Lower bounds on the SER of LTE SFBC systems with imperfect CSI

  • Authors:

  • Michael Horvat;Zijian Bai;Peter Jung

  • Affiliations:

  • Intel Mobile Communications, Neubiberg, Germany;Lehrstuhl für KommunikationTechnik, Duisburg, Germany;Lehrstuhl für KommunikationTechnik, Duisburg, Germany

  • Venue:
  • Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
  • Year:
  • 2011

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Abstract

The work in this paper assumes a space-frequency block coding (SFBC) system is considered, which is compliant to the Long-Term-Evolution (LTE) specification. The SFBC symbols are modulated using arbitrary Quadrature-Amplitude-Modulation (QAM) and transmitted over a frequency-selective Rayleigh fading channel. The receiver applies channel estimation and linear zero-forcing (ZF) detection. The uncoded symbol error ratio (SER) of the linear ZF SFBC detector is studied in presence of channel estimation and interpolation errors. The presented work derives a closed-form expression for the probability density of the instantaneous SNR at the output of the ZF detector, which also accounts for the channel estimation and frequency correlation of the channel. Numerical integration of the elaborated probability density provides a lower bound on the SER for arbitrary QAM-modulation.