Özet:
Luby Transform (LT) codes which can be
considered as one of the first type of rate less codes are
introduced to be an efficient erasure code. In such codes a
fountain of encoded symbols is continuously transmitted until
the successfully delivery of all the data packets. Whenever the
receiver collects N noisy encoded symbols the decoding
operation starts. Usually belief propagation (BP) algorithm is
used to decipher the code and extract the k data symbols. In
this paper, short length LT codes are generated using efficient
sequential encoding approach (SEA) and performance
measurements have been done over additive white Gaussian
(A WGN) channel. This coding technique generates its degree
in a repeated sequential manner which yields a mutual relation
between adjacent codes that will be used in the decoding part.
The decoding complexity of the proposed structure is similar to
that of the Raptor codes. The simulation results show that the
proposed approach has better performance in terms of error
floor and successful decoding ratio when compared to LT
codes using robust soliton distribution (RSD) and memorybased-RSD (MBRSD) even when supported by belief
propagation-pattern recognition (BP-PR) technique.
