Second Chapter Lesson-6: Wireless Communication System.

At the end of this lesson-

  • 1. You will be able to describe wireless communication system. 
  • 2. You will be able to explain the importance of wireless communication system. 
  • 3. You will be able to explain Bluetooth technology.
  • 4. You will be able to explain Wi-Fi technology.
  • 5. You will be able to explain WiMAX technology. 

 

There are various types of wireless communication system developed based on the use of different electromagnetic waves for data transmission. Such as:

  • Radio wave based system: Wi-Fi, Mobile, Bluetooth
  • Microwave based system: WiMax
  • Infrared based system: Lifi, IrDA

 

Bluetooth: It is a wireless technology based on Ad-hoc technology also known as Ad-hoc Pico nets, which is a Personal Area Networks (PANs) with a very limited coverage.

IEEE has approved a Bluetooth based standard named IEEE 802.15.1 for Wireless Personal Area Networks (WPANs). IEEE standard covers MAC and Physical layer applications. Bluetooth employs Radio Frequency (RF) for communication. It makes use of frequency modulation to generate radio waves in the ISM band.

When more than two Bluetooth devices communicate with one another, this is called a PICONET. A Piconet can contain up to seven slaves clustered around a single master. The device that initializes establishment of the Piconet becomes the master.

Each device can communicate simultaneously with up to seven other devices within a single Piconet.

Advantages of Bluetooth:

  • It is wireless.
  • It is cheap.
  • It is easy to install.
  • It is free to use if the device is installed with it.

Disadvantages of Bluetooth 

  • It is a short-range communication network.
  • It connects only two devices at a time.

 

WiFi: WiFi stands for Wireless Fidelity. It is based on the IEEE 802.11 family of standards and is primarily a Wireless Local Area Networking (WLAN) technology designed to provide in-building broadband coverage.

WiFi has become the de facto standard for last mile broadband connectivity in homes, offices, and public hotspot locations. Systems can typically provide a coverage range of only about 1,000 feet from the access point.

WiFi is Half Duplex:

All WiFi networks are contention-based TDD systems, where the access point and the mobile stations all vie for use of the same channel. Because of the shared media operation, all WiFi networks are half duplex.

There are equipment vendors who market WiFi mesh configurations, but those implementations incorporate technologies that are not defined in the standards.

Channel Bandwidth:

The WiFi standards define a fixed channel bandwidth of 25 MHz for 802.11b and 20 MHz for either 802.11a or g networks.

Radio Signals:

Radio Signals are the keys, which make WiFi networking possible. These radio signals transmitted from WiFi antennas are picked up by WiFi receivers, such as computers and cell phones that are equipped with WiFi cards.

WiFi Hotspot:

A WiFi hotspot is created by installing an access point to an internet connection. The access point transmits a wireless signal over a short distance. It typically covers around 300 feet. When a WiFi enabled device such as a Pocket PC encounters a hotspot, the device can then connect to that network wirelessly.

 

WiMAX: WiMAX stands for Worldwide Interoperability for Microwave Access. Based on Wireless MAN technology. A wireless technology optimized for the delivery of IP centric services over a wide area. A scalable wireless platform for constructing alternative and complementary broadband networks.

WiMAX is such an easy term that people tend to use it for the 802.16 standards and technology themselves, although strictly it applies only to systems that meet specific conformance criteria laid down by the WiMAX Forum.

Why WiMax?

  • WiMAX can help service providers meet many of the challenges they face due to increasing customer demands without discarding their existing infrastructure investments because it has the ability to seamlessly interoperate across various network types.
  • WiMAX can provide wide area coverage and quality of service capabilities for applications ranging from real-time delay-sensitive voice-over-IP (VoIP) to real-time streaming video and non-real-time downloads, ensuring that subscribers obtain the performance they expect for all types of communications.
  • WiMAX, which is an IP-based wireless broadband technology, can be integrated into both wide-area third-generation (3G) mobile and wireless and wireline networks allowing it to become part of a seamless anytime, anywhere broadband access solution.

 

Lesson Evaluation-

Knowledge Based Questions:

  • a. What is hotspot?
  • a. What is Bluetooth?
  • a. What is WiFi?
  • a. What is WiMAX?

Comprehension Based Questions:

Creative Questions:

Multiple Choice Questions:

 


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