SCMA系统中基于能效的码本和功率分配机制

在倡导绿色通信的未来,如何提高能效、降低功耗将成为非常重要的问题.针对基于稀疏码多址接入技术的单小区多用户上行蜂窝移动通信系统,在保障用户服务质量(quality of service,QoS)需求的前提下,以最大化系统上行能效为目标,提出了一种资源分配机制,主要包括码本和功率的分配.为了降低基站的负荷,减小网络信令开...

Secrecy performance analysis of opportunistic relay selection for the wiretap two-way cooperative networks

Lung cancer is the malignant tumor with the highest death rate in China, which poses a danger to public life and health. Exploring how video websites present lung cancer can provide a reference and perspective for health communication in the mobile Internet era. 220 lung cancer videos spanning 10 years on Youku.com were analyzed by determining the inclusion criteria and content coding. Self-media and non-professional individuals were the main video publishers, and there were more unscientific contents in the published information. The videos simply and programmatically focused on presenting early symptoms of lung cancer, and scientific screening recommendations, social support, and actual survival status of patients rarely appeared. Analysis of the content using the health belief model revealed that action cues, perceived severity, and self-efficacy were the main content presented, and there were significant differences in the presentation of elements of the health belief model among different release sources. The videos generally have information that is not authoritative, scientific, and adequate, which also shows an awkward reality of health information dissemination in the UGC ecology.