Gustavo Fraidenraich

Second-order statistics of maximal-ratio and equal-gain combining in Weibull fading

Exact expressions for the level crossing rate and average fade duration of M-branch equal-gain and maximal-ratio combining systems in a Weibull fading environment are presented. The expressions apply to unbalanced, nonidentical, independent diversity channels. In addition, new closed-form solutions for some special cases are obtained.

A Simple Accurate Method for Generating Autocorrelated Nakagami-m Envelope Sequences

We propose a simple accurate method for generating autocorrelated Nakagami-m envelope sequences. The method allows for arbitrary values of fading parameter and nonisotropic fading scenarios. In essence, Nakagami-m samples are first drawn and then rearranged to match the Nakagami-m autocorrelation. The rearrangement is made in accordance with the rank statistics of an underlying Rayleigh reference sequence with the desired autocorrelation. Examples illustrate the excellent performance of the new method

Joint statistics for two correlated Weibull variates

This paper derives closed-form formulas for the joint statistics of two correlated Weibull variates. In particular, the joint probability density function, the general joint moments, and the general correlation coefficient are obtained in terms of well-known fading physical parameters.

On the MIMO channel capacity for the dual and asymptotic cases over Hoyt channels

This paper presents the dual (2times2) MIMO channel capacity over the Hoyt fading channel. The joint eigenvalue distribution of the channel matrix is obtained and it is shown that the effect of the Hoyt parameter b can degrade around 8.5% the channel capacity. For the ttimesr case, an asymptotic result is also derived. All the results are validated by numerical Monte Carlo simulations and are in excellent agreement

Performance analysis of full duplex and selective and incremental half duplex relaying schemes

In this work we compare full-duplex (FD) and half-duplex (HD) relaying in terms of outage probability and throughput. We consider a practical FD relay model where the loop interference between transmitted and received signals is taken into account. We analyze two modes for FD transmission, block Markov encoding and multi-hop transmission without interference cancellation, and two different modes for HD transmission, which are based on selective and incremental decode-and-forward protocols. Results show that there is a tradeoff between SNR and information rate in which each scheme becomes more suitable.

Second-Order Statistics of &#x003B7-&#x003BC Fading Channels: Theory and Applications

In this work, a number of new closed-form expressions for the eta-mu fading channels involving the joint statistics of the envelope, phase, and their time derivatives are obtained. Level crossing rate (LCR), average fade duration (AFD), and phase crossing rate (PCR) are also derived. The expressions are thoroughly validated by reducing them to some particular known cases and, more generally, by means of Monte Carlo simulation. We then provide alternative (i) singlefold integral exact formulations and (ii) highly-accurate approximations to the level-crossing statistics of multibranch maximal-ratio combining (MRC) and equal-gain combining (EGC) systems, respectively, operating over independent Hoyt fading channels, for which the exact solutions appear in the literature in multifold integral forms.

The α-η-μ and α-κ-μ Fading Distributions

In this paper two new fading distributions, the α-η-μdistribution and α-κ-μ distribution, are presented. The α-η-μdistribution includes the α-μ, Nakagami-m, Nakagami-g, Weibull, Hoyt, Rayleigh, Exponential, and the one-sided Gaussian distributions as special cases. The α-κ-μ distribution includes the α-μ, Nakagami-m, Weibull, Rice, Rayleigh, exponential, and the one-sided Gaussian distributions as special cases. Furthermore, it proposes estimators for the involved parameters and uses field measurements to validate the distributions.

Crossing rates and fade durations for diversity-combining schemes over α-μ fading channels

This paper derives exact expressions for the level crossing rate and average fade duration of multibranch pure-selection, equal-gain, and maximal-ratio combiners operating over independent non-identical α-μ (also called generalized Γ or Stacy) fading channels. The derived expressions are in closed form for pure-selection combining and in integral form for equal-gain and maximal-ratio combining. For the two latter schemes, accurate closed-form approximations are then provided. The analytical results are validated by reducing the general expressions to known particular cases and, more generally, by means of simulation. Numerical examples are also given to illustrate the high accuracy of the proposed closed-form approximations.

On the multivariate α-µ distribution with arbitrary correlation

In this paper, an exact new closed formula for the multivariate alpha-mu joint probability density function (PDF) is derived allowing for an arbitrary correlation matrix. In addition, the bit error rate (BER) and the outage probability for the selection combining (SC) technique in a correlated alpha-mu fading channel is obtained.

The /spl lambda/ - /spl mu/ general fading distribution

This paper presents a general fading distribution, the /spl lambda/ - /spl mu/ Distribution. The /spl lambda/ - /spl mu/ Distribution includes the Hoyt, the Nakagami-m, the Rayleigh, and the One-Sided Gaussian distributions as special cases. Field measurement campaigns have been used to validate this new distributions. It has been observed that their fitting to experimental data outperforms that provided by the widely known fading distributions such as Rayleigh, Nakagami-m, and Weibull.