报告题目: |
无线通信讲席教授组系列报告：Space-Time Coding for Cooperative Communications |
报告人: |
Xiang-Gen Xia |
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Charles Black Evans Professor Dept of Electrical and Computer
Engineering, University of Delaware, IEEE Fellow
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报告时间: |
2009-03-20 15:30 |
报告地点: |
FIT楼多功能厅 |
主办单位: |
电子工程系 |
简介: |
When wired modems had been well developed in the last century, wireless modems have more challenges, such as interference and fading. They are just in the beginning stage, such as IEEE 802.11 and 802.16. To overcome interference and fading, there are two current ways. One is to use multiple transmit/receive antennas (MIMO) and the other is to use cooperative communications. Space-time coding is used to achieve the spatial diversity for both techniques. One major difference, however, for these two techniques is the synchronization that may be a problem for cooperative communications but not for MIMO systems. While all space-time codes for MIMO systems can be directly applied to cooperative communications in the synchronization case, new space-time coding schemes are needed for asynchronous cooperative communication systems to achieve spatial diversity. In this talk, we first discuss some of this background. We then present a new family of space-time coding schemes that achieve full spatial diversity for asynchronous cooperative systems, which is obtained by constructing shift-full-rank matrices (SFR). We then present systematic constructions of SFR matrices. Finally we show that these codes have simplified decoding methods, MMSE-DFE, that still achieve full spatial diversity. |
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