2Highlights Concept of OFDM with spectrum Digital modulation basics PrinciplesOFDM process with flow chartFrequency samplesSingle & multi carrier systemMultichannel systemsAdvantages & disadvantagesApplicationsConclusion
3What is OFDM? OFDM =>Orthogonal Frequency Division Multiplexing It is a process of splitting of higher data streams into a number of lower data streams simultaneously.
4OFDM DEFINITION OFDM = Orthogonal FDM Carrier centers are put on orthogonal frequenciesORTHOGONALITY - The peak of each signal coincides with trough of other signalsSubcarriers are spaced by 1/Ts
14OFDM Advantages Efficiently Deals With Channel Delay Spread Enhanced Channel CapacityEfficiently Deals With Multi-path FadingAdaptively Modifies Modulation DensityRobustness to Narrowband Interference
15OFDM Disadvantages OFDM Sensitive to Small Carrier Frequency Offsets OFDM ExhibitsHigh Peak to Average Power RatioHigh Frequency Phase NoiseSampling Clock Offsets
16Applications Digital Audio and Video Broadcasting Wireless Networking Power-line Technology
17CONCLUSION In simulation OFDM is used over an AWGN channel. In hardware comparison OFDM has lower potential.OFDM produces low hardware complexity.It is a suitable modulation technique for high performance wireless telecommunication.