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In wireless communication system transmitted signals are subjected to multiple reflections, diffractions and attenuation caused by obstacles such as buildings and hills, etc. At the receiver end, multiple copies of the transmitted signal are received that arrive at clearly distinguishable time instants and are faded by signal cancellation. Rake receiver is a technique to combine these so called multi-paths by utilizing multiple correlation receivers allocated to those delay positions on which the significant energy arrives which achieves a significant improvement in the SNR of the output signal.
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