公开(公告)号：US20050210367A1

公开(公告)日：2005-09-22

申请号：US10802515

申请日：2004-03-17

申请人： Alexei Ashikhmin ,  Gerhard Kramer ,  Stephan Brink

发明人： Alexei Ashikhmin ,  Gerhard Kramer ,  Stephan Brink

IPC分类号： G06F11/00 ,  H03M13/00 ,  H03M13/11

CPC分类号： H03M13/1174 ,  H03M13/1105

摘要： Techniques and systems for design and use of generalized LDPC codes. A generalized LDPC code comprises a set of codewords producing valid results when submitted to a validator comprising a set of variable nodes and a set of check nodes, with outputs of the variable nodes being connected to inputs of the check nodes by interleaver edges. Each check node and variable node is in the form of a code, with the output of a node being valid if its inputs form a valid codeword. An extrinsic information transfer function (EXIT) chart is used to form a check node curve and a variable node curve is matched to the check node curve. The variable nodes are then constructed so as to provide the information transfer properties indicated by the variable node curve.

摘要翻译： 用于设计和使用广义LDPC码的技术和系统。 广义LDPC码包括当提交给包括一组可变节点和一组校验节点的校验器的验证器时产生有效结果的一组码字，其中变量节点的输出通过交织器边缘连接到校验节点的输入。 每个校验节点和变量节点都是一个代码的形式，一个节点的输出如果它的输入形成一个有效的代码字，它是有效的。 外部信息传递函数（EXIT）图用于形成校验节点曲线，变量节点曲线与校验节点曲线相匹配。 然后构造变量节点以提供由变量节点曲线指示的信息传递属性。

公开(公告)号：US09094144B2

公开(公告)日：2015-07-28

申请号：US10835085

申请日：2004-04-29

申请人： Alexei Ashikhmin ,  Jung-Tao Liu

发明人： Alexei Ashikhmin ,  Jung-Tao Liu

IPC分类号： H04B1/7097 ,  H04J13/00 ,  H04J13/10

CPC分类号： H04J13/00 ,  H04B2201/70706 ,  H04J13/10

摘要： A method and apparatus are provided for generating a code book for use in a CDMA system. The code book comprises of a plurality of vectors that are used to encode user data. An amplitude and polarity for each vector in the code book are selected to provide a reduced peak-to-average power ratio. The amplitude values can be selected to provide a reduced peak-to-average power ratio while maintaining a desired average energy per chip. The desired energy per chip can be based on the energy per chip of a CDMA system having a lower order spreading factor. Performance can be further improved by employing a first code book under a first signal-to-noise ratio condition and a second code book under a second signal-to-noise ratio condition.

摘要翻译： 提供了一种生成用于CDMA系统的码本的方法和装置。 码本由用于编码用户数据的多个向量组成。 选择代码簿中每个向量的幅度和极性以提供降低的峰均功率比。 可以选择振幅值以提供降低的峰均功率比，同时保持每芯片所需的平均能量。 每个芯片的期望能量可以基于具有较低阶扩频因子的CDMA系统的每芯片的能量。 通过在第一信噪比条件下采用第一码本和第二信噪比条件下的第二码本可以进一步提高性能。

公开(公告)号：US08774146B2

公开(公告)日：2014-07-08

申请号：US13329834

申请日：2011-12-19

申请人： Alexei Ashikhmin ,  Thomas L. Marzetta

发明人： Alexei Ashikhmin ,  Thomas L. Marzetta

IPC分类号： H04W92/00 ,  H04W52/24 ,  H04L5/00 ,  H04L27/26

CPC分类号： H04W52/243 ,  H04L5/005 ,  H04L25/03343 ,  H04L27/2675 ,  H04L2025/03426 ,  H04W52/24

摘要： Methods are provided for mitigating interference due to pilot contamination in a cellular network in which there is reuse of pilot signals. In embodiments, forward-link signals are precoded, using knowledge of slow-fading coefficients, to mitigate the interference. In embodiments, interference in reverse-link signals destined for a given base station is mitigated by linearly combining reverse-link signals destined for the given base station and for other base stations of the network, using knowledge of slow-fading coefficients.

摘要翻译： 提供了用于减轻由于导频信号重用的蜂窝网络中的导频污染引起的干扰的方法。 在实施例中，使用慢衰落系数的知识来预编码前向链路信号以减轻干扰。 在实施例中，使用慢衰落系数的知识，通过线性组合去往给定基站的反向链路信号和网络的其他基站来减轻去往给定基站的反向链路信号的干扰。

公开(公告)号：US08594215B2

公开(公告)日：2013-11-26

申请号：US13155733

申请日：2011-06-08

申请人： Thomas L. Marzetta ,  Alexei Ashikhmin

发明人： Thomas L. Marzetta ,  Alexei Ashikhmin

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/03343 ,  H04B7/0452 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L2025/03426

摘要： Embodiments provide a MIMO system having a plurality of service antennas and method for data transmission and reception. The system includes a plurality of service antennas, where each service antenna is configured to simultaneously serve a plurality of terminals and independently receive a pilot sequence from the plurality of terminals. The system further includes a plurality of channel estimation units configured to independently generate an antenna-specific channel estimate based on the received pilot sequence and a plurality of pre-coding units configured to independently generate a coded signal to be transmitted to the plurality of terminals via a respective service antenna based on a set of data symbols and the antenna-specific channel estimate.

摘要翻译： 实施例提供具有多个服务天线的MIMO系统和用于数据发送和接收的方法。 该系统包括多个服务天线，其中每个服务天线被配置为同时服务多个终端并且独立地从多个终端接收导频序列。 该系统还包括：多个信道估计单元，被配置为基于接收到的导频序列独立地生成天线专用信道估计;以及多个预编码单元，被配置为独立地生成待发送到多个终端的编码信号，经由 基于一组数据符号和天线特定信道估计的相应服务天线。

公开(公告)号：US20120203810A1

公开(公告)日：2012-08-09

申请号：US13021481

申请日：2011-02-04

申请人： Alexei Ashikhmin

发明人： Alexei Ashikhmin

IPC分类号： G06F17/16

CPC分类号： H04L25/0242 ,  H04L25/03343

摘要： Various methods and devices are provided to address the need for reduced compression complexity in the area of compressive sensing. In one method, a vector x is compressed to obtain a vector y according to y=ΦRDx, where ΦRD=UΦRM·ΦRM is a compressive sensing matrix constructed using a second-order Reed-Muller code or a subcode of a second-order Reed-Muller code and U is a unitary matrix from the real or complex Clifford group G. In another method, vector y is decompressed to obtain vector x also according to y=ΦRDx. In some embodiments, decompression may involve computing y′=U−1y and then determining the vector x using the computed y′.

摘要翻译： 提供了各种方法和装置以满足在压缩感测领域降低压缩复杂性的需要。 在一种方法中，向量x被压缩以获得根据y =ΦRDx的向量y，其中ΦRD=UΦRM·ΦRM是使用二阶里德 - 穆勒码或二阶里德的子码构造的压缩感知矩阵 -Muller代码和U是来自实数或复数Clifford组G的酉矩阵。在另一种方法中，向量y被解压缩以获得也可以根据y =ΦRDx的向量x。 在一些实施例中，解压缩可以包括计算y'= U-1y，然后使用计算出的y'来确定向量x。

公开(公告)号：US08054925B2

公开(公告)日：2011-11-08

申请号：US12141305

申请日：2008-06-18

申请人： Alexei Ashikhmin ,  Adriaan J. de Lind van Wijngaarden ,  Thomas L. Marzetta

发明人： Alexei Ashikhmin ,  Adriaan J. de Lind van Wijngaarden ,  Thomas L. Marzetta

IPC分类号： H04L7/00 ,  H03L7/00

CPC分类号： H04L27/2662 ,  H04L27/2607 ,  H04L27/2666 ,  H04L27/2678

摘要： Various embodiments generally relate to a method for synchronizing a receiver, said method including receiving a stream that includes a cyclic extension, estimating a size of the cyclic extension, extracting an amount of the stream according to the estimated size, and comparing the extracted amount to the stream to determine thereby a portion of the stream likely to include a symbol start point.

摘要翻译： 各种实施例通常涉及用于同步接收机的方法，所述方法包括接收包括循环扩展的流，估计循环扩展的大小，根据估计大小提取流量，并将提取的量与 该流由此确定流的一部分可能包括符号起始点。

公开(公告)号：US20110182279A1

公开(公告)日：2011-07-28

申请号：US12695864

申请日：2010-01-28

申请人： Alexei Ashikhmin ,  Thomas L. Marzetta

发明人： Alexei Ashikhmin ,  Thomas L. Marzetta

IPC分类号： H04J3/06

CPC分类号： H04L25/0226 ,  H04B2201/70701 ,  H04J11/005 ,  H04L25/0204 ,  H04L25/03343 ,  H04L2025/03808

摘要： Embodiments are described to mitigate network interference issues and to enable a significant increase in the throughput of wireless systems. In one method, pilot transmissions of a first and second group of wireless units are synchronized. Each wireless unit of the first group and each wireless unit of the second group use a different orthogonal pilot (than others in their group) from the same group of orthogonal pilots. Also, the pilot transmissions of the second group of wireless units are synchronized so as to be shifted in time from the pilot transmissions of the first group. In another method, data from neighboring cells and pilots from wireless units are received at a cell. Channel vectors for the wireless units are then estimated using the received data from neighboring cells, the received pilots from the wireless units and previously estimated channel vectors between the cell and the neighboring cells.

摘要翻译： 描述了实施例以减轻网络干扰问题并且能够显着提高无线系统的吞吐量。 在一种方法中，第一和第二组无线单元的导频传输被同步。 第一组的每个无线单元和第二组的每个无线单元使用来自同一组正交导频的不同的正交导频（在其组中比其他组）。 此外，第二组无线单元的导频传输被同步，以便在第一组的导频传输中从时间上移位。 在另一种方法中，来自相邻小区的数据和来自无线单元的导频在小区被接收。 然后使用来自相邻小区的接收数据，来自无线单元的接收到的导频以及小区和相邻小区之间的先前估计的信道向量来估计用于无线单元的信道向量。

公开(公告)号：US20090067530A1

公开(公告)日：2009-03-12

申请号：US11899494

申请日：2007-09-06

申请人： Alexei Ashikhmin

发明人： Alexei Ashikhmin

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04B7/0417 ,  H04B7/0626 ,  H04B7/0639 ,  H04B7/0663

摘要： There is provided a system and method of operating a multiple-input multiple-output (MIMO) receiver with N antennas in a wireless communication system. The method includes measuring N vectors, each vector defining channel transfer coefficients between M antennas of a transmitter and a corresponding antenna of the receiver. Additionally, a vector in a linear space generated by the N measured vectors is selected and quantized values of less than M components of the selected vector are fed back to the transmitter.

摘要翻译： 提供了一种在无线通信系统中操作具有N个天线的多输入多输出（MIMO）接收机的系统和方法。 该方法包括测量N个向量，每个向量定义发射机的M个天线和接收机的相应天线之间的信道传输系数。 另外，选择由N个测量向量生成的线性空间中的向量，并且将所选向量的小于M个分量的量化值反馈给发射机。

公开(公告)号：US20090034668A1

公开(公告)日：2009-02-05

申请号：US12141305

申请日：2008-06-18

申请人： Alexei Ashikhmin ,  Adriaan J. de Lind van Wijngaarden ,  Thomas L. Marzetta

发明人： Alexei Ashikhmin ,  Adriaan J. de Lind van Wijngaarden ,  Thomas L. Marzetta

IPC分类号： H04L7/00 ,  H04L27/28

CPC分类号： H04L27/2662 ,  H04L27/2607 ,  H04L27/2666 ,  H04L27/2678

摘要： Various embodiments generally relate to a method for synchronizing a receiver, said method including receiving a stream that includes a cyclic extension, estimating a size of the cyclic extension, extracting an amount of the stream according to the estimated size, and comparing the extracted amount to the stream to determine thereby a portion of the stream likely to include a symbol start point.

摘要翻译： 各种实施例通常涉及用于同步接收机的方法，所述方法包括接收包括循环扩展的流，估计循环扩展的大小，根据估计大小提取流量，并将提取的量与 该流由此确定流的一部分可能包括符号起始点。

公开(公告)号：US08879647B2

公开(公告)日：2014-11-04

申请号：US13456749

申请日：2012-04-26

申请人： Alexei Ashikhmin ,  Philip A. Whiting

发明人： Alexei Ashikhmin ,  Philip A. Whiting

IPC分类号： H04L27/28

CPC分类号： H04L1/0009 ,  H04L5/0046

摘要： At least one example embodiment discloses a method of controlling a system. The method includes determining a constant number of bits for each of a plurality of tones, each constant number of bits being constant, obtaining a single parameter from a user of the system, the single parameter being a code rate and transmitting, to the user, data as information bits in the plurality of tones across a channel based on the single parameter, each of the plurality of tones including the constant number of bits.

摘要翻译： 至少一个示例性实施例公开了一种控制系统的方法。 该方法包括确定多个音调中的每一个的常数比特数，每个常数比特是恒定的，从系统的用户获得单个参数，该单个参数是码率并向用户发送， 数据作为基于单个参数的信道中的多个音调中的信息比特，多个音调中的每一个包括常数比特数。