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公开(公告)号：US20120082262A1
公开(公告)日：2012-04-05
申请号：US12896994
申请日：2010-10-04
CPC分类号： H04L27/2623 , H04L27/2624
摘要： Techniques are provided for crest factor reduction of a symbol to be transmitted by a communication device. The symbol may be an orthogonal frequency division multiplexed (OFDM) formatted symbol. In a communication device, samples of the symbol are clipped with a clipping level. A signal quality of the symbol is computed after it is clipped. A determination is made as to whether the signal quality satisfies a predetermined criterion. When the signal quality does not satisfy the predetermined criterion, the clipping level is adjusted. The clipping, computing, determining and adjusting operations are repeated until the signal quality satisfies the predetermined criterion. The symbol clipped by the clipping level determined to result in satisfying the predetermined criterion is output for supply to a transmitter in the communication device. Techniques for computing for error vector magnitude that are faster and less computationally intensive are provided, as well as a computation for distortion that can be used as a measure of error vector magnitude.
摘要翻译： 提供技术用于通过通信设备发送的符号的波峰因数降低。 符号可以是正交频分复用（OFDM）格式的符号。 在通信设备中，符号的样本被剪切级别。 符号的信号质量在剪切后计算。 确定信号质量是否满足预定标准。 当信号质量不满足预定标准时，调整限幅电平。 重复削波，计算，确定和调整操作，直到信号质量满足预定标准。 输出被限定为导致满足预定标准的限幅电平的符号，以供给通信装置中的发送器。 提供了用于计算更快更少计算密集度的误差矢量幅度的技术，以及可用作误差矢量幅度的度量的失真计算。
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公开(公告)号：US20130286863A1
公开(公告)日：2013-10-31
申请号：US13459330
申请日：2012-04-30
CPC分类号： H04W16/28 , H04B7/04 , H04B7/0404 , H04L5/001 , H04L5/0039 , H04W72/046 , H04W72/1231
摘要： Techniques are provided to determine whether or not incident power at a wireless communication device in at least two frequency channels is from the same device. Incident power in frequency channels allocated to a basic service set in a wireless network is received at a plurality of antennas of the wireless communication device. Channel state information is computed for at least two frequency channels allocated to the basic service set. One or more metrics are generated based on the channel state information in the two frequency channels. The one or more metrics are evaluated to characterize an uplink signal bandwidth associated with the two channels to determine whether or not the incident power in the two channels is from the same device.
摘要翻译： 提供技术来确定在至少两个频率信道中的无线通信设备处的入站功率是否来自同一设备。 在无线通信装置的多个天线处接收分配给无线网络中的基本业务集的频道中的入局功率。 为分配给基本服务集的至少两个频率信道计算信道状态信息。 基于两个频道中的信道状态信息生成一个或多个度量。 评估一个或多个度量以表征与两个信道相关联的上行链路信号带宽，以确定两个信道中的入局功率是否来自同一设备。
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公开(公告)号：US08090042B2
公开(公告)日：2012-01-03
申请号：US11840788
申请日：2007-08-17
申请人： Mohammad Janani , Ahmadreza Hedayat , Hang Jin
发明人： Mohammad Janani , Ahmadreza Hedayat , Hang Jin
IPC分类号： H04B7/02
CPC分类号： H04B7/0678 , H04L1/0041 , H04L1/0625
摘要： A method is provided for creating an artificial a fast fading channel in a MIMO communication system. The method includes encoding a series of source data to generate a first plurality of encoded output signals and multiplying the first plurality of encoded output signals by a plurality of random complex numbers to generate a second plurality of encoded output signals, and transmitting the second plurality of encoded output signals via the corresponding plurality of antennas. The transmitted signals vary in time and frequency independent of the channel conditions.
摘要翻译： 提供了一种用于在MIMO通信系统中创建人造快速衰落信道的方法。 该方法包括对一系列源数据进行编码以产生第一多个编码输出信号，并将第一多个编码输出信号乘以多个随机复数以产生第二多个编码输出信号，并发送第二多个编码输出信号 通过相应的多个天线编码输出信号。 传输的信号随时间和频率而变化，与信道条件无关。
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公开(公告)号：US09059750B2
公开(公告)日：2015-06-16
申请号：US13298857
申请日：2011-11-17
CPC分类号： H04B7/0413 , H04B7/0617 , H04B7/0671 , H04B7/068
摘要： Techniques are provided to compute downlink beamforming weights for beamforming multiple spatial streams to a wireless device when that wireless device does not transmit with a maximum number of spatial streams, and thus when the full dimensional knowledge of the wireless channel to that wireless device needs to be implicitly derived. Uplink signals are received at a plurality of antennas of a first wireless device that are transmitted via a plurality of antennas of a second wireless device. The first wireless device derives values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device. Downlink beamforming weights are computed from values of consecutive subcarriers across the plurality of antennas of the first wireless device. The first wireless device applies the downlink beamforming weights at respective subcarriers to a number of spatial streams to be transmitted to the second wireless device.
摘要翻译： 当无线设备不以最大数量的空间流传输时，提供技术来计算用于将多个空间流波束成形为无线设备的下行链路波束成形加权，并且因此当无线信道对该无线设备的全维度知识需要是 隐含派生。 在经由第二无线设备的多个天线发送的第一无线设备的多个天线处接收上行链路信号。 第一无线设备在跨越第一无线设备的多个天线的接收信号的多个子载波上导出值。 从第一无线设备的多个天线的连续子载波的值计算下行链路波束赋形权重。 第一无线设备将各个子载波处的下行链路波束成形权重应用于要发送到第二无线设备的多个空间流。
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公开(公告)号：US20110013708A1
公开(公告)日：2011-01-20
申请号：US12503277
申请日：2009-07-15
申请人： Ahmadreza Hedayat , Mohammad Janani , Hang Jin
发明人： Ahmadreza Hedayat , Mohammad Janani , Hang Jin
CPC分类号： H04L7/041 , H04L27/2657
摘要： Energy in a frequency band is received at a wireless communication device and data is generated representing samples of a received time domain waveform from the received energy. Data for groups of samples of the received time domain waveform is processed to transform the data for the received time domain waveform to produce data for an intermediate domain signal that is in neither the time domain nor the frequency domain. The data representing the intermediate domain signal is analyzed to determine whether a sequence having a predetermined pattern from a set of possible sequences is present in the received energy, and ultimately to determine a sequence of the predetermined pattern whose presence is detected in the received energy.
摘要翻译： 在无线通信设备处接收频带中的能量，并且从接收到的能量生成表示接收到的时域波形的采样的数据。 对接收到的时域波形的采样组的数据进行处理，以对接收到的时域波形的数据进行变换，以生成不属于时域和频域的中间域信号的数据。 分析表示中间域信号的数据，以确定在所接收的能量中是否存在具有来自一组可能序列的预定模式的序列，并最终确定在所接收的能量中检测到存在的预定模式的序列。
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公开(公告)号：US08638834B2
公开(公告)日：2014-01-28
申请号：US12503277
申请日：2009-07-15
申请人： Ahmadreza Hedayat , Mohammad Janani , Hang Jin
发明人： Ahmadreza Hedayat , Mohammad Janani , Hang Jin
CPC分类号： H04L7/041 , H04L27/2657
摘要： Energy in a frequency band is received at a wireless communication device and data is generated representing samples of a received time domain waveform from the received energy. Data for groups of samples of the received time domain waveform is processed to transform the data for the received time domain waveform to produce data for an intermediate domain signal that is in neither the time domain nor the frequency domain. The data representing the intermediate domain signal is analyzed to determine whether a sequence having a predetermined pattern from a set of possible sequences is present in the received energy, and ultimately to determine a sequence of the predetermined pattern whose presence is detected in the received energy.
摘要翻译： 在无线通信设备处接收频带中的能量，并且从接收到的能量生成表示接收到的时域波形的采样的数据。 对接收到的时域波形的采样组的数据进行处理，以对接收到的时域波形的数据进行变换，以生成不属于时域和频域的中间域信号的数据。 分析表示中间域信号的数据，以确定在所接收的能量中是否存在具有来自一组可能序列的预定模式的序列，并最终确定在所接收的能量中检测到存在的预定模式的序列。
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公开(公告)号：US20130128935A1
公开(公告)日：2013-05-23
申请号：US13298857
申请日：2011-11-17
CPC分类号： H04B7/0413 , H04B7/0617 , H04B7/0671 , H04B7/068
摘要： Techniques are provided to compute downlink beamforming weights for beamforming multiple spatial streams to a wireless device when that wireless device does not transmit with a maximum number of spatial streams, and thus when the full dimensional knowledge of the wireless channel to that wireless device needs to be implicitly derived. Uplink signals are received at a plurality of antennas of a first wireless device that are transmitted via a plurality of antennas of a second wireless device. The first wireless device derives values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device. Downlink beamforming weights are computed from values of consecutive subcarriers across the plurality of antennas of the first wireless device. The first wireless device applies the downlink beamforming weights at respective subcarriers to a number of spatial streams to be transmitted to the second wireless device.
摘要翻译： 当无线设备不以最大数量的空间流发送时，提供技术来计算用于将多个空间流波束成形为无线设备的下行链路波束成形加权，并且因此当无线信道对该无线设备的全维度知识需要是 隐含派生。 在经由第二无线设备的多个天线发送的第一无线设备的多个天线处接收上行链路信号。 第一无线设备在跨越第一无线设备的多个天线的接收信号的多个子载波上导出值。 从第一无线设备的多个天线的连续子载波的值计算下行链路波束赋形权重。 第一无线设备将各个子载波处的下行链路波束成形权重应用于要发送到第二无线设备的多个空间流。
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公开(公告)号：US08374271B2
公开(公告)日：2013-02-12
申请号：US11956280
申请日：2007-12-13
申请人： Ahmadreza Hedayat , Genyuan Wang , Mohammad Janani , Hanqing Lou
发明人： Ahmadreza Hedayat , Genyuan Wang , Mohammad Janani , Hanqing Lou
IPC分类号： H04B7/02
CPC分类号： H04L1/0625 , H04L1/0071
摘要： The present invention discloses a method for generating a signal stream in a multiple-input-multiple-output (MIMO) channel of a wireless communications system. The method comprises encoding at least one transmitting message into a first signal sequence, transforming the first signal sequence into a second and a third signal sequence by a first and a second predetermined rule, respectively, coupling the second signal sequence to a first antenna, coupling the third signal sequence to a second antenna, transmitting a signal stream comprising the first and second signal sequences to a mobile station.
摘要翻译： 本发明公开了一种用于在无线通信系统的多输入多输出（MIMO）信道中生成信号流的方法。 该方法包括将至少一个发送消息编码到第一信号序列中，分别通过第一和第二预定规则将第一信号序列转换成第二和第三信号序列，将第二信号序列耦合到第一天线，耦合 将第三信号序列发送到第二天线，将包括第一和第二信号序列的信号流发送到移动台。
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公开(公告)号：US20080101437A1
公开(公告)日：2008-05-01
申请号：US11840788
申请日：2007-08-17
申请人： Mohammad Janani , Ahmadreza Hedayat , Hang Jin
发明人： Mohammad Janani , Ahmadreza Hedayat , Hang Jin
IPC分类号： H04B1/713
CPC分类号： H04B7/0678 , H04L1/0041 , H04L1/0625
摘要： A method for providing a fast fading channel in a MIMO communication system is disclosed. The method includes encoding a series of source data to generate a first plurality of encoded output signals and multiplying the first plurality of encoded output signals by a plurality of random complex numbers to generate a second plurality of encoded output signals, and transmitting the second plurality of encoded output signals via the corresponding plurality of antennas, wherein the transmitting signals vary in time and frequency independent of the channel conditions.
摘要翻译： 公开了一种在MIMO通信系统中提供快速衰落信道的方法。 该方法包括对一系列源数据进行编码以产生第一多个编码输出信号，并将第一多个编码输出信号乘以多个随机复数以产生第二多个编码输出信号，并发送第二多个编码输出信号 经由相应的多个天线编码的输出信号，其中发射信号在时间和频率上变化，与信道条件无关。
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公开(公告)号：US09066244B2
公开(公告)日：2015-06-23
申请号：US13459330
申请日：2012-04-30
CPC分类号： H04W16/28 , H04B7/04 , H04B7/0404 , H04L5/001 , H04L5/0039 , H04W72/046 , H04W72/1231
摘要： Techniques are provided to determine whether or not incident power at a wireless communication device in at least two frequency channels is from the same device. Incident power in frequency channels allocated to a basic service set in a wireless network is received at a plurality of antennas of the wireless communication device. Channel state information is computed for at least two frequency channels allocated to the basic service set. One or more metrics are generated based on the channel state information in the two frequency channels. The one or more metrics are evaluated to characterize an uplink signal bandwidth associated with the two channels to determine whether or not the incident power in the two channels is from the same device.
摘要翻译： 提供技术来确定在至少两个频率信道中的无线通信设备处的入站功率是否来自同一设备。 在无线通信装置的多个天线处接收分配给无线网络中的基本业务集的频道中的入局功率。 为分配给基本服务集的至少两个频率信道计算信道状态信息。 基于两个频道中的信道状态信息生成一个或多个度量。 评估一个或多个度量以表征与两个信道相关联的上行链路信号带宽，以确定两个信道中的入局功率是否来自同一设备。
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