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On the energy detection performance of multi-antenna correlated receiver for vehicular communication using MGF approach

On the energy detection performance of multi-antenna correlated receiver for vehicular communication using MGF approach

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In this work, energy detection-based spectrum sensing for multiple antenna receiver under the effect of mobility is investigated by considering L number of correlated antenna branches. The authors consider the uniform, exponential and arbitrarily correlation among the antenna branches based on the spacing between them. The moment generating function (MGF) approach is applied to obtain the statistical knowledge of the received signal to noise ratio because the Laplace domain behaviour will help to derive the closed-form expressions using simple algebraic operations. They derived the closed-form expressions for the detection probability over Nakagami-m fading, in terms of Lauricella and Confluent Hypergeometric function for maximal ratio combining (MRC) and equal gain combining (EGC) diversity techniques under the effect of vehicle mobility. Monte-Carlo simulation is carried out to validate the derived analytical expressions. The results show that the degradation in detection performance due to fading correlation can be reduced by choosing the appropriate diversity scheme and by increasing the number of antennas. Furthermore, they also found that at high fading parameter () value, the low value of the probability of false alarm and highly correlated fading, MRC works better than EGC for high relative velocity.

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