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61. 发明授权

US08285232B2 Codebook with nested structure 有权
标题翻译：嵌套结构的代码本
公开(公告)号：US08285232B2
公开(公告)日：2012-10-09
申请号：US13111594
申请日：2011-05-19
申请人： Mohammad A. Khojastepour , Narayan Prasad
发明人： Mohammad A. Khojastepour , Narayan Prasad
IPC分类号： H04B1/04
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。

62. 发明授权

US08238854B2 Feedback generator for codebook with nested structure 有权
标题翻译：用于嵌套结构的码本的反馈生成器
公开(公告)号：US08238854B2
公开(公告)日：2012-08-07
申请号：US13111641
申请日：2011-05-19
申请人： Mohammad A. Khojastepour , Narayan Prasad
发明人： Mohammad A. Khojastepour , Narayan Prasad
IPC分类号： H04B1/04
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。

63. 发明申请

US20120170677A1 COORDINATED LINEAR BEAMFORMING IN DOWNLINK MULTI-CELL WIRELESS NETWORKS 有权
标题翻译：协调线性波束在下行多个无线网络中的应用
公开(公告)号：US20120170677A1
公开(公告)日：2012-07-05
申请号：US13414244
申请日：2012-03-07
申请人： Luca Venturino , Narayan Prasad , Xiaodong Wang
发明人： Luca Venturino , Narayan Prasad , Xiaodong Wang
IPC分类号： H04B15/00 , H04B7/02
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.
摘要翻译：公开了用于优化多个移动无线设备的无线通信的系统和方法。该系统在多小区正交频分多址（OFDMA）下行链路中使用具有关于加权和速率最优的结构的波束成形向量或预编码器。多个基站与移动设备进行通信，并且所有基站使用所确定的结构来执行分布式非凸优化。

64. 发明申请

US20120170530A1 METHOD FOR LTE DOWNLINK SCHEDULING WITH MIMO 有权
标题翻译：用于具有MIMO的LTE下行链路调度的方法
公开(公告)号：US20120170530A1
公开(公告)日：2012-07-05
申请号：US13343192
申请日：2012-01-04
申请人： Honghai Zhang , Narayan Prasad , Sampath Rangarajan
发明人： Honghai Zhang , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04W72/04
CPC分类号： H04W72/0406 , H04B7/0417 , H04B7/0452 , H04B7/0465 , H04B7/0626 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/06 , H04L5/0023 , H04L5/0037 , H04L5/0046 , H04W72/04 , H04W72/042 , H04W72/1231
摘要： A method for LTE or WiMAX scheduling includes collecting, by a basestation BS, channel feedback from multiple mobiles with downlink traffic. The channel feedback enables the BS to determine an achievable rate or block error probability if transmitting to a mobile with a given modulation and coding scheme MCS and multiple-input multiple-output MIMO mode. The method includes determining, by the BS, which of the mobiles is scheduled on each resource block RB and what the MCS and MIMO mode is selected for each scheduled mobile, and allocating bits on the set of the RBs assigned to each scheduled mobile.
摘要翻译：用于LTE或WiMAX调度的方法包括由基站BS从具有下行链路业务的多个移动台收集信道反馈。如果使用给定的调制和编码方案MCS和多输入多输出MIMO模式发送到移动台，则信道反馈使得BS能够确定可实现的速率或块错误概率。该方法包括由BS确定在每个资源块RB上调度哪些移动台，以及为每个调度的移动台选择哪种MCS和MIMO模式，以及分配给每个调度的移动站的RB集合上的比特。

65. 发明申请

US20120069928A1 ROBUST PRECODER AND RECEIVER FILTER DESIGN FOR GAUSSIAN INTERFERENCE CHANNEL 有权
标题翻译：高斯干扰通道的稳定的预编码器和接收器滤波器设计
公开(公告)号：US20120069928A1
公开(公告)日：2012-03-22
申请号：US13234945
申请日：2011-09-16
申请人： Jubin Jose , Narayan Prasad , Mohammad A. Khojastepour , Sampath Rangarajan
发明人： Jubin Jose , Narayan Prasad , Mohammad A. Khojastepour , Sampath Rangarajan
IPC分类号： H04L25/03 , H04B15/00
CPC分类号： H04L25/03343 , H04B7/0456 , H04B7/0465 , H04L2025/03426 , H04L2025/03611
摘要： A system and method for providing at least one transmit precoder includes transforming at least one of a weighted sum-rate and max-min rate objective into two or more sub-problems by introducing at least one slack variable. The two or more sub-problems are iterated on a computer readable storage medium to provide at least one transmit precoder for each transmitter.
摘要翻译：用于提供至少一个发送预编码器的系统和方法包括通过引入至少一个松弛变量将加权和速率和最大速率目标中的至少一个变换成两个或更多个子问题。在计算机可读存储介质上重复两个或更多个子问题，以为每个发射器提供至少一个发射预编码器。

66. 发明申请

US20120057557A1 Method and Systems for Conveying Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System 有权
公开(公告)号：US20120057557A1
公开(公告)日：2012-03-08
申请号：US13296387
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： H04W74/02
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.

67. 发明授权

US08068407B2 Group MMSE-DFD with order and filter computation for reception on a cellular downlink 有权
标题翻译：用于在蜂窝下行链路上接收的具有顺序和滤波器计算的组MMSE-DFD
公开(公告)号：US08068407B2
公开(公告)日：2011-11-29
申请号：US12047527
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： H04J11/00
CPC分类号： H04L1/208 , H04B1/7105 , H04B1/71055 , H04B1/7107 , H04B2201/70702 , H04L1/0045 , H04L1/0606 , H04L1/0656 , H04L1/0668
摘要： The present method resides in a user destination receiver to exploit the structure of the transmitted signals to design filters that yield improved performance. Moreover, the computational cost of designing these filters can be reduced and the demodulation complexity can be kept low. Further, the present method enables determining the order of decoding the transmitter sources. The present method provides group MMSE decision feedback decoding for the case when all the sources transmit at fixed pre-determined rates and the MCS employed by each source is known to the destination. The present method includes a filtering technique and an order and filter computation process, both improvements over previous efforts at group MMSE decision feedback decoding.
摘要翻译：本方法驻留在用户目的地接收机中，以利用所发送信号的结构来设计产生改善的性能的滤波器。此外，可以减少设计这些滤波器的计算成本，并且可以将解调复杂度保持为低。此外，本方法能够确定解码发射机源的顺序。本方法为所有源以固定预定速率发送的情况提供组MMSE判决反馈解码，并且目的地已知每个源使用的MCS。本方法包括过滤技术和顺序和过滤器计算过程，与以前在组MMSE决策反馈解码方面的改进相比。

68. 发明申请

US20110274208A1 Feedback Generator For Codebook With Nested Structure 有权
标题翻译：嵌套结构码本的反馈生成器
公开(公告)号：US20110274208A1
公开(公告)日：2011-11-10
申请号：US13111641
申请日：2011-05-19
申请人： Mohammad A. Khojastepour , Narayan Prasad
发明人： Mohammad A. Khojastepour , Narayan Prasad
IPC分类号： H04L25/49
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。

69. 发明授权

US07787553B2 Group decoder with improved partitioning for multiple antenna multiuser channel 有权
标题翻译：用于多天线多用户信道的分组解码器
公开(公告)号：US07787553B2
公开(公告)日：2010-08-31
申请号：US11428386
申请日：2006-07-01
申请人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
发明人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04B7/02
CPC分类号： H04L25/03006 , H04L2025/03426
摘要： A group detection arrangement for a multiple antenna receiver structure usable with a multiuser multiple access communication channel with fading is herein disclosed. The group detection arrangement uses an optimized channel dependent group partitioning technique.
摘要翻译：本文公开了一种可用于具有衰落的多用户多址通信信道的多天线接收机结构的组检测装置。组检测装置使用优化的信道相关组分割技术。

70. 发明申请

US20080227397A1 Group LMMSE Demodulation Using Noise and Interference Covariance Matrix for Reception on a Cellular Downlink 有权
标题翻译：使用噪声和干扰协方差矩阵对在蜂窝下行链路上接收的LMMSE解组
公开(公告)号：US20080227397A1
公开(公告)日：2008-09-18
申请号：US12047514
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： H04B1/00 , H04B15/00
CPC分类号： H04B1/71055
摘要： A method for filtering in a wireless downlink channel, where all dominant transmitting sources use inner codes from a particular set, includes the steps of estimating a channel matrix seen from a desired transmitter source in response to a pilot or preamble signal; converting the estimated channel matrix into an effective channel matrix responsive to the inner code of the desired transmitting source; estimating a covariance matrix of noise plus interference in a linear model whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitting source inherits the structure of its inner code; computing a signal-to-noise-interference-ratio SINR responsive to the covariance matrix and the effective channel matrix corresponding to the desired source; and feeding back the computed SINR to the transmitter source.
摘要翻译：一种在无线下行链路信道中进行滤波的方法，其中所有主要发射源使用来自特定集合的内部码包括以下步骤：响应于导频或前导信号估计从期望的发射机源看到的信道矩阵; 响应于期望的发送源的内部码，将估计的信道矩阵转换成有效信道矩阵; 在线性模型中估计噪声加干扰的协方差矩阵，其输出等于接收到的观测值，并且其中对应于每个主导发射源的有效信道矩阵继承其内部码的结构; 响应于协方差矩阵和对应于期望源的有效信道矩阵来计算信噪比干扰比SINR; 并将所计算的SINR反馈到发射机源。

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