EFFICIENT RESOURCE ALLOCATION IN MC-CDMA CELLULAR WIRELESS NETWORKS TO SUPPORT MULTIMEDIA TRAFFIC
Dhananjay Kumar, Chenniappan Chellappan · 2009
The Multi Carrier Code Division Multiple Access (MC-CDMA) system with time division duplex mode, adopting unbalanced slot allocation between uplink and downlink, is a good solution for asymmetric multimedia traffic. A centralized common slot allocation to minimize inter-cell interference is not feasible as neighboring cells may carry different rates of traffic load. In this paper, we investigate and discuss the effect of asymmetric slot management strategy employing adaptive resource allocation in a MC-CDMA system, in which each cell has its own slot allocation policy according to the level of traffic load. The Bit Error Rate (BER) and Signal to Noise Ratio (SNR) of MC-CDMA considering four cases of uplink and downlink between cells is simulated separately in presence of Additive White Gaussian Noise (AWGN) and Rayleigh channel. The simulation result shows that the distance ratio and orthogonality factor are equally important parameter in BER performance, and also an SNR of around 9dB is enough to bring BER below 10-3.