Wireless Networks have a great potential over wired networks and the foremost on the list is its mobility which almost frees us from the cabling culture. In addition tomobility, advantages like flexibility, affordable deployment, faster and easier access makes these networks most sought after. Though the advantages are countless but these networks pose different challenges for network protocol designers. The major constraint of wireless networks is their limited resources especially energy. This paper explores different optimization techniques at physical layer of OSI stack in order to extend the network lifetime of wireless networks. Simulation results indicate that the proposed optimization techniques enhanced the network lifetime to a considerable length.