Patent ID: 8676150

Claim:
A wake-up method for a multi-channel wake-up receiver, the method comprising: in a first mode of operation, checking for activity on every available channel by switching from one channel to the next thereby cyclically activating and subsequently deactivating one channel after the other in the receiver, wherein activating and subsequently deactivating a channel is realized by activating a respective activity detector of the channel, checking for a carrier signal in the channel, and deactivating the activity detector of the channel; when activity is detected at least on one of the available channels, entering a second mode of operation by switching on all channels by activating all activity detectors and all signal strength measurement units at the same time, measuring a respective received signal strength in every channel and performing a comparison of received signal strengths between all channels; and selecting a channel of the available channels with the highest received signal strength, wherein each channel of the available channels corresponds to a respective antenna mountable to the receiver.