【摘要】 OFDM(正交频分复用)是一种高效的多载波调制技术,可以用来对抗无线环境中的多径衰落,减少码间干扰。空时编码是一种发射分集技术。文中主要研究基于M IMO(多输入多输出)-OFDM的空时分组码和空频分组码的系统结构以及编译码方法。仿真结果表明,将空时编码技术与M IMO-OFDM技术相结合能有效地抵抗频率选择性随机衰落。更多还原

【Abstract】 Orthogonal frequency-division multiplexing(OFDM) is an efficient multi-carrier modulation technique to overcome the multi-path fading and reduce the ISI in wireless channels.The space-time block code(STBC) is a kind of transmission diversity technique.The constructions of OFDM in a Multiple-Input Multiple-Output(MIMO) system and the space-time block code as well as the space-frequency block code(SFBC) are described.The results of simulation show that space-time block code based on MIMO-OFDM is a highly effective technique against the frequency-selective random fading.更多还原