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Study on the Implementation of RAKE Receiver in 4G System

The RAKE receiver has must been used in CDMA or 3G systems for its function to form the diversity reception of signals resulting from multi-path propagations. The basic condition for the implementation of RAKE receiver is that the spectrum spreading (SS) must be used in those systems. But that SS would not be existed in 4G system continuously, and OFDM and QAM would be used in that system instead. So the new method should be found to replace that SS code to separating those multi-path signals, making the RAKE receiver in 4G could be realized. This new method for the implementation of RAKE receiver in 4G System would be introduced in the paper, as well as the performance difference between those two kinds of Rake receiver.