Abstract

We consider the problem of embedded image transmission with feedback of channel state information (CSI) and retransmission request. Adaptive modulation is employed to improve the spectral efficiency. Constrained retransmission is employed to provide reliable packet transmission with limited delay. Performance analysis and numerical results over Nakagami block fading channels are provided for the transmission system with statistical or instantaneous CSI at the transmitter. The results show that CSI at the transmitter is very important for adaptive modulation/coding over fading channels.

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