Design of Wireless Video Communication System Used to Monitor and Control Plant Disease

Author(s):  
Xiuqing Wang ◽  
Chunxia Zhang ◽  
Shifeng Yang
Author(s):  
Athar Ali Moinuddin ◽  
Mohd Ayyub Khan ◽  
Ekram Khan ◽  
Mohammed Ghanbari

Designing wireless video communication system is a challenging task due to high error rates of wireless channels, limited and dynamically varying bandwidth availability, and low energy and complexity requirements of portable multimedia devices. Scalable video coders having excellent rate-distortion performance are most suited to cope with time varying bandwidth of wireless networks, but encoded bits are extremely sensitive to channel errors. This chapter presents a reliable video communication system exploring opportunities offered by various network layers for improved overall performance, while optimizing the resources. More specifically, cross-layer approach for Unequal Error Protection (UEP) of scalable video bitstream is the main theme of this chapter. In UEP, the important bits are given a higher protection compared to the other bits. Conventionally, UEP is achieved by using Forward Error Correction (FEC) at the application layer. However, UEP can also be provided at the physical layer using hierarchical modulation scheme. In this chapter, the authors discuss cross-layer design methodology for UEP that rely on interaction between the application layer and the physical layer to achieve reliable and high quality end-to-end performance in wireless environments. The discussion is mainly focused for wavelet coded video, but it is applicable to other embedded bitstreams as well.


1997 ◽  
Author(s):  
Tomoki Sakamaki ◽  
Hisashi Ibaraki ◽  
Tadashi Ichikawa ◽  
Ryota Suzuki

2009 ◽  
Vol E92-C (11) ◽  
pp. 1387-1395 ◽  
Author(s):  
Keiji HIRATA ◽  
Yasunori HARADA ◽  
Toshihiro TAKADA ◽  
Naomi YAMASHITA ◽  
Shigemi AOYAGI ◽  
...  

2021 ◽  
pp. 1-16
Author(s):  
Heba Mahmoud Mohammad Abdel‐Aziz ◽  
Mohammed Nagib Abdel‐ghany Hasaneen

2021 ◽  
Vol 59 (1) ◽  
pp. 1-20
Author(s):  
Cédric Jourde ◽  
Marie Brossier ◽  
Muriel Gomez-Perez

ABSTRACTThis article analyses how the state in Senegal has managed the hajj since the liberalisation era in the early 2000s. Although the essence of the hajj is religious, it is also deeply political and requires that the state manages complex relations with pilgrims, religious leaders, private travel agencies, politicians and Saudi authorities. This article argues that three inter-related imperatives structure the conduct of the Senegalese state: a security imperative, a legitimation imperative, and a clientelistic imperative. Security concerns lead the state to monitor and control pilgrims travelling to Mecca. Legitimation is seen in the collaborative relations with Sûfi orders and in the framing of the hajj organisation as a ‘public service’. Finally, given the magnitude of financial and symbolic resources attached to the hajj, clientelistic relations are constitutive of state officials’ actions. Overall, despite the post-2000 liberalisation of the hajj, the state has maintained its role as a gatekeeper, regulator and supervisor.


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