Spatial correlation in ultrawideband channels

被引：33
作者：
Malik, Wasim Q. [1 ]
机构：
[1] MIT, Informat & Decis Syst Lab, Cambridge, MA 02139 USA
来源：
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2008年 / 7卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
antenna arrays; multiple-input multiple-output (MIMO); spatial correlation; ultrawideband (UWB);
D O I：
10.1109/TWC.2008.060547
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Correlated fading adversely affects the spatial multiplexing and diversity performance of multiple-antenna systems. This paper presents an empirical investigation of spatial correlation in ultrawideband (UWB) indoor channels in the FCC-allocated 3.1-10.6 GHz band. The impact of a number of system parameters on spatial correlation at the receiver is evaluated. It is found that the coherence distance falls with channel bandwidth in endfire arrays but not in broadside arrays. The complex correlation decays less rapidly with distance in broadside arrays than in endfire arrays, especially under line-of-sight, but the envelope correlation is circularly symmetric in space. Strong dependence of spatial correlation and coherence distance on the channel center frequency is observed. Furthermore, horizontally polarized links are found to exhibit less correlation than vertically polarized links. A discussion of the implications of these results for multiple-antenna UWB systems is provided.
引用
收藏
页码：604 / 610
页数：7
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