公开(公告)号：US20060146953A1

公开(公告)日：2006-07-06

申请号：US11075233

申请日：2005-03-08

申请人： Balaji Raghothaman ,  Jianzhong Zhang ,  Yan Wang ,  Marko Lampinen

发明人： Balaji Raghothaman ,  Jianzhong Zhang ,  Yan Wang ,  Marko Lampinen

IPC分类号： H04B7/02

CPC分类号： H04B7/0413 ,  H04B7/0854

摘要： An approach for determining antenna weights in a multiple antenna communication system is provided. The approach jointly optimizes the transmitter weights and the receiver filter. A filter of a receiver (e.g., Linear Minimum Mean Square Error (LMMSE)) is optimized using initial weight values of the transmit antennas. The cost function, which is a mean-squared of a difference between a transmitted signal and an estimated signal, is then modified according to the optimized receiver filter. A transmit filter is then optimized according to the modified cost function. The above approach advantageously can obtain antenna weights when the condition of separability of paths does not exist.

摘要翻译： 提供了一种用于确定多天线通信系统中的天线权重的方法。 该方法联合优化发射机权重和接收机滤波器。 使用发射天线的初始权重值来优化接收机的滤波器（例如，线性最小均方误差（LMMSE））。 然后根据优化的接收机滤波器修改作为发送信号和估计信号之间的差的均方的成本函数。 然后根据修改的成本函数优化发送过滤器。 当不存在路径的可分离性条件时，上述方法有利地可以获得天线权重。

公开(公告)号：US20060013328A1

公开(公告)日：2006-01-19

申请号：US10892833

申请日：2004-07-15

申请人： Jianzhong Zhang ,  Balaji Raghothaman ,  Yan Wang ,  Giridhar Mandyam

发明人： Jianzhong Zhang ,  Balaji Raghothaman ,  Yan Wang ,  Giridhar Mandyam

IPC分类号： H04B7/02 ,  H04L1/02 ,  H04B1/707

CPC分类号： H04L1/0656 ,  H04B1/7105 ,  H04B1/71055 ,  H04L1/0026 ,  H04L1/20 ,  H04L2025/03426 ,  H04L2025/03617

摘要： In a jointly encoded (JE), spread spectrum communication MIMO system where a demultiplexed packet is transmitted over multiple streams, two versions of a single channel quality indicator (CQI) is disclosed: generalized SNR or constrained mutual information CMI between the transmitted and received chip vectors. In the receiver, the CMI is constrained so that filtering is suboptimal. The filter bank is preferably LMMSE or MVDR filters that convert the multi-path channel into a single path channel so that joint sequence detection is unnecessary. Detection is instead by a per-Walsh code architecture, wherein a plurality of Walsh-code specific detectors in parallel detect bits or symbols from the single-channel chips after downconverting chip to symbols. Link to system mapping is realizable using the disclosed CQI for a JE MIMO system in that the CQI or related information is returned to the transmitter, which adapts coding rate and/or modulation for the channel as represented by the CQI.

摘要翻译： 在通过多个流传输解复用的分组的扩频通信MIMO系统中，公开了单个信道质量指示符（CQI）的两个版本：发射和接收的芯片之间的广义SNR或受限互相信息CMI 向量 在接收机中，CMI被约束，使得过滤不是最佳的。 滤波器组优选地将多路径信道转换成单路径信道的LMMSE或MVDR滤波器，使得不需要联合序列检测。 检测是逐个沃尔什码代码架构，其中多个沃尔什码专用检测器在将芯片下变频到符号之后并行地检测来自单通道芯片的位或符号。 使用所公开的用于JE MIMO系统的CQI可实现与系统映射的链接，因为CQI或相关信息被返回给发射机，其适配由CQI表示的信道的编码率和/或调制。

公开(公告)号：US07606319B2

公开(公告)日：2009-10-20

申请号：US10892833

申请日：2004-07-15

申请人： Jianzhong Zhang ,  Balaji Raghothaman ,  Yan Wang ,  Giridhar Mandyam

发明人： Jianzhong Zhang ,  Balaji Raghothaman ,  Yan Wang ,  Giridhar Mandyam

IPC分类号： H04B7/02

CPC分类号： H04L1/0656 ,  H04B1/7105 ,  H04B1/71055 ,  H04L1/0026 ,  H04L1/20 ,  H04L2025/03426 ,  H04L2025/03617

摘要： In a JE, spread spectrum communication MIMO system where a demultiplexed packet is transmitted over multiple streams, two versions of a single CQI are disclosed: generalized SNR or constrained mutual information CMI between the transmitted and received chip vectors. In the receiver, the CMI is constrained so that filtering is suboptimal. The filter bank is preferably LMMSE or MVDR filters that convert the multi-path channel into a single path channel so that joint sequence detection is unnecessary. Detection is by a per-Walsh code architecture, wherein a plurality of Walsh-code specific detectors in parallel detect bits or symbols from the single-channel chips after downconverting chip to symbols. Link to system mapping is realizable using the disclosed CQI for a JE MIMO system in that the CQI or related information is returned to the transmitter, which adapts coding rate and/or modulation for the channel as represented by the CQI.

摘要翻译： 在扩频通信MIMO系统中，通过多个流传输解复用分组的扩频通信MIMO系统，公开了单个CQI的两个版本：发送和接收的码片向量之间的广义SNR或受限互相信息CMI。 在接收机中，CMI被约束，使得过滤不是最佳的。 滤波器组优选地将多路径信道转换成单路径信道的LMMSE或MVDR滤波器，使得不需要联合序列检测。 检测是通过沃尔什码结构进行的，其中多个沃尔什码专用检测器在将芯片下变频到符号之后并行地检测来自单通道芯片的位或符号。 使用所公开的用于JE MIMO系统的CQI可实现与系统映射的链接，因为CQI或相关信息被返回给发射机，其适配由CQI表示的信道的编码率和/或调制。

公开(公告)号：US20050111376A1

公开(公告)日：2005-05-26

申请号：US10718837

申请日：2003-11-21

申请人： Balaji Raghothaman ,  Jianzhong Zhang

发明人： Balaji Raghothaman ,  Jianzhong Zhang

IPC分类号： H04B7/00 ,  H04B7/04 ,  H04B7/06 ,  H04L20060101

CPC分类号： H04B7/0417 ,  H04B7/0443 ,  H04B7/0465 ,  H04B7/0632 ,  H04B7/0669 ,  H04B7/0697 ,  H04L1/0002 ,  H04L1/0007 ,  H04L1/0033 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/0656

摘要： A method for transmitting a packet of N input bits includes encoding all of the N bits as a single entity, such as with an interleaver of length N within a turbo coder, outputting M encoded bits, channel interleaving the M bits, splitting the M encoded bits into a parallel first and second portion, and transmitting them over separate channels to achieve spatial diversity. The size of the first and second portion is determined based on a closed feedback loop that provides some knowledge of the channel, preferably a measure of channel capacity. The feedback loop may also provide channel knowledge to a subpacket selector associated with each transmit antenna, which determines an appropriate rate for that channel and selects subpackets to fill a transmission packet for that channel. The subpacket selectors choose a subpacket of systematic bits and fill the remaining transmission packet size with subpackets of parity bits. Eigenvectors may be employed to transmit each transmission packet over more than one channel with a power disparity between the channels. A transmitter according to the present invention is also described.

摘要翻译： 用于发送N个输入比特的分组的方法包括将所有N比特全部编码为单个实体，例如在Turbo编码器内具有长度为N的交织器，输出M个编码比特，对M个比特进行信道交织， 位到并行的第一和第二部分，并且通过单独的信道发送它们以实现空间分集。 第一和第二部分的大小基于提供信道的一些知识的闭合反馈回路来确定，优选地是信道容量的度量。 反馈回路还可以向与每个发射天线相关联的子分组选择器提供信道知识，其确定该信道的适当速率并选择子分组以填充该信道的传输分组。 子分组选择器选择系统比特的子分组，并用奇偶校验位的子分组填充剩余的传输分组大小。 可以采用特征向量在多个信道上以每个信道之间的功率差异来传输每个传输分组。 还描述了根据本发明的发射机。

公开(公告)号：US07586982B2

公开(公告)日：2009-09-08

申请号：US10431179

申请日：2003-05-06

申请人： Hoang Nguyen ,  Jianzhong Zhang ,  Balaji Raghothaman

发明人： Hoang Nguyen ,  Jianzhong Zhang ,  Balaji Raghothaman

IPC分类号： H03H7/30

CPC分类号： H04L25/03044 ,  H04B1/707 ,  H04L25/0236 ,  H04L25/03076 ,  H04L25/067 ,  H04L2025/03426 ,  H04L2025/03617 ,  H04L2025/03681

摘要： Disclosed is a minimum mean square error (MMSE) equalizer and method for single-user detection of a signal received from a downlink code-division multiple access CDMA channel. The equalizer includes a Kalman filter having an input coupled to the received signal for generating a best linear unbiased estimate of a transmitted chip sequence for a single user. A reduced computational complexity Kalman filter embodiment is also disclosed that only periodically updates a Kalman filter prediction error covariance matrix P(k|k−1), a Kalman filter filtering error covariance matrix P(k|k) and the Kalman gain K(k).

摘要翻译： 公开了一种用于单用户检测从下行链路码分多址CDMA信道接收的信号的最小均方误差（MMSE）均衡器和方法。 均衡器包括具有耦合到接收信号的输入的卡尔曼滤波器，用于为单个用户生成发送的码片序列的最佳线性无偏估计。 还公开了一种减少的计算复杂度卡尔曼滤波器实施例，其仅周期性地更新卡尔曼滤波器预测误差协方差矩阵P（k | k-1），卡尔曼滤波器滤波误差协方差矩阵P（k | k）和卡尔曼增益K ）。

公开(公告)号：US20050245280A1

公开(公告)日：2005-11-03

申请号：US10836808

申请日：2004-04-30

申请人： Ke Liu ,  Balaji Raghothaman ,  Jianzhong Zhang

发明人： Ke Liu ,  Balaji Raghothaman ,  Jianzhong Zhang

IPC分类号： H04B7/00 ,  H04B7/005 ,  H04B7/04

CPC分类号： H04W52/08 ,  H04B7/04 ,  H04W52/24 ,  H04W52/241 ,  H04W52/248 ,  H04W52/54

摘要： Apparatus, and an associated method, for compensating for the effects of fading, or other distortion, in an MIMO communication system. Analysis is made at a receiving station, such as through channel estimation by a channel estimator, of communication conditions on different sub-channels, defined by different communication paths upon which data streams are communicated to the receiving station from different transmit antenna transducers. Power controllers generate power change requests responsive to the channel estimations. The power change requests are returned to a sending station by way of a feedback channel. And, the power levels at which data is transmitted from different transmit antennas is correspondingly changed.

摘要翻译： 用于补偿MIMO通信系统中的衰落或其它失真的影响的装置和相关方法。 在接收站进行分析，例如通过信道估计器的信道估计，在由不同的通信路径定义的不同子信道上的通信条件进行分析，在该通信路径上，数据流从不同的发射天线换能器传送到接收站。 功率控制器响应于信道估计产生功率变化请求。 功率变化请求通过反馈信道返回给发送站。 并且，相应地改变了从不同发射天线发射数据的功率电平。

公开(公告)号：US07746800B2

公开(公告)日：2010-06-29

申请号：US10718837

申请日：2003-11-21

申请人： Balaji Raghothaman ,  Jianzhong Zhang

发明人： Balaji Raghothaman ,  Jianzhong Zhang

IPC分类号： G01R31/08 ,  H04B7/14

CPC分类号： H04B7/0417 ,  H04B7/0443 ,  H04B7/0465 ,  H04B7/0632 ,  H04B7/0669 ,  H04B7/0697 ,  H04L1/0002 ,  H04L1/0007 ,  H04L1/0033 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/0656

摘要： A method for transmitting a packet of N input bits includes encoding all of the N bits as a single entity, such as with an interleaver of length N within a turbo coder, outputting M encoded bits, channel interleaving the M bits, splitting the M encoded bits into a parallel first and second portion, and transmitting them over separate channels to achieve spatial diversity. The size of the first and second portion is determined based on a closed feedback loop that provides some knowledge of the channel, preferably a measure of channel capacity. The feedback loop may also provide channel knowledge to a subpacket selector associated with each transmit antenna, which determines an appropriate rate for that channel and selects subpackets to fill a transmission packet for that channel. The subpacket selectors choose a subpacket of systematic bits and fill the remaining transmission packet size with subpackets of parity bits. Eigenvectors may be employed to transmit each transmission packet over more than one channel with a power disparity between the channels. A transmitter according to the present invention is also described.

摘要翻译： 用于发送N个输入比特的分组的方法包括将所有N比特全部编码为单个实体，例如在Turbo编码器内具有长度为N的交织器，输出M个编码比特，对M个比特进行信道交织， 位到并行的第一和第二部分，并且通过单独的信道发送它们以实现空间分集。 第一和第二部分的大小基于提供信道的一些知识的闭合反馈回路来确定，优选地是信道容量的度量。 反馈回路还可以向与每个发射天线相关联的子分组选择器提供信道知识，其确定该信道的适当速率并选择子分组以填充该信道的传输分组。 子分组选择器选择系统比特的子分组，并用奇偶校验位的子分组填充剩余的传输分组大小。 可以采用特征向量在多个信道上以每个信道之间的功率差异来传输每个传输分组。 还描述了根据本发明的发射机。

公开(公告)号：US20070280336A1

公开(公告)日：2007-12-06

申请号：US10590671

申请日：2005-02-23

申请人： Jianzhong Zhang ,  Balaji Raghothaman ,  Giridhar Mandyam

发明人： Jianzhong Zhang ,  Balaji Raghothaman ,  Giridhar Mandyam

IPC分类号： H04Q7/00

CPC分类号： H04L25/03292 ,  H04L1/0631 ,  H04L1/0656

摘要： A system according to embodiments of this invention provide a multiple transmit antenna (117-1 . . . M), multiple receive antenna (121-1 . . . N) (MIMO) receiver (125) design for the communication downlinks such as those used in CDMA technology. Two algorithms referred to as the MIMO LMMSE-FFT and MIMO LMMSE-SIC (Successive Interference Cancellation) algorithms, are described in detail. In embodiments of the invention, the interference cancellation step is achieved without the impractical assumption of the knowledge of all the active Walsh codes in the systems, unlike many other interference cancellation based algorithms found in the literature.

摘要翻译： 根据本发明的实施例的系统提供用于诸如那些通信下行链路的多个发射天线（117-1M），多个接收天线（121-1.1）（MIMO）接收机（125）设计 用于CDMA技术。 被称为MIMO LMMSE-FFT和MIMO LMMSE-SIC（连续干扰消除）算法的两种算法被详细描述。 在本发明的实施例中，与在文献中发现的许多其他基于干扰消除的算法不同，实现干扰消除步骤，而不需要系统中所有活动沃尔什码的知识的不切实际的假设。

公开(公告)号：US08718697B2

公开(公告)日：2014-05-06

申请号：US12575113

申请日：2009-10-07

申请人： Anand Srinivas ,  Pierre A. Humblet ,  Balaji Raghothaman

发明人： Anand Srinivas ,  Pierre A. Humblet ,  Balaji Raghothaman

IPC分类号： H04B7/00

CPC分类号： H04W52/287 ,  H04B1/7103 ,  H04B2201/70702 ,  H04B2201/709709 ,  H04W52/143 ,  H04W52/46

摘要： Among other things, a method performed by a first access point is described. The method includes outputting signals. At least some of the signals interfere with communication between a device and a second access point. The method also includes determining whether to output the signals in a predefined mode based on dynamically calculated values of a parameter. The parameter is related to signal interference at the device. If it is determined to output the signals in the predefined mode, for a time period, the first access point outputs signals in the predefined mode.

摘要翻译： 其中，描述了由第一接入点执行的方法。 该方法包括输出信号。 至少一些信号干扰设备和第二接入点之间的通信。 该方法还包括基于动态计算的参数值来确定是否以预定模式输出信号。 该参数与设备的信号干扰有关。 如果确定在预定模式下输出信号一段时间，则第一接入点以预定模式输出信号。

公开(公告)号：US08295256B2

公开(公告)日：2012-10-23

申请号：US12201380

申请日：2008-08-29

申请人： Pierre A. Humblet ,  Amit Jain ,  Woojune Kim ,  Balaji Raghothaman

发明人： Pierre A. Humblet ,  Amit Jain ,  Woojune Kim ,  Balaji Raghothaman

IPC分类号： H04W4/00

CPC分类号： H04W48/12 ,  H04W12/08 ,  H04W48/20 ,  H04W52/0206 ,  H04W84/105 ,  H04W88/10 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146

摘要： This patent application relates to private access point beacon signals in wireless networks.

摘要翻译： 该专利申请涉及无线网络中的专用接入点信标信号。