On the distortion SNR exponent of hybrid digital-analog space-time coding Academic Article uri icon


  • We consider the transmission of a real independent and identically distributed (i.i.d.) "analog" source over a quasi-static M-input N-output multiple-input multiple-output (MIMO) block-fading channel. The relevant performance criterion is end-to-end average quadratic distortion D versus channel signal-to-noise ratio (SNR), for given spectral efficiency , defined as the ratio of the source bandwidth over the channel bandwidth. In the limit of high SNR, we define the distortion SNR exponent a*() as the largest a such that D = snr-a, over all possible source-channel coding schemes of spectral efficiency . We find a simple upper bound on a *(), an achievable lower bound asep() achievable by separated (tandem) source-channel coding, and a tighter lower bound ahybrid () achievable by new hybrid digital analog space-time coding schemes. As a corollary, we have that a*() is completely determined for the scalar case M = N = 1 and for the "bandwidth compression" case 2 min{M,N}. Explicit and simple construction of hybrid space-time codes achieving ahybrid() are also given. 2007 IEEE.

published proceedings


author list (cited authors)

  • Caire, G., & Narayanan, K.

citation count

  • 74

complete list of authors

  • Caire, Giuseppe||Narayanan, Krishna

publication date

  • August 2007