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。

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。

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。

公开(公告)号：US20080232501A1

公开(公告)日：2008-09-25

申请号：US11950702

申请日：2007-12-05

申请人： Mohammad Ali Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

发明人： Mohammad Ali Khojastepour ,  Xiaodong Wang ,  Mohammad Madihian

IPC分类号： 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。

公开(公告)号：US20070191066A1

公开(公告)日：2007-08-16

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 ,  H04M1/00 ,  H04B7/02

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。

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。

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。

公开(公告)号：US20080069261A1

公开(公告)日：2008-03-20

申请号：US11857251

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： H04L1/02

CPC分类号： H04L1/0631 ,  H04L5/023 ,  H04L25/0232 ,  H04L27/2649

摘要： In accordance with the invention, a method includes determining either the number of tones per chunk required to compute per-chunk order responsive to a sub-band bandwidth, a coherence bandwidth and number of chunks, or the number of chunks responsive to a sub-band bandwidth and a coherence bandwidth; determining an order for each chunk; and determining, for each chunk, QR decompositions for all its tones according to the determined order.

摘要翻译： 根据本发明，一种方法包括：响应于子带带宽，相干带宽和块数量，或响应于子带宽的块的数量来确定每个块所需的每个块所需的每个块的个数， 带宽和相干带宽; 确定每个块的顺序; 并且根据确定的顺序为每个块确定其所有音调的QR分解。

公开(公告)号：US08091006B2

公开(公告)日：2012-01-03

申请号：US11694241

申请日：2007-03-30

申请人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

发明人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

IPC分类号： H03M13/00

CPC分类号： H03M13/01 ,  H04L1/0631 ,  H04L1/0637

摘要： Methods and apparatus for designing spherical lattice codebooks for use in data transmission systems are provided. A spherical lattice codebook is constructed by determining the channel statistics of one or more channels, which can be accomplished by observing a sufficiently large set of channel realizations. After determining the channel statistics, an expression for the error probability of the decoder or expressions for bounds on the error probability and expressions for the corresponding gradients are determined. The gradient is then used in an optimization technique to produce a spherical lattice codebook which is subsequently used for transmission.

摘要翻译： 提供了用于数据传输系统中使用的球面晶格码本的方法和装置。 通过确定一个或多个信道的信道统计量来构造球面晶格码本，其可以通过观察足够大的信道实现集来实现。 在确定信道统计后，确定解码器的错误概率或对于对应梯度的误差概率和表达式的边界的表达式的表达式。 然后将梯度用于优化技术中以产生随后用于传输的球形晶格码本。

公开(公告)号：US08036601B2

公开(公告)日：2011-10-11

申请号：US12047514

申请日：2008-03-13

申请人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

发明人： Narayan Prasad ,  Xiaodong Wang ,  Mohammad Madihian

IPC分类号： H04B1/00 ,  H04B15/00

CPC分类号： H04B1/71055

摘要： A method for filtering in a wireless downlink channel, where all dominant transmitting sources use inner codes from a particular set, includes the steps of estimating a channel matrix seen from a desired transmitter source in response to a pilot or preamble signal; converting the estimated channel matrix into an effective channel matrix responsive to the inner code of the desired transmitting source; estimating a covariance matrix of noise plus interference in a linear model whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitting source inherits the structure of its inner code; computing a signal-to-noise-interference-ratio SINR responsive to the covariance matrix and the effective channel matrix corresponding to the desired source; and feeding back the computed SINR to the transmitter source.

摘要翻译： 一种在无线下行链路信道中进行滤波的方法，其中所有主要发射源使用来自特定集合的内部码包括以下步骤：响应于导频或前导信号估计从期望的发射机源看到的信道矩阵; 响应于期望的发送源的内部码，将估计的信道矩阵转换成有效信道矩阵; 在线性模型中估计噪声加干扰的协方差矩阵，其输出等于接收到的观测值，并且其中对应于每个主导发射源的有效信道矩阵继承其内部码的结构; 响应于协方差矩阵和对应于期望源的有效信道矩阵来计算信噪比干扰比SINR; 并将所计算的SINR反馈到发射机源。