Avoiding false detection associated with wake-up signal

A wireless transmitter comprising a controller, wherein the controller is configured to cause the wireless transmitter to:

• transmit, during a time interval, a signal comprising first and second signal parts over a frequency range comprising non-overlapping first and second frequency intervals, wherein:
• the first signal part is transmitted in the first frequency interval and has a first autocorrelation value;
• the second signal part is transmitted in the second frequency interval;
• and
• the signal comprising the first and second signal parts has a second autocorrelation value that is lower than the first autocorrelation value.

A non-transitory computer readable medium having stored thereon a computer program comprising program instructions that, when executed by a controller, cause a wireless transmitter to:

• transmit, during a time interval, a signal comprising first and second signal parts over a frequency range comprising non-overlapping first and second frequency intervals, wherein:
• the first signal part is transmitted in the first frequency interval and has a first autocorrelation value;
• the second signal part is transmitted in the second frequency interval;
• and
• the signal comprising the first and second signal parts has a second autocorrelation value that is lower than the first autocorrelation value.