Digital Signal Processing Reference
In-Depth Information
Chapter 13
REAL-TIME TRANSMISSION OF H.264 VIDEO
OVER 802.11B-BASED WIRELESS AD HOC
NETWORKS
*
E. Masala,
1
C. F. Chiasserini,
2
M. Meo,
2
J. C. De Martin
3
1
Dipartimento di Automatica e Informatica;
2
Dipartimento di Elettronica;
3
IEIIT-CNR Politec-
nico di Torino, Italy Email: demartin@polito.it
Abstract
This chapter aims at evaluating a number of Quality of Service (QoS) indices of
a real-time video transmission over an 802.11b ad hoc wireless network. Video is
coded according to the state-of-the-art ITU-T H.264 encoder and its transmission
is simulated by means of the
ns-2
network simulator. Objective quality measure-
ments are presented. Moreover, the impact of different parameters — both at the
encoder and at the MAC level —, of background interfering traffic and of the
number of relay nodes, is studied, showing the various trade-offs involved.
Keywords:
Real-time video, IEEE 802.11 wireless local area networks, ad hoc wireless net-
works.
1. INTRODUCTION
The great success of the IEEE 802.11b technology for wireless local area
networks (WLANs) [1] is creating new opportunities for the deployment of ad-
vanced multimedia services. Important applications such as telephony, video-
conferencing and audiovisual streaming are on path to move to Wireless Local
Area Networks (WLANs), creating a complex, yet highly attractive scenario,
where users will be able, at least in principle, to seamlessly switch from typ-
*This work was supported in part by CERCOM, the Center for Multimedia Radio Communications, Torino,
Italy, http://www.cercom.polito.it.
