Padding for wakeup radio (WUR) packets

A wireless communication device, comprising:

• a network interface device associated with a first communication device, wherein the network interface device comprises one or more integrated circuit (IC) devices configured to:
• generate a first portion of a wakeup radio (WUR) packet, wherein the first portion of the WUR packet corresponds to a WLAN legacy PHY preamble of the WUR packet, and
• generate a second portion of the WUR packet, including:
• generating the second portion of the WUR packet to include a WUR packet PHY sync signal, wherein the WUR packet PHY sync signal corresponds to a sync bit sequence with each bit in the sync bit sequence modulated by a sync waveform, the sync waveform corresponding to a time-truncated orthogonal frequency division multiplexing (OFDM) symbol with at least some two alternating subcarriers set to non-zero power values and subcarriers between the at least some two alternating subcarriers set to zero power,
• generating the second portion of the WUR packet to include a PHY data portion, and
• generating the second portion of the WUR packet to include a padding signal, wherein the padding signal corresponds to a padding bit sequence with each bit in the padding bit sequence modulated by the sync waveform;
• wherein the network interface device comprises one or more transceivers implemented on the one or more IC devices, the one or more transceivers configured to transmit the WUR packet.