13-03-2012, 04:41 PM
Analysis and Design of Interleave-Division Multiple-Access in
Labview Software.
Abstract _Autosaved_.pdf (Size: 71.69 KB / Downloads: 42)
Introduction to Labview:
LabVIEW (short for Laboratory Virtual Instrumentation Engineering
Workbench) is a platform and development environment for a visual
programming language from National Instruments. The purpose of
such programming is automating the usage of processing and
measuring equipment in any laboratory setup.
The graphical language is named "G" (not to be confused with G
code). Originally released for the Apple Macintosh in 1986,
LabVIEW is commonly used for data acquisition, instrument control,
and industrial automation on a variety of platforms including
Microsoft Windows, various versions of UNIX, Linux, and Mac OS
X. The latest version of LabVIEW is version LabVIEW 2011,
released in August 2011.
Dataflow programming
The programming language used in LabVIEW, also referred to as G,
is a dataflow programming language. Execution is determined by the
structure of a graphical block diagram (the LV-source code) on which
the programmer connects different function-nodes by drawing wires.
These wires propagate variables and any node can execute as soon as
all its input data become available. Since this might be the case for
multiple nodes simultaneously, G is inherently capable of parallel
execution. Multi-processing and multi-threading hardware is
automatically exploited by the built-in scheduler, which multiplexes
multiple OS threads over the nodes ready for execution.
Introduction to IDMA:
It outlined several new developments related to Interleave-division
multiple access(IDMA). Here analysis and optimization techniques,
superposition-coded modulation, frequency domain processing
schemes and applications of IDMA in multiple output, relay and ad
hoc enviroments can be discussed. IDMA has flexibility. It show that
IDMA principle can be applied to realize many potential performance
gains highlighted by information theory, including coding gain,
diversity gain and multi-user gain. It demonstrate these gain can be
very high, ranging a few to tens Dbs, comared with conventional
approaches.
IDMA TRANSMITTER AND RECEIVER PRINCIPLES
The discussion in Section 2 points to simplifying the EMUD and
minimizing the FEC coding rate. Fig. shows transmitter and (iterative)
receiver structures based on these principles, incorporating the work
developed in . Since interleaving is the only mechanism for user
separation here, it is referred to as interleave-division multiple-access
(IDMA).