The power of EM wave will get attenuated as it travels through the air. Therefore, by the time it ends up getting picked up by the receiver, the power level usually is below the detection threshold, as processing of the attenuated signal occupies the majority of the front-end receiver and thus conumes large amounts of energy. Instead of amplification (power), the invention uses chirp conversion technique which takes a chunk of input wave and compresses all the energy into a small space.