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Rate and Power Allocation for Layered Transmission With Superposition Coding

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2 Author(s)
Farzad Etemadi ; California Univ., Irvine ; Hamid Jafarkhani

We consider layered transmission of a Gaussian source over a quasi-static fading channel. A broadcast strategy is used in which multiple layers of source data are superimposed, and each layer is allocated a different power and transmission rate. For a multiple-antenna system where either the transmitter or the receiver has a single antenna, we propose a low-complexity algorithm for minimizing the expected end-to-end distortion of the received signal. Numerical results for a Rayleigh fading channel are presented, and the performance gain over a time-sharing strategy is quantified. It is numerically shown that for a wide range of operating conditions, equal rate allocation is as good as unequal rate allocation.

Published in:

IEEE Signal Processing Letters  (Volume:14 ,  Issue: 11 )