无需信道估计的一种简单的差分分集OFDM传输方式

吕浚哲; 张海林; 刘增基

无需信道估计的一种简单的差分分集OFDM传输方式

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出版历程
- 收稿日期: 2002-10-22
- 修回日期: 2003-04-30
- 刊出日期: 2004-04-19

A Simple Differential Modulation Diversity in the Presence of Unknown Multipath

摘要

摘要: 空时码在近几年得到了普遍关注,但空时码的应用通常都假定信道具有非频率选择性衰落特性,同时还假定信道状态也是已知的,这些都极大地限制了空时码的应用。该文给出了一种未知频率选择性衰落信道下的差分分集调制方法。应用正交频分复用技术的基本原理,把一个频率选择性衰落信道转换成了多个并行平坦衰落信道。在此基础上,给出了一种无需信道估计的简单的时空频分集结构.仿真结果表明,这种结构在频率选择性衰落信道中无需信道估计就能得到很好的结果.
- 正交频分复用; 差分; 分集; 时空编码
Abstract: Recent years, space-time coding technique is gotten more attention. However, the space-time coding application is often under non-frequeucy-selective channel while the channel knowledge is known. All of these constrains the application of space-time coding. This paper presents a differential modulation diversity used in the presence of unknown multi-path. The proposed technique utilizes orthogonal frequency division multiplexing (OFDM) transforming a frequency selective fading channel into multiple flat fading sub-channels. Based on this, a space-time-frequency configuration applied in unknown frequency selective fading channel is given. And this method is verified by the simulation results.

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