Investigation on Channel Capacity Enhancement for MIMO-OFDM in Fading Channels using Hybrid Water Filling and Nash Algorithm

In this competing wireless communication system, channel capacity is one of the important considerations in promising reliable communication over wireless medium. The demand for channel capacity is increasing from time to time due to the increase of wireless network users. The combination of Multiple Input Multiple Output and Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is a convincing solution to enhance the capacity of different fading channels. However, the channel capacity is still limited by the use of power allocation algorithm. The existing channel capacity is dependent on Water Filling power allocation algorithm. In this paper, a hybrid algorithm of Water Filling and Nash algorithm is proposed and is applied to revise the power allocations to the channels. The proposed method has considered Rayleigh, Rician and Nakagami fading channels in the simulations. The results have shown that the channel capacity is increased significantly in different fading channels by using the proposed method compared to the existing water filling algorithm. In the future, researchers may focus on the improvement of the channel capacity in terms of power allocation method.