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On the design of high performance concatenated low density parity check - convolutional codes

Bitla, Shilpa (2012). On the design of high performance concatenated low density parity check - convolutional codes. Master Thesis, Charles Darwin University.

Document type: Thesis
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Author Bitla, Shilpa
Title On the design of high performance concatenated low density parity check - convolutional codes
Institution Charles Darwin University
Publication Date 2012
Thesis Type Master
Subjects 0906 - Electrical and Electronic Engineering
Abstract In communications systems, the unpredictable behaviour of channel poses a great problem in successful transmission of information. According to the Shannon’s theory, the reliability of communication over a noisy channel is improved by implementing a proper error protection technique. This process is called “Channel coding”. Error protection is basically accomplished by two different methods recognized as Forward error correction (FEC) and Automatic repeat request (ARQ). FEC coding is widely used because of simplicity in design compared to ARQ. In this method, number of stuff (parity) bits are added aiming to protect the original information against channel noise. FEC codes are mainly categorized as either block or convolutional codes. Two or more basic codes can be combined with each other to form a reliable and high performance error protection code for the transmission system. Codes constructed by this technique are named concatenated codes. Thesis investigates the performance of concatenated codes constituted by structured Low Density Parity Check (LDPC) and Recursive Systematic Convolutional (RSC) codes, which are linked by an interleaver. LDPC codes are amongst the high performance block codes and introduced as structured or unstructured codes. Structured LDPC codes are well-known codes because of their low encoding complexity and high iterative decoding performance implemented by low number of iterations. In addition, suitable interleaver is presented to optimize the performance of designed concatenated codes. Simulations are also conducted, which confirm the results obtained from the code’s analysis.
 
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Created: Tue, 15 Apr 2014, 10:03:22 CST