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

There is provided a wireless device comprising a transmitter (4) for transmitting a Wake-Up Signal (WUS) message m = 0,1, ..., 2^B - 1 in a communication system (100), the transmitter (4) comprising :- a splitter (400) to split the input message m into B_v bits and B_h bits;- A vertical encoder (402) to encode the B_v bits into encoded bits c comprising elements c_i;- a Multi-Carrier On-Off Keying (MC-OOK) modulator (42) to apply a MC-OOK modulation to the encoded bits c, which provides MC-OOK modulated signals s_l,mv for the message m,- a horizontal encoder (404) to encode the B_h bits into an horizontal codeword wmh=w1,mh,w2,mh,…,wL,mh,- a combiner (14) to combine the MC-OOK modulated signals s_l,mv with the horizontal codewords w_l,mh,- a Discrete Fourier Transform (DFT) precoder (44) applying DFT-precoding to the combined sequence s_l,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_l,mv of the MC-OOK modulated signal s_m whenever the corresponding encoded input bit c_i is equal to one, and a value zero otherwise.