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21. 发明授权

US08605770B2 Ultra wideband modulation for body area networks 有权
公开(公告)号：US08605770B2
公开(公告)日：2013-12-10
申请号：US12702628
申请日：2010-02-09
申请人： June Chul Roh , Anuj Batra , Sudipto Chakraborty , Srinath Hosur
发明人： June Chul Roh , Anuj Batra , Sudipto Chakraborty , Srinath Hosur
IPC分类号： H04B1/00
CPC分类号： H04B1/69 , H04B1/7176 , H04B2001/6908
摘要： A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval.

22. 发明授权

US08488655B2 PHY layer parameters for body area network (BAN) devices 有权
公开(公告)号：US08488655B2
公开(公告)日：2013-07-16
申请号：US12760516
申请日：2010-04-14
申请人： Anuj Batra , Timothy M. Schmidl , Srinath Hosur , June Chul Roh
发明人： Anuj Batra , Timothy M. Schmidl , Srinath Hosur , June Chul Roh
IPC分类号： H04B1/40
CPC分类号： H04W4/80 , H04L27/18 , H04L27/20 , H04L27/2675 , H04L69/22 , H04W52/36 , H04W52/367 , H04W72/0453 , H04W74/0816
摘要： In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to transmit and receive data in a frequency band selected from the group consisting of: 402-405 MHz, 420-450 MHz, 863-870 MHz, 902-928 MHz, 950-956 MHz, 2360-2400 MHz, and 2400-2483.5 MHz.

23. 发明申请

US20130170587A1 Systems and Methods for N-Dimensional Leaf-Node Prediction for MIMO Detection 审中-公开
标题翻译：用于MIMO检测的N维叶节点预测的系统和方法
公开(公告)号：US20130170587A1
公开(公告)日：2013-07-04
申请号：US13525283
申请日：2012-06-16
申请人： Deric Waters , Anuj Batra , Srinath Hosur
发明人： Deric Waters , Anuj Batra , Srinath Hosur
IPC分类号： H04B7/04
CPC分类号： H04B7/0413 , H04L25/0204 , H04L25/0242 , H04L25/0246
摘要： Systems comprising a leaf node predictor for receiving a processed communications stream, determining at least one channel metric corresponding to the communications stream for a given channel realization, and generating at least three instructions to output, which at least one instruction corresponds to at least one predicted best leaf node candidate for the given channel realization.
摘要翻译：包括用于接收经处理的通信流的叶节点预测器的系统，确定与给定信道实现相关的通信流的至少一个信道度量，以及生成至少三个指令以输出，至少一个指令对应于至少一个预测的给定通道实现的最佳叶节点候选。

24. 发明授权

US08243843B2 Systems and methods for low-complexity MIMO detection using leaf-node prediction via look-up tables 有权
标题翻译：用于通过查找表使用叶节点预测的低复杂度MIMO检测的系统和方法
公开(公告)号：US08243843B2
公开(公告)日：2012-08-14
申请号：US13079944
申请日：2011-04-05
申请人： David L. Milliner , Deric W. Waters , Anuj Batra , Srinath Hosur
发明人： David L. Milliner , Deric W. Waters , Anuj Batra , Srinath Hosur
IPC分类号： H04B7/02
CPC分类号： H04L27/2601 , H04L25/0202
摘要： A method for building a look-up table for a receiver in a multiple-input multiple-output (MIMO) detection system simulates a MIMO detector over many channel realizations, tracks channel metric and parameter values used for each channel realization resulting from such simulating, and stores, in a look-up table, best values of the tracked values used for a particular channel metric.
摘要翻译：用于构建多输入多输出（MIMO）检测系统中的接收机的查找表的方法通过许多信道实现来模拟MIMO检测器，跟踪由这样的模拟产生的每个信道实现所使用的信道度量和参数值，并且在查找表中存储用于特定信道度量的被跟踪值的最佳值。

25. 发明授权

US08223870B2 Systems and methods for N-dimensional leaf-node prediction for MIMO detection 有权
标题翻译：用于MIMO检测的N维叶节点预测的系统和方法
公开(公告)号：US08223870B2
公开(公告)日：2012-07-17
申请号：US12048211
申请日：2008-03-13
申请人： Deric Waters , Anuj Batra , Srinath Hosur
发明人： Deric Waters , Anuj Batra , Srinath Hosur
IPC分类号： H04L1/02
CPC分类号： H04B7/0413 , H04L25/0204 , H04L25/0242 , H04L25/0246
摘要： Embodiments achieve favorable performance-complexity trade-offs in MIMO detection for three or more channel inputs. Some embodiments describe systems and methods comprising a leaf node predictor for receiving a processed communications stream, determining at least one channel metric corresponding to the communications stream for a given channel realization, and generating at least three instructions to output, which at least one instruction corresponds to at least one predicted best leaf node candidate for the given channel realization. Further embodiments alternatively describe systems and methods which enumerate N1 best values of a first symbol, enumerate N2(i) best values of a second symbol for an i-th best value of the first symbol, enumerate N3(i, j) best values of a third symbol for an i-th best value of the first symbol and j-th best value of the second symbol, combine enumerated best values of each symbol into a leaf-node value, and compute the cost of each leaf-node value enumerated.
摘要翻译：实现在三个或更多个信道输入的MIMO检测中实现有利的性能 - 复杂度权衡。一些实施例描述了包括用于接收经处理的通信流的叶节点预测器的系统和方法，为给定的信道实现确定与通信流相对应的至少一个信道量度，以及生成至少三个指令以输出哪些指令对应到给定信道实现的至少一个预测的最佳叶节点候选。另外的实施例可选地描述列举第一符号的N1个最佳值的系统和方法，列举第一符号的第i个最佳值的第二个符号的第二个符号的最佳值（N（i，j）第一符号的第i个最佳值和第二个符号的第j个最佳值的第三个符号将每个符号的枚举最佳值组合成叶节点值，并计算枚举的每个叶节点值的成本。

26. 发明授权

US08023577B2 Systems and methods for efficient channel classification 有权
标题翻译：高效渠道分类的系统和方法
公开(公告)号：US08023577B2
公开(公告)日：2011-09-20
申请号：US12024029
申请日：2008-01-31
申请人： Tarkesh Pande , Deric W. Waters , Srinath Hosur , Anuj Batra
发明人： Tarkesh Pande , Deric W. Waters , Srinath Hosur , Anuj Batra
IPC分类号： H04B17/00 , H04B3/46 , H04Q1/20
CPC分类号： H04L25/0204 , H04B7/0417 , H04B7/066 , H04L2025/03426
摘要： Embodiments provide a system and method for efficiently classifying different channel types in an orthogonal frequency division multiplexing (OFDM) system. Embodiments quantify the frequency selectivity in a channel by measuring the variation in a particular channel statistic across sub-carriers in an OFDM system, involve minimal complexity in implementation, and can be used in a variety of scenarios. One embodiment is a method for classifying channels in an OFDM system, comprising measuring variation of at least one channel statistic across sub-carriers, quantifying the variation to determine a measurement value, and applying the measurement value to at least one threshold to classify the channel.
摘要翻译：实施例提供了一种用于在正交频分复用（OFDM）系统中有效地分类不同信道类型的系统和方法。实施例通过测量OFDM系统中跨子载波的特定信道统计量的变化来量化信道中的频率选择性，涉及实现中的最小复杂度，并且可以用于各种情况。一个实施例是一种用于对OFDM系统中的信道进行分类的方法，包括测量跨越子载波的至少一个信道统计量的变化，量化变化以确定测量值，以及将测量值应用于至少一个阈值以对信道进行分类。

27. 发明授权

US07945008B2 Systems and methods for lattice enumeration-aided detection 有权
标题翻译：网格计数辅助检测系统和方法
公开(公告)号：US07945008B2
公开(公告)日：2011-05-17
申请号：US12032309
申请日：2008-02-15
申请人： David L. Milliner , Anuj Batra , Srinath Hosur , Deric W. Waters
发明人： David L. Milliner , Anuj Batra , Srinath Hosur , Deric W. Waters
IPC分类号： H04L7/00
CPC分类号： H04L25/03242 , H04L27/2647 , H04L2025/03426
摘要： Embodiments provide systems and methods for improved multiple-input, multiple-output (MIMO) detection comprising generating at least one list of candidate vectors by employing lattice enumeration which approximates hyperellipsoid detection search space and calculating a reliability of the candidate vectors. At least one advantage to embodiments is that improved detection occurs because detection can be performed in a search space defined by the eigenvectors (which define the general shape of an ellipsoid/hyperellipsoid, depending upon number of dimensions) and eigenvalues (which provide the appropriate scaling in each direction of the eigenvectors) of the effective channel.
摘要翻译：实施例提供了用于改进多输入多输出（MIMO）检测的系统和方法，包括通过采用接近超声检测搜索空间并计算候选向量的可靠性的点阵列表来生成候选向量的至少一个列表。对于实施例的至少一个优点是发生改进的检测，因为检测可以在由特征向量定义的搜索空间中执行（其定义为椭圆体的一般形状/取决于维数）和特征值（其提供适当的缩放在特征向量的每个方向上）有效信道。

28. 发明申请

US20080310538A1 Versatile System for Dual Carrier Transformation in Orthogonal Frequency Division Multiplexing 审中-公开
标题翻译：在正交频分复用中双载波变换的多功能系统
公开(公告)号：US20080310538A1
公开(公告)日：2008-12-18
申请号：US12198630
申请日：2008-08-26
申请人： Srinath Hosur , Jaiganesh Balakrishnan , Anuj Batra
发明人： Srinath Hosur , Jaiganesh Balakrishnan , Anuj Batra
IPC分类号： H04L27/28
CPC分类号： H04L27/2602 , H04B1/7176
摘要： The present invention provides a versatile system for selectively spreading carrier data across multiple carrier paths within an Orthogonal Frequency Division Multiplexing (OFDM) system (200), particularly an ultra-wideband (UWB) system. The present invention provides a data input (202), which passes data to a randomizer (204). The data then passes to a convolutional code function (206), the output of which is punctured by puncturing function (208). An interleaver function (210) receives the punctured code data, and cooperatively operates with a mapper element (218) to prepare the coded data for pre-transmission conversion by an IFFT (220). The mapper element (218) comprises a dual carrier modulation function (216), which associates and transforms two punctured code data elements into a format for transmission on two separate signal tones.
摘要翻译：本发明提供了一种通用系统，用于在正交频分复用（OFDM）系统（200），特别是超宽带（UWB）系统内的多个载波路径上选择性地扩展载波数据。本发明提供一种将数据传递给随机发生器（204）的数据输入（202）。数据然后传递到卷积码功能（206），其输出被穿孔功能（208）打孔。交织器功能（210）接收穿孔码数据，并与映射器元件（218）协作操作，以通过IFFT（220）准备用于预传输转换的编码数据。映射器元件（218）包括双载波调制功能（216），其将两个穿孔码数据元素相关联并变换为用于在两个分离的信号音调上传输的格式。

29. 发明申请

US20080212461A1 TRANSFORM-BASED SYSTEMS AND METHODS FOR RECONSTRUCTING STEERING MATRICES IN A MIMO-OFDM SYSTEM 审中-公开
标题翻译：基于变换的系统和用于重构MIMO-OFDM系统中的转向矩阵的方法
公开(公告)号：US20080212461A1
公开(公告)日：2008-09-04
申请号：US12040750
申请日：2008-02-29
申请人： Tarkesh Pande , Srinath Hosur , Anuj Batra
发明人： Tarkesh Pande , Srinath Hosur , Anuj Batra
IPC分类号： H04J11/00
CPC分类号： H04B7/0417 , H04B7/0626 , H04B7/0634 , H04B7/0639 , H04B7/066 , H04L5/0023 , H04L25/0248 , H04L25/03343 , H04L2025/03426 , H04L2025/03802
摘要： Embodiments provide a transform-based method for representing steering matrices in transmit beamforming for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Beamforming embodiments generate a transform-based representation of steering matrices for at least a subset of sub-carriers for which channel information is known. In some embodiments, a beamformer is able to receive transform matrices information for at least a subset of channel sub-carriers, and generate corresponding channel sub-carrier steering matrices. Some embodiments of a beamformee are able to map at least a subset of channel sub-carrier steering matrices to corresponding transform matrices information prior to transmitting the transform matrix information to a beamformer. Other embodiments of a beamformer are able to receive channel information for at least a subset of sub-carriers of a channel, and compute a transform-based representation of a steering matrix for each sub-carrier for which channel information is known.
摘要翻译：实施例提供了一种用于表示多输入多输出正交频分复用（MIMO-OFDM）系统的发射波束成形中的导引矩阵的基于变换的方法。波束形成实施例为已知信道信息的子载波的至少一个子集生成导向矩阵的基于变换的表示。在一些实施例中，波束形成器能够接收用于信道子载波的至少子集的变换矩阵信息，并且生成相应的信道子载波导引矩阵。在将变换矩阵信息发送到波束形成器之前，波束形成器的一些实施例能够将信道子载波导引矩阵的至少一个子集映射到对应的变换矩阵信息。波束形成器的其他实施例能够接收信道的子载波的至少一个子集的信道信息，并且为已知信道信息的每个子载波计算导频矩阵的基于变换的表示。

30. 发明申请

US20080181322A1 SYSTEMS AND METHODS FOR HYBRID-MIMO EQUALIZATION 有权
标题翻译：用于混合MIMO均衡的系统和方法
公开(公告)号：US20080181322A1
公开(公告)日：2008-07-31
申请号：US12022307
申请日：2008-01-30
申请人： Deric W. Waters , Anuj Batra , Srinath Hosur
发明人： Deric W. Waters , Anuj Batra , Srinath Hosur
IPC分类号： H04L27/28 , G06F17/16
CPC分类号： H04L25/03006 , H04L2025/03414 , H04L2025/03426 , H04L2025/03605
摘要： Embodiments provide systems and methods for a novel multiple-input multiple-output (MIMO) equalization technique that produces a channel matrix that contains partly real coefficients and partly complex coefficients, referred to herein as a hybrid-MIMO equalization. MIMO detectors can exploit the hybrid-MIMO equalization to reduce complexity. Some embodiments provide systems and methods for equalizing a communication channel comprising receiving as an input a channel output vector, dividing the input into two vectors, a first vector that remains a complex number and a second vector that contains only real numbers, separating the second vector into its real and imaginary components, and regrouping the first and second vectors into a hybrid channel output vector that contains both real and complex coefficients.
摘要翻译：实施例提供了一种新颖的多输入多输出（MIMO）均衡技术的系统和方法，其产生包含部分实系数和部分复系数的信道矩阵，这里称为混合MIMO均衡。 MIMO检测器可以利用混合MIMO均衡来降低复杂度。一些实施例提供用于均衡通信信道的系统和方法，包括：接收作为输入的信道输出向量，将输入划分成两个向量，保留复数的第一向量和仅包含实数的第二向量，将第二向量转换成其实部和虚部，并将第一和第二矢量重新分组成包含实数和复系数的混合信道输出向量。

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