TITLE:
Performance Enhancement of Grouped MCCDMA-MIMO System through Power Control Using Water Filling Game Theory under Imperfect Channel State Condition
AUTHORS:
Sundhar Arumugam, Dananjayan Perumal
KEYWORDS:
CSI, IWFA, MCCDMA-MIMO, MAI, QoS
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.7 No.10,
October
27,
2014
ABSTRACT: Continuous
increase in demand of wireless services such as voice, data and multimedia is
fueling the need of spectrally efficient techniques in communication networks.
The MCCDMA-MIMO, a system of Multi Carrier Code Division Multiple Access
(MCCDMA) 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. But, the wireless channels in MCCDMA-MIMO networks are known to
display significant variations across active users’ subcarriers as well as
among subcarriers of the same user due to simultaneous spectrum utilization.
This leads to the undesirable Multiple-Access Interference (MAI) and Inters
Carrier Interference (ICI), accordingly degrades the performance of the system.
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
performance of the system.