Advantages and Disadvantages of OFDM
- Makes efficient use of the spectrum by allowing overlap.
- By dividing the channel into narrowband flat fading subchannels, OFDM is more resistant
to frequency selective fading than single carrier systems are.
- Eliminates ISI and IFI through use of a cyclic prefix.
- Using adequate channel coding and interleaving one can recover symbols lost due to the
frequency selectivity of the channel.
- Channel equalization becomes simpler than by using adaptive equalization techniques with
- It is possible to use maximum likelihood decoding with reasonable complexity.
- OFDM is computationally efficient by using FFT techniques to implement the modulation
and demodulation functions.
- Is less sensitive to sample timing offsets than single carrier systems are.
- Provides good protection against cochannel interference and impulsive parasitic noise.
- 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.
- It is more sensitive to carrier frequency offset and drift than single carrier systems are due