A mixed satellite TV channel transmission scheme to enhance frequency bandwidth utilization

A mixed satellite TV channel transmission scheme to enhance frequency bandwidth utilization
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提高频率带宽利用率的混合卫星电视频道传输方案

DOI:
10.1002/dac.3266
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发表时间:
2017-08
影响因子:
2.1
通讯作者:
张亚生
张亚生
中科院分区:
计算机科学4区
文献类型:
--
作者:
赖俊宇;赵杰;张伟;何辞;张亚生

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近年来,电视行业开始向用户提供超高清和/或三维(3D)电视节目,这一方面可以给用户带来极大的观看体验,另一方面也大大增加了对传输带宽的要求,可能导致许多不同类型的电视系统出现带宽不足的情况。特别是,由于C和Ku频段可用的带宽严格有限,这种带宽短缺在当前的卫星电视广播系统中构成了严重的挑战。针对下一代卫星电视系统带宽不足的问题,提出了一种创新的混合信道传输方案。该方案综合了广播和组播方法、Ku和Ka频段以及宽形和斑点天线波束类型的优点。综合仿真实验表明,该混合方案能够在有效提高频带利用率的同时,为用户提供可负担的体验质量(QOE)。此外,为了应对不断增加的电视频道数量带来的影响,本文通过使用组播方法传输那些最不受欢迎的全球频道来改进所提出的方案,在Ku和Ka频段频率资源受限的情况下,该方案可以有效地降低高达90%的QOE劣化。
In the recent past, television (TV) industry has started to provide users with ultra high definition (ultra- HD) and / or three-dimensional (3D) TV programs, which on the one hand, can bring users greatly enhanced viewing experience, while on the other hand, considerably increases the transmission bandwidth requirements and may lead to bandwidth shortage situations in many different types of TV systems. In particular, this bandwidth shortage poses a serious challenge in the current satellite TV broadcasting systems due to the strictly limited bandwidth available in C and Ku frequency bands. Aiming at mitigating the bandwidth shortage problem, this paper proposes an innovative mixed channel transmission scheme for the next generation satellite TV systems. The proposed scheme integrates the merits of using both broadcast & multicast methods, both Ku & Ka frequency bands, as well as both wide-shaped & spot antenna beam types. According to the conducted comprehensive simulation experiments, this mixed scheme is able to effectively enhance the frequency bandwidth utilization with still providing users affordable quality of experience (QoE). Moreover, to cope with the impact brought by ever increasing number of provided TV channels, this paper enhances the proposed scheme by using multicast method to transmit those least popular global channels, which can efficiently reduce the QoE degradation up to 90% in Ku- and Ka-band frequency resource restricted scenarios.
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