公开(公告)号：US20150208253A1

公开(公告)日：2015-07-23

申请号：US14502790

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Yong Liu ,  Harish Ramamurthy

IPC: H04W24/02 ,  H04L27/26 ,  H04W72/08 ,  H04W16/14

CPC classification number: H04W24/02 ,  H04L5/001 ,  H04L27/0006 ,  H04L27/2614 ,  H04W16/14 ,  H04W74/0808

Abstract: A wireless local area network (WLAN) device processes received samples for a radio frequency channel in an unlicensed radio frequency band to detect radio frequency interference from a long term evolution (LTE) wireless communication system. The WLAN device performs a correlation of received time-domain samples to detect the presence of a cyclic prefix for an orthogonal frequency division multiplexing (OFDM) symbol used by the LTE wireless communication system. The WLAN device searches for cross-correlation peaks (1) that exceed a peak power threshold value, (2) that a ratio of which exceed a ratio threshold, and (3) that are separated by a time period corresponding to the OFDM symbol. The WLAN device detects the presence of the LTE wireless communication system without decoding the OFDM symbols.

Abstract translation: 无线局域网（WLAN）设备处理非许可射频频带中的射频信道的接收样本，以检测来自长期演进（LTE）无线通信系统的射频干扰。 WLAN设备执行接收的时域采样的相关性，以检测LTE无线通信系统使用的正交频分复用（OFDM）符号的循环前缀的存在。 WLAN设备搜索超过峰值功率阈值的互相关峰值（1），（2）其比率超过比率阈值，和（3）被与OFDM符号相对应的时间间隔分隔开。 WLAN设备在不解码OFDM符号的情况下检测LTE无线通信系统的存在。