Introduction to Wireless Communication Systems.pptx

Introduction to Wireless

1. Introduction to Wireless Communication Systems

2. Wireless Communication Wireless Communication, simply referred to as wireless, is a type of communication method that allows for the exchange of information between two or more points without need for any physical connection like electric cable or wire. Instead , the wireless communication uses electromagnetic waves at radio or micro frequencies . Wireless communication is serving as the backbone of today's Internet and mobile communication. It can be used to provide communication over a wide range of distances, from a few meters like in Bluetooth technology to several thousand kilometers like the Internet.

3. Evolution of Wireless Communication Evolution of Wireless Communication As a medium for information exchange, wireless communication has been around for more than a century. The key milestones in the evolution of wireless communication are highlighted in the following table

4. Block Diagram of Wireless Communication

5. Information Source − It is the device that generates information that has to be transmitted. Examples of information source in wireless communication can be a mobile phone, computer, POS device, etc . Source Encoder − This component is responsible for encoding the information from the source into a form that can be transmitted through the channel. Channel Coder − This component adds extra bits to the original information to protect it from errors during transmission . Modulator − It transforms the information into a signal suitable for transmission over the wireless communication channel. It combines the information signal with a carrier signal of higher energy . Multiplexe r − This component combines multiple signals into one signal to improve transmission efficiency and resource utilization. Propagation Channel − It is the wireless medium through which information signals travel to the destination. In wireless communication, air or free space is used as the propagation channel . Equalizer − This component is employed for compensating the distortions in the information signal that might be caused during transmission through the propagation channel.

6. Demodulator − The demodulator is used in wireless communication to retrieve the original information from the received modulated signal. It separates the information signal from the carrier signal. Channel Decoder − This component is provided to remove the extra bits added by the channel coder during transmission. Source Decoder − This component performs reverse process of the source encoder and reconstructs the original information message sent by the information source. Information Sink − It represents the destination of the transmitted information and is the device that receives the message

7. Types of Wireless Communication Networks Depending on the needs, there are several different types of wireless communication systems/networks present. 1. Wireless LAN Wireless LAN (Local Area Network), also referred to as WLAN, is a wireless communication network that makes the use of radio waves to connect different nodes in the network . It is used within a limited area like in a home or office. Wi-Fi is a common example of wireless LAN. 2. Wireless WAN , also known as Wireless Wide Area Network (WWAN), is a large-scale wireless communication network that connects devices over wide areas like across cities or entire country. It is also known as mobile broadband. For wireless connectivity . It uses cellular technologies such as 3G, 4G, 5G, etc. Mobile internet and voice over internet protocol are common examples of wireless WAN.

8. 3. Wireless MAN Wireless MAN , also known as Wireless Metropolitan Area Network (WMAN), is a wireless communication network which is larger than WLAN but smaller than WWAN. This network is designed to provide wireless connectivity within a city or neighboring cities. 4. Fixed Wireless Networks - used to provide internet facilities to homes and businesses in rural areas or areas where physical connectivity becomes uneconomical. Fixed wireless networks are generally used as the alternatives of satellite communication in remote areas. 5 . Wireless PAN Wireless PAN or Wireless Personal Area Network - a type of wireless communication system that used to connect devices within a very short range. It is used in personal areas like within a room or house. Bluetooth is a common example of WPAN.