公开(公告)号：US20120275313A1

公开(公告)日：2012-11-01

申请号：US13456845

申请日：2012-04-26

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

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

IPC: H04W24/10

CPC classification number: H04W24/10 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0469 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/065

Abstract: A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system is disclosed. In an aspect, the user equipment transmits to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule and a second CSI report based on a residual error.

Abstract translation: 公开了一种在配置成在多用户（MU）多输入多输出（MIMO）无线通信系统中使用的用户设备中实现的方法。 一方面，用户设备向基站发送根据单用户（SU）MIMO规则确定的第一信道状态信息（CSI）报告和基于残差的第二CSI报告。

公开(公告)号：US08255778B2

公开(公告)日：2012-08-28

申请号：US12435249

申请日：2009-05-04

Applicant: Narayan Prasad ,  Xiaodong Wang

Inventor： Narayan Prasad ,  Xiaodong Wang

IPC: H03M13/15 ,  H03M13/17 ,  H03M13/45

CPC classification number: H04L1/1845 ,  H03M13/09 ,  H03M13/6306 ,  H03M13/6337

Abstract: A method for decoding of multiple wireless signals by a chase combining hybrid-automatic-repeat-request CC-HARQ receiver includes demodulating wireless signals received from respective mobile sources using an effective channel matrix and decision statistics; updating log-likelihood-ratios LLRs and decoding the received codewords using the corresponding updated LLRs; determining set of correctly decoded codewords using a cyclic redundancy check; updating the effective channel matrix and decision statistics responsive to the step of determining; and resetting the effective channel matrix and decision statistics in the event that the number of decoding errors for a codeword exceeds its maximum limit after storing the updated LLRs of all remaining erroneously decoded codewords for which the number of decoding errors is below the respective maximum limit.

Abstract translation: 通过追踪组合混合自动重复请求CC-HARQ接收机对多个无线信号进行解码的方法包括使用有效信道矩阵和判定统计解调从相应移动源接收的无线信号; 更新对数似然比LLR并使用相应的更新的LLR对接收的码字进行解码; 使用循环冗余校验来确定正确解码的码字集合; 响应于确定步骤更新有效信道矩阵和决策统计; 并且在存储解码错误数量低于相应最大限制的所有剩余的错误解码的码字的更新的LLR之后，在码字的解码错误的数量超过其最大限制的情况下重置有效信道矩阵和判定统计。

公开(公告)号：US20120114030A1

公开(公告)日：2012-05-10

申请号：US13292659

申请日：2011-11-09

Applicant: Guosen Yue ,  Narayan Prasad ,  Meilong Jiang ,  Sampath Rangarajan

Inventor： Guosen Yue ,  Narayan Prasad ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04L25/49 ,  H04B17/00

CPC classification number: H04L5/0055 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/1819 ,  H04L1/1867 ,  H04L25/03923 ,  H04W52/48

Abstract: A method includes obtaining a precoder for retransmission of one codeword responsive to known precoding matrix P of rank r and modulation and coding scheme MCS assignments used in an original transmission, and a desired retransmission rank r′; and scaling power in the retransmission responsive to at least two of 1) information parameters Index of UL precoder in previous transmission, 2) rank r of uplink UL precoder in previous transmission, 3) MCS assignments in previous retransmission (MCSi), 4) rank r′ UL retransmission 5) number of retransmit antennas used thr codeword to be retransmitted x in previous transmission, 6) number of retransmit antennas x′ used for retransmission, 7) precoder for UL retransmission, 8) UL precoders and channel information for previous transmission, and 8) latest channel measurements.

Abstract translation: 一种方法包括响应于已知的秩r的预编码矩阵P以及在原始传输中使用的调制和编码方案MCS分配以及期望的重传等级r'，获得用于重传一个码字的预编码器。 并且响应于以前的传输中的UL预编码器的信息参数索引中的至少两个，2）先前传输中的上行链路UL预编码器的秩r，先前传输中的MCS分配（MCSi），4）等级 r'UL重传5）先前传输中要重传的码字x所使用的重传天线数量6）重传用的重传天线数x'7）用于UL重传的预编码器8）用于先前传输的UL预编码器和信道信息 ，和8）最新的频道测量。

公开(公告)号：US08174959B2

公开(公告)日：2012-05-08

申请号：US12399769

申请日：2009-03-06

Applicant: Kai Yang ,  Narayan Prasad ,  Xiaodong Wang

Inventor： Kai Yang ,  Narayan Prasad ,  Xiaodong Wang

IPC: H04J11/00 ,  H04J3/16

CPC classification number: H04L5/0007 ,  H04L5/0032 ,  H04L5/0037 ,  H04L5/0046 ,  H04W52/243 ,  H04W52/262 ,  H04W52/267 ,  H04W52/346 ,  H04W72/1257

Abstract: Systems and methods to assign one or more resources in a multi-user cellular Orthogonal Frequency-Division Multiple Access (OFDMA) uplink includes specifying a resource allocation problem for one or more resources; converting the resource allocation problem into an assignment problem; solving the assignment problem through an auction; and allocating one or more resources to cellular users to maximize a system utility.

Abstract translation: 在多用户蜂窝正交频分多址（OFDMA）上行链路中分配一个或多个资源的系统和方法包括：为一个或多个资源指定资源分配问题; 将资源分配问题转化为分配问题; 通过拍卖解决作业问题; 并将一个或多个资源分配给蜂窝用户以最大化系统效用。

公开(公告)号：US20110243019A1

公开(公告)日：2011-10-06

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

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，以及将每个信号质量测量标识为根据单用户调度规则或多用户调度规则确定的至少一个标签 。

公开(公告)号：US20110243017A1

公开(公告)日：2011-10-06

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: H04W24/06

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：US08014460B2

公开(公告)日：2011-09-06

申请号：US11613407

申请日：2006-12-20

Applicant: Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

Inventor： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

IPC: H04B7/02

CPC classification number: H04L25/03203 ,  H04L25/0204

Abstract: A MMSE-based deterministic sequential Monte Carlo (SMC) method for MIMO demodulation exhibiting square root complexity in terms of constellation size. Further extensions to the method reduce the search space resulting in significant reduction in computational requirements while minimally impacting performance. As a hard decision algorithm, the methods achieve sphere decoder performance while imposing a much smaller computational load.

Abstract translation: 基于MMSE的确定性顺序蒙特卡罗（SMC）方法，用于在星座大小方面表现出平方根复杂度的MIMO解调。 该方法的进一步扩展减少了搜索空间，导致计算需求的显着降低，同时最小程度上影响了性能。 作为硬判决算法，该方法实现了球体解码器的性能，同时施加了更小的计算量。

公开(公告)号：US07949318B2

公开(公告)日：2011-05-24

申请号：US12026120

申请日：2008-02-05

Applicant: Narayan Prasad ,  Mohammad Ali Khojastepour ,  Mohammad Madihian ,  Xiaodong Wang

Inventor： Narayan Prasad ,  Mohammad Ali Khojastepour ,  Mohammad Madihian ,  Xiaodong Wang

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。

公开(公告)号：US20110070911A1

公开(公告)日：2011-03-24

申请号：US12722761

申请日：2010-03-12

Applicant: Honghai Zhang ,  Narayan Prasad ,  Sampath Rangarajan

Inventor： Honghai Zhang ,  Narayan Prasad ,  Sampath Rangarajan

IPC: H04B7/00

CPC classification number: H04W72/0453 ,  H04B17/0085 ,  H04B17/0087 ,  H04B17/345 ,  H04B17/382 ,  H04W16/02 ,  H04W16/10

Abstract: Fractional frequency reuse systems and methods for assigning physical resource units of an available frequency band to sectors of cells are disclosed. In particular, the systems and methods permit adaptation of frequency configuration partitions to mobile station or throughput distribution within cells while at the same time ensuring mitigation of interference between neighboring sectors of different cells.

Abstract translation: 公开了用于将可用频带的物理资源单元分配给小区扇区的分数频率重用系统和方法。 特别地，系统和方法允许将频率配置分区适配到移动站或小区内的吞吐量分布，同时确保减轻不同小区的相邻扇区之间的干扰。

公开(公告)号：US20100158150A1

公开(公告)日：2010-06-24

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: H04L5/12 ,  H04L27/06

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。