Article
Concatenated LDPC-based STBC-OFDM System with MRC Receivers Performances
This paper analyses the reliability of a concatenated Space-Time Block Coding Orthogonal Frequency Division Multiplexing (STBC-OFDM) system implemented with Maximum Ratio Combining (MRC) receivers and Low-Density Parity-Check (LDPC) coded. The proposed system integrates spectrum efficiency of OFDM, spatial diversity of STBC and error-correcting properties of LDPC codes in order to enhance reliability of communication in fading channels. MRC receivers allow optimum combining of received signals on many antennas and thereby maximise signal-to-noise ratio. Compared with the traditional non-concatenated systems (and MRC systems), simulation results indicate significant improvements in bit error rate (BER) performance in a variety of channels. As per the research, the combined effects of LDPC coding, STBC, OFDM and MRC help in the successful reduction of multipath fading and noise effects and this makes the system best fit in high data rate wireless communications applications.
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