On space-frequency correlation of UWB MIMO channels

Xuemin Hong, Cheng Xiang Wang, John Thompson, Ben Allen, Wasim Q. Malik, Xiaohu Ge

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Conventional multiple-inputmultiple-output (MIMO) channel correlation models focus on describing the complex amplitude correlation of resolvable multipath components (MPCs). It has recently been shown that the time-of-arrival (ToA) correlation of resolvable MPCs, which has largely been ignored in the literature so far, is important for characterizing the spacefrequency (SF) correlation of MIMO channels in the ultrawideband (UWB) regime. The proposal of ToA correlation brings forth the following open questions: What is the fundamental difference between amplitude and ToA correlations? Are they mutually replaceable? What impact do they have on system performance? Is this impact related to channel bandwidth? This paper systematically answers the above questions. We demonstrate that, compared with a conventional model that only considers amplitude correlation, a UWB MIMO channel model taking into account both amplitude and ToA correlations leads to different theoretical maximum diversity order, numerical structure of the SF channel covariance matrix, spatial correlation function, and diversity performance. We conclude that ToA correlation is a necessary complement to amplitude correlation when the channel bandwidth exceeds 500 MHz, i.e., UWB channels. This new insight serves as the motivation for more realistic modeling of UWB MIMO channels and the inspiration for designing advanced UWB MIMO systems to fully exploit the SF channel correlation properties. © 2006 IEEE.

Original languageEnglish
Article number5575454
Pages (from-to)4201-4213
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number9
Publication statusPublished - Nov 2010


  • Channel modeling
  • diversity order
  • multiple inputmultiple output (MIMO)
  • spacefrequency (SF) correlation
  • ultrawideband (UWB)


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