Research On The Robust Interference Alignment In WOMIMO Systems

To improve the rate of wireless communication systems, optical wirelessmultiple-in and multiple-out (WOMIMO) systems is attractive in researchers for itshigh communication rate and long distance transmission. There are still problemsneed solved to apply the WOMIMO system in the actual communication channelstate, including the interference between multiple users and the imperfect channelstate information (CSI). This article is mainly about the interference managementand control scheme research through the turbulence environment with imperfect CSIin multi-user WOMIMO systems.We study the relationships in an atmospheric turbulence channel between thesystem capacity, user number and the initial spatial coherent length of the beam inmulti-user WOMIMO systems. To verify the feasibility of applying the interferencealignment in multi-user WOMIMO systems, we analysis the application condition ofinterference alignment scheme and proof it effective by simulating in WOMIMOconstruction with3traditional interference alignment scheme of radio frequencywireless communication system. We analysis the influence of the imperfect CSIfactor to the performance of WOMIMO systems using interference alignments. TheMMSE interference alignment gains higher sum rate with perfect CSI and lowerrobustness with imperfect CSI. The Max SINR interference alignment has highestrobustness than the others with imperfect CSI and the least sum rate with perfectCSI.We establish a mixed interference alignment based on MMSE and Min WLIassimilating with the MMSE interference alignment and the Min WLI interferencealignment. Considering the design of the Max SINR interference alignment and theMin WLI interference alignment and digesting the game theory, we introduce aninterference alignment scheme based on extra potential game (EPG) with analternative weighted parameter expressing the overall sum rate. The mixedinterference alignment based on MMSE and Min WLI gains higher sum rate than theEPG interference alignment in multiple WOMIMO system with perfect CSI. And themixed interference alignment based on MMSE and Min WLI is more robust thanany other traditional interference alignment with imperfect CSI.