This paper presents the theoretical analysis, simulation results and suggests\r\ndesign in digital technology of a physical layer for wireless sensor networks. The proposed\r\ndesign is able to mitigate fading inside communication channel. To mitigate fading the\r\nchip interleaving technique is proposed. For the proposed theoretical model of physical\r\nlayer, a rigorous mathematical analysis is conducted, where all signals are presented and\r\nprocessed in discrete time domain form which is suitable for further direct processing\r\nnecessary for devices design in digital technology. Three different channels are used to\r\ninvestigate characteristics of the physical layer: additive white Gaussian noise channel\r\n(AWGN), AWG noise and flat fading channel and AWG noise and flat fading channel with\r\ninterleaver and deinterleaver blocks in the receiver and transmitter respectively. Firstly, the\r\nmathematical model of communication system representing physical layer is developed\r\nbased on the discrete time domain signal representation and processing. In the existing\r\ntheory, these signals and their processing are represented in continuous time form, which is\r\nnot suitable for direct implementation in digital technology. Secondly, the expressions for\r\nthe probability of chip, symbol and bit error are derived. Thirdly, the communication\r\nsystem simulators are developed in MATLAB. The simulation results confirmed\r\ntheoretical findings.
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