公开(公告)号：US07076263B2

公开(公告)日：2006-07-11

申请号：US10079970

申请日：2002-02-19

申请人： Irina Medvedev ,  Jay R. Walton ,  John W. Ketchum

发明人： Irina Medvedev ,  Jay R. Walton ,  John W. Ketchum

IPC分类号： 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.

公开(公告)号：US07221956B2

公开(公告)日：2007-05-22

申请号：US11049319

申请日：2005-02-01

申请人： Irina Medvedev ,  Jay R. Walton ,  John W. Ketchum

发明人： Irina Medvedev ,  Jay R. Walton ,  John W. Ketchum

IPC分类号： 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：US08467466B2

公开(公告)日：2013-06-18

申请号：US11345976

申请日：2006-02-01

申请人： Bjorn Bjerke ,  Irina Medvedev ,  John W. Ketchum ,  Mark S. Wallace ,  Jay Rodney Walton

发明人： Bjorn Bjerke ,  Irina Medvedev ,  John W. Ketchum ,  Mark S. Wallace ,  Jay Rodney Walton

IPC分类号： H04L23/02 ,  H04L5/12

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：US08406200B2

公开(公告)日：2013-03-26

申请号：US12509941

申请日：2009-07-27

申请人： J. Rodney Walton ,  John W. Ketchum ,  Mark S. Wallace ,  Irina Medvedev

发明人： J. Rodney Walton ,  John W. Ketchum ,  Mark S. Wallace ,  Irina Medvedev

IPC分类号： H04Q7/00

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.

摘要翻译： 基于终端的空间和/或频率签名，在MIMO-OFDM系统中在下行链路和/或上行链路上安排终端进行数据传输的技术。 调度器形成用于多个频带中的每一个的可能（下行链路或上行链路）数据传输的一个或多个终端集合。 每个假设可以进一步形成一个或多个子假设，每个子假设对应于（1）假设（对于下行链路）的发射天线到终端的特定分配，或者（2）特定顺序 用于处理来自终端（用于上行链路）的上行链路数据传输。 然后评估每个子假设的性能（例如，基于一个或多个性能度量）。 然后根据评估的性能为每个频带选择一个子假设，然后调度每个选择的子假设中的一个或多个终端用于相应频带上的数据传输。

公开(公告)号：US20100020757A1

公开(公告)日：2010-01-28

申请号：US12509941

申请日：2009-07-27

申请人： J. Rodney Walton ,  John W. Ketchum ,  Mark S. Wallace ,  Irina Medvedev

发明人： J. Rodney Walton ,  John W. Ketchum ,  Mark S. Wallace ,  Irina Medvedev

IPC分类号： H04W72/00 ,  H04L1/02

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.

摘要翻译： 基于终端的空间和/或频率“签名”，在MIMO-OFDM系统的下行链路和/或上行链路上安排终端进行数据传输的技术。 调度器形成用于多个频带中的每一个的可能（下行链路或上行链路）数据传输的一个或多个终端集合。 每个假设可以进一步形成一个或多个子假设，每个子假设对应于（1）假设（对于下行链路）的发射天线到终端的特定分配，或者（2）特定顺序 用于处理来自终端（用于上行链路）的上行链路数据传输。 然后评估每个子假设的性能（例如，基于一个或多个性能度量）。 然后根据评估的性能为每个频带选择一个子假设，然后调度每个选择的子假设中的一个或多个终端用于相应频段上的数据传输。

公开(公告)号：US07020110B2

公开(公告)日：2006-03-28

申请号：US10042529

申请日：2002-01-08

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

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

IPC分类号： H04Q7/00

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：US08462653B2

公开(公告)日：2013-06-11

申请号：US12778911

申请日：2010-05-12

申请人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

发明人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

IPC分类号： H04L12/26

CPC分类号： H04W24/02 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/0019 ,  H04L1/0025 ,  H04L1/06 ,  H04L1/20

摘要： Techniques to select a suitable transmission mode for a data transmission in a multi channel communication system with multiple spatial channels having varying SNRs are presented in this disclosure. For certain embodiments, a closed-loop technique may be applied, in which back-off factors used to calculate an effective SNR value fed back to a transmitter are adjusted. An open-loop rate control scheme is also presented in which a transmitter may select a data rate and number of streams based on whether transmitted packets are received in error at a receiver.

摘要翻译： 在本公开中提出了在具有变化的SNR的多个空间信道的多通道通信系统中选择用于数据传输的合适传输模式的技术。 对于某些实施例，可以应用闭环技术，其中调整用于计算反馈到发射机的有效SNR值的回退因子。 还提出了一种开环速率控制方案，其中发射机可以基于在接收机处是否发送的分组被错误地接收来选择数据速率和数量的数据流。

公开(公告)号：US08619620B2

公开(公告)日：2013-12-31

申请号：US12211811

申请日：2008-09-16

申请人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

发明人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

IPC分类号： G06F11/00 ,  H04B7/005

CPC分类号： H04W24/02 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/0019 ,  H04L1/0025 ,  H04L1/06 ,  H04L1/20

摘要： Techniques to select a suitable transmission mode for a data transmission in a multi channel communication system with multiple spatial channels having varying SNRs are presented in this disclosure. For certain embodiments, a closed-loop technique may be applied, in which back-off factors used to calculate an effective SNR value fed back to a transmitter are adjusted. An open-loop rate control scheme is also presented in which a transmitter may select a data rate and number of streams based on whether transmitted packets are received in error at a receiver.

摘要翻译： 在本公开中提出了在具有变化的SNR的多个空间信道的多通道通信系统中选择用于数据传输的合适传输模式的技术。 对于某些实施例，可以应用闭环技术，其中调整用于计算反馈到发射机的有效SNR值的回退因子。 还提出了一种开环速率控制方案，其中发射机可以基于在接收机处是否发送的分组被错误地接收来选择数据速率和数量的数据流。

公开(公告)号：US20100296407A1

公开(公告)日：2010-11-25

申请号：US12778911

申请日：2010-05-12

申请人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

发明人： Irina Medvedev ,  John W. Ketchum ,  J. Rodney Walton

IPC分类号： H04L12/26

CPC分类号： H04W24/02 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/0019 ,  H04L1/0025 ,  H04L1/06 ,  H04L1/20

摘要： Techniques to select a suitable transmission mode for a data transmission in a multi channel communication system with multiple spatial channels having varying SNRs are presented in this disclosure. For certain embodiments, a closed-loop technique may be applied, in which back-off factors used to calculate an effective SNR value fed back to a transmitter are adjusted. An open-loop rate control scheme is also presented in which a transmitter may select a data rate and number of streams based on whether transmitted packets are received in error at a receiver.

摘要翻译： 在本公开中提出了在具有变化的SNR的多个空间信道的多通道通信系统中选择用于数据传输的合适传输模式的技术。 对于某些实施例，可以应用闭环技术，其中调整用于计算反馈到发射机的有效SNR值的回退因子。 还提出了一种开环速率控制方案，其中发射机可以基于在接收机处是否发送的分组被错误地接收来选择数据速率和数量的数据流。

公开(公告)号：US07020482B2

公开(公告)日：2006-03-28

申请号：US10056275

申请日：2002-01-23

申请人： Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

发明人： Irina Medvedev ,  Jay Rod Walton ,  John W. Ketchum

IPC分类号： H04B7/00

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.