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1. 发明授权

US08660077B2 Method and systems for conveying scheduling information of overlapping co-scheduled users in an OFDMA-MU-MIMO system 有权
标题翻译：用于在OFDMA-MU-MIMO系统中传送重叠共同调度用户的调度信息的方法和系统
公开(公告)号：US08660077B2
公开(公告)日：2014-02-25
申请号：US13296394
申请日：2011-11-15
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： H04W4/00 , H04W28/04 , H04W72/04
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： 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.
摘要翻译：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。

2. 发明授权

US08532051B2 Method and systems for conveying scheduling information of overlapping co-scheduled users in an OFDMA-MU-MIMO system 有权
标题翻译：用于在OFDMA-MU-MIMO系统中传送重叠共同调度用户的调度信息的方法和系统
公开(公告)号：US08532051B2
公开(公告)日：2013-09-10
申请号：US13296387
申请日：2011-11-15
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： H04L5/22 , H04W72/04 , H04L5/00
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： 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.
摘要翻译：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。

3. 发明授权

US08255778B2 Hybrid ARQ transmission method with effective channel matrix and decision statistics resetting 有权
标题翻译：具有有效信道矩阵和决策统计复位的混合ARQ传输方法
公开(公告)号：US08255778B2
公开(公告)日：2012-08-28
申请号：US12435249
申请日：2009-05-04
申请人： Narayan Prasad , Xiaodong Wang
发明人： Narayan Prasad , Xiaodong Wang
IPC分类号： H03M13/15 , H03M13/17 , H03M13/45
CPC分类号： H04L1/1845 , H03M13/09 , H03M13/6306 , H03M13/6337
摘要： 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.
摘要翻译：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。

4. 发明授权

US08174959B2 Auction based resource allocation in wireless systems 有权
标题翻译：无线系统中基于拍卖的资源分配
公开(公告)号：US08174959B2
公开(公告)日：2012-05-08
申请号：US12399769
申请日：2009-03-06
申请人： Kai Yang , Narayan Prasad , Xiaodong Wang
发明人： Kai Yang , Narayan Prasad , Xiaodong Wang
IPC分类号： H04J11/00 , H04J3/16
CPC分类号： H04L5/0007 , H04L5/0032 , H04L5/0037 , H04L5/0046 , H04W52/243 , H04W52/262 , H04W52/267 , H04W52/346 , H04W72/1257
摘要： 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.
摘要翻译：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。

5. 发明授权

US08014460B2 Method for multiple-input-multiple-output system demodulation 有权
标题翻译：多输入多输出系统解调方法
公开(公告)号：US08014460B2
公开(公告)日：2011-09-06
申请号：US11613407
申请日：2006-12-20
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： H04L25/03203 , H04L25/0204
摘要： 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.
摘要翻译：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。

6. 发明授权

US07949318B2 Multi-rank beamforming precoding apparatus and method 有权
标题翻译：多级波束成形预编码装置及方法
公开(公告)号：US07949318B2
公开(公告)日：2011-05-24
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。

7. 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。

8. 发明申请

US20090262872A1 RECEIVER WITH PREFILTERING FOR DISCRETE FOURIER TRANSFORM-SPREAD-ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (DFT-S-OFDM) BASED SYSTEMS 有权
标题翻译：用于离散傅里叶变换扩展正交频分多址（DFT-S-OFDM）的系统的接收器
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。

9. 发明申请

US20080188190A1 MULTI-RANK BEAMFORMING PRECODING APPARATUS AND METHOD 有权
标题翻译：多级波束形成预处理装置和方法
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。

10. 发明申请

US20080069262A1 Enhanced Successive Interference Cancellation (SIC) Receiver for Multiple-Input Multiple-Output (MIMO) Systems 有权
标题翻译：用于多输入多输出（MIMO）系统的增强型连续干扰消除（SIC）接收机
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。

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