## 1 Introduction  
Due to the growth in science and engineering technology, the performance of electronic equipment related to aircraft has advanced and hardware/software standards have been studied to minimize related cost [1]. Generally avionics electronic equipment and components are connected by a wire to communicate between each other. However, there are major disadvantages regarding fuel efficiency, maintenance, and so on. Furthermore, it may lead to potential problems for safety, which increases according to the scale of the aircraft. Therefore, a wireless communication scheme needs to substitute for the existing wire communication scheme [2; 3; 4; 5]. For example, a large-sized aircraft has more than 40,000 sensor nodes and a medium-sized aircraft has more than 6000 sensor nodes, which means that the number of wires connected for communication increases according to the scale. Thus, the weight of the airplane will increase proportionally. Furthermore, the cost to install the wire has increased substantially and maintenance costs can be regularly incurred. Finally, the safety problem by aging wires should be considered. To prevent these kinds of problems, related research has progressed [6; 7; 8; 9; 10]. The performance by using a wireless communication scheme in an aircraft can be degraded during flights because of weather conditions, such as lightning, snow, and so on. In addition, an aircraft is equipped with a lot of antennae for Automatic Dependent Surveillance-Broadcast (ADS-B), Aircraft Communications Addressing and Reporting System (ACARS), Airborne Satellite Communications (SATCOM), etc. functions. Thus, when the wireless communication is used some interference can happen because of weather conditions and a lot of antennae from sensors. So, to overcome the interference, among sensors and subsystems beamforming and cooperative schemes are known [11; 12]. Cooperative schemes use virtual directivity by deploying at least one relay and beamforming uses the maximum-directivity factor by applying array antenna. Furthermore, the wireless sensor nodes use battery storage, which means that the nodes have energy limitation. Thus, checking energy consumption performance needs when one of transmission schemes is applied to the aircraft wireless sensor networks [13]. For the wireless sensor communication standard ITU (International Telecommunication Union) and ICAO (International Civil Aviation Organization) are collaborating with ASVI (Aerospace Vehicle Systems Institute) and NASA (National Aeronautics and Space Administration), etc. to adopt the international standard of aircraft wireless sensor networks. Furthermore, a frequency band for the aircraft wireless sensor networks is allocated at the WRC (World Radio-Communication Conference) [14]. Technology candidates of the standard that can be used for the networks are IEEE 802.15.4 [15], IEEE 802.11 [16], and IEEE 802.15.1 [17], etc. Thus, the eight introduced schemes of this paper can be used based on a standard that will be adopted in future. Recent research works related to a wireless sensor network for an aircraft show that the energy supply for the wireless sensor node is mainly supplied by battery [9], so it has energy-related restriction. In addition, the wireless sensor nodes can not be reused again when the battery life is over, which means that costs increase further due to running out of energy coverage holes that are caused, which means that performance decreases. Thus, to enhance energy efficiency by applying efficient scheme to the wireless sensor network of an aircraft is important factor. [PERSON], et al. [13] show that the main challenge for the avionics wireless networks is the network lifetime. In addition, as the authors represent interrelationship among critical system variables, the key metrics which are the message delay, the message dropout, the packet delay, and the packet loss can be converged to the energy consumption performance. [PERSON], et al. [18] represents wireless sensor networks for the next-generation avionic system.