基于OFDM的移动蜂窝系统中分布式带宽借复用机制

为了提高未来基于OFDM的移动蜂窝系统的频谱效率,尤其在小区/扇区间流量不均匀的情况下,本文基于两种传统的扇区结构(菱形扇区和五边形扇区)提出一种分布式带宽借复用DBBR(Distributed Bandwidth Borrowing and Reusing)算法。算法利用离基站较近的用户有着较好信道条件的特点,那些带宽不够的扇区以无功率控制的方式借复用相邻扇区中空闲的带宽和离基站较近的用户所使用的带宽,以此提高扇区的吞吐量。理论分析和仿真结果表明相对于传统的三扇区结构,该算法使扇区的平均吞吐量有20%左右的提升,同时说明加入功率控制也不会带来系统吞吐量更多的改善。

Distributed Bandwidth Borrowing and Reusing Scheme in OFDM-based Mobile Cellular System

A distributed bandwidth borrowing and reusing algorithm was proposed for two traditional sector structures(i.e.,diamond sector and pentagonal sector) to improve the spectrum efficiency in the future OFDM-based mobile cellular system,particularly in the case of the uneven distribution of the traffic among cells/sectors.In this algorithm,the users near the base station have better channel conditions,the sectors without enough bandwidth could in a manner without power control,borrow and reuse the idle bandwidth in the neighbor sectors and bandwidth used by the users near the base station so as to improve their throughput.The results of analysis and the simulation show that,compared with the traditional sector structure,the average sector throughput of this method can improved by about twenty percent,but no more improvements can be obtained by adding power control.