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    • 136. 发明申请
    • SYSTEMS AND METHODS FOR CARRIER FREQUENCY OFFSET ESTIMATION FOR LONG TRAINING FIELDS
    • 用于长期训练场的载波频率偏差估计的系统和方法
    • US20160142227A1
    • 2016-05-19
    • US14752050
    • 2015-06-26
    • Qinghua LiXiaogang ChenYuan ZhuRobert Stacey
    • Qinghua LiXiaogang ChenYuan ZhuRobert Stacey
    • H04L25/02H04L27/00H04L27/26
    • H04L25/0226H04L5/0016H04L27/0014H04L27/2675H04L27/34
    • This disclosure describes systems, and methods related to determining carrier frequency offset of a wireless communication channel based on a determined phase difference. In some embodiments, an access point is caused to receive one or more streams comprising one or more encoded long training field (LTF) symbols over the wireless communication channel from one or more user devices. The access point then determines a first phase of the wireless communication channel upon receipt of a first LTF symbol, and determines a second phase of the wireless communication channel upon receipt of a second LTF symbol. The access point next determines a phase difference between the first phase and the second phase. Based on the determined phase difference, the access point determines a carrier frequency offset of the wireless communication channel. Lastly, the access point modifies the wireless communication channel based at least in part on the determined CFO.
    • 本公开描述了基于确定的相位差来确定无线通信信道的载波频率偏移的系统和方法。 在一些实施例中,使得接入点在一个或多个用户设备的无线通信信道上接收包括一个或多个经编码的长训练场(LTF)符号的一个或多个流。 然后,接入点在接收到第一LTF符号时确定无线通信信道的第一阶段,并且在接收到第二LTF符号时确定无线通信信道的第二阶段。 接下来的接入点确定第一阶段和第二阶段之间的相位差。 基于确定的相位差,接入点确定无线通信信道的载波频率偏移。 最后,接入点至少部分地基于所确定的CFO来修改无线通信信道。