Enhanced Timing Recovery Using Active Jitter Estimation for Voice-Over IP Networks

• Hyoung-Gook Kim,

Vol. 6, No. 4, April 24, 2012
10.3837/tiis.2012.04.003, Download Paper (Free):

• VoIP
• timing recovery
• active network jitter estimation
• buffering delay and packet loss

Abstract

Improving the quality of service in IP networks is a major challenge for real-time voice communications. In particular, packet arrival-delay variation, so-called “jitter,” is one of the main factors that degrade the quality of voice in mobile devices with the voice-over Internet protocol (VoIP). To resolve this issue, a receiver-based enhanced timing recovery algorithm combined with active jitter estimation is proposed. The proposed algorithm copes with the effect of transmission jitter by expanding or compressing each packet according to the predicted network delay and variations. Additionally, the active network jitter estimation incorporates rapid detection of delay spikes and reacts to changes in network conditions. Extensive simulations have shown that the proposed algorithm delivers high voice quality by pursuing an optimal trade-off between average buffering delay and packet loss rate.

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