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：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：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。

公开(公告)号：US08031798B2

公开(公告)日：2011-10-04

申请号：US12047544

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： H04B15/00

CPC分类号： H04W72/082 ,  H04B7/0854 ,  H04B17/24 ,  H04B17/336 ,  H04L1/0026 ,  H04L1/0631 ,  H04L1/0668 ,  H04L25/03057 ,  H04L2025/03414 ,  H04L2025/0349 ,  H04W4/06 ,  H04W24/00 ,  H04W84/042

摘要： A method for decoding and rate assignment in a wireless channel, where all dominant transmitter sources use inner codes from a particular set, comprising the steps of: i) estimating channel matrices seen from all dominant transmitter sources in response to a pilot or preamble signal transmitted by each such source; ii) converting each estimated channel matrix into an effective channel matrix responsive to the inner code of the corresponding transmitter source; iii) obtaining the received observations in a linear equivalent form (linear model) whose output is an equivalent of the received observations and in which the effective channel matrix corresponding to each dominant transmitter source inherits the structure of its inner code; iv) processing the transmitter sources according to the specified (or pre-determined) order of decoding; v) for each transmitter source, assuming perfect cancellation of signals of preceding transmitter sources; vi) computing a signal-to-interference-noise-ratio SINR responsive to the effective channel matrix of the transmitter source and the covariance matrix of the noise plus signals from remaining transmitter sources; and vii) feeding back all computed SINRs to respective transmitter sources.

摘要翻译： 一种用于在无线信道中解码和速率分配的方法，其中所有主要发射机源使用来自特定集合的内部码，包括以下步骤：i）响应于传输的导频或前导信号估计从所有主要发射机源看到的信道矩阵 由每个这样的来源; ii）响应于对应的发射机源的内部码，将每个估计的信道矩阵转换成有效信道矩阵; iii）以线性等效形式（线性模型）获得接收到的观测值，其输出等于所接收的观测值，并且其中对应于每个主要发射机源的有效信道矩阵继承其内部码的结构; iv）根据指定（或预定）解码顺序处理发射机源; v）对于每个发射机源，假设完全取消先前发射机的信号; vi）响应于发射机源的有效信道矩阵和来自剩余发射机源的噪声加信号的协方差矩阵来计算信噪比SINR; 和vii）将所有计算的SINR反馈到相应的发射机源。

公开(公告)号：US08098631B2

公开(公告)日：2012-01-17

申请号：US12047555

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： H04W4/00

CPC分类号： H04W88/06 ,  H04W4/06 ,  H04W24/00 ,  H04W84/042

摘要： The invention is a method directed to group MMSE-DFD with rate (SINR) feedback and without pre-determined decoding order for reception on a cellular downlink. The method includes initializing channel matrix estimates and inner codes of all co-channel transmitter sources in a wireless network. Each channel matrix estimate is converted into an effective channel matrix responsive to the inner code of the corresponding transmitter source; The channel estimates or the inner codes or the modulation and coding schemes are not known for some of the transmitter sources whose transmitted signals are consequently treated as interference and deemed un-decodable.

摘要翻译： 本发明是一种针对具有速率（SINR）反馈的组MMSE-DFD并且在蜂窝下行链路上没有用于接收的预定解码顺序的方法。 该方法包括在无线网络中初始化信道矩阵估计和所有同信道发射机源的内部码。 响应于相应的发射机源的内部码，每个信道矩阵估计被转换成有效的信道矩阵; 信道估计或内码或调制和编码方案对于其发射信号因此被视为干扰并被认为是不可解码的一些发射机源是未知的。

公开(公告)号：US08023581B2

公开(公告)日：2011-09-20

申请号：US11857269

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： H04L23/02 ,  H04L27/06

CPC分类号： H04L1/0054 ,  H04L25/03203 ,  H04L25/03286 ,  H04L25/03305

摘要： A method includes the steps of i) listing out all possibilities for a first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each of the first symbol listed out, iii) evaluating a metric for each of the first symbol and second symbol pair, iv) listing out all possibilities for second symbol, v) determining a first symbol for each choice of the second symbol listed out, vi) evaluating a metric for each of the second symbol and first symbol pair, vii) determining an exact maximum log likelihood ratio for all bits using the metrics, and viii) decoding codeword(s) in the two stream signal using the determined exact maximum log likelihood ratio for all bits.

摘要翻译： 一种方法包括以下步骤：i）列出两个流信号的第一符号的所有可能性; ii）确定所列出的第一符号中的每一个的两个流信号的第二符号，iii）评估第一符号和第二符号对中的每一个的度量，iv）列出第二符号的所有可能性，v）确定 vi）对所述第二符号和第一符号对中的每个符号对的每一个的度量进行评估，vii）使用所述度量确定所有比特的精确最大对数似然比，以及viii）解码码字（ s）在两个流信号中，使用所确定的所有比特的精确最大对数似然比。