The Research Of Rake Receiving Technique In The CDMA Mobile Communications

With the rapid development of the communication technology in recent years, especially the wireless cellular mobile communication technology, the mobile users have been increased very rapidly. For example in China there were about 13 million users in 1997 but there were already 5 hundreds million users in 2005. The key factor of driving the mobile communication technology is the communication quality and the new service.Future wireless communication systems trend to provide multi-services to mobile users. CDMA technique is adopted by the 3rd generation mobile communication systems due to its flexibility in supporting multi-services.With the development of the communication technology, the spatial are more and more complicated and dense. It results in that output of the receiver doesn't contains only one signal .In mobile communication system,due to electronic wave is subject to the city building and terrain,it's bound to appear different route and time delay,namely,the channel of mobile correspondence is a various declined channels,it makes the received signal undulate and decline,this leads to affect the quality of correspond system.In CDMA system,Rake receive technique is a separable demodulation for every received signals,and putting output together to achieve the aim of enhancing the...