Combined Iterative Demodulation and Decoding using very short LDPC Codes and Rate-1 Convolutional Codes
Thorsten Clevorn, Frank Oldewurtel, Peter Vary · RWTH Publications (RWTH Aachen) · 2005
We propose the serial concatenation of a set of very short LDPC code blocks with components of rate 1.As second component we use a higher order modulation with a sophisticated mapping, a rate-1 convolutional code, or a serial concatenation of both.With this rate-1 component extrinsic information is exchanged between the LDPC code blocks resulting in a very good bit-error rate performance.The LDPC code blocks and each serial concatenation is separately but simultaneously iteratively decoded.Despite its relative low complexity, simulations show a competitive performance of the proposed system, e.g., compared to the UMTS Turbo code or a single, fixed LDPC code.Since the number of LDPC code blocks is flexible, the overall frame size can be adjusted with a high granularity.