A wireless apparatus includes a physical housing, communication circuitry provided in the physical housing, a transmission data inputter provided on the physical housing, and a transmission data generator provided in the physical housing, the transmission data generator including a proximity analyzer configured to detect whether the wireless apparatus is within range of a network; a non-standard preamble pattern generator configured to selectively generate, based on whether the proximity analyzer detects that the wireless apparatus is within range of the network, a data packet preamble having a non-standard preamble pattern in which at least two bits that are adjacent to each other within a series of bits have a same value as each other, and a packet encoder configured to generate data packets including the data packet preamble having the non-standard preamble pattern and raw transmission data.