Title :
Adaptive Rate Control for VoIP in Wireless Ad Hoc Networks
Author :
Zhang, Hongqi ; Zhao, Jiying ; Yang, Oliver
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ottawa, ON
Abstract :
The purpose of this paper is to study the performance of voice transportation in wireless ad hoc networks. First we analyze the characteristics of wireless channel and speech coding standard AMR-WB, and then we propose an adaptive source network rate control scheme to battle packet loss. The basic idea is to adapt the voice coding bit rate to the available network bandwidth in order to maximize the quality of voice. The PESQ MOS value is used as the evaluation criteria for the adaptive rate control scheme. Moreover, the discontinuous transmission operation and packet combination are utilized to improve the performance further. The experimental results show the effectiveness of this scheme.
Keywords :
Internet telephony; ad hoc networks; adaptive control; telecommunication congestion control; wireless channels; VoIP; adaptive source network rate control scheme; discontinuous transmission operation; packet combination; packet loss; speech coding standard; wireless ad hoc networks; wireless channel; Ad hoc networks; Adaptive control; Bandwidth; Bit rate; Degradation; Mobile ad hoc networks; Programmable control; Speech analysis; Speech coding; Wideband;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.596
