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Hierarchical modulation is used in conjunction with error correction coding in many multimedia communication systems to provide unequal protection. We show that hard decision upper bounds given for binary symmetric channels can be used to find upper bounds for the bit error rate of different bit classes of a coded M-ary hierarchical modulation.
A robust coded scheme for progressive multimedia transmission is proposed for additive white Gaussian noise, flat Rayleigh fading channels, and frequency-selective channels using different unequal error protection methods in combination. Hierarchical modulation is coupled with a packetization/combining strategy and an efficient channel encoder consisting of a cyclic redundancy check outer coder concatenated...
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