42 research outputs found
On the Computation of the Higher Order Statistics of the Channel Capacity over Generalized Fading Channels
The higher-order statistics (HOS) of the channel capacity
, where denotes the
order of the statistics, has received relatively little attention in the
literature, due in part to the intractability of its analysis. In this letter,
we propose a novel and unified analysis, which is based on the moment
generating function (MGF) technique, to exactly compute the HOS of the channel
capacity. More precisely, our mathematical formalism can be readily applied to
maximal-ratio-combining (MRC) receivers operating in generalized fading
environments (i.e., the sum of the correlated noncentral chi-squared
distributions / the correlated generalized Rician distributions). The
mathematical formalism is illustrated by some numerical examples focussing on
the correlated generalized fading environments.Comment: Submitted to IEEE Wireless Communications Letter, February 18, 201
Impact of Pointing Errors on the Performance of Mixed RF/FSO Dual-Hop Transmission Systems
In this work, the performance analysis of a dual-hop relay transmission
system composed of asymmetric radio-frequency (RF)/free-space optical (FSO)
links with pointing errors is presented. More specifically, we build on the
system model presented in [1] to derive new exact closed-form expressions for
the cumulative distribution function, probability density function, moment
generating function, and moments of the end-to-end signal-to-noise ratio in
terms of the Meijer's G function. We then capitalize on these results to offer
new exact closed-form expressions for the higher-order amount of fading,
average error rate for binary and M-ary modulation schemes, and the ergodic
capacity, all in terms of Meijer's G functions. Our new analytical results were
also verified via computer-based Monte-Carlo simulation results.Comment: 6 pages, 3 figure
Extended Generalized-K (EGK): A New Simple and General Model for Composite Fading Channels
In this paper, we introduce a generalized composite fading distribution
(termed extended generalized-K (EGK)) to model the envelope and the power of
the received signal in millimeter wave (60 GHz or above) and free-space optical
channels. We obtain the first and the second-order statistics of the received
signal envelope characterized by the EGK composite fading distribution. In
particular, expressions for probability density function, cumulative
distribution function, level crossing rate and average fade duration, and
fractional moments are derived. In addition performance measures such as amount
of fading, average bit error probability, outage probability, average capacity,
and outage capacity are offered in closed-form. Selected numerical and computer
simulation examples validate the accuracy of the presented mathematical
analysis.Comment: Composite fading distribution, generalized-K distribution,
probability density function, cumulative distribution function, fractional
moments, level crossing rate, amount of fade duration, moments, amount of
fading, average bit error probability, average capacit