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This paper investigates the impact of concatenation of an interleaved low density parity check (LDPC) code with convolutional channel coding on the performance of the space time block coded (STBC) orthogonal frequency-division multiplexing (OFDM) wireless communication system on text message transmission. The concatenated channel encoded OFDM system deploys various digital modulations (BPSK, QPSK and QAM) over an additative white gaussian noise (AWGN) and other fading (Raleigh and Rician) channels. Computer simulation results on bit error rate (BER) demonstrate that the 1/2-rated convolutional and LDPC channel encoded OFDM system outperforms with BPSK modulation technique as compared to other digital modulation schemes and the system is highly effective to combat inherent interferences under AWGN, Rayleigh and Rician fading channels. The BER performance of the concatenated channel encoded OFDM system with 1/2-rated channel coding is better as compared to 3/4rated channel coding. The transmitted text message is found to have retrieved effectively under noisy and fading situations. It is anticipated from the BER simulations that the performance of the communication system degrades with the increase of noise power.

Performance Analysis of a Concatenated LDPC Coded Alamouti-Based STBC-OFDM System on Text Message Transmission