公开(公告)号：US08208397B2

公开(公告)日：2012-06-26

申请号：US12555966

申请日：2009-09-09

申请人： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

发明人： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC分类号： H04L1/00

CPC分类号： H04B17/0047 ,  H04B7/024 ,  H04B7/0626 ,  H04B7/0639 ,  H04B17/336 ,  H04B17/364 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0019 ,  H04L1/0026 ,  H04L1/20 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224

摘要： A UE in a wireless communication network transmits succinct, direct channel state information to the network, enabling coordinated multipoint calculations such as joint processing, without substantially increasing uplink overhead. The UE receives and processes reference symbols over a set of non-uniformly spaced sub-carriers, selected according to a scheme synchronized to the network. The frequency response for each selected sub-carrier is estimated conventionally, and the results quantized and transmitted to the network on an uplink control channel. The non-uniform sub-carrier selection may be synchronized to the network in a variety of ways.

摘要翻译： 无线通信网络中的UE向网络发送简洁的直接信道状态信息，实现诸如联合处理之类的协调多点计算，而基本上不增加上行链路开销。 UE根据与网络同步的方案选择的一组非均匀间隔的子载波上接收和处理参考符号。 对于每个选择的子载波的频率响应是常规估计的，并且在上行链路控制信道上量化并传输到网络。 非均匀子载波选择可以以各种方式与网络同步。

公开(公告)号：US08199840B2

公开(公告)日：2012-06-12

申请号：US11740417

申请日：2007-04-26

申请人： Kambiz C. Zangi ,  Leonid Krasny

发明人： Kambiz C. Zangi ,  Leonid Krasny

IPC分类号： H04B7/02

CPC分类号： H04B7/0417 ,  H04B7/043 ,  H04B7/0634 ,  H04B7/0691

摘要： In MIMO systems, two or more transmit signals are transmitted from different antenna clusters having one or more transmit antennas each. A precoding circuit weight the transmit signals transmitted from each transmit antenna using a common set of frequency independent antenna weights for all antenna clusters. The antenna weights are computed based on correlations between transmit antennas in the same antenna cluster.

摘要翻译： 在MIMO系统中，从具有一个或多个发射天线的不同天线簇发射两个或更多个发射信号。 预编码电路使用对于所有天线簇的共用的一组独立于频率的天线权重对从每个发射天线发射的发射信号进行加权。 基于相同天线簇中的发射天线之间的相关性来计算天线权重。

公开(公告)号：US08107983B2

公开(公告)日：2012-01-31

申请号：US12404773

申请日：2009-03-16

申请人： Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

发明人： Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC分类号： H04B15/00 ,  H04B7/02

CPC分类号： H04B7/024

摘要： A method for determining antenna weights for use in transmitting data from a plurality of base stations to a user device is disclosed. The antenna weights are determined using an input covariance matrix (S), and the input covariance matrix is determined subject to a predetermined power constraint and a predetermined, non-zero interference constraint.

摘要翻译： 公开了一种用于确定用于从多个基站向用户设备发送数据的天线权重的方法。 使用输入协方差矩阵（S）确定天线权重，并且在预定功率约束和预定的非零干扰约束条件下确定输入协方差矩阵。

公开(公告)号：US08094762B2

公开(公告)日：2012-01-10

申请号：US12114516

申请日：2008-05-02

申请人： Leonid Krasny ,  Kambiz Zangi

发明人： Leonid Krasny ,  Kambiz Zangi

IPC分类号： H04B1/10 ,  H04B7/02

CPC分类号： H04B7/0851 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0242

摘要： A radio communication sent by a transmitter having M transmit antennas is received by a receiver having N receive antennas, where M is a positive integer greater than or equal to one and N is positive integer greater than one. Thus, N output signals, one for each receive antenna, are received. The signal transmitted from each transmit antenna includes predetermined pilot symbols known by the receiver and information symbols to be determined by the receiver. Weights for estimating each of M×N single-input/single-output channels between transmit and receive antennas are determined based on jointly processing pilot symbols received on all of the N receive antennas. The M×N channels are estimated based on the determined weights, and those estimated channels are used to determine the information symbols. An iterative procedure is used to estimate the M×N channels using a noise correlation matrix estimate and to estimate the noise correlation matrix using the M×N channel estimates.

摘要翻译： 由具有M个发射天线的发射机发送的无线电通信由具有N个接收天线的接收机接收，其中M是大于或等于1的正整数，并且N是大于1的正整数。 因此，接收每个接收天线一个N个输出信号。 从每个发送天线发送的信号包括接收机已知的预定导频符号和由接收机确定的信息符号。 基于在所有N个接收天线上接收到的导频符号共同确定用于估计发射天线和接收天线之间的每个M×N个单输入/单输出信道的权重。 基于所确定的权重来估计M×N个信道，并且使用那些估计的信道来确定信息符号。 使用迭代过程使用噪声相关矩阵估计来估计M×N个信道，并且使用M×N信道估计来估计噪声相关矩阵。

公开(公告)号：US08036099B2

公开(公告)日：2011-10-11

申请号：US11850781

申请日：2007-09-06

申请人： Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

发明人： Kambiz C. Zangi ,  Leonid Krasny ,  Dennis Hui

IPC分类号： H04L27/28 ,  H04B7/02 ,  H04Q7/00

CPC分类号： H04L5/0082 ,  H04L1/0015 ,  H04L5/0023 ,  H04L5/0058 ,  H04L25/03343 ,  H04W4/08 ,  H04W28/18 ,  H04W72/00

摘要： According to one or more method and apparatus embodiments taught herein, network base stations reduce temporal variations in the interference perceived by mobile stations operating within the network by slowing down the rate at which they change or otherwise update the linear precoding settings applied to their transmitted Orthogonal Frequency Division Multiplex (OFDM) signals in comparison to the rate at which the base stations perform link adaptation. That is, the precoding-related component of measured interference (e.g., other-cell interference) at the mobile stations is made quasi-stationary with respect to channel quality reporting and link adaptation intervals by fixing the preceding settings used by each base station over time intervals substantially longer than the channel reporting/link adaptation intervals.

摘要翻译： 根据本文教导的一个或多个方法和装置实施例，网络基站通过减慢其改变的速率或以其他方式更新应用于其发送的正交的线性预编码设置的速率来减少在网络内操作的移动站感知到的干扰的时间变化 频分复用（OFDM）信号与基站执行链路自适应的速率相比较。 也就是说，通过固定每个基站随时间推移的先前设置，相对于信道质量报告和链路自适应间隔，将移动站处的测量干扰（例如，其他小区干扰）的预编码相关分量制成准静止 间隔显着长于信道报告/链路自适应间隔。

公开(公告)号：US20090262843A1

公开(公告)日：2009-10-22

申请号：US12105313

申请日：2008-04-18

申请人： Leonid Krasny ,  Dennis Hui

发明人： Leonid Krasny ,  Dennis Hui

IPC分类号： H04L27/28

CPC分类号： H04L25/03343 ,  H04B7/0619 ,  H04B7/0626 ,  H04B7/066 ,  H04L25/0242 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Pre-coder techniques disclosed herein are based on long-term statistical channel information for reducing channel feedback overhead and transmitter complexity. In an embodiment, a receiver includes two or more receive antennas spaced approximately λ/2 apart and a baseband processor. The baseband processor computes channel correlations for different combinations of transmit antennas and each receive antenna and averages the channel correlations over the different receive antennas to form a frequency-independent channel correlation matrix. The baseband processor also computes a scalar representing noise variance at the receive antennas and feeds back the frequency-independent channel correlation matrix and the scalar for use in performing transmitter pre-coding computations.

摘要翻译： 本文公开的预编码技术基于用于减少信道反馈开销和发射机复杂度的长期统计信道信息。 在一个实施例中，接收机包括两个或更多个间隔大约λ/ 2的接收天线和基带处理器。 基带处理器为发射天线和每个接收天线的不同组合计算信道相关性，并对不同接收天线之间的信道相关进行平均，以形成与频率无关的信道相关矩阵。 基带处理器还计算表示在接收天线处的噪声方差的标量，并反馈与频率无关的信道相关矩阵和标量，以用于执行发射机预编码计算。

公开(公告)号：US07599702B2

公开(公告)日：2009-10-06

申请号：US10745051

申请日：2003-12-23

申请人： Karl James Molnar ,  Stephen James Grant ,  Leonid Krasny

发明人： Karl James Molnar ,  Stephen James Grant ,  Leonid Krasny

IPC分类号： H04W40/00

CPC分类号： H04W72/1231 ,  H04B2201/709727 ,  H04L1/20 ,  H04L5/0044 ,  H04L5/006 ,  H04W52/16 ,  H04W52/226 ,  H04W52/325 ,  H04W52/367

摘要： A base station schedules one of a plurality of mobile terminals based on an expected SIR of an effective traffic channel associated with a non-scheduled mobile terminal. The expected SIR is generated by computing the expected SIR of a hypothesized traffic channel with a pre-filter adapted to the non-scheduled mobile terminal that would result if the non-scheduled mobile terminal was scheduled. A base station then schedules transmissions to the plurality of mobile terminals based on the computed expected SIR. The expected SIR may be computed so as to compensate for mismatch between the hypothesized traffic channel and a pilot channel associated with the non-scheduled mobile terminal. Alternatively, the expected SIR may be directly computed based on an estimate of the pre-filter of the hypothesized traffic channel.

摘要翻译： 基站基于与非调度移动终端相关联的有效业务信道的期望SIR来调度多个移动终端中的一个。 通过利用适配于非调度移动终端的预滤波器来计算假设的业务信道的预期SIR来产生预期的SIR，如果非调度移动终端被调度，则将产生。 基站然后基于所计算的预期SIR调度到多个移动终端的传输。 可以计算期望的SIR，以补偿假设业务信道与与非调度移动终端相关联的导频信道之间的失配。 或者，可以基于假设的业务信道的前置过滤器的估计来直接计算预期的SIR。

公开(公告)号：US20080318613A1

公开(公告)日：2008-12-25

申请号：US12129918

申请日：2008-05-30

申请人： Kumar BALACHANDRAN ,  Leonid Krasny

发明人： Kumar BALACHANDRAN ,  Leonid Krasny

IPC分类号： H04B7/005 ,  H04B7/26

CPC分类号： H04B7/024 ,  H04B7/022 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/0663 ,  H04L1/0026 ,  H04L1/0029 ,  H04L1/0693 ,  H04L25/0216 ,  H04L25/03343 ,  H04W16/28 ,  H04W28/18 ,  H04W52/143 ,  H04W52/367 ,  H04W52/40 ,  H04W92/20

摘要： In a wireless network, plural downlink signals from plural base stations are transmitted to a terminal. The plural downlink signals all carry the same information to the terminal. The terminal provides feedback on the downlink channels. The feedback provides information on the taps of the channels. The amount of information fed back is constrained. Based on the feedback, transmission parameters of the downlink signals are adjusted. The process of transmitting, providing feedback, and adjusting the parameters continue so that the energy of the downlink signal is enhanced at the terminal location and suppressed elsewhere. Beam forming can be used to further suppress the energy signature at locations other than the terminal location.

摘要翻译： 在无线网络中，来自多个基站的多个下行链路信号被发送到终端。 多个下行链路信号都携带相同的信息给终端。 终端提供对下行链路信道的反馈。 反馈提供有关通道的抽头的信息。 反馈的信息量受到限制。 基于反馈，调整下行链路信号的传输参数。 发送，提供反馈和调整参数的过程继续进行，使得下行链路信号的能量在终端位置得到增强，并在其他地方被抑制。 波束形成可用于进一步抑制终端位置之外的位置处的能量特征。

公开(公告)号：US20080311858A1

公开(公告)日：2008-12-18

申请号：US11808769

申请日：2007-06-12

申请人： Jung-Fu Cheng ,  Leonid Krasny ,  Rajaram Ramesh

发明人： Jung-Fu Cheng ,  Leonid Krasny ,  Rajaram Ramesh

IPC分类号： H04B7/02 ,  H04B1/40 ,  H04B7/005

CPC分类号： H04B7/0682 ,  H04B7/0404 ,  H04B7/0634

摘要： Diversity radio transmission is accomplished with excellent performance using multiple antennas receiving a transmission signal from a single power amplifier. A data signal to be transmitted is provided to a first antenna, and a phase-shifted version of the data signal is applied a second antenna. The relative phase shift between the data signal transmitted over the two transmit antennas ensures the two antenna signals can be constructively combined at the receiver. In one non-limiting example embodiment, the relative phase shift is determined by processing pilot signals sent along with the data signal and which are transmitted with predetermined phase shifts.

摘要翻译： 使用接收来自单个功率放大器的传输信号的多个天线，以卓越的性能来实现分集无线电传输。 要发送的数据信号被提供给第一天线，并且数据信号的相移版本被应用于第二天线。 通过两个发射天线发射的数据信号之间的相对相移确保了两个天线信号可以在接收机上被建设性地组合。 在一个非限制性示例实施例中，相对相移通过处理与数据信号一起发送并且以预定相移发送的导频信号来确定。

公开(公告)号：US20080310523A1

公开(公告)日：2008-12-18

申请号：US11763192

申请日：2007-06-14

申请人： Dennis Hui ,  Leonid Krasny

发明人： Dennis Hui ,  Leonid Krasny

IPC分类号： H04L7/02

CPC分类号： H04B7/0417 ,  H04B7/0426 ,  H04B7/0626 ,  H04L1/0675 ,  H04L25/0206 ,  H04L27/2601

摘要： Multi-antenna transmission control presented herein involves generating a set of virtual channel realizations at the transmitter that shares the same second-order statistics as the actual channel realizations observed for a targeted receiver. By making the control-related quantities of interest at the transmitter depend on the long-term statistics of the channel, the actual channel realizations are not needed for transmission control, e.g., for accurate Multiple-Input-Multiple-Output (MIMO) preceding. As such, the use of virtual channel realizations enables transmission control that approaches the “closed-loop” channel capacity that would be provided by full feedback of the (instantaneous) actual channel realizations, without requiring the overhead signaling burden that attends full feedback.

摘要翻译： 本文提出的多天线传输控制涉及在发射机处生成一组虚拟信道实现，其共享与针对目标接收机观察到的实际信道实现相同的二阶统计。 通过使发射机处的控制相关数量取决于信道的长期统计，例如对于精确的多输入多输出（MIMO）预编码，传输控制不需要实际的信道实现。 因此，虚拟信道实现的使用使得接近将通过（瞬时）实际信道实现的完全反馈提供的“闭环”信道容量的传输控制，而不需要出现完全反馈的开销信令负担。