CPC H04B 1/1607 (2013.01) [H04B 1/18 (2013.01); H04B 2001/307 (2013.01)] | 20 Claims |
1. A wake-up receiver comprising:
a sub-sampler configured to:
receive a radio frequency, RF, signal at any of a plurality of RF frequencies;
receive from a local oscillator a first oscillating signal having a first oscillator frequency; and
sub-sample, using the first oscillating signal, the received RF signal in order to generate and output a sub-sampled signal;
a signal processing system coupled to an output of the sub-sampler and configured to:
receive the sub-sampled signal from the output of the sub-sampler;
demodulate the sub-sampled signal; and
recover from the demodulated sub-sampled signal a digital code that is encoded within the RF signal; and
a wake-up assertion entity configured to:
compare the digital code to one or more predetermined wake-up codes; and
when the digital code matches any of the one or more wake-up codes, output a wake-up assertion signal.
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