Modeling and characterization of multi-rate direct sequence CDMA system using dynamic resource allocation scheme

In this paper the resource allocation problem in multirate direct-sequence code division multiple access (DS-CDMA) has been discussed. A spectral efficiency maximization algorithm for a CDMA system comprising of variable bit rate (VBR) groups has been proposed here. The developed algorithm is capable to utilize the available radio resources efficiently to maximize the spectral efficiency of the system. The power of each group is dynamically controlled to minimize the cell interference thereby enhancing the system capacity. A mathematical model is also developed to estimate the effect of voice activity factor and antenna sectorization on dynamic resource allocation. The proposed model shows significant improvement in bandwidth utilization. The Bit Error Rate (BER) performance of the above model is also measured in presence of Gaussian Noise and Rayleigh fading.