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1. 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。

2. 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。

3. 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。

4. 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。

5. 发明申请

US20130094453A1 MULTI-RESOLUTION PRECODING CODEBOOK 有权
公开(公告)号：US20130094453A1
公开(公告)日：2013-04-18
申请号：US13439301
申请日：2012-04-04
申请人： Mohammad Ali Khojastepour , Xiaodong Wang
发明人： Mohammad Ali Khojastepour , Xiaodong Wang
IPC分类号： H04B7/04 , H04W72/04
CPC分类号： H04B7/0456 , H04B7/0478 , H04B7/0639 , H04B7/0647 , H04L5/0023 , H04L25/0202 , H04L25/03343 , H04L25/03936 , H04L27/2601 , H04L2025/03426 , H04L2025/03808 , H04W72/04
摘要： Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations.

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

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。

8. 发明授权

US09055561B2 MU-MIMO-OFDMA systems and methods for servicing overlapping co-scheduled users 有权
标题翻译： MU-MIMO-OFDMA系统和用于服务重叠的共同调度用户的方法
公开(公告)号：US09055561B2
公开(公告)日：2015-06-09
申请号：US12642126
申请日：2009-12-18
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： H04W72/12 , H04W72/04 , H04L1/20 , H04W28/04 , H04L5/00 , H04B7/04 , H04L25/02 , H04L1/00 , H04W8/26
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. 发明申请

US20130230116A1 MULTI-RESOLUTION PRECODING CODEBOOK 审中-公开
公开(公告)号：US20130230116A1
公开(公告)日：2013-09-05
申请号：US13548268
申请日：2012-07-13
申请人： Mohammad Ali Khojastepour , Xiaodong Wang
发明人： Mohammad Ali Khojastepour , Xiaodong Wang
IPC分类号： H04L25/03
CPC分类号： H04B7/0456 , H04B7/0478 , H04B7/0639 , H04B7/0647 , H04L5/0023 , H04L25/0202 , H04L25/03343 , H04L25/03936 , H04L27/2601 , H04L2025/03426 , H04L2025/03808 , H04W72/04
摘要： Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations.

10. 发明申请

US20120281662A1 Scheduling Information of Overlapping Co-Scheduled Users in an OFDMA-MU-MIMO System 有权
标题翻译： OFDMA-MU-MIMO系统中重叠共同调度用户的调度信息
公开(公告)号：US20120281662A1
公开(公告)日：2012-11-08
申请号：US13550099
申请日：2012-07-16
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： H04W72/08 , H04W72/12
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： 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.
摘要翻译：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。

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