Performance and Capacity of Cellular OFDMA Systems with Voice over IP Traffic

We propose a methdology to evaluate the VoIP capacity and performance of OFDMA based systems. The approach combines the queueing and the interference analyses to find the delay and power outage. Using this analytical framework, we provide an insight into tradeoffs among capacity limiting factors including channel dimensions, power, interference threshold and latency, and identify techniques for capacity optimization. The numerical demonstrations are carried out on the newly standardized UMB(TM) system. The same methodology can also be applied to UMTS LTE and wireless mobile WiMAX systems.