基于OFDM的广播单播混合系统容量分析  

Capacity Analysis of OFDM Based Broadcast and Unicast Hybrid System

作　　者：贠超[1] 刘广宇[1] 杨曾[1] 卜智勇[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《天津大学学报》2010年第3期199-202,共4页Journal of Tianjin University(Science and Technology)

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA01Z280)

摘　　要：从信息论的角度分析了基于正交频分复用(OFDM)的广播单播混合系统容量.在广播单播混合系统中,广播与单播业务之间的资源分配方式可以分为两类:正交分配和非正交分配.文中分别推导了广播与单播业务采用正交分配(时分复用、OFDM)和非正交分配(重叠OFDM)时的混合系统容量的闭式解,并通过数值分析比较了这两类分配方式的容量.分析结果表明,与正交分配方式相比,非正交的重叠OFDM分配方式能够使混合系统获得更大的容量.The capacity of orthogonal frequency division multiplexing （OFDM） based broadcast and unicast hybrid system is analyzed from an information theoretical perspective. Resource allocation strategies between broadcast and unicast services in broadcast and unicast hybrid systems can be classified into two categories： orthogonal allocation and non-orthogonal allocation. In this paper, closed-form expressions for the capacity of hybrid systems with both ortbogonal allocation （i.e., time-division multiplexing and OFDM） and non-orthogonal allocation （i.e., superposed 0FDM） are derived. Furthermore, numerical analysis is provided to compare capacity of these two resource allocation strategies. Numerical results indicate that non-orthogonal superposed OFDM allocation outperforms orthogonal alloca- tion in terms of capacity.

关 键 词：正交频分复用 广播单播混合系统 容量分析 

分 类 号：TN911.2[电子电信—通信与信息系统]