Dynamic Fractional Frequency Reuse (DFFR) with AMC and Random Access in WiMAX System

作     者：Mohades, Zohreh Vakili, Vahid Tabataba Razavizadeh, S. Mohammad Abbasi-Moghadam, Dariush 

作者机构：IUST Sch Elect Engn Dept Telecommun Tehran Iran IUST Dept Elect Engn Tehran Iran Shahid Bahonar Univ Dept Elect Engn Kerman Iran 

出 版 物：《WIRELESS PERSONAL COMMUNICATIONS》 (无线个人通信)

年 卷 期：2013年第68卷第4期

页      面：1871-1881页

核心收录：

学科分类：0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

主　　题：Dynamic fractional frequency reuse WiMAX Inter cell interference Adaptive modulation and coding Random access 

摘      要：In this paper;dynamical resource allocation scheme is proposed to improve throughput and fairness in the modern broadband wireless systems such as IEEE 802.16 Worldwide Interoperability for Microwave Access. To assign the subcarriers to users, dynamic fractional frequency reuse is used. In dynamic fractional frequency reuse, each cell is partitioned into two regions, one called super region and another called regular region. Regular region is divided into 3 parts which correspond to the three sectors. In this method, a utility function is firstly used for the subcarrier allocation to the geographical regions and then opportunistic scheduling is applied for the assignment subcarriers to users in each cell. In order to increase the throughput of the system, adaptive modulation and coding techniques are used. Using dynamic fractional frequency reuse reduces fairness among users of a cell. Therefore a random access sub-band is applied to improve the fairness of the system.