公开(公告)号：US20110305291A1

公开(公告)日：2011-12-15

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： H04B7/02

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：US09893773B2

公开(公告)日：2018-02-13

申请号：US13238329

申请日：2011-09-21

申请人： Thomas L. Marzetta ,  Alexei Ashikhmin ,  Paul A. Polakos

发明人： Thomas L. Marzetta ,  Alexei Ashikhmin ,  Paul A. Polakos

IPC分类号： H04B7/024

CPC分类号： H04B7/024

摘要： A communication method uses a distributed cell-free network of spatially independent service antennas. According to the method, pilot sequences are allocated to a user population of access terminals by an allocation procedure that imposes local relative orthogonality of pilot sequences. Channel coefficients for access terminals are determined by measuring allocated pilot sequences as received by each of the service antennas. In embodiments of the invention, the determination of channel coefficients is performed independently and the resulting channel coefficients are locally stored at the respective service antennas. At each service antenna, a processor independently uses locally stored channel coefficients to precode forward link signals or to at least partially decode reverse link signals.

公开(公告)号：US20160227577A1

公开(公告)日：2016-08-04

申请号：US14610337

申请日：2015-01-30

申请人： Alexei Ashikhmin ,  Hien Quoc Ngo ,  Thomas L. Marzetta ,  Hong Yang

发明人： Alexei Ashikhmin ,  Hien Quoc Ngo ,  Thomas L. Marzetta ,  Hong Yang

IPC分类号： H04W74/00 ,  H04W72/12 ,  H04B7/04

CPC分类号： H04W74/008 ,  H04B7/0417 ,  H04B7/0452 ,  H04L5/0048 ,  H04L27/2613 ,  H04W72/1226

摘要： Systems and methods for assigning pilot sequences include randomly assigning pilot sequences to a population of access terminals. A first pilot sequence assigned to a worst performing access terminal of the population of access terminals is updated to a different pilot sequence that improves performance of the worst performing access terminal. A second pilot sequence assigned to a best performing access terminal of the population of access terminals is updated to another pilot sequence that reduces performance of the best performing access terminal.

摘要翻译： 用于分配导频序列的系统和方法包括将导频序列随机分配给接入终端群体。 分配给接入终端群体的最差执行接入终端的第一导频序列被更新为改进性能最差的接入终端的不同导频序列。 分配给接入终端的最佳执行接入终端的第二导频序列被更新为另一个导频序列，从而降低性能最好的接入终端的性能。

公开(公告)号：US09154208B2

公开(公告)日：2015-10-06

申请号：US13547088

申请日：2012-07-12

申请人： Hong Yang ,  Thomas L. Marzetta ,  Alexei Ashikhmin

发明人： Hong Yang ,  Thomas L. Marzetta ,  Alexei Ashikhmin

IPC分类号： H04W72/04 ,  H04B7/06 ,  H04W52/14

CPC分类号： H04B7/0619 ,  H04B7/0632 ,  H04W52/143

摘要： A new method is disclosed for providing wireless fixed access from an array of service antennas to a population of local terminals. In implementations, a service transceiver station (STS) performs beamform precoding using channel state information (CSI) obtained from transmissions by the local terminals, and the STS performs power allocation using slow fading coefficients which are static over the service antenna positions and over a frequency range spanning at least some carriers used for downlink transmission.

摘要翻译： 公开了一种用于从服务天线阵列到本地终端群的无线固定接入的新方法。 在实现中，服务收发台（STS）使用从本地终端的传输获得的信道状态信息（CSI）来执行波束形预编码，并且STS使用在服务天线位置和频率上是静态的慢衰落系数来执行功率分配 范围跨越至少一些用于下行链路传输的载波。

公开(公告)号：US09100835B2

公开(公告)日：2015-08-04

申请号：US13477579

申请日：2012-05-22

申请人： Alexei Ashikhmin ,  Thomas L. Marzetta

发明人： Alexei Ashikhmin ,  Thomas L. Marzetta

IPC分类号： H04W16/14

CPC分类号： H04W16/14

摘要： A method is provided, in which a base station allocates pilot signals to mobile terminals in a cell, obtains CSI from uplink pilot signals transmitted by mobile terminals, uses the CSI to precode messages, and transmits the messages in conformance with a TDD protocol. The CSI is obtained by comparing the pilot signal received from each mobile terminal to a known pilot signal associated with that mobile terminal. The known pilot signals are associated with respective mobile terminals according to a pilot signal reuse pattern in which adjacent cells are allocated mutually orthogonal reuse groups of mutually orthogonal pilot signals, and mobile terminals within a given cell are limited to transmitting only pilot signals allocated to that cell.

摘要翻译： 提供了一种方法，其中基站向小区中的移动终端分配导频信号，从由移动终端发送的上行导频信号中获取CSI，使用CSI对消息进行预编码，并根据TDD协议发送消息。 通过将从每个移动终端接收的导频信号与与该移动终端相关联的已知导频信号进行比较来获得CSI。 已知的导频信号根据导频信号重用模式与相应的移动终端相关联，其中相邻小区被分配相互正交的导频信号的相互正交的重用组，并且给定小区内的移动终端被限制为仅传送分配给该小区的导频信号 细胞。

公开(公告)号：US08724610B2

公开(公告)日：2014-05-13

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： H04J3/00 ,  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：US20130070621A1

公开(公告)日：2013-03-21

申请号：US13238329

申请日：2011-09-21

申请人： Thomas L. Marzetta ,  Alexei Ashikhmin ,  Paul A. Polakos

发明人： Thomas L. Marzetta ,  Alexei Ashikhmin ,  Paul A. Polakos

IPC分类号： H04W24/00 ,  H04W72/04 ,  H04L12/26

CPC分类号： H04B7/024

摘要： A communication method uses a distributed cell-free network of spatially independent service antennas. According to the method, pilot sequences are allocated to a user population of access terminals by an allocation procedure that imposes local relative orthogonality of pilot sequences. Channel coefficients for access terminals arc determined by measuring allocated pilot sequences as received by each of the service antennas. In embodiments of the invention, the determination of channel coefficients is performed independently and the resulting channel coefficients are locally stored at the respective service antennas. At each service antenna, a processor independently uses locally stored channel coefficients to precode forward link signals or to at least partially decode reverse link signals.

摘要翻译： 通信方法使用空间独立业务天线的分布式无小区网络。 根据该方法，通过施加导频序列的局部相对正交性的分配过程将导频序列分配给接入终端的用户群。 通过测量由每个服务天线接收的分配的导频序列来确定接入终端的信道系数。 在本发明的实施例中，独立地执行信道系数的确定，并将所得到的信道系数本地存储在相应的服务天线。 在每个服务天线处，处理器独立地使用本地存储的信道系数来对前向链路信号进行预编码或者至少部分地解码反向链路信号。

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：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：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。