In this work, we describe an LDPC code design framework for the unequal power two-user Gaussian multiple access channel using EXIT charts. We show that the sum-rate of the LDPC codes designed using our proposed method can get close to the maximal sum-rate of the two-user Gaussian multiple access channel. Moreover, we provide numerical simulation results that demonstrate the excellent finite-len...

Distal colonic K(+) excretion is determined by the balance of K(+) absorption and K(+) secretion of the enterocytes. K(+) secretion occurs via active basolateral K(+) uptake mostly via the NKCC1 co-transporter followed by K(+) exit via a luminal K(+) channel. The specific focus here is directed towards the luminal secretory K(+) channel (1). Several recent observations highlight the pivotal rol...

A method to construct bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) is developed that approaches the Shannon limit very closely at high spectrum efficiency, where amplitude-phase shift keying (APSK) constellations are designed and chosen. For 1/2-rate 64APSK, the Es/N0 threshold derived through extrinsic information transfer (EXIT) charts is less than 0.55 dB ...

This work deals with coding systems based on sparse graphs. The key issue we address is the relationship between iterative (in particular belief propagation) and maximum a posteriori decoding. We show that between the two there is a fundamental connection, which is reminiscent of the Maxwell construction in thermodynamics. The main objects we consider are EXIT-like functions. EXIT functions wer...

The discovery of Turbo Codes in 1996 by Berrou et. al. proved to be a huge boost for the research of channel coding. The Turbo Principle behind turbo codes was found to be applicable in other areas. One of these areas is Multiuser Detection. In this thesis, Turbo Multiuser Detection is investigated in order to answer two main questions. The questions concern the performance gain that is obtaine...

A typical extrusion of low and medium strength aluminium alloys solid shapes is performed with flat pocket dies. The pocket allows realising the extrusion as “billet-to-billet” process, and also facilitates filling-up die channel deadlocks and thin-walled elements of profile [1]. In addition it serves as an instrument for shape geometry control. The scientific literature contains a variety of r...

This paper introduces a new concept for the magnetic field in a Hall-effect thruster. The Magnetic Interference Hall Accelerator (MIHA) uses independent magnetic circuit elements to put its peak magnetic field outside its exit plane. As a result, the zone of minimum electron mobility is outside its exit plane, as well as its ion acceleration zone. Wall-effects are reduced, and ion bombardment o...

Abstract The article presents qualitative data on the study of process diffusion combustion during outflow a gas jet from nozzle apparatus with certain arrangement nozzles. is round straight channel and coaxially located annular slot. In experiments, hydrogen or methane was supplied through an slot, air central circular micro nozzle. main features are revealed comparison processes carried out. ...

We consider cold collisions of OH molecules in the P3/2 ground state, under the influence of a magnetic field. We find that modest fields of several thousand gauss can act to suppress inelastic collisions of weakfield-seeking states by two orders of magnitude. We attribute this suppression to two factors: sid an indirect coupling of the entrance and the exit channel, in contrast to the effect o...