专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明申请

US20120281662A1 Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System 有权
标题翻译： OFDMA-MU-MIMO系统中重叠共同调度用户的调度信息
公开(公告)号：US20120281662A1
公开(公告)日：2012-11-08
申请号：US13550099
申请日：2012-07-16
申请人： Narayan Prasad , Mohammad Ali Khojastepour , Meilong Jiang , Xiaodong Wang , Sampath Rangarajan
发明人： Narayan Prasad , Mohammad Ali Khojastepour , Meilong Jiang , Xiaodong Wang , Sampath Rangarajan
IPC分类号： H04W72/08 , H04W72/12
CPC分类号： 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
摘要： A user equipment (UE) used in a multi-user (MU)-multiple input multiple output (MIMO) orthogonal frequency division multiple access (OFDMA) system is disclosed. The UE includes a receiving unit to receive from a base station an indication of an estimate of or an upper-bound on the total number of MU-MIMO user equipments (|S|) that are scheduled on a sub-band by the base station, wherein the sub-band includes one or more resource units, a calculation unit to calculate channel quality based on the indication of the estimate of or the upper-bound on the total number of MU-MIMO user equipments, and a transmission unit to transmit to the base station an indication of the channel quality. Other methods and apparatuses also are disclosed.
摘要翻译：公开了在多用户（MU） - 多输入多输出（MIMO）正交频分多址（OFDMA）系统中使用的用户设备（UE）。 UE包括：接收单元，用于从基站接收由基站在子带上调度的MU-MIMO用户设备（| S |）的总数的估计或上限的指示; 其特征在于，所述子带包括一个以上的资源单元，基于MU-MIMO用户设备的总数的估计或上限的指示来计算信道质量的计算单元，以及发送单元向基站提供信道质量的指示。还公开了其它方法和装置。

32. 发明申请

US20120057558A1 Method and Systems for Conveying Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System 有权
标题翻译：用于在OFDMA-MU-MIMO系统中传送重叠共同调度用户的调度信息的方法和系统
公开(公告)号：US20120057558A1
公开(公告)日：2012-03-08
申请号：US13296394
申请日：2011-11-15
申请人： Narayan Prasad , Mohammad Ali Khojastepour , Meilong Jiang , Xiaodong Wang , Sampath Rangarajan
发明人： Narayan Prasad , Mohammad Ali Khojastepour , Meilong Jiang , Xiaodong Wang , Sampath Rangarajan
IPC分类号： H04W72/04
CPC分类号： 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
摘要： 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.
摘要翻译：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。

33. 发明申请

US20120033756A1 Multi-User Downlink Linear MIMO Precoding System 有权
标题翻译：多用户下行线性MIMO预编码系统
公开(公告)号：US20120033756A1
公开(公告)日：2012-02-09
申请号：US13273880
申请日：2011-10-14
申请人： Mohammad A. Khojastepour , Xiaodong Wang , Mohammad Madihian
发明人： Mohammad A. Khojastepour , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04L1/02
CPC分类号： H04W72/042 , H04B7/0417 , H04B7/0452 , H04B7/0465 , H04B7/0626 , H04B7/0639 , H04L1/0001 , H04L1/06
摘要： 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.
摘要翻译：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。

34. 发明授权

US08098631B2 Group MMSE-DFD with rate (SINR) feedback and without pre-determined decoding order for reception on a cellular downlink 有权
标题翻译：具有速率（SINR）反馈的组MMSE-DFD，并且没有用于蜂窝下行链路上的接收的预定解码顺序
公开(公告)号：US08098631B2
公开(公告)日：2012-01-17
申请号：US12047555
申请日：2008-03-13
申请人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
发明人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04W4/00
CPC分类号： H04W88/06 , H04W4/06 , H04W24/00 , H04W84/042
摘要： The invention is a method directed to group MMSE-DFD with rate (SINR) feedback and without pre-determined decoding order for reception on a cellular downlink. The method includes initializing channel matrix estimates and inner codes of all co-channel transmitter sources in a wireless network. Each channel matrix estimate is converted into an effective channel matrix responsive to the inner code of the corresponding transmitter source; The channel estimates or the inner codes or the modulation and coding schemes are not known for some of the transmitter sources whose transmitted signals are consequently treated as interference and deemed un-decodable.
摘要翻译：本发明是一种针对具有速率（SINR）反馈的组MMSE-DFD并且在蜂窝下行链路上没有用于接收的预定解码顺序的方法。该方法包括在无线网络中初始化信道矩阵估计和所有同信道发射机源的内部码。响应于相应的发射机源的内部码，每个信道矩阵估计被转换成有效的信道矩阵; 信道估计或内码或调制和编码方案对于其发射信号因此被视为干扰并被认为是不可解码的一些发射机源是未知的。

35. 发明申请

US20110246848A1 LT DECODING AND RETRANSMISSION FOR WIRELESS BROADCAST 有权
标题翻译： LT无线广播解码和恢复
公开(公告)号：US20110246848A1
公开(公告)日：2011-10-06
申请号：US13023667
申请日：2011-02-09
申请人： Guosen Yue , Momin A. Uppal , Xiaodong Wang
发明人： Guosen Yue , Momin A. Uppal , Xiaodong Wang
IPC分类号： H04L1/08 , H03M13/05 , G06F11/10 , G06F11/14
CPC分类号： H04L1/0045 , H03M13/3723 , H03M13/3761 , H03M13/6306 , H04L1/1819
摘要： Methods and systems for doped rateless retransmission include receiving ratelessly coded symbols. An attempt is made to decode the coded symbols using a processor by creating an associated code graph that represents the structure of the rateless code used by the symbols. If the decoding attempt fails, an input node is selected from the code graph using a metric that gauges the number and degree of connections to the input node based on the code graph structure. The selected input node is then requested for retransmission of the selected input node by a feedback channel.
摘要翻译：用于掺杂无错重传的方法和系统包括接收无编码符号。尝试使用处理器来解码编码符号，通过创建代表由符号使用的无码代码的结构的相关联的代码图。如果解码尝试失败，则使用使用基于代码图结构来衡量与输入节点的连接的数量和程度的度量从代码图中选择输入节点。然后通过反馈信道请求所选择的输入节点来重传所选择的输入节点。

36. 发明授权

US08023581B2 Max-log receiver for multiple-input multiple-output (MIMO) systems 有权
标题翻译：用于多输入多输出（MIMO）系统的最大对数接收机
公开(公告)号：US08023581B2
公开(公告)日：2011-09-20
申请号：US11857269
申请日：2007-09-18
申请人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
发明人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04L23/02 , H04L27/06
CPC分类号： H04L1/0054 , H04L25/03203 , H04L25/03286 , H04L25/03305
摘要： A method includes the steps of i) listing out all possibilities for a first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each of the first symbol listed out, iii) evaluating a metric for each of the first symbol and second symbol pair, iv) listing out all possibilities for second symbol, v) determining a first symbol for each choice of the second symbol listed out, vi) evaluating a metric for each of the second symbol and first symbol pair, vii) determining an exact maximum log likelihood ratio for all bits using the metrics, and viii) decoding codeword(s) in the two stream signal using the determined exact maximum log likelihood ratio for all bits.
摘要翻译：一种方法包括以下步骤：i）列出两个流信号的第一符号的所有可能性; ii）确定所列出的第一符号中的每一个的两个流信号的第二符号，iii）评估第一符号和第二符号对中的每一个的度量，iv）列出第二符号的所有可能性，v）确定 vi）对所述第二符号和第一符号对中的每个符号对的每一个的度量进行评估，vii）使用所述度量确定所有比特的精确最大对数似然比，以及viii）解码码字（ s）在两个流信号中，使用所确定的所有比特的精确最大对数似然比。

37. 发明授权

US07960594B2 Method of preparing ethylene glycol from cellulose 有权
标题翻译：从纤维素制备乙二醇的方法
公开(公告)号：US07960594B2
公开(公告)日：2011-06-14
申请号：US12734601
申请日：2008-10-31
申请人： Tao Zhang , Mingyuan Zheng , Na Ji , Aigin Wang , Yuying Shu , Hui Wang , Xiaodong Wang , Jingguang Chen
发明人： Tao Zhang , Mingyuan Zheng , Na Ji , Aigin Wang , Yuying Shu , Hui Wang , Xiaodong Wang , Jingguang Chen
IPC分类号： C07C29/00
CPC分类号： C07C29/00 , B01J21/063 , B01J21/18 , B01J23/652 , B01J23/6527 , B01J23/85 , B01J23/888 , B01J27/19 , B01J27/22 , B01J27/25 , Y02P20/52 , C07C31/202
摘要： A method for preparing ethylene glycol from cellulose uses the cellulose as the feed for the reaction. The cellulose conversion is performed over catalysts which are composed of the metallic state, carbides, nitrides, or phosiphides of molybdenum or tungsten, and metallic cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum of the group 8, 9, or 10 transition metals. The catalytic conversion of cellulose is conducted at 120 to 300° C. and hydrogen pressure 1 to 12 MPa under the hydrothermal conditions to achieve the high efficiency, high selectivity, and high yield of ethylene glycol. Compared to the existing method of preparing ethylene glycol from ethylene, the method, using the renewable raw material for the reaction, is friendly to the environment, and has high atom economy.
摘要翻译：从纤维素制备乙二醇的方法使用纤维素作为反应的进料。纤维素转化在由金属状态，碳化物，氮化物或钼或钨的高温以及金属钴，镍，钌，铑，钯，铱和铂组成的催化剂上进行，第8,9或9族 10个过渡金属。在水热条件下，纤维素的催化转化率为120〜300℃，氢压为1〜12MPa，达到乙二醇的高效率，高选择性和高产率。与从乙烯制备乙二醇的现有方法相比，使用可再生原料进行反应的方法对环境友好，原子经济性好。

38. 发明授权

US07929478B2 Optimal resource allocation in a multi-hop OFDMA wireless network with cooperative relaying 有权
标题翻译：具有协同中继的多跳OFDMA无线网络中的最优资源分配
公开(公告)号：US07929478B2
公开(公告)日：2011-04-19
申请号：US11953105
申请日：2007-12-10
申请人： Seung-Jun Kim , Xiaodong Wang , Mohammad Madihian
发明人： Seung-Jun Kim , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04B7/14
CPC分类号： H04L5/0058 , H04B7/0617 , H04L5/0023 , H04L5/0037 , H04W28/16 , H04W52/46 , H04W88/04
摘要： An optimal resource allocation strategy for OFDMA multi-hop wireless networks is disclosed. The system allocates one or more resources in a multi-hop network by solving one or more higher-layer sub-problem; solving one or more physical layer and media access control (PHY/MAC) layer sub-problems per tone per time slot with one of cooperative relaying of radio signals or spatial reusing of radio spectrum; updating prices; and allocating radio resources based on the PHY/MAC layer sub-problems.
摘要翻译：公开了OFDMA多跳无线网络的最优资源分配策略。系统通过解决一个或多个更高层次的问题，在多跳网络中分配一个或多个资源; 通过无线电信号的协同中继或无线电频谱的空间重用来解决每时隙每个音调的一个或多个物理层和媒体访问控制（PHY / MAC）层子问题; 更新价格; 以及基于PHY / MAC层子问题分配无线电资源。

39. 发明申请

US20110069774A1 Methods and Systems for Providing Feedback for Beamforming and Power Control 有权
标题翻译：提供波束形成和功率控制反馈的方法和系统
公开(公告)号：US20110069774A1
公开(公告)日：2011-03-24
申请号：US12665684
申请日：2008-06-19
申请人： Xiaodong Wang , Filippo Zuccardi Merli
发明人： Xiaodong Wang , Filippo Zuccardi Merli
IPC分类号： H04B7/02
CPC分类号： H04W52/248 , H04B7/0417 , H04B7/0634 , H04L1/0025 , H04L5/0023 , H04L5/006 , H04L25/022 , H04L25/0224 , H04L25/0242 , H04L27/2624 , H04W52/247 , H04W52/42
摘要： Methods and systems for providing feedback for beamforming and power control are provided. In some embodiments, the methods comprise: calculating a threshold associated with a subcarrier; receiving the subcarrier containing an information symbol at the receiver; determining a channel estimate of the subcarrier and a weighting vector for the information symbol; based at least on the channel estimate and the weighting vector, determining a power level of the subcarrier; comparing the power level to the threshold; generating a feedback signal indicating a first energy level to be used for the subcarrier based on the comparison; subsequent to generating the feedback signal, determining a second power level of the subcarrier; comparing the second power level to the threshold; and generating a second feedback signal to the transmitter indicating a second energy level to be used for the subcarrier.
摘要翻译：提供了用于提供波束形成和功率控制的反馈的方法和系统。在一些实施例中，所述方法包括：计算与子载波相关联的阈值; 在接收机处接收包含信息符号的子载波; 确定所述子载波的信道估计和所述信息符号的加权向量; 至少基于信道估计和加权矢量，确定子载波的功率电平; 将功率电平与阈值进行比较; 基于所述比较，生成指示要用于所述子载波的第一能级的反馈信号; 在产生所述反馈信号之后，确定所述子载波的第二功率电平; 将第二功率电平与阈值进行比较; 以及向所述发射机生成指示要用于所述副载波的第二能级的第二反馈信号。

40. 发明申请

US20110059705A1 ROBUST LINEAR PRECODER DESIGNS FOR MULTI-CELL DOWNLINK TRANSMISSION 有权
标题翻译：用于多小时下行链路传输的鲁棒线性预处理器设计
公开(公告)号：US20110059705A1
公开(公告)日：2011-03-10
申请号：US12878258
申请日：2010-09-09
申请人： Ali Tajer , Narayan Prasad , Xiaodong Wang , Sampath Rangrajan
发明人： Ali Tajer , Narayan Prasad , Xiaodong Wang , Sampath Rangrajan
IPC分类号： H04B1/04
CPC分类号： H04B7/0626 , H04B7/022
摘要： Methods and systems for optimizing the utilities of receiver devices in a wireless communication network are disclosed. Precoder design formulations that maximize a minimum worst-case rate or a worst-case sum rate are described for both full base station cooperation and limited base station cooperation scenarios. In addition, optimal equalizers are also selected to optimize the worst-case sum rate.
摘要翻译：公开了用于优化无线通信网络中的接收机设备的实用性的方法和系统。对于完整的基站合作和有限的基站合作情况，都会描述使最小最坏情况速率或最差情况下的总速率最大化的预编码器设计公式。此外，还选择最佳均衡器来优化最差情况下的和速率。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式