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| A Simple Differential Modulation Diversity in the Presence of Unknown Multipath |
| Lu Jun-zhe; Zhang Hai-lin; Liu Zeng-ji |
| National Key Lab of ISN Xidian University Xi’an 710071 China |
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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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Received: 22 October 2002
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2004, Vol. 26 
