Throughput of MC-CDMA multi-cell wireless networks using interference-based sub-carrier group assignment

Two interference-based sub-carrier group assignment strategies in dynamic resource allocation are proposed for MC-CDMA wireless systems to achieve high throughput in a multi-cell environment. Least interfered group assignment (LIGA) selects for each session the sub-carrier group on which the user receives the minimum interference, while best channel ratio group assignment (BCRGA) chooses the sub-carrier group with the largest channel response-to-interference ratio. Both analytical framework and simulation model are developed for evaluation of throughput distribution of the proposed LIGA and BCRGA schemes. An iterative approach is devised to handle the complex interdependency between multi-cell interference profiles in the throughput analysis. Illustrative results show significant throughput improvement offered by the proposed interference-based assignment schemes for MC-CDMA multi-cell wireless systems. In particular, under low loading conditions, LIGA renders the best performance. However, as the load increases BCRGA tends to offer superior performance.