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1. 发明授权

US08391409B2 Method for transmitting an information sequence 有权
标题翻译：发送信息序列的方法
公开(公告)号：US08391409B2
公开(公告)日：2013-03-05
申请号：US13297615
申请日：2011-11-16
申请人： Mohammad Ali Khojastepour
发明人： Mohammad Ali Khojastepour
IPC分类号： H04L27/00
CPC分类号： H04B7/0632 , H04B7/043 , H04B7/0456 , H04B7/0478 , H04B7/0617 , H04B7/0639
摘要： Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.
摘要翻译：公开了用于在一组并行通道上设计预编码器的连续多级波束形成策略（例如，连续预编码策略）的方法和装置。连续波束成形被应用于窄带信道模型，并且还被应用于单个波束成形向量（例如，递归波束成形）的更精细量化。第一实施例提供了高复杂度的最佳方法。替代实施例提供连续的波束成形用于具有中等复杂度的近最优预编码选择。还提供了一种用于预编码器选择的低复杂度方法，其中确定用于该组并行信道的信道代表性矩阵，并且应用所计算的信道代表上的连续波束成形。

2. 发明授权

US08270918B2 Precoded data receiver 有权
标题翻译：预编码数据接收器
公开(公告)号：US08270918B2
公开(公告)日：2012-09-18
申请号：US13267298
申请日：2011-10-06
申请人： Mohammad Ali Khojastepour , Narayan Prasad
发明人： Mohammad Ali Khojastepour , Narayan Prasad
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。

3. 发明授权

US07917176B2 Structured codebook and successive beamforming for multiple-antenna systems 有权
标题翻译：结构化码本和多天线系统的连续波束成形
公开(公告)号：US07917176B2
公开(公告)日：2011-03-29
申请号：US11674330
申请日：2007-02-13
申请人： Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Madihian
发明人： Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Madihian
IPC分类号： H04B1/02
CPC分类号： H04B7/0617 , H04B7/04 , H04B7/0408 , H04B7/0413 , H04B7/0456 , H04B7/046 , H04B7/0486 , H04W52/42 , H04W88/02 , H04W88/08
摘要： A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.
摘要翻译：用于多天线系统的量化多级波束成形方案，例如多输入多输出（MIMO）无线下行链路。用户设备（UE）估计下行链路信道和发射功率，并确定等级和功率分配。然后由UE使用连续的波束形成来确定量化的波束形成矩阵。 UE还确定其反馈到无线下行链路基站的信道质量指数（CQI）以及量化波束形成矩阵的索引。基站使用CQI信息来选择用于下行链路传输的调度的UE和从所选择的UE接收的量化的波束成形矩阵索引来波束形成到UE的下行链路传输。给定了有限的反馈信道和UE的计算复杂度的限制，基站开销被最小化，同时提供接近最佳的性能。

4. 发明申请

US20110007757A1 DETERMINISTIC ROTATIONAL CODING 有权
标题翻译：决定性旋转编码
公开(公告)号：US20110007757A1
公开(公告)日：2011-01-13
申请号：US12719445
申请日：2010-03-08
申请人： Mohammad Ali Khojastepour , Alireza Keshavarz-haddad
发明人： Mohammad Ali Khojastepour , Alireza Keshavarz-haddad
IPC分类号： H04J13/00
CPC分类号： H04L1/0076
摘要： A system and method for implementing a network encoding scheme includes buffering a signal in quantized form at a node of a network and permuting the signal into a particular order of code blocks. The code blocks are rotated using at least one key which has been assigned to the node, wherein the at least one assigned key is a value which is used to control the amount of rotation. The rotated code blocks are then combined to generate a combined signal. The combined signal is permuted back to generate at least one output signal.
摘要翻译：用于实现网络编码方案的系统和方法包括以网络的节点将量化形式的信号进行缓冲，并将信号置换成特定顺序的码块。使用已经分配给节点的至少一个密钥来循环代码块，其中至少一个分配的密钥是用于控制旋转量的值。然后组合旋转的码块以产生组合信号。将组合的信号置换回产生至少一个输出信号。

5. 发明授权

US07839945B2 Static and differential precoding codebook for MIMO systems 有权
标题翻译：用于MIMO系统的静态和差分预编码码本
公开(公告)号：US07839945B2
公开(公告)日：2010-11-23
申请号：US11950702
申请日：2007-12-05
申请人： Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Mahidian
发明人： Mohammad Ali Khojastepour , Xiaodong Wang , Mohammad Mahidian
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04B7/0417 , H04B7/0478 , H04B7/0639 , H04B7/0641
摘要： Systems and methods are disclosed to generate a codebook for channel state information by generating a random codebook; partitioning channel state information into a set of nearest neighbors for each codebook entry based on a distance metric; and updating the codebook by finding a centroid for each partition.
摘要翻译：公开了通过生成随机码本来生成用于信道状态信息的码本的系统和方法; 基于距离度量将信道状态信息划分成用于每个码本条目的一组最近邻居; 并通过为每个分区找到一个质心来更新码本。

6. 发明授权

US08750149B2 Method for transmitting an information sequence 有权
标题翻译：发送信息序列的方法
公开(公告)号：US08750149B2
公开(公告)日：2014-06-10
申请号：US13297627
申请日：2011-11-16
申请人： Mohammad Ali Khojastepour
发明人： Mohammad Ali Khojastepour
IPC分类号： H04L1/14
CPC分类号： H04B7/0632 , H04B7/043 , H04B7/0456 , H04B7/0478 , H04B7/0617 , H04B7/0639
摘要： Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.
摘要翻译：公开了用于在一组并行通道上设计预编码器的连续多级波束形成策略（例如，连续预编码策略）的方法和装置。连续波束成形被应用于窄带信道模型，并且还被应用于单个波束成形向量（例如，递归波束成形）的更精细量化。第一实施例提供了高复杂度的最佳方法。替代实施例提供连续的波束成形用于具有中等复杂度的近最优预编码选择。还提供了一种用于预编码器选择的低复杂度方法，其中确定用于该组并行信道的信道代表性矩阵，并且应用所计算的信道代表上的连续波束成形。

7. 发明授权

US08743989B2 Method for transmitting an information sequence 有权
公开(公告)号：US08743989B2
公开(公告)日：2014-06-03
申请号：US13524258
申请日：2012-06-15
申请人： Mohammad Ali Khojastepour
发明人： Mohammad Ali Khojastepour
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04B7/0632 , H04B7/043 , H04B7/0456 , H04B7/0478 , H04B7/0617 , H04B7/0639
摘要： Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.

8. 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。

9. 发明授权

US08537929B2 Multicast coding methods and systems 有权
标题翻译：组播编码方法和系统
公开(公告)号：US08537929B2
公开(公告)日：2013-09-17
申请号：US13004564
申请日：2011-01-11
申请人： Mohammad Ali Khojastepour , Alireza Keshavarz-haddad
发明人： Mohammad Ali Khojastepour , Alireza Keshavarz-haddad
IPC分类号： H04L27/00
CPC分类号： H04L25/03343
摘要： Methods and systems for coding multicast information signals are disclosed. Signal transformations imposed by communication links with a plurality of receivers that are grouped into subsets of receivers can be determined. In addition, a coding design can be generated by employing dimension parameters that are related to achievable capacity rates of the subsets of receivers and are determined by constraining a sum of the dimension parameters to be less than or equal to a dimension of a union of subspaces of signal values that are receivable by the receivers. Output signals can be generated by applying the coding design to multicast information to compensate for the signal transformations. Further, the output signals can be transmitted to the plurality of receivers.
摘要翻译：公开了用于编码组播信息信号的方法和系统。可以确定由与接收机的子集分组的多个接收机的通信链路施加的信号变换。另外，可以通过使用与接收机的子集的可实现的容量率相关的维度参数来生成编码设计，并且通过将维度参数的和约束为小于或等于子空间的维数的维度来确定可接收的信号值。可以通过将编码设计应用到多播信息来补偿信号变换来产生输出信号。此外，可以将输出信号发送到多个接收器。

10. 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。

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