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Tham khảo tài liệu 'artificial intelligence for wireless sensor networks enhancement part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Cooperative Clustering Algorithms for Wireless Sensor Networks 169 the thermal noise floor is 99dBm the receiver noise figure is 14dB and a signal-to-noise ra-tio SNR is at least 28dB to receive the signal with no errors. Thus the minimum receive power Pr-thresh for successful reception is Pr-thresh 57dBm. With that the cross-over distance dco is 86.4m. And in 7 efs and etr are 3 X 10 12J bit m2 and 4 X 10 16J bit m4 respectively. Furthermore the ARM Advanced RISC Machine architecture is widely used in embedded designs. For power saving features ARM CPUs are dominant in wireless sensor networks where low power consumption is a critical design goal. In recent years the new version of ARM has been successfully used for many years in a wide range of wireless device application. Building on the Cortex foundation the processor achieves performance of 2.0DMIPS MHz low power of 0.5mW MHz and speed up to 1GHz. Thus we assume that the energy consumption of per bit data aggregation Eda is 0.1nJ bit. For our simulation we assume that 100 sensor nodes are dispersed into the 100m X 100m area with 5 clusters and the simulation is finished when the rate of sensor nodes alive is less than 0.1. Fig. 7. Lifetime and data capacity Fig. 8. Energy efficiency 170 Smart Wireless Sensor Networks 5.2 Analysis of simulation results In this section we introduce the results of simplex scenario while the initial energy of a sensor node is 1J and the position of base station is 50 175 . In our simulation we use the number of sensor nodes transmission times defined as the sum of transmission times for each sensor node to represent the data transmission capacity. The effect of capacity of data transmission on the time is shown in Fig. 7. As illustrated in this figure both in CGC and EEDBC the network lifetimes are greatly prolonged more than that of LEACH about 25 . Typically however the final number of sensor nodes transmission times is increasing up to 24.5 and 21.6 compared with LEACH and .
