Optimum Transmission Power for Diversity Based Receiving System in Wireless Sensor Network with Nakagami Fading

Abstract

The sensor nodes in a Wireless Sensor Network (WSN) usually perform their assigned jobs with the help of a limited power supply (i.e. battery power). The lifetime of a sensor node is directly proportional to battery power. It is required to restrict the unnecessary consumption of power which is mostly associated with the transmission of a signal. In this paper, we compute the minimum power required to make a successful data transmission (referred to as optimum transmission power) so that the BER (Bit Error Rate) concerning the received signal at the destination node must satisfy the threshold level. Further, to improve the SNR (Signal to Noise Ratio) we consider the most commonly used MRC (Maximal Ratio Combiner) diversity based receiving system as a part of node architecture. To characterize the multipath fading scenario the generalized Nakagami channel is used for deriving the required mathematical expressions.