Wireless Transmission
1. Radio: Radio is a common term that is used for any kind of frequency. But much higher frequencies are usually termed as microwave and the lower frequency band can be called radio frequency. There are a lot of application of radio. For instance, cordless keyboard, wireless LAN and wireless Ethernet etc. but it is limited in range to only a few 100 meters. Depending on frequency radio offers different bandwidths.
2. Terrestrial microwave: In terrestrial microwave two antennas are used for communication. A focused beam comes out from an antenna and is received by the corresponding antenna, given that antennas should be facing each other with no barrier in between. For this reason antennas are situated on tall towers. Due to curvature of earth terrestrial microwave can be used for long distance communication with large bandwidth. Telecom department is also using this for long distance communication. An advantage of wireless communication is that it is not essential to lay down wires in the city hence no permissions are required.
3. Satellite communication: Satellite works as a switch in sky. On earth VSAT(Very Small Aperture Terminal) are used to transmit and receive data from satellite. normally one station on earth emits signal to satellite and it is received by many stations on earth. Satellite communication is normally used in those places where it is very difficult to obtain line of sight i.e. in highly asymmetrical terrestrial regions. In case of noise wireless media is not as good as the wired media. There are frequency ranges in wireless communication and two stations should not be allowed to transmit simultaneously in a frequency range. The most promising advantage of satellite system is broadcasting. If satellites are used for point to point communication then they are expensive as compared to wired media.
Data Encoding
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