Do you Know about Bluetooth , Wi-Fi and Li-Fi deeply?

Do you know about Bluetooth, Wi-Fi and Li-Fi?

Don't be worried. Don't know about these latest technology, I will deeply explain to you and I'll will discuss about working procedure of these wireless communication.So , Let's Go........

Bluetooth 

Bluetooth wireless technology was named after a Danish Viking and King, Harald  Blatand; his last name means “Bluetooth” in English. He is credited with uniting Denmark and Norway, just as Bluetooth wireless technology is credited with uniting two disparate devices.

The Bluetooth technology emerged from the task undertaken by Ericsson Mobile Communications in 1994 to find alternative to the use of cables for communication between mobile phones and other devices. In 1998, the companies Ericsson, IBM, Nokia and Toshiba formed the Bluetooth Special Interest Group (SIG) which published the 1st version in 1999.

The first version was 1.2 standard with a data rate speed of 1Mbps. The second version was 2.0+EDR with a data rate speed of 3Mbps. The third was 3.0+HS with speed of 24 Mbps. The latest version is 4.0.

How Bluetooth Works: 

Bluetooth Network consists of a Personal Area Network or a piconet which contains a minimum of 2 to maximum of 8 bluetooth peer devices- Usually a single master and upto 7 slaves. A master is the device which initiates communication with other devices. The master device governs the communications link and traffic between itself and the slave devices associated with it. A slave device is the device that responds to the master device. Slave devices are required to synchronize their transmit/receive timing with that of the masters. In addition, transmissions by slave devices are governed by the master device (i.e., the master device dictates when a slave device may transmit). Specifically, a slave may only begin its transmissions in a time slot immediately following the time slot in which it was addressed by the master, or in a time slot explicitly reserved for use by the slave device.

The frequency hopping sequence is defined by the Bluetooth device address (BD_ADDR) of the master device.  The master device first sends a radio signal asking for response from the particular slave devices within the range of addresses. The slaves respond and synchronize their hop frequency as well as clock with that of the master device.

Exchanging of multimedia data like songs, videos, pictures can be transferred among devices using Bluetooth.

Wi-Fi:

Wi-Fi is one of the most important technological developments of the modern age. It’s the wireless networking standard that helps us enjoy all the conveniences of modern media and connectivity at the tips of our fingers without astronomical cellular data charges. 

The term “Wi-Fi” is a marketing name, but it stands for “wireless fidelity.” Similar to other wireless connection types, like Bluetooth, it’s a radio transmission technology that’s built upon a set of standards to allow high-speed and secure communications between a wide variety of digital devices, access points, and hardware. It makes it possible for Wi-Fi capable devices to access the internet without the need for restrictive wires.

It can operate over short and long distances, be locked down and secured, or open and free. It’s incredibly versatile and yet is easy enough to use that it’s found in the most popular of consumer devices. Wi-Fi is ubiquitous and exceedingly important for the way we operate our modern connected world.

HOW DOES WI-FI WORK?

Although Wi-Fi is typically used to access the internet on portable devices like smartphones, tablets, or laptops, in actuality, Wi-Fi itself is used to connect to a router or other access point which in turn provides the internet access. Wi-Fi is a wireless connection to that device, not the internet itself. It also provides access to a local network of connected devices, which is why you can print pictures wirelessly or look at a video feed from Wi-Fi connected cameras with no need to be physically connected to them.

Instead of using wired connections like Ethernet, Wi-Fi uses radio waves to transmit information at specific frequencies, most typically at 2.4GHz and 5GHz, although there are many others used in more niche settings. Each frequency range has a number of channels which wireless devices can operate on, helping to spread the load so that individual devices don’t see their signals crowded or interrupted by other traffic — although that does happen on busy networks. The typical range of a standard Wi-Fi network can reach up to 100 meters in the open air. Buildings and other materials reflect the signal however, making most Wi-Fi networks far narrower than that. Typically 10-35 metres is more common. The strength of the antenna and the frequency broadcast can also impact the effective range of the network. Higher frequencies like 5GHz and 60GHz have far shorter effective ranges than 2.4GHz.

What is LiFi?

LiFi provides a completely new layer of wireless connectivity within existing heterogeneous radio frequency (RF) wireless networks. LiFi supports multiuser access and enables roaming. It is, therefore, a truly mobile system. Multisuer access and mobility support in LiFi require unique building blocks as outlined in the figure below.  Techniques developed for RF systems cannot be applied direct as the signal propagation and information encoding techniques are different. However, the differences diminish as higher frequencies in RF are used such as mm wave bands. The paper also describes the first LiFi transmitter and receiver ASICs (application specific integrated circuits) developed at the University of Edinburgh as part of the UP-VLC project. These ASICs allow real-time data transmission of 1 Gbps as well as support multiple-input-multiple-output (MIMO) operation and wavelength division multiplexing (WDM). LiFi fulfils many key performance indicators (KPI) postulated for 5G systems.

Li-Fi is similar to Wi-Fi except that it uses light waves to transmit data rather than radio technology. The reasoning behind this technology is quite simple. The radio spectrum is not as vast as the light spectrum and has every chance of being overloaded in the future. With the light spectrum, the possibilities are endless and the spectrum is larger than the radio spectrum can even hope to be.

Li-Fi better than Wi-Fi?

The capacity of the light spectrum is nearly 10,000 times greater than the available radio spectrum, which means that there is scope for faster internet, better connectivity, and is more reliable than compared to 4G, LTE, and Wi-Fi. But this doesn’t mean that the coming of Li-Fi will render these technologies obsolete; Li-Fi strives to work with them to make them better than they currently are. Since Li-Fi uses light to deliver internet connectivity, it surpasses the limitations of the radio spectrum and can be used in aricrafts, hospitals, and harmful environments. The very fact that you can use light for your internet needs rather than search for the Wi-Fi signal is reason to cheer.