complete literature survey

complete literature survey do complete literature review on OFDM FEC techniques used by various authors and their advantages and disadvantages considering Bit error rate (BER). Give more focus on how these techniques reduced the BER ratio. Represent graphically all authors, their OFDM FEC techniques, Protocol standards used and BER values. Also, mention the techniques which is best for underwater communication used by most of authors with less BER in conclusion. The paper format is much be elsevier format of literature survey within 3 pages in two columns. In the Very_imp_paper.pdf the complete review is done from OFDM origin till now so that must be added from start and end to present and current papers on underwater communication.