Optimal Rate Adaptation for VoIP Over Wireless Tandem Links

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The authors present an optimization framework for transmitting VoIP packets generated by a multi-rate voice encoder over error-prone wireless links. Their proposed framework aims at identifying the optimal joint source channel coding rates of each voice frame based on the frame perceptual importance such that the quality of the received speech signal is maximized. Simulation results show that their proposed framework outperforms its literature counterparts and has a low computational complexity. Protecting voice against bit errors introduced by fading links and packet erasures caused by network buffering is essential for delivering reliable and high quality voice over wireless links.