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1. 发明授权

US07058146B2 Method and wireless communications systems using coordinated transmission and training for interference mitigation 失效
公开(公告)号：US07058146B2
公开(公告)日：2006-06-06
申请号：US09876896
申请日：2001-06-06
申请人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
发明人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
IPC分类号： H04L1/02 , H04B7/10
CPC分类号： H04B7/0842 , H04B7/086 , H04L1/06
摘要： A method for interference mitigation in a wireless communication system having multiple transmitters and receivers by introducing transmission time delays between the transmission of signals from the individual transmitters to ensure coherent reception of the signals at a specific point in the coverage area, such as at a center of distribution of the receivers. To further aid in interference mitigation the signals are assigned training patterns chosen to be distinguishable by the receiver and to optimize interference mitigation. The training patterns can be selected based on a feedback parameter, e.g., a measure of the quality of interference mitigation obtained from the receiver. The present method can be used in wireless communication systems which re-use frequencies including TDMA, CDMA, FDMA, OFDMA or other multiplex communication systems using a multiple access method or a combination of such methods.

2. 发明授权

US06377636B1 Method and wireless communications system using coordinated transmission and training for interference mitigation 失效
标题翻译：方法和无线通信系统采用协调传输和训练进行干扰减轻
公开(公告)号：US06377636B1
公开(公告)日：2002-04-23
申请号：US09432295
申请日：1999-11-02
申请人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
发明人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
IPC分类号： H04L100
CPC分类号： H04B7/0842 , H04B7/086 , H04L1/06
摘要： A method for interference mitigation in a wireless communication system having multiple transmitters and receivers by introducing transmission time delays between the transmission of signals from the individual transmitters to ensure coherent reception of the signals at a specific point in the coverage area, such as at a center of distribution of the receivers. To further aid in interference mitigation the signals are assigned training patterns chosen to be distinguishable by the receiver and to optimize interference mitigation. The training patterns can be selected based on a feedback parameter, e.g., a measure of the quality of interference mitigation obtained from the receiver. The present method can be used in wireless communication systems which re-use frequencies including TDMA, CDMA, FDMA, OFDMA or other multiplex communication systems using a multiple access method or a combination of such methods.
摘要翻译：一种用于具有多个发射机和接收机的无线通信系统中的干扰减轻的方法，其通过在来自各个发射机的信号的传输之间引入传输时间延迟，以确保覆盖区域中的特定点处的信号的相干接收，例如在中心的接收机的分配。为了进一步帮助干扰减轻，信号被分配训练模式，所选择的训练模式被接收机区分，并优化干扰减轻。可以基于反馈参数来选择训练模式，例如，从接收器获得的干扰抑制的质量的度量。本方法可以用于使用多址接入方法或这些方法的组合重复使用包括TDMA，CDMA，FDMA，OFDMA或其他多路复用通信系统的频率的无线通信系统。

3. 发明授权

US06377632B1 Wireless communication system and method using stochastic space-time/frequency division multiplexing 失效
标题翻译：使用随机时空/频分复用的无线通信系统和方法
公开(公告)号：US06377632B1
公开(公告)日：2002-04-23
申请号：US09490698
申请日：2000-01-24
申请人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr. , Shilpa Talwar , Helmut Bölcskei
发明人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr. , Shilpa Talwar , Helmut Bölcskei
IPC分类号： H04B706
CPC分类号： H04B7/0669 , H04B7/0671 , H04L1/0606 , H04L1/0625 , H04L5/0023
摘要： A method and apparatus for wireless transmission of a digital bit stream. The present method employs diversity techniques to minimize multipath fading. Digital bits are converted into symbols and the symbols are provided to a number of diversity branches. Each diversity branch has its own antenna. The symbols sent to each diversity branch may be multiplied by a different phase factor or amplitude factor. The phase factors and amplitude factors may be randomly selected. Also, wireless channels can be monitored for channel quality. In this case, the channel quality measurements are used to select the phase factors and the amplitude factors. Also, the symbols can be grouped into frames before transmission. In this case, the frames can be multiplied by matrices comprising phase factors and amplitude factors. Also in this case, the frames can undergo cyclic shifting, which provides an additional measure of diversity.
摘要翻译：一种用于数字比特流的无线传输的方法和装置。本方法采用分集技术来最小化多路径衰落。数字位被转换为符号，符号被提供给多个分集分支。每个分集分支都有自己的天线。发送到每个分集支路的符号可以乘以不同的相位因子或振幅因子。可以随机选择相位因子和振幅因子。此外，可以监控无线信道的信道质量。在这种情况下，通道质量测量用于选择相位因子和振幅因子。此外，符号可以在传输之前被分组成帧。在这种情况下，帧可以乘以包括相位因子和幅度因子的矩阵。同样在这种情况下，帧可以经历循环移位，这提供了多样性的附加度量。

4. 发明授权

US07921349B2 Mode selection for data transmission in wireless communication channels based on statistical parameters 有权
标题翻译：基于统计参数的无线通信信道数据传输模式选择
公开(公告)号：US07921349B2
公开(公告)日：2011-04-05
申请号：US12823267
申请日：2010-06-25
申请人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H03M13/00
CPC分类号： H04L1/06 , H04L1/0001 , H04L1/0002 , H04L1/0009 , H04L1/0016 , H04L1/0021 , H04L1/0026 , H04L1/0033 , H04L1/20
摘要： A method and communication system for selecting a mode for encoding data for transmission in a wireless communication channel between a transmit unit and a receive unit. The data is initially transmitted in an initial mode and the selection of the subsequent mode is based on a selection of first-order and second-order statistical parameters of short-term and long-term quality parameters. Suitable short-term quality parameters include signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR), power level and suitable long-term quality parameters include error rates such as bit error rate (BER) and packet error rate (PER). The method of the invention can be employed in Multiple Input. Multiple Output (MIMO), Multiple Input Single Output (MISO), Single Input Single Output (SISO) and Single Input Multiple Output (SIMO) communication systems to make subsequent mode selection faster and more efficient. Furthermore the method can be used in communication systems employing various transmission protocols including OFDMA, FDMA, CDMA, TDMA.
摘要翻译：一种用于选择用于在发送单元和接收单元之间的无线通信信道中进行数据传输的模式的方法和通信系统。最初以初始模式发送数据，并且随后的模式的选择是基于对短期和长期质量参数的一阶和二阶统计参数的选择。合适的短期质量参数包括信噪比和噪声比（SINR），信噪比（SNR），功率电平和合适的长期质量参数，包括错误率，如误码率（BER）和数据包错误率（PER）。本发明的方法可以用于多输入。多输出（MIMO），多输入单输出（MISO），单输入单输出（SISO）和单输入多输出（SIMO）通信系统，使后续模式选择更快更有效。此外，该方法可以用于采用包括OFDMA，FDMA，CDMA，TDMA的各种传输协议的通信系统。

5. 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.

6. 发明授权

US06678253B1 Subscriber unit incorporating spatial multiplexing 有权
标题翻译：采用空间复用的用户单元
公开(公告)号：US06678253B1
公开(公告)日：2004-01-13
申请号：US09545434
申请日：2000-04-07
申请人： Robert W. Heath, Jr. , Peroor K. Sebastian , Rahul Chopra , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Peroor K. Sebastian , Rahul Chopra , Arogyaswami J. Paulraj
IPC分类号： H04L1216
CPC分类号： H04W16/12 , H04B7/0613 , H04B7/2612 , H04W16/02 , H04W16/24 , H04W16/28 , H04W28/12 , H04W36/00 , H04W72/0446 , H04W74/04 , H04W80/00 , H04W84/042 , H04W88/02 , H04W88/08
摘要： The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A subscriber unit for use in a cellular system is disclosed. The subscriber unit includes: spatially separate receivers, a spatial processor, and a combiner. The spatially separate receivers receive the assigned channel composite signals resulting from the spatially separate transmission of the subscriber downlink datastream(s). The spatial processor is configurable in response to a control signal transmitted by the base station to separate the composite signals into estimated substreams based on information obtained during the transmission of known data patterns from at least one of the base stations. The spatial processor signals the base stations when a change of a spatial transmission configuration is required. The combiner combines the estimated substreams into a corresponding subscriber datastream.
摘要翻译：本发明提供了在无线网络中的信息广播期间结合一个或多个多址协议来实现空间复用的方法和装置。公开了一种用于蜂窝系统的用户单元。用户单元包括：空间分离的接收机，空间处理器和组合器。空间分离的接收机接收由订户下行链路数据流的空间分离传输产生的分配的信道复合信号。空间处理器可以响应于由基站发送的控制信号来配置，以基于从至少一个基站传输已知数据模式期间获得的信息将复合信号分离成估计的子流。当需要空间传输配置的改变时，空间处理器向基站发信号。组合器将估计的子流组合成相应的用户数据流。

7. 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.

8. 发明授权

US08418033B2 Mode selection for data transmission in wireless communication channels based on statistical parameters 有权
标题翻译：基于统计参数的无线通信信道数据传输模式选择
公开(公告)号：US08418033B2
公开(公告)日：2013-04-09
申请号：US13076999
申请日：2011-03-31
申请人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H03M13/00
CPC分类号： H04L1/06 , H04L1/0001 , H04L1/0002 , H04L1/0009 , H04L1/0016 , H04L1/0021 , H04L1/0026 , H04L1/0033 , H04L1/20
摘要： A method and communication system for selecting a mode for encoding data for transmission in a wireless communication channel between a transmit unit and a receive unit. The data is initially transmitted in an initial mode and the selection of the subsequent mode is based on a selection of first-order and second-order statistical parameters of short-term and long-term quality parameters. Suitable short-term quality parameters include signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR), power level and suitable long-term quality parameters include error rates such as bit error rate (BER) and packet error rate (PER). The method of the invention can be employed in Multiple Input Multiple Output (MIMO), Multiple Input Single Output (MISO), Single Input Single Output (SISO) and Single Input Multiple Output (SIMO) communication systems to make subsequent mode selection faster and more efficient. Furthermore the method can be used in communication systems employing various transmission protocols including OFDMA, FDMA, CDMA, TDMA.
摘要翻译：一种用于选择用于在发送单元和接收单元之间的无线通信信道中进行数据传输的模式的方法和通信系统。最初以初始模式传输数据，并且随后的模式的选择是基于对短期和长期质量参数的一阶和二阶统计参数的选择。合适的短期质量参数包括信噪比和噪声比（SINR），信噪比（SNR），功率电平和合适的长期质量参数，包括错误率，如误码率（BER）和数据包错误率（PER）。本发明的方法可以用于多输入多输出（MIMO），多输入单输出（MISO），单输入单输出（SISO）和单输入多输出（SIMO）通信系统中，以使后续模式选择更快，更多高效。此外，该方法可以用于采用包括OFDMA，FDMA，CDMA，TDMA的各种传输协议的通信系统。

9. 发明授权

US08339934B2 Spatial multiplexing in a cellular network 有权
标题翻译：蜂窝网络中的空间复用
公开(公告)号：US08339934B2
公开(公告)日：2012-12-25
申请号：US12823057
申请日：2010-06-24
申请人： Robert W. Heath, Jr. , Peroor K. Sebastian , Rahul Chopra , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Peroor K. Sebastian , Rahul Chopra , Arogyaswami J. Paulraj
IPC分类号： H04J11/00
CPC分类号： H04B7/06 , H04B7/0613 , H04B7/2612 , H04B17/309 , H04H20/71 , H04W16/02 , H04W16/12 , H04W16/24 , H04W16/28 , H04W28/12 , H04W36/24 , H04W72/046 , H04W74/04 , H04W80/00 , H04W84/042 , H04W88/02 , H04W88/08
摘要： The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A subscriber unit for use in a cellular system is disclosed. The subscriber unit includes: spatially separate receivers, a spatial processor, and a combiner. The spatially separate receivers receive the assigned channel composite signals resulting from the spatially separate transmission of the subscriber downlink datastream(s). The spatial processor is configurable in response to a control signal transmitted by the base station to separate the composite signals into estimated substreams based on information obtained during the transmission of known data patterns from at least one of the base stations. The spatial processor signals the base stations when a change of a spatial transmission configuration is required. The combiner combines the estimated substreams into a corresponding subscriber datastream.
摘要翻译：本发明提供了在无线网络中的信息广播期间结合一个或多个多址协议来实现空间复用的方法和装置。公开了一种用于蜂窝系统的用户单元。用户单元包括：空间分离的接收机，空间处理器和组合器。空间分离的接收机接收由订户下行链路数据流的空间分离传输产生的分配的信道复合信号。空间处理器可以响应于由基站发送的控制信号来配置，以基于从至少一个基站传输已知数据模式期间获得的信息将复合信号分离成估计的子流。当需要空间传输配置的改变时，空间处理器向基站发信号。组合器将估计的子流组合成相应的用户数据流。

10. 发明授权

US06760882B1 Mode selection for data transmission in wireless communication channels based on statistical parameters 有权
标题翻译：基于统计参数的无线通信信道数据传输模式选择
公开(公告)号：US06760882B1
公开(公告)日：2004-07-06
申请号：US09665149
申请日：2000-09-19
申请人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H03M1300
CPC分类号： H04L1/06 , H04L1/0001 , H04L1/0002 , H04L1/0009 , H04L1/0016 , H04L1/0021 , H04L1/0026 , H04L1/0033 , H04L1/20
摘要： A method and communication system for selecting a mode for encoding data for transmission in a wireless communication channel between a transmit unit and a receive unit. The data is initially transmitted in an initial mode and the selection of the subsequent mode is based on a selection of first-order and second-order statistical parameters of short-term and long-term quality parameters. Suitable short-term quality parameters include signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR), power level and suitable long-term quality parameters include error rates such as bit error rate (BER) and packet error rate (PER). The method of the invention can be employed in Multiple Input Multiple Output (MIMO), Multiple Input Single Output (MISO), Single Input Single Output (SISO) and Single Input Multiple Output (SIMO) communication systems to make subsequent mode selection faster and more efficient. Furthermore the method can be used in communication systems employing various transmission protocols including OFDMA, FDMA, CDMA, TDMA.
摘要翻译：一种用于选择用于在发送单元和接收单元之间的无线通信信道中进行数据传输的模式的方法和通信系统。最初以初始模式发送数据，并且随后的模式的选择是基于对短期和长期质量参数的一阶和二阶统计参数的选择。合适的短期质量参数包括信噪比和噪声比（SINR），信噪比（SNR），功率电平和合适的长期质量参数，包括错误率，如误码率（BER）和数据包错误率（PER）。本发明的方法可以用于多输入多输出（MIMO），多输入单输出（MISO），单输入单输出（SISO）和单输入多输出（SIMO）通信系统中，以使后续模式选择更快，更多高效。此外，该方法可以用于采用包括OFDMA，FDMA，CDMA，TDMA的各种传输协议的通信系统。

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