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    FREQUENCY OFFSET CORRECTION FOR AN ULTRAWIDEBAND COMMUNICATION SYSTEM
    1.
    发明申请
    FREQUENCY OFFSET CORRECTION FOR AN ULTRAWIDEBAND COMMUNICATION SYSTEM 有权
    用于超宽带通信系统的频率偏移校正

    公开(公告)号：US20070268976A1

    公开(公告)日：2007-11-22

    申请号：US11696113

    申请日：2007-04-03

    申请人： Stephan Brink ,  Ravishankar Mahadevappa

    发明人： Stephan Brink ,  Ravishankar Mahadevappa

    IPC分类号： H04L27/28

    CPC分类号： H04B1/7183

    摘要： A method and a receiver system for subcarrier-specific frequency offset correction including frequency offset estimation, updating and compensation. The method includes initial frequency offset estimation in time domain using packet preamble, frequency offset compensation during channel estimation symbols using the initial frequency offset estimate, and frequency offset update tracking during header and data part both being performed in the frequency domain. The initial frequency offset estimation includes using a sum over a number of time lagged autocorrelation results, corresponding to a number of the last consecutive symbols of the preamble part of the packet with the autocorrelations being the result of a sum over a window of cross-correlations between the incoming signal and the respective packet synchronization sequence. The receiver includes receiver blocks for initial frequency offset estimation, frequency offset compensation, frequency offset update tracking and obtaining a current frequency offset estimate.

    摘要翻译： 一种用于子载波特定频偏校正的方法和接收机系统，包括频偏估计，更新和补偿。 该方法包括使用分组前导码的时域中的初始频率偏移估计，使用初始频率偏移估计的信道估计符号期间的频率偏移补偿以及在频域中执行的报头和数据部分期间的频率偏移更新跟踪。 初始频率偏移估计包括使用与多个时间滞后自相关结果相对应的和，其对应于分组的前导码部分的最后连续符号的数量，其中自相关是互相关窗口上的和的结果 在输入信号和相应的分组同步序列之间。 接收机包括用于初始频率偏移估计的接收器块，频率偏移补偿，频率偏移更新跟踪和获得当前频率偏移估计。

    Generalized puncturing in a communication system
    2.
    发明申请
    Generalized puncturing in a communication system 审中-公开
    通信系统中的广义穿孔

    公开(公告)号：US20050204266A1

    公开(公告)日：2005-09-15

    申请号：US11081327

    申请日：2005-03-15

    申请人： Ravishankar Mahadevappa ,  Stephan Brink

    发明人： Ravishankar Mahadevappa ,  Stephan Brink

    IPC分类号： H03M13/00 ,  H03M13/23 ,  H04B1/69 ,  H04B1/707 ,  H04B1/713

    CPC分类号： H03M13/23 ,  H03M13/6362 ,  H04L1/0068 ,  H04L27/2602

    摘要： A rate adaptation scheme for a wireless transmission system. An information message encoded at a mother rate code is punctured to achieve an adapted rate approximate a selected code rate. The adapted code rate is such that all of the bits transmitted by multi bit symbols, such as OFDM symbols, are used to transmit information of the information message. The use of zero pad bits, or pad bits which cannot provide information regarding entirety of the information message is thereby reduced.

    摘要翻译： 一种用于无线传输系统的速率适配方案。 以母率码编码的信息消息被打孔以实现接近所选码率的适配速率。 适应的码率使得通过诸如OFDM符号的多比特符号发送的所有比特被用于发送信息消息的信息。 从而减少使用不能提供有关信息消息整体的信息的零填充比特或填充比特。

    Reduced complexity soft output demapping
    3.
    发明申请
    Reduced complexity soft output demapping 审中-公开
    降低复杂性软输出解映射

    公开(公告)号：US20070058756A1

    公开(公告)日：2007-03-15

    申请号：US11490851

    申请日：2006-07-21

    申请人： Ravishankar Mahadevappa ,  Stephan Brink

    发明人： Ravishankar Mahadevappa ,  Stephan Brink

    IPC分类号： H04L27/06

    CPC分类号： H04L25/067 ,  H04B1/71637 ,  H04L25/0226 ,  H04L27/22 ,  H04L27/2647 ,  H04L27/38

    摘要： Method and system for extracting soft estimates of DCM or 16-QAM modulated symbols that are received from a noisy channel. Optimal soft demapping rules are approximated using equations that are division-free and eliminate the need for implementing exponential and logarithmic functions that are inconvenient for hardware implementation.

    摘要翻译： 用于提取从噪声通道接收的DCM或16-QAM调制符号的软估计的方法和系统。 使用无分割的方程近似最优软解映射规则，并且不需要实现硬件实现不方便的指数和对数函数。

    Tone sensing and nulling in frequency-hopped multicarrier system
    4.
    发明申请
    Tone sensing and nulling in frequency-hopped multicarrier system 审中-公开
    跳频多载波系统中的音调感知和归零

    公开(公告)号：US20070058693A1

    公开(公告)日：2007-03-15

    申请号：US11494072

    申请日：2006-07-27

    申请人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    发明人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    IPC分类号： H04B1/00 ,  H04K1/10

    CPC分类号： H04L27/2626 ,  H04B1/713 ,  H04B1/715 ,  H04L5/0007 ,  H04L5/0062 ,  H04L25/0224 ,  H04L27/2602 ,  H04L27/2647

    摘要： A method and system for removing frequencies interfering with a UWB OFDM receiver from transmission frequencies of the UWB communication. A sensing mechanism is added to the receiver that develops an energy histogram for the frequencies in a received signal and develops a tone mask for masking the interfering frequencies. The tone mask is applied after a mapping stage in the transmitter of the UWB communication and removes the interfering frequencies from the transmitted signal. Various criteria based on energy averaging are used to identify and null and remove the interfering frequencies.

    摘要翻译： 一种用于从UWB通信的传输频率去除干扰UWB OFDM接收机的频率的方法和系统。 将感测机制添加到接收机中，以形成接收信号中的频率的能量直方图，并且形成用于掩蔽干扰频率的色调掩码。 在UWB通信的发射机中的映射阶段之后应用音调掩模，并从发送的信号中去除干扰频率。 使用基于能量平均的各种标准来识别和消除和消除干扰频率。

    Frame synchronization
    8.
    发明申请
    Frame synchronization 有权
    帧同步

    公开(公告)号：US20070064744A1

    公开(公告)日：2007-03-22

    申请号：US11505624

    申请日：2006-08-16

    申请人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    发明人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    IPC分类号： H04J3/06

    CPC分类号： H04L27/2656 ,  H04L27/2675

    摘要： Frame synchronization methods and systems suited for packet communications systems, and particularly time frequency hopping packet communication systems, are disclosed. Frame synchronization is performed by performing a first correlation on information of received symbols and performing a second correlation on results of the first correlation. In systems with repeating synchronization information modulated by a cover sequence, the results of the second correlation may be used to determine symbol numbering of symbols in a packet.

    摘要翻译： 公开了适用于分组通信系统，特别是时间跳频分组通信系统的帧同步方法和系统。 通过对接收到的符号的信息执行第一相关并对第一相关的结果执行第二相关来执行帧同步。 在具有由覆盖序列调制的重复同步信息的系统中，第二相关的结果可用于确定分组中符号的符号编号。

    Packet detection
    9.
    发明申请
    Packet detection 有权
    数据包检测

    公开(公告)号：US20070055501A1

    公开(公告)日：2007-03-08

    申请号：US11506193

    申请日：2006-08-16

    申请人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    发明人： Turgut Aytur ,  Stephan Brink ,  Ravishankar Mahadevappa ,  Ran Yan

    IPC分类号： G10L19/00

    CPC分类号： H04L7/042 ,  H04B1/7183 ,  H04L27/2656 ,  H04L27/2675 ,  H04L27/2676 ,  H04W24/00

    摘要： An apparatus for and a method of performing packet detection in a receiver is provided. The apparatus is configured to determine a measure of a correlation between information of one or more received symbols and synchronization information. The apparatus is also configured to determine a measure of an energy value of one or more of the received symbols. The apparatus is also configured to determine if a packet has been detected based on the measure of the correlation and the measure of the energy value of the one or more received symbols.

    摘要翻译： 提供了一种用于在接收机中执行分组检​​测的装置和方法。 该装置被配置为确定一个或多个接收到的符号的信息与同步信息之间的相关性的度量。 该装置还被配置为确定一个或多个接收符号的能量值的度量。 该装置还被配置为基于相关性的测量和一个或多个接收符号的能量值的测量来确定是否已经检测到分组。