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    • 72. 发明申请
    • Method and Arrangements for Estimating IQ-Imbalance
    • 估计智商不平衡的方法和安排
    • US20110243263A1
    • 2011-10-06
    • US12937069
    • 2009-04-08
    • Niklas AndgartLeif Wilhelmsson
    • Niklas AndgartLeif Wilhelmsson
    • H04L27/28H03K9/00
    • H04L27/3863H04L5/0007H04L5/0048H04L5/0066H04L25/0226H04L25/0228H04L25/0236H04L27/2613H04L27/2647
    • 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.
    • 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。
    • 73. 发明授权
    • Cell ID detection in cellular communication systems
    • 蜂窝通信系统中的小区ID检测
    • US07929624B2
    • 2011-04-19
    • US11762379
    • 2007-06-13
    • Bengt LindoffLeif Wilhelmsson
    • Bengt LindoffLeif Wilhelmsson
    • H04K1/10
    • H04L27/2647H04J11/0069H04L27/2613
    • Ascertaining which one of a number of cells of a cellular communication system transmitted an Orthogonal Frequency Division Multiplexing (OFDM) signal involves obtaining reference symbols from the OFDM signal. Compensating phase shift values for phase aligning the plurality of reference symbols are estimated and used to generate phase corrected reference symbols. At least two scrambling code sequences are applied to the phase corrected reference symbols to obtain at least two de-scrambled phase corrected reference symbol sequences, wherein each of the scrambling codes is associated with a respectively different one of the cells of the cellular communication system. A power value of each of the de-scrambled phase corrected reference symbol sequences is ascertained. That one of the scrambling codes that is associated with a highest one of the power values is ascertained, thereby ascertaining which one of the number of cells of the cellular communication system transmitted the OFDM signal.
    • 确定发送正交频分复用(OFDM)信号的蜂窝通信系统的多个小区中的哪个小区中的哪一个涉及从OFDM信号获得参考符号。 用于相位对准多个参考符号的补偿相移值被估计并用于产生相位校正的参考符号。 至少两个扰码序列被施加到相位校正的参考符号以获得至少两个去加扰相位校正的参考符号序列,其中每个扰码与蜂窝通信系统中的分别不同的一个蜂窝相关联。 确定每个解扰相位校正参考符号序列的功率值。 确定与功率值中最高功率值相关联的扰码之一,从而确定蜂窝通信系统的小区数目中的哪一个发送OFDM信号。
    • 75. 发明申请
    • Method and Apparatus for Positioning an FFT-Window in an OFDM-Receiver
    • 用于在OFDM接收机中定位FFT窗口的方法和设备
    • US20110002403A1
    • 2011-01-06
    • US12746518
    • 2008-12-08
    • Leif WilhelmssonLars BjorkmanFrederik Norström
    • Leif WilhelmssonLars BjorkmanFrederik Norström
    • H04L27/28
    • H04L27/2662H04L5/0007H04L25/0216H04L25/022H04L25/0232H04L27/2657H04L27/2665
    • 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.
    • 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。
    • 78. 发明申请
    • Method and a Device for Receiving Data in a Mobile Communication Device in a Broadcast System
    • 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
    • US20100144326A1
    • 2010-06-10
    • US12597217
    • 2008-03-13
    • Leif Wilhelmsson
    • Leif Wilhelmsson
    • H04M3/42H04B1/38H04L27/28
    • H04W76/50G08B25/08G08G1/202
    • 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.
    • 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。
    • 79. 发明申请
    • Adaptive Coexistence Between Different Wireless Communication Systems
    • 不同无线通信系统之间的自适应共存
    • US20090262785A1
    • 2009-10-22
    • US12142175
    • 2008-06-19
    • Leif Wilhelmsson
    • Leif Wilhelmsson
    • H04B1/713H04B15/00
    • H04W16/14H04W88/06
    • 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.
    • 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。
    • 80. 发明授权
    • Initial parameter estimation in OFDM systems
    • OFDM系统中的初始参数估计
    • US07602852B2
    • 2009-10-13
    • US11110840
    • 2005-04-21
    • Anders BerkemanJim SvenssonLeif Wilhelmsson
    • Anders BerkemanJim SvenssonLeif Wilhelmsson
    • H04L27/28
    • H04L27/2657H04L27/2607H04L27/2662H04L27/2678
    • A coarse estimate of a location of an information carrying part of a symbol in a received signal in a telecommunication system is generated. This involves generating correlation values by correlating the received signal with a delayed received signal. A maximum correlation value of the correlation values is identified, and a duration in time during which the correlation values are greater than or equal to a predetermined percentage of the maximum correlation value is identified, wherein the duration in time begins at a first moment in time and ends at a second moment in time. The coarse estimate of the location of the peak correlation value is set equal to a moment in time between the first moment in time and the second moment in time, for example, a midpoint between the first moment in time and the second moment in time.
    • 产生在电信系统中接收信号中承载符号部分的信息的位置的粗略估计。 这涉及通过将接收的信号与延迟的接收信号相关来产生相关值。 识别相关值的最大相关值,并且识别相关值大于或等于最大相关值的预定百分比的时间持续时间,其中时间持续时间从第一时刻开始 并在第二时刻结束。 将峰值相关值的位置的粗略估计设置为等于第一时刻与第二时刻之间的时刻,例如,第一时刻与第二时刻之间的中点。