Energy efficient communications for wireless sensor networks with enhanced gateway

Machine to machine (M2M) communication networks are designed to enable communications between an ultra-low power low-cost wireless sensor mote and the overall access network. Given such asymmetric constraints involved in M2M communications (M2MCs) design, effective communication techniques should aim to minimize the overall energy consumed in the sensor mote. We consider a M2M network with an enhanced sensor gateway (ESG), where the ESG is designed to compensate for the performance limitations at the sensor mode. We consider an energy efficient signaling technique at the mote and design spreading codes that enable the use of a low-complexity detector at the ESG. Additionally, we propose algorithms at the ESG to compensate for frequency offset at the wireless sensor mote. We observe that our joint frequency offset compensation and low complexity detection performs reasonably (less than 1.5 dB worse than) close to a perfect setup and the optimal detector.