Design of Transmitter and Receiver to Achieve Ultra-reliability and Low Energy Communication

Abstract

Abstract High reliability and low energy communication are the important requirements for future communication systems. Existing approaches mainly attempted to correct modulated signals using channel estimation or increase signal strength using diversity techniques; the former revealed its limitations in a fast-fading environment, and the latter conflicted with green communication. In our approach, the transmitter transmits a compound signal consisting of a modulated signal and a dummy signal with no bandwidth that belong to the coherence bandwidth. Since the two signals experience approximately the same distortion and noise, the receiver can use a differential operation to remove distortion and suppress background noise. This approach halves the strength of each signal but satisfies the requirements by significantly improving SNR. Experiments using two testbeds, a digital communication platform using FPGA, and a testbed using three WLAN devices, show that our method achieves significantly lower SNR than existing ones at the same BER.