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。

公开(公告)号：US20080300004A1

公开(公告)日：2008-12-04

申请号：US11969002

申请日：2008-01-03

申请人： Kumar Balachandran ,  Leonid Krasny

发明人： Kumar Balachandran ,  Leonid Krasny

IPC分类号： H04Q7/22

CPC分类号： H04W52/267 ,  H04B7/024 ,  H04B7/0452 ,  H04B7/0617 ,  H04W24/02 ,  H04W52/146 ,  H04W52/241 ,  H04W52/34 ,  H04W72/0473

摘要： A base station maximizes a uplink data transmission rate from multiple mobiles treated by the base station as a virtual single uplink transmitter. The base station identifies a set of mobile stations as a candidate transmitting set and determines a transmit power allowable from the mobile stations in the candidate transmitting set. A subset of those mobile stations in the candidate transmitting set is identified. Uplink data transmission rates are assigned and communicated to the subset of mobile stations in the candidate transmitting set so as to optimize a total number of bits processed by the base station associated with the uplink transmissions received from the subset of candidate mobile stations. The optimization may accomplish one or more objectives in addition to optimizing the total number of bits processed.

摘要翻译： 基站使由基站处理的多个移动台的上行链路数据传输速率最大化为虚拟单个上行链路发射机。 基站将一组移动站识别为候选发送集合，并确定候选发送集合中的移动台允许的发送功率。 识别候选发送集合中的那些移动站的子集。 分配上行链路数据传输速率并将其传送到候选发送集合中的移动站的子集，以便优化与从候选移动站的子集接收到的上行链路传输相关联的基站处理的比特的总数。 除了优化处理的总位数之外，优化可以实现一个或多个目标。

公开(公告)号：US07376192B2

公开(公告)日：2008-05-20

申请号：US10897250

申请日：2004-07-22

申请人： Havish Koorapaty ,  Rajaram Ramesh ,  Leonid Krasny

发明人： Havish Koorapaty ,  Rajaram Ramesh ,  Leonid Krasny

IPC分类号： H04L27/00

CPC分类号： H04B7/0626 ,  H04B7/0641 ,  H04L25/0214 ,  H04L25/0228 ,  H04L25/03343 ,  H04L2025/03802

摘要： A method is described herein for reducing the number of feedback bits needed to send channel state information over a feedback channel from a receiving unit (e.g., mobile terminal, base station) to a transmitter unit (e.g., base station, mobile terminal) in a wireless communication system. In the embodiment, the receiver unit is capable of performing the following steps: (1) receiving a pilot signal from a transmit antenna located at a transmitter unit; (2) analyzing a channel tap associated with the transmit antenna and exploiting the temporal correlations of the channel tap to generate the following (i) a delta-modulated feedback bit indicative of a real part of a complex coefficient of the channel tap associated with the transmit antenna and (ii) a delta-modulated feedback bit indicative of an imaginary part of the complex coefficient of the channel tap associated with the transmit antenna; and (3) sending the two feedback bits over a feedback channel to the transmitter unit which analyzes the two feedback bits, and other feedback bits corresponding to other channel taps of this and other transmit antennas, to optimize the subsequent transmission of data to the receiver unit.

摘要翻译： 本文描述了一种用于减少在反馈信道上从在接收单元（例如，移动终端，基站）到发射机单元（例如，基站，移动终端）中的发送单元（例如，基站，移动终端）发送信道状态信息所需的反馈比特数的方法 无线通信系统。 在实施例中，接收机单元能够执行以下步骤：（1）从位于发射机单元的发射天线接收导频信号; （2）分析与发射天线相关联的信道抽头并利用信道抽头的时间相关性来生成以下（i）增量调制反馈比特，其表示与该信道抽头相关联的信道抽头的复系数的实部 发射天线和（ii）指示与发射天线相关联的信道分支的复系数的虚部的Δ调制反馈比特; 和（3）通过反馈信道将两个反馈比特发送到分析两个反馈比特的发射机单元以及对应于该和其它发射天线的其它信道抽头的其它反馈比特，以优化随后向接收机发送数据 单元。

公开(公告)号：US20060079221A1

公开(公告)日：2006-04-13

申请号：US11254172

申请日：2005-10-19

申请人： Stephen Grant ,  Jung-Fu Cheng ,  Yi-Pin Wang ,  Karl Molnar ,  Leonid Krasny

发明人： Stephen Grant ,  Jung-Fu Cheng ,  Yi-Pin Wang ,  Karl Molnar ,  Leonid Krasny

IPC分类号： H04Q7/20

CPC分类号： H04B7/0645 ,  H04B1/71072 ,  H04B1/712 ,  H04B7/04 ,  H04B7/06 ,  H04B7/0632 ,  H04B7/0689 ,  H04B7/0691 ,  H04B7/0697 ,  H04B7/0891 ,  H04L1/06

摘要： In a selective MIMO system, the mobile station provides channel quality feedback for one or more possible transmission mode. The mobile station provides channel quality feedback for a first mode regardless of channel conditions and determines whether to provide feedback for one or more additional modes based on current channel conditions.

摘要翻译： 在选择性MIMO系统中，移动台为一个或多个可能的传输模式提供信道质量反馈。 无论频道条件如何，移动台都提供第一模式的信道质量反馈，并根据当前的信道状况确定是否为一个或多个附加模式提供反馈。

公开(公告)号：US20050250544A1

公开(公告)日：2005-11-10

申请号：US10841911

申请日：2004-05-07

申请人： Stephen Grant ,  Yi-Pin Wang ,  Rajaram Ramesh ,  Karl Molnar ,  Jung-Fu Cheng ,  Leonid Krasny

发明人： Stephen Grant ,  Yi-Pin Wang ,  Rajaram Ramesh ,  Karl Molnar ,  Jung-Fu Cheng ,  Leonid Krasny

IPC分类号： H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04B1/38

CPC分类号： H04L1/0002 ,  H04B7/06 ,  H04B7/061 ,  H04B7/0639 ,  H04B7/0691 ,  H04B7/0697 ,  H04L1/0025 ,  H04L1/0029 ,  H04L1/06 ,  Y02D50/10

摘要： A method is described herein that enables a Selective-Per-Antenna-Rate-Control (S-PARC) technique to be effectively implemented in a wireless communications network (e.g., HSPDA third generation communications network). In one embodiment, the method enables the S-PARC technique to be implemented in the wireless communications network by enabling a mobile terminal device to generate and transmit a “full” feedback signal to a base station that analyzes the “full” feedback signal and determines which mode and transmission rate(s) are going to be used to transmit data substream(s) from selected transmit antenna(s) to the mobile terminal device. In another embodiment, the method enables the S-PARC technique to be implemented in the wireless communications network by enabling a mobile terminal device to generate and transmit a “reduced” feedback signal to a base station that analyzes the “reduced” feedback signal and determines which mode and transmission rate(s) are going to be used to transmit data substream(s) from selected transmit antenna(s) to the mobile terminal device.

摘要翻译： 本文描述了一种能够在无线通信网络（例如，HSPDA第三代通信网络）中有效实现选择性天线速率控制（S-PARC）技术的方法。 在一个实施例中，该方法使得能够在无线通信网络中实现S-PARC技术，使得移动终端设备能够生成并向基站发送“全”反馈信号，分析“完整”反馈信号并确定 哪个模式和传输速率将用于将数据子流从所选择的发射天线传送到移动终端设备。 在另一个实施例中，该方法使得能够在无线通信网络中实现S-PARC技术，使得移动终端设备能够生成并向基站发送“减少”的反馈信号，该基站分析“减少的”反馈信号并确定 哪个模式和传输速率将用于将数据子流从所选择的发射天线传送到移动终端设备。

公开(公告)号：US06738481B2

公开(公告)日：2004-05-18

申请号：US09757962

申请日：2001-01-10

申请人： Leonid Krasny ,  Ali S. Khayrallah

发明人： Leonid Krasny ,  Ali S. Khayrallah

IPC分类号： H04B1500

CPC分类号： G10L21/0208 ,  G10L2021/02166

摘要： A method and noise reduction apparatus comprises a microphone array including a plurality of microphone elements for receiving a training signal including a plurality of training signal samples, and a working signal including a plurality of working signal samples, and at least one frequency domain convertor coupled to the plurality of microphone elements for converting the plurality of training signal samples and the plurality of working signal samples to the frequency domain. A signal spatial correlation matrix estimator is coupled to the at least one frequency domain convertor for estimating a signal spatial correlation matrix using the converted plurality of training signal samples. An inverse noise spatial correlation matrix estimator is coupled to the at least one frequency domain convertor for estimating an inverse noise spatial correlation matrix using the converted plurality of working signal samples. A constrained output generator is coupled to the at least one frequency domain convertor, the signal spatial correlation matrix estimator and the inverse noise spatial correlation matrix estimator for generating a constrained output for the noise reduction apparatus using the converted working signal samples, the estimated signal spatial correlation matrix and the estimated inverse noise spatial correlation matrix.

摘要翻译： 一种方法和降噪装置包括麦克风阵列，其包括多个麦克风元件，用于接收包括多个训练信号样本的训练信号，以及包括多个工作信号采样的工作信号，以及至少一个频域转换器， 所述多个麦克风元件用于将所述多个训练信号样本和所述多个工作信号样本转换成所述频域。 信号空间相关矩阵估计器耦合到所述至少一个频域转换器，用于使用所转换的多个训练信号采样来估计信号空间相关矩阵。 反相噪声空间相关矩阵估计器被耦合到所述至少一个频域转换器，用于使用所转换的多个工作信号采样来估计逆噪声空间相关矩阵。 约束输出发生器耦合到至少一个频域转换器，信号空间相关矩阵估计器和反相噪声空间相关矩阵估计器，用于使用转换的工作信号采样来生成用于降噪装置的约束输出，估计信号空间 相关矩阵和估计的反噪声空间相关矩阵。