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    • 5. 发明公开
    • Correction of frequency offsets greater than the Nyquist frequency
    • Korrektur eines Frequenzversatzes,dergrösserals dies Nyquist Frequenz ist
    • EP2224658A1
    • 2010-09-01
    • EP09153947.8
    • 2009-02-27
    • Telefonaktiebolaget L M Ericsson (publ)
    • Andgart, NiklasAlriksson, PeterAxmon, JoakimJöngren, GeorgeLindoff, Bengt
    • H04L27/26
    • H04L27/2686H04L27/2657H04L2027/0065
    • There is disclosed a method of estimating frequency offset of a received signal in a terminal apparatus operating in a wireless communication system. The method comprises a) determining a phase change between a first and a second reference symbol of the received signal, wherein the time distance t between the first and the second reference symbols is associated with an observation frequency f such that f =1/ t ; b) determining a preliminary frequency offset Δ f based on the determined phase change, wherein the preliminary frequency offset Δ f form a frequency offset hypothesis Δ f h ; c) decoding at least a part of the received signal, with application of the frequency offset hypothesis Δ f h , to a decoded signal; d) determining whether the decoded signal is a successful decoding, wherein if the decoded signal is a successful decoding, determining the frequency offset hypothesis Δ f h to be the estimated frequency offset, and if the decoded signal is not a successful decoding, adjusting the frequency offset hypothesis Δ f h , by an integer n times the observation frequency f such that Δ f h = Δ f + n · f, where n ∈ [+/- 1, 2, 3, ...], and repeating steps c) and d). Computer program, frequency controller, and terminal apparatus are also disclosed.
    • 公开了在无线通信系统中操作的终端装置中估计接收信号的频率偏移的方法。 该方法包括:a)确定接收信号的第一和第二参考符号之间的相位变化,其中第一和第二参考符号之间的时间距离t与观测频率f相关联,使得f = 1 / t; b)基于确定的相位变化确定初步频率偏移“f”,其中初步频率偏移“f形成频率偏移假设”f h; c)通过对解码信号应用频率偏移假设“f h”来解码接收信号的至少一部分; d)确定解码信号是否是成功解码,其中如果解码信号是成功解码,则确定频偏假设“fh”作为估计频率偏移,并且如果解码信号不是成功解码,则调整频率 偏移假设“fh,乘以观察频率f的整数n,使得”fh =“f + n·f,其中n [+/- 1,2,3,...]和重复步骤c)和 D)。 还公开了计算机程序,频率控制器和终端装置。
    • 9. 发明公开
    • Technique for cell signature determination
    • 技术zur Zellsignaturbestimmung
    • EP2391081A1
    • 2011-11-30
    • EP10005427.9
    • 2010-05-25
    • Telefonaktiebolaget L M Ericsson (PUBL)
    • Axmon, JoakimAndgart, NiklasBadagandi, SrinivasKlein, OliverLipka, Dietmar
    • H04L27/26
    • H04W48/16H04J11/0073H04J11/0076H04J11/0086H04L27/2656H04L27/2662H04L27/2675
    • A technique for cell signature determination in a cellular communication network is provided. A method implementation of this technique comprises the steps of providing a set of hypothesis signals, each hypothesis signal including a signature hypothesis, receiving a composite signal including a first signal portion carrying a first signature from a first cell and a second signal portion carrying a second signature from a second cell, wherein the first signal portion and the second signal portion overlap at least partially in time, and obtaining a correlation result by correlating the composite signal with each hypothesis signal. After the first signature has been determined, a set of phantom signatures associated with the first signature is provided. The phantom signatures represents artifacts from the first signal portion in the correlation result. Finally, the second signature is determined based on the correlation result taking into account the set of phantom signatures associated with the first signature.
    • 提供了一种在蜂窝通信网络中进行小区签名确定的技术。 该技术的方法实现包括以下步骤:提供一组假设信号,每个假设信号包括签名假设,接收包括携带来自第一小区的第一签名的第一信号部分和承载第二信号的第二信号部分的合成信号 签名,其中所述第一信号部分和所述第二信号部分至少部分地在时间上重叠,并且通过将所述复合信号与每个假设信号相关来获得相关结果。 在确定了第一签名之后,提供与第一签名相关联的一组幻影签名。 幻影签名表示相关结果中来自第一信号部分的伪影。 最后,基于与第一个签名相关联的一组幻影签名的相关结果来确定第二签名。