摘要
随着无线技术的发展,对正交频分复用系统的频谱效率要求越来越高,子载波间隔是影响系统频谱效率的主要因素。本文推导出了时变频率选择性信道下OFDM系统容量表达式,然后分析了子载波间隔对OFDM系统频谱效率的影响,提出了子载波间隔自适应以最大化频谱效率的方法,仿真结果证明此类自适应技术能大幅提高OFDM系统的频谱效率。
The development of wireless communications technology OFDM demands higher and higher spectrum efficiency. The spacing of sub-carrier bandwidth is key factors that infect the spectrum efficiency. This paper deducted the OFDM capacity in the time-varying spectrum selective channel, analyzed the influence of sub-carrier spacing to spectrum efficiency, and proposed the method of adaptive sub-carrier spacing to maximum spectrum efficiency. Simulation proved that adaptive technology can prompt spectrum efficiency greatly.
出处
《电信科学》
北大核心
2009年第8期46-50,共5页
Telecommunications Science
基金
国际科技合作基金资助项目(No.2008DFA11700)
中国科学院上海微系统与信息技术研究所青年创新基金资助项目
关键词
OFDM
频谱效率
子载波间隔
自适应
OFDM, spectrum efficiency, sub-carrier spacing, adaptive
