METHOD AND APPARATUS FOR INDICATING THE PRESENCE OF A WIRELESS LOCAL AREA NETWORK BY DETECTING ENERGY FLUCTUATIONS.

摘要

This invention relates to the field of communication systems. More particularly, this invention is a method and system for detecting the presence of a wireless local area network. With reference to Fig. 3, the WLAN front end (204) comprises an RF filter (302), a low noise amplifier (306), a mixer (310), a phase-locked loop circuit (314), a band pass filter (318), an automatic gain control circuit (322), and an in-phase and quadrature demodulator (326). In operation, an RF signal propagating in a wireless local area network frequency band is coupled to the low noise amplifier (306) from the RF filter (302).