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公开(公告)号：US07096041B2
公开(公告)日：2006-08-22
申请号：US10296546
申请日：2001-05-17
CPC分类号： H04B7/0634 , H04B7/0617 , H04B7/065
摘要： In a radio communication system, a beam is formed between subscriber stations and a base station which has an antenna device with several antenna elements. The antenna elements emit a downlink signal based on respective weighing with coefficients of a weighting vector. A plurality of weighting vectors are determined at the subscriber station in an initialization phase and transmitted to the base station. In a subsequent working phase, the subscriber station selects a dominant weighting vector from the weighting vectors and transmits a designation of the selected weighting vector to the base station.
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公开(公告)号：US20060104390A1
公开(公告)日：2006-05-18
申请号：US10990910
申请日：2004-11-17
申请人： Nils Graef , Joachim Hammerschmidt
发明人： Nils Graef , Joachim Hammerschmidt
IPC分类号： H03D1/00
CPC分类号： H04L25/03191 , H04B7/0413 , H04L5/0023 , H04L25/0204 , H04L25/0224 , H04L25/0321 , H04L25/03318 , H04L27/2647 , H04L2025/03414 , H04L2025/03426 , H04L2025/03643
摘要： A wireless receiver detects signals generated with a multiple-input, multiple-output (MIMO) transmitter. The receiver applies maximum-likelihood detection (MLD) for soft-output signal detection, where an MLD exhaustive search across all candidate vectors is performed recursively by computing and accumulating the differences between, for example, the Euclidean metrics of consecutive candidate tests. Difference terms used for the accumulation are also calculated recursively. An ordering of candidates, such as by a triangular-waveform shaped ordering, is employed such that only one candidate variable is changed between any two consecutive candidate evaluations, leading to a reduced set of computations.
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公开(公告)号：US20070077969A1
公开(公告)日：2007-04-05
申请号：US11525270
申请日：2006-09-22
CPC分类号： H04L1/0054 , H04L1/06
摘要： Maximum likelihood detection of signals in a MIMO receiver. A system transformation is obtained by selecting a weighting matrix that when linearly transforming a channel utilized for wireless communication, results in a particular transformed triangular matrix. The weighting matrix is then used to provide a transformed vector for a received signal that allows a search in one constellation. In searching the constellation recursion values are used to calculate the Euclidean distances between set points of the constellation and the location on the constellation corresponding to the received signal for both bit values 0 and 1. Minimum Euclidean distances are determined for bit values 0 and 1 and the difference of the minimum Euclidean distances is used to compute the maximum likelihood value for bits contained in the received signal.
摘要翻译： MIMO接收机中信号的最大似然检测。 通过选择加权矩阵获得系统变换，该加权矩阵当线性变换用于无线通信的信道时，得到特定的变换三角矩阵。 然后，加权矩阵用于为允许在一个星座中进行搜索的接收信号提供变换矢量。 在搜索星座递归值时，用于计算星座的设定点与位值0和1对应的接收信号对应的星座上的位置之间的欧氏距离。对于位值0和1确定最小欧几里得距离， 使用最小欧几里德距离的差来计算接收信号中包含的位的最大似然值。
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14.发明申请公开(公告)号：US20060269003A1
公开(公告)日：2006-11-30
申请号：US11141271
申请日：2005-05-31
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L25/06
摘要： Methods and systems are provided for estimating the DC offset distortion in a receiver. A fast Fourier transform is applied to at least a portion of a preamble portion of the received signal; an impact of the DC offset distortion on one or more empty subcarriers is determined; individual DC estimates are derived based on each of the determinations; and each of the individual DC estimates are combined to obtain an overall DC estimate.
摘要翻译： 提供了用于估计接收机中的DC偏移失真的方法和系统。 快速傅里叶变换被应用于接收信号的前导码部分的至少一部分; 确定DC偏移失真对一个或多个空子载波的影响; 基于每个测定得出个体直流估计值; 并且将每个单独的DC估计值组合以获得总体DC估计。
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15.发明申请MLD demapping using sub-metrics for soft-output MIMO detection and the like 有权使用用于软输出MIMO检测的子度量的MLD解映射等公开(公告)号：US20060209994A1
公开(公告)日：2006-09-21
申请号：US11085025
申请日：2005-03-16
申请人： Nils Graef , Joachim Hammerschmidt
发明人： Nils Graef , Joachim Hammerschmidt
IPC分类号： H04L27/06
CPC分类号： H04L25/067 , H04L27/2601 , H04L27/38
摘要： A method for detecting a symbol encoded in one or more received signals, wherein the detected symbol corresponds to a combination of values of n components, n>1, comprises (a) for each of a plurality of different combinations of values of the n components, generating a set of two or more sub-metric values based on the one or more received signals. Each sub-metric is a function of one or more of the n components, and at least one sub-metric is a function of fewer than all n components. The method further comprises (b) detecting the symbol based on the sets of sub-metric values. In another embodiment, an apparatus for detecting a symbol encoded in one or more received signals, wherein the detected symbol corresponds to a combination of values of n components, n>1, comprises (a) means for generating a set of two or more sub-metric values based on the one or more received signals for each of a plurality of different combinations of values of the n components. Each sub-metric is a function of one or more of the n components, and at least one sub-metric is a function of fewer than all n components. The apparatus further comprises (b) means for detecting the symbol based on the sets of sub-metric values.
摘要翻译： 一种用于检测在一个或多个接收信号中编码的符号的方法，其中所述检测到的符号对应于n个分量值n> 1的值的组合，包括（a）对于n个分量的值的多个不同组合中的每一个 基于所述一个或多个接收到的信号产生一组两个或更多个子度量值。 每个子度量是n个分量中的一个或多个的函数，并且至少一个子度量是少于全部n个分量的函数。 该方法还包括（b）基于子度量值集合来检测符号。 在另一个实施例中，一种用于检测在一个或多个接收信号中编码的符号的装置，其中所检测的符号对应于n个分量n> 1的值的组合，包括（a）用于生成一组两个或更多个子 基于用于n个分量的值的多个不同组合中的每一个的一个或多个接收信号的测量值。 每个子度量是n个分量中的一个或多个的函数，并且至少一个子度量是少于全部n个分量的函数。 该装置还包括（b）用于基于子度量值集合来检测符号的装置。
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16.发明申请公开(公告)号：US20050163236A1
公开(公告)日：2005-07-28
申请号：US10990143
申请日：2004-11-16
CPC分类号： H04L1/06 , H04B7/0671
摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system. The disclosed frame structure comprises a preamble having a plurality of long training symbols that are transmitted on a plurality transmit antennas. At least a portion of the frame is delayed on at least one transmit antenna. The disclosed frame formats of the present invention are backwards compatible to existing single antenna communication systems. The delay amount, D, can be approximately equal to one OFDM time sample period, T. The delayed version can be obtained by introducing a time delay into a signal on the delayed branch(es) or by cyclically shifting at least a portion of each frame on the delayed branch(es). The entire frame or only the preamble portion of each frame can be delayed.
摘要翻译： 公开了用于在多天线通信系统中发送符号的方法和装置。 所公开的帧结构包括具有在多个发射天线上发射的多个长训练符号的前同步码。 帧的至少一部分在至少一个发射天线上被延迟。 所公开的本发明的帧格式向后兼容于现有的单一天线通信系统。 延迟量D可以近似等于一个OFDM时间采样周期T.延迟版本可以通过在延迟分支上的信号中引入时间延迟或者通过周期性地移位每个 在延迟分支上的框架。 每个帧的整个帧或仅前导码部分可以被延迟。
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公开(公告)号：US07885324B2
公开(公告)日：2011-02-08
申请号：US12659485
申请日：2010-03-10
CPC分类号： H04B1/406 , H04L25/03127 , H04L25/067
摘要： Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of the equalizer, a plurality of mode/modulation independent post-scalers coupled to the outputs of the soft-slicers, and a mode-dependent coefficient calculator. The coefficient calculator generates parameters for configuring the equalizer, the soft-slicers, and the post-scalers according to the used mode of operation and modulation scheme.
摘要翻译： 提供了用于可重新配置的软输出位解映射，用于不同操作模式（即，不同的发射机/接收机配置）和不同调制方案的可重新配置的方法和系统。 在一个实施例中，可重新配置的软输出位解映射系统包括模式/调制独立均衡器，耦合到均衡器的输出的多个模式/调制无关软限幅器，耦合到 软切片器的输出和模式相关系数计算器。 系数计算器根据使用的操作模式和调制方案产生用于配置均衡器，软分片器和后定标器的参数。
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18.发明授权Methods and systems for calibrating for gain and phase imbalance and local oscillator feed-through 有权用于校准增益和相位不平衡以及本地振荡器馈通的方法和系统公开(公告)号：US07831220B2
公开(公告)日：2010-11-09
申请号：US11396632
申请日：2006-04-04
IPC分类号： H04B1/04
CPC分类号： H04B17/21
摘要： Methods and systems to calibrating a transmitter for I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting DC offsets. The adjusting optionally includes an iterative refinement process. Such a refinement process optionally includes performing a first monitoring, applying a set of relatively coarse settings to the one or more features in the transmitter, monitoring the beating resulting from each of the coarse settings, selecting the coarse setting corresponding the smallest beating, applying a set of relatively fine settings centered around the selected coarse setting, wherein the fine settings are more closely related to one another than are the coarse settings, monitoring the beating resulting from each of the fine settings, and selecting the fine setting corresponding the smallest beating.
摘要翻译： 用于校准发射机以用于I / Q不平衡和本地振荡器馈通的方法和系统包括产生测试音，上变频测试音，监测升高的测试音的一个或多个特征，以及调整一个或多个 变送器的功能响应监控。 该监视可选地包括监视向上转换的测试音的包络的跳动。 在一个实施例中，监视上转换的测试音的一次谐波用于本地振荡器馈通（LOFT）。 或者，对发射机的基带数据输入被禁用，并且通过测量发射机输出端的功率来测量LOFT。 监控上变频测试音的二次谐波，以获得增益和相位不平衡。 该调整可选地包括调整增益不平衡，调整相位不平衡和/或调整DC偏移。 调整可选地包括迭代细化过程。 这样的细化处理可选地包括执行第一监视，将一组相对粗略的设置应用于发射机中的一个或多个特征，监视由每个粗略设置产生的跳动，选择对应于最小跳动的粗略设置，应用 以选择的粗略设置为中心的相对精细设置的集合，其中精细设置比粗略设置彼此更紧密地相关，监视由每个精细设置产生的打击，并且选择对应于最小跳动的精细设置。
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公开(公告)号：US07684479B2
公开(公告)日：2010-03-23
申请号：US11500405
申请日：2006-08-08
CPC分类号： H04B1/406 , H04L25/03127 , H04L25/067
摘要： Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of the equalizer, a plurality of mode/modulation independent post-scalers coupled to the outputs of the soft-slicers, and a mode-dependent coefficient calculator. The coefficient calculator generates parameters for configuring the equalizer, the soft-slicers, and the post-scalers according to the used mode of operation and modulation scheme.
摘要翻译： 提供了用于可重新配置的软输出位解映射，用于不同操作模式（即，不同的发射机/接收机配置）和不同调制方案的可重新配置的方法和系统。 在一个实施例中，可重新配置的软输出位解映射系统包括模式/调制独立均衡器，耦合到均衡器的输出的多个模式/调制无关软限幅器，耦合到 软切片器的输出和模式相关系数计算器。 系数计算器根据使用的操作模式和调制方案产生用于配置均衡器，软分片器和后定标器的参数。
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公开(公告)号：US20070036246A1
公开(公告)日：2007-02-15
申请号：US11500405
申请日：2006-08-08
CPC分类号： H04B1/406 , H04L25/03127 , H04L25/067
摘要： Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of the equalizer, a plurality of mode/modulation independent post-scalers coupled to the outputs of the soft-slicers, and a mode-dependent coefficient calculator. The coefficient calculator generates parameters for configuring the equalizer, the soft-slicers, and the post-scalers according to the used mode of operation and modulation scheme.
摘要翻译： 提供了用于可重新配置的软输出位解映射，用于不同操作模式（即，不同的发射机/接收机配置）和不同调制方案的可重新配置的方法和系统。 在一个实施例中，可重新配置的软输出位解映射系统包括模式/调制独立均衡器，耦合到均衡器的输出的多个模式/调制无关软限幅器，耦合到 软切片器的输出和模式相关系数计算器。 系数计算器根据使用的操作模式和调制方案产生用于配置均衡器，软分片器和后定标器的参数。
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