The Implementation And Study Of The Rake Receiver Technology In Cdma Systems

In mobile communication system,due to electronic wave is subject to the city building and terrain,its bound to appear different route and time delay,it makes the received signal undulate and decline,this leads to affect the quality of correspond system.Because of the complex circumstance and the continuous movement of mobile telephone,the received signals frequently come from many over lapped reflected wave,so form various route declined.Select and use concentrate technique is a very effective method against the various routes declined.CDMA mobile communication system adopts the Rake received technique that demodulates every routes signal separetely,and putting output together to achieve the aim of enhancing the effect of receiving.Like this,not only do it overcome the influence of various routes decline,but also it equal to it add up the power of signal(so to speak equaling to increase the launch power of signal).In CDMA mobile communication system,the various routes signals is not an un-favorable factor,but it becomes a beneficial one.First from the glitch of various routes transmitting of microwave,the article points out the measure to conquer route transmitting in CDMA mobile communication system—adopt "Rake" received technique.After this the article commends the principle of the Rake receiver,then focus on the pattern and achievement of Rake receiver of CDMA system.The article based on the introducing the relevant theories of the Rake receiver, details the actual practice activities through the construction of Tongchuan City CDMA network, further validated the Rake reception in CDMA mobile communication systems.Through this research, we can draw the following conclusions:in CDMA mobile communication systems, Rake receiver technology can improve reception; in CDMA mobile communication systems, anti-multipath interference performance improves with an increase in the number of Rake receiver searchers and demodulators in use.