Wireless video communication on embedded system

IEEE Transactions on Consumer Electronics, 2003

In this paper, we present B survey on the techniques for the transport of MPEC-4 video over wireless networks. As a new object-based video compression standard, MPEG-4 has been proved to be suitable for wireless applications. However, because of the characteristics of wireless channels, such as varying channel capacity and burst bits errors, some new techniques such as scalable and error-resilient video coding techniques are required to be incorporated into IMPEG-4 to improve the coding efficiency. These techniques are discussed in this paper. The experimental results show that although these new techniques have improved the performance greatly, there is still a lot of research work to be pursued.

Recently the development of Distributed Video Coding (DVC) has provided the promising theory support to realize the infrastructure of Wireless Multimedia Sensor Network (WMSN), which composed of autonomous hardware for capturing and transmission of quality audio-visual content. The implementation of DVC in WMSN can better solve the problem of energy constraint of the sensor nodes due to the benefit of lower computational encoder in DVC. In this paper, a practical DVC scheme, pixel-domain Wyner-Ziv(PDWZ) video coding, with slice structure and adaptive rate selection(ARS) is proposed to solve the certain problems when applying DVC into WMSN. Firstly, the proposed slice structure in PDWZ has extended the feasibility of PDWZ to work with any interleaver size used in Slepian-wolf turbo codec for heterogeneous applications. Meanwhile, based on the slice structure, an adaptive code rate selection has been proposed aiming at reduce the system delay occurred in feedback request. The simulati...

TELKOMNIKA, 2011

Video streaming bergerak adalah salah satu layanan multimedia yang mengalami perkembangan sangat pesat. Penggunaan bandwitdh yang berfluktuatif pada jaringan kanal nirkawat merupakan kendala utama dalam komunikasi multimedia dewasa ini. Penelitian ini menawarkan kombinasi metode yang dapat diskala sebagai pemecahan yang paling attraktif untuk masalah tersebut. Metode yang dapat diskala untuk komunikasi nirkawat seharusnya disesuaikan dengan runtun video input yang akan diproses.

Multimedia Tools and Applications, 2019

Today's 4G and 4.5G network is not capable of meeting the needs of a broadband network, 5G is designed to meet the needs. The key features of 5G include high throughput, improved spectrum efficiency, and reduced latency. Higher frequencies may be used by 5G, but the result is high cost. Furthermore, the volumes of video traffic in wireless system networks, there is an urgent need for improving the quality of video delivery. For this reason, this paper is devoted to proposing a wireless mobile system based on the updated LTE-ADV Pro (4.5G-4.9G) technology to arrive 5G capability with low cost. The proposed system uses advanced adaptive modulation and coding and advanced waveform to provide higher spectral efficiency. It also incorporates the proposed method of the adaptive video streaming of multiple video data rates. The results presented that the proposed wireless technique is better than LTE-ADV regarding data transmitted, while the proposed video coding method is better than H.265. The overall result in the proposed system is supported users about is 24% as compared to LTE-ADV with H.265 and about is 100% as compared to LTE with H.265.

EURASIP Journal on Advances in Signal Processing, 2013

This paper sums up relevant topics covered by the special issue titled 'Real-Time Multimedia Coding and Transmission', including efficient content representation, multimedia transmission, hardware and software acceleration, and transcoding techniques.

Wireless Ad Hoc Networks are characterized by their ability to communicate amongst one another independently of any existent infrastructure. Such networks could be vital for multiple applications like medical applications, for emergency applications, rescue operations to name a few. Support for multimedia applications over wireless ad hoc networks has gained tremendous momentum in the past decade. The survey presented here is primarily targeted towards realization of real time video communication in wireless ad hoc networks. When any video is transmitted from a transmitter to a receiver in any wireless network, various video packets may be lost due to channel errors, transmission errors or low bandwidth. Active video communications are time critical and to attain the required Quality of Service it is essential to minimize the packet loss. In such a scenario, a client joining the broadcast service only requests the scalable layers, which provide either a signal that the device is capable or chooses to process. From the past industrial result it is seen that the transmission of multiple video signals using SVC is much more efficient in terms of bit-rate compared to simulcast transmission.As the video stream is passed from one node to another, in order to reduce the packet losses in the transmission path, several frames are introduced through which transmissions are to take place. The video streams are made to pass through this frames

2004 IEEE International Conference on Multimedia and Expo (ICME) (IEEE Cat. No.04TH8763)

We present an efficient MPEG-4-based interactive player for PDA-like embedded devices in this paper. Our system can receive media from various sources, then decompress and compose them in an object-oriented manner. Embedded devices such as PDA usually have limited computational resources, memory size. power budgets. and multimedia capabilities. To overcome these constraints, two novel mechanisms were introduced, namely adaptive frame rule (AFR) and scene cache graph management (SCCMJ. Furthermore, a media decoding framework was proposed such that multimedia objects of different formats can be retrieved from different sources and then be decoded. This framework can be extended by add-on components. A semi-pull model was also designed for the synchronization of heterogeneous media objects. Finally, all the key modules were efficiently implemented and optimized. These modules include MPEG-4 video decoder, 2D/3D graphic engine. buffer management, script engine, and streaming service.

IEEE Transactions on Vehicular Technology, 2005

In this paper, a new medium access control protocol for wireless communications, named Multimedia Integration Multiple Access Control (MI-MAC), is presented and investigated. We explore, via an extensive simulation study, the performance of MI-MAC when integrating voice, e-mail data, and web packet traffic with either MPEG-4 or H.263 videoconference streams over a noisy wireless channel of high capacity. Our scheme, one of the first in the literature that considers the integration of MPEG-4 or H.263 streams with other types of packet traffic over wireless networks, achieves high aggregate channel throughput in all cases of traffic load, while preserving the quality of service (QoS) requirements of each traffic type. Index Terms-MAC protocol, MPEG-4 and H.263 video, voicevideo-data integrated access, wireless cellular communications, wireless channel errors.

CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006., 2006

3GPP has specified Multimedia Broadcast/Multicast Services (MBMS) addressing the increasing demands of multimedia download and streaming applications in mobile scenarios. Thereby, video coding is an essential component and H.264 is the only recommended video codec in MBMS mainly due to its high compression efficiency and easy network integration. In this paper we introduce the main system design parameters that influence the performance of MBMS video streaming over EG-PRS and UMTS using H.264 encoded streaming. Effective design methodology that includes robustness against packet losses and efficient use of the scarce radio resources is presented. Thereby, care is taken also about the limited processing power of mobile terminals, service delay constraints, and heterogeneous receiving conditions. We also investigate an advanced receiver concept, the so called permeable-layer receiver. Selected simulation results show the suitability of certain parameter settings as well as the benefits provided by the advanced receiver concept.

Wireless Networks, 1996

In this paper, the effects of digital transmission errors on H.263 codecs are analyzed and the transmission of H.263 coded video over a TDMA radio link is investigated. The impact of channel coding and interleaving on video transmission quality is simulated for different channel conditions. Fading on radio channels causes significant transmission errors and H.263 coded bit streams are very vulnerable to errors. Powerful Forward Error Correction (FEC) codes are therefore necessary to protect the data so that it can be successfully transmitted at acceptable signal power levels. FEC, however, imposes a high bandwidth overhead. In order to make best use of the available channel bandwidth and to alleviate the overall impact of errors on the video sequence, a twolayer data partitioning and unequal error protection scheme based on H.263 is also studied. The scheme can tolerate more transmission errors and leads to more graceful degradation in quality when the channel SNR decreases. In lossy environments, it can improve the video transmission quality at no extra bandwidth cost.