The issue of the mean signal level crossing rate for various probability density functions with primary relevance for optics is discussed based on a new analytical method. This method relies on a unique transformation that transforms the probability distribution under investigation into a normal probability distribution, for which the distribution of mean level crossings is known. In general, t...

In this paper, we provide a unified analysis of average symbol error probability (SEP) for a diversity system over generalized gamma fading channels, which is a generalization of Rayleigh, Nakagami, and Ricean fading channels. We consider independent generalized gamma fading on the diversity branches and derive different closed-form expressions of the average SEP for a general class of M -ary m...

In this paper, a novel general small-scale fading model for wireless communications, that describes the nonhomogeneous nature of the propagation medium, is introduced. Its probability density function (PDF) is given by a simple, exact, and closed-form expression. Namely, the η − λ− μ includes the λ− μ, the η − μ, the Gamma, the Exponential, the Hoyt, the Nakagami-m, the Rayleigh, and the One-Si...

This letter takes a new approach to extract a closed-form expression for the bit error rate (BER) of direct-sequence ultra wideband (DS-UWB) system. In the analysis, the main signal is impaired by multi-user interference (MUI) and an external source of interference originated by simultanously transmitting multiband orthogonal frequency division multiplexing (MB-OFDM) systems which are located i...

In this paper, we propose an online SNR estimation scheme for generalized fading channels. We derive the SNR estimate based on a statistical ratio of observables over a block of data, when the channel undergoes Nakagami fading. An online SNR estimator for AWGN channels has been derived recently by Summers and Wilson. Our SNR estimation scheme in this paper is for a general Nakagami fading chann...

Resumo—Este artigo apresenta uma expressão exata e em forma fechada para a distribuição conjunta da envoltória e fase para o ambiente de desvanecimento κ-μ, um modelo de desvanecimento generalizado que inclui como casos especiais os modelos de Rice e Nakagami-m. As estatı́sticas conjuntas são obtidas em compatibilidade com os casos particulares de Rice e Nakagami-m. Simulações de Monte Carlos sã...

In this paper, we present an efficient technique for the BER of OFDM system over Nakagami–m fading channels, using well known characteristics function based analysis approach. The average BER expressed in terms of the higher transcendental function such as the confluent hyper geometric functions. Our numerical results show that depending on the number of channel taps, the BER performance may de...

The results of spectral efficiencies for optimum rate adaptation with constant transmit power (ORA) and channel inversion with fixed rate (CIFR) schemes over uncorrelated diversity branch with Selection Combining (SC) available so far in literature are not applicable for Nakagami-0.5 fading channels. This paper derived closed-form expressions for the spectral efficiency of dual-branch SC over u...

In this paper, the performance of space-time coding scheme is investigated over Nakagami fading channels. In the first part, the performance of super-orthogonal space-time trellis code is presented while the performance of its concatenated version is presented in the second part. The concatenation coding scheme with iterative decoding involves convolutional code as the outer code and super-orth...