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    SYSTEM AND METHOD FOR RANDOMIZED ANTENNA ALLOCATION IN ASYNCHRONOUS MIMO MULTI-HOP NETWORKS
    1.
    发明申请
    SYSTEM AND METHOD FOR RANDOMIZED ANTENNA ALLOCATION IN ASYNCHRONOUS MIMO MULTI-HOP NETWORKS 有权
    异步MIMO多用户网络中随机天线分配的系统与方法

    公开(公告)号：US20090304096A1

    公开(公告)日：2009-12-10

    申请号：US12132927

    申请日：2008-06-04

    申请人： Ahmed Khattab ,  Ashutosh Sabharwal ,  Edward W. Knightly

    发明人： Ahmed Khattab ,  Ashutosh Sabharwal ,  Edward W. Knightly

    IPC分类号： H04K1/10

    CPC分类号： H04L27/00 ,  H04B7/0413 ,  H04B7/0691 ,  H04B7/0874

    摘要： A system and method for simultaneous and asynchronous transmissions in multi-antenna multi-hop networks. The system and method employ randomized and non-greedy resource allocation to counter starvation. The system and method define a class of asynchronous random access protocols subsuming MIMO systems via two components. Residual Capacity Estimation and Randomized Resource Allocation. The system and method realize the first asynchronous MIMO MAC protocol that counters flow starvation in multi-hop networks. Randomized and non-greedy antenna allocation coupled with local residual capacity estimation results in previously-starving nodes capturing a fair share of system resources while simultaneously exploiting throughput gains available to multi-antenna systems.

    摘要翻译： 一种用于多天线多跳网络同步和异步传输的系统和方法。 该系统和方法采用随机和非贪心资源分配来应对饥饿。 该系统和方法通过两个组件定义了一类异步随机接入协议，分组MIMO系统。 剩余容量估算和随机资源分配。 该系统和方法实现了多跳网络中流量不足的第一种异步MIMO MAC协议。 随机和非贪心天线分配与局部剩余容量估计相结合，导致先前挨饿的节点捕获公平的系统资源份额，同时利用多天线系统可用的吞吐量增益。

    Variable rate soft information forwarding
    2.
    发明申请
    Variable rate soft information forwarding 失效
    可变速率软信息转发

    公开(公告)号：US20080052608A1

    公开(公告)日：2008-02-28

    申请号：US11498272

    申请日：2006-08-03

    申请人： Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

    发明人： Arnab Chakrabarti ,  Alexandre de Baynast ,  Ashutosh Sabharwal ,  Behnaam Aazhang

    IPC分类号： G06F11/08

    CPC分类号： H04L1/0045 ,  H04B7/155 ,  H04B7/2606 ,  H04L2001/0097

    摘要： 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.

    摘要翻译： 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。

    System and method for full duplex cancellation
    3.
    发明授权
    System and method for full duplex cancellation 有权
    用于全双工取消的系统和方法

    公开(公告)号：US08842584B2

    公开(公告)日：2014-09-23

    申请号：US13549189

    申请日：2012-07-13

    申请人： Rittwik Jana ,  Vaneet Aggarwal ,  Christopher W. Rice ,  Nemmara K. Shankaranarayanan ,  Melissa Duarte ,  Ashutosh Sabharwal

    发明人： Rittwik Jana ,  Vaneet Aggarwal ,  Christopher W. Rice ,  Nemmara K. Shankaranarayanan ,  Melissa Duarte ,  Ashutosh Sabharwal

    IPC分类号： H04B7/005 ,  H04L5/16

    CPC分类号： H04L5/1461 ,  H04B15/00 ,  H04L5/14 ,  H04L5/143 ,  H04L27/265

    摘要： Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal.

    摘要翻译： 这里公开的是用于实现全双工通信中的自干扰的改进的消除或在单个频带中的通信的发送和接收而不需要时间，频率或代码划分的系统，方法和计算机可读存储介质。 该系统估计自干扰信号的信号强度和相位，基于该估计产生消除信号，然后在采集接收的模拟信号之前使用消除信号来抑制自干扰。 应用消除信号后，系统对剩余的模拟信号进行采样和数字化。 然后对数字化信号进行附加数字消除，允许提取所需信号。

    Methods, computer program products and apparatus providing improved quantization
    5.
    发明授权
    Methods, computer program products and apparatus providing improved quantization 有权
    方法，提供改进量化的计算机程序产品和装置

    公开(公告)号：US08243756B2

    公开(公告)日：2012-08-14

    申请号：US11827717

    申请日：2007-07-12

    申请人： Arnab Chakrabarti ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Jorma Lilleberg

    发明人： Arnab Chakrabarti ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Jorma Lilleberg

    IPC分类号： H04J3/18 ,  H04B7/02 ,  H04L1/02 ,  H04L27/18

    CPC分类号： H03M7/30

    摘要： 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.

    摘要翻译： 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。

    Partially coherent constellations for multiple-antenna systems
    6.
    发明授权
    Partially coherent constellations for multiple-antenna systems 失效
    多天线系统的部分相干星座

    公开(公告)号：US07889804B2

    公开(公告)日：2011-02-15

    申请号：US10671346

    申请日：2003-09-24

    申请人： Mohammad Jaber Borran ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Prabodh Varshney

    发明人： Mohammad Jaber Borran ,  Ashutosh Sabharwal ,  Behnaam Aazhang ,  Prabodh Varshney

    IPC分类号： H04B7/02

    CPC分类号： H04L25/0202 ,  H04L1/0612 ,  H04L27/3427

    摘要： A signal constellation for a multiple input/multiple output (MIMO) communication system when channel knowledge at the receiver is imperfect includes at least two (n−1)-dimensional sub-constellations of points that together form an n-dimensional constellation, the number n representing real dimensions and n=2M where M is the number of transmit antennas. The n-dimensional spherical constellation may define a single sphere or a plurality of concentric subset spheres, and points between subsets are separated by a Kullback-Leibler distance rather than a Euclidian distance. Each sphere has sub-constellations that preferably are arranged in symmetric pairs that define equal numbers of points that lie in parallel planes, to allow recursive construction that minimizes computational complexity. An appropriate constellation may be chosen by ceasing a search once the optimum minimum distance stops increasing as a number of the concentric levels increases.

    摘要翻译： 当接收机的信道知识不完美时，用于多输入/多输出（MIMO）通信系统的信号星座包括一起形成n维星座的点的至少两（n-1）维子星座， n表示实际尺寸，n = 2M，其中M是发射天线的数量。 n维球形星座可以定义单个球体或多个同心子集球体，并且子集之间的点由Kullback-Leibler距离而不是欧几里得距离分开。 每个球体具有优选以对称对布置的子星座，其限定位于平行平面中的相等数量的点，以允许最小化计算复杂度的递归构造。 一旦适当的星座可以通过停止搜索，一旦最佳最小距离随着同心级数的增加而停止增加。

    Method and apparatus to establish for imperfect channel state information at a receiver
    7.
    发明申请
    Method and apparatus to establish for imperfect channel state information at a receiver 审中-公开
    在接收机处建立不完善的信道状态信息的方法和装置

    公开(公告)号：US20060203941A1

    公开(公告)日：2006-09-14

    申请号：US10523167

    申请日：2003-05-29

    申请人： Mohammad Borran ,  Ashutosh Sabharwal ,  Bahnaam Aazhang

    发明人： Mohammad Borran ,  Ashutosh Sabharwal ,  Bahnaam Aazhang

    IPC分类号： H04L27/06 ,  H03D1/04

    CPC分类号： H04L27/3416 ,  H04L1/0003 ,  H04L1/0618 ,  H04L1/0625 ,  H04L1/0631 ,  H04L25/0202 ,  H04L25/0212 ,  H04L27/2078 ,  H04L27/3405 ,  H04L27/3472

    摘要： The system and method utilize design criteria and construction for signal constellations in communication systems, such as cellular telephony, that have imperfect channel state information at the receiver. The system and method assume an imperfect knowledge of fading channel state information (600B) and statistics of channel fading (600D) are used to encode additional information into the space-time matrix signal constellation as variations in amplitude of constellation (600E) points. In the preferred embodiment space-time matrix constellations and design criterion are based on the Kullback-Leibler distance between conditional distributions.

    摘要翻译： 该系统和方法利用在接收机处具有不完善信道状态信息的诸如蜂窝电话的通信系统中的信号星座的设计标准和结构。 该系统和方法假设对衰落信道状态信息（600B）的不完全知识和信道衰落（600D）的统计信号用于将附加信息编码为时空矩阵信号星座作为星座振幅（600E）的变化， 积分 在优选实施例中，空时矩阵星座和设计标准基于条件分布之间的Kullback-Leibler距离。

    Low complexity beamformers for multiple transmit and receive antennas
    8.
    发明申请
    Low complexity beamformers for multiple transmit and receive antennas 失效
    用于多个发射和接收天线的低复杂度波束形成器

    公开(公告)号：US20060111148A1

    公开(公告)日：2006-05-25

    申请号：US10533248

    申请日：2003-10-29

    申请人： Krishna Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

    发明人： Krishna Mukkavilli ,  Ashutosh Sabharwal ,  Behnaam Aazhang

    IPC分类号： H04B7/00

    CPC分类号： H04B7/0639 ,  H01Q21/00 ,  H04B7/0443 ,  H04B7/0617 ,  H04B7/0669 ,  H04W52/42

    摘要： 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.

    摘要翻译： 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 。

    SYSTEM AND METHOD FOR FULL DUPLEX CANCELLATION
    10.
    发明申请
    SYSTEM AND METHOD FOR FULL DUPLEX CANCELLATION 有权
    全双工CANCELLATION的系统和方法

    公开(公告)号：US20140016515A1

    公开(公告)日：2014-01-16

    申请号：US13549189

    申请日：2012-07-13

    申请人： Rittwik JANA ,  Vaneet AGGARWAL ,  Christopher W. RICE ,  Nemmara K. SHANKARANARAYANAN ,  Melissa DUARTE ,  Ashutosh SABHARWAL

    发明人： Rittwik JANA ,  Vaneet AGGARWAL ,  Christopher W. RICE ,  Nemmara K. SHANKARANARAYANAN ,  Melissa DUARTE ,  Ashutosh SABHARWAL

    IPC分类号： H04B15/00 ,  H04L5/14

    CPC分类号： H04L5/1461 ,  H04B15/00 ,  H04L5/14 ,  H04L5/143 ,  H04L27/265

    摘要： Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal.

    摘要翻译： 这里公开的是用于实现全双工通信中的自干扰的改进的消除或在单个频带中的通信的发送和接收而不需要时间，频率或代码划分的系统，方法和计算机可读存储介质。 该系统估计自干扰信号的信号强度和相位，基于该估计产生消除信号，然后在采集接收的模拟信号之前使用消除信号来抑制自干扰。 应用消除信号后，系统对剩余的模拟信号进行采样和数字化。 然后对数字化信号进行附加数字消除，允许提取所需信号。