Physical limits to the capacity of wide-band Gaussian MIMO channels

  • Authors:
  • Anna Martini;Andrea Massa;Massimo Franceschetti

  • Affiliations:
  • Department of Information Eng. and Computer Science, Univ. of Trento, Trento, Italy;Department of Information Eng. and Computer Science, Univ. of Trento, Trento, Italy;Dept. of Inf. Eng. and Comp. Science, Univ. of Trento, Trento, Italy and California Inst. for Telecommunications and Inf. Technology, Dept. of Electrical and Computer Eng., Univ. of California at ...

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2009

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Abstract

In this letter a physical limit to the information capacity of a multiple-input multiple-output (MIMO) Gaussian channel is presented exploiting the theory of nonredundant sampling of scattered fields. For a MIMO narrow-band system of arbitrarily large spatial extension, the information capacity limit is the same as the one of a single-input single-output (SISO) ultra-wide band (UWB) system. For MIMO systems of finite size, transmitting over a range of frequencies, space and frequency diversities can be optimally combined by allocating the signal power uniformly across space, and increasing linearly across frequency.