Wireless n IEEE 802 .11 n g

         802 .11n is a recent change that developed earlier by adding 802.11 MIMO (multiple input multiple output) and some other features. Another ability MIMO technology is providing Spatial Division Multiplexing (SDM). HR spatial multiplexes multiple independent data streams, transferred simultaneously within one spectral channel bandwidth.

         MIMO SDM can increase the throughput of data such as the number of data spatial streams the resolution is improved. Each spatial stream requires a separate antennas at both the transmitter and receiver. In addition, MIMO technology a separate radio frequency chain and analog-to-digital converter to the antenna MIMO masingmasing that change the cost of the execution become higher compared to non-MIMO systems.

         Coupling MIMO architecture with wider bandwidth channels offers to improve the physical transfer rate exceeds the 802 .11A (5 GHz) and 802.11 g (2.4 GHz). 40 MHz channel is another feature that is incorporated into 802 .11n which doubles the width of 20 MHz channels in 802.11 PHY prior to sending data. This allows for doubling of data speed PHY exceed one 20 MHz channel. 

        It can be activated in 5 GHz mode, or in 2.4 GHz if there is knowledge that will not interfere with some of the other 802.11 or non-802.11 systems (such as Bluetooth) using the same frequency. The IEEE has approved and have been released and d published in October 2009. With the advent of 802 .11n has been disetejui by the manufacturers of devices that support this technology.

       802 .11n is working on two types of frequency, i.e. 2.4 and 5 GHz. When compared to the previous version i.e. 802.11 g, which has a raw data rate of 54Mbit/s then there is a very significant increase in 802 .11n. 802 .11n can penetrate a raw data rate of up to 600 Mbit/s with 40 MHz channel width.

Wireless g (IEEE 802.11 g)

IEEE 802.11 g is a wireless networking standard that works at a frequency of 2.45 GHz and using the method of modulation on. 802.11 g, published in June 2003, capable of achieving speeds of up to 54 Mb/s at 2.45 GHz frequency bands, as well as IEEE 802.11 and IEEE 802 .11b. This standard uses the modulation signal on, making it more resistant against interference from other waves.

Standard 802.11 g is basically similar to the 802 .11A standard, namely providing high speed communication lines up to 54 Mbps. However, the frequencies used in the standard is the same as the frequencies used standard 802 .11b 2.4 GHz wave frequency that is and can also be compatible with the 802 .11b standard. It is not owned by the standard 802 .11A.

Like the standard 802.11. a, 802.11 g standard devices using modulated on to acquire high-speed data transfer speed. Unlike devices in the standard 802 .11A, 802.11 g standard devices can automatically switch to the quadrature phase shift keying (QPSK) to communicate with devices on the wireless network that uses 802 .11b standard. Compared to 802 .11A, 802.11 g turns out to have advantages in terms of compatibility with the standard 802 .11b networks.

802.11 g standard has some sensitivity to speeds according to the table 2. the advantages of 802.11 g has a fast maximum speed, a good signal range and isn't easily obstructed. While the shortcomings of 802.11 g is costing more than 802 .11b, the equipment can interfere with the signal at a frequency that is not set.

Standard 802.11 g offers high bandwidth (54 Mbps maximum throughput, 30 Mbps in practice) in the frequency range 1.5 GHz. Standard 802.11 g is backwards compatible with standard recoil-802 .11b, which means that the device supports the 802.11 g also works with 802 .11b.

However, problems may arise when the 802.11 g standard devices try to switch to 802 .11b network or even reverse the interference in issue was kaftans by the use of a frequency of 2.4 GHz. Because as explained in the beginning that the frequency of 2.4 GHz is a frequency that is most widely used by other wireless-based devices.

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