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An
Efficient Coding Technique for Aerospace Telecommand system |
The
project had two phases. The first phase consisted of design and implementation
of an encoder for vehicle destruction commands, using the technique of convolutional
encoding. The second phase was a detailed study of turbo coding , the recent addition
to vast arena of coding techniques.The
system being developed was a uniform combination of hardware, software and coding
theory . The basic principle utilizes one of the important coding technique -
the convolutional coding. It is implemented in FPGA, which stands for Field Programmable
Gate Array. The IC used here is Actel 1280XL, which consists of about 8000 logic
gates and memory elements. In order to program the IC , VHDL is used. The VHDL
compiler used was Altera Maxplus II.This
system has the capability of generating convolutional codes with more than one
rate .Code rates of 2/3 and 2/5 are available which can be selected as desired
. This also enables the future development of the system into a turbo code encoder
by introducing an interleaver circuit into it .
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