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OFDMA Principles in LTE

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There are several ways to transmit over the frequency band and to share the resource between several devices.

What is TDMA,CDMA & FDMA ?

1.TDMA
• The users are separated by the the time
• Used by the GSM

2.CDMA
• The users are separated by the codes. They receive data at the same time at the same frequency.
• Used in the CDMAOne, CDMA2000 and WCDMA 

3.FDMA
• The users are separated by the frequency
• The 3G LTE used an improved FDMA called OFDMA

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