Downlink Subcarriers Required Analysis for Two-Hop OFDMA Cellular System

摘要

In Orthogonal frequency division multiple access (OFDMA) cellular system, the user at the different location of the cell requires different number of subcarriers to satisfy the user's data rate requirement. In this paper, based on the Interference to Signal Ratio (ISR), we analyze the average number of downlink subcarriers required at inner and outer region for the two-hop OFDMA cellular system. Firstly we propose a two-hop OFDMA cellular system model. Then based on this model, we calculate the Cumulative Distribution Function of ISR at inner and outer region respectively, and obtain the theoretical analysis results for the average number of subcarriers required at two regions of the reference cell. Finally, with the help of the numerical calculation and Monte-Carlo simulations, we analyze the impact of the various parameters on the average number of subcarriers required of the two-hop cellular system. And the results are compared with the average number of subcarriers required of the one-hop cellular system.