Performance analysis of MIMO systems for different data traffics

The uses of multiple transmit and receive antennas (MIMO) have received much attention due to its potential to support large capacity in wireless communication systems [1] Recently, the MIMO technology has been under investigation for integrating it with the OFDMA and the MCCDMA systems. In this paper, the performance of multi-cell MIMO-MCCDMA and MIMO-OFDMA systems are evaluated for three different types of users/traffic. This includes (i) high data rate delay-insensitive users, (ii) high data rate delay-sensitive users, and (iii) low data rate voice users [6]. We have made an attempt to evaluate the performance of the two systems based on system Ergodic capacity at various path loss exponents. As path loss is related to the resource allocation, we propose an idea of adaptive resource allocation for different users in two 4G systems. Ideal situation is considered as Zero path loss exponent. In this situation all the users will get resources allocated. The capacity at this path loss is the maximum. Then path loss exponent is varied and capacity is calculated in each case. The ratio of two capacities gives cell loading factor [9] which is simulated and presented here which can be useful to select the best operating parameters for a particular cell in the system.