2 research outputs found
Performance Analysis of Energy Detection over Mixture Gamma based Fading Channels with Diversity Reception
The present paper is devoted to the evaluation of energy detection based
spectrum sensing over different multipath fading and shadowing conditions. This
is realized by means of a unified and versatile approach that is based on the
particularly flexible mixture gamma distribution. To this end, novel analytic
expressions are firstly derived for the probability of detection over MG fading
channels for the conventional single-channel communication scenario. These
expressions are subsequently employed in deriving closed-form expressions for
the case of square-law combining and square-law selection diversity methods.
The validity of the offered expressions is verified through comparisons with
results from respective computer simulations. Furthermore, they are employed in
analyzing the performance of energy detection over multipath fading, shadowing
and composite fading conditions, which provides useful insighs on the
performance and design of future cognitive radio based communication systems.Comment: To appear in the IEEE WiMob 2015 conference proceeding
Unified Analysis of Cooperative Spectrum Sensing over Composite and Generalized Fading Channels
In this paper, we investigate the performance of cooperative spectrum sensing
(CSS) with multiple antenna nodes over composite and generalized fading
channels. We model the probability density function (PDF) of the
signal-to-noise ratio (SNR) using the mixture gamma (MG) distribution. We then
derive a generalized closed-form expression for the probability of energy
detection, which can be used efficiently for generalized multipath as well as
composite (multipath and shadowing) fading channels. The composite effect of
fading and shadowing scenarios in CSS is mitigated by applying an optimal
fusion rule that minimizes the total error rate (TER), where the optimal number
of nodes is derived under the Bayesian criterion, assuming erroneous feedback
channels. For imperfect feedback channels, we demonstrate the existence of a
TER floor as the number of antennas of the CR nodes increases. Accordingly, we
derive the optimal rule for the number of antennas that minimizes the TER.
Numerical and Monte-Carlo simulations are presented to corroborate the
analytical results and to provide illustrative performance comparisons between
different composite fading channels.Comment: Submitted to IEEE Trans. Veh. Tech