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Performance of voice over IP (VoIP) over a wireless LAN (WLAN) for different audio/voice codecs

Mohd., Alias and Ong, Lee Loon (2007) Performance of voice over IP (VoIP) over a wireless LAN (WLAN) for different audio/voice codecs. Jurnal Teknologi, 47 (D). pp. 39-60. ISSN 0127-9696

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Abstract

Capacity and Quality of Service (QoS) are two of the most important issues that need to be resolved before the commercial deployment of VoIP over wireless LAN (WLAN). The capacity is highly dependent on the chosen speech codec. Thus, several codecs are studied (namely, G.711 and G.723.1 and G.729) to determine their effects on the available capacity supported. On top of that, factors affecting QoS such as packet loss, jitter, throughput, and delay for various capacity networks are studied in this paper. This was done by simulating VoIP traffics over the WLAN using Network Simulator 2 (ns2) and predicting voice quality based on E-model. The simulation measurements were verified by the theoretical analysis. In conclusion, G.711 codec allows up to 5 simultaneous VoIP nodes, G.723.1 codec allows up to 15 nodes and G.729 codec allows up to 5 nodes for a voice quality greater than R=70 and distance 10 meter from VoIP nodes to access point (AP)

Item Type:Article
Additional Information:D (Elektronik, Kawalan, Telekomunikasi & Teknologi Maklumat)
Uncontrolled Keywords:Quality of service (QoS), wireless LAN (WLAN), voice over IP (VoIP), voice codec
Subjects:Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions:Electrical Engineering
ID Code:5721
Deposited By: Pn Norhayati Abu Ruddin
Deposited On:23 Jun 2008 00:56
Last Modified:29 Nov 2013 03:49

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