公开(公告)号：US20110080964A1

公开(公告)日：2011-04-07

申请号：US12808141

申请日：2007-12-12

Applicant: Davood Shamsi ,  Kiarash Amiri ,  Behnaam Aazhang ,  Joseph R. Cavallaro ,  Jorma Olavi Lilleberg

Inventor： Davood Shamsi ,  Kiarash Amiri ,  Behnaam Aazhang ,  Joseph R. Cavallaro ,  Jorma Olavi Lilleberg

IPC: H04L27/28

CPC classification number: H04B7/0619 ,  H04B7/0417

Abstract: A method for beamforming is described. The method includes generating a pseudo-random unitary matrix. A first codebook is rotated with the pseudo-random unitary matrix. The method includes generating a second codebook based upon the rotated codebook and a correlation matrix. A codeword is selected from the second codebook using a channel matrix. The correlation matrix is updated based upon the selected codeword. The method includes transmitting an index of the selected codeword in the codebook. The method includes receiving the codeword index. A codebook is consulted using the codeword index to locate a codeword. Beamforming is performed based upon the located codeword. An apparatus is also described.

Abstract translation: 描述了波束成形的方法。 该方法包括生成伪随机酉矩阵。 第一码本用伪随机酉矩阵旋转。 该方法包括基于旋转的码本和相关矩阵生成第二码本。 使用信道矩阵从第二码本中选择码字。 基于选择的码字来更新相关矩阵。 该方法包括在码本中发送所选码字的索引。 该方法包括接收码字索引。 使用码字索引查询码本以定位码字。 基于定位的码字执行波束形成。 还描述了一种装置。

公开(公告)号：US07821980B2

公开(公告)日：2010-10-26

申请号：US11498272

申请日：2006-08-03

Applicant: Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04B7/14 ,  H04J1/10 ,  H04J3/08 ,  G01R31/08 ,  H04L1/00

CPC classification number: H04L1/0045 ,  H04B7/155 ,  H04B7/2606 ,  H04L2001/0097

Abstract: A method including transmitting a binary vector from a source node to a relay node and receiving a signal vector at the relay node. The method also includes compressing the signal at the relay node by multiplying the signal with a matrix using probabilities and converting output probabilities from the multiplying into retransmission signal amplitudes, the signal amplitude depending not only on a probability of a bit but on a transmission power constraint at the relay node. The method also includes transmitting, by the relay node, estimates of information from the source node to a destination node.

Abstract translation: 一种方法，包括从源节点向中继节点发送二进制向量并在中继节点处接收信号向量。 该方法还包括通过使用概率将信号与矩阵相乘来压缩中继节点处的信号，并将输出概率从乘法转换为重发信号幅度，信号幅度不仅取决于比特的概率，而且取决于发射功率约束 在中继节点。 该方法还包括由中继节点发送从源节点到目的地节点的信息估计。

公开(公告)号：US07336727B2

公开(公告)日：2008-02-26

申请号：US10923056

申请日：2004-08-19

Applicant: Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04L27/00

CPC classification number: H04B7/0417 ,  H04B7/043 ,  H04B7/0443 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0663

Abstract: The telecommunications system described herein implements a multi-rank beamformer for use in wireless systems equipped with multiple transmit and multiple receive antennas. The multi-rank beamformer uses finite-rate feedback of channel conditions to achieves close to theoretical performance indicated by the water-filling algorithm, while avoiding the computational complexity associated with space time codes. In addition, the multi-rank beamforming system described herein improves on the performance of unit rank beamforming methods by maintaining the gains over space time codes over a broader range of transmission rates.

Abstract translation: 本文描述的电信系统实现用于配备有多个发射和多个接收天线的无线系统中的多等级波束形成器。 多级波束形成器使用信道条件的有限速率反馈来实现接近灌水算法所指示的理论性能，同时避免与时空码相关的计算复杂度。 另外，本文描述的多级波束成形系统通过在更宽的传输速率范围内保持空间时间码的增益来改善单位秩波束成形方法的性能。

公开(公告)号：US07330701B2

公开(公告)日：2008-02-12

申请号：US10533248

申请日：2003-10-29

Applicant: Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Krishna Kiran Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04B1/00 ,  H04B7/00

CPC classification number: H04B7/0639 ,  H01Q21/00 ,  H04B7/0443 ,  H04B7/0617 ,  H04B7/0669 ,  H04W52/42

Abstract: Beamforming systems having a few bits of channel state information fed back to the transmitter benefit from low complexity decoding structures and performances gains compared with systems that do not have channel state feedback. Both unit rank and higher rank systems are implemented. Substantial design effort may be avoided by following a method of using functions formulated for space-time systems with the change that the channel coherence time is equated to the number of transmit antennas and the number of antennas in the space-time formulation is fixed at one.

Abstract translation: 具有反馈到发射机的几比特信道状态信息的波束成形系统与没有信道状态反馈的系统相比，受益于低复杂性解码结构和性能增益。 实现了单位级和高级制。 通过遵循使用为空时系统制定的功能的方法可以避免大量的设计努力，其中信道相干时间等于发射天线的数量，并且时空公式中的天线数量固定在一个 。

公开(公告)号：US20050255808A1

公开(公告)日：2005-11-17

申请号：US11094093

申请日：2005-03-29

Applicant: Nasir Ahmed ,  Mohammad Khojastepour ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Nasir Ahmed ,  Mohammad Khojastepour ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: H04B7/005 ,  H04B7/14

CPC classification number: H04W52/46 ,  H04B7/15592 ,  H04W24/00 ,  H04W52/42 ,  H04W88/04

Abstract: A method for reducing outages in a cooperative network comprising measuring a channel gain for each of a plurality of received signals one of the received signals comprising a source signal, executing an algorithm utilizing the channel gain of the source signal and at least one other of the plurality of channel gains to determine a source transmit power value, and transmitting the source transmit power value to the source.

Abstract translation: 一种用于减少合作网络中的停机的方法，包括：测量多个接收信号中的每一个的信道增益，所述接收信号中的一个包括源信号，使用所述源信号的信道增益和所述源信号的至少另一个执行算法 多个信道增益以确定源发射功率值，以及将源发射功率值发送到源。

公开(公告)号：US07839940B2

公开(公告)日：2010-11-23

申请号：US11285590

申请日：2005-11-21

Applicant: Mohammad Jaber Borran ,  Behnaam Aazhang ,  Prabodh Varshney

Inventor： Mohammad Jaber Borran ,  Behnaam Aazhang ,  Prabodh Varshney

IPC: H04K1/10 ,  H04J11/00 ,  H04L12/28 ,  G08C25/02

CPC classification number: H04L1/1845 ,  H04L1/0026 ,  H04L1/1803 ,  H04L1/1893 ,  H04L27/2601

Abstract: A first data symbol that includes a kth data bit is received over a multicarrier system. A first channel quality parameter is estimated for the first data symbol. A second data symbol that includes a retransmitted kth data bit is received. A second channel quality parameter for the second data symbol is estimated. A probable value of the kth data bit is determined based on both the first channel quality parameter and the second channel quality parameter. In response to an ARQ for data symbols communicated over a multicarrier system, the following are performed: determining channel quality parameters, each of the channel quality parameters corresponding to at least one of the transmitted data symbols; selecting a subset of the channel quality parameters exhibiting a worst quality; constructing a block of data symbols corresponding to the subset; and communicating the block of data symbols over a plurality of subcarriers.

Abstract translation: 通过多载波系统接收包括第k个数据位的第一数据符号。 对于第一数据符号估计第一信道质量参数。 接收包括重传的第k个数据位的第二数据符号。 估计第二数据符号的第二信道质量参数。 基于第一信道质量参数和第二信道质量参数来确定第k个数据比特的可能值。 响应于通过多载波系统传送的数据符号的ARQ，执行以下操作：确定信道质量参数，每个信道质量参数对应于所发送的数据符号中的至少一个; 选择显示最差质量的信道质量参数的子集; 构造对应于该子集的数据符号块; 以及在多个子载波上传送数据符号块。

公开(公告)号：US20080052608A1

公开(公告)日：2008-02-28

申请号：US11498272

申请日：2006-08-03

Applicant: Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

Inventor： Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

IPC: G06F11/08

CPC classification number: H04L1/0045 ,  H04B7/155 ,  H04B7/2606 ,  H04L2001/0097

Abstract: A method including transmitting a binary vector from a source node to a relay node and receiving a signal vector at the relay node. The method also includes compressing the signal at the relay node by multiplying the signal with a matrix using probabilities and converting output probabilities from the multiplying into retransmission signal amplitudes, the signal amplitude depending not only on a probability of a bit but on a transmission power constraint at the relay node. The method also includes transmitting, by the relay node, estimates of information from the source node to a destination node.

Abstract translation: 一种方法，包括从源节点向中继节点发送二进制向量并在中继节点处接收信号向量。 该方法还包括通过使用概率将信号与矩阵相乘来压缩中继节点处的信号，并将输出概率从乘法转换为重发信号幅度，信号幅度不仅取决于比特的概率，而且取决于发射功率约束 在中继节点。 该方法还包括由中继节点发送从源节点到目的地节点的信息估计。

公开(公告)号：US06529495B1

公开(公告)日：2003-03-04

申请号：US09317333

申请日：1999-05-24

Applicant: Behnaam Aazhang ,  Joseph R. Cavallaro ,  Gang Xu

Inventor： Behnaam Aazhang ,  Joseph R. Cavallaro ,  Gang Xu

IPC: H04B7216

CPC classification number: H04B1/71052 ,  H04B1/71075

Abstract: A multistage detector is disclosed that maximizes computation power while minimizing system delay. The differencing multistage detector receives signals from a plurality of users in a cell of a communications system and reduces the effect of multiple access interference to a signal from a desired user caused by interference from other users in the cell. The differencing multistage detector includes a plurality of stages, each stage including an interference canceller for removing intra-cell interference caused by the other users in the cell and producing an estimation output vector, wherein except for a first stage, the estimation output vector of a current stage is based on both a decision of the interference canceller of the current stage and the output from an interference canceller of a previous stage. The estimation output vector of a current stage is produced by combining the output from an interference canceller of a previous stage and the decision of the interference canceller of the current stage. Except for the first stage each interference canceller calculates an estimate of multi-user interference by computing a product of a cross-correlation of the received signals and a difference signal thereby reducing the number of multiplication operations required.

Abstract translation: 公开了一种最大化计算能力同时最小化系统延迟的多级检测器。 差分多级检测器从通信系统的小区中的多个用户接收信号，并且减少由来自小区中其他用户的干扰引起的来自期望用户的信号的多址接入干扰的影响。 差分多级检测器包括多级，每级包括干扰消除器，用于消除由小区中的其他用户引起的小区内干扰，并产生估计输出向量，其中除了第一级以外，估计输出向量 当前阶段基于当前阶段的干扰消除器的决定和来自前一级的干扰消除器的输出。 通过组合来自前一级的干扰消除器的输出和当前级的干扰消除器的判定来产生当前级的估计输出向量。 除了第一阶段之外，每个干扰消除器通过计算接收信号的互相关乘积和差分信号来计算多用户干扰的估计，从而减少所需的乘法运算次数。

公开(公告)号：US20090016415A1

公开(公告)日：2009-01-15

申请号：US11827717

申请日：2007-07-12

Applicant: Arnab Chakrabarti ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Jorma Lilleberg

Inventor： Arnab Chakrabarti ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Jorma Lilleberg

IPC: H04L25/52 ,  H04B7/204

CPC classification number: H03M7/30

Abstract: Thus, the exemplary embodiments of the invention describe methods, computer program products and apparatus that provide improved quantization, as may be useful within the context of a communication system (e.g., a wireless communication system) that has a relay node. In one non-limiting, exemplary embodiment, a method includes: receiving a transmission having source data from an information source; determining an estimate of the source data using a quantization technique based on maximizing data throughput; and transmitting a message including the determined estimate towards an information destination.

Abstract translation: 因此，本发明的示例性实施例描述了在具有中继节点的通信系统（例如，无线通信系统）的上下文中可能有用的提供改进的量化的方法，计算机程序产品和装置。 在一个非限制性的示例性实施例中，一种方法包括：从信息源接收具有源数据的传输; 使用基于最大化数据吞吐量的量化技术来确定源数据的估计; 以及向所述信息目的地发送包括所确定的估计的消息。

公开(公告)号：US07088784B2

公开(公告)日：2006-08-08

申请号：US10678546

申请日：2003-10-02

Applicant: Mohammad Jaber Borran ,  Behnaam Aazhang

Inventor： Mohammad Jaber Borran ,  Behnaam Aazhang

IPC: H04L5/12

CPC classification number: H04L1/006 ,  H04L1/0054 ,  H04L27/3433

Abstract: A signal constellation is optimized for trellis coded modulation in fast fading channels, where the receiver does not have perfect knowledge of the channel parameters. Specifically, the signal constellation is partitioned into 2n mutually exclusive subsets, each preferably defining two points. Points within each subset are separated from one another by a distance between conditional distributions, preferably a Kullback-Leibler (KL) distance. For a block m=k1+k2 of information bits input into a trellis coder 30, the k1 bits are trellis encoded into n bits (n>k1) and used to select a subset of the constellation. The k2 bit(s) is/are used to select a particular point within the subset. Because the inter-subset distance between points is a KL distance that is effectively greater than a Euclidean distance, error at the receiver is substantially reduced, especially at higher SNR. Using a KL distance ensures statistics of channel fading are inherent within the signal constellation.

Abstract translation: 信号星座对于快速衰落信道中的网格编码调制进行了优化，其中接收机不具有对信道参数的完全了解。 具体地说，将信号星座分成2个互斥子集，每个子​​集优选地定义两个点。 每个子集内的点彼此间隔开条件分布之间的距离，最好是Kullback-Leibler（KL）距离。 对于输入到网格编码器30的信息比特的块m = k 1/2＆lt; 2＆lt; 2＆lt; 1＆lt; 1＆gt;比特，被编码成n个 位（n> k <1> 1）并用于选择星座的子集。 使用k 2位来选择子集内的特定点。 因为点之间的子集间距离是有效地大于欧几里德距离的KL距离，所以在接收机处的误差显着降低，特别是在较高的SNR时。 使用KL距离可确保信号衰落的统计信息在信号星座内是固有的。