to avoid the interference from one system to other system
da-fdma
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The basic difference between OFDMA and SC-FDMA is that, there there is an additional block of N point DFT before the sub-channel mapping in SC-FDMA. This will effectively reduce the PAPR, thus the power amplifier will have a lesser linear range in SC-FDMA when compared with OFDMA
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Interference is avoided under frequency division multiplexing by the use of guard bands, which are unused portions of the frequency spectrum between subchannels. by abdullahi yusuf gedi
In CDMA all the stations can sends data simultaneously. But in FDMA only one channel occupies the entire bandwidth of the link so each channel can be assigned to only one user at a time. So CDMA is better than FDMA.
tdma and fdma
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There are 104 Army bands, 15 Marine bands, 13 Navy bands, 23 Air Force bands, 2 Coast Guard bands, and 1 Merchant Marine band. There are also military-style bands of civilians, such as the Grand Virginia Military Band.
There are 104 Army bands, 15 Marine bands, 13 Navy bands, 23 Air Force bands, 2 Coast Guard bands, and 1 Merchant Marine band. There are also military-style bands of civilians, such as the Grand Virginia Military Band.
The basic difference between fdm and fdma is that fdm is used in wired system where as fdma is used in wireless communication.
Guard bands between channels