不了解发射机或传输介质/信道的条件），以便通过无线通信设备改善接收质量。 接收的RF信号被预定义的过采样因子过采样，并且从过采样信号中提取多相分量。 多相分量用于构建虚拟接收机输出矩阵，例如接收信号的模型及其相关联的输出矩阵。 通过对虚拟接收机输出矩阵应用盲系统估计算法来盲目地估计系统响应条件。 从估计的系统响应条件获得多个CFO估计，并且可以由均衡器使用以根据CFO估计来调整接收机参数，以便最大化接收质量并从接收到的信号中提取多个用​​户信号。

    System and Method for Blind Estimation of Multiple Carrier Frequency Offsets and Separation of User Signals in Wireless Communications Systems
    8.
    发明申请
    System and Method for Blind Estimation of Multiple Carrier Frequency Offsets and Separation of User Signals in Wireless Communications Systems 有权
    用于无线通信系统中多载波频偏偏移估计和用户信号分离的系统和方法

    公开(公告)号：US20090111411A1

    公开(公告)日：2009-04-30

    申请号：US11923161

    申请日：2007-10-24

    申请人： Visa Koivunen ,  Athina Petropulu ,  H. Vincent Poor ,  Yuanning Yu

    发明人： Visa Koivunen ,  Athina Petropulu ,  H. Vincent Poor ,  Yuanning Yu

    IPC分类号： H04B17/00

    CPC分类号： H04L27/0014 ,  H04L25/0204 ,  H04L25/0238 ,  H04L2027/003

    摘要： A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix. A plurality of CFO estimates are obtained from the estimated system response conditions, and can be used by an equalizer to adjust receiver parameters in accordance with the CFO estimates so as to maximize reception quality and to extract multiple user signals from the received signal.

    摘要翻译： 提供了一种用于无线通信系统中载波频率偏移（CFO）盲目估计和用户信号分离的系统和方法。 执行CFO的盲目估计（即，不了解发射机或传输介质/信道的条件），以便通过无线通信设备改善接收质量。 接收的RF信号被预定义的过采样因子过采样，并且从过采样信号中提取多相分量。 多相分量用于构建虚拟接收机输出矩阵，例如接收信号的模型及其相关联的输出矩阵。 通过对虚拟接收机输出矩阵应用盲系统估计算法来盲目地估计系统响应条件。 从估计的系统响应条件获得多个CFO估计，并且可以由均衡器使用以根据CFO估计来调整接收机参数，以便最大化接收质量并从接收到的信号中提取多个用​​户信号。

    Method and apparatus to select collaborating users in spectrum sensing
    9.
    发明申请
    Method and apparatus to select collaborating users in spectrum sensing 有权
    在频谱感知中选择合作用户的方法和装置

    公开(公告)号：US20090149208A1

    公开(公告)日：2009-06-11

    申请号：US12001623

    申请日：2007-12-11

    申请人： Anu Huttunen ,  Niko Kiukkonen ,  Visa Koivunen

    发明人： Anu Huttunen ,  Niko Kiukkonen ,  Visa Koivunen

    IPC分类号： H04Q7/20 ,  H04B17/00

    CPC分类号： H04W24/10 ,  H04W72/04

    摘要： In a first time interval TI a first frequency band FB is pseudorandomly selected from a designated spectrum, and a first analysis result is determined by sensing the first FB during the first TI and then transmitted. In a second TI a second FB is pseudorandomly selected from the designated spectrum, and a second analysis result is determined by sensing the second FB during the second TI and then transmitted. Where multiple devices do this the entire spectrum is sensed, each band by a subset of devices that changes at each TI, and so any unused or underutilized spectrum is searched by the collaborative spectrum sensing, which avoids propagation problems such as fading. Also, a central node can assure various collaborating users report different FBs in different TIs such that the subset of reporting users changes for at least one of the bands in each subsequent reporting TI. Sensing and communication can be performed in different portions of the same network defined transmission time interval.

    摘要翻译： 在第一时间间隔TI中，从指定频谱伪随机选择第一频带FB，并且通过在第一TI期间感测第一FB然后发送来确定第一分析结果。 在第二TI中，从指定频谱伪随机地选择第二FB，并且通过在第二TI期间感测第二FB然后发送来确定第二分析结果。 在多个设备进行此操作的情况下，将检测整个频谱，每个频带由在每个TI变化的设备子集，以及任何未使用或未充分利用的频谱进行搜索，通过协作频谱感测来进行搜索，从而避免传播问题，例如衰落。 此外，中央节点可以确保各种协作用户在不同TI中报告不同的FB，使得每个后续报告TI中的至少一个频带的报告用户的子集改变。 可以在相同网络定义的传输时间间隔的不同部分执行传感和通信。