Performance Evaluation of OFDM Systems under PLC Fading Channel over Iraqi Grid for Variable PSK Modulation Index

摘要

There?s always been a rise in demand for the service that requires huge data transmission with high transmission rates. Moreover, this demand increases exponentially which makes mandatory to implement new infrastructural setups to support this new technology in short period of time (<5 years). This makes necessary for service providers and clients to invest on new devices that support new technology. On the other hand, the power lines are very less exploited in the domain of data communication. PLC?s can make use of existing infrastructure to support as a communication medium. For the case study, Iraqi power grid infrastructure is considered in this study. Thus, the power grids are exploited in this study which resembles Iraqi power grid infrastructure to perform high-speed lossless data communication using Multiple Input and Multiple Output-Orthogonal Frequency Division Multiplexing MIMO-OFDM baseband communication techniques. A comparative study is shown with multiple Phase Shift Keying (PSK) modulation indexes to support MIMO-OFDM schemes of transmission over power lines. Furthermore, to achieve higher Signal to Noise Ratio (SNR), Alamouti diversity scheme in the frequency domain is exploited as one of the MIMO configuration of communication over PLC. Thus, the effect of using MIMO-OFDM over PLC is studied and investigated in here with varying modulation index and receiver diversity (Orthogonal Space Frequency Block Coding (OSFBC) as the space frequency diversity is considered for signal modulation.