公开(公告)号：US09191962B2

公开(公告)日：2015-11-17

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: H04L5/00 ,  H04W72/08 ,  H04W72/12

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：US09055561B2

公开(公告)日：2015-06-09

申请号：US12642126

申请日：2009-12-18

Applicant: Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

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

CPC classification number: 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

Abstract: 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.

Abstract translation: 在OFDMA-MU-MIMO系统中向任何给定用户传送或发送给其他协调调度用户的信息的方法和系统，以允许用户对接收到的数据执行纠错和/或对其接收信号的干扰减少。 调度信息可以包括资源块分配，采用的调制星座，采用的编码率，使用的功率电平和使用的预编码器矩阵索引。 此外，可以部分地通过专用参考符号层或导频流来传送调度信息。 此外，基站可以向MU-MIMO用户发送基站期望调度的用户总数或总用户数的上限的初步估计，以允许MU-MIMO用户确定 优选的预编码器矩阵索引和信道质量指标的指示。

公开(公告)号：US08750358B2

公开(公告)日：2014-06-10

申请号：US13441231

申请日：2012-04-06

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

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

IPC: H04B17/00

CPC classification number: H04B7/0452 ,  H04B7/0417 ,  H04B7/0469 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/0639 ,  H04L1/0013 ,  H04L1/0015 ,  H04L1/0021 ,  H04L1/0035 ,  H04L25/03949 ,  H04L2025/03808

Abstract: A method for improving multiple-input multiple-output MIMO downlink transmissions includes obtaining a channel state information CSI report including preferred matrix index PMI for precoding, channel quality index CQI and rank index RI at a base station from user terminals through a channel feedback; applying selectively a signal-to-interference-plus-noise-ratio SINR offset to a SINR of said CSI report; applying selectively a rate matching responsive to SINR offset or the CSI report; and controlling or adjusting the SINR offset.

Abstract translation: 一种用于改善多输入多输出MIMO下行链路传输的方法包括从用户终端通过信道反馈获得包括用于预编码的优选矩阵索引PMI，信道质量指数CQI和基站处的秩索引RI的信道状态信息CSI报告; 选择性地对所述CSI报告的SINR应用信号与干扰加噪声比SINR偏移量; 选择性地应用响应于SINR偏移量或CSI报告的速率匹配; 并控制或调整SINR偏置。

公开(公告)号：US08705392B2

公开(公告)日：2014-04-22

申请号：US13080416

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: H04L12/26 ,  H04W4/00 ,  H04B7/02

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 includes 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. The method further includes 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 in accordance with at least one of single-user scheduling rules or multi-user scheduling rules. In addition, the method includes transmitting to the base station an indication of the one or more signal quality measures and at least one tag identifying each signal quality measure as being determined in accordance with the single-user scheduling rules or the multi-user scheduling rules.

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，对由基站在...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。 所述方法还包括基于由所述基站在所述至少一个子带上调度的流的总数的估计或所述上限来确定所述至少一个子带的一个或多个信号质量度量 根据单用户调度规则或多用户调度规则中的至少一个。 此外，该方法包括向基站发送一个或多个信号质量测量的指示，以及标识每个信号质量测量的至少一个标签，根据单用户调度规则或多用户调度规则确定 。

公开(公告)号：US08660598B2

公开(公告)日：2014-02-25

申请号：US12941575

申请日：2010-11-08

Applicant: Narayan Prasad ,  Kishore Ramachandran ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Kishore Ramachandran ,  Sampath Rangarajan

IPC: H04B7/00 ,  H04B15/00

CPC classification number: H04B7/0408 ,  H04B1/1027 ,  H04B7/063 ,  H04B7/0695 ,  H04B7/088

Abstract: Methods and systems for enabling the rectification of deteriorated channel conditions on a communication link are described. In particular, the methods and systems can employ mechanisms that prioritize beams in accordance with signal quality measures, direction of departures of transmission beams and/or direction of arrivals of reception beams to address variable channel conditions.

Abstract translation: 描述了能够在通信链路上整流恶化的信道条件的方法和系统。 特别地，方法和系统可以采用根据信号质量测量，发射波束的偏离方向和/或接收波束的到达方向对波束进行优先化的机制，以解决可变信道条件。

公开(公告)号：US20130170422A1

公开(公告)日：2013-07-04

申请号：US13621293

申请日：2012-09-17

Applicant: Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Hao Zhu ,  Sampath Rangarajan

IPC: H04W4/06

CPC classification number: H04W4/06

Abstract: 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.

Abstract translation: 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：US20120294381A1

公开(公告)日：2012-11-22

申请号：US13562738

申请日：2012-07-31

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: H04L27/28 ,  H04B7/00

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

Abstract: A method implemented in a user equipment used in a multi-user multiple input multiple output (MU-MIMO) wireless communications system is disclosed. The method includes receiving from a base station an indication of a first modulation type for the user equipment, receiving a first data signal for the user equipment, receiving a second data signal for a co-scheduled user equipment, where a second modulation type for the co-scheduled user equipment is unknown to the user equipment, and deciding the second modulation type. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在多用户多输入多输出（MU-MIMO）无线通信系统中使用的用户设备中实现的方法。 该方法包括从基站接收用户设备的第一调制类型的指示，接收用户设备的第一数据信号，为共同调度的用户设备接收第二数据信号，其中第二调制类型为 共同调度的用户设备对于用户设备是未知的，并且确定第二调制类型。 还公开了其它方法，系统和装置。

公开(公告)号：US20120281662A1

公开(公告)日：2012-11-08

申请号：US13550099

申请日：2012-07-16

Applicant: Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

Inventor： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Meilong Jiang ,  Xiaodong Wang ,  Sampath Rangarajan

IPC: H04W72/08 ,  H04W72/12

CPC classification number: 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

Abstract: 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.

Abstract translation: 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：US20120251110A1

公开(公告)日：2012-10-04

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: H04J14/06 ,  H04L27/01

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：US08254859B2

公开(公告)日：2012-08-28

申请号：US13111521

申请日：2011-05-19

Applicant: Mohammad A. Khojastepour ,  Narayan Prasad

Inventor： Mohammad A. Khojastepour ,  Narayan Prasad

IPC: H04B1/04

CPC classification number: H04B7/0617 ,  H04B7/0456 ,  H04B7/0632 ,  H04B7/0639

Abstract: 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.

Abstract translation: 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。