Wireless Local Area Networks
The establishment of home and business networks desirous of upgrading to Wireless Local Area Network- WLAN confront with the problems of choosing from available alternatives. The vendors offer several products for sale that hovers around different wireless standards like 802.11a, 802.11b, 802.11g and Bluetooth. During the year 1997, the Institute of Electrical and Electronics Engineers -- IEEE developed the first WLAN standard. They termed it 802.11 in line with the name given to the group appointed for supervising its development. However, to our misfortune the 802.11 could support only a maximum bandwidth of 2 Mbps -- too slow for most applications. Due to these ordinary 802.11 wireless products could not be manufactured further. (802.11 Standards - 802.11b 802.11a 802.11g: Which one is right for You?)
The IEEE standard is an extension of the original 802.11 standard devised during July, 1999 generating 802.11b specification. While 802.11b was devised the IEEE generated a second extension to the original 802.11 standard regarded as 802.11a. Since the 802.11b was become much popular and become much faster than 802.11a, some took it for granted that 802.11a was devised only after the 802.11b. However, in reality the 802.11a was developed at a similar period. As a result of its higher costs, 802.11a was adopted widely in the business market while the 802.11b provided better services at the home market. During the period 2002 and 2003, the WLAN products supporting a new standard known as 802.11g started emerge in the scenario. The Bluetooth emerged to be an alternative wireless network technology that went through different developmental path in comparison to the 802.11 family. So as to make an educated network building decision, one is required to be aware of the comparative pros and cons of each of such technologies. (802.11 Standards - 802.11b 802.11a 802.11g: Which one is right for You?) This paper shall thus deal with a comparison of the standards of 802.11a, 802.11b, 802.11g and Bluetooth, analyzing each of their merits and demerits and arrive at a conclusion as to which is the best technology.
Discussion:
The mobile users enabled to receive Ethernet levels of performance, throughput, and availability with the application of 802.11b WLANs. The fundamental features, designing and services of 802.11b are indicated to be the original 802.11 standard. The original 802.11 DSSS standard spells out an 11-bit chipping called a Barker sequence to code all the transmitted data over the air. Each of the 11-chip sequence indicates a single data bit which is 1 or 0, and is transformed to a waveform known as a symbol that can be sent over the air. Such symbols are sent at a speed of 1 MSps or 1 million symbols per second in terms of the symbol rate measured through the technique of Binary Phase Shift Keying -- BPSK. In case of 2 Mbps, a more refined implementation known as Quadrature Phase Shift Keying -- QPSK is applied; it enhances the data rate available in BPSK to the extent of almost double through the developed efficiency in the utilization of bandwidth. (Wireless LAN (Wifi) Tutorial)
To enhance the data rate in the 802.11b standard, advanced coding techniques are employed. The 802.11b specification influences only the physical layer, supplementing higher data rates and more strong connectivity. The crucial involvement of the 802.11b supplementation to the wireless LAN standard was to regulate the physical layer support of two new speeds 5.5 Mbps and 11 Mbps. To attain this DSSS was required to be chosen as the sole physical layer technique for the standard since, as the frequency leaping cannot safeguard the higher speeds without violating current FCC stipulations. The implication is that 802.11b systems will operate internally along with the 1 Mbps and 2 Mbps 802.11 FHSS systems. (Wireless LAN (Wifi) Tutorial)
IEEE 802.11b transmits data at 1, 2, 5.5 or 11 Megabits per second -- Mbps applying the 2.4-2.5 gigahertz -- GHz S-Band Industrial, Scientific, and Medical -- ISM frequency range. To attain optimum conditions the close proximity and no sources of attenuation or interference, IEEE 802.11b seems to operate at 11 Mbps, considered to be of higher bit rate in comparison to the 10 Mbps wired Ethernet. In less than optimal conditions the slower speeds of 5.5 Mbps, 2 Mbps, and 1 Mbps are used. The 802.11b applies the same radio signaling frequency -- 2.4 GHz -- as the original 802.11 standard. (802.11 Standards - 802.11b 802.11a 802.11g: Which one is right for You?) Its operation is comparable with 802.11a and necessitates fewer access points than 802.11a for exposure of large areas. It offers high-speed access to data up to 300 feet from the base station and 14 channels are...
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