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公开(公告)号：US20130208776A1
公开(公告)日：2013-08-15
申请号：US13812619
申请日：2011-07-26
申请人： Jim Svensson , Chester Park , Lars Sundström , Leif Wilhelmsson
发明人： Jim Svensson , Chester Park , Lars Sundström , Leif Wilhelmsson
IPC分类号： H04B17/00
CPC分类号： H04B17/20 , H04B17/0085 , H04L27/2647 , H04L27/364 , H04L27/366
摘要： The invention proposes a way of inserting an analog test signal during normal reception into analog blocks of an OFDM receiver in such a way that the reception is either not corrupted at all, or only very little. This is achieved either by inserting the analog test signal in time or frequency where it does not corrupt the received signal, or by accounting for the interfering analog test signal in the decoding process.
摘要翻译： 本发明提出了一种在正常接收期间将模拟测试信号插入到OFDM接收机的模拟块中的方式，使得接收完全没有被破坏，或者只是很少。 这可以通过在不损坏接收信号的时间或频率插入模拟测试信号，或通过考虑解码过程中的干扰模拟测试信号来实现。
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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：US08072896B2
公开(公告)日：2011-12-06
申请号：US12142175
申请日：2008-06-19
申请人： Leif Wilhelmsson
发明人： Leif Wilhelmsson
摘要： A first transceiver is operated in a first frequency band in the presence of a second transceiver operating in a second frequency band. Operation includes ascertaining an interference level at the first transceiver due to the second transceiver. A coexistence strategy for the second transceiver is dynamically selected by selecting a frequency division strategy if the ascertained interference level is less than a threshold level and selecting a time division strategy if the ascertained interference level is above the threshold level. The second transceiver is then caused to operate in accordance with the dynamically selected coexistence strategy.
摘要翻译： 在第二收发器在第二频带存在的情况下在第一频带中操作，第二收发器在第二频带中工作。 操作包括由于第二收发器确定第一收发器处的干扰电平。 如果确定的干扰电平小于阈值电平，则通过选择频分策略来动态选择第二收发器的共存策略，并且如果所确定的干扰电平高于阈值电平则选择时分策略。 然后使第二收发器根据动态选择的共存策略进行操作。
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公开(公告)号：US20110243263A1
公开(公告)日：2011-10-06
申请号：US12937069
申请日：2009-04-08
申请人： Niklas Andgart , Leif Wilhelmsson
发明人： Niklas Andgart , Leif Wilhelmsson
CPC分类号： H04L27/3863 , H04L5/0007 , H04L5/0048 , H04L5/0066 , H04L25/0226 , H04L25/0228 , H04L25/0236 , H04L27/2613 , H04L27/2647
摘要： An arrangement for estimating IQ-imbalance of a received OFDM-signal is disclosed. The arrangement comprises an FFT-unit (410) adapted to transform the received OFDM-signal to a frequency domain. The frequency domain comprises a plurality of sub-carrier frequencies, and the transformed received OFDM-signal comprises pilot symbols on one or more sub-carrier frequencies and symbols other than pilot symbols on one or more other sub-carrier frequencies. The arrangement also comprises channel estimation circuitry (430, 445), and an IQ-imbalance estimation unit (440) adapted to estimate the IQ-imbalance based on at least one of the pilot symbols, a determined estimated channel value for the sub-carrier frequency of the at least one pilot symbol, an estimate of the transmitted information symbol on the corresponding mirror sub-carrier frequency associated with the at least one pilot symbol and an estimated channel value for the corresponding mirror sub-carrier frequency associated with the at least one pilot symbol. Wherein the corresponding mirror sub-carrier frequency comprises a symbol other than a pilot symbol. A corresponding method and a computer program product are also disclosed.
摘要翻译： 公开了一种用于估计接收的OFDM信号的IQ不平衡的装置。 该装置包括适于将所接收的OFDM信号变换为频域的FFT单元（410）。 频域包括多个子载波频率，并且经变换的接收OFDM信号包括在一个或多个子载波频率上的导频符号和除一个或多个其它子载波频率上的导频符号之外的符号。 该布置还包括信道估计电路（430,445）和适用于基于导频符号中的至少一个估计IQ不平衡的IQ不平衡估计单元（440），用于子载波的确定的估计信道值 所述至少一个导频符号的频率，与所述至少一个导频符号相关联的对应的镜像子载波频率上的所发送的信息符号的估计以及与所述至少一个导频符号相关联的对应的镜像子载波频率的估计信道值 一个导频符号。 其中相应的镜像子载波频率包括除导频符号之外的符号。 还公开了相应的方法和计算机程序产品。
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95.发明授权公开(公告)号：US07903769B2
公开(公告)日：2011-03-08
申请号：US11301100
申请日：2005-12-12
申请人： Anders Wallén , Leif Wilhelmsson
发明人： Anders Wallén , Leif Wilhelmsson
CPC分类号： H04L27/2271 , H04L27/2331 , H04L2027/0067 , H04L2027/0069
摘要： A method and apparatus for compensation of noise in a received signal includes receiving a received signal comprised of a sum of a transmitted signal and a disturbance signal in a demodulator, summing the received signal and a compensation signal to produce a demodulation signal, determining a transmitted symbol based upon the demodulation signal, determining an error signal by calculating a difference between the demodulation signal and the determined transmitted symbol, and determining the compensation signal from the error signal using a model-based disturbance suppression control process. In at least one embodiment, the model-based disturbance suppression control process is a linear disturbance model control process.
摘要翻译： 用于补偿接收信号中的噪声的方法和装置包括在解调器中接收由发射信号和干扰信号之和构成的接收信号，对接收信号和补偿信号进行求和以产生解调信号， 基于解调信号的符号，通过计算解调信号和确定的发送符号之间的差来确定误差信号，以及使用基于模型的干扰抑制控制处理从误差信号确定补偿信号。 在至少一个实施例中，基于模型的干扰抑制控制过程是线性干扰模型控制过程。
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96.发明申请公开(公告)号：US20110002403A1
公开(公告)日：2011-01-06
申请号：US12746518
申请日：2008-12-08
IPC分类号： H04L27/28
CPC分类号： H04L27/2662 , H04L5/0007 , H04L25/0216 , H04L25/022 , H04L25/0232 , H04L27/2657 , H04L27/2665
摘要： Methods for positioning an FFT-window in an OFDM-receiver are disclosed as well as electronic apparatuses and computer program products for performing the methods. The method comprises determining a position of the FFT-window in relation to one or more OFDM-symbols of a received OFDM-signal, using the position of the FFT-window to obtain a first OFDM-symbol from the received OFDM-signal, and applying an FFT to the first OFDM-symbol to produce an FFT-output signal. The method also comprises determining a frequency dependent phase rotation component of the FFT-output signal, and removing the determined frequency dependent phase rotation component from the FFT-output signal to obtain a compensated FFT-output signal. A delay spread estimate is calculated based on at least one of the FFT-output signal and the compensated FFT-output signal, and the position of the FFT-window is adjusted based on at least the determined frequency dependent phase rotation component and the calculated delay spread estimate.
摘要翻译： 公开了在OFDM接收机中定位FFT窗口的方法以及用于执行方法的电子设备和计算机程序产品。 该方法包括使用FFT窗口的位置从接收的OFDM信号中获得第一OFDM符号来确定FFT窗口相对于接收的OFDM信号的一个或多个OFDM符号的位置，以及 对第一OFDM符号应用FFT以产生FFT输出信号。 该方法还包括确定FFT输出信号的频率相关相位旋转分量，以及从FFT输出信号中去除所确定的频率相关相位旋转分量以获得经补偿的FFT输出信号。 基于FFT输出信号和经补偿的FFT输出信号中的至少一个来计算延迟扩展估计，并且至少基于所确定的频率相关相位旋转分量和所计算的延迟来调整FFT窗口的位置 传播估计。
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公开(公告)号：US20100195584A1
公开(公告)日：2010-08-05
申请号：US12365196
申请日：2009-02-04
申请人： Leif Wilhelmsson , Stefan Parkvall , Johan Skold
发明人： Leif Wilhelmsson , Stefan Parkvall , Johan Skold
IPC分类号： H04W72/12
CPC分类号： H04W72/1215 , H04L1/1887
摘要： A communication device has a first transceiver that operates in a first communication system in the presence of a second transceiver that operates in a second communication system that is unrelated to the first communication system. A scheduler of packets for transmission by the first transceiver uses information about when the second communication system will be transmitting a signal that will interfere with reception by the first transceiver, and schedules data for which re-transmission is not essential in those time slots in which an implicit NACK is expected due to the second transceiver's operation.
摘要翻译： 通信设备具有在存在与第一通信系统无关的第二通信系统中操作的第二收发器的情况下在第一通信系统中操作的第一收发器。 用于由第一收发器进行发送的分组调度器使用关于第二通信系统何时将发送将干扰第一收发器的接收的信号的信息，并且在其中的这些时隙中调度重传的数据不是必需的 由于第二收发器的操作，期望隐式NACK。
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公开(公告)号：US20100189203A1
公开(公告)日：2010-07-29
申请号：US12361578
申请日：2009-01-29
申请人： Leif Wilhelmsson , Jan Celander , Lars Sundstrom
发明人： Leif Wilhelmsson , Jan Celander , Lars Sundstrom
IPC分类号： H04L27/08
CPC分类号： H03G3/3078 , H03G3/3068
摘要： A gain control circuit adjusts the signal level of a received signal responsive to the bandwidth a received signal and/or the delay spread of the channel in which the signal has propagated. The bandwidth and delay spread are evaluated to estimate the amount of signal variation that is expected due to fast fading. Adjustments to the signal level are then made to avoid clipping while at the same time ensuring that the dynamic range of a receiver component is efficiently utilized.
摘要翻译： 增益控制电路响应于接收信号的带宽和/或信号已经传播的信道的延迟扩展来调整接收信号的信号电平。 评估带宽和延迟扩展以估计由于快速衰落所预期的信号变化量。 然后进行对信号电平的调整，以避免削波，同时确保接收器组件的动态范围得到有效利用。
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99.发明申请Method and a Device for Receiving Data in a Mobile Communication Device in a Broadcast System 有权用于在广播系统中的移动通信设备中接收数据的方法和设备公开(公告)号：US20100144326A1
公开(公告)日：2010-06-10
申请号：US12597217
申请日：2008-03-13
申请人： Leif Wilhelmsson
发明人： Leif Wilhelmsson
摘要： In a method for receiving data in a mobile communication device (103) in a broadcast system (100) in which an amount of data is transmitted; said mobile communication device (103) comprising a battery (104); wherein the method comprises the step of receiving a part of said amount of data, wherein the method further comprises the step of determining said part of said amount of data based on a charge state of the battery. In this way, the mobile communication device is able to download/receive an amount of data in dependence to an actual condition experienced by said mobile communication device. A condition of the mobile communication device may, in this context be, for example, a reception condition, a power consumption condition, a battery capacity condition, a battery charging condition, etc.
摘要翻译： 一种用于在其中发送数据量的广播系统（100）中的移动通信设备（103）中接收数据的方法; 所述移动通信设备（103）包括电池（104）; 其中所述方法包括接收所述数据量的一部分的步骤，其中所述方法还包括基于所述电池的充电状态来确定所述数据量的所述部分的步骤。 以这种方式，移动通信设备能够根据所述移动通信设备所经历的实际状况来下载/接收数据量。 在这种情况下，移动通信设备的条件可以是例如接收条件，功耗条件，电池容量条件，电池充电条件等。
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公开(公告)号：US20090262785A1
公开(公告)日：2009-10-22
申请号：US12142175
申请日：2008-06-19
申请人： Leif Wilhelmsson
发明人： Leif Wilhelmsson
摘要： A first transceiver is operated in a first frequency band in the presence of a second transceiver operating in a second frequency band. Operation includes ascertaining an interference level at the first transceiver due to the second transceiver. A coexistence strategy for the second transceiver is dynamically selected by selecting a frequency division strategy if the ascertained interference level is less than a threshold level and selecting a time division strategy if the ascertained interference level is above the threshold level. The second transceiver is then caused to operate in accordance with the dynamically selected coexistence strategy.
摘要翻译： 在第二收发器在第二频带存在的情况下在第一频带中操作，第二收发器在第二频带中工作。 操作包括由于第二收发器确定第一收发器处的干扰电平。 如果确定的干扰电平小于阈值电平，则通过选择频分策略来动态选择第二收发器的共存策略，并且如果所确定的干扰电平高于阈值电平则选择时分策略。 然后使第二收发器根据动态选择的共存策略进行操作。
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