OFDM-MIMO communication systems in a Rayleigh faded environment with imperfect channel estimates

  • Authors:

  • Steve Gifford;John E. Kleider;Scott Chuprun

  • Affiliations:

  • General Dynamics Decision Systems, Scottsdale, AZ;General Dynamics Decision Systems, Scottsdale, AZ;General Dynamics Decision Systems, Scottsdale, AZ

  • Venue:
  • MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I
  • Year:
  • 2003

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Abstract

This paper presents the perfonnance of mobile orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) communication systems with imperfect knowledge of the channel matrix. MIMO systems typically require a channel matrix, which can be determined initially from a training sequence. However, mobile communication systems exhibit a time-varying channel matrix and have time and frequency selective fades which result in perfonnance degradation of the MIMO system. Channel tracking methods can be used to estimate the time-varying channel matrix but cannot in practice be error free. This paper presents results of V-BLAST (Vertical Bell Laboratories Layered Space-Time) MIMO simulations using the Geometric Wide-band Time-varying Channel Model (GWTCM) with Rayleigh faded environments and imperfect channel matrix knowledge. Flat fading is assumedfor each OFDM subcarrier. OFDM-MIMO architectures such as OFDM coupled with V-BLAST can be easily implemented by exploiting the built-in and flexible multi-channel architectures of advanced Software Defined Radios (SDR).