In this paper, we investigate a coded OFDM system employing an iterative receiver, which is a serial concatenation of an inner and outer component decoder. The inner component decoder includes pilot and data aided channel estimation (CE) and demodulation whereas the outer component decoder consists of the decoder. Between these two components extrinsic loglikelihood ratio values of the code bit...

A novel source coding scheme based on turbo codes was presented in [1]. Lossless data compression is thereby achieved by puncturing data encoded with a turbo code while checking the integrity of the reconstructed information during compression. In this paper we apply code optimization tools to serially concatenated turbo source codes. The goal of the optimization is to minimize the area of the ...

recent developments in nanostructured products draw considerable attention to ultrafine grained materials. these materials are normally manufactured by different severe plastic deformation (spd) methods. in the present study, analytical models and finite element method (fem) are used to calculate strain imposed to a specimen that was deformed by equal channel angular pressing (ecap). in additio...

A simple numerical model is presented to predict the steady-state ice layers on the cooled walls inside a parallel plate channel for arbitrary entrance velocity profiles. The effect of two different entrance velocity distributions (a parabolic velocity distribution and a slug flow) on the shape of the ice-layers are examined. The quality of an approximative solution given in literature was chec...

Cold drawing is a commonly used metal forming technique carried out by pulling billet through die cavity to obtain desired dimensions. Ideally, the cross-sectional area of drawn product should be equal that at its exit; however, former one always larger after drawing, in practice. In this study, cold an AISI-316 stainless steel rod investigated finite element analysis. The difference between ra...

Production of lightweight metals with a higher strength to weight ratio is always the main goal of researchers. In this article, equal channel multi angular pressing (ECMAP) process as one of the most appealing severe plastic deformation (SPD) methods on production of ultra-fine grained (UFG) materials studied. Two main routes A and C investigated by FEM and compared with each other from differ...

In this paper, the geodesics of an open multiply connected hyperbolic manifold are presented from dynamical system point view. The approach is completely numerical. Similar to closed case there a zero-measure set periodic orbits. difference that now, most escape infinity through one topologically distinct channels, and initial conditions identified which channel orbit escapes. condition mesh re...

A microfluidic passive pumping method relying on surface tension properties is investigated and a physical model is developed. When a small inlet drop is placed on the entrance of a microfluidic channel it creates more pressure than a large output drop at the channel exit, causing fluid flow. The behavior of the input drop occurs in two characteristic phases. An analytical solution is proposed ...

We present a brief review of recent advances in string cosmology. Starting with the Dilaton-Moduli Cosmology (known also as the Pre Big Bang), we go on to include the effects of axion fields and address the thorny issue of the Graceful Exit in String Cosmology. This is followed by a review of density perturbations arising in string cosmology and we finish with a brief introduction to the impact...

This paper investigates when two abstract logic-based argumentation systems are equivalent. It defines various equivalence criteria, investigates the links between them, and identifies cases where two systems are equivalent with respect to each of the proposed criteria. In particular, it shows that under some reasonable conditions on the logic underlying an argumentation system, the latter has ...