Title:
Coexistence of WLAN in a non-licensing radio frequency zone, and LTE
Document Type and Number:
Japanese Patent JP5941566
Kind Code:
B2
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.
Inventors:
Kim, Junsu
Liu, Yong
Rama Mercy, Harish
Liu, Yong
Rama Mercy, Harish
Application Number:
JP2015007984A
Publication Date:
June 29, 2016
Filing Date:
January 19, 2015
Export Citation:
Assignee:
Apple Inc.
International Classes:
H04W16/14; H04W88/02; H04W84/12; H04W88/06
Domestic Patent References:
| JP2010521868A | ||||
| JP2003060553A | ||||
| JP2006157928A |
Foreign References:
| WO2009145326A1 | ||||
| WO2013140930A1 | ||||
| US20090111385 |
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Osamu Shimoyama
Nagakawa Yukimitsu
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Osamu Shimoyama
Nagakawa Yukimitsu