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.

Next Generation Cellular Network Planning

In this chapter, a multi-layer ATM architecture is proposed for the interconnection of current and future mobile communications nodes. Consisting of different ATM node types with respect to switching capability, the proposed architecture is adapted to current 2G and evolving 3G systems as well as future 4G wireless systems, as a common and shared backbone transmission network interconnecting core and access nodes between each other and Internet or PLMN/PSTN. Moreover, facing the huge expansion of transmission interconnection network that will support current and future generation mobile communications, a modification of the standard ATM cell structure is introduced in order to efficiently support user mobility functional procedures. The proposed ATM architecture is integrated over a suitable, with respect to region and capacity, physical interface, consisting of SDH or SONET for wide area topologies, wireless links for outdoor areas and LED-POF combination for indoor areas. Being an interesting alternative over copper or traditional fiber, POF characteristics and performance issues are analyzed.