scholarly journals Channel-Allocation Plan for National and Local T-DAB Services in VHF Band III

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Sang-Lim Ju ◽  
Myung-Sun Baek ◽  
Kyung-Seok Kim
Keyword(s):  
Channel Allocation ◽  
Single Frequency ◽  
Large Area ◽  
Very High Frequency ◽  
Interference Analysis ◽  
Transmission Parameters ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Channel Interference ◽  
Allocation Planning

The digital audio broadcasting (DAB) system is mainly designed for large-area coverage and is suited for a single-frequency network (SFN) operating in Very High Frequency (VHF) Band III. To operate successfully, the SFN requires a different network-planning approach for multiple-frequency networks and should avoid self-interference. This paper focuses on nationwide SFN planning and DAB channel-allocation planning to replace all frequency-modulation (FM) services with terrestrial DAB services in VHF Band III. In South Korea, VHF Band III has been used for terrestrial digital multimedia broadcasting (T-DMB) services; thus, available frequencies should be investigated for T-DAB services and the nationwide SFN. An approach for broadcasting channel-interference analysis is proposed herein. For the interference analysis, the geographical features and the information for stations of legacy FM radio broadcasting and T-DMB, such as transmission parameters, are considered. The ratio of the interference area to the coverage is calculated via the channel-interference analysis. Areas affected by the self-interference in the nationwide SFN are investigated. The results of this paper provide insights regarding channel-allocation planning for T-DAB services and an approach for nationwide SFN planning.

scholarly journals Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

2014 ◽  
Vol 14 (8) ◽  
pp. 2119-2124 ◽  
Author(s):  
K. Motojima ◽  
N. Haga
Keyword(s):  
Line Of Sight ◽  
Very High Frequency ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Line Of Sight Propagation ◽  
Propagation Paths ◽  
Anomalous Propagation ◽  
Radio Band ◽  
Very High

Abstract. This paper was intended to find out any relation between anomalous line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long term. For that purpose, a multidirectional VHF band monitoring system was established and utilized. Anomalous line-of-sight propagation on the VHF band was distinguished from the monitored wave by using a statistical analysis. After the stochastic consideration, it was found out that earthquakes associated with anomalous propagation were characterized by magnitude of earthquakes M ≥ 4.5, and distances from epicenters L ≤ 75 km. The anomalous propagation was monitored on the VHF band a few days before the associated earthquakes occurred. Moreover, the anomaly appeared on multidirectional propagation paths simultaneously. The anomaly on the line-of-sight propagation indicates the possibility of narrowly focusing the area of the epicenter of earthquake.

Toward an Access Infrastructure for Mobile Cloud

2013 ◽  
Vol 5 (3) ◽  
pp. 6-19
Author(s):  
Yuan-Kao Dai ◽  
Li-Hsing Yen ◽  
Jia-Wei Su
Keyword(s):  
Simulated Annealing ◽  
Simulated Annealing Algorithm ◽  
Mesh Networks ◽  
Channel Allocation ◽  
Network Connectivity ◽  
Cloud Service ◽  
Network Capacity ◽  
Mobile Cloud ◽  
Channel Interference ◽  
Wireless Interfaces

The provision of mobile cloud service calls for a wireless access infrastructure that offers high bandwidth to mobile users. Among all enabling technologies, wireless mesh networks (WMNs) have the advantage of low deployment cost and widely available user equipments. To provide more bandwidth, access points in WMNs are commonly equipped with multiple wireless interfaces (radios) that can operate on multiple non-overlapping channels in parallel. The objective of channel assignments in a multi-channel, multi-radio MWN is to reduce co-channel interference experienced by links so as to increase network capacity while maintaining network connectivity. Prior studies addressing this issue majorly considered effects of co-channel interference at the link layer. In this study, the authors consider co-channel interference at the physical layer. Furthermore, most existing methods are based on heuristic or game theory. This study applies simulated annealing technique to the channel allocation problem. The objective function for this approach is defined as the total signal-to-interference radio (SIR) experienced by each link. To maintain network connectivity, the proposed approach limits the set of assigned channels for each radio. Experimental results show that, compared with traditional heuristic-based and game-theoretic approaches, the proposed simulated annealing algorithm results in more operative links.

A VHF interferometry system for detecting anomalous propagation of FM radio broadcasting waves related to earthquakes and some preliminary results

2013 ◽  
Vol 183 (1) ◽  
pp. 16-24
Author(s):  
Nozomi Ohno ◽  
Yuka Tone ◽  
Katsumi Hattori ◽  
Isao Yamamoto ◽  
Shin Shimakura ◽  
...  
Keyword(s):  
Preliminary Results ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Anomalous Propagation

High Efficiency Large Area a-Si:H and a-SiGe:H Multi-junction Solar Cells Using MVHF at High Deposition Rate

2009 ◽  
Vol 1153 ◽  
Author(s):  
Xixiang Xu ◽  
Dave Beglau ◽  
Scott Ehlert ◽  
Yang Li ◽  
Tining Su ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
High Deposition Rate ◽  
Discharge Process ◽  
Large Area ◽  
Very High Frequency ◽  
Cell Structures ◽  
Evolution Characteristics ◽  
Stable Performance ◽  
Sun Light

AbstractWe have developed high efficiency large area a-Si:H and a-SiGe:H multi-junction solar cells using a Modified Very High Frequency (MVHF) glow discharge process. We conducted a comparative study for different cell structures, and compared the initial and stable performance and light-induced degradation of solar cells made using MVHF and RF techniques. Besides high efficiency, the MVHF cells also demonstrate superior light stability, showing <10% degradation after 1000 hour of one-sun light soaking at 50 °C. We also studied light-induced defect level and hydrogen evolution characteristics of MVHF deposited a-SiGe:H films and compared them with the RF deposited films.

scholarly journals MANAJEMEN MEDIA PENYIARAN RADIO MORAFM DALAM MENINGKATKAN KUALITAS PROGRAM SIARAN RADIO DI ERA NEW MEDIA

2017 ◽  
Vol 1 (2) ◽  
pp. 33
Author(s):  
Defhany Defhany Defhany
Keyword(s):  
New Media ◽  
Optimal Management ◽  
Media Management ◽  
Broadcast Media ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Order Increase ◽  
Radio Broadcast ◽  
Broadcast Programs

This study discusses the management of Mora FM Radio broadcasting media in improving the quality of radio broadcasting programs in the New Media era. The purpose of this study is to describe the form of management of MoraFM Radio broadcast media in improving the quality of MoraFM Radio broadcasting programs. The research method used in this research is descriptive qualitative. The informants in this study were several managers and broadcasters from Radio MoraFM determined by purposive sampling. The final results derived from this research are: First, by implementing good and optimal management of radio broadcast media, Radio MoraFM can improve the quality of radio broadcast programs in the current new media era. Second, by using plans to develop radio radio broadcast media management specifically MoraFM in order increase the satisfaction of MoraFM radio listeners and increase the number of MoraFM Radio listeners, Third, improve the performance of MoraFM Radio in improving the quality of MoraFM radio broadcasting programs.

scholarly journals Realization of SFN of FM Radio broadcasting by developing high precision FM modulator

2017 ◽  
Vol 71 (12) ◽  
pp. J295-J302
Author(s):  
Masaharu Era ◽  
Kousuke Yamasaki ◽  
Makoto Kaijima ◽  
Kenji Kawano ◽  
Tomohiro Kashio ◽  
...  
Keyword(s):  
High Precision ◽  
Radio Broadcasting ◽  
Fm Radio
Sign in / Sign up

Export Citation Format

Share Document