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1. 发明授权

US09083404B2 Linear precoding in MIMO broadcast channel with arbitrary rank constraints 有权
标题翻译：具有任意秩约束的MIMO广播信道中的线性预编码
公开(公告)号：US09083404B2
公开(公告)日：2015-07-14
申请号：US13234652
申请日：2011-09-16
申请人： Mohammad A. Khojastepour , Mohammad A. Khajehnejad , Guosen Yue
发明人： Mohammad A. Khojastepour , Mohammad A. Khajehnejad , Guosen Yue
IPC分类号： H04B7/04
CPC分类号： H04B7/0486 , H04B7/0465
摘要： Methods and systems for transmission are shown that include iteratively generating an optimized precoder matrix and optimized linear filters for multiple receivers, where the optimized precoder matrix is based on a linear filter from a previous iteration and the optimized linear filters the multiple receivers are based on a precoder matrix from a previous iteration, precoding an input stream using the iteratively generated optimized precoder matrix to produce transmission streams for the multiple receivers, where at least one receiver has a plurality of associated transmission streams, and transmitting the transmission streams with multiple antennas to the receivers.
摘要翻译：示出了用于传输的方法和系统，其包括迭代地生成针对多个接收器的优化的预编码器矩阵和优化的线性滤波器，其中优化的预编码器矩阵基于来自先前迭代的线性滤波器，并且所述多个接收机基于预编码器矩阵，使用迭代生成的优化预编码器矩阵对输入流进行预编码，以产生多个接收机的传输流，其中至少一个接收机具有多个相关联的传输流，并且将具有多个天线的传输流发送到接收器。

2. 发明授权

US08718174B2 Multi-user multiple input multiple output wireless communications 有权
标题翻译：多用户多输入多输出无线通信
公开(公告)号：US08718174B2
公开(公告)日：2014-05-06
申请号：US13562738
申请日：2012-07-31
申请人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sam Path Rangarajan
发明人： Narayan Prasad , Guosen Yue , Mohammad A. Khojastepour , Meilong Jiang , Sam Path Rangarajan
IPC分类号： H04B7/02
CPC分类号： H04B7/0452 , H04J11/0046 , H04L5/0023 , H04L25/03331 , H04L27/0008 , H04L27/0012 , H04L27/34 , H04W72/042 , H04W72/12
摘要： A method implemented in a user equipment used in a multi-user multiple input multiple output (MU-MIMO) wireless communications system is disclosed. The method includes receiving from a base station an indication of a first modulation type for the user equipment, receiving a first data signal for the user equipment, receiving a second data signal for a co-scheduled user equipment, where a second modulation type for the co-scheduled user equipment is unknown to the user equipment, and deciding the second modulation type. Other methods, systems, and apparatuses also are disclosed.
摘要翻译：公开了一种在多用户多输入多输出（MU-MIMO）无线通信系统中使用的用户设备中实现的方法。该方法包括从基站接收用户设备的第一调制类型的指示，接收用户设备的第一数据信号，为共同调度的用户设备接收第二数据信号，其中第二调制类型为共同调度的用户设备对于用户设备是未知的，并且确定第二调制类型。还公开了其它方法，系统和装置。

3. 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。

4. 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.

5. 发明授权

US08315328B2 Methods to transmit and receive for low dimensions MIMO systems 有权
标题翻译：低维MIMO系统的发送和接收方法
公开(公告)号：US08315328B2
公开(公告)日：2012-11-20
申请号：US13112672
申请日：2011-05-20
申请人： Mohammad A. Khojastepour
发明人： Mohammad A. Khojastepour
IPC分类号： H04B7/02 , H04B7/10
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。

6. 发明申请

US20120257685A1 Codebook With Nested Structure 有权
公开(公告)号：US20120257685A1
公开(公告)日：2012-10-11
申请号：US13524269
申请日：2012-06-15
申请人： Mohammad A. Khojastepour , Narayan Prasad
发明人： Mohammad A. Khojastepour , Narayan Prasad
IPC分类号： H04L25/49 , H04B1/10 , H04B15/00 , H04B7/02
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.

7. 发明授权

US08275322B2 Rateless coding for multiuser interference relay channel 有权
标题翻译：无源编码多用户干扰中继通道
公开(公告)号：US08275322B2
公开(公告)日：2012-09-25
申请号：US12432232
申请日：2009-04-29
申请人： Mohammad A. Khojastepour , Xiaodong Wang
发明人： Mohammad A. Khojastepour , Xiaodong Wang
IPC分类号： H04B1/00
CPC分类号： H04B7/155 , H04B7/15521 , H04B7/15557
摘要： An interference relay channel (IRC) utilizes a single relay to assist communications between multiple source-destination links under the half-duplex (HD) constraint. It is assumed that each source has an independent message and its transmitted signal may cause interference at the other destinations. It is also assumed that each node only estimates its backward channels and has no knowledge of its forward channels as well as the other links. The role of the relay is to generate signals to cooperate with the intended signal and mitigate the interference at all destinations.
摘要翻译：干扰中继信道（IRC）利用单个中继来辅助半双工（HD）约束下的多个源 - 目的链路之间的通信。假设每个源具有独立的消息，并且其发送的信号可能在其他目的地造成干扰。还假设每个节点仅估计其反向信道，并且不知道其前向信道以及其他链路。继电器的作用是产生与预期信号配合的信号，并减轻所有目的地的干扰。

8. 发明申请

US20120236819A1 Method for Transmitting an Information Sequence 有权
公开(公告)号：US20120236819A1
公开(公告)日：2012-09-20
申请号：US13484355
申请日：2012-05-31
申请人： Mohammad A. Khojastepour
发明人： Mohammad A. Khojastepour
IPC分类号： H04W72/04 , H04W4/00
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.

9. 发明授权

US08265697B2 Restricted multi-rank precoding in multiple antenna systems 有权
标题翻译：多天线系统中的限制多级预编码
公开(公告)号：US08265697B2
公开(公告)日：2012-09-11
申请号：US13155700
申请日：2011-06-08
申请人： Mohammad A. Khojastepour
发明人： Mohammad A. Khojastepour
IPC分类号： H04M1/00
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：用于诸如多输入多输出（MIMO）无线下行链路用户设备（UE）的多天线系统的量化多级波束成形方案估计下行链路信道和发射功率并且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。

10. 发明授权

US08259842B2 Successive codebook and feedback in precoding systems 有权
标题翻译：预编码系统中的连续码本和反馈
公开(公告)号：US08259842B2
公开(公告)日：2012-09-04
申请号：US13112765
申请日：2011-05-20
申请人： Mohammad A. Khojastepour
发明人： Mohammad A. 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。

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