Abstract:
In this paper the theoretical model and simulation of the physical layer for wireless sensor networks (WSNs) application is presented. The spreading sequences used are generated from the chaotic generators design using Chebyshev maps that increases the security in signal transmission. Signal propagation in WSNs assumes heavy influence of fading and inter-symbol interference. To mitigate this fading influence the application of chip interleaving technique is applied. For the case of fading presence in the channel and the case of interleaver application, the theoretical expressions for the bit error rate (BER) in closed form are derived. The system simulators are developed that confirmed theoretical findings. The signal processing procedures in the transmitter and receiver blocks are presented in discrete time domain that makes the design of devices directly implementable in DSP technology, which was one of the aims of this research.
