公开(公告)号：US08654663B2

公开(公告)日：2014-02-18

申请号：US13080374

申请日：2011-04-05

Applicant: Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04L12/28 ,  H04W4/00 ,  H04L12/56

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0486 ,  H04W52/346 ,  H04W72/0406 ,  H04W72/085

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08625695B2

公开(公告)日：2014-01-07

申请号：US13115162

申请日：2011-05-25

Applicant: Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

Inventor： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04B7/0452 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/0665 ,  H04L5/0023 ,  H04L5/0094

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08615171B2

公开(公告)日：2013-12-24

申请号：US13077748

申请日：2011-03-31

Applicant: Neda Cvijetic ,  Narayan Prasad ,  Dayou Qian ,  Ting Wang

Inventor： Neda Cvijetic ,  Narayan Prasad ,  Dayou Qian ,  Ting Wang

IPC: H04B10/00

CPC classification number: H04L25/0208 ,  H04J14/06 ,  H04L25/022 ,  H04L25/024 ,  H04L27/2647

Abstract: A method for joint transmitter and receiver processing for computationally efficient equalization in polarization multiplexed (POLMUX) optical orthogonal frequency division multiplexed (OFDM) transmission with direct detection.

Abstract translation: 一种用于在具有直接检测的偏振复用（POLMUX）光学正交频分复用（OFDM）传输中的计算上有效均衡的联合发射机和接收机处理方法。

公开(公告)号：US20130250868A1

公开(公告)日：2013-09-26

申请号：US13622012

申请日：2012-09-18

Applicant: Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan

Inventor： Guosen Yue ,  Narayan Prasad ,  Sampath Rangarajan

IPC: H04W72/06

CPC classification number: H04W72/06 ,  H04L5/0037 ,  H04L27/2601

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08488441B2

公开(公告)日：2013-07-16

申请号：US13414244

申请日：2012-03-07

Applicant: Luca Venturino ,  Xiaodong Wang ,  Narayan Prasad

Inventor： Luca Venturino ,  Xiaodong Wang ,  Narayan Prasad

IPC: H04J11/00

CPC classification number: H04W16/28

Abstract: 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.

公开(公告)号：US20130170366A1

公开(公告)日：2013-07-04

申请号：US13561805

申请日：2012-07-30

Applicant: Narayan PRASAD ,  Honghai ZHANG ,  Sampath RANGARAJAN

Inventor： Narayan PRASAD ,  Honghai ZHANG ,  Sampath RANGARAJAN

IPC: H04W72/08

CPC classification number: H04W72/085 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0048 ,  H04W72/1231

Abstract: Disclosed herein are techniques, methods, and apparatus pertaining to a multi-user scheduling in 4G and 3GPP LTE cellular uplinks.

Abstract translation: 这里公开了与4G和3GPP LTE蜂窝上行链路中的多用户调度有关的技术，方法和装置。

公开(公告)号：US08472554B2

公开(公告)日：2013-06-25

申请号：US13088928

申请日：2011-04-18

Applicant: Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

Inventor： Mohammad A. Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan

IPC: H04L27/00

CPC classification number: H04B7/0452 ,  H04J11/0046 ,  H04L5/0023 ,  H04L25/03331 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/34 ,  H04W72/042 ,  H04W72/12

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08432989B2

公开(公告)日：2013-04-30

申请号：US12549574

申请日：2009-08-28

Applicant: Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

IPC: H04B7/02 ,  H04L1/02

CPC classification number: H04L25/03318 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/03203 ,  H04L2025/0342 ,  H04L2025/03426

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08385454B2

公开(公告)日：2013-02-26

申请号：US12878258

申请日：2010-09-09

Applicant: Ali Tajer ,  Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

Inventor： Ali Tajer ,  Narayan Prasad ,  Xiaodong Wang ,  Sampath Rangarajan

IPC: H04L1/02 ,  H04B7/02

CPC classification number: H04B7/0626 ,  H04B7/022

Abstract: 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.

公开(公告)号：US08335534B2

公开(公告)日：2012-12-18

申请号：US12388428

申请日：2009-02-18

Applicant: Hoonghai Zhang ,  Sampath Rangarajan ,  Luca Venturino ,  Narayan Prasad

Inventor： Hoonghai Zhang ,  Sampath Rangarajan ,  Luca Venturino ,  Narayan Prasad

IPC: H04B7/00

CPC classification number: H04W52/241 ,  H04W52/281

Abstract: 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.

Abstract translation: 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。