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71. 发明申请

US20120170676A1 Robust Linear Precoder Designs for Multi-Cell Downlink Transmission 有权
标题翻译：用于多单元下行链路传输的鲁棒线性预测器设计
公开(公告)号：US20120170676A1
公开(公告)日：2012-07-05
申请号：US13414110
申请日：2012-03-07
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： 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.
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，都会描述最大化最小最坏情况速率或最差情况下的总速率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。

72. 发明申请

US20110305299A1 WIDEBAND CODEBOOK CONSTRUCTION AND APPLICATIONS 有权
标题翻译：宽带代码构造和应用
公开(公告)号：US20110305299A1
公开(公告)日：2011-12-15
申请号：US13213510
申请日：2011-08-19
申请人： Narayan Prasad , Mohammad Amir Khojastepour , Sampath Rangarajan
发明人： Narayan Prasad , Mohammad Amir Khojastepour , Sampath Rangarajan
IPC分类号： H04L25/49
CPC分类号： H04B7/0417 , H04B7/0469 , H04B7/0486 , H04B7/0632 , H04B7/0639 , H04B7/0669
摘要： A precoding scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the multi antenna transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices that includes matrices having a structure matched to that of the eigenvectors of the spatial covariance matrix, wherein the spatial covariance matrix is modeled as a Hermitian and Toeplitz matrix parameterized by a single complex-valued scalar.
摘要翻译：相应地确定其中估计下行链路信道并由多天线发射机使用的最佳预编码矩阵的预编码方案。从包括具有与空间协方差矩阵的特征向量的结构匹配的矩阵的矩阵的码本中选择最佳预编码矩阵，其中空间协方差矩阵被建模为由单个复值标量参数化的Hermitian和Toeplitz矩阵。

73. 发明授权

US08576959B2 Receiver with prefiltering for discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) based systems 有权
标题翻译：具有用于离散傅里叶变换扩展正交频分复用（DFT-S-OFDM）的系统的预滤波的接收机
公开(公告)号：US08576959B2
公开(公告)日：2013-11-05
申请号：US12425080
申请日：2009-04-16
申请人： Narayan Prasad , Xiaodong Wang , Shuangquan Wang
发明人： Narayan Prasad , Xiaodong Wang , Shuangquan Wang
IPC分类号： H04L27/06
CPC分类号： H04L27/2647 , H04L25/03159 , H04L25/067
摘要： A receiver for discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) based systems, including a prefilter for received signal codeword(s); and a log-likelihood ratio LLR module responsive to the prefilter; wherein the prefilter includes a pairing and whitening module that based on channel estimates and data rate enables the LLR module to perform either a Serial-In-Serial-Out (SISO) based log likelihood ratio processing of an output from the paring and whitening module or a two-symbol max-log soft output demodulator (MLSD) based log likelihood ratio processing of an output from the pairing and whitening module.
摘要翻译：一种用于离散傅里叶变换扩展正交频分复用（DFT-S-OFDM）系统的接收机，包括用于接收信号码字的预滤波器; 以及响应于所述预过滤器的对数似然比LLR模块; 其中所述预过滤器包括配对和增白模块，其基于信道估计和数据速率使得所述LLR模块能够执行基于串行输出（SISO）的对数似然比处理来自所述配对和增白模块的输出，来自配对和增白模块的输出的基于双符号最大对数软输出解调器（MLSD）的对数似然比处理。

74. 发明授权

US08488440B2 Coordinated linear beamforming in downlink multi-cell wireless networks 有权
标题翻译：下行链路多小区无线网络中的协调线性波束成形
公开(公告)号：US08488440B2
公开(公告)日：2013-07-16
申请号：US13414202
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.
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。

75. 发明授权

US08385364B2 Distributed message-passing based resource allocation in wireless systems 有权
标题翻译：无线系统中基于分布式消息传递的资源分配
公开(公告)号：US08385364B2
公开(公告)日：2013-02-26
申请号：US12549546
申请日：2009-08-28
申请人： Kai Yang , Xiaodong Wang , Narayan Prasad
发明人： Kai Yang , Xiaodong Wang , Narayan Prasad
IPC分类号： H04J3/16
CPC分类号： H04W72/0453 , H04L5/0007 , H04L5/0039 , H04L5/0044 , H04L5/0071 , H04L5/0076
摘要： Systems and methods are disclosed to allocate resources in discrete Fourier transform spread orthogonal frequency division multiple access (DFT-S-OFDMA) networks, which involve determining a reward for each user when assigned a frequency chunk (FC) of subcarriers, where each FC is a set of contiguous subcarriers; splitting each user into one or more sub-users, with each sub-user having identical rewards; and assigning resources with a message-passing based FC allocation.
摘要翻译：公开了系统和方法来分配离散傅立叶变换扩展正交频分多址（DFT-S-OFDMA）网络中的资源，这些网络涉及当分配子载波的频率块（FC）时确定每个用户的奖励，其中每个FC 一组连续的副载波; 将每个用户分成一个或多个子用户，每个子用户具有相同的奖励; 并使用基于消息传递的FC分配来分配资源。

76. 发明授权

US08346193B2 Codebook with nested structure 有权
公开(公告)号：US08346193B2
公开(公告)日：2013-01-01
申请号：US13547617
申请日：2012-07-12
申请人： Mohammad Ali Khojastepour , Narayan Prasad
发明人： Mohammad Ali 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.

77. 发明申请

US20120263467A1 Polmux-OFDM-DD Transmitter and Receiver for Reduced Complexity and Overhead in Optical Access/Metro Transmission 有权
标题翻译： Polmux-OFDM-DD发射机和接收机，用于降低光接入/城域传输中的复杂性和开销
公开(公告)号：US20120263467A1
公开(公告)日：2012-10-18
申请号：US13446306
申请日：2012-04-13
申请人： Neda Cvijetic , Yue-Kai Huang , Narayan Prasad , Ting Wang
发明人： Neda Cvijetic , Yue-Kai Huang , Narayan Prasad , Ting Wang
IPC分类号： H04J14/06
CPC分类号： H04J14/06 , H04B10/532 , H04B10/548 , H04J14/02 , H04L5/0023 , H04L25/0204 , H04L27/2096 , H04L27/223 , H04L27/2697 , H04L2025/03414 , H04L2025/03426
摘要： An optical communication system includes a polarization multiplexed orthogonal frequency-division multiplexing POLMUX-OFDM transmitter for generating a POLMUX-OFDM double sideband signal, an optical processing path for processing the double sideband signal from the transmitter; an analog-to-digital convert ADC-OFDM receiver coupled to the optical processing path for receiving the double sideband signal processed by the optical path; and a block-diagonal multiple-input multiple-output MIMO equalizer responsive to the receiver for enabling correct operation for a completely random incoming signal polarization state without adaptive polarization control at said receiver, which enables complexity.
摘要翻译：光通信系统包括用于产生POLMUX-OFDM双边带信号的偏振复用正交频分复用POLMUX-OFDM发射机，用于处理来自发射机的双边带信号的光处理路径; 耦合到光学处理路径的用于接收由光路处理的双边带信号的模数转换ADC-OFDM接收器; 以及响应于接收机的块对角多输入多输出MIMO均衡器，用于使能在所述接收机处没有自适应偏振控制的完全随机输入信号偏振状态的正确操作，这使得复杂性。

78. 发明授权

US08091006B2 Spherical lattice codes for lattice and lattice-reduction-aided decoders 有权
标题翻译：用于晶格和晶格减少辅助解码器的球形晶格码
公开(公告)号：US08091006B2
公开(公告)日：2012-01-03
申请号：US11694241
申请日：2007-03-30
申请人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
发明人： Narayan Prasad , Xiaodong Wang , Mohammad Madihian
IPC分类号： H03M13/00
CPC分类号： H03M13/01 , H04L1/0631 , H04L1/0637
摘要： Methods and apparatus for designing spherical lattice codebooks for use in data transmission systems are provided. A spherical lattice codebook is constructed by determining the channel statistics of one or more channels, which can be accomplished by observing a sufficiently large set of channel realizations. After determining the channel statistics, an expression for the error probability of the decoder or expressions for bounds on the error probability and expressions for the corresponding gradients are determined. The gradient is then used in an optimization technique to produce a spherical lattice codebook which is subsequently used for transmission.
摘要翻译：提供了用于数据传输系统中使用的球面晶格码本的方法和装置。通过确定一个或多个信道的信道统计量来构造球面晶格码本，其可以通过观察足够大的信道实现集来实现。在确定信道统计后，确定解码器的错误概率或对于对应梯度的误差概率和表达式的边界的表达式的表达式。然后将梯度用于优化技术中以产生随后用于传输的球形晶格码本。

79. 发明授权

US08036601B2 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组合LMMSE解调，用于在蜂窝下行链路上接收
公开(公告)号：US08036601B2
公开(公告)日：2011-10-11
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。

80. 发明授权

US08031798B2 Group MMSE-DFD with rate (SINR) feedback and 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和用于在蜂窝下行链路上接收的预定解码顺序
公开(公告)号：US08031798B2
公开(公告)日：2011-10-04
申请号：US12047544
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： H04B15/00
CPC分类号： H04W72/082 , H04B7/0854 , H04B17/24 , H04B17/336 , H04L1/0026 , H04L1/0631 , H04L1/0668 , H04L25/03057 , H04L2025/03414 , H04L2025/0349 , H04W4/06 , H04W24/00 , H04W84/042
摘要： A method for decoding and rate assignment in a wireless channel, where all dominant transmitter sources use inner codes from a particular set, comprising the steps of: i) estimating channel matrices seen from all dominant transmitter sources in response to a pilot or preamble signal transmitted by each such source; ii) converting each estimated channel matrix into an effective channel matrix responsive to the inner code of the corresponding transmitter source; iii) obtaining the received observations in a linear equivalent form (linear model) whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitter source inherits the structure of its inner code; iv) processing the transmitter sources according to the specified (or pre-determined) order of decoding; v) for each transmitter source, assuming perfect cancellation of signals of preceding transmitter sources; vi) computing a signal-to-interference-noise-ratio SINR responsive to the effective channel matrix of the transmitter source and the covariance matrix of the noise plus signals from remaining transmitter sources; and vii) feeding back all computed SINRs to respective transmitter sources.
摘要翻译：一种用于在无线信道中解码和速率分配的方法，其中所有主要发射机源使用来自特定集合的内部码，包括以下步骤：i）响应于传输的导频或前导信号估计从所有主要发射机源看到的信道矩阵由每个这样的来源; ii）响应于对应的发射机源的内部码，将每个估计的信道矩阵转换成有效信道矩阵; iii）以线性等效形式（线性模型）获得接收到的观测值，其输出等于所接收的观测值，并且其中对应于每个主要发射机源的有效信道矩阵继承其内部码的结构; iv）根据指定（或预定）解码顺序处理发射机源; v）对于每个发射机源，假设完全取消先前发射机的信号; vi）响应于发射机源的有效信道矩阵和来自剩余发射机源的噪声加信号的协方差矩阵来计算信噪比SINR; 和vii）将所有计算的SINR反馈到相应的发射机源。

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