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Questions:

1.Different antenna, such as yagi, horn, and celluar antennas, etc. has different merits. Research the set technologies in details and pay specific attention to how they are used as well their strengths and weakness.
 
2.Compare and Contrast the multiplexing techniques CDMA and FDMA in the area of wirelessnetworking?
 
3.A local Engineering group ask you to present your finding of the most recent advanced wireless technologies. Research these technologies in details and pay specific attention to how they are used aswell their strengths and weakness. 
 
 

Answers:

1.A device called an antenna which resides in an electrical circuit has the capability of converting electric power to standing radio waves which can be received by transreceivers. Interlinking of transmitter and receiver is done by antennas. Antennas hold different types of properties.

Properties of Antennas:

  • Antenna expand
  • Orifice
  • Directivity and bandwidth
  • Divergence
  • Effective length
  • Polar diagram.

Different types of antennas are needed to perform different wireless communication. Some of them are-

Horn Antenna

This type of antenna works alongside reflector as a bowl antenna powerfully as a waveguide.

Mainly microwave and satellite are embedded with horn antenna. If Normal waveguide are used for transmission then it results in standing waves. Horn antenna prevents the odd things. The more slow but sure the blaze, better could be the similarality and lesser the losses. This results in greater growth of signal.

Depending upon the blazing there are different types of horn antennas viz. pyramidal, sectoral and

Conical horn. These antennas has several merits and demerits-

  • Moderate directivity (Ease), broad bandwidth and ease of manufacturing.
  • Horn antenna operates over a good range of frequencies covering a wide area and has wide bandwidth.

Yagi Antenna

A yagi (device that receives TV and radio signals), also known as Yagi Uda organized row is an antenna that receives signal from one direction. This type of device is popular among radio stations and band radio operators. It operates over a range greater than 10megahertz.

Yagi Uda antenna uses passive elements. It can be constructed using one or more parabolic reflector elements and one or more director elements as this antenna is of low cost and greater in efficiency. This type of antennas can be made by using an antenna with one reflector, a driven folded-dipole, and directors, mounted for horizontal schism in the presumptuous direction.

 

Pros of yagi antenna

  • Yagis have more gain than similarly sized log periodic antennas which gives them a good range.
  • They are easily mountable at low cost.

Cons of yagi antenna

  • These antennas have limited bandwidth or frequency.
  • As you move away from the limited frequency range, the graph shows degradation in gain and impedance. This is because yagis are based on echoing elements.

Cellular Antenna

It is used in cellular network or mobile network. In this, the network cells is scattered over the area, connected three base stations and a fixed transreceiver. These base stations provide network coverage which can be used for all types of communication. A cell is combined with other neighbouring cells at different frequencies providing a hassle free quality service with each cell. This combination of cells provides cover a wide range geographic area. A large number of devices can communicate through these cells moving through one or more base stations.

Merits

  • These types of antennas consume less power and are robust in nature.
  • Limited interference for small cells and large number of interfering signals for huge cells.

Demerits

  • In case of small cells complex infrastructure is required to connect to base station. Infrastructure consists of switches for call forwarding, location etc.
  • Frequency spectrum should be distributed properly to avoid interference.

Electronics is focused on communications. Telegraph started in 1845, calling in 1876, but communications really became popular with the introduction of wireless and the vacuum tube. Today wireless technology and vacuum tube are in domination. Traditionally one antenna works together with each one or perhaps a few different frequencies. Now technology is so much advanced that we can combine small antennas to interact at any frequency. In this way every application like GPS, Bluetooth don’t need their specific antennas. In fact most of the data can be shared by one digitally controlled antenna.

Thus, these antennas will be replaced by digitally controlled antennas resulting in higher bandwidth and good range.:-

2.CDMA

  • Code division multiple access (CDMA) is a method of various radio communication stations for multiple access and through the use of several transmitters we can send information simultaneously over an individual network.

There are several features of CDMA which differs from FDMA. They are-

  • Simultaneous transmission occurs over same frequency employed by every user.
  • Wide band spreading signal called codeword is combined with narrow band signal.
  • Separate codeword is used for every other user.
  • Specified codeword is understandable to user and other signals becomes noise to them.
  • Transmitters and receiver should have a bond so that after transmission receiver can understand the concerned codes.

FDMA

It is a channelization protocol used to manipulate multiple access protocol. One or several frequency bands, or channels allocated to user by FDMA. It is very commonplace in satellite communication. Like other multiple access systems FDMA coordinates access between multiple users. If channel is not in use, it goes in idle state.

  • Bandwidth of Channel is narrow, referred to as narrowband system.
  • FDMA uses analog links.
  • Continuous transmission doesn’t require synchronization.
  • To reduce interference tight filtering is done.
  • Frequency division multiple access is coupled with FDD

3.Newest advanced wireless technologies are:-

  • 5th Generation- It is the continuous innovation and evolution of industry resulting in better network congestion, energy efficiency, cost, reliability, and link with billions of people and devices.
  • Optical Fibre everywhere- It is the propelled by efforts resulting in very fast connectivity and surfing of high definition videos.
  • Virtualization Software defined network.
  • Everywhere connectivity for Internet of things & Internet of Everything. 
  • Cognitive networks and Big Data- All data generated by mobiles, embedded devices and network protocols are handled by communication systems. It is a vast level of information. A world IP backbone produces 1TB of IPs daily. This Big data is managed by advance systems.
  • Cyber Security- 2015 was remarkable that everything can undoubtedly be hacked. So coming year will need significant changes on the systems.
  • Smarter Smartphones and connected sensors- Coming days will be new trend for the smart phones and sensors.
  • Network Neutrality and internet governance- No blocking and internet for everyone will be the future.
 

References

https://www.rfwireless-world.com/Terminology/Types-of-Antenna.html

https://www.aalto.fi/en/about/for_media/press_releases/2016-08-31-002/

https://www.tutorialspoint.com/cdma/questions_and_answers.html

https://en.wikipedia.org/wiki/Frequency-division_multiple_access

https://www.comsoc.org/blog/top-10-communications-technology-trends-2015

https://onlinetalentlab.nl/trends-online/

OR

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