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A rake receiver is a radio receiver designed to counter the effects of multipath fading. It does this by using several "sub-receivers" each delayed slightly in order to tune in to the individual multipath components. Each component is decoded independently, but at a later stage combined in order to make the most use of the different transmission characteristics of each transmission path. This could very well result in higher SNR (or Eb/No) in a multipath environment than in a "clean" environment
The ppl have discussed the merits of RAKE receiver
but its not always advantagous. Actually, this increase in SNR advantage comes at a price of increased complexity and hence cost of the receiver
Also, the major problem with RAKE receivers is that the number of multipath components are unlimited (virtually). But RAKE receiver can only utilize only a few of them due to almost exponential increase in complexity at increased no of multipath components