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1. 发明申请

US20060140289A1 Method and apparatus for providing an efficient pilot scheme for channel estimation 审中-公开
标题翻译：用于提供用于信道估计的有效导频方案的方法和装置
公开(公告)号：US20060140289A1
公开(公告)日：2006-06-29
申请号：US11023287
申请日：2004-12-27
申请人： Giridhar Mandyam , Balaji Raghothaman , Roy Derryberry
发明人： Giridhar Mandyam , Balaji Raghothaman , Roy Derryberry
IPC分类号： H04K1/10 , H04B1/707
CPC分类号： H04B1/707 , H04B2201/70701
摘要： An approach for utilizing a pilot scheme in a spread spectrum communication system (e.g., Multi Carrier Code Division Multiple Access (MC-CDMA)) is provided. A communications link includes a sub-bands and a single pilot channel that is designated for the sub-bands for channel estimation. Pilot symbols transmitted over the single pilot channel are used to determine a first channel estimate associated with a first one of the sub-bands, and a second channel estimate corresponding to a second one of the sub-bands is derived from the first channel estimate.
摘要翻译：提供了在扩频通信系统（例如，多载波码分多址（MC-CDMA））中利用导频方案的方法。通信链路包括被指定用于信道估计的子带的子带和单个导频信道。通过单个导频信道发送的导频符号用于确定与子频带中的第一个相关联的第一信道估计，并且从第一信道估计导出对应于第二子频带的第二信道估计。

2. 发明申请

US20060013328A1 Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels 失效
标题翻译：用于频率选择信道中时空编码MIMO扩频系统的新型信道质量指示符的方法和检测器
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。

3. 发明授权

US07606319B2 Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels 失效
标题翻译：用于频率选择信道中时空编码MIMO扩频系统的新型信道质量指示符的方法和检测器
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。

4. 发明申请

US20070280336A1 Constrained Optimization Based Mimo Lmmse-Sic Receiver for Cdma Downlink 审中-公开
标题翻译：用于Cdma下行链路的基于Mimo Lmmse-Sic接收器的约束优化
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。

5. 发明授权

US08718697B2 Mitigating interference using cooperative scheduling 有权
标题翻译：使用协同调度减轻干扰
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。

6. 发明授权

US08295256B2 Private access point beacon signals in wireless networks 有权
标题翻译：无线网络中的专用接入点信标信号
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。

7. 发明申请

US20120064929A1 Information Sharing In a Private Access Point Network 有权
标题翻译：私人接入点网络中的信息共享
公开(公告)号：US20120064929A1
公开(公告)日：2012-03-15
申请号：US13300242
申请日：2011-11-18
申请人： Balaji Raghothaman , Deepak Das , Anand Srinivas , Pierre A. Humblet
发明人： Balaji Raghothaman , Deepak Das , Anand Srinivas , Pierre A. Humblet
IPC分类号： H04W52/24 , H04W24/00
CPC分类号： H04W52/50 , H04B17/318 , H04W52/242 , H04W52/243 , H04W52/244 , H04W52/245
摘要： This description relates to information sharing in a private access point network.
摘要翻译：该描述涉及专用接入点网络中的信息共享。

8. 发明授权

US07599443B2 Method and apparatus to balance maximum information rate with quality of service in a MIMO system 失效
标题翻译：在MIMO系统中平衡最大信息速率与服务质量的方法和装置
公开(公告)号：US07599443B2
公开(公告)日：2009-10-06
申请号：US10940060
申请日：2004-09-13
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：在无线MIMO通信系统中，对于信息帧的N个符号，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。

9. 发明授权

US06934563B2 Apparatus, and associated method, for selecting antenna pattern configuration to be exhibited by an antenna assembly of a communication station 失效
标题翻译：用于选择由通信站的天线组件展现的天线方向图配置的设备和相关方法
公开(公告)号：US06934563B2
公开(公告)日：2005-08-23
申请号：US10080954
申请日：2002-02-22
申请人： Balaji Raghothaman , Shu-Shaw Wang
发明人： Balaji Raghothaman , Shu-Shaw Wang
IPC分类号： H01Q3/26 , H04B1/38 , H04M1/00
CPC分类号： H01Q3/2605
摘要： Apparatus, and an associated method, for facilitating selection of antenna pattern characteristics to be exhibited by an antenna assembly of a communication station, such as a base transceiver station operable in a cellular communication system. Indications of channel conditions on an uplink channel are utilized in the determination of antenna weighting values by which to weight antenna weighting elements of the antenna assembly. In one implementation, an uplink channel correlation matrix is reformulated into vector form to reduce the computational complexity of calculations required to select the antenna weighting values. In another implementation, a discrete Fourier transform operation is performed using fast Fourier transform techniques to select the antenna weighting values.
摘要翻译：装置和相关联的方法，用于促进由通信站的天线组件（诸如在蜂窝通信系统中可操作的基站收发台）所呈现的天线方向图特征的选择。在确定天线加权值时，利用上行链路信道上的信道条件的指示来加权天线组合件的天线加权元件。在一个实现中，将上行链路信道相关矩阵重新形成向量形式，以减少选择天线加权值所需的计算的计算复杂度。在另一实现中，使用快速傅里叶变换技术来执行离散傅里叶变换操作以选择天线加权值。

10. 发明申请

US20050111376A1 Flexible rate split method for MIMO transmission 失效
标题翻译：用于MIMO传输的灵活速率分割方法
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。

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