Title :
Effect of fading on the Performance of VOIP in IEEE 802.11 a WLANs
Author :
Awoniyi, Olufunmilola ; Tobagi, Fouad A.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
Abstract :
We investigate the quality of voice communication over IEEE 802.11a WLANs taking realistic channel models into account. We show that the assessment of VoIP performance is overly optimistic if fading is ignored when compared with systems where fading is taken into account. Via simulation, we derive the distribution of VoIP performance (in terms of mean opinion score-MOS) for all the data rates specified in the IEEE 802.11a standard and a range of typical signal-to-noise ratio values. We use a measure for assessing VoIP performance that includes a target level of user-satisfaction and a bound on the probability of not achieving this target. The impact of retransmissions and channel estimation errors on VoIP performance is also discussed.
Keywords :
IEEE standards; Internet telephony; channel estimation; fading channels; voice communication; wireless LAN; IEEE 802.11a WLAN; IEEE 802.11a standard; VOIP performance; channel estimation error; data rate; fading effect; mean opinion score; quality of voice communication; signal-to-noise ratio; voice retransmission; Electronic mail; Fading; Internet telephony; Land mobile radio cellular systems; Performance loss; Physical layer; Shadow mapping; Signal to noise ratio; Telecommunication standards; Wireless LAN;
Conference_Titel :
Communications, 2004 IEEE International Conference on
Print_ISBN :
0-7803-8533-0
DOI :
10.1109/ICC.2004.1313235
