1. OFDM Prepared By : Jassim Al-Bazron Jassim Al-Bazron AbdulMohsen Albeshr Mohammed Al-Eid Mohammed Al-Eid For: Dr Marwan Abu-Amara

2. Agenda  Definition  How it works  Uses

3. Definition  Orthogonal Frequency Division Multiplexing, an FDM modulation technique for transmitting large amounts of digital data over a radio wave. FDMmodulationFDMmodulation  OFDM reduces the amount of crosstalk in signal transmissions. 802.11a WLAN, 802.16 and WiMAX technologies use OFDM. crosstalk802.11aWLANcrosstalk802.11aWLAN

4. HOW OFDM WORKS?  OFDM works by splitting the radio signal into multiple smaller sub- signals that are then transmitted simultaneously at different frequencies to the receiver.

5. HOW OFDM WORKS?  Parallel Data Streams  Data Encoding is based on Amplitude Modulation  Multiple Carriers are combined through the Fourier Series Computed by Inverse Fast Fourier transformComputed by Inverse Fast Fourier transform

7. Uses of OFDM  ADSL  Powerline Technology  Wireless local area networks  Terrestrial digital radio and television broadcasting  Digital radio