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The availability of inexpensive CMOS cameras and microphones that can ubiquitously capture multimedia content from the environment is fostering the development of Wireless Multimedia Sensor Networks (WMSNs), i.e., distributed systems of wirelessly networked devices that can retrieve video and audio streams, still images, and scalar sensor data. WMSNs require the sensor network paradigm to be re-thought...
Scalable video coding technique has been desired for many years to realize a reliable transmission of video over heterogeneous networks. In this paper, we present a new system of scalable video broadcasting over wireless networks. For each group of pictures, a number of quality layers are produced using scalable video coding. We design the channel protection schemes using the forward error correction...
A novel adaptive intra refresh method for the wireless video communication is proposed, which considers the characteristic of the human visual system and the state information of the time-varying wireless channel jointly. An attention model is used to compute the perceptual weight map of the video content. The dynamic feedback channel state information (CSI) of the wireless channel, such as bit error...
This paper deals with the problem of finding an optimal subcarrier allocation strategy for uplink and downlink communications in an OFDMA metropolitan wireless system. In particular a two steps approach is considered; at the first step the scheduler establishes the amount of resources to assign to users on the basis of their quality of service (QoS) constraints, while, at the second step, channel...
Audio streaming over LR-WPAN is different from data communication because such wireless channels are limited in bandwidth and prone to errors. Nevertheless there are several scenarios such as distributed surveillance and emergency response, where lightweight multimedia applications are compelling solutions for pervasive and ubiquitous computing. This paper investigates the feasibility of transmitting...
Some communication applications, like multimedia, deliver data of different importance classes allowing unequal error protection (UEP) levels. In this paper, a multiple-input multiple-output (MIMO) system using orthogonal frequency division multiplexing (OFDM) is considered with a new UEP bit-loading algorithm based on the non-UEP algorithm by Chow, Cioffi, and Bingham. In the proposed bit-loading...
Before wireless multimedia applications can be truly successful, a number of technologically demanding problems must still be resolved. For example, future services will need to be delivered at a range of bit rates, dependent on network and channel characteristics, platform type, application and material content. End to end provision of multimedia information across network components of varying capability...
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