Bluetooth vs. WiFi which is the superior?

Nowadays we often hear about the wireless data transmission technology. But what is meaning of wireless network. Let us review together about the advantages and disadvantages of them.

Emerging wireless technologies today that Bluetooth and Wifi (Wireless Fidelity) are both devices that can connect the device via the wireless network. Here's an explanation of Bluetooth and Wifi.

Bluetooth

Bluetooth is a wireless communication technology that operates in the 2.4 GHz ISM radio frequency to connect a separate handheld devices (mobile phones, PDAs, computers, printers, etc.) with a relatively short range.

Bluetooth operates in the 2.4 GHz frequency band using a frequency hopping traceiver capable of providing voice and data communication services in real time between bluetooth's hosts with limited distance. The downside of this technology is a short range and low data transfer capabilities.

The History of Bluetooth

Beginning of Bluetooth is a wireless communication technology (without cable) that operate in the frequency band 2.4 GHz unlicensed ISM (Industrial, Scientific and Medical) by using a frequency hopping transceiver is capable of providing voice and data communication services in real-time between bluetooth host-host with limited service reach distance (around 10 meters). Bluetooth card that uses radio frequency IEEE 802.11 standard with a limited range of services and lower ability to transfer data from card to Wireless Local Area Network (WLAN).

Bluetooth formation promoted by five major companies Ericsson, IBM, Intel, Nokia and Toshiba formed a Special Interest Group (SIG). In July 1999 , Bluetooth's document specification version 1.0 was launched. In December 1999 Bluetooth's development document with specification version 2.0 begins again with the addition of four new promoter namely 3Com, Lucent Technologies, Microsoft and Motorola. Currently, more than 1800 companies in various fields to join in a consortium as bluetooth technology adopter. Although the standard Bluetooth SIG is currently 'owned' by the promoter group, but he is expected to become an IEEE standard (802.15)

Bluetooth was derived by the name of the king at the end of ten centuries, Harald Blatand which in England is also called Harald Bluetooth was probably due to dark-colored teeth. He was the king of Denmark who has managed to unite the tribes that previously fought, including the tribes of the region now called by Norway and Sweden. Even the Scania region in Sweden, where Bluetooth technology is found also include territories. King's ability as a unifier is also similar to bluetooth technology now that can connect various devices such as personal computers and mobile phones.

Bluetooth's logo comes from the unification of Germany which is analogous to the two letters with the letter H and B (short for Harald Bluetooth), namely

(Hagall) dan

(Blatand) combined.

The Characteristic of Bluetooth

Work on the Physical Layer using Frequency Hopping Spread Spectrum (FHSS).
Frequency data width from 2.4 to 2.4835 GHz (ISM band).
Frequency hops 1600 hop / sec .
Data transmission speed of 1 Mbps (raw).
The maximum range can reach about 10 meters or 30 feet.
Provides communications services or communications point to point point to multipoint.
The existence of data encryption.
User's authentication.
Output power control

Bluetooth prefer a method FHSS (Frequency Hopping Spread Spectrum) compared with DSSS (Direct Sequence Spread Spectrum). This is the reason of it :

FHSS requires power consumption and lower complexity compared to DSSS this is because the DSSS uses a chip rate (chip rate) compared to the symbol rate (symbol rate) used by the FHSS, so the cost required to use the DSSS will be higher.
FHSS uses FSK where the resistance to noise is relatively good compared with that typically uses DSSS OPSK (for IEEE 802.11 2 Mbps) or CCK (11 Mbps IEEE 802.11b).

Although FHSS has a distance range and data transfer that is lower than the DSSS but for the services below 2 Mbps FHSS can provide cost-effective solutions are better.

The Advantages of Bluetooth system are:

Bluetooth can penetrate walls, boxes, and various other obstacles, although the distance of transmission is only about 30 feet or 10 meters.
Bluetooth does not require a cable or wire.
Bluetooth can synchronize the databases of cell phone to a computer.
Can be used as an intermediate modem

The Disadvantages of Bluetooth system are:

This system uses the same frequency with the wave of the standard LAN.
If in a room is too many Bluetooth connections are used, it would be difficult for users to find the expected recipients.
Many Bluetooth security mechanisms that must be observed to prevent the failure of transmission or reception of information.
Been circulating viruses spread via bluetooth from your mobile phone

WiFi

Wi-Fi is short for Wireless Fidelity, which has the sense of a set of standards used for of Wireless Local Area Networks (WLAN) based on IEEE 802.11 specification. The latest standards of specification 802.11a or b, such as 802.11 g, is currently in preparation, the latest specification offers many improvements ranging from broad coverage even further up to speed transfer

Wi-Fi was originally intended for the use of wireless devices and Local Area Network (LAN), but now more widely used for accessing the internet. This allows anyone with a computer with a wireless card (wireless card) or personal digital assistant (PDA) to connect to the internet using access point (otherwise known as hotspots) nearby.

Wi-Fi was designed based on the IEEE 802.11 specification. Today there are four variations of the 802.11, namely:

802.11a
802.11b
802.11g
802.11n

802.11b is the first product specification Wi-Fi. 802.11g and 802.11 product that have the most sales in 2005.

**Wi-Fi Specification**
Specification	Speed	Freq Band
802.11b	11 Mb/s	~2.4 GHz
802.11a	54 Mb/s	~5 GHz
802.11g	54 Mb/s	~2.4 GHz
802.11n	100 Mb/s	~2.4 GHz

Connection Mode of WiFi

Ad-Hoc

This connection mode is a mode where multiple computers are connected directly, or better known as Peer-to-Peer. The advantage, cheaper and more practical when connected only 2 or 3 computers, without having to buy an access point.

Infrastructure

Using the Access Point that serves as a regulator of the data traffic, allowing many clients can connect to each other through the network.

WiFI Security
There are several types of security settings for the Wi-Fi, among others:

The Conclusion of Bluetooth vs. WiFi which is the superior?

In principle either Bluetooth or WiFi has advantages and disadvantages of each.

     Bluetooth uses FHSS transmission system that enables the data transmission process so that the battery energy savings would be more efficient when embedded in mobile phones and PDA systems in comparison with WiFi.
     But in terms of scope and magnitude of the maximum data capacity that can be sent WiFi with DSSS transmission method further favored because it is capable of transmitting large amounts of data and relatively greater range than Bluetooth
     Bluetooth works within the scope of the PAN (Private Area Network) so that the level of data security is more secure than WiFi which by default are in a public environment. So in a WiFi network security breaches are more common than Bluetooth
     Bluetooth signals can penetrate the wall so it will not reduce the unobstructed meskipin speed data transmission, while the WiFi transmission speed will be reduced if the signal is obstructed by other objects because the object hit the incoming signal will be reflected back so that the signal received in an enclosed space less than in the open.

From the above we can conclude in a condition likely Blutooth is superior, but in other conditions that WiFi was the more trustworthy.

Posted by : Alir Retno , Informatics Engineering of STMIK Akakom Yogyakarta
Source : Wikipedia , http://ourn0tes.wordpress.com

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