Voice over IP: improving the quality over wireless LAN by adopting a booster mechanism: an experimental approach

Christian Hoene; Iacopo Carreras; Adam Wolisz

doi:10.1117/12.434296

25 July 2001 Voice over IP: improving the quality over wireless LAN by adopting a booster mechanism: an experimental approach

Christian Hoene, Iacopo Carreras, Adam Wolisz

Author Affiliations +

Proceedings Volume 4522, Voice Over IP (VoIP) Technology; (2001) https://doi.org/10.1117/12.434296
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

Abstract

The performance of unreliable voice transmission (Voice over IP) over wireless links is measured not by the throughput but by the perceptual speech quality. The speech quality is impaired by packet losses, which are common on wireless links, and by high transmission delays. In this paper, we describe the design and implementation of a novel Speech Property Based Booster that improves the quality of voice over wireless LANs. This booster is in compliance with existing standards and is transparent to other protocols. It uses characteristics of human speech production and features of modern audio codecs to distinguish packets regarding their importance for perceptual quality. Important packets are protected at the link layer by three mechanisms: selective packet loss recovery, redundant transmission and a hybrid solution. These mechanisms have been evaluated using an experimental set-up with commercial wireless LAN equipment. We made measurements of the objective audio quality and analyzed the effects of packet losses, both due to real wireless channels and late packet arrivals. Our experiments show that the booster increases the quality of voice best with the hybrid solution and that the performance of Voice over IP can be improved further.

Citation Download Citation

Christian Hoene, Iacopo Carreras, and Adam Wolisz "Voice over IP: improving the quality over wireless LAN by adopting a booster mechanism: an experimental approach", Proc. SPIE 4522, Voice Over IP (VoIP) Technology, (25 July 2001); https://doi.org/10.1117/12.434296

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