公开(公告)号：US20090262872A1

公开(公告)日：2009-10-22

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。

公开(公告)号：US20080188190A1

公开(公告)日：2008-08-07

申请号：US12026120

申请日：2008-02-05

申请人： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Mohammad Madihian ,  Xiaodong Wang

发明人： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Mohammad Madihian ,  Xiaodong Wang

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。

公开(公告)号：US20080069262A1

公开(公告)日：2008-03-20

申请号：US11857273

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： H04B7/02

CPC分类号： H04L1/20 ,  H04L1/208 ,  H04L25/03305 ,  H04L25/03318 ,  H04L25/03993

摘要： A method includes the steps of: i) listing out all possibilities for first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each said first symbol listed out, iii) evaluating a metric for each said first symbol and second symbol pair, iv) determining the exact maximum log likelihood ratio for all bits associated with said first symbol using said metrics, v) decoding a codeword-1 using the maximum log likelihood ratios, vi) re-encoding said codeword-1, vii) modulating said re-encoded codeword-1, viii) subtracting said modulated re-encoded codeword-1 from said two stream signal, ix) determining metrics for all possibilities for second symbol in the signal obtained in viii, x) determining the maximum log likelihood ratios for all bits associated with second symbol, and xi) decoding said codeword-2 using the maximum log likelihood ratios for all bits associated with said second symbol.

摘要翻译： 一种方法包括以下步骤：i）列出双流信号的第一符号的所有可能性; ii）为列出的每个所述第一符号确定两个流信号的第二符号，iii）评估每个所述第一符号和第二符号对的度量，iv）确定与所述第一符号和第二符号对相关联的所有位的精确最大对数似然比 符号，使用所述度量，v）使用最大对数似然比对码字-1进行解码，vi）重新编码所述码字1，vii）调制所述重新编码的码字1，viii）减去所述调制的重新编码的码字 - 1）从所述两个流信号中ix确定在viii中获得的信号中的第二符号的所有可能性的度量，x）确定与第二符号相关联的所有位的最大对数似然比，以及xi）使用 与所述第二符号相关联的所有位的最大对数似然比。

公开(公告)号：US20080069261A1

公开(公告)日：2008-03-20

申请号：US11857251

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： H04L1/02

CPC分类号： H04L1/0631 ,  H04L5/023 ,  H04L25/0232 ,  H04L27/2649

摘要： In accordance with the invention, a method includes determining either the number of tones per chunk required to compute per-chunk order responsive to a sub-band bandwidth, a coherence bandwidth and number of chunks, or the number of chunks responsive to a sub-band bandwidth and a coherence bandwidth; determining an order for each chunk; and determining, for each chunk, QR decompositions for all its tones according to the determined order.

摘要翻译： 根据本发明，一种方法包括：响应于子带带宽，相干带宽和块数量，或响应于子带宽的块的数量来确定每个块所需的每个块所需的每个块的个数， 带宽和相干带宽; 确定每个块的顺序; 并且根据确定的顺序为每个块确定其所有音调的QR分解。

公开(公告)号：US07308860B2

公开(公告)日：2007-12-18

申请号：US11303457

申请日：2005-12-16

申请人： Hardyal Singh ,  Surinder Singh Sehmby ,  Narayan Prasad Mukherjee ,  Gopalsamy Balamurugan ,  Uma Datta ,  Joydeb Roychoudhury

发明人： Hardyal Singh ,  Surinder Singh Sehmby ,  Narayan Prasad Mukherjee ,  Gopalsamy Balamurugan ,  Uma Datta ,  Joydeb Roychoudhury

IPC分类号： D05B27/00 ,  D05B13/00

CPC分类号： D05B15/00 ,  A63B2037/125 ,  A63B2102/20 ,  D05B23/00 ,  D05B31/00 ,  D05C9/04 ,  D10B2507/08

摘要： The present invention relates to a novel sewing machine for decoratively stitching a cricket ball, the machine of the present invention will be particularly useful to provide decorative stitching on hemispherical leather cups prior to assembling them and stitching them to form the cricket ball.

摘要翻译： 本发明涉及一种用于装饰拼接板球的新型缝纫机，本发明的机器在组装之前提供半球形皮革杯子上的装饰缝合并将其拼接形成板球，将是特别有用的。

公开(公告)号：US09100946B2

公开(公告)日：2015-08-04

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 ,  H04W72/04 ,  H04L1/20 ,  H04W28/04 ,  H04W72/12 ,  H04L5/00 ,  H04B7/04 ,  H04L25/02 ,  H04L1/00 ,  H04W8/26 ,  H04B7/06

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。

公开(公告)号：US08917648B2

公开(公告)日：2014-12-23

申请号：US13621293

申请日：2012-09-17

申请人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

发明人： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

IPC分类号： H04W4/06

CPC分类号： H04W4/06

摘要： A method for a transmit precoder for multicast communication over a downlink in a wireless network, including: initializing a transmit precoder, a channel estimate for each user in the wireless network; updating for each user a receive filter and a slack matrix; updating the transmit precoder by solving a second order cone routine solvable in closed form; determining if a predetermined convergence is met; and outputting the updated transmit precoder responsive to the convergence criteria.

摘要翻译： 一种用于无线网络中的下行链路上的组播通信的发送预编码器的方法，包括：初始化发送预编码器，针对无线网络中的每个用户的信道估计; 为每个用户更新接收过滤器和松弛矩阵; 通过解决封闭形式可解的二阶锥体程序来更新传输预编码器; 确定是否满足预定的会聚; 以及响应于所述收敛标准输出所述更新的发送预编码器。

公开(公告)号：US08767888B2

公开(公告)日：2014-07-01

申请号：US13433873

申请日：2012-03-29

申请人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

发明人： Narayan Prasad ,  Neda Cvijetic ,  Sampath Rangarajan ,  Ting Wang

IPC分类号： H04L27/06 ,  H04L25/02 ,  H04L25/06 ,  H04L25/03

CPC分类号： H04L25/0246 ,  H04L25/03171 ,  H04L25/067

摘要： The present invention employs a look up table based implementation for the metric computations which eliminate redundancy and substantially reduce the number of multiplications. Moreover, inventive method exploits the fact that the un-normalized constellation symbols are complex integers so that the product of a real-number and an un-normalized constellation symbol can be implemented by only additions. The inventive method also enables a greater efficiency for whitening colored noise prior to demodulation, one of which involves no square-root operation. The invention results in less complexity, faster operation, lower power consumption, without sacrificing performance.

摘要翻译： 本发明使用用于度量计算的查找表实现，其消除冗余并且显着减少乘法次数。 此外，本发明的方法利用了未归一化的星座符号是复数整数的事实，使得实数和未归一化的星座符号的乘积可以仅通过添加来实现。 本发明的方法还使得能够在解调之前增加有色噪声的效率，其中之一不涉及平方根操作。 本发明导致更少的复杂性，更快的操作，更低的功耗，而不会牺牲性能。

公开(公告)号：US08724573B2

公开(公告)日：2014-05-13

申请号：US13343398

申请日：2012-01-04

申请人： Narayan Prasad ,  Honghai Zhang ,  Meilong Jiang ,  Guosen Yue ,  Sampath Rangarajan

发明人： Narayan Prasad ,  Honghai Zhang ,  Meilong Jiang ,  Guosen Yue ,  Sampath Rangarajan

IPC分类号： H04W72/04 ,  H04W72/06

CPC分类号： H04W72/04 ,  H04B7/0404 ,  H04W72/042 ,  H04W72/06 ,  H04W72/1257

摘要： A method of uplink resource allocation is disclosed. The method includes computing a set of utilities for each of a finite set of transmission modes with a processor across a plurality of user devices, each having multiple transmit antennas, and iteratively allocating uplink resource blocks (RBs) and transmission modes to the plurality of user devices until all users have been allocated or no allocation is found, by selecting a mode that has a highest incremental utility sum for each user across one or more RBs, determining which user has the highest incremental utility sum, allocating the mode and RBs associated with the highest incremental utility sum to the user, and removing the allocated user from consideration. Other apparatuses, systems, and methods also are disclosed.

摘要翻译： 公开了一种上行链路资源分配的方法。 该方法包括：通过跨多个用户设备的处理器计算一组有用传输模式的实用程序，每个用户设备具有多个发射天线，并向多个用户迭代地分配上行链路资源块（RB）和传输模式 设备，直到所有用户已经被分配或没有找到分配，通过选择对于每个用户跨越一个或多个RB具有最高增量效用总和的模式，确定哪个用户具有最高的增量效用总和，分配与 对用户的最大增量效用总和，并从分配中删除分配的用户。 还公开了其他装置，系统和方法。

公开(公告)号：US08660202B2

公开(公告)日：2014-02-25

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： H04L1/02

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。