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2. Single-carrier FDMA - Wikipedia

   en.wikipedia.org/wiki/Single-carrier_FDMA

   A related concept is the combination of a single carrier transmission with the single-carrier frequency-domain-equalization (SC-FDE) scheme. [10] The single carrier transmission, unlike SC-FDMA and OFDM, employs no IDFT or DFT at the transmitter, but introduces the cyclic prefix to transform the linear channel convolution into a circular one.

3. Frequency-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Frequency-division...

   Frequency-division multiple access (FDMA) is a channel access method used in some multiple-access protocols. FDMA allows multiple users to send data through a single communication channel, such as a coaxial cable or microwave beam, by dividing the bandwidth of the channel into separate non-overlapping frequency sub-channels and allocating each sub-channel to a separate user.

4. Channel access method - Wikipedia

   en.wikipedia.org/wiki/Channel_access_method

   An example of FDMA systems were the first-generation 1G cell-phone systems, where each phone call was assigned to a specific uplink frequency channel, and another downlink frequency channel. Each message signal (each phone call) is modulated on a specific carrier frequency .

5. Frequency-division multiplexing - Wikipedia

   en.wikipedia.org/wiki/Frequency-division...

   At the source end, for each frequency channel, an electronic oscillator generates a carrier signal, a steady oscillating waveform at a single frequency that serves to "carry" information. The carrier is much higher in frequency than the baseband signal. The carrier signal and the baseband signal are combined in a modulator circuit.

6. Time-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Time-division_multiple_access

   Most 2G cellular systems, with the notable exception of IS-95, are based on TDMA. GSM, D-AMPS, PDC, iDEN, and PHS are examples of TDMA cellular systems.. In the GSM system, the synchronization of the mobile phones is achieved by sending timing advance commands from the base station which instruct the mobile phone to transmit earlier and by how much.

7. Orthogonal frequency-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Orthogonal_frequency...

   Low-data-rate users can send continuously with low transmission power instead of using a "pulsed" high-power carrier. Constant delay, and shorter delay, can be achieved. OFDMA can also be described as a combination of frequency-domain and time-domain multiple access, where the resources are partitioned in the time–frequency space, and slots ...

8. LTE (telecommunication) - Wikipedia

   en.wikipedia.org/wiki/LTE_(telecommunication)

   Orthogonal frequency-division multiple access for the downlink, Single-carrier FDMA for the uplink to conserve power. Support for both FDD and TDD communication systems as well as half-duplex FDD with the same radio access technology. Support for all frequency bands currently used by IMT systems by ITU-R.

9. Single-carrier frequency-domain-equalization - Wikipedia

   en.wikipedia.org/?title=Single-carrier_frequency...

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