One of the most important components of any mobile system is the antenna; antenna design can overcome or cause a number of problems that then must be addressed at other technology layers. Modern mobile platforms are beginning to include novel antenna technology such as MIMO and beam steering; these technologies increase the complexity of evaluating the effectiveness of topology formation algorithms,
routing and overall performance due to the large number of configuration states the system ...

Energy conservation is a critical issue in wireless ad hoc networks since batteries are the only energy source to power the nodes. One major metric for energy conservation is to route a communication session along the routes which require the lowest total energy consumption when all nodes are equipped with a finite and nonrenewable amount of energy. To explore advantages offered by the use of directional antennas, we consider the case of source initiated multicast traffic in wireless ad hoc ...

The communications subsystem is perhaps the most vital aspect of the operation of a spacecraft. The communications system provides the only link between an operational vehicle and the ground control station or other satellites. Examples of communicated data can include scientific research, telemetry, payload results, or relayed information from other spacecraft. This subsystem plays a crucial role in the proper functioning of the space system.

The paper discusses technical innovation and development in different satcom areas, and then offers some strategic considerations and detailed suggestions for China satcom industry.

This paper is intended to give an overview of that methods of and uses for satellite communictations,in addition to presenting recent trends and future directions in the field.