Research On High Reliability Channel Coding Of MIMO-PLC

In order to further explore the potential of Power Line Communication(PLC)and increase the channel capacity of the PLC system,Multiple-Input Multiple-Output(MIMO)technology has been introduced into the traditional PLC system.Although the MIMO-PLC system can increase the transmission rate and anti-interference ability of the system by virtue of the additional transmission gain,the high correlation and complex noise of the PLC system channel still restrict the further improvement of the PLC performance.Based on the analysis of the disadvantageous conditions of channel transmission,the research of high-reliability MIMO-PLC system is carried out from the perspective of channel coding.First,completed the construction of the MIMO-PLC system transmission model and channel noise model based on the real channel conditions of the PLC channel.Based on this,the PLC system channel capacity under the four transmission port configurations of SISO,MISO,SIMO,and MIMO is simulated and analyzed.The results show that the PLC system obtains the maximum channel capacity gain in the MIMO mode,which verifies the performance superiority of the selected system transmission model.Secondly,combined with the analysis of system performance gains under the spatial multiplexing and space-time diversity coding and decoding strategies,the difference in system transmission performance under the space-time diversity and spatial multiplexing coding and decoding strategies is studied,and the results show that the transmission rate of the MIMO-PLC system under the spatial multiplexing coding strategy can reach twice that of the space-time diversity mode coding strategy,but the system performance of the space-time diversity coding strategy is better in terms of transmission reliability and decoding complexity.After that,through the analysis of the relevant characteristics of the channel attenuation parameters of the MIMO-PLC system,this paper completed the design of the phase rotation precoding scheme for the MIMO-PLC spatial multiplexing system,focusing on deriving the corresponding precoding matrix phase rotation angle calculations under different channel attenuation parameters the formula and simulation experiments are carried out.After the simulation verification,the code distance of the receiving end of the system after the precoding processing has been adjusted,so that the system bit error rate under the medium and high signal-to-noise ratio environment is significantly reduced.Finally,in order to further reduce the impact of the complex noise environment of the PLC channel on the MIMO-PLC system,the Gold sequence is selected to perform spread spectrum processing on the transmitted signal sequence,and on this basis,the MIMO-PLC direct sequence spread spectrum system under QPSK modulation is completed.The simulation results show that the anti-noise performance of the MIMO-PLC system after spread spectrum processing has been significantly improved,and it has shown good adaptability in the PLC channel environment where the noise environment is relatively harsh.