公开(公告)号：US20130287068A1

公开(公告)日：2013-10-31

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： H04L1/20

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。

公开(公告)号：US08270515B2

公开(公告)日：2012-09-18

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

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：US08179779B2

公开(公告)日：2012-05-15

申请号：US12586823

申请日：2009-09-29

申请人： Alexei Ashikhmin ,  Thomas Louis Marzetta

发明人： Alexei Ashikhmin ,  Thomas Louis Marzetta

IPC分类号： H04J11/00

CPC分类号： H04L25/0226 ,  H04L25/03343 ,  H04L2025/03426

摘要： A construction is provided for uplink pilot signals in a cellular network. Three sets of pilot signals are defined, having orthogonality properties that lead to reduced inter-cell interference. In example embodiments, the network has a reuse factor of 3 for pilot signals, with sets U, V, and W of pilot signals assigned to cells in respective reuse classes. The pilots of each set form an orthogonal basis. Some pilots of each class, i.e. those which will generally be assigned to mobile stations near the cell edges, will also form an orthogonal basis with some pilots of each of the other classes.

摘要翻译： 为蜂窝网络中的上行链路导频信号提供了一种结构。 定义了三组导频信号，具有导致小区间干扰减小的正交性质。 在示例实施例中，网络对于导频信号具有3的重用因子，其中分配给相应重用类别中的小区的导频信号的集合U，V和W。 每组的导频形成正交基。 每个类别的一些导频，即通常被分配给小区边缘附近的移动台的那些导频，也将与每个其他类的一些导频形成正交基。

公开(公告)号：US08107550B2

公开(公告)日：2012-01-31

申请号：US12232737

申请日：2008-09-23

申请人： Alexei Ashikhmin

发明人： Alexei Ashikhmin

IPC分类号： H04B7/02

CPC分类号： H04L25/03343 ,  H04L25/0204 ,  H04L25/0212 ,  H04L2025/03426

摘要： Methods discussed herein provide more efficient precoding matrices for precoding signals prior to transmission. The methods discussed herein improve throughput in wireless MIMO systems. Methods discussed herein are applicable to frequency division duplexing (FDD) systems, time division duplexing (TDD) systems as well as other wireless communication systems.

摘要翻译： 本文讨论的方法为传输前的预编码信号提供了更有效的预编码矩阵。 本文讨论的方法提高无线MIMO系统中的吞吐量。 本文讨论的方法适用于频分双工（FDD）系统，时分双工（TDD）系统以及其他无线通信系统。

公开(公告)号：US07809070B2

公开(公告)日：2010-10-05

申请号：US11753332

申请日：2007-05-24

申请人： Alexei Ashikhmin ,  Philip Alfred Whiting ,  Adriaan J. De Lind Van Wijngaarden

发明人： Alexei Ashikhmin ,  Philip Alfred Whiting ,  Adriaan J. De Lind Van Wijngaarden

IPC分类号： H04L27/28

CPC分类号： H04B3/487 ,  H04L27/2601

摘要： Techniques are disclosed for measuring crosstalk between at least two communication channels of a communication system. A receiver of the system receives a signal over a given one of the communication channels from a transmitter of the system. The receiver correlates the received signal with a sequence of time-domain signals associated with another of the communication channels, and generates a measure of crosstalk between the given communication channel and the other communication channel based on the correlation between the received signal and the sequence of time-domain signals. The sequence of time-domain signals may be selected from a designated set of M-sequences.

摘要翻译： 公开了用于测量通信系统的至少两个通信信道之间的串扰的技术。 系统的接收机从系统的发射器接收通过给定的一个通信信道的信号。 接收器将接收到的信号与与另一个通信信道相关联的时域信号序列进行相关，并且基于接收信号和序列之间的相关性，生成给定通信信道与另一通信信道之间的串扰量度 时域信号。 可以从指定的一组M序列中选择时域信号的序列。

公开(公告)号：US20090245081A1

公开(公告)日：2009-10-01

申请号：US12060653

申请日：2008-04-01

申请人： Alexei Ashikhmin ,  Adriaan J. De Lind Van Wijngaarden ,  Gerhard Guenter Kramer ,  Carl Jeremy Nuzman ,  Philip Alfred Whiting

发明人： Alexei Ashikhmin ,  Adriaan J. De Lind Van Wijngaarden ,  Gerhard Guenter Kramer ,  Carl Jeremy Nuzman ,  Philip Alfred Whiting

IPC分类号： H04J3/10

CPC分类号： H04M3/18 ,  H04M3/30 ,  H04M3/34 ,  H04M2203/058

摘要： At least one channel is joined to a group of active channels in a communication system by transmitting control signals to configure respective customer premises equipment (CPE) of the active channels into a joining mode of operation, and transmitting a joining signature sequence to CPE of the joining channel over a downstream data signal path of the joining channel. A central office (CO) or other access node of the system receives correlation results from respective active channel CPE, estimates crosstalk from the joining channel into the active channels based on the correlation results, configures a precoder based on the estimated crosstalk, and adds the joining channel to the group of active channels. The channels may comprise respective subscriber lines of a DSL communication system.

摘要翻译： 通过发送控制信号将至少一个信道连接到通信系统中的一组活动信道，以将活动信道的相应客户驻地设备（CPE）配置为加入操作模式，并将加入签名序列发送到 在加入信道的下游数据信号路径上加入信道。 该系统的中心局（CO）或其他接入节点从相应的有源信道CPE接收相关结果，基于相关结果估计从加入信道到有源信道的串扰，基于所估计的串扰配置预编码器， 加入频道到活跃频道组。 信道可以包括DSL通信系统的相应用户线路。

公开(公告)号：US20090116582A1

公开(公告)日：2009-05-07

申请号：US11934347

申请日：2007-11-02

申请人： Alexei Ashikhmin ,  Adriaan J. De Lind Van Wijngaarden ,  Gerhard Guenter Theodor Kramer ,  Philip Alfred Whiting ,  Miroslav Zivkovic

发明人： Alexei Ashikhmin ,  Adriaan J. De Lind Van Wijngaarden ,  Gerhard Guenter Theodor Kramer ,  Philip Alfred Whiting ,  Miroslav Zivkovic

IPC分类号： H04L25/49

CPC分类号： H04B3/32 ,  H04B3/487

摘要： Techniques are disclosed that efficiently obtain channel crosstalk estimates in DSL systems and other communication systems that may include unsynchronized channels. For example, a method includes obtaining a first set of estimated measures of crosstalk for a first portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to a plurality of receivers, and interpolating a second set of estimated measures of crosstalk for a second portion of the plurality of communication channels based on the first set of estimated measures of crosstalk. The first portion of the plurality of communication channels may be a subset of the plurality of communication channels and the second portion of the plurality of communication channels is a remainder of the plurality of communication channels. Each estimated measure of crosstalk may relate to at least one tone associated with at least one of the plurality of communication channels.

摘要翻译： 公开了在DSL系统和可能包括不同步信道的其他通信系统中有效地获得信道串扰估计的技术。 例如，一种方法包括获得第一组估计的多个通信信道的第一部分的串扰测量值，数据信号将从该发送器发送到多个接收机，并且内插第二组估计度量 基于所述第一组估计的串扰测量值，所述多个通信信道的第二部分的串扰。 多个通信信道的第一部分可以是多个通信信道的子集，并且多个通信信道的第二部分是多个通信信道的剩余部分。 每个估计的串扰测量可以涉及与多个通信信道中的至少一个相关联的至少一个音调。

公开(公告)号：US20080316975A1

公开(公告)日：2008-12-25

申请号：US11766927

申请日：2007-06-22

申请人： Alexei Ashikhmin

发明人： Alexei Ashikhmin

IPC分类号： H04B7/216

CPC分类号： H04B7/0417 ,  H04B7/0452 ,  H04B7/0639 ,  H04B7/0663

摘要： Improved techniques are disclosed for quantizing complex vectors in communication systems. For example, a method includes the following steps. At least one complex vector representative of at least one element of a communication system is obtained. A codeword that approximates the complex vector is identified. The identified codeword is a codeword, from a set of codewords, wherein a real part of a product of the codeword and a scaled version of the complex vector is about maximal over the set of codewords. The scaled version of the complex vector is the product of the complex vector and a constant from a set of constants. In one embodiment, the element of the communication system that the complex vector represents is a channel between a base station and a user terminal in the communication system.

摘要翻译： 公开了改进的技术来量化通信系统中的复杂向量。 例如，一种方法包括以下步骤。 获得代表通信系统的至少一个元件的至少一个复数向量。 识别近似复数向量的码字。 识别的码字是来自一组码字的码字，其中码字的乘积的实部和复矢量的缩放版本在码字集合上大约是最大的。 复数向量的缩放版本是复数向量的乘积和来自一组常量的常数。 在一个实施例中，复向量表示的通信系统的元素是通信系统中的基站和用户终端之间的信道。

公开(公告)号：US07251769B2

公开(公告)日：2007-07-31

申请号：US10802515

申请日：2004-03-17

申请人： Alexei Ashikhmin ,  Gerhard Guenter Theodor Kramer ,  Stephan Ten Brink

发明人： Alexei Ashikhmin ,  Gerhard Guenter Theodor Kramer ,  Stephan Ten Brink

IPC分类号： H03M13/29 ,  H03M13/45

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：US20050243895A1

公开(公告)日：2005-11-03

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： H04J11/00 ,  H04B1/707

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. The 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。 选择码本中每个矢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。