公开(公告)号：US20100329132A1

公开(公告)日：2010-12-30

申请号：US12495125

申请日：2009-06-30

申请人： Balaji Raghothaman ,  Rayadurgam Ravikanth

发明人： Balaji Raghothaman ,  Rayadurgam Ravikanth

IPC分类号： H04L1/00 ,  H04W4/00

CPC分类号： H04W52/325 ,  H04B17/318 ,  H04B17/345 ,  H04W52/143 ,  H04W52/244 ,  H04W84/045

摘要： Techniques for reducing beacon interference include identifying a mobile device located within a coverage area serviced by a first access point, determining a power of a signal transmitted by a mobile device to a second access point; and modifying the beacon to reduce interference.

摘要翻译： 用于减少信标干扰的技术包括识别位于由第一接入点服务的覆盖区域内的移动设备，确定由移动设备向第二接入点发送的信号的功率; 并修改信标以减少干扰。

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：US07286845B2

公开(公告)日：2007-10-23

申请号：US10611316

申请日：2003-06-30

申请人： Adrian Boariu ,  Balaji Raghothaman

发明人： Adrian Boariu ,  Balaji Raghothaman

IPC分类号： H04Q7/20

CPC分类号： H04W52/42 ,  H04W52/281 ,  H04W52/286 ,  H04W52/288 ,  H04W52/343 ,  H04W52/346

摘要： A method for scheduling weighted transmissions from two or more transmit antennas of a base station to each of two or more mobile stations in a closed-loop transmit diversity system, whereby the quantity of power available for data transmission from each transmit antenna is determined and, with respect to each antenna, the power required to transmit data to each mobile station is determined. The number of mobile stations that may be served simultaneously by a base station is determined and, for each combination of respective mobile stations constituting the number of mobile stations that may be served simultaneously, the transmission of data from each transmit antenna to the mobile stations is scheduled to minimize unused power.

摘要翻译： 一种用于从基站的两个或更多个发射天线到闭环发射分集系统中的两个或更多个移动站中的每一个调度加权传输的方法，由此确定可用于从每个发射天线进行数据传输的功率量， 对于每个天线，确定向每个移动台发送数据所需的功率。 确定可以由基站同时服务的移动站的数量，并且对于构成可以同时服务的移动站的数量的各个移动站的每个组合，从每个发射天线到移动站的数据的传输是 计划尽量减少未使用的电力。

公开(公告)号：US07212838B2

公开(公告)日：2007-05-01

申请号：US10832049

申请日：2004-04-26

申请人： Balaji Raghothaman

发明人： Balaji Raghothaman

IPC分类号： H04M1/00

CPC分类号： H04B7/0639 ,  H04B7/0636 ,  H04B7/0854

摘要： Apparatus, and an associated method, for facilitating selection of optimal antenna weightings by which to weight signals sent in a communication system that utilizes closed-loop transmit diversity. A deterministic perturbation gradient approximation technique is utilized in which perturbation vectors are selected by a selector and applied, by an applicator, to antenna weighting elements. A selected set of perturbation vectors are applied to the antenna weighting elements in both a positive direction and a negative direction. A detector at a receiving station measures in disassociated with the signals communicated thereto, once weighted with the perturbation vectors. A single-bit feedback value is returned to the sending station, and the antenna weightings are appropriately adjusted.

摘要翻译： 装置和相关联的方法，用于促进选择最优天线权重，通过该权重对在利用闭环发射分集的通信系统中发送的信号进行加权。 采用确定性扰动梯度近似技术，其中扰动矢量由选择器选择并由施加器施加到天线加权元件。 所选择的一组扰动矢量在正方向和负方向上被施加到天线加权元件。 接收站的检测器测量一次用扰动向量加权后与传送给其的信号分离。 将单位反馈值返回给发送站，并适当地调整天线权重。

公开(公告)号：US20060056534A1

公开(公告)日：2006-03-16

申请号：US10940060

申请日：2004-09-13

申请人： Dumitru Ionescu ,  Balaji Raghothaman

发明人： Dumitru Ionescu ,  Balaji Raghothaman

IPC分类号： H04L1/02

CPC分类号： H04L1/006 ,  H04B7/0443 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/0687

摘要： Disclosed is a method to operate a wireless MIMO communication system, where the method includes, for N symbols of a frame of information to be transmitted through a plurality of eigen sub-channels, allocating N1, symbols to a stronger eigen sub-channel and N2 symbols to a weaker eigen sub-channel, where N1, >N2; determining a probability of reception error when transmitting the N2 symbols through the weaker eigen sub-channel for an auxiliary signal-to-noise ratio; solving for a quality of service QoS of the weaker eigen sub-channel and if the QoS is less than a desired QoS, decreasing the value of N and repeating allocating symbols, determining the probability of reception error and solving for the QoS. The symbols may be systematic symbols output from a turbo coder, and thus replicate the original source bits. In another aspect this invention provides a method to operate a wireless MIMO communication system that includes asymmetrically allocating spreading codes to a stronger eigen sub-channel and to a weaker eigen sub-channel such that the stronger eigen sub-channel is allocated more spreading codes than the weaker eigen sub-channel; and transmitting all systematic bits of turbo coded information over the stronger eigen sub-channel.

摘要翻译： 公开了一种操作无线MIMO通信系统的方法，其中该方法包括：通过多个本征子信道发送的信息帧的N个符号，分配N 1个符号到 更强的本征子信道和N 2个符号分配给较弱的特征子信道，其中N 1，N 2，N 2， 当辅助信噪比通过较弱的本征子信道发送N 2个符号时，确定接收错误的概率; 解决较弱本征子信道的服务质量QoS，如果QoS小于期望的QoS，则减小N的值并重复分配符号，确定接收错误的概率并解决QoS。 符号可以是从turbo编码器输出的系统符号，并且因此复制原始源比特。 在另一方面，本发明提供了一种操作无线MIMO通信系统的方法，该无线MIMO通信系统包括将扩展码不对称地分配给更强的本征子信道和较弱的本征子信道，使得更强的本征子信道被分配更多的扩频码 弱特征子信道; 并通过更强的本征子信道发送turbo编码信息的所有系统比特。

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：US20050064908A1

公开(公告)日：2005-03-24

申请号：US10669128

申请日：2003-09-23

申请人： Adrian Boariu ,  Balaji Raghothaman

发明人： Adrian Boariu ,  Balaji Raghothaman

IPC分类号： H04B20060101 ,  H04B7/06 ,  H04W16/28 ,  H04W72/08 ,  H04Q7/20

CPC分类号： H04W16/28 ,  H04B7/061 ,  H04W24/00 ,  H04W88/06

摘要： Apparatus, and an associated method, for facilitating communication of encoded data, formed of a systematic part and a non-systematic part, in a radio communication system. Systematic parts of the encoded data are assigned by an assignor to transmit antennas that are associated with communication channels exhibiting better, or best, communication quality levels. Determinations are made of communication conditions to rank the transmit antennas, thereby permit appropriate assignments of the encoded data to transmit antennas. Feedback is provided by the receiver that receives the transmitted data. The feedback information includes, or is formed responsive to, detections and other measurements at the receivers.

摘要翻译： 一种用于在无线电通信系统中促进由系统部分和非系统部分形成的编码数据的通信的装置和相关方法。 编码数据的系统部分由分配者分配以发送与展现更好或最好的通信质量水平的通信信道相关联的天线。 确定对发射天线进行排序的通信条件，从而允许将编码数据适当地分配给发射天线。 反馈由接收发送数据的接收器提供。 反馈信息包括或响应于接收器处的检测和其他测量形成。

公开(公告)号：US08774134B2

公开(公告)日：2014-07-08

申请号：US12343438

申请日：2008-12-23

申请人： Balaji Raghothaman ,  Woojune Kim

发明人： Balaji Raghothaman ,  Woojune Kim

IPC分类号： H04W4/00

CPC分类号： H04W36/30 ,  H04W8/24 ,  H04W24/00

摘要： This description relates to access terminal hand-off methods in wireless networks.

摘要翻译： 本说明书涉及无线网络中的接入终端切换方法。

公开(公告)号：US08452299B2

公开(公告)日：2013-05-28

申请号：US11962983

申请日：2007-12-21

申请人： Balaji Raghothaman

发明人： Balaji Raghothaman

IPC分类号： H04W74/00

CPC分类号： H04W24/10 ,  H04J13/00 ,  H04J13/16 ,  H04W72/08 ,  H04W88/08

摘要： In addition to other aspects disclosed, a portable base station requests a mobile handset to measure signal strengths associated with a portion of a code space. The portable base station also sends a message that represents the signal strength measurements to a remotely located control station.

摘要翻译： 除了所公开的其它方面之外，便携式基站请求移动手持机测量与代码空间的一部分相关联的信号强度。 便携式基站还向远程位置的控制台发送表示信号强度测量的消息。

公开(公告)号：US07991068B2

公开(公告)日：2011-08-02

申请号：US12583272

申请日：2009-08-18

申请人： Dumitru M. Ionescu ,  Balaji Raghothaman

发明人： Dumitru M. Ionescu ,  Balaji Raghothaman

IPC分类号： H04B7/02

CPC分类号： H04L1/006 ,  H04B7/0443 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/0687

摘要： In a wireless MIMO communication system for N symbols of a frame of information, allocating N1 symbols to a stronger eigen sub-channel and N2 symbols to a weaker eigen sub-channel, where N1>N2; determining a probability of reception error when transmitting the N2 symbols through the weaker eigen sub-channel for an auxiliary signal-to-noise ratio; solving for a quality of service QoS of the weaker eigen sub-channel and if the QoS is less than a desired QoS, decreasing the value of N and repeating allocating symbols, determining the probability of reception error and solving for the QoS. Another aspect includes asymmetrically allocating spreading codes to a stronger eigen sub-channel and to a weaker eigen sub-channel such that the stronger eigen sub-channel is allocated more spreading codes than the weaker eigen sub-channel; and transmitting all systematic bits of turbo coded information over the stronger eigen sub-channel.

摘要翻译： 在用于信息帧的N个符号的无线MIMO通信系统中，将N1个符号分配给更强的本征子信道，将N 2个符号分配给较弱的本征子信道，其中N1> N2; 当辅助信噪比通过较弱的本征子信道发送N 2个符号时，确定接收错误的概率; 解决较弱本征子信道的服务质量QoS，如果QoS小于期望的QoS，则减小N的值并重复分配符号，确定接收错误的概率并解决QoS。 另一方面包括将扩展码不对称地分配给更强的本征子信道和较弱的本征子信道，使得更强的本征子信道被分配比较弱的本征子信道更多的扩展码; 并通过更强的本征子信道发送turbo编码信息的所有系统比特。