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    • 47. 发明授权
    • MAINTAINING PHASE COHERENCE FOR FREQUENCY OFFSET ESTIMATION
    • 维持相位一致性用于频偏估计
    • EP3033863B1
    • 2017-10-04
    • EP13765812.6
    • 2013-08-16
    • Telefonaktiebolaget LM Ericsson (publ)
    • SORRENTINO, StefanoYANG, YuJÖNGREN, GeorgeHAMMARWALL, David
    • H04L27/26H04L5/00
    • H04L5/0051H04L27/2611H04L27/2657H04L27/2675H04W76/28
    • Techniques for facilitating and performing frequency-offset estimation are disclosed. The disclosed techniques include methods and apparatus for maintaining phase coherence among reference symbols on different transmission-time intervals (TTI) for an accurate estimation of frequency offset. Corresponding techniques utilize channel estimation or measurements of channel-related parameters based on multiple reference symbols belonging to different TTIs. An example method in a radio transceiver for facilitating frequency offset estimation at a remote receiver begins with determining that phase coherence between reference symbol transmissions in a first TTI and a second TTI is required. The radio transceiver selectively maintains phase coherence between reference symbol transmissions in the first and second TTIs, in response to said determining. The radio transceiver then transmits during at least part of a third TTI, following the second TTI, without maintaining phase coherence to the reference symbol transmissions in the first and second TTIs.
    • 公开了用于促进和执行频率偏移估计的技术。 所公开的技术包括用于在不同的传输时间间隔(TTI)上维持参考符号之间的相位一致性的方法和装置,以精确估计频率偏移。 相应的技术利用基于属于不同TTI的多个参考符号的信道估计或信道相关参数的测量。 无线电收发器中用于促进远程接收器处的频率偏移估计的示例方法开始于确定需要第一TTI和第二TTI中的参考符号传输之间的相位一致性。 响应于所述确定,无线电收发器选择性地保持第一和第二TTI中参考符号传输之间的相位一致性。 无线电收发器随后在第三TTI之后的至少部分第三TTI期间发送,而不保持与第一和第二TTI中的参考符号发送的相位一致性。