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1. 发明授权

US06937592B1 Wireless communications system that supports multiple modes of operation 失效
公开(公告)号：US06937592B1
公开(公告)日：2005-08-30
申请号：US09653060
申请日：2000-09-01
申请人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04B7/212 , H04B7/216 , H04L12/56
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.

2. 发明申请

US20130286962A1 WIRELESS COMMUNICATIONS SYSTEM THAT SUPPORTS MULTIPLE MODES OF OPERATION 审中-公开
标题翻译：支持多种操作模式的无线通信系统
公开(公告)号：US20130286962A1
公开(公告)日：2013-10-31
申请号：US13858784
申请日：2013-04-08
申请人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04W72/04
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： Embodiments of a base transceiver station and method for transmitting are described herein. In some embodiments, data is transmitted over a downlink channel in accordance with a selected one of a plurality of transmission modes. The base transceiver station may be configurable to transmit data in accordance with each of the transmission modes. One of the transmissions modes may be selected for the data transmission based at least in part on feedback reported by a subscriber unit. The transmission modes include at least a single antenna mode, a transmit diversity mode, and a spatial multiplexing mode.
摘要翻译：这里描述了基站收发信机的实施例和传输方法。在一些实施例中，数据通过下行链路信道根据多个传输模式中选择的一个发送。基站收发器可以被配置为根据每个传输模式发送数据。可以至少部分地基于用户单元报告的反馈来选择传输模式之一用于数据传输。传输模式至少包括单一天线模式，发射分集模式和空间复用模式。

3. 发明申请

US20100046429A1 Wireless Communications System That Supports Multiple Modes Of Operation 有权
标题翻译：支持多种操作模式的无线通信系统
公开(公告)号：US20100046429A1
公开(公告)日：2010-02-25
申请号：US12496922
申请日：2009-07-02
申请人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04W40/00
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.
摘要翻译：无线通信响应于传输特定变量，适应其在空间复用和非空间复用之间的操作模式。用于在基站和用户单元之间发送信息的无线通信系统的实施例包括模式确定逻辑。模式确定逻辑与基站收发台和用户单元通信。模式确定逻辑响应于接收到的信号，确定在基站收发台和订户单元之间是否应使用空间复用或非空间复用来发送订户数据流。在一个实施例中，模式确定逻辑具有用于接收与所接收信号相关的传输特性的度量的输入。在一个实施例中，模式确定逻辑包括用于将所测量的传输特性与传输特性阈值进行比较并用于响应于测量的传输特性与传输特性阈值的比较来选择空间复用和非空间复用之一的逻辑。在一个实施例中，传输特性包括延迟扩展，后处理信噪比，循环冗余校验（CRC）故障，残余符号间干扰，均方误差，相干时间和路径损耗中的至少一个。通过适应传输特定变量的操作模式，可以在不利条件下停止使用空间复用。此外，由于无线通信系统能够适应空间复用和非空间复用之间的操作模式，所以通信系统与支持空间复用的两个用户单元和不支持空间复用的用户单元兼容。

4. 发明授权

US07586873B2 Wireless communications system that supports multiple modes of operation 有权
标题翻译：支持多种操作模式的无线通信系统
公开(公告)号：US07586873B2
公开(公告)日：2009-09-08
申请号：US11101813
申请日：2005-04-07
申请人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04W4/00 , H04B7/216 , H04H20/67
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.
摘要翻译：无线通信响应于传输特定变量，适应其在空间复用和非空间复用之间的操作模式。用于在基站和用户单元之间发送信息的无线通信系统的实施例包括模式确定逻辑。模式确定逻辑与基站收发台和用户单元通信。模式确定逻辑响应于接收到的信号，确定在基站收发台和订户单元之间是否应使用空间复用或非空间复用来发送订户数据流。在一个实施例中，模式确定逻辑具有用于接收与所接收信号相关的传输特性的度量的输入。在一个实施例中，模式确定逻辑包括用于将所测量的传输特性与传输特性阈值进行比较并用于响应于测量的传输特性与传输特性阈值的比较来选择空间复用和非空间复用之一的逻辑。在一个实施例中，传输特性包括延迟扩展，后处理信噪比，循环冗余校验（CRC）故障，残余符号间干扰，均方误差，相干时间和路径损耗中的至少一个。通过适应传输特定变量的操作模式，可以在不利条件下停止使用空间复用。此外，由于无线通信系统能够适应空间复用和非空间复用之间的操作模式，所以通信系统与支持空间复用的两个用户单元和不支持空间复用的用户单元兼容。

5. 发明授权

US08428037B2 Wireless communications system that supports multiple modes of operation 有权
公开(公告)号：US08428037B2
公开(公告)日：2013-04-23
申请号：US12604350
申请日：2009-10-22
申请人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04W4/00
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.

6. 发明申请

US20100142636A1 WIRELESS COMMUNICATIONS SYSTEM THAT SUPPORTS MULTIPLE MODES OF OPERATION 有权
标题翻译：支持多种操作模式的无线通信系统
公开(公告)号：US20100142636A1
公开(公告)日：2010-06-10
申请号：US12604350
申请日：2009-10-22
申请人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, JR. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04K1/10
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.
摘要翻译：无线通信响应于传输特定变量，适应其在空间复用和非空间复用之间的操作模式。用于在基站和用户单元之间发送信息的无线通信系统的实施例包括模式确定逻辑。模式确定逻辑与基站收发台和用户单元通信。模式确定逻辑响应于接收到的信号，确定在基站收发台和订户单元之间是否应使用空间复用或非空间复用来发送订户数据流。在一个实施例中，模式确定逻辑具有用于接收与所接收信号相关的传输特性的度量的输入。在一个实施例中，模式确定逻辑包括用于将所测量的传输特性与传输特性阈值进行比较并用于响应于测量的传输特性与传输特性阈值的比较来选择空间复用和非空间复用之一的逻辑。在一个实施例中，传输特性包括延迟扩展，后处理信噪比，循环冗余校验（CRC）故障，残余符号间干扰，均方误差，相干时间和路径损耗中的至少一个。通过适应传输特定变量的操作模式，可以在不利条件下停止使用空间复用。此外，由于无线通信系统能够适应空间复用和非空间复用之间的操作模式，所以通信系统与支持空间复用的两个用户单元和不支持空间复用的用户单元兼容。

7. 发明授权

US08345637B2 Wireless communications system that supports multiple modes of operation 有权
标题翻译：支持多种操作模式的无线通信系统
公开(公告)号：US08345637B2
公开(公告)日：2013-01-01
申请号：US12496922
申请日：2009-07-02
申请人： Robert W. Heath , Rajeev Krishnamoorthy , Arogyaswami J. Paulraj , Peroor K. Sebastian
发明人： Robert W. Heath , Rajeev Krishnamoorthy , Arogyaswami J. Paulraj , Peroor K. Sebastian
IPC分类号： H04W4/00
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber data stream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing.
摘要翻译：无线通信响应于传输特定变量，适应其在空间复用和非空间复用之间的操作模式。用于在基站和用户单元之间发送信息的无线通信系统的实施例包括模式确定逻辑。模式确定逻辑与基站收发台和用户单元通信。模式确定逻辑响应于所接收的信号，确定在基站收发台和订户单元之间是否应利用空间复用或非空间复用来发送用户数据流。

8. 发明授权

US5623511A Spread spectrum code pulse position modulated receiver having delay spread compensation 失效
标题翻译：扩频码脉冲位置调制接收机具有延迟扩展补偿
公开(公告)号：US5623511A
公开(公告)日：1997-04-22
申请号：US345110
申请日：1994-11-28
申请人： Israel Bar-David , Rajeev Krishnamoorthy
发明人： Israel Bar-David , Rajeev Krishnamoorthy
IPC分类号： H04L27/22 , H04B1/69 , H04B14/02 , H04L27/18 , H04K1/00
CPC分类号： H04B1/7093 , H04B1/69 , H04B1/707 , H04B14/026
摘要： A spread spectrum code pulse position modulated communication system is disclosed. The communication system includes a spread spectrum code pulse position modulated receiver that compensates for the delay spread of a transmission medium, such as a wireless radio channel of a local area network. Delay spread may cause signal components of one transmitted spread spectrum codeword to spill over into chip positions of adjacent symbols, causing intersymbol interference, or into chip positions on quadrature channels of a given symbol interval, such as in a QPSK implementation, causing interchip interference. The disclosed receiver decodes a transmitted spread spectrum code pulse position modulated signal in the presence of such delay spread, utilizing a tentative symbol estimator to sample the matched filter data. The tentative symbol estimator will assign a weight to each potential symbol value, taking into account the cross-rail or bias influence caused by the residual coupling between the signals on quadrature channels for a given symbol duration. In addition, the disclosed receiver includes a mode sifter which evaluates the weighted values for each symbol estimate and assigns final estimates to each symbol value, taking into account the influence of codewords transmitted during one or more successive symbol intervals on one another.
摘要翻译：公开了一种扩频码脉冲位置调制通信系统。通信系统包括扩频码脉冲位置调制接收机，用于补偿诸如局域网的无线无线电信道之类的传输介质的延迟扩展。延迟扩展可能导致一个发射的扩展频谱码字的信号分量溢出到相邻符号的码片位置，导致符号间干扰，或者在给定符号间隔的正交信道上的码片位置，例如在QPSK实现中，导致芯片间干扰。所公开的接收机在存在这种延迟扩展的情况下解码发射的扩频码脉冲位置调制信号，利用临时符号估计器来对匹配的滤波数据进行采样。考虑到在给定符号持续时间内正交信道上的信号之间的残余耦合引起的横轨或偏置影响，暂定符号估计器将为每个潜在符号值分配权重。此外，所公开的接收机包括模式筛选器，其对每个符号估计的加权值进行评估，并且考虑到在一个或多个连续符号间隔期间彼此发送的码字的影响，将最终估计分配给每个符号值。

9. 发明授权

US08805304B2 Linearization of broadband power amplifiers 有权
标题翻译：宽带功率放大器的线性化
公开(公告)号：US08805304B2
公开(公告)日：2014-08-12
申请号：US13343631
申请日：2012-01-04
申请人： Qian Yu , Rajeev Krishnamoorthy , Olivier Charlon
发明人： Qian Yu , Rajeev Krishnamoorthy , Olivier Charlon
IPC分类号： H04B1/04
CPC分类号： H03F1/3258 , H03F3/195 , H03F3/245 , H03F3/45376 , H03F3/45892 , H03F2200/336 , H03F2203/45394 , H03F2203/45562 , H03F2203/45614 , H03F2203/45616
摘要： An RF linearizer and an associated method are provided for linearizing a power amplifier. The RF linearizer may include: (a) a quadrature up-converter for up-converting a baseband input signal that is to be transmitted by the power amplifier; (b) an RF analog predistorter controlled by a set of coefficients for predistorting the up-converted input signal; (c) a down-converter for down-converting an output signal of the power amplifier; (d) an error monitor receiving the down-converted output signal and the input signal for providing an error signal; and (e) a signal analyzer receiving the error signal, the signal analyzer using an out-of-band power spectrum of the error signal to optimize the set of coefficients. The input signal may have an in-phase component and a quadrature component.
摘要翻译：提供RF线性化器和相关联的方法用于线性化功率放大器。 RF线性化器可以包括：（a）用于上变频由功率放大器发送的基带输入信号的正交上变频器; （b）由一组系数控制的RF模拟预失真器，用于预失真上变频的输入信号; （c）用于对功率放大器的输出信号进行下变频的下变频器; （d）误差监视器，接收所述下变频输出信号和所述输入信号以提供误差信号; 以及（e）信号分析仪，其接收误差信号，所述信号分析仪使用所述误差信号的带外功率谱来优化所述系数集合。输入信号可以具有同相分量和正交分量。

10. 发明申请

US20080248802A1 Antenna pattern selection within a wireless network 审中-公开
标题翻译：无线网络内的天线模式选择
公开(公告)号：US20080248802A1
公开(公告)日：2008-10-09
申请号：US11784624
申请日：2007-04-09
申请人： Rajeev Krishnamoorthy
发明人： Rajeev Krishnamoorthy
IPC分类号： H04Q7/20
CPC分类号： H04W16/28 , H01Q3/2605 , H04B7/0689 , H04B17/336
摘要： A method of a multiple antenna node within a wireless network selecting an antenna pattern is disclosed. The method includes identifying a plurality of transmission paths through the node. One of a plurality of antenna patterns formed by the multiple antenna node is selected, providing a desired level of link quality through each of the identified plurality of transmission paths. The node wirelessly communicates through the identified transmission paths.
摘要翻译：公开了一种选择天线图案的无线网络内的多天线节点的方法。该方法包括识别通过节点的多个传输路径。选择由多天线节点形成的多个天线方向图之一，通过识别出的多个传输路径中的每一个提供期望的链路质量水平。节点通过识别的传输路径无线通信。

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