Despite over seventy years of broadcasting, Radio Nigeria (FRCN) network signals still have poor reception and sometimes total failure. Apart from the problems of attenuation, fading, distortion, interference and noise, which are age-long problems militating against the performance of a digital communication system, radio communications engineers also face some new challenges arising from bandw...

Swedish community radio started in 1979 and was the first type of broadcast to be organised outside public service monopoly that had been operation since 1924. This article unveils some aspects history radio. Through analysis first-hand sources from period between 1985, sheds new light on by using archives parliamentary committee setting up radio, inquiries, minutes other political discourse Th...

We study distributed broadcasting protocols with few transmissions (‘shots’) in radio networks where the topology is unknown. In particular, we examine the case in which a bound k is given and a node may transmit at most k times during the broadcasting protocol. Initially, we focus on oblivious algorithms for k-shot broadcasting, that is, algorithms where each node decides whether to transmit o...

We consider broadcasting in radio networks that are subject to permanent node failures of unknown location. Nodes are spread in a region in some regular way. We consider two cases: nodes are either situated at integer points of a line or they are situated on the plane, at grid points of a square or hexagonal mesh. Nodes send messages in synchronous time-slots. Each node v has a given transmissi...

The move to digital is a natural progression taking place in all aspects of broadcast media applications from document processing in newspapers to video processing in television distribution. This is no less true for audio broadcasting which has taken a unique development path in the United States. This path has been heavily influenced by a combination of regulatory and migratory requirements s...

We study the time of distributed deterministic broadcasting in synchronous radio networks of unknown topology and size. If a node u can be reached from two nodes which send messages in the same round, none of the messages is received by u. We assume that nodes are completely ignorant of the network: they know neither its topology, nor size, nor even their immediate neighborhood. The initial kno...

We consider ad hoc radio networks in which each node knows only its own identity but is unaware of the topology of the network, or of any bound on its size or diameter. Acknowledged broadcasting (AB) is a communication task consisting in transmitting a message from a distinguished source to all other nodes of the network and making this fact common knowledge among all nodes. To do this, the und...

Technical investigations suggest that DRM+ is a suitable candidate for the transition from analogue FM to digital broadcasting in VHF band II (87.5 108.0 MHz) in Europe [2]. Unfortunately, there are mainly three major problems to solve: 1. VHF band II is historically defined for the use of analogue FM sound broadcasting, and, it is – as such – extensively used in Europe; 2. the lack of agreed c...

We probed for Radio Frequency Interference (RFI) for the three potential Galactic Emission Mapping Experiment (GEM) sites at Portugal using custom made omnidirectional disconic antennas. For the installation of a 10-meter dish dedicated to the mapping of Polarized Galactic Emission foreground planned for 2005-2007 in the 5-10 GHz band, the three sites chosen as suitable to host the antenna were...