The applications and requirements of wireless services
Introduction to Wireless
A wireless communication can be thought of to be as transmission of information between two or more points which are not connected through any wired media. The common communicating methods include radio waves and IR (InfraRed Waves) and Visible liight and ultrasonic waves. Common applications include radio signals,mobile networks like bluetooth and WiMax, Wifiand, even deep space radio communications mediums.Some alternative examples of applications of wireless technology include GPS units like wireless computer mouse, keyboards and headsets and garage door openers and headphones like radio receivers, broadcast television,satellite television and cordless telephones.
History Of Wireless Communication
1. The Photophone : It is the 1st true wireless mechanism was designed by Alexander Graham Bell and Charles Tainter which is called the photophone that uses modulated lightbeams to transfer speech signals. An era with no electricity and laser did not gain much popularity then but now this is the fundamental principle in millitary and fiber optic communication.
2. The radio: This term “wireless” came into public use to refer to a radio receiver or transceiver establishing its usage in the field of wireless telegraphy . But now that term is used to describe modern wireless connections like cellular networks and wireless broadband internet. This is also used in a general sense for operations that are implemented without the use of wires such as “wireless energy transfer” or “wireless remote control” that isregardless of the specific technology used is (i.e radio, infrared, ultrasonic) .
Basic requirements for wireless Setup-
- Source: The source is a device which generates signal for transmission which can be itself a source or a transducer which converts physical phenomena like temperature,pressure to electrical or optical signals during communication.
- Transmitter and Modulator : This is a device which modulates the source signal onto an energetic carrier wave for transmission purposes during transmission.
- Channel: It is the transmission media which carries the modulated wave during transmission.
- Receiver and Demodulator : These are the counterpart of the transmitter that separates the message signals from the received signal.
The Socio-Economic Impacts of Wireless Communication
Social Impact :
- The improvement in social links
- The creation of social capital or social empowerment
- Using of mobile phones during emergencies
- The Reduced need to travel
- The Improvement in market information flows
- The Reduction in price discrepancies
- Less spoilage of the resources
- TheIncreased business opportunities
- The Improving productivity
- The Better employment oppourtunity
- The Increase in GDP and Foreign Direct Investment
Important Questions And Answers:
1.What are the Harmful effects of Electromagnetic radiation?
Ans. The effects can be classified into 3 distinct categories that are Electrical, Fire and Biological Hazards.The electrical effects include overloading and consequent destruction of electric and electronic devices. The fire hazards are caused due to sparks in the vicinity of easily ignitable substances.The biological hazards are the ones caused due to prolong or short exposure to strong radiation that may range from small burns and blisters to cancer or leukemia.
2. Mention the popular uses of wireless.
Ans. The mobile communication and satellite broadcasting are by far the most common applications. The other possible applications include Wifi, wireless sensor nodes,wireless energy transfer.