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51. 发明授权

US08654663B2 MU-MIMO-OFDMA systems and methods for multi-rank CQI computation and precoder selection 有权
标题翻译： MU-MIMO-OFDMA系统和用于多级CQI计算和预编码器选择的方法
公开(公告)号：US08654663B2
公开(公告)日：2014-02-18
申请号：US13080374
申请日：2011-04-05
申请人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
发明人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
IPC分类号： H04L12/28 , H04W4/00 , H04L12/56
CPC分类号： H04W24/08 , H04B7/0452 , H04B7/0465 , H04B7/0486 , H04W52/346 , H04W72/0406 , H04W72/085
摘要： Methods and systems for determining attributes of communication channels of MU-MIMO users in an OFDMA system are disclosed. One method comprises receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band. In addition, the method further comprises determining one or more signal quality measures for the at-least one sub-band based on the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band. Moreover, an indication of the one or more signal quality measures is transmitted to the base station.
摘要翻译：公开了一种用于确定OFDMA系统中MU-MIMO用户的通信信道属性的方法和系统。一种方法包括从基站接收对于连续子载波的至少一个子带，在基站上共同调度的流的总数的估计或上限的指示至少一个子带。另外，该方法还包括基于至少一个子带上基站的调度的流的总数的估计或上限确定至少一个子带的一个或多个信号质量度量一个子带。此外，向基站发送一个或多个信号质量测量的指示。

52. 发明授权

US08625695B2 Feed-forward control signaling and decoding schemes 有权
标题翻译：前馈控制信令和解码方案
公开(公告)号：US08625695B2
公开(公告)日：2014-01-07
申请号：US13115162
申请日：2011-05-25
申请人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
发明人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04B7/0452 , H04B7/0632 , H04B7/0639 , H04B7/0665 , H04L5/0023 , H04L5/0094
摘要： 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.
摘要翻译：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。

53. 发明申请

US20130250868A1 User Pairing and Resource Allocation for Downlink Multiuser Multi-Input-Multi-Output In Long Term Evolution Advanced Systems 有权
标题翻译：用户配对和资源分配下行多用户多输入多输出长期演进高级系统
公开(公告)号：US20130250868A1
公开(公告)日：2013-09-26
申请号：US13622012
申请日：2012-09-18
申请人： Guosen Yue , Narayan Prasad , Sampath Rangarajan
发明人： Guosen Yue , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04W72/06
CPC分类号： H04W72/06 , H04L5/0037 , H04L27/2601
摘要： A method for user pairing and resource allocation, includes performing a multiuser multi-input-multi-output (MU-MIMO) user pairing process to maximize an objective metric without common rank restriction; performing a rank balancing process to determine a uniform transmission user rank along all allocated resource blocks for each user; and with the uniform transmission user rank fixed for all the users, determining optimal user pairing and allocation for each of the resource blocks for each user.
摘要翻译：一种用于用户配对和资源分配的方法，包括执行多用户多输入多输出（MU-MIMO）用户配对过程以最大化不具有共同秩限制的客观量度; 执行秩平衡处理以确定针对每个用户的所有分配的资源块的均匀传输用户等级; 并且针对所有用户固定均匀传输用户等级，为每个用户确定每个资源块的最佳用户配对和分配。

54. 发明授权

US08488441B2 Coordinated linear beamforming in downlink multi-cell wireless networks 有权
公开(公告)号：US08488441B2
公开(公告)日：2013-07-16
申请号：US13414244
申请日：2012-03-07
申请人： Luca Venturino , Xiaodong Wang , Narayan Prasad
发明人： Luca Venturino , Xiaodong Wang , Narayan Prasad
IPC分类号： H04J11/00
CPC分类号： H04W16/28
摘要： System and methods are disclosed for optimizing wireless communication for a plurality of mobile wireless devices. The system uses beamforming vectors or precoders having a structure optimal with respect to the weighted sum rate in a multi-cell orthogonal frequency division multiple access (OFDMA) downlink. A plurality of base stations communicate with the mobile devices and all base stations perform a distributed non-convex optimization exploiting the determined structure.

55. 发明授权

US08472554B2 Signaling of mixture combination sets 有权
标题翻译：混合组合组合信号
公开(公告)号：US08472554B2
公开(公告)日：2013-06-25
申请号：US13088928
申请日：2011-04-18
申请人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
发明人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04L27/00
CPC分类号： H04B7/0452 , H04J11/0046 , H04L5/0023 , H04L25/03331 , H04L27/0008 , H04L27/0012 , H04L27/34 , H04W72/042 , H04W72/12
摘要： Systems and methods for conveying and determining modulations schemes employed by co-scheduled users are disclosed. In addition, methods and systems for designing signaling schemes that convey such information are also disclosed. In accordance with one method, an index is received and a table of indices in which the received index denotes a plurality of different sets of modulation schemes is referenced. Further, one or more modulation schemes of at least one co-scheduled user is determined based on the referencing. In addition, data signals are received and are processed by utilizing the one or more modulation schemes.
摘要翻译：公开了用于传送和确定共同调度用户采用的调制方案的系统和方法。此外，还公开了用于设计传达这种信息的信令方案的方法和系统。根据一种方法，接收索引，并且参考其中接收到的索引表示多个不同的调制方案组的索引表。此外，基于参考来确定至少一个共同调度用户的一个或多个调制方案。此外，接收数据信号并通过利用一个或多个调制方案来处理数据信号。

56. 发明授权

US08432989B2 Max-log stack decoder 有权
标题翻译： Max-log堆栈解码器
公开(公告)号：US08432989B2
公开(公告)日：2013-04-30
申请号：US12549574
申请日：2009-08-28
申请人： Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
发明人： Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04L25/03318 , H04L25/0204 , H04L25/0246 , H04L25/03203 , H04L2025/0342 , H04L2025/03426
摘要： A method for demodulating signals in a multi-input multi-output (MIMO) receiver includes obtaining a transformed vector by a coordinate transformation of a received observation vector using a unitary matrix determined through QR decomposition of an estimated channel matrix; maintaining a list containing nodes along with a cost metric for each node; using the list to generate soft-outputs in the form of log-likelihood ratios (LLRs) for selected symbols of interest, based on the transformed vector and a lower triangular matrix determined through QR decomposition of the estimated channel matrix and the constellations to which the input symbols belong.
摘要翻译：一种用于在多输入多输出（MIMO）接收机中解调信号的方法，包括：使用通过估计的信道矩阵的QR分解确定的酉矩阵，通过接收到的观测向量的坐标变换来获得变换矢量; 维护包含节点的列表以及每个节点的成本度量; 使用该列表基于经变换的矢量以及通过估计的信道矩阵的QR分解确定的下一个三角矩阵和所选择的星座的星座，以所选择的感兴趣的符号的对数似然比（LLR）的形式产生软输出输入符号属于。

57. 发明授权

US08385454B2 Robust linear precoder designs for multi-cell downlink transmission 有权
公开(公告)号：US08385454B2
公开(公告)日：2013-02-26
申请号：US12878258
申请日：2010-09-09
申请人： Ali Tajer , Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
发明人： Ali Tajer , Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
IPC分类号： H04L1/02 , H04B7/02
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.

58. 发明授权

US08335534B2 Distributed inter-cell interference mitigation in OFDMA multi-carrier wireless data networks 有权
标题翻译： OFDMA多载波无线数据网络中的分布式小区间干扰减轻
公开(公告)号：US08335534B2
公开(公告)日：2012-12-18
申请号：US12388428
申请日：2009-02-18
申请人： Hoonghai Zhang , Sampath Rangarajan , Luca Venturino , Narayan Prasad
发明人： Hoonghai Zhang , Sampath Rangarajan , Luca Venturino , Narayan Prasad
IPC分类号： H04B7/00
CPC分类号： H04W52/241 , H04W52/281
摘要： Systems and methods are disclosed for transmission with a plurality of base stations (BSs) in a wireless cellular data network where one BS communicates with neighboring BSs by determining a binary or discrete new power level on each subchannel to determine a weighted sum modified rates of a BS and in-neighbor BSs; and resolving concurrent power update in each BS in a distributed manner.
摘要翻译：公开了用于与无线蜂窝数据网络中的多个基站（BS）进行传输的系统和方法，其中一个BS通过确定每个子信道上的二进制或离散新功率电平来确定每个子信道的加权和修正率 BS和邻居BS; 并以分布式方式解决每个BS中的并发功率更新。

59. 发明申请

US20120275536A1 Codebook With Nested Structure 有权
标题翻译：嵌套结构的代码本
公开(公告)号：US20120275536A1
公开(公告)日：2012-11-01
申请号：US13547617
申请日：2012-07-12
申请人： Mohammad A. Khojastepour , Narayan Prasad
发明人： Mohammad A. Khojastepour , Narayan Prasad
IPC分类号： H04B7/02
CPC分类号： H04B7/0617 , H04B7/0456 , H04B7/0632 , H04B7/0639
摘要： A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.
摘要翻译：相应地确定其中估计下行链路信道并由MRBF发射机使用的最佳预编码矩阵的多级波束成形（MRBF）方案。从具有递归结构的矩阵码本中选择最佳预编码矩阵，其允许有效计算最佳预编码矩阵和对应的信号与干扰和噪声比（SINR）。该码本还具有小的存储空间。由于计算效率和适度的存储器要求，可以在用户设备（UE）进行最佳预编码确定，并通过有限的上行链路信道传送到发射基站，以通过下行链路信道实现。

60. 发明申请

US20120275314A1 Enhancement of Download Multi-User Multiple-Input Multiple-Output Wireless Communications 有权
标题翻译：下载多用户多输入多输出无线通信的增强
公开(公告)号：US20120275314A1
公开(公告)日：2012-11-01
申请号：US13456881
申请日：2012-04-26
申请人： Narayan Prasad , Guosen Yue , Meilong Jiang , Mohammad A. Khojastepour , Sampath Rangarajan
发明人： Narayan Prasad , Guosen Yue , Meilong Jiang , Mohammad A. Khojastepour , Sampath Rangarajan
IPC分类号： H04W24/10
CPC分类号： H04W24/10 , H04B7/0417 , H04B7/0452 , H04B7/0469 , H04B7/0486 , H04B7/0626 , H04B7/063 , H04B7/065
摘要： A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system is disclosed. In an aspect, the user equipment transmits to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule and a second CSI report determined according to an MU-MIMO rule.
摘要翻译：公开了一种在配置成在多用户（MU）多输入多输出（MIMO）无线通信系统中使用的用户设备中实现的方法。一方面，用户设备向基站发送根据单用户（SU）MIMO规则确定的第一信道状态信息（CSI）报告和根据MU-MIMO规则确定的第二CSI报告。

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