Wireless Encoding and Nonoverlapping DSSS Channels

Wireless Encoding and Nonoverlapping DSSS Channels

Wireless encoding refers to the method used to encode the data that is transmitted wirelessly. There are various encoding techniques used in wireless networks such as Direct Sequence Spread Spectrum (DSSS), Frequency Hopping Spread Spectrum (FHSS), and Orthogonal Frequency Division Multiplexing (OFDM).

DSSS is one of the most widely used encoding techniques in wireless LANs. It works by spreading the signal across a wider frequency band than is actually needed to transmit the data. This provides some resilience to interference and allows the signal to be recovered even if some of the bandwidth is being used by other devices.

In wireless LANs, there are 14 channels designated for use in the 2.4 GHz frequency band. These channels are spaced 5 MHz apart, but because of the DSSS technique used in 802.11b and 802.11g wireless LANs, the channels actually overlap with each other. As a result, only channels 1, 6, and 11 are nonoverlapping, meaning they can be used at the same time without causing interference with each other. It is important to select the right channel to minimize interference and maximize throughput.

In addition to DSSS, there are other encoding techniques used in wireless LANs such as FHSS and OFDM. FHSS works by changing the frequency of the signal rapidly and randomly over a wide range of frequencies. This provides some resistance to interference, but is not as efficient as DSSS. OFDM, on the other hand, uses multiple sub-carriers to transmit data simultaneously, providing a more efficient use of the frequency band. It is used in the 802.11a and 802.11n wireless LAN standards.

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