Abstract

The third general mobile system (3G)'s purpose supports many kinds of services for everyone at anytime and anywhere. These include such as: high speed data transmission, figure data and multimedia service up to 2Mbps beside traditional voice service. With data rate up to 2Mbps, it is very necessary and important to enhance the transmission, line reliability in 3G. Channel coding is often used in digital mobile system in order to protect the information bits against interference and reduce the number of error bits. A code with Shannon limit performance is ideal, but so far, has not been achieved in practical. The only practical code that comes close to the Shannon limit is RSC Turbo code (Recursive Systematic Encoder). The excellent performance funtion of Turbo code achieve near Shannon limit in case the large frame size on the AWGN channel (Additive White Gaussian Noise). According to IMT-2000 specification, Turbo code is accepted as a channel coding method for large frame data services by 3GPP(W-CDMA) and 3GPP2 (cdma2000).