1 research outputs found
Higher Order Statistics in Switched Diversity Systems
We analyze the level crossing rate (LCR) and the average fade duration of the
output signal-to-noise-ratio (SNR) in generalized switched diversity systems.
By using a common approach, we study these higher order statistics for two
different kinds of configurations: (1) Colocated diversity, i.e. receiver
equipped with multiple antennas, and (2) Distributed diversity, i.e. relaying
link with multiple single-antenna threshold-based decode-and-forward (DF)
relays. In both cases, we consider the switched diversity combining strategies
Selection Combining and Switch \& Stay Combining (SSC). Whenever using
threshold-based techniques such as DF or SSC, the output SNR is a discontinuous
random process and hence classic Rice approach to calculate the LCR is not
applicable. Thus, we use an alternative formulation in terms of the one and
two-dimensional cumulative distribution functions of the output SNR. Our
results are general, and hold for any arbitrary distribution of fading at the
different diversity branches. Moreover, we develop a general asymptotic
framework to calculate these higher order statistics in high mean SNR
environments which only needs of the univariate probability density function