Capacity improvements of MCCDMA-MIMO system through power control using water filling game theory under imperfect channel state conditions

The MCC DMA-MIMO, a system of Multi Carrier Code Division Multiple Access (MC-CDMA) technique with multiple antennas at both the transmitter and receiver gets benefits of ability to adopt multiple access capability from MCCDMA technique, achieves high data rate from MIMO concepts and becomes a very attractive multiple access technique for the future wireless communication systems. However, the performances of system are subjected to limiting factors such as Multiple-Access Interference (MAI) and Inters Carrier Interference (ICI). So, the interference mitigation methodology in the MCDMA-MIMO system has received a lot of attention in next generation mobile environment. The power control and sub carrier grouping methods have been long standing open solutions for capacity enhancement. The strategic choice of assigning the transmission power to each individual subcarrier in the MCCDMA-MIMO system is subjected to the knowledge of Channel State Information (CSI), which usually becomes imperfect due to the time varying nature of the channels. The goal of this paper is to allocate proper power to sub-carriers of MCCDMA-MIMO system by playing water filling game theory against the CSI errors to improve the capacity of the system.