公开(公告)号：US20120082259A1

公开(公告)日：2012-04-05

申请号：US13252650

申请日：2011-10-04

Applicant: Guosen Yue ,  Narayan Prasad ,  Meilong Jiang ,  Sampath Rangarajan

Inventor： Guosen Yue ,  Narayan Prasad ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04L25/03 ,  H04B15/00

CPC classification number: H04B7/0456 ,  H04L1/0618 ,  H04L1/1896 ,  H04L25/03343 ,  H04L2025/03426

Abstract: A method includes obtaining a precoder for retransmission of one codeword responsive to a known precoding matrix of a certain rank and modulation and coding scheme assignments used in an original transmission, and a desired retransmission rank', forming an approximate channel covariance matrix; stimating an a minimum mean square error receiver signal-to-noise-interference-ratio for each layer to be retransmitted responsive to the prior forming; and finding a precoding matrix from a preceding codebook that maximizes a sum-rate for enabling precoding selections for retransmissions in uplink multiple-input multiple-output MIMO hybrid automatic repeat request HARQ.

Abstract translation: 一种方法包括响应于某一秩的已知预编码矩阵和在原始传输中使用的调制和编码方案分配以及形成近似信道协方差矩阵的期望重传等级来获得用于重传一个码字的预编码器; 响应于先前的形成，针对要重传的每个层激发最小均方误差接收机的信噪比干扰比; 以及从上一个码本中找到一个预编码矩阵，该预编码矩阵使上行链路多输入多输出MIMO混合自动重复请求HARQ中的重传的预编码选择最大化。

公开(公告)号：US08141120B2

公开(公告)日：2012-03-20

申请号：US12348588

申请日：2009-01-05

Applicant: Honghai Zhang ,  Sampath Rangarajan

Inventor： Honghai Zhang ,  Sampath Rangarajan

IPC: H04N7/173

CPC classification number: H04N21/64738 ,  H04N21/23805 ,  H04N21/2402 ,  H04N21/2405 ,  H04N21/6473 ,  H04N21/64769

Abstract: An adaptive scheduling process is disclosed which dynamically decides which frames need to be transmitted and which ones need to be dropped at any transmission opportunity based on current channel conditions and on characteristics of each video frame.

Abstract translation: 公开了一种自适应调度过程，其基于当前信道条件和每个视频帧的特性来动态地决定需要发送哪些帧以及哪些帧在任何传输机会被丢弃。

公开(公告)号：US20120057558A1

公开(公告)日：2012-03-08

申请号：US13296394

申请日：2011-11-15

Applicant: Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

IPC: H04W72/04

CPC classification number: H04W72/04 ,  H04B7/0452 ,  H04B7/0639 ,  H04B7/066 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/20 ,  H04L5/0007 ,  H04L25/0208 ,  H04W8/26 ,  H04W28/04 ,  H04W52/346 ,  H04W72/0446 ,  H04W72/12 ,  H04W72/1231 ,  H04W72/1289

Abstract: Methods and systems for conveying or transmitting to any given user in an OFDMA-MU-MIMO system scheduling information of other co-scheduled users to permit the user to perform error-correction on received data and/or interference reduction on its received signals. The scheduling information can include resource block assignment, modulation constellations employed, coding rates employed, power levels utilized and precoder matrix indices used. Further, the scheduling information can be conveyed in part through dedicated reference symbol layers or pilot streams. Moreover, a base station may transmit a preliminary estimate of the total number of users the base station expects to schedule, or an upper-bound on the total number of users, to the MU-MIMO users to permit the MU-MIMO users to determine preferred precoder matrix indices and indications of channel quality indices.

Abstract translation: 在OFDMA-MU-MIMO系统中向任何给定用户传送或发送给其他协调调度用户的信息的方法和系统，以允许用户对接收到的数据执行纠错和/或对其接收信号的干扰减少。 调度信息可以包括资源块分配，采用的调制星座，采用的编码率，使用的功率电平和使用的预编码器矩阵索引。 此外，可以部分地通过专用参考符号层或导频流来传送调度信息。 此外，基站可以向MU-MIMO用户发送基站期望调度的用户总数或总用户数的上限的初步估计，以允许MU-MIMO用户确定 优选的预编码器矩阵索引和信道质量指标的指示。

公开(公告)号：US08131732B2

公开(公告)日：2012-03-06

申请号：US12331346

申请日：2008-12-09

Applicant: Kai Yu ,  Shenghuo Zhu ,  Yihong Gong

Inventor： Kai Yu ,  Shenghuo Zhu ,  Yihong Gong

IPC: G06F7/00 ,  G06F17/30

CPC classification number: G06F17/30867 ,  G06F17/16

Abstract: A system is disclosed with a collaborative filtering engine to predict an active user's ratings/interests/preferences on a set of new products/items. The predictions are based on an analysis the database containing the historical data of many users' ratings/interests/preferences on a large set of products/items.

Abstract translation: 公开了一种具有协作过滤引擎的系统，以预测一组新产品/项目上的主动用户的评级/兴趣/偏好。 这些预测是基于对包含大量产品/项目的许多用户评级/兴趣/偏好的历史数据的数据库的分析。

公开(公告)号：US20120047415A1

公开(公告)日：2012-02-23

申请号：US13116249

申请日：2011-05-26

Applicant: IVAN B. DJORDJEVIC ,  LEI XU ,  TING WANG

Inventor： IVAN B. DJORDJEVIC ,  LEI XU ,  TING WANG

IPC: H03M13/29 ,  G06F11/10

CPC classification number: H03M13/2963 ,  H03M13/1102 ,  H03M13/1117 ,  H03M13/136 ,  H03M13/152 ,  H03M13/6331 ,  H04L1/005 ,  H04L1/0057

Abstract: Methods and systems for transmitting and receiving data include reverse concatenated encoding and decoding. Reverse concatenated decoding includes inner decoding the encoded stream with an inner decoder that uses a low-complexity linear-block code to produce an inner-decoder output stream, outer decoding the inner-decoder output stream with an outer decoder that uses a low-density parity-check code to produce an information stream, and iterating extrinsic bit reliabilities from the outer decoding for use in subsequent inner decoding to improve decoding performance.

Abstract translation: 发送和接收数据的方法和系统包括反向级联编码和解码。 反向级联解码包括使用内部解码器对编码流进行内部解码，内部解码器使用低复杂度线性块码来产生内部解码器输出流，使用外部解码器对内部解码器输出流进行外部解码，外部解码器使用低密度 奇偶校验码产生信息流，以及从外部解码中迭代外部位可靠性，用于随后的内部解码以提高解码性能。

公开(公告)号：US20120039411A1

公开(公告)日：2012-02-16

申请号：US13115162

申请日：2011-05-25

Applicant: MOHAMMAD A. KHOJASTEPOUR ,  NARAYAN PRASAD ,  SAMPATH RANGARAJAN

Inventor： MOHAMMAD A. KHOJASTEPOUR ,  NARAYAN PRASAD ,  SAMPATH RANGARAJAN

IPC: H04B7/02

CPC classification number: H04B7/0452 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/0665 ,  H04L5/0023 ,  H04L5/0094

Abstract: Systems and methods for conveying wireless transmission allocation information are disclosed. In accordance with one method, an index indicating selected data stream parameters is received. In addition, an indication of a number of transmit antennas at a transmitter from which the data stream is transmitted is also received. Further, the selected parameters are determined from the index based on the number of transmit antennas at the transmitter. Moreover, data signals are received and processed with a processor in accordance with the selected data stream parameters.

Abstract translation: 公开了传送无线传输分配信息的系统和方法。 根据一种方法，接收指示所选数据流参数的索引。 此外，还接收在发送数据流的发送器处的多个发送天线的指示。 此外，基于发射机处的发射天线的数量，从索引确定所选择的参数。 此外，根据所选择的数据流参数，处理器接收并处理数据信号。

公开(公告)号：US20120033756A1

公开(公告)日：2012-02-09

申请号：US13273880

申请日：2011-10-14

Applicant: Mohammad A. Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

Inventor： Mohammad A. Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

IPC: H04L1/02

CPC classification number: H04W72/042 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0626 ,  H04B7/0639 ,  H04L1/0001 ,  H04L1/06

Abstract: Multi-user (MU-) MIMO systems with quantized feedback are designed to maximize the sum-rate via scheduling and linear precoding. To maximize throughput over the network, quantized CSIT is sent through a low-rate feedback link feedback from a plurality of users back to a base station. The base station then determines a subset of the plurality of users to transmit one or more signals to based on the received feedback and determines a preceding matrix based on the received feedback from the plurality of users wherein the precoding matrix maximizes a sum-rate throughput for the subset of the plurality of users. Additionally, based on the received feedback, the base station designs a quantization codebook. This codebook may be designed off-line and/or online. The codebook and/or precoding matrix are used to transmit signals to the users.

Abstract translation: 设计了具有量化反馈的多用户（MU-）MIMO系统，以通过调度和线性预编码来最大化总和速率。 为了使网络上的吞吐量最大化，量化的CSIT通过从多个用户返回到基站的低速率反馈链路反馈发送。 基站然后基于所接收的反馈确定多个用户的子集以发送一个或多个信号，并且基于来自多个用户的接收到的反馈来确定先前的矩阵，其中预编码矩阵使和速率吞吐量最大化 多个用户的子集。 另外，基于接收到的反馈，基站设计量化码本。 该码本可以离线和/或在线设计。 码本和/或预编码矩阵用于向用户发送信号。

公开(公告)号：US20120030716A1

公开(公告)日：2012-02-02

申请号：US13193657

申请日：2011-07-29

Applicant: Honghai Zhang ,  Yuanxi Jiang ,  Sampath Rangarajan

Inventor： Honghai Zhang ,  Yuanxi Jiang ,  Sampath Rangarajan

IPC: H04N7/18

CPC classification number: H04W84/12 ,  H04B7/2662 ,  H04N21/2223 ,  H04N21/234327 ,  H04N21/43615 ,  H04N21/43637 ,  H04W4/06

Abstract: A method includes receiving input information related to transmission of video and data by an access point in a wireless network, the input information including at least one of setup connections, modulating and coding scheme MCS; receiving, by the access point, channel state each information from each user in the wireless network, the channel state information including signal-to-interference-and-noise-ratio SINR for each user under each beam pattern; and multicast beamform scheduling, responsive to the receiving, for multicast delivery of the video and data from the access point with beamforming antennas, the videos being at least one of a multi-resolution and a multi-layered video, the scheduling including a greedy procedure for selecting beams, assigning MCS and video layer or resolution to each of the beams.

Abstract translation: 一种方法包括：通过无线网络中的接入点接收与视频和数据的传输相关的输入信息，所述输入信息包括设置连接，调制和编码方案MCS中的至少一个; 由所述接入点接收来自所述无线网络中每个用户的每个信息的信道状态，所述信道状态信息包括每个用户在每个波束图案下的信噪比和噪声比SINR; 以及组播波束形式调度，响应于所述接收，用波束形成天线从所述接入点多播传送所述视频和数据，所述视频是多分辨率和多层视频中的至少一个，所述调度包括贪婪程序 用于选择波束，为每个波束分配MCS和视频层或分辨率。

公开(公告)号：US20120026932A1

公开(公告)日：2012-02-02

申请号：US13192878

申请日：2011-07-28

Applicant: Karthikeyan Sundaresan ,  Sampath Rangarajan

Inventor： Karthikeyan Sundaresan ,  Sampath Rangarajan

IPC: H04W72/04 ,  H04B7/14

CPC classification number: H04W72/1205 ,  H04B7/2606 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0064 ,  H04W28/06 ,  H04W84/047

Abstract: A method for scheduling transmissions in wireless network includes receiving information ranging from conventional data to real-time streaming applications into a basestation of an OFDMA wireless relay network and scheduling transmission of the information from the basestation by influencing adaptive frame segmentation and access hop reuse in the transmission of the information for achieving higher transmission flow of the information, Where the scheduling is formulated as an integer program, the scheduling includes solving a linear programming relaxation of the integer program and rounding to integral allocations with allocation to at least one of a subset of wireless users and subsets of relays in the network for obtaining frame segmentation and reuse. Where the scheduling is formulated by following a bisection approach to guide adaptation of the frame segmentation, the scheduling determines a subset of users with maximum flow per unit resource for a given frame segmentation and the resulting flow from current and previous scheduling being used to guide adaptation of frame segmentation towards convergence.

Abstract translation: 一种用于在无线网络中调度传输的方法包括从常规数据到实时流应用的接收信息到OFDMA无线中继网络的基站，并且通过影响自适应帧分段和接入跳跃重用来调度来自基站的信息传输 用于实现信息的更高传输流的信息的传输在其中将调度表达为整数程序的情况下，调度包括求解整数程序的线性规划松弛和舍入到整数分配，并将其分配给以下各项中的至少一个： 无线用户和网络中的继电器子集，用于获得帧分割和重用。 在通过遵循用于引导帧分段的适应的二分法来制定调度的情况下，调度确定用于给定帧分段的每单位资源的最大流量的用户的子集，并且来自当前和先前调度的结果流用于指导适应 的帧分割趋向于收敛。

公开(公告)号：US08103312B2

公开(公告)日：2012-01-24

申请号：US13029465

申请日：2011-02-17

Applicant: Mohammad A. Khojastepour

Inventor： Mohammad A. Khojastepour

IPC: H04B1/02

CPC classification number: H04B7/0617 ,  H04B7/04 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0456 ,  H04B7/046 ,  H04B7/0486 ,  H04W52/42 ,  H04W88/02 ,  H04W88/08

Abstract: A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.

Abstract translation: 用于多天线系统的量化多级波束成形方案，例如多输入多输出（MIMO）无线下行链路。 用户设备（UE）估计下行链路信道和发射功率，并确定等级和功率分配。 然后由UE使用连续的波束形成来确定量化的波束形成矩阵。 UE还确定其反馈到无线下行链路基站的信道质量指数（CQI）以及量化波束形成矩阵的索引。 基站使用CQI信息来选择用于下行链路传输的调度的UE和从所选择的UE接收的量化的波束成形矩阵索引来波束形成到UE的下行链路传输。 给定了有限的反馈信道和UE的计算复杂度的限制，基站开销被最小化，同时提供接近最佳的性能。