Efficient adaptive coding scheme in mobile satellite communication channel

The introduction of global mobile personal communications by satellite (GMP CS) systems makes it possible to provide high-quality services, especially by using low earth orbit (LEO) or medium earth orbit (MEO) satellites. In m obile satellite communication systems such as GMPCS systems, error correcti ng coding schemes are needed to achieve a desirable quality of service, and the coding scheme should be efficient in terms of the frequency spectrum a s well as the power. Efficient coding schemes which employ trellis decoding methods with Reed-Solomon (RS) codes are proposed. These schemes can be us ed adaptively in time-varying fading conditions of mobile satellite communi cation channels. Simulations have been performed using a mobile satellite c hannel model as well as using an additive white Gaussian noise (AWGN) chann el model. The results showed that the proposed schemes can achieve a better performance with less decoder complexity than a rate 1/2 constraint length 7 convolutional code in any fading environment.