WIRELESS NETWORKS AND MOBILE IP
WIRELESS NETWORKS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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omnidirectional frequency division multiple access
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orthogonal frequency duplex multiple access
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orthogonal frequency divider multiple access
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orthogonal frequency division multiple access
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Detailed explanation-1: -Orthogonal frequency-division multiple access (OFDMA) is a multi-user version of the popular orthogonal frequency-division multiplexing (OFDM) digital modulation scheme. Multiple access is achieved in OFDMA by assigning subsets of subcarriers to individual users.
Detailed explanation-2: -What is orthogonal frequency-division multiplexing (OFDM)? Orthogonal frequency-division multiplexing is a method of data transmission where a single information stream is split among several closely spaced narrowband subchannel frequencies instead of a single Wideband channel frequency.
Detailed explanation-3: -In OFDM, the subcarrier frequencies are chosen so that the subcarriers are orthogonal to each other, meaning that crosstalk between the sub-channels is eliminated and inter-carrier guard bands are not required.
Detailed explanation-4: -Orthogonal multiple access (MA) techniques harmonize the access of multiple users to the network, thus preventing the collision of transmissions from different users.