Large penalty of hybrid diversity with uncoded modulation in slow rayleigh fading

  • Authors:

  • S. Haghani;N. C. Beaulieu;M. Z. Win

  • Affiliations:

  • Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta.;-;-

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2006

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Abstract

In hybrid selection/maximal ratio combining (H-S/MRC) the receiver selects the L branches with the largest signal-to-noise ratios (SNRs) from N available diversity branches and performs maximal ratio combining (MRC). A penalty is incurred with respect to MRC which can be defined as the increase in SNR required for H-S/MRC to achieve the same symbol error probability as MRC. Recently, this penalty was investigated specifically for two-dimensional modulations. In this paper, we derive the asymptotic SNR penalties in slow Rayleigh fading for small and large values of SNR for general uncoded signaling constellations