  Wireless signals are commonly used for communications. Emerging applications
are giving new functions to wireless signals, in which wireless sensing is the
most attractive one. Channel state information (CSI) is not only the parameter
for channel equalization in communications but also the indicator for wireless
sensing. However, due to the broadcast nature of wireless signals,
eavesdroppers can easily capture legitimate user signals and violate user
privacy by measuring CSI. Moreover, the advancement of hardware simplifies
illegal eavesdropping since smart devices can track over-the-air signals
through walls. Therefore, this work considers a waveform-defined privacy (WDP)
solution that can hide CSI phase information and therefore protect user
privacy. Besides, the proposed waveform solution achieves better performance
due to the use of a unique modulation mechanism. Additionally, by tuning a
waveform parameter, the waveform can also enhance communication security.

Signal Processing;Cryptography and Security