Wake-up signal waveform design

A wake-up signal waveform generator, comprising:

• at least one memory configured to store computer program code;
• and
• at least one processor configured to access the at least one memory and operate as instructed by the computer program code, the computer program code including:
• receiving code configured to cause the at least one processor to receive a plurality of input samples;
• a performing code configured to cause the at least one processor to perform, on the plurality of input samples, subcarrier mapping that maps the plurality of input samples to a set of subcarriers, thereby generating a subcarrier mapper output;
• a first generating code configured to cause the at least one processor to generate first orthogonal frequency-division multiplexing (OFDM) signal by mapping at least a portion of the subcarrier mapper output to a first frequency band, wherein the first frequency band has a predetermined correspondence to a first wake up signal symbol;
• a second generating code configured to cause the at least one process to generate a second OFDM signal by mapping at least a portion of the subcarrier mapper output to a second frequency band, different from the first frequency band, wherein the second frequency band has a predetermined correspondence to a second wake up signal symbol;
• and
• a third generating code configured to cause the at least one process to generate a wake up signal comprising at least a portion of the first OFDM signal to represent the first wake up signal symbol and at least a portion of the second OFDM signal to represent the second wake up signal symbol.

A non-transitory computer readable medium having instructions stored therein, which when executed by a processor in wake-up signal waveform generator cause the processor to execute a method comprising:

• receiving plurality of input samples;
• performing, on the plurality of input samples, subcarrier mapping that maps the plurality of input samples to a set of subcarriers, thereby generating a subcarrier mapper output;
• generating a first orthogonal frequency-division multiplexing (OFDM) signal by mapping at least a portion of the subcarrier mapper output to a first frequency band, wherein the first frequency band has a predetermined correspondence to a first wake up signal symbol;
• generating a second OFDM signal by mapping at least a portion of the subcarrier mapper output to a second frequency band, different from the first frequency band, wherein the second frequency band has a predetermined correspondence to a second wake up signal symbol;
• and
• generating a wake up signal comprising at least a portion of the first OFDM signal to represent the first wake up signal symbol and at least a portion of the second OFDM signal to represent the second wake up signal symbol.