【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。更多还原

【Abstract】 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.更多还原