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Performance Improvement in MIMO-OFDM VLC Systems Through Combined Adaptive Modulation and Coding with Symbol Decomposition

    https://doi.org/10.1142/S0218001424580072Cited by:0 (Source: Crossref)

    In the visible light communication (VLC) system, adaptive symbol decomposition technology is one of the methods to reduce peak-to-average power ratio (PAPR) and suppress LED nonlinear distortion. However, at high symbol variances, there still exists a high PAPR, leading to a higher number of decomposed symbols, which in turn reduces the information rate and increases the bit error rate (BER) performance. Therefore, a combined approach of adaptive modulation, adaptive symbol decomposition serial transmission (ASDST), and space–time block code and orthogonal cyclic matrix transform (STBC-OCT) coding is proposed. The characteristics of PAPR, symbol decomposition and BER under different approaches through Monte Carlo simulation were analyzed. The simulation results show that when using 4-Quadrate Amplitude Modulation (4QAM) modulation and CCDF=2×104, the STBC-OCT-ASDST scheme gains a 5dB improvement compared to ASDST alone. At a BER of 3×102, STBC-OCT-ASDST achieves a 10dBm gain in symbol variance compared to ASDST. Moreover, when the symbol variance of STBC-OCT-ASDST is less than 34dBm, the BER remains below the 7% threshold of forward error correction (FEC) error rate.