摘要
LTE(Long Term Evolution)系统将OFDM(Orthogonal Frequency Division Multiplexing)技术作为其物理接口层的关键技术,并引入了物理资源块的概念,在此基础上将LTE系统的固定大小资源块分配方案改进为大小可变的动态资源块分配方案。即在室内场景下,可以将分配的资源块的大小扩展至标准资源块的两倍,这样可以在性能基本不下降的情况下降低分配算法的复杂度;而在室外车载场景,则将资源块减至原来的一半,性能有明显改善。仿真结果表明,该方案充分利用了无线信道的分集特性,性能优于LTE系统的固定方案。
The LTE system has chosen the OFDM as the key technique of the physical interface layer, and introduced the concept of resource block （RB） allocation. This paper presents a dynamic-sized resource block instead of the fixed one in the resource allocation scheme of the LTE system. The resource block is expanded to double-size as the standard resource block for indoor office environment to reduce the complexity and is cut down to half-size,i, e. 4 symbols and 6 subcarriers, on outdoor and vehicular occasions for better capacity. Simulation results show that the proposed dynamic RB scheme is better than the fixed one.
出处
《南京邮电大学学报（自然科学版）》
2011年第6期27-31,共5页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家重点基础研究发展计划(973计划)(2007CB310607)
国家高科技研究发展计划(863计划)(2009AA01Z241)
国家科技重大专项(2011ZX03001-006-02
2011ZX03005-004-03)资助项目
