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Currently many countries are focusing on its water treaty not only from strategic point of view but also to unearth oceans mystery. The underwater communication, communicating between two water submerged bodies, becomes a very useful tool for this purpose. In underwater communication we are using acoustic signals, because if we use electromagnetic waves then signal attenuation and power degradation will increase with respect to acoustic waves. The underwater communication faces lots of problem due to delay spread, large Doppler shift, low coherence bandwidth and time varying channel etc. It results not only lowering the data rate but also increases the receiver complexity. For compensating all these problems many techniques have been proposed. Time Reversal Mirror (TRM) based techniques have recently gained attention due to its promising properties: spatial and temporal focusing. In general, the frequency selective behavior of underwater channel is converted to flat fading behavior with the application of Orthogonal Frequency Division Multiplexing scheme (OFDM). It has been shown that OFDM along with TRM enhances the performance of an underwater system by increasing the coherence bandwidth and thereby decreasing the delay spread. It can be shown that the TRM makes the OFDM channel real, which simplifies the channel estimation and thereby reduces the receiver complexity without effecting the performance. When the real channel only affects the magnitude not the phase, so the phase compensation is not required. Hence we can easily compensate the effect of channel with the help of less parameters, so the complexity of the receiver is reduced. The simulation results and tank trails validates the above claim.
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