Advantages and Disadvantages of OFDM

ADVANTAGES:

1.Makes efficient use of the spectrum by allowing overlap.

2.By dividing the channel into narrowband flat fading subchannels, OFDM is more resistant

to frequency selective fading than single carrier systems are.

3.Eliminates ISI and IFI through use of a cyclic prefix.

4.Using adequate channel coding and interleaving one can recover symbols lost due to the

frequency selectivity of the channel.

5.Channel equalization becomes simpler than by using adaptive equalization techniques with

single carrier systems.

6.It is possible to use maximum likelihood decoding with reasonable complexity.

7.OFDM is computationally efficient by using FFT techniques to implement the modulation

and demodulation functions.

8.Is less sensitive to sample timing offsets than single carrier systems are.

9.Provides good protection against cochannel interference and impulsive parasitic noise.

DISADVANTAGES :

1.The OFDM signal has a noise like amplitude with a very large dynamic range, therefore it

requires RF power amplifiers with a high peak to average power ratio.

2.It is more sensitive to carrier frequency offset and drift than single carrier systems are due

to leakage of the DFT.

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About Md Shabbir Hasan

I am a B.Sc(hons) in Electronics and Communication Engineering gradauate.My institute's name is Institute of Science and Technology. I like surfing net. I like sharing knowledge regarding Science and technology etc..which interests me I have strong interest in IT, Software, Working as a Software Support Engineer in Foreign Consultancy firm named SLMS. I train , support and implement ERP system .

Posted on March 7, 2012, in Uncategorized. Bookmark the permalink. 1 Comment.

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