WLAN AND LTE COEXISTENCE IN UNLICENSED RADIO FREQUENCY BANDS

摘要

PROBLEM TO BE SOLVED: To provide a WLAN device which detects the presence of an LTE wireless communication system without decoding OFDM symbols.SOLUTION: 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 which exceed a peak power threshold value, whose ratio exceeds a ratio threshold, and which are separated by a time period corresponding to the OFDM symbol.