A Simple Differential Modulation Diversity in the Presence of Unknown Multipath
无需信道估计的一种简单的差分分集OFDM传输方式

Recent years, space-time coding technique is gotten more attention. However, the space-time coding application is often under non-frequency-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.