Satellite links are used to deliver long distance telecommunications such as voice or data services, broadband internet services, television broadcast and communications with remote and hard to reach locations. Satellite link consists of an uplink and a downlink. Uplink connects ground station to satellite while downlink connects satellite to the receive ground station. Signal quality in the uplink depends on how powerful the signal is transmitted from the source ground station and how the satellite receives it. On the downlink side, signal quality depends on how powerful the satellite retransmits the signal and how the ground station receives it.
The main purpose of satellite link design is to maximize link data rate while reducing the BER (Bit Error Rate) at the receiver subjects to the constraint of received power and channel bandwidth. The BER of a satellite link is a function of Eb/No, which means energy per bit noise density ratio in the information channel. A satellite communications system designer must ensure a minimum Eb/No in the receiver channels to satisfy the link BER criteria which also meet the constraints on satellite transmit power and RF bandwidth. In digital transmission, Eb/No in a baseband channel relies on C/N (carrier to noise ratio) of the receiver, the type of modulation used in the baseband channel and the channel bandwidth. Hence, the major concern in design and analysis of satellite link is to calculate and evaluate the link C/N in which C is the received carrier power in the earth station/satellite and N is the noise plus interference (caused by earth stations of adjacent satellite) power in the receiver.
Rain is the major destruction of satellite signal. Rain attenuation is a function of rain rate at ground station location and satellite link carrier frequency. Average charge of rain rate (mm/hr) of a country can be obtained from the department of Meteorology of that country. Rain effects become stern at wavelength approach the rain drop size. So you have to ensure that the satellite link can overcome the maximum attenuation induced by the rain. Hence, accurate assessment needs to have evaluating link parameters.Read More
Connecting to satellite Internet is one of the best personal decisions you will make. Of course several decisions take precedence over what you can gain from satellite Internet, but that does not discredit the benefits it will immediately provide you and your business. Satellite Internet promises dependable, high speed Internet that you will be able to trust for personal and business use. You will be quickly connected to a broadband Internet source that will make you quickly forget about life with dial-up modems. It can make you more efficient at work and happier with your personal life. Consider it just another step in making your life easier and more enjoyable.
When you connect to satellite Internet you are connecting to an Internet connection that will make you more effective at your work from home. Working from home is more and more common every year. Having the ability to connect to powerful and dependable Internet service from home is important if your career allows you to take work home. You need a fast Internet connection, and satellite Internet gives it to you. You will be able to send and receive important work emails without worrying about slow speeds or dropped connections. You will even be able to chat through the Internet with just about anyone for your business. Hold business calls online or conference calls virtually with the help of video chatting.
You will have your own private network at home, connected directly to the satellite dish installed above your home. Once you connect to satellite Internet you are connecting to an Internet connection that will make you happier when staying connected to friends and family or entertaining yourself with all the Internet has to offer. There are many ways to stay updated on your friends’ whereabouts and activities. There are social networking sites as well as video chatting available to you. In order to make those sites work smoothly, you want a high speed Internet access method. Being more connected to those most important to you in this world promises to make you a happier person. Satellite Internet can actually make you a happier person.Read More