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51. 发明授权

US08510433B2 Beam combination methods and systems for adapting communication links to varying channel conditions 有权
标题翻译：光束组合方法和系统，用于使通信链路适应不同的信道条件
公开(公告)号：US08510433B2
公开(公告)日：2013-08-13
申请号：US12941546
申请日：2010-11-08
申请人： Kishore Ramachandran , Narayan Prasad , Sampath Rangarajan
发明人： Kishore Ramachandran , Narayan Prasad , Sampath Rangarajan
IPC分类号： G06F15/16
CPC分类号： H04B7/0408 , H04B1/1027 , H04B7/063 , H04B7/0695 , H04B7/088
摘要： Methods and systems for rectifying deteriorated channel conditions on a communication link are described. In response to the detection of a link deterioration event, a cluster of beams about a currently utilized beam pair can be trialed to determine a suitable, alternate pair of beams on which to establish a communication link. In turn, in the case of a link blockage event, a set of beams having a relatively large azimuthal angle with respect to a currently utilized beam pair can be trialed to determine a suitable beam pair for further communication.
摘要翻译：描述了用于整流通信链路恶化的信道条件的方法和系统。响应于链路劣化事件的检测，可以尝试关于当前使用的波束对的一束波束，以确定在其上建立通信链路的合适的一对波束。反过来，在链路阻塞事件的情况下，可以对相对于当前利用的波束对具有相对大的方位角的一组波束进行试验，以确定用于进一步通信的合适的波束对。

52. 发明申请

US20120275313A1 Enhancement of Download Multi-User Multiple-Input Multiple-Output Wireless Communications 有权
标题翻译：下载多用户多输入多输出无线通信的增强
公开(公告)号：US20120275313A1
公开(公告)日：2012-11-01
申请号：US13456845
申请日：2012-04-26
申请人： Narayan Prasad , Guosen Yue , Meilong Jiang , Mohammad A. Khojastepour , Sampath Rangarajan
发明人： Narayan Prasad , Guosen Yue , Meilong Jiang , Mohammad A. Khojastepour , Sampath Rangarajan
IPC分类号： H04W24/10
CPC分类号： H04W24/10 , H04B7/0417 , H04B7/0452 , H04B7/0469 , H04B7/0486 , H04B7/0626 , H04B7/063 , H04B7/065
摘要： 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.
摘要翻译：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。

53. 发明申请

US20120114030A1 Power Scaling for Retransmissions in Uplink MIMO Hybrid ARQ 有权
标题翻译：上行MIMO混合ARQ中的重传功率缩放
公开(公告)号：US20120114030A1
公开(公告)日：2012-05-10
申请号：US13292659
申请日：2011-11-09
申请人： Guosen Yue , Narayan Prasad , Meilong Jiang , Sampath Rangarajan
发明人： Guosen Yue , Narayan Prasad , Meilong Jiang , Sampath Rangarajan
IPC分类号： H04L25/49 , H04B17/00
CPC分类号： H04L5/0055 , H04L1/0003 , H04L1/0009 , H04L1/1819 , H04L1/1867 , H04L25/03923 , H04W52/48
摘要： 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.
摘要翻译：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。

54. 发明申请

US20110243019A1 MU-MIMO-OFDMA MULTI-RANK CQI AND PRECODER SIGNALING SCHEMES 有权
标题翻译： MU-MIMO-OFDMA多级CQI和预编码信令方案
公开(公告)号：US20110243019A1
公开(公告)日：2011-10-06
申请号：US13080416
申请日：2011-04-05
申请人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
发明人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
IPC分类号： H04L12/26 , H04W4/00
CPC分类号： H04W24/08 , H04B7/0452 , H04B7/0465 , H04B7/0486 , H04W52/346 , H04W72/0406 , H04W72/085
摘要： 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.
摘要翻译：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。

55. 发明申请

US20110070911A1 METHODS AND SYSTEMS FOR DYNAMIC AND CONFIGURATION BASED FRACTIONAL FREQUENCY REUSE FOR UNEVEN LOAD DISTRIBUTIONS 有权
标题翻译：用于动态和配置的方法和系统，用于未来负载分配的分数频率重用
公开(公告)号：US20110070911A1
公开(公告)日：2011-03-24
申请号：US12722761
申请日：2010-03-12
申请人： Honghai Zhang , Narayan Prasad , Sampath Rangarajan
发明人： Honghai Zhang , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04B7/00
CPC分类号： H04W72/0453 , H04B17/0085 , H04B17/0087 , H04B17/345 , H04B17/382 , H04W16/02 , H04W16/10
摘要： 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.
摘要翻译：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。

56. 发明申请

US20100158150A1 MAX-LOG STACK DECODER 有权
标题翻译：最大日志堆栈解码器
公开(公告)号：US20100158150A1
公开(公告)日：2010-06-24
申请号：US12549574
申请日：2009-08-28
申请人： Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
发明人： Narayan Prasad , Xiaodong Wang , Sampath Rangarajan
IPC分类号： H04L5/12 , H04L27/06
CPC分类号： H04L25/03318 , H04L25/0204 , H04L25/0246 , H04L25/03203 , H04L2025/0342 , H04L2025/03426
摘要： 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.
摘要翻译：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。

57. 发明授权

US08699621B2 Precoding selection for retransmission in uplink MIMO hybrid ARQ 有权
标题翻译：上行MIMO混合ARQ中重传的预编码选择
公开(公告)号：US08699621B2
公开(公告)日：2014-04-15
申请号：US13252650
申请日：2011-10-04
申请人： Guosen Yue , Narayan Prasad , Meilong Jiang , Sampath Rangarajan
发明人： Guosen Yue , Narayan Prasad , Meilong Jiang , Sampath Rangarajan
IPC分类号： H04L27/00
CPC分类号： H04B7/0456 , H04L1/0618 , H04L1/1896 , H04L25/03343 , H04L2025/03426
摘要： A method includes obtaining a precoder for retransmission of one codeword responsive to a known precoding matrix of a certain rank and modulation and coding scheme assignments used in an original transmission, and a desired retransmission rank', forming an approximate channel covariance matrix; stimating an a minimum mean square error receiver signal-to-noise-interference-ratio for each layer to be retransmitted responsive to the prior forming; and finding a precoding matrix from a preceding codebook that maximizes a sum-rate for enabling precoding selections for retransmissions in uplink multiple-input multiple-output MIMO hybrid automatic repeat request HARQ.
摘要翻译：一种方法包括响应于某一秩的已知预编码矩阵和在原始传输中使用的调制和编码方案分配以及形成近似信道协方差矩阵的期望重传等级来获得用于重传一个码字的预编码器; 响应于先前的形成，针对要重传的每个层激发最小均方误差接收机的信噪比干扰比; 以及从上一个码本中找到一个预编码矩阵，该预编码矩阵使上行链路多输入多输出MIMO混合自动重复请求HARQ中的重传的预编码选择最大化。

58. 发明授权

US08687527B2 Low complexity link adaptatation for LTE/LTE-A uplink with a turbo receiver 有权
标题翻译：具有turbo接收机的LTE / LTE-A上行链路的低复杂度链路适配
公开(公告)号：US08687527B2
公开(公告)日：2014-04-01
申请号：US13234885
申请日：2011-09-16
申请人： Meilong Jiang , Narayan Prasad , Guosen Yue , Sampath Rangarajan
发明人： Meilong Jiang , Narayan Prasad , Guosen Yue , Sampath Rangarajan
IPC分类号： H04B7/005 , H04B1/00
CPC分类号： H04B7/0417 , H04B7/0404 , H04B7/0486 , H04B7/0626 , H04B7/063 , H04B7/0639 , H04J11/0033 , H04L1/0031 , H04L5/0023
摘要： An inventive method for link adaptation for an LTE/LTE-A uplink with a turbo SIC receiver includes the steps of determining a precoding matrix index PMI and rank index RI selection for an LTE/LTE-A uplink when precoding of the uplink is enabled, responsive to channel state information of a subcarrier in the uplink; determining a decoding order for codewords in the uplink i) when the precoding of the uplink is not enabled and ii) if needed when the precoding of the uplink is enabled; performing modulation and coding scheme MCS assignment for the uplink based on a hard decision successive interference cancellation SIC rule (without intra-CW cancellation) or a partial hard decision successive interference cancellation SIC rule (with intra-CW cancellation), responsive to the determined PMI and RI selection; and influencing data transmission in the uplink responsive to the MCS assignment for detection by a turbo SIC receiver.
摘要翻译：用于具有turbo SIC接收机的LTE / LTE-A上行链路的链路适配的创新方法包括以下步骤：当启用上行链路的预编码时，确定LTE / LTE-A上行链路的预编码矩阵索引PMI和秩索引RI选择，响应于所述上行链路中的子载波的信道状态信息; 确定所述上行链路中的码字的解码顺序i）当所述上行链路的预编码不被使能时，以及ii）如果在启用所述上行链路的预编码时需要; 基于硬判决连续干扰消除SIC规则（无内部CW消除）或部分硬判决连续干扰消除SIC规则（具有CW内取消），执行针对上行链路的调制和编码方案MCS分配，响应于所确定的PMI 和RI选择; 并且响应于用于由turbo SIC接收机检测的MCS分配，影响上行链路中的数据传输。

59. 发明授权

US08644180B2 MU-MIMO-OFDMA methods and systems for signaling multi-rank CQIs and precoders 有权
标题翻译： MU-MIMO-OFDMA方法和用于信令多级CQI和预编码器的系统
公开(公告)号：US08644180B2
公开(公告)日：2014-02-04
申请号：US13080403
申请日：2011-04-05
申请人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
发明人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sampath Rangarajan
IPC分类号： H04L12/26 , H04W4/00 , H04B7/02
CPC分类号： H04W24/08 , H04B7/0452 , H04B7/0465 , H04B7/0486 , H04W52/346 , H04W72/0406 , H04W72/085
摘要： 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 and an indication of a fraction of a transmit power at the base station that is applied to streams that are scheduled for transmission to a particular user. The method further includes determining one or more signal quality measures for the at least one sub-band based on at least one of the fraction or 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 addition, an indication of the one or more signal quality measures is transmitted to the base station in the method.
摘要翻译：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和基站处的发送功率的一小部分的指示，其被应用于被调度用于传输到特定用户的流。该方法还包括基于由基站对其进行调度的流的总数的分数或估计或上限中的至少一个来确定至少一个子带的一个或多个信号质量度量该至少一个子带。此外，在该方法中向基站发送一个或多个信号质量测量的指示。

60. 发明授权

US08599951B2 Feed-forward control signaling and decoding schemes 有权
公开(公告)号：US08599951B2
公开(公告)日：2013-12-03
申请号：US13115162
申请日：2011-05-25
申请人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
发明人： Mohammad A. Khojastepour , Narayan Prasad , Sampath Rangarajan
IPC分类号： H04B7/02 , H04L1/02
摘要： 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.

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