公开(公告)号：US20060039312A1

公开(公告)日：2006-02-23

申请号：US11248890

申请日：2005-10-11

申请人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Irina Medvedev

发明人： Jay Walton ,  John Ketchum ,  Mark Wallace ,  Irina Medvedev

IPC分类号： H04B7/204

CPC分类号： H04L5/0023 ,  H04L1/06 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0058 ,  H04L5/006

摘要： Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency “signatures” of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlink) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics). One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.

公开(公告)号：US20070116143A1

公开(公告)日：2007-05-24

申请号：US11345976

申请日：2006-02-01

申请人： Bjorn Bjerke ,  Irina Medvedev ,  John Ketchum ,  Mark Wallace ,  Jay Walton

发明人： Bjorn Bjerke ,  Irina Medvedev ,  John Ketchum ,  Mark Wallace ,  Jay Walton

IPC分类号： H04L23/02 ,  H04L1/02 ,  H03D1/00

CPC分类号： H04L27/2647 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/06 ,  H04L25/03171 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques for performing detection and decoding at a receiver are described. In one scheme, the receiver obtains R received symbol streams for M data streams transmitted by a transmitter, performs receiver spatial processing on the received symbols to obtain detected symbols, performs log-likelihood ratio (LLR) computation independently for each of D best data streams, and performs LLR computation jointly for the M−D remaining data streams, where M>D≧1 and M>1. The D best data streams may be selected based on SNR and/or other criteria. In another scheme, the receiver performs LLR computation independently for each of the D best data streams, performs LLR computation jointly for the M−D remaining data streams, and reduces the number of hypotheses to consider for the joint LLR computation by performing a search for candidate hypotheses using list sphere detection, Markov chain Monte Carlo, or some other search technique.

摘要翻译： 描述在接收机处执行检测和解码的技术。 在一种方案中，接收机获得用于由发射机发送的M个数据流的R个接收符号流，对接收到的符号执行接收机空间处理以获得检测符号，对于每个D个最佳数据流独立地执行对数似然比（LLR）计算 并且为MD剩余数据流共同执行LLR计算，其中M> D> = 1且M> 1。 可以基于SNR和/或其他标准来选择D个最佳数据流。 在另一方案中，接收机对于每个D最佳数据流独立地执行LLR计算，为MD剩余数据流共同执行LLR计算，并且通过执行候选假设的搜索来减少对于联合LLR计算考虑的假设的数量 使用列表球体检测，马尔科夫链蒙特卡罗或其他搜索技术。

公开(公告)号：US20050130694A1

公开(公告)日：2005-06-16

申请号：US11049319

申请日：2005-02-01

申请人： Irina Medvedev ,  Jay Walton ,  John Ketchum

发明人： Irina Medvedev ,  Jay Walton ,  John Ketchum

IPC分类号： H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04B7/00

CPC分类号： H04B7/0417 ,  H04B7/0619 ,  H04L1/0001 ,  H04L1/06 ,  H04W52/42

摘要： Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.

摘要翻译： 用于在无线多信道（例如，MIMO）通信系统中控制多个数据流的发射功率的技术。 在一种方法中，根据特定（例如，CCMI，CCMI-SC，MMSE或MMSE-SC）接收机处理技术最初处理多个接收到的符号流，以提供多个检测到的数据流。 估计检测到的数据流的检测后SNR，并且识别超过设定点的每个SNR。 该设定点可以对应于（1）实现最大允许频谱效率所需的SNR或（2）实现特定频谱效率所需的目标SNR。 确定与用于超过设定点的检测后SNR相关联的每个检测到的数据流的新（或调整的）发射功率并将其用于数据流。 为不同类型的具有不同特性的接收机处理技术提供不同的功率控制方案。

公开(公告)号：US20060116155A1

公开(公告)日：2006-06-01

申请号：US11330733

申请日：2006-01-11

申请人： Irina Medvedev ,  Jay Walton ,  John Ketchum

发明人： Irina Medvedev ,  Jay Walton ,  John Ketchum

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/346 ,  H04B7/0443 ,  H04W24/00 ,  H04W52/241 ,  H04W52/267 ,  H04W52/50 ,  H04W72/00

摘要： Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the “poorer” transmission channels without sacrificing the performance of the “better” transmission channels.

公开(公告)号：US20080056305A1

公开(公告)日：2008-03-06

申请号：US11751471

申请日：2007-05-21

申请人： Irina Medvedev ,  Jay Walton ,  Mark Wallace ,  Steven Howard

发明人： Irina Medvedev ,  Jay Walton ,  Mark Wallace ,  Steven Howard

IPC分类号： H04B3/10

CPC分类号： H04L27/0014 ,  H04L1/0045 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/061 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2662 ,  H04L2027/0053 ,  H04L2027/0067 ,  H04L2027/0087

摘要： Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

摘要翻译： 描述用于执行无线通信的相位校正的技术。 可以从正交频分复用（OFDM）和/或多输入多输出（MIMO）传输中获得接收到的导频符号和接收的数据符号。 基于接收到的导频符号获得第一相位信息。 基于接收到的数据符号获得第二相位信息。 基于第一和第二相位信息（直接和/或间接地）校正接收到的数据符号的相位。 例如，可以基于第一相位信息来校正接收到的数据符号的相位，可以对相位校正数据符号执行检测以获得估计的数据符号，可以基于估计的数据符号获得第二相位信息， 并且可以基于第二相位信息来校正估计数据符号的相位。 相位校正也可以以其他方式进行。

公开(公告)号：US20050094598A1

公开(公告)日：2005-05-05

申请号：US10985400

申请日：2004-11-10

申请人： Irina Medvedev ,  Jay Walton ,  Mark Wallace

发明人： Irina Medvedev ,  Jay Walton ,  Mark Wallace

IPC分类号： H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26 ,  H04Q7/00

CPC分类号： H04B7/0417 ,  H04B7/043 ,  H04B7/0439 ,  H04B7/0443 ,  H04B7/061 ,  H04B7/0626 ,  H04B7/0689 ,  H04B7/0691 ,  H04B7/0854 ,  H04L1/0002 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0046 ,  H04L5/006 ,  H04W52/42

摘要： Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a “beam-forming” transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a “multi-mode” transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

摘要翻译： 使用需要较少信道状态信息（CSI）的多个传输方案在多信道通信系统中在多个传输信道上传输数据的技术。 这些方案可以包括在被选择使用的每个发射天线上发送单个数据流的部分CSI传输方案以及将所有发射功率分配给具有最佳性能的单个传输信道的“波束形成”传输方案。 每个传输方案可以为特定范围的操作条件（或操作SNR）提供良好或接近最佳的性能。 然后，这些多个传输方案可以以分段方式组合以形成覆盖由MIMO系统支持的全部操作条件的“多模式”传输方案。 在任何给定时刻用于数据传输的具体传输方案将取决于系统在此刻经历的特定操作条件。

公开(公告)号：US20060050770A1

公开(公告)日：2006-03-09

申请号：US11042126

申请日：2005-01-24

申请人： Mark Wallace ,  Irina Medvedev ,  Jay Walton

发明人： Mark Wallace ,  Irina Medvedev ,  Jay Walton

IPC分类号： H04L1/02 ,  H04B1/707

CPC分类号： H04L25/0242 ,  H04B7/0669 ,  H04B7/068 ,  H04B7/0854 ,  H04L1/0606 ,  H04L1/0618 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0256 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2647 ,  H04L2025/03426

摘要： A receiving entity obtains received symbols for a data transmission having at least one data symbol stream sent with space-time transmit diversity (STTD). The receiving entity derives an overall channel response matrix in accordance with the STTD encoding scheme used for the data transmission, derives a spatial filter matrix based on the overall channel response matrix, and performs spatial matched filtering on a vector of received symbols for each 2-symbol interval to obtain a vector of detected symbols for the 2-symbol interval. The receiving entity may perform post-processing (e.g., conjugation) on the detected symbols if needed. Alternatively, the receiving entity derives a spatial filter matrix based on an effective channel response matrix, performs spatial matched filtering on the received symbols for each symbol period to obtain detected symbols for that symbol period, and combines multiple estimates obtained for each data symbol sent with STTD.

摘要翻译： 接收实体获得具有用空时传输分集（STTD）发送的至少一个数据符号流的数据传输的接收符号。 接收实体根据用于数据传输的STTD编码方案导出整体信道响应矩阵，基于整个信道响应矩阵导出空间滤波器矩阵，并且对每个2-信道的接收符号的向量执行空间匹配滤波， 符号间隔以获得用于2符号间隔的检测符号的向量。 如果需要，接收实体可以在检测到的符号上执行后处理（例如，共轭）。 或者，接收实体基于有效信道响应矩阵导出空间滤波器矩阵，对于每个符号周期对接收到的符号执行空间匹配滤波，以获得该符号周期的检测符号，并且将针对每个符号周期发送的每个数据符号获得的多个估计合并 STTD。

公开(公告)号：US20060256848A1

公开(公告)日：2006-11-16

申请号：US11128698

申请日：2005-05-12

申请人： Irina Medvedev ,  Jay Walton

发明人： Irina Medvedev ,  Jay Walton

IPC分类号： H04B17/00 ,  H03D1/04

CPC分类号： H04L1/0002 ,  H04B7/0413 ,  H04L1/0015 ,  Y02D50/10

摘要： For rate selection with margin sharing in a system with independent rate per stream, SNR estimates are obtained for multiple data streams. Rates are then selected for the data streams based on the SNR estimates and such that at least one data stream has negative SNR margin, each remaining data stream has a non-negative SNR margin, and the total SNR margin for all data streams is non-negative. For rate selection with margin sharing in a system with a vector-quantized rate set, SNR estimates are obtained for usable transmission channels. The total SNR margin is determined for each rate combination based on the SNR estimates for the transmission channels. Each rate combination is associated with a specific number of data streams to transmit, a specific rate for each data stream, and a specific overall throughput. The rate combination with the highest overall throughput and non-negative total SNR margin is selected for use.

摘要翻译： 对于具有每个流独立速率的系统中的边缘共享的速率选择，对于多个数据流获得SNR估计。 然后基于SNR估计对数据流选择速率，并且使得至少一个数据流具有负SNR余量，每个剩余数据流具有非负SNR余量，并且所有数据流的总SNR余量是非负的， 负。 对于具有向量量化速率集的系统中的边缘共享的速率选择，获得可用传输信道的SNR估计。 基于传输信道的SNR估计，为每个速率组合确定总SNR余量。 每个速率组合与要发送的特定数量的数据流，每个数据流的特定速率以及特定的总吞吐量相关联。 选择具有最高总吞吐量和非负总体SNR余量的速率组合使用。

公开(公告)号：US20060285605A1

公开(公告)日：2006-12-21

申请号：US11190106

申请日：2005-07-25

申请人： Jay Walton ,  Irina Medvedev

发明人： Jay Walton ,  Irina Medvedev

IPC分类号： H04L1/02

CPC分类号： H04L1/0009 ,  H04L1/0003 ,  H04L1/06 ,  Y02D50/10

摘要： Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.

公开(公告)号：US06862271B2

公开(公告)日：2005-03-01

申请号：US10085456

申请日：2002-02-26

申请人： Irina Medvedev ,  Jay Rod Walton ,  Mark Wallace

发明人： Irina Medvedev ,  Jay Rod Walton ,  Mark Wallace

IPC分类号： H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26 ,  H04Q7/00

CPC分类号： H04B7/0417 ,  H04B7/043 ,  H04B7/0439 ,  H04B7/0443 ,  H04B7/061 ,  H04B7/0626 ,  H04B7/0689 ,  H04B7/0691 ,  H04B7/0854 ,  H04L1/0002 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0046 ,  H04L5/006 ,  H04W52/42

摘要： Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a “beam-forming” transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a “multi-mode” transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.