Subjective audio quality over a secure IEEE 802.11n network

This paper presents an empirical evaluation of audio quality generated by a G.711 codec and transmitted over IEEE 802.11n, IEEE 802.11b, and IEEE 802.11g Wireless Local Area Networks (WLANs). Audio quality decline due to additional calls or by securing the WLAN with Internet Protocol Security (IPsec) is quantified. Results suggest that audio quality over an IEEE 802.11n WLAN is not higher than over an IEEE 802.11b WLAN for up to 10 simultaneous calls. The data strongly suggest that toll quality audio (MOS ≥ 4.0) is not currently practical over IEEE 802.11 WLANs secured with WPA2, even using the G.711 codec.

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