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：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。

公开(公告)号：US20100008444A1

公开(公告)日：2010-01-14

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。

公开(公告)号：US20070191067A1

公开(公告)日：2007-08-16

申请号：US11706510

申请日：2007-02-13

申请人： Hoang Nguyen ,  Balaji Raghothaman

发明人： Hoang Nguyen ,  Balaji Raghothaman

IPC分类号： H04M1/00

CPC分类号： H04B7/0641 ,  H01Q1/1257 ,  H01Q3/2605 ,  H01Q3/2611 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/0639 ,  H04W24/00 ,  H04W88/08

摘要： A wireless communication system including receiving and base stations. The receiving station includes a detector that measures a downlink channel correlation matrix for multiple antennas of the base station, computes an antenna weight increment vector normal to a previous antenna weight vector rendering positive a directional derivative of total received power from the multiple antennas of the base station, and quantizes the antenna weight increment vector to produce a quantized antenna weight increment vector. The receiving station also includes a transmitter that sends the quantized antenna weight increment vector to the base station. The base station includes a beamformer selector that re-orthogonalizes the quantized antenna weight increment vector, and a weight vector modifier that calculates an antenna weight vector by adding an increment to the previous antenna weight vector proportional to the re-orthogonalized quantized antenna weight increment vector and renormalizes the antenna weight vector to unit length.

摘要翻译： 一种包括接收和基站的无线通信系统。 接收站包括测量基站的多个天线的下行链路信道相关矩阵的检测器，计算与前一天线权重向量法线的天线权重增量向量，从而从基站的多个天线得到总接收功率的方向导数 并量化天线权重增量向量以产生量化天线权重增量向量。 接收站还包括发送器，其将量化的天线加权增量向量发送到基站。 该基站包括一个波束形成器选择器，该波束形成器选择器使量化的天线加权增量矢量重新正交化;以及加权矢量修改器，其通过将与重新正交化的量化天线加权增量矢量成比例的先前天线加权矢量相加的增量来计算天线加权矢量 并将天线权重向量重新归一化为单位长度。

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：US06842632B2

公开(公告)日：2005-01-11

申请号：US10334045

申请日：2002-12-30

申请人： Balaji Raghothaman ,  R. Thomas Derryberry

发明人： Balaji Raghothaman ,  R. Thomas Derryberry

IPC分类号： H04B7/02 ,  H04B7/06 ,  H04B1/00 ,  H04B17/00 ,  H04M1/00

CPC分类号： H04B7/0641 ,  H04B7/022 ,  H04B7/0658

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. The technique is utilized during both non-handoff conditions and during handoff conditions.

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。 该技术在非切换条件和切换条件期间都被利用。

公开(公告)号：US09510177B2

公开(公告)日：2016-11-29

申请号：US14125302

申请日：2012-06-08

申请人： Tao Deng ,  Ravikumar V Pragada ,  Gregory S Sternberg ,  Balaji Raghothaman ,  Zhuorong Deng ,  Kiran K Vanganuru

发明人： Tao Deng ,  Ravikumar V Pragada ,  Gregory S Sternberg ,  Balaji Raghothaman ,  Zhuorong Deng ,  Kiran K Vanganuru

IPC分类号： H04W4/00 ,  H04W8/00 ,  H04W24/04 ,  H04W24/08 ,  H04W48/08 ,  H04W48/14 ,  H04W76/02 ,  H04W88/06

CPC分类号： H04W8/005 ,  H04W24/04 ,  H04W24/08 ,  H04W24/10 ,  H04W48/08 ,  H04W48/14 ,  H04W76/18 ,  H04W88/06

摘要： A method and apparatus for neighbor discovery in a wireless communication system are disclosed. A neighbor seeking wireless transmit/receive unit (WTRU) may send a first beacon based on configuration information provided by the network. The neighbor WTRUs receive the first beacon and may send either a report to the network or send a second beacon to the neighbor seeking WTRU. The network may then provide neighbor WTRU information to the neighbor seeking WTRU. The neighbor discovery may be performed within a pre-defined group of WTRUs that is formed based on proximity to the WTRU and/or an attribute of the WTRU. The neighbor discovery procedure may be performed to find neighbor WTRUs in case where a WTRU fails to find any network. A neighbor list may be generated by the neighbor seeking WTRU by measuring reference signals transmitted by neighbor WTRUs on an uplink to the network.

摘要翻译： 公开了一种用于无线通信系统中的邻居发现的方法和装置。 寻找无线发射/接收单元（WTRU）的邻居可以基于由网络提供的配置信息发送第一信标。 相邻WTRU接收第一信标，并且可以向网络发送报告或者向邻居寻找WTRU发送第二信标。 网络然后可以向邻居寻找WTRU提供相邻WTRU信息。 可以在基于与WTRU的接近度和/或WTRU的属性形成的WTRU的预定义组内执行邻居发现。 在WTRU无法找到任何网络的情况下，可以执行邻居发现过程以找到相邻WTRU。 可以通过在上行链路上测量由相邻WTRU发送的参考信号，由邻居寻找WTRU生成邻居列表。

公开(公告)号：US07907571B2

公开(公告)日：2011-03-15

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： H04Q7/00

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：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。