Please don't use Wifi. Wifi doesn't refer to all radio communications, Wifi specifically refers to IEEE standard 802.11.

The TPMS systems do not use Wifi, nor do they generally transmit in the 2.4 GHz band. The system from the paper you mention sits at 315 MHz.

The paper is available here: http://www.winlab.rutgers.edu/~Gruteser/papers/xu_tpms10.pdf