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Evaluation of computing systems reliability must be accurate enough to provide hints for the required fault protection mechanisms that will guarantee correctness of operation at acceptance costs. To be useful, reliability evaluation must be performed early enough in the design cycle when, however, the available details of the system are largely unknown. This inherent contradiction in terms: early...
This article presents a thorough statistical analysis of the capacity of orthogonal space-time block coded (OSTBC) Nakagami-lognormal (NLN) multiple-input multipleoutput (MIMO) channels. The NLN channel model allows to study the joint effects of fast fading and shadowing on the statistical properties of the channel capacity. We have derived exact analytical expressions for the probability density...
In this paper, we have studied the statistical properties of the capacity of Rice channels for both maximal ratio combining (MRC) and equal gain combining (EGC) schemes. We have analyzed the effect of the number of diversity branches and the amplitude of the line-of-sight (LOS) components in the diversity branches on the statistics of the channel capacity. Specifically, we have derived analytical...
This paper deals with the analysis of statistical properties of the capacity of spatially uncorrelated orthogonal space-time block coded (OSTBC) Nakagami-m multiple-input multiple-output (MIMO) channels. We have derived exact closed-form expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of...
This paper presents a new Discrete Wavelet Transform (DWT) based technique for resolving multipath components in Channel Impulse Response (CIR). CIR is calculated from channel transfer function (CTF) using Inverse Fast Fourier Transform (IFFT). CTF for scattering from building faces modeled semi-deterministically is found using Method of Moments (MoM). As the CTF is calculated in limited frequency...
Amplify-and-forward channels in cooperative networks provide a promising improvement in the network coverage and system throughput. Under line-of-sight (LOS) propagation conditions in such cooperative networks, the overall fading channel can be modeled by a double Rice process. In this article, we have studied the statistical properties of the capacity of double Rice fading channels. We have derived...
This paper deals with the study of the statistical properties of the capacity of Nakagami-lognormal (NLN) channels for various fading environments. Specifically, the impact of shadowing and the severity of fading on the channel capacity is investigated. We have derived analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR),...
This paper studies the statistical properties of the channel capacity of spatially correlated Nakagami-m multiple- input multiple-output (MIMO) channels. We have derived closed- form expressions for the probability density function (PDF), the cumulative distribution function (CDF), the level-crossing rate (LCR), and the average duration of fades (ADF) of the lower bound on the channel capacity. In...
This paper studies the influence of shadowing on the statistical properties of the channel capacity. The problem is addressed by using a Suzuki process as an appropriate statistical channel model for land mobile terrestrial channels. Using this model, exact solutions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration...
Study of radio-wave propagation into and through buildings has become important with the increase in the broadband mobile services. Currently ray tracing and ray launching techniques are used for modeling radio transmission but due to unavailability of detailed building databases, it is not possible to take into account all the edges and discontinuities in the buildings. To overcome this limitation...
Scattering from buildings with doors and windows on the building faces and gaps in between the adjacent buildings is analyzed. Such a building is modelled as randomly distributed conducting screens/strips of finite width and of arbitrary length representing the wall surface and slits representing windows, doors or gaps between the buildings. These randomly distributed strips are illuminated by a line...
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