Performance Evaluation of Serially Concatenated LDPC and Reed-Solomon Codes for OFDM Systems

Document Type : Original Article

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Egyptian Armed Forces, Egypt.

Abstract

Both high quality and high-bit-rate transmission’ are critical demands for recent mobile communication system. In this multipath environment OFDM has been proven as an attractive technique. As errors can still occur in the received data; channel coding is a key component is these systems. Since its reintroduction, Low-Density Parity-Check (LDPC) codes have gained much attention in the field of coding theory. Several researches have been carried out regarding concatenating the LDPC with other codes. This work introduces the use of serial concatenation of Reed-Solomon and LDPC. Two schemes of such concatenation will be investigated. The first one uses hard decision decoding of Reed-Solomon code while the other one will get use of the reliability output of the LDPC decoder to be fed to Chase-II softdecision algorithm to decode the outer Reed-Solomon code.

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