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公开(公告)号：US20050105647A1
公开(公告)日：2005-05-19
申请号：US10920928
申请日：2004-08-18
CPC分类号： H04L25/0234 , H04L5/0048 , H04L25/022 , H04L25/0222 , H04L27/2647
摘要： Methods and apparatus that achieve good channel estimation without using unnecessarily complex interpolation filters are described. Adaptive interpolation filtering of a signal in a receiver includes determining at least one correlation function parameter of the channel and determining a filter configuration based on the correlation function parameter. Interpolation filtering is then performed on the signal using the determined filter configuration. The interpolation may be performed in time, where a Doppler frequency shift can serve as the correlation function parameter, or in frequency, where a root mean square or maximum delay spread can serve as the correlation function parameter, or both. A worst case signal-to-noise ratio may be used in determining the filter configuration, or, optionally, the signal-to-noise ratio can determined in real time. The filter configuration can be determined in real time or selected from one of a plurality of predetermined configurations having different complexities.
摘要翻译： 描述了不使用不必要的内插滤波器实现良好信道估计的方法和装置。 接收机中的信号的自适应插值滤波包括确定信道的至少一个相关函数参数，并且基于相关函数参数来确定滤波器配置。 然后使用确定的滤波器配置对信号执行插值滤波。 可以在时间上执行插值，其中多普勒频移可以用作相关函数参数，或频率，其中均方根或最大延迟扩展可以用作相关函数参数，或两者。 可以使用最坏情况的信噪比来确定滤波器配置，或者可选地，可以实时地确定信噪比。 滤波器配置可以实时确定或者从具有不同复杂度的多个预定配置之一中选择。
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公开(公告)号：US07433433B2
公开(公告)日：2008-10-07
申请号：US10920928
申请日：2004-08-18
IPC分类号： H04B1/10
CPC分类号： H04L25/0234 , H04L5/0048 , H04L25/022 , H04L25/0222 , H04L27/2647
摘要： Methods and apparatus that achieve good channel estimation without using unnecessarily complex interpolation filters are described. Adaptive interpolation filtering of a signal in a receiver includes determining at least one correlation function parameter of the channel and determining a filter configuration based on the correlation function parameter. Interpolation filtering is then performed on the signal using the determined filter configuration. The interpolation may be performed in time, where a Doppler frequency shift can serve as the correlation function parameter, or in frequency, where a root mean square or maximum delay spread can serve as the correlation function parameter, or both. A worst case signal-to-noise ratio may be used in determining the filter configuration, or, optionally, the signal-to-noise ratio can determined in real time. The filter configuration can be determined in real time or selected from one of a plurality of predetermined configurations having different complexities.
摘要翻译： 描述了不使用不必要的内插滤波器实现良好信道估计的方法和装置。 接收机中的信号的自适应插值滤波包括确定信道的至少一个相关函数参数，并且基于相关函数参数来确定滤波器配置。 然后使用确定的滤波器配置对信号执行插值滤波。 可以在时间上执行插值，其中多普勒频移可以用作相关函数参数，或频率，其中均方根或最大延迟扩展可以用作相关函数参数，或两者。 可以使用最坏情况的信噪比来确定滤波器配置，或者可选地，可以实时地确定信噪比。 滤波器配置可以实时确定或者从具有不同复杂度的多个预定配置之一中选择。
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公开(公告)号：US20110019749A1
公开(公告)日：2011-01-27
申请号：US12746604
申请日：2008-12-08
申请人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
发明人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
IPC分类号： H04L27/00
CPC分类号： H04L25/022 , H04L5/0048 , H04L25/0232 , H04L27/2647 , H04L27/2662
摘要： Methods for calculating a delay spread estimate in an OFDM-receiver are described, along with computer program products and electronic apparatuses for performing the methods. The methods comprise determining a position of an FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal and using the determined position to obtain a first OFDM-symbol from the received OFDM-signal. An FFT is applied to the first OFDM-symbol to produce an FFT-output signal. A frequency dependent phase rotation component of the FFT-output signal is determined and removed from the FFT-output signal. A number of zero-crossings of at least one of a real component and an imaginary component of a transfer function of a channel, over which the received OFDM-signal has been transmitted, derived from the FFT-output signal where the frequency dependent phase rotation component has been removed is determined, and a delay spread estimate is calculated based on the determined number of zero-crossings.
摘要翻译： 与用于执行方法的计算机程序产品和电子设备一起描述了用于计算OFDM接收机中的延迟扩展估计的方法。 所述方法包括相对于所接收的OFDM信号的一个或多个OFDM符号确定FFT窗口的位置，并使用确定的位置从接收的OFDM信号中获得第一OFDM符号。 对第一OFDM符号应用FFT以产生FFT输出信号。 FFT输出信号的频率相关相位旋转分量被确定并从FFT输出信号中去除。 频率依赖相位旋转的FFT输出信号导出传输函数的传输函数的实数分量和虚分量中的至少一个的多个零交叉 已经去除了分量，并且基于确定的过零点数来计算延迟扩展估计。
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公开(公告)号：US20100272219A1
公开(公告)日：2010-10-28
申请号：US12809710
申请日：2008-12-15
IPC分类号： H04L27/08
CPC分类号： H04L27/2647 , H03G3/3052 , H03G3/3078
摘要： A method and apparatus for adjusting the gain of an amplifier (202) in a communication receiver comprising: estimating the power of a time domain signal (307); estimating the power distribution on one or more sub-carriers of a frequency domain signal (309) transformed from the time domain signal; and generating a gain control signal for the amplifier based on the estimated power of the time domain signal and the power distribution on sub-carriers of the frequency domain signal (311).
摘要翻译： 一种用于调整通信接收机中的放大器（202）的增益的方法和装置，包括：估计时域信号的功率（307）; 估计从时域信号变换的频域信号（309）的一个或多个子载波上的功率分布; 以及基于所述时域信号的估计功率和所述频域信号（311）的子载波上的功率分配来生成用于所述放大器的增益控制信号。
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公开(公告)号：US07680218B2
公开(公告)日：2010-03-16
申请号：US11438874
申请日：2006-05-23
CPC分类号： H04L25/023 , H04L25/0204 , H04L25/022 , H04L27/2608 , H04L27/2647
摘要： A method and apparatus for predicting channel estimates for non-received signal frequencies provides knowledge of propagation channel characteristics for non-received frequencies. One embodiment predicts uplink (or downlink) channel estimates based on measured downlink (or uplink) channel estimates, which is advantageous in systems having different uplink and downlink frequencies. Another embodiment predicts channel responses for non-received OFDM sub carrier frequencies based on measuring channel responses for received OFDM sub carrier frequencies. Such processing may comprise, for example, measuring channel responses for received OFDM pilot sub carriers, predicting channel responses at frequency intervals corresponding to pilot sub carrier spacing, and interpolating between those values to predict channel responses at data sub carrier frequencies.
摘要翻译： 用于预测未接收信号频率的信道估计的方法和装置提供了对于未接收频率的传播信道特性的知识。 一个实施例基于测量的下行链路（或上行链路）信道估计来预测上行链路（或下行链路）信道估计，这在具有不同的上行链路和下行链路频率的系统中是有利的。 另一个实施例基于对接收的OFDM子载波频率的测量信道响应来预测未接收的OFDM子载波频率的信道响应。 这样的处理可以包括例如测量接收的OFDM导频子载波的信道响应，以对应于导频子载波间隔的频率间隔预测信道响应，以及在这些值之间内插以预测数据子载波频率处的信道响应。
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公开(公告)号：US20070092012A1
公开(公告)日：2007-04-26
申请号：US11438874
申请日：2006-05-23
CPC分类号： H04L25/023 , H04L25/0204 , H04L25/022 , H04L27/2608 , H04L27/2647
摘要： A method and apparatus for predicting channel estimates for non-received signal frequencies provides knowledge of propagation channel characteristics for non-received frequencies. One embodiment predicts uplink (or downlink) channel estimates based on measured downlink (or uplink) channel estimates, which is advantageous in systems having different uplink and downlink frequencies. Another embodiment predicts channel responses for non-received OFDM sub carrier frequencies based on measuring channel responses for received OFDM sub carrier frequencies. Such processing may comprise, for example, measuring channel responses for received OFDM pilot sub carriers, predicting channel responses at frequency intervals corresponding to pilot sub carrier spacing, and interpolating between those values to predict channel responses at data sub carrier frequencies.
摘要翻译： 用于预测未接收信号频率的信道估计的方法和装置提供了对于未接收频率的传播信道特性的知识。 一个实施例基于测量的下行链路（或上行链路）信道估计来预测上行链路（或下行链路）信道估计，这在具有不同的上行链路和下行链路频率的系统中是有利的。 另一个实施例基于对接收的OFDM子载波频率的测量信道响应来预测未接收的OFDM子载波频率的信道响应。 这样的处理可以包括例如测量接收的OFDM导频子载波的信道响应，以对应于导频子载波间隔的频率间隔预测信道响应，以及在这些值之间内插以预测数据子载波频率处的信道响应。
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公开(公告)号：US08472538B2
公开(公告)日：2013-06-25
申请号：US12746604
申请日：2008-12-08
申请人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
发明人： Leif Wilhelmsson , Bo Bernhardsson , Lars Björkman
IPC分类号： H04L27/28
CPC分类号： H04L25/022 , H04L5/0048 , H04L25/0232 , H04L27/2647 , H04L27/2662
摘要： Methods for calculating a delay spread estimate in an OFDM-receiver are described, along with computer program products and electronic apparatuses for performing the methods. The methods comprise determining a position of an FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal and using the determined position to obtain a first OFDM-symbol from the received OFDM-signal. An FFT is applied to the first OFDM-symbol to produce an FFT-output signal. A frequency dependent phase rotation component of the FFT-output signal is determined and removed from the FFT-output signal. A number of zero-crossings of at least one of a real component and an imaginary component of a transfer function of a channel, over which the received OFDM-signal has been transmitted, derived from the FFT-output signal where the frequency dependent phase rotation component has been removed is determined, and a delay spread estimate is calculated based on the determined number of zero-crossings.
摘要翻译： 与用于执行方法的计算机程序产品和电子设备一起描述了用于计算OFDM接收机中的延迟扩展估计的方法。 所述方法包括相对于所接收的OFDM信号的一个或多个OFDM符号确定FFT窗口的位置，并且使用所确定的位置从接收的OFDM信号中获得第一OFDM符号。 对第一OFDM符号应用FFT以产生FFT输出信号。 FFT输出信号的频率相关相位旋转分量被确定并从FFT输出信号中去除。 频率依赖相位旋转的FFT输出信号导出传输函数的传输函数的实数分量和虚分量中的至少一个的多个零交叉 已经去除了分量，并且基于确定的过零点数来计算延迟扩展估计。
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公开(公告)号：US08036694B2
公开(公告)日：2011-10-11
申请号：US11721795
申请日：2005-12-19
IPC分类号： H04B7/00
CPC分类号： H04W52/125 , H04W52/08 , H04W52/225 , H04W52/24 , H04W52/246
摘要： A method for generating a power control command in a transceiver in a wireless communication system, where the method comprises the steps of calculating, at the beginning of a predefined time period, a quality measure reference value, generating, repeatedly during the predefined time period, an estimated quality measure value of a signal received at the transceiver; generating a power control command in dependence of the estimated quality measure value and the quality measure reference value; and generating, a number of times during the predefined time period, a modified quality measure reference value from the quality measure reference value. The step of generating the power control command comprises comparing the estimated quality measure value with the modified quality measure reference value. A power control unit, comprising a quality measure estimator, a calculator, a first controller, a second controller and an inner loop element, is configured to implement the method.
摘要翻译： 一种用于在无线通信系统中的收发器中产生功率控制命令的方法，其中所述方法包括以下步骤：在预定时间段开始时，计算质量测量参考值，在预定时间段期间重复生成， 在收发机处接收的信号的估计质量测量值; 根据估计的质量测量值和质量测量参考值产生功率控制命令; 以及在所述预定义时间段内从所述质量测量参考值生成经修改的质量测量参考值的次数。 产生功率控制命令的步骤包括将估计质量测量值与修改的质量测量参考值进行比较。 包括质量测量估计器，计算器，第一控制器，第二控制器和内环元件的功率控制单元被配置为实现该方法。
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公开(公告)号：US08798213B2
公开(公告)日：2014-08-05
申请号：US12682857
申请日：2008-08-27
申请人： Bengt Lindoff , Bo Bernhardsson , Johan Nilsson
发明人： Bengt Lindoff , Bo Bernhardsson , Johan Nilsson
CPC分类号： H04B1/1081 , H04J11/0073 , H04L25/0224 , H04L25/06 , H04L27/2655 , H04L27/2656
摘要： Methods and devices for detecting a symbol in a radio channel and for cell identification are disclosed. A signal is received from the radio channel and the signal is filtered by a filter being responsive to the symbol thereby establishing a first signal. A second signal dependent on the noise floor of the received signal is established—whereby a time interval expected to include multi-path components being excluded or suppressed. A third signal being the ratio between the first signal and the noise floor is established, and the presence of the symbol is detected by detecting a peak in the third signal.
摘要翻译： 公开了用于检测无线电信道中的符号和用于小区识别的方法和装置。 从无线电信道接收信号，并且信号被响应于符号的滤波器滤波，从而建立第一信号。 建立取决于接收信号的本底噪声的第二信号，由此排除或抑制预期包括多路径分量的时间间隔。 确定第一信号和噪声本底之间的比值的第三信号，并且通过检测第三信号中的峰值来检测符号的存在。
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公开(公告)号：US08103219B2
公开(公告)日：2012-01-24
申请号：US12337964
申请日：2008-12-18
申请人： Andres Reial , Bo Bernhardsson , Xiaohui Wang
发明人： Andres Reial , Bo Bernhardsson , Xiaohui Wang
IPC分类号： H04B17/00
CPC分类号： H03J7/02
摘要： The automatic frequency correction value applied by a receiver is altered to minimize long-term drift of a path delay profile. In one embodiment, the phase or timing error resulting from constant frequency corrections is accumulated, and an estimated frequency correction value is selectively quantized into an actual frequency correction value in response to the accumulated phase/timing error. The quantized value above or below the estimate is selected to minimize the accumulated phase/timing error that gives rise to path delay profile drift. In another embodiment, a timing circuit measures the instantaneous path delay profile drift incurred with each frequency correction, and integrates the instantaneous drift measurements over time to yield a path delay profile drift. The drift (or its rate of change) is then used to adjust a frequency correction value so as to minimize the drift.
摘要翻译： 由接收机施加的自动频率校正值被改变以最小化路径延迟分布的长期漂移。 在一个实施例中，累积了由恒定频率校正引起的相位或定时误差，并且响应于累积的相位/定时误差，将估计频率校正值选择性地量化为实际频率校正值。 选择高于或低于估计的量化值以最小化引起路径延迟分布漂移的累积相位/定时误差。 在另一个实施例中，定时电路测量每个频率校正引起的瞬时路径延迟分布漂移，并且随着时间的推移积分瞬时漂移测量值，以产生路径延迟分布漂移。 然后使用漂移（或其变化率）来调整频率校正值，以便使漂移最小化。
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