Evaluation of Low-density parity-check code with 16-QAM OFDM in a time-varying channel

In wireless networks, multipath interference in a time-varying channel is a significant and major challenge to effective data transmission. Bit error rate (BER) efficiency is improved using Forward Error Correction (FEC) coding, such as Low-Density Parity-Check (LDPC) coding. LDPC, which can accomplish near Shannon limit efficiency and has recently gained considerable attention because of these properties. The efficiency of an LDPC coded orthogonal frequency division multiplexing (OFDM) communication scheme for time-varying channels is evaluated in this paper. Then we study the bandwidth-efficient coded modulation system based on LDPC codes that have low implementation complexity and high BER efficiency. Simulation is used to investigate the effects of modulation and coding schemes on the performance of the LDPC code.The results show that the device can significantly boost the efficiency of wireless channels while lowering the code rate and improving overall system performance.