公开(公告)号：US06631124B1

公开(公告)日：2003-10-07

申请号：US09432989

申请日：1999-11-03

申请人： Havish Koorapaty ,  Yi-Pin Eric Wang ,  Paul W. Dent

发明人： Havish Koorapaty ,  Yi-Pin Eric Wang ,  Paul W. Dent

IPC分类号： H04J300

CPC分类号： H04W72/08 ,  H04B7/2618 ,  H04W48/06

摘要： A wireless communications system including at least one base station operative to communicate with terminals on a plurality of carrier frequencies in repetitive time slots defined thereon is operated by assigning an entire time slot or a spreading-code defined subchannel of a time slot to a terminal based on a communications constraint associated with the terminal. The communications constraint may include a performance requirement, such as an information rate or an error rate, and a signal reception condition, such as signal to noise ratio. According to another aspect, a wireless communications system determines a communications constraint associated with a terminal. The system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal based on the determined communications constraint. Preferably, the system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal such that at least one of an available bandwidth, a number of available time slots, and a number of available spreading codes is optimized. Related apparatus are also described.

摘要翻译： 一种无线通信系统，包括至少一个基站，可操作以与在其上定义的重复时隙中的多个载波频率上的终端进行通信，通过将时隙的全部时隙或扩展码定义的子信道分配给终端来进行操作 关于与终端相关联的通信约束。 通信约束可以包括诸如信息速率或错误率的性能要求，以及诸如信噪比的信号接收条件。 根据另一方面，无线通信系统确定与终端相关联的通信约束。 系统基于所确定的通信约束向终端分配时隙，扩展码，编码率和带宽。 优选地，系统向终端分配时隙，扩展码，编码率和带宽，使得可用带宽，可用时隙的数量和可用扩展码的数量中的至少一个被优化。 还描述了相关装置。

公开(公告)号：US20120155274A1

公开(公告)日：2012-06-21

申请号：US12972688

申请日：2010-12-20

申请人： Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

发明人： Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

IPC分类号： H04W28/08

CPC分类号： H04L63/1458 ,  H04W12/12

摘要： A system and method to substantially prevent Denial of Service (DoS) attacks due to Random Access Channel (RACH) overload in cellular wireless networks. Once a mobile handset is identified to cause or contribute significantly to a RACH overload of the cell, the system sends a special System Information Block (SIB) message targeted to that mobile handset and instructing it to redirect its RACH signaling to a separate RACH/PRACH (Physical Random Access Channel) resource or to a small part of the current RACH/PRACH resource. This allows most or all of the regular RACH/PRACH resource from being overloaded by a single user or a group of users. The use of a separate RACH/PRACH resource such as frequency, preamble sequence, and/or radio subframe access slot to “absorb” high volume RACH signaling traffic from a small number of malicious/defective mobile handsets substantially prevents the signaling DoS attacks in the wireless network and makes it more robust to such attacks.

摘要翻译： 一种基本上防止由于蜂窝无线网络中的随机接入信道（RACH）过载引起的拒绝服务（DoS）攻击的系统和方法。 一旦移动手机被识别为小区的RACH重载导致或显着贡献，则系统发送针对该移动手机的专用系统信息块（SIB）消息，并指示其将其RACH信令重定向到单独的RACH / PRACH （物理随机访问信道）资源或当前RACH / PRACH资源的一小部分。 这允许大多数或全部常规RACH / PRACH资源被单个用户或一组用户过载。 使用诸如频率，前导码序列和/或无线电子帧接入时隙的单独的RACH / PRACH资源来从少量的恶意/有缺陷的移动手机“吸收”大容量的RACH信令业务基本上防止了信令DoS攻击 无线网络，并使其对这种攻击更加强大。

公开(公告)号：US08711791B2

公开(公告)日：2014-04-29

申请号：US12972688

申请日：2010-12-20

申请人： Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

发明人： Yi-Pin Eric Wang ,  Dennis Hui ,  Havish Koorapaty

IPC分类号： H04W4/00

CPC分类号： H04L63/1458 ,  H04W12/12

摘要： A method of managing wireless transmissions from a mobile handset includes determining whether the mobile handset is a source of a Random Access Channel (RACH) overload in the wireless network and, upon determining that the mobile handset is a source of the RACH overload, configuring the mobile handset to replace usage of a first RACH resource causing the RACH overload with usage of a second RACH resource specified by the processor.

摘要翻译： 管理来自移动手持机的无线传输的方法包括确定移动手持机是否是无线网络中随机接入信道（RACH）过载的源，并且在确定移动手持机是RACH过载的源时，配置 移动手机来替换使用由处理器指定的第二RACH资源的导致RACH过载的第一RACH资源的使用。

公开(公告)号：US5838267A

公开(公告)日：1998-11-17

申请号：US728158

申请日：1996-10-09

申请人： Yi-Pin Eric Wang ,  Sandeep Chennakeshu ,  Paul W. Dent ,  Kumar Balachandran

发明人： Yi-Pin Eric Wang ,  Sandeep Chennakeshu ,  Paul W. Dent ,  Kumar Balachandran

IPC分类号： H03M13/37 ,  G06F11/10 ,  H03M13/00 ,  H03M13/29 ,  H04L1/00 ,  H04L1/06 ,  H04L1/18 ,  G06F11/00

CPC分类号： H04L1/0057 ,  H03M13/00 ,  H03M13/2927 ,  H03M13/293 ,  H03M13/2942 ,  H03M13/3769 ,  H04L1/06 ,  H03M13/1505 ,  H03M13/6306 ,  H04L1/0071

摘要： A method for encoding and decoding the digital information sequence uses a combination of two block codes to simultaneously correct and detect errors. The information sequence is encoded by a first stage of the encoder to produce an information code word including an information vector and a primary redundancy vector. The primary redundancy vector is encoded in a second stage of the encoder to obtain a redundancy code word. The information code word and redundancy code word are interleaved and transmitted to the receiver. At the receiver, the information code word and redundancy code word are decoded in a first stage of the decoder to obtain a first estimate of the information code word. The first estimate of the information code word is decoded in the second stage of the decoder to produce a second estimate of the information code word. The distance between the first and second estimates of the information code word is evaluated. If the distance is more than one, the received code word is erased. In another embodiment, the information sequence is repeated at the receiver. Each repetition includes a parity check resulting from the same code or from different codes. The received information vectors are selectively combined and then individually decoded using the individual parity vectors to generate multiple estimates of the information sequence. The estimates are then combined using hard or soft combining techniques.

摘要翻译： 用于对数字信息序列进行编码和解码的方法使用两个块码的组合来同时校正和检测错误。 信息序列由编码器的第一级编码，以产生包括信息向量和主冗余向量的信息码字。 主冗余矢量被编码在编码器的第二级以获得冗余码字。 信息码字和冗余码字被交织并发送到接收机。 在接收机处，信息码字和冗余码字在解码器的第一级解码，以获得信息码字的第一估计。 在解码器的第二级解码信息码字的第一估计，以产生信息码字的第二估计。 评估信息码字的第一和第二估计之间的距离。 如果距离大于1，则接收到的代码字被擦除。 在另一个实施例中，在接收器处重复信息序列。 每个重复都包括由相同代码或不同代码产生的奇偶校验。 选择性地组合所接收的信息向量，然后使用各个奇偶校验向量单独解码以生成信息序列的多个估计。 然后使用硬或软组合技术组合估计值。

公开(公告)号：US07440489B2

公开(公告)日：2008-10-21

申请号：US09923374

申请日：2001-08-07

申请人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

发明人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

IPC分类号： H04K1/00 ,  H04B15/00 ,  H04L27/30

CPC分类号： H04B1/7115 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/712 ,  H04B2201/7071 ,  H04B2201/709727

摘要： A spread spectrum signal is processed by correlating the spread spectrum signal with a spreading sequence at a first plurality of correlation times to produce a first plurality of time-offset correlations. The first plurality of time-offset correlations is processed to produce a first symbol representation for a symbol. A first quality is determined for the first symbol representation. Responsive to the determined first quality, it is determined whether to further process the first symbol representation or to process a second symbol representation for the symbol generated from the spread spectrum signal. The first quality may be determined, for example, by decoding the first symbol representations to generate a decoding metric or error check indicator, such as a CRC result. The symbol representations may be generated and/or evaluated for quality in a serial fashion or a parallel fashion.

摘要翻译： 通过在第一多个相关时间将扩展频谱信号与扩频序列相关来处理扩展频谱信号，以产生第一多个时间偏移相关。 处理第一多个时间偏移相关以产生符号的第一符号表示。 确定第一个符号表示的第一个质量。 响应于确定的第一质量，确定是否进一步处理第一符号表示或处理从扩频信号产生的符号的第二符号表示。 可以例如通过对第一符号表示进行解码以产生诸如CRC结果的解码度量或错误检查指示符来确定第一质量。 符号表示可以以串行方式或并行方式生成和/或评估质量。

公开(公告)号：US09253783B2

公开(公告)日：2016-02-02

申请号：US13403683

申请日：2012-02-23

申请人： Yi-Pin Eric Wang ,  Anders Wallén ,  Stephen Grant

发明人： Yi-Pin Eric Wang ,  Anders Wallén ,  Stephen Grant

IPC分类号： H04W72/04

CPC分类号： H04W72/0486 ,  H04W72/0453

摘要： The method an apparatus described herein manages uplink resources to increase spectral efficiency and system capacity. According to one embodiment of the present invention, a base station may be assigned two or more downlink carriers for downlink transmission and two or more corresponding uplink carriers. In a multi-carrier mode, the base station may transmit signals on two or more downlink carriers to the same mobile terminal, and receive signals from the mobile terminal on one of the paired uplink terminals. The uplink carriers can be operated at different interference levels and the uplink traffic can be divided between the available uplink carriers based on the type of traffic and/or data transmission parameters. The mobile terminals may also be allowed to switch between the uplink carriers to improve overall efficiency.

摘要翻译： 本文描述的装置的方法管理上行链路资源以提高频谱效率和系统容量。 根据本发明的一个实施例，可以为基站分配用于下行链路传输的两个或更多个下行链路载波和两个或更多个对应的上行链路载波。 在多载波模式中，基站可以在两个或多个下行链路载波上发送信号到同一个移动终端，并且在一个上行链路终端中的一个上接收来自移动终端的信号。 上行链路载波可以以不同的干扰级别操作，并且可以基于业务类型和/或数据传输参数在可用的上行链路载波之间划分上行链路业务。 还可以允许移动终端在上行链路载波之间切换以提高整体效率。

公开(公告)号：US08761323B2

公开(公告)日：2014-06-24

申请号：US13333478

申请日：2011-12-21

申请人： Yi-Pin Eric Wang ,  Gregory Bottomley ,  Jung-Fu Cheng ,  Stephen Grant ,  Ning He ,  Niklas Johansson ,  Cagatay Konuskan

发明人： Yi-Pin Eric Wang ,  Gregory Bottomley ,  Jung-Fu Cheng ,  Stephen Grant ,  Ning He ,  Niklas Johansson ,  Cagatay Konuskan

IPC分类号： H04B1/10

CPC分类号： H04W72/1278 ,  H04B1/71075 ,  H04B1/712 ,  H04W72/082

摘要： In a receive node of a wireless network, an iterative multi-user multi-stage interference cancellation receiver is used. After each stage of interference cancellation, interference characteristics change. An adaptive strategy is used in which after each stage of interference cancellation, impairment covariance is parametrically updated and combining weights of the receiver are adapted to reflect the updated impairment covariance.

摘要翻译： 在无线网络的接收节点中，使用迭代多用户多级干扰消除接收机。 在干扰消除的每个阶段之后，干扰特性发生变化。 使用自适应策略，其中在干扰消除的每个阶段之后，对损伤协方差进行参数更新，并且接收机的组合权重被适配以反映更新的损害协方差。

公开(公告)号：US08743987B2

公开(公告)日：2014-06-03

申请号：US13050210

申请日：2011-03-17

申请人： Yi-Pin Eric Wang

发明人： Yi-Pin Eric Wang

IPC分类号： H04L27/06 ,  H04L27/01 ,  H04B1/10

CPC分类号： H04L25/08 ,  H04L25/03012 ,  H04L25/03159 ,  H04L25/03171 ,  H04L25/03184 ,  H04L25/03312 ,  H04L25/03331 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A receiver is configured to perform symbol detection based on a total frequency domain received signal that comprises contribution from a block of time domain symbols. The receiver comprises electronic circuitry operate to divide the block into plural sub-blocks, and for each sub-block, to jointly detect the symbols of the sub-block while treating symbols of the block which are outside of the sub-block as noise.

摘要翻译： 接收机被配置为基于包括来自时域符号块的贡献的总频域接收信号执行符号检测。 接收机包括电子电路，用于将块划分为多个子块，并且对于每个子块，共同检测子块的符号，同时将处于子块外部的块的符号作为噪声进行处理。

公开(公告)号：US08724741B2

公开(公告)日：2014-05-13

申请号：US12572680

申请日：2009-10-02

申请人： Gregory E. Bottomley ,  Yi-Pin Eric Wang

发明人： Gregory E. Bottomley ,  Yi-Pin Eric Wang

IPC分类号： H04L27/00 ,  H04L27/06 ,  H03D1/06

CPC分类号： H04B17/309 ,  H04B17/26 ,  H04L2025/03426

摘要： The quality of a received signal in a non-linear receiver is estimated using a coupling matrix G or Q that describes the interaction of symbols in the received signal with other symbols and/or how the impairment (noise and interference) interacts in the received signal. The coupling matrix is also useful for joint detection. The signal quality estimate may include, e.g., the minimum eigenvalue, and other functions, such as the determinant and trace of the coupling matrix. When G or Q varies with each block, as in CDMA systems employing longcode scrambling, a representative matrix can be used, such as a matrix of RMS values or average magnitudes of real and imaginary components. The signal quality estimate can be expressed as a bit error rate (BER).

摘要翻译： 使用描述接收信号中的符号与其他符号的相互作用和/或接收信号中的损害（噪声和干扰）如何相互作用的耦合矩阵G或Q来估计非线性接收机中的接收信号的质量 。 耦合矩阵对于联合检测也是有用的。 信号质量估计可以包括例如最小特征值和其他函数，诸如耦合矩阵的行列式和轨迹。 当G或Q随每个块变化时，如在使用长码扰码的CDMA系统中，可以使用代表性矩阵，例如RMS值矩阵或实部和虚部分量的平均幅度。 信号质量估计可以表示为误码率（BER）。

公开(公告)号：US08718199B2

公开(公告)日：2014-05-06

申请号：US13050433

申请日：2011-03-17

申请人： Yi-Pin Eric Wang ,  Gregory E. Bottomley

发明人： Yi-Pin Eric Wang ,  Gregory E. Bottomley

IPC分类号： H04L27/06

CPC分类号： H04L25/08 ,  H04L25/03012 ,  H04L25/03159 ,  H04L25/03171 ,  H04L25/03184 ,  H04L25/03312 ,  H04L25/03331 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A receiver comprises plural receive antennas and electronic circuitry. The plural receive antennas are configured to receive, on plural subcarriers transmitted over a radio interface, a frequency domain signal that comprises contribution from a block of time domain symbols. The electronic circuitry is configured or operable to perform symbol detection of time domain symbols comprising the block by performing a multi-stage joint detection procedure comprising plural stages, and thus serves as a detector (40). For a first stage the block is divided into a first number of sub-blocks each having a sub-block first size. For a second stage the block is divided into a second number of sub-blocks each having a sub-block second size, the sub-block second size being greater than the sub-block first size. For each stage a detector (40) formulates frequency domain combining weights and uses the frequency domain combining weights for combining multiple receive versions of each subcarrier to provide candidate symbol combination values for symbols in each sub-block of the respective stage. For the second stage the detector (40) is further configured to use the candidate symbol combination values of the first stage to formulate joint hypotheses to serve as candidates for the joint detection operation of the second stage.

摘要翻译： 接收机包括多个接收天线和电子电路。 多个接收天线被配置为在由无线电接口发送的多个子载波上接收包括来自时域符号块的贡献的频域信号。 电子电路被配置或可操作以通过执行包括多个级的多级联合检测过程来执行包括该块的时域符号的符号检测，从而用作检测器（40）。 对于第一阶段，块被分成具有子块第一大小的第一数量的子块。 对于第二级，块被分成第二数量的子块，每个子块具有子块的第二尺寸，子块的第二尺寸大于子块的第一尺寸。 对于每个阶段，检测器（40）制定频域组合权重并使用频域组合权重来组合每个子载波的多个接收版本，以为相应级的每个子块中的符号提供候选符号组合值。 对于第二级，检测器（40）还被配置为使用第一级的候选符号组合值来形成联合假设以用作第二级的联合检测操作的候选。