Research On Energy-efficient Coding Scheme Of Wireless Nanosensor Networks

With the fast development of nanotechnology, it becomes practical to make sensors with the nanometer-level size. Wireless nanosensor networks(WNSNs) consisting of nanosensors have a lot of important applications, such the in-body drug release system and the air pollution monitoring. WNSNs are a new emerging type of sensor networks. The research on this new topic not only has the theoretical value, but also has important practical application value on the long run.As the nanosensor battery has very limited amount of energy, communication energy consumption is one of important performance metrics to be considered when designing communication techniques. To address this problem, some literature has presented some low-weight code for on-off keying(OOK) based WNSNs to reduce the communication energy consumption. Transmitting the encoded date rather than the original data can effectively reduce the energy consumption of transmitters. However, the design of theses codes does not take into account the energy consumption of receivers, and also the problem of codeword self-synchronizing. For the OOK-based WNSNs, this paper presents the following two codes to reduce the communication energy consumption:1) The optimal fixed-length code designed by considered the energy consumption of both the transmitter and receiver. As its design takes into account both transmitting energy consumption and receiving energy consumption, this code can effectively reduces the total energy consumption.2) The self-synchronizing variable-length code. On one hand, this code can cope with the case that a received packet has one or more codeword errors, avoiding the retransmission of correct codewords; on the other side, this code has low average codeword weight. Due to these two features, this code can effectively reduce the energy consumption.Numerical results show that these two proposed codes can effectively reduce the communication energy consumption of WNSNs.