A wireless device and method for transmitting a wake-up signal

There is provided a wireless device in a communication system, comprising a transmitter (4) configured to transmit a Wake-Up Signal (WUS) message m from an input bit vector b comprising B input bits b_i through a communication channel, the transmitter (4) comprising a set of transmit antennas, and :- a Multi-Carrier On-Off Keying (MC-OOK) modulator (42) applying a MC-OOK modulation to the input bit vector b = [b₀, b₁, ..., b_B-1], which provides a MC-OOK modulated signal s_m for the message m, comprising B elements s_i;- a Discrete Fourier Transform (DFT) precoder (44) applying DFT-precoding to the signal s_m;- a single or multicarrier modulator (46) applying single or multicarrier modulation to the resulting signal S_m output by the DFT-precoder (44),the MC-OOK modulator (42) mapping a ON-signal a comprising K_B elements to each element s_i of the MC-OOK modulated signal s_m whenever the corresponding input bit b_i is equal to one, and a zero value otherwise.